Kc Casf System: Complete Technical Guide

The CASF system is the four-oxide phase diagram on which the entire clinker burning is drawn: calcium oxide, aluminium oxide, silicon dioxide and iron oxide, the four majors of module 2.1, arranged into the phase equilibrium map that decides when the melt appears, how much melt exists at 1,450 degrees, and which crystals grow from it: the module 2.2 teaches the reading of this map: the liquid phase is the working fluid of the sintering zone, and the CASF system is the map of that fluid: every number of the burning process, from the 1,338 degree eutectic to the 25 percent liquid at the flame, lives on this map.

The Complete Cement Technical Package (931 files including the books, the courses, the Excel tools and the presentations: $249.99 one-time: instant download via the PayPal payment) includes this course module with the phase diagram plates, the melt calculation tools and the ternary sections: the same package that carries the cement chemistry of Taylor, the kiln process files and the raw mix design tools: this article walks the module: the reader who finishes it can trace the burning behaviour of any raw mix to the geometry of the phase map, and can explain why the flux additions of module 2.10 work.

The style of the module is the style of the course: the numbers first, the mechanisms second, the plant practice third: the CASF system is a large field of the ceramic science, and the module selects exactly the parts that the cement kiln uses: the clinker liquid, its temperature of appearance, its quantity and its composition: the sections proceed from the definitions through the ternary maps, the invariant points, the melt quantity calculation and the minor component shifts, closing with the practical reading of the plant clinker on the map.

1. The Four-Component Frame: Why the Clinker System Is Not a Simple Binary

The cement clinker is not melted like a metal alloy: it is sintered, which means that a fraction of the charge melts and the rest dissolves in that melt: the phase equilibrium of the four major oxides decides all the important numbers, and the module opens by fixing the frame:

• The components: CaO, SiO2, Al2O3 and Fe2O3 together form over 95 percent of the clinker mass, and the phase behaviour of the clinker is the phase behaviour of this four-component system, the CASF of the course title;
• The phase rule count: with four components, the system is represented in a tetrahedron, and its practical reading is done through the two-dimensional sections and the projections that the cement chemists developed over a century of the study;
• The clinker composition point: the typical OPC clinker of module 2.1, with 66 percent CaO, 22 percent SiO2, 5 percent Al2O3 and 3 percent Fe2O3, is one point inside the tetrahedron, and the phase diagram tells what the point sees at each temperature;
• The equilibrium limit: the real kiln never reaches the full equilibrium, but the equilibrium map is still the best map: the deviations of the real clinker from the equilibrium predictions are the subject of module 2.5, and the map of module 2.2 is the reference from which the deviations are measured;
• The practical value: the map explains the daily observations of the plant: why the iron-rich mixes melt more, why the high-lime mixes need the hotter zone, why the sulfate and the fluoride of module 2.10 lower the temperature: all are phase map effects;

The four-component frame is the largest map that the course uses, and the module deliberately teaches it as the frame rather than as the laboratory curiosity: the plant that reads the frame reads its own kiln, because every flame in the world melts the same system of the four oxides.

2. The Ternary Building Blocks: The C3S–C2S–C3A and the Ferrite Planes

The full quaternary system is built from the ternary subsystems, and the module teaches the two planes that contain the practical clinker compositions:

• The lime-silica-alumina plane: the ternary system CaO–SiO2–Al2O3 contains the phases C3S, C2S, C3A and the liquid compositions that form them: the key eutectic of this plane, between C3S, C2S and C3A, lies at about 1,455 degrees in the pure ternary, and this is the classical temperature quoted as the clinkering point of the chemistry;
• The lime-silica-ferrite plane: the ternary CaO–SiO2–Fe2O3 carries the ferrite and the brownmillerite chemistry: the C4AF phase and its solid solution series sit here, and the eutectics of this plane lie lower than the alumina plane, near 1,250 to 1,300 degrees;
• The quaternary combination: when the four oxides act together, the invariant points of the full system lie below the ternary values: the classical quaternary eutectic near 1,338 to 1,350 degrees is the temperature at which the first melt of the practical clinker mix appears;
• The subsolidus triangles: below the first melting, the solid phases coexist in the definite associations: the clinker composition sits inside the triangle C3S–C2S–C3A in the pure ternary, which is why the ordinary clinker is exactly the assemblage of these three phases plus the ferrite;
• The microscope tie: the tie lines and the triangles of the ternary maps predict which phases can coexist: the alite and the free lime, the belite and the aluminate, all the pairs that the clinker microscopy of the plant confirms in the polished sections;

The ternary planes are the reading primer of the module: the engineer who can place the raw mix on the ternary map and draw the nearest invariant points can predict the melting behaviour of the mix before the kiln ever sees it: the module provides the printed plates with the worked placements for the standard clinkers.

3. The First Melt: The Eutectics and the Temperature of the Sintering Start

The single most important number of the CASF system for the plant is the temperature at which the first liquid appears, because the liquid is the reagent of the alite formation:

The table is the temperature spine of the burning process: the ordinary clinker mix begins to wet its grains near 1,340 degrees, the well-fluxed mixes earlier, and the pure, iron-free chemistry later: the plant that needs the lower temperature either enriches the flux or accepts the mineralized additions: the eutectic numbers convert the chemistry decision into the degrees of the flame setting.

4. The Clinker Liquid Phase: Composition, Quantity and the Dissolving Power

Once the first melt appears, the clinkering runs through the liquid: the module devotes this section to the properties of the melt that the plant can measure and steer:

• The melt quantity: at 1,400 to 1,450 degrees the ordinary OPC mix holds about 20 to 30 percent of its mass as the liquid, and the number rises with the iron and the alumina content: the empirical relations of the literature, such as the classical formula of the liquid content, give about 3 percent liquid per percent of Al2O3 plus 2 percent per percent of Fe2O3 in the practical clinker range;
• The melt composition: the liquid is a calcium-rich aluminosilicate melt with the iron: the typical analysis of the clinker liquid at 1,450 degrees is near 55 to 60 percent CaO, 20 to 25 percent Al2O3, 10 to 15 percent Fe2O3 and 5 to 8 percent SiO2, with the minor oxides dissolved in proportion;
• The dissolving sequence: the melt dissolves the belite and the free lime first, then precipitates the alite as the supersaturation builds: the driving force of the whole operation is the solubility of the lime in the melt, and the temperature is the knob that controls it;
• The viscosity: the clinker melt viscosity at 1,450 degrees is of the order of 0.2 to 0.5 Pa·s, low enough to wet the grains but high enough to hold the clinker nodule structure: the module 2.10 details how the fluxes alter this property;
• The surface tension: the melt surface tension near 500 to 600 millinewtons per metre drives the nodulization of the clinker: the balanced surface forces form the nodules of 5 to 30 millimetres that the cooler receives;

The liquid phase is the working fluid of the sintering zone, and this section is the reference of every later mention of the melt in the course: the module 2.3 uses the melt to explain the lime saturation limits, and the module 2.10 uses it to explain the mineralisers: the plant reads the melt quantity from its own chemistry, and the numbers of this section are its yardstick.

5. The Phases of the System: From the Alite to the Ferrite Series

The CASF system hosts the four main phases of the clinker plus the transient phases that the kiln chemistry passes through, and the module lists them with the phase map identities:

The table carries the map positions of the phases: the alite is a high-temperature near-lime phase, which is why it needs the hot zone; the belite is the stable silicate across the whole kiln range, which is why the slow cooling leaves it behind; and the ferrite is not a fixed compound but a solid solution series that absorbs the iron, the aluminium and the minor oxides in flexible proportions: the phase map explains the behaviour of each phase in the plant.

6. The Ferrite Series: The Aluminium-for-Iron Exchange of the System

The ferrite phase is the most compositionally flexible of the clinker phases, and the CASF system teaches why:

• The solid solution range: the ferrite of the clinker is not the pure C4AF but a member of the solid solution series between 2CaO·Fe2O3 (C2F) and 6CaO·2Al2O3·Fe2O3 (C6A2F): the practical clinker ferrite approaches the C4AF end member but varies with the A/F ratio of the mix;
• The AR (alumina ratio) control: the alumina ratio of module 2.1 decides where the ferrite sits in the series: the high-AR mixes carry the alumina-rich ferrites with the more aluminate phase, the low-AR mixes the iron-rich ferrites with the more C4AF, and the whole balance is the AR story of the raw mix design;
• The flux consequence: the ferrite is the strongest fluxing phase of the four: the iron oxide additions dissolve into the melt earlier than the alumina, which is why the iron adjustment is the classic lever of the burnability: the plants raise the Fe2O3 by 0.5 to 1.0 percent to soften a hard-burning mix;
• The colour and the reactivity: the iron-rich clinker is darker and its cement hydrates with the higher early heat release, while the low-iron (white) clinker burns hotter and carries the near-aluminate-only flux system: the white cement process is the extreme end of the AR scale;
• The microscopy signature: the ferrite appears in the polished section as the interstitial phase filling the spaces between the alite crystals, its light-brown to grey colour distinct from the aluminate: the microscopy of module 2.5 uses the ferrite morphology to judge the cooling and the fluxing of the clinker;

The ferrite series is the phase-map explanation of the AR modulus: the raw mix design of the plant, which tunes the alumina ratio between 1.3 and 1.7, is in the phase map language a movement along the ferrite solid solution: the module teaches both languages side by side.

7. The Minor Components on the Map: How MgO, Alkalis and SO3 Move the Boundaries

The real clinker is never the pure four-oxide system, and the CASF map shifts under the influence of the minor components of module 2.1: the module quantifies the shifts:

• The magnesia: the MgO up to about 2 percent enters the liquid and lowers its viscosity and the melting start by 10 to 20 degrees; beyond the saturation limit the magnesia precipitates as the periclase, and the free periclase of the clinker is the expansion risk of the concrete;
• The alkalis: the Na2O and the K2O modify the melt in the direction of the alkali-bearing phases: the alkali sulfates form their own low-melting eutectics near 884 to 1,070 degrees, and the alkalis also stabilize the belite and the aluminate at the expense of the alite when they exceed the sulfate binding capacity;
• The sulfate: the SO3 expands the liquid field and lowers the invariant temperatures, which is the mineralizing action of the sulfur read on the phase map: the same sulfate that circulates through the preheater of module 2.6 is the flux of the map;
• The chloride: the chlorine forms the very low-melting alkali chlorides that melt near 800 degrees: this is why the chloride is such a strong build-up former in the cool parts of the preheater, and why the plants limit it so severely in the feed;
• The phosphorus and the titanium: the P2O5 and the TiO2 enter the solid solutions and move the phase boundaries in the direction of the belite stabilization and the ferrite enrichment: the module 2.10 treats their fluxing and poisoning effects in detail;

The minor components bend the map, and the module insists that the plant read its XRF as the phase-map input: the 1.0 percent alkali clinker does not behave like the 0.1 percent alkali clinker at the same LSF, and the map explains the difference in the language of the shifted phase boundaries.

8. The Melt Quantity Calculation: The Working Numbers of the Sintering

The plant needs the numbers, and the module delivers the classical estimation of the liquid quantity from the oxide analysis:

• The empirical base: the widely used correlations estimate the liquid fraction of the clinker at 1,400 to 1,450 degrees from the Al2O3 and the Fe2O3 contents, with the typical relations of about 3 percent liquid per percent Al2O3 and 2 percent per percent Fe2O3, plus the corrections for the MgO and the alkalis;
• The worked example: a clinker with 5.0 percent Al2O3 and 3.0 percent Fe2O3 returns about 15 percent liquid from the alumina plus 6 percent from the iron, about 21 percent at the reference temperature, within the 20 to 30 percent band of the industry practice;
• The high-flux example: a mix with 6.0 percent Al2O3 and 4.0 percent Fe2O3 returns about 18 plus 8, about 26 percent liquid: the two percentage points of the flux raised the melt fraction by a quarter, and the kiln burns visibly softer;
• The temperature dependence: the liquid fraction grows steeply with the temperature above the first melt: the module presents the correction curves, which add roughly 0.5 to 1.5 percent liquid per 10 degrees in the 1,400 to 1,450 range;
• The control use: the liquid estimate is a weekly control calculation of the plant: the quality engineer enters the clinker oxide analysis and the target liquid band of 20 to 28 percent, and the out-of-band values send the mix design back to the raw mill;

The melt quantity numbers are the practical output of the CASF map: the plant that steers its liquid fraction steers the burnability, the coating stability and the alite formation, and the module provides the calculation template that turns the phase map into the daily control sheet.

9. From the Map to the Plant: The Burnability Reading of the Mix

The module closes the theoretical loop by connecting the phase map to the burnability judgements that the plant makes every day:

• The easy-burning mix: the composition near the low-melting fields, with the AR near 1.3 and the liquid fraction above 24 percent, forms the melt early, wets the grains completely and finishes the alite at 1,400 to 1,420 degrees: the plant burns such mixes with the moderate flame and the stable coating;
• The hard-burning mix: the high-LSF, high-SR composition with the liquid fraction near 18 percent and the high-AR alumina must wait for the hotter zone: the free lime persists, the operator raises the flame, and the NOx and the brick wear follow: the map explains why the mix is hard before the kiln proves it;
• The correction levers: the raw mix corrections of the plant are the map movements: the iron addition moves the composition toward the ferrite flux, the alumina reduction raises the liquid start, the LSF reduction moves the composition away from the lime corner: each correction is a directed step on the map;
• The trial feed design: the plant designing a new mix runs the laboratory burnability test of the candidate compositions and compares the free lime curves with the melt quantity estimates: the two sets of numbers together choose the final recipe;
• The coating and the rings: the liquid phase is also the builder of the coating and the rings: the coating of the burning zone is the frozen melt layer, and its stability depends on the melt quantity and the composition of the mix: the plants with the extreme liquid fractions fight the ring formation in the transition zone;

The plant reading is the destination of the module: the CASF map is not a museum plate but the working tool of the mix design, the flame setting and the coating control: the engineer who reads the mix on the map anticipates the kiln behaviour that the operator otherwise learns by the trial of the weeks.

10. The Equilibrium Limits of the Map: The Real Kiln Versus the Ideal System

An honest module states the limits of its own instrument: the phase map is an equilibrium construction, and the kiln is a flow reactor with the finite residence time:

• The residence time: the material spends roughly 20 to 40 minutes in the kiln, of which only 5 to 15 minutes in the sintering zone, while the equilibrium phases need the time to form: the incomplete reactions are the norm, and the free lime of 1 to 2 percent at the kiln exit is the accepted residue;
• The thermal gradients: the charge is not at one temperature: the surface of the nodules sees the flame side temperatures near 1,500, the core stays hundreds of degrees cooler, and the phase progress varies through the nodule: the map describes the average, the nodule lives the gradient;
• The melt homogenization limit: the kiln rotation mixes the charge only partially: the microscopic inhomogeneities of the mix survive into the clinker, and the localized lime pockets burn later than the average: the homogenization silo and the raw mill fineness are the plant answers to this limit;
• The cooling path: the equilibrium map of the high temperatures does not apply during the rapid cooling: the melt solidifies into the fine interstitial phases and the glass, and the module 2.7 explains how the cooling path freezes the polymorphs;
• The use of the map despite the limits: the phase map remains the reference because the deviations from it are systematic and teachable: the module 2.5 of the course measures those deviations, and the map of module 2.2 is the grid on which the measurement is drawn;

The equilibrium limits are not the weaknesses of the module but its honesty: the plant that knows where the map applies and where it does not reads both the map and the deviations, and that double reading is the professional practice that the whole course part two teaches.

11. The CASF Tools of the Package: The Plates, the Calculator and the Ternary Plots

The theoretical sections of the module are paired with the working instruments of the Complete Cement Technical Package:

• The phase diagram plates: the high-resolution plates of the ternary systems CaO–SiO2–Al2O3 and CaO–SiO2–Fe2O3, with the invariant point tables and the subsolidus triangles drawn for the clinker field;
• The melt calculator: the Excel tool that converts the clinker oxide analysis into the estimated liquid fraction at the chosen temperature, with the Al2O3, Fe2O3, MgO and alkali terms and the graphical output of the trend;
• The ternary plot templates: the empty ternary grids for the plant to plot its own mixes, with the clinker field and the phase triangles pre-drawn: the raw mix meetings of the plant plot the monthly averages on these grids;
• The burnability workbook: the combined sheet of the melt quantity and the laboratory free lime data, the tool that turns the phase map reading into the quantitative mix design decisions;
• The training slides: the presentation of the CASF system for the plant training sessions, with the animated progress of the clinker composition through the map during the burning;

The tools complete the module: the plate teaches, the calculator computes and the workbook decides: the reader of the module part two leaves with both the understanding and the instruments, the combination that the Complete Cement Technical Package delivers for every subject of its 931 files.

12. The Clinker Field on the Ternary Maps: The Composition Window of the Industry

The phase maps of the CASF system explain why the world’s Portland clinkers all sit inside a surprisingly narrow composition window: the module draws the window and the forces that keep it closed:

• The alite field boundary: the lime content of the mix must stay below the lime corner boundary of the alite field, because beyond it the free lime appears: the LSF range of 92 to 98 of module 2.1 is exactly the projection of this boundary onto the oxide language;
• The flux minimum: the total of Al2O3 plus Fe2O3 must stay above about 7 percent of the clinker, otherwise the melt quantity at 1,450 degrees falls below the 18 to 20 percent minimum and the alite formation starves: the silica ratio above 2.6 to 2.8 walks the mix out of the window;
• The ferrite-aluminate balance: the AR between about 1.0 and 2.0 keeps the clinker inside the field where the C3A and the C4AF coexist with the silicates: outside this band the phase balance shifts to the extreme aluminate or the extreme ferrite chemistries of the special cements;
• The global constancy: the clinkers of the world, from the European gray to the North American high-sulfur to the Middle Eastern high-alkali, all plot within a few percent of the same composition point on the maps: the phase diagram explains the convergence: the phases that make the strong, workable cement only form in this window;
• The deviation reading: when a raw mix falls outside the window, the map predicts the symptom: too much lime, the free lime; too little flux, the hard burn; too high AR, the flash-set aluminate cement: the module trains the reader to diagnose the mix by the map position before the kiln reports the trouble;

The composition window is the practical conclusion of the whole map geometry: the cement industry converged on the CASF field not by convention but by the thermodynamics: the window is the trade region where the alite forms, the melt is sufficient and the cement hydrates correctly, and the module closes the map section with this constraint made explicit.

13. The Sintering Mechanism: Dissolution and Precipitation in the Melt

The map shows the phases and the temperatures, but the plant also needs the mechanism of the sintering, and the module describes the sequence that the melt performs in the burning zone:

1. The wetting stage: as the first liquid appears near 1,340 degrees, it wets the grain surfaces and begins to pull the charge into the nodules: the capillary forces of the melt arrange the solids into the granular clinker structure;
2. The dissolution stage: the liquid dissolves the belite and the lime from the surfaces of the solid particles: the dissolution rate depends on the temperature, the melt viscosity and the particle size, and the coarse quartz and the coarse lime of a poorly ground feed survive into this stage;
3. The supersaturation stage: the melt becomes supersaturated in the lime and the silica as the temperature peaks near 1,400 to 1,450: the alite now nucleates at the liquid-solid interfaces, preferentially on the surfaces of the dissolving belite grains;
4. The crystal growth stage: the alite crystals grow at the expense of the dissolved belite and lime until the melt composition falls back toward the saturation: the alite size and the shape record the growth conditions, the large hexagonal tablets of the slow, fluxy burns versus the small, rounded crystals of the fast hot burns;
5. The solidification stage: during the cooling, the remaining melt solidifies as the interstitial aluminate, the ferrite and the glass: the cooling rate decides the crystallization fineness, and the module 2.7 describes how this stage freezes the reactive polymorphs;

The mechanism sequence is the process inside the map: the phases of the CASF system are the players, and the sintering sequence is the play: the plant that understands the dissolution and the precipitation stages understands why the residence time, the temperature and the flux content all matter, and why the three must be balanced together in the operation of the burning zone.

14. The Cooling Path: Crystallization of the Melt in the Cooler

The CASF system applies in reverse as the clinker descends into the cooler, and the module teaches the cooling crystallisation because the properties of the finished clinker are fixed on this path:

• The melt solidification: as the clinker cools from 1,450 to about 1,250 degrees, the melt crystallizes progressively: the aluminate and the ferrite are the first to separate, filling the spaces between the alite crystals, and the last fractions of the melt solidify near 1,300 degrees into the fine interstitial mixture;
• The fast cooling benefit: the rapid cooling below 1,250 degrees freezes the remaining melt into the fine crystals and the glass instead of the large, slow crystals: the finely crystallized clinker grinds easier and hydrates faster, and the plants measure the effect in the finish mill power and the early strength;
• The alite preservation: the slow cooling through 1,250 degrees lets the alite decompose into the belite and the lime in a limited but measurable degree, and lets the belite convert to the inert gamma polymorph: the cooler of the modern plant is designed to pass this temperature window quickly, the subject of the module 2.7;
• The periclase and the C3A crystallization: the cooling path also decides the crystal size of the periclase and the aluminate: the slow-cooled clinkers carry the coarse periclase that expands in the concrete, and the crystalline C3A that demands the higher gypsum in the finish mill;
• The plant practice: the cooler operation is the mirror of the map: the plants with the unstable cooler read the product symptoms, the glassy and the soft clinker versus the hard and the dusty, and the module advises the operators to treat the cooler as the chemical reactor it is, because the phase map of module 2.2 runs down the whole length of the cooling path;

The cooling section completes the round trip of the map: the CASF system governs the charge from the first melt of the sintering zone to the frozen microstructure of the cooler exit, and the reader of the module sees the plant as one continuous phase path: the kiln burns the map upward and the cooler freezes it downward, and the quality of the clinker is decided on both legs of the journey.

15. The Frequently Asked Questions

Why is the first melt of the clinker called the eutectic, and what does 1,338 degrees mean?

The eutectic is the composition at which the several phases melt simultaneously at the single lowest temperature of the region: the practical clinker eutectic near 1,338 to 1,350 degrees is the temperature at which the C3S, the C2S, the C3A and the ferrite-influenced liquid coexist: below this temperature the mix is fully solid, above it the liquid appears and grows: the 1,338 degree number is the door of the sintering.

Does the clinker reach the equilibrium of the phase map during the burning?

Never fully: the kiln is a flow reactor with the minutes of residence, and the phase map describes the state that the chemistry would reach with the infinite time: the real clinker carries the free lime, the glassy phases and the zoned crystals: the map is the reference grid, and the deviations of module 2.5 are measured from it.

How much liquid is too little, and how much is too much, for the stable burning?

The practical band of the industry is about 20 to 28 percent liquid at 1,400 to 1,450 degrees: below 18 percent the alite formation slows and the free lime climbs; above 30 percent the charge becomes sticky, the kiln coating grows heavy, the rings form in the transition zone, and the clinker balls agglomerate: the plants control the band through the AR and the Fe2O3 of the mix.

Why does the iron oxide soften the mix while the alumina does not do it as strongly?

The iron enters the melt earlier and in the larger proportion: the empirical liquid relations credit about 3 percent liquid per percent of Al2O3 and 2 percent per percent of Fe2O3, but the iron oxide also lowers the melting start and the melt viscosity more effectively: the iron is the strongest natural flux of the clinker system, and the low-iron white cement is the proof, burning visibly hotter than the gray.

Can the plant use the phase map to predict the coating stability of the kiln?

In a qualified way, yes: the coating is the frozen melt layer on the brick, and its formation depends on the melt quantity and the melt temperature of the mix: the plants with the stable, moderate liquid fractions near 22 to 26 percent report the more stable coatings, while the extremely fluxy mixes build the thick, sliding coatings and the extremely dry mixes leave the brick bare: the map explains the tendency, the operator tunes the flame.

The Bogue calculation also predicts the phases: how does it relate to the phase map?

The Bogue calculation of module 2.4 is the algebraic shadow of the phase map: it assumes that the clinker reaches the equilibrium assemblages of the subsolidus triangles and allocates the oxides to the phases by the fixed formulas: the map is the geometry, the Bogue is the arithmetic, and both are corrected by the real microstructure in module 2.5.

16. Conclusion

The CASF system has given the course its central map: the four oxides arranged into the phase equilibrium that decides the melting start, the melt quantity, the phase sequence and the burnability of every mix: the numbers of the module, from the 1,338 degree eutectic through the 20 to 28 percent liquid band to the ferrite solid solution, are the working figures of the sintering zone, and the reader carries them into the modules that follow: the lime saturation of module 2.3 explains the lime corner, the Bogue modules 2.4 and 2.5 arithmetic the phases, and the modules 2.6 to 2.10 bend the map with the minor components and the fluxes.

The Complete Cement Technical Package includes this course with the phase diagram plates, the melt calculator and the ternary plot tools: the one-time 249.99: the instant download: the map of the clinker is the map of the plant, and the reader of module 2.2 now holds it: the liquid phase, the eutectics, the ferrite series: the clinkering, drawn and numbered.

The module closes with the summary that the plant should remember in one breath: the first melt near 1,340 degrees, the liquid band of 20 to 28 percent, the flux balance of the AR, and the composition window of the industry: the CASF system is the grid on which the rest of the course part two is drawn, and the reader who has walked the grid owns the geometry of the clinkering before the arithmetic of the following modules begins.

The reading plan for the engineer: return to this module whenever the kiln behaves against the expectation, because the majority of the burning surprises are phase map events: the unexpected free lime, the sticky charge, the ring in the transition zone, the hard nodule: all of them are the four oxides negotiating their equilibria in the melt, and the map of module 2.2 gives the language to describe the negotiation before the corrective action is chosen.

This file is part of the Complete Cement Technical Package (931 files) available from cementequipment.org. Respective rights holders; library copy for the licensed single user.