Cement Process Overview: Complete Technical Guide

The cement manufacturing process is one of the most thermally and mechanically demanding industrial flowsheets in heavy industry. Turning limestone, clay, shale and iron corrective materials into a fine grey powder that sets and hardens when mixed with water requires a carefully sequenced chain of unit operations: extraction, crushing, raw grinding, homogenization, pyroprocessing and finish grinding. For a process engineer, production manager or student, a solid command of how these stages connect — how the material moves, how the energy flows, and how each equipment step conditions the feed for the next — is the foundation on which every other plant discipline builds. This Process Overview is designed as a complete technical walkthrough of that integrated chain, explaining the purpose, the equipment, the chemistry and the control logic behind each step, and it is one of the training presentations included in the Complete Cement Technical Package available from cementequipment.org. Whether you are commissioning a greenfield plant, optimizing an existing line, or simply building your professional knowledge base, this overview gives you the structured mental model that experienced kiln and mill engineers carry in their heads every day. Below we break the process down into its logical building blocks, quantify the key flows, and connect the dots between the quarry and the loading terminal.

1. Why the Process Overview Matters: Thinking in Flows

Before looking at any single machine, an engineer must understand the cement plant as a system of coupled flows: a solid materials flow, a gas flow and an energy flow that run through the entire facility from tipping hoppers to silos. Raw material entering the plant at perhaps sixty percent moisture and metre-sized lumps leaves the finish mills as a powder with a specific surface above 350 m²/kg and less than one percent moisture. In between, roughly 1.55 to 1.65 tonnes of raw meal are consumed to produce a single tonne of clinker, and about 0.95 tonnes of additives and gypsum are ground with that clinker to reach one tonne of finished cement. These fixed stoichiometric relationships are the heart of everything a process engineer does, because every crusher, mill, preheater tower and cooler is sized around them.

Thinking in flows also means thinking in residence times. A particle of limestone spends minutes in the crusher, an hour in the raw mill, many hours in the blending silo, less than one minute inside the burning zone of the kiln, and then another hour in the finish mill before it finally leaves as cement. Each of these steps has its own time constant, its own response curve and its own failure modes, and the art of plant operation is keeping the whole chain in dynamic equilibrium. The overview below reproduces the logic of the original training material: start with what enters, then follow it stage by stage, always keeping the question “what does the next step need?” in mind.

2. The Two Main Process Routes: Dry versus Wet

Historically the cement industry developed several distinct process routes, and choosing between them depends on the moisture of the available raw materials, fuel costs and regional practice. The two dominant routes are the dry process and the wet process, with the semi-dry and semi-wet variants occupying the middle ground.

Process route	Raw meal state entering hot zone	Moisture to evaporate	Typical heat consumption (GJ/t clinker)	Typical kiln feed
Wet process	Slurry with 30–40% water	Very high, all water evaporated	5.5–6.5	Long wet kilns with chains
Semi-wet	Filter cake, 18–22% water	High	4.5–5.5	Long kiln with conditioning
Semi-dry	Nodules, 12–14% water, preheater	Moderate	3.6–4.2	Grate preheater kiln (Lepol)
Dry process (modern)	Dry powder, less than 1% moisture	Minimal, only free moisture	2.9–3.6 (5-stage calciner ~3.0)	Multi-stage cyclone preheater and precalciner

The modern dry process with a suspension preheater and precalciner is the overwhelming standard in new plants because it cuts both fuel consumption and plant footprint. The wet process survives where raw materials are naturally very wet or where plants were built before the energy crises; its grinding is easiest because the slurry is easy to homogenize, but its fuel bill is punishing. When you study the Process Overview presentation you see the dry route treated as the baseline, with the wet and semi-dry routes explained as the historical alternatives that shaped existing plant fleets around the world.

3. The Starting Point: Raw Materials and Their Chemistry

Cement chemistry is dominated by four oxides: calcium oxide (CaO), silica (SiO₂), alumina (Al₂O₃) and iron oxide (Fe₂O₃). The process exists to combine these oxides at high temperature into a clinker that contains the reactive phases alite (C₃S), belite (C₂S), aluminate (C₃A) and ferrite (C₄AF), and then to intergrind that clinker with gypsum to control setting.

Limestone and other high-calcium rocks provide most of the CaO and typically make up 75–80% of the raw mix. Clay, marl or shale provide silica and alumina, and iron-bearing materials such as iron ore, pyrite cinders or bauxite residue provide the Fe₂O₃ corrective. Gypsum and other sulfate sources enter later, at the cement grinding stage. The engineer’s job at this level is to keep the key ratios — the lime saturation factor (LSF), the silica ratio (SR) and the alumina ratio (AR) — inside their design windows, because these ratios control burnability, liquid phase quantity and the final phase distribution of the clinker. A typical LSF of 92–98%, a silica ratio of 2.3–2.8 and an alumina ratio of 1.3–1.7 describe a normally burning grey Portland raw mix.

Because natural quarries are never homogeneous, the raw material department is really a continuous sampling and correction exercise: X-ray fluorescence analysis hours after drilling, on crushed belts and at the raw mill feed are the nervous system that feeds the proportioning loops. The overview material stresses that quality control starts in the quarry and is not something performed only in the laboratory, because stones that vary wildly in chemistry cannot be rescued later by blending alone.

4. Quarrying and Primary Extraction

Extraction is the first physical act of the process and usually the most capital-intensive to secure licenses for. The quarry plan must match the long-term demand of the plant, typically defined as twenty to sixty years of reserves, and must address the geology of the deposit: overburden depth, bench heights, hardness of rock and variation of chemistry across the faces.

The principal extraction methods are blasting, ripping and mechanical excavation. Bench blasting uses drill patterns and emulsion or ANFO explosives to fragment the rock into sizes the primary crusher can accept, typically below about 0.8 to 1.2 metres. Ripping uses bulldozer rippers where the rock is too soft to justify blasting. Modern operations increasingly use surface miners and hydraulic excavators with trucks or continuous belt systems; the choice depends on hardness, abrasiveness, environmental sensitivity near settlements and the cost per tonne moved.

• Blast design: burden, spacing, stemming and delay timing are engineered to control fragmentation, fly rock, vibration and throw.
• Drilling: rotary or down-the-hole rigs; hole diameter from 80 to 150 mm typically.
• Loading: hydraulic or rope shovels matched to truck size for optimum cycles.
• Hauling: rigid-body trucks, or belt conveyors where haul gradients and distances favour fixed infrastructure.
• Fragmentation quality: the crusher throughput and manganese wear directly reflect how well the blast controlled top size.

Quarry quality control uses regular face sampling and online analysers on the belt, so that the stockpile system — multiple clay and limestone heaps — can be used to pre-blend early chemistry swings before they reach the raw mill.

5. Crushing: The First Size-Reduction Step

The crusher converts run-of-mine rock (up to a metre or more) into a product typically below 75–90 millimetres that a raw mill or pre-blending storage can handle. Crushing is inherently expensive in energy and wear metal, and the engineer’s goal is to do the minimum amount of size reduction required downstream, because every unnecessary fraction of a millimetre costs money.

The main crusher families used in cement are the jaw crusher, the gyratory crusher, the impact crusher and, for softer chalky materials, hammer and roll crushers. Jaw and gyratory crushers compress the rock between opposed surfaces and are chosen for very hard and abrasive limestone. Impact crushers, including horizontal shaft impactors and hammer mills, break stone by dynamic impact and give higher reduction ratios (up to 20:1 or more in single stage), which means fewer crushing stages, but they wear faster on abrasive feed. The choice is a trade-off between capital, energy, wear cost and product grading.

Crushing plants are usually designed as primary and (sometimes) secondary stages, with magnetic separators to remove tramp metal, metal detectors, surge bins between stages and weigh feeders to smooth the flow into downstream storage. Dust collection at crushers is mandatory under modern emission limits, and the latest designs integrate water sprays and bag filters to keep fugitive dust at the source.

6. Raw Material Storage, Pre-Blending and Proportioning

After crushing, the separate raw materials are stored and then combined in the correct proportions. Storage serves three purposes at once: it buffers the plant against crusher and quarry outages, it allows pre-blending to smooth composition swings, and it provides the surge capacity that lets the mill run continuously.

Pre-blending uses the principle of building a layered stockpile and then cutting it perpendicularly: the material is spread in thin horizontal layers, and the reclaiming bridge is designed to cut through all layers at once, so the extracted stream is already an average of everything stored. This simple mechanical trick reduces the standard deviation of the key oxides substantially before chemical homogenization even begins. Typical pre-blending homogenizing efficiencies range from 3:1 to 10:1 depending on the system design.

Proportioning is achieved with weigh feeders or weightbelt feeders under a set of bins: one bin for limestone, one for clay and one for the iron corrective, each controlled continuously by an online analyser or by frequent XRF samples. The controller adjusts the set points of the bins to hold LSF, SR and AR inside their windows, rejecting excursions before they enter the raw mill. This is the first closed chemistry loop of the plant and it runs on a fast time constant because the raw mill itself has only minutes of residence time.

7. Raw Meal Grinding and Drying

Raw meal grinding reduces the proportioned mix to a powder in which at least 85–90% passes 90 µm and typically over 95% passes 212 µm, maximising the surface area available for the solid-state reactions later in the kiln. The two candidate technologies are the ball mill (usually air-swept and in closed circuit with a separator) and the vertical roller mill (VRM), each with its own strengths and its own drying capability.

Because raw materials often arrive with four to fifteen percent moisture, the raw mill doubles as a drying machine: hot gases are drawn through the mill from the kiln system (or from an auxiliary hot gas generator) and evaporate the water while the material is being ground. The VRM is particularly attractive because it uses the same gas stream to dry, classify and convey, which is why it has become the dominant choice for modern raw grinding trains with dry-process kilns.

Grindability matters here as much as chemistry. The specific energy needed to make the target fineness depends on the work index of the stone, and brittle, grindable limestone grinds far more cheaply than tough, abrasive, high-silica marls. Mill production is measured in tonnes per hour at a defined residue, and mill audits by the plant team compare actual against planned production and power, chasing every kWh/t saved as a direct operating-cost win.

8. Homogenizing: The Blending Silo as the Last Chemistry Guardian

Even with good proportioning, the raw meal arriving at the silo carries short-term fluctuations in CaCO₃ and the other oxides. The homogenizing silo is the plant’s last line of defence before the kiln, and it must smooth the remaining variations to a level the kiln control system can absorb, typically reducing the standard deviation of the lime saturation from ±0.6–1.0 on the mill outlet to ±0.15–0.25 at the kiln feed.

The two fundamental silo types are the batch (or mixing) silo and the continuous silo. The continuous homogenizing silo aerates the stored meal from the bottom through porous pads or nozzles; the aeration has two effects: it fluidizes the powder so it flows out evenly, and it creates an in-mix that averages the ingredients. The best-known continuous design is the tangential (CF) silo, in which the aeration air is directed so that different zones operate in sequence, creating defined mixing patterns, while the central mixing tube and the tangential air nozzle system generate the required degree of blending.

Aeration air comes from blowers, and the design problem is how much air per tonne per minute is needed to reach a given homogenizing ratio. Because the aeration energy can reach several kWh per tonne of raw meal, the process engineer balances homogenizing efficiency against power cost. When a plant struggles with kiln feed variability, the first questions asked are always about the silo: is the bottom pad plugged, is the air flow adequate, are the air valves and sequence controls working, and is the silo level being maintained inside the recommended band.

9. The Suspension Preheater: Thermal Preparation of the Feed

The suspension preheater transfers heat from the kiln exit gas to the raw meal before the meal enters the kiln, so that by the time the feed reaches the rotary kiln it has already been dried, heated and largely calcined, that is, converted from calcium carbonate to calcium oxide. The dry process achieves this by suspending the fine particles in the hot gas stream inside a series of cyclone stages: each cyclone stage is one pair of a gas riser duct and a cyclone.

In a typical five-stage preheater, the raw meal is fed into the hottest returning gas at the top stage, is caught in the cyclone, drops into the cooler riser of the stage below, is re-suspended, re-caught, and so on down the tower. Each stage adds roughly 100–150 °C of meal temperature, so a five-stage tower brings the meal to roughly 830–870 °C at its outlet, at which point 90–95% of the calcination is already complete in a precalciner equipped system. The gas flows upward and the meal flows downward, making the preheater a counter-current heat exchanger with very short gas residence times, so heat transfer happens extremely efficiently.

The preheater’s companion is the calciner, a vessel between the bottom cyclones and the kiln inlet in which fuel is burned in a fluidized or suspension flow of meal and hot tertiary air. Burning up to 60% of the total fuel in the calciner means the kiln itself only has to do the clinkering (sintering) work, which increases specific output enormously and keeps the burning zone temperatures manageable. The exhaust gas leaves the tower at 280–360 °C carrying the heat that then goes to the raw mill for drying and to the clinker cooler recuperation air, an elegant cascade of energy reuse that characterises modern plants.

10. The Rotary Kiln: Where Clinker Is Made

The rotary kiln is the iconic machine of the cement process: a long, slightly inclined slowly rotating steel cylinder, lined with refractory, fed with preheated meal at the back end and fired with a flame at the front end. As the kiln rotates at roughly 3 to 4 revolutions per minute, the material is lifted by the lining and cascades down, moving downhill by gravity while the hot flame gases move counter-currently upward.

Inside the kiln the clinkerization sequence is:

1. Residual calcination (950–1100 °C): any remaining CaCO₃ decomposes to CaO and CO₂.
2. Formation of primary phases (1100–1300 °C): CaO begins reacting with silica, alumina and iron oxides to form C₂S (belite), C₃A and C₄AF.
3. Liquid phase formation (from about 1260 °C): the aluminates and ferrites melt into a flux that wets the belite.
4. Clinkering or sintering (1350–1450 °C): CaO dissolves into the liquid and reacts with belite to form alite, C₃S, the phase that gives Portland cement its early strength.
5. Cooling of the nodule as it exits the burning zone and moves through the cooler.

The burning zone is the crown of the process: flame shape, flame momentum, oxygen level, and kiln shell temperature all converge there. Kiln operators steer the process with a handful of signals — feed rate, fuel rate, kiln speed, secondary air temperature, burning zone temperature measured by pyrometer, NOx and O₂ at the preheater outlet, and free lime in the clinker — to keep the alite formation window stable. Any excursion, long residence time at too-low temperature, or low oxygen causes under-burning (high free lime) or over-burning, both of which degrade grindability, cement strength and refractories.

11. The Clinker Cooler: Fast, Controlled Quenching

Clinker leaves the kiln at 1300–1400 °C and must be cooled quickly to protect its quality and to allow handling and transport. The cooler performs three jobs in one: it quenches the clinker to preserve the alite and control the glass phase and the crystal size, it recovers the sensible heat of the clinker as preheated combustion air returned to the kiln and calciner (recuperation), and it reduces the temperature to a level where the downstream conveyor and grinding system can receive the clinker, typically at ambient plus 60–100 °C plus wind.

The workhorse of modern plants is the grate cooler, in which the clinker lies as a bed on a moving grate while air is blown upward through it from below. Cooling air is progressively pushed through the bed, beginning at the hot end where it becomes the recuperation air for the kiln and calciner and finishing as exhaust air that can be used in the coal mill or bag filters. Key performance indicators of a cooler include the air number or surplus air ratio, the heat recuperation efficiency (how many kilojoules per kilogram of clinker are returned to the pyroprocess) and the target clinker temperatures at cooler outlet, typically below 100 °C plus ambient for good grinding and conveyor protection.

Golden rules for cooler operation, as stressed in dedicated cooler training courses, are to maintain a stable, evenly spread clinker bed, to keep the reciprocating grate stroke and hydraulic pressure in the design window, to avoid air channelling through empty or thin zones, and to keep the last rows of the cooler supplying enough excess air to cool the fines. Fast cooling favours alite retention and avoids the transformation of belite, while slow cooling permits larger crystal growth and improves grindability at the price of some strength, so the cooler is actually a quality instrument, not merely a handling device.

12. Fuel Preparation: Coal, Petcoke and Alternative Fuels

The pyroprocess consumes large quantities of fuel, typically 3.0 to 3.6 GJ per tonne of clinker for a modern line. Coal and petroleum coke are the traditional fuels, prepared by crushing and drying in a coal mill to a fineness of typically 1–3% residue on 90 µm for pulverized firing. The coal moisture, ash content, volatile matter and grindability all feed into the kiln fuel system design, and the volatile content in particular shapes flame characteristics: low-volatile coals need finer grinding and hotter secondary air to ignite stably.

Alternative fuels — tyres, refuse-derived fuel, solid recovered fuel, plastics, solvents, meat-and-bone meal — are increasingly fired in precalciners and kilns because the high temperatures ensure complete combustion and the alkaline nature of the meal neutralizes acidic combustion gases. The process description must therefore include fuel flexibility as a design criterion, because the burner, the calciner gas distribution and the alkali-sulphur cycles all have to tolerate the chemistry that alternative fuels bring.

Fuel affects the process in two interlocking ways: through its calorific value and through its ash composition. Ash becomes part of the raw mix, so a constant ash content and ash chemistry must be accounted for in the proportioning, and large swings in fuel ash force compensating adjustments to the raw mix and can destabilize the kiln feed chemistry.

13. Mass and Energy Around the System: The Numbers You Must Know

A process engineer cannot operate without a quantitative skeleton of the plant. The following typical values, drawn from training material like this overview, are the ones everyone should be able to recite:

Stream	Typical specific value
Raw meal feed per tonne clinker	1.55–1.65 t (dry)
CO₂ released from calcination	about 0.50–0.54 t per tonne clinker
Process heat consumption (modern 5-stage + calciner)	about 3.0–3.3 GJ per tonne clinker
Electrical energy, total plant	90–120 kWh per tonne cement
Finish grinding share of electrical energy	about 35–40%
Gypsum and additives per tonne cement	0.03–0.06 t sulphate, plus limestone or slag
Preheater exhaust temperature	280–360 °C
Cooler clinker outlet temperature	ambient + 60–100 °C

These numbers allow a rapid sanity check of any plant. If the raw meal factor drifts far above 1.65, losses in preheater dust or by-pass are occurring. If finish grinding electricity climbs above its share, separator efficiency or ball charge optimization is needed. Every plant keeps its own heat balance spreadsheet, but the overview numbers above are the universal benchmarks that connect each unit operation to its neighbours.

14. Finish Grinding: Making Cement, Not Just Clinker

Cement is clinker plus additions, interground to a target fineness and particle size distribution. The finish mill receives cooled clinker, gypsum (or synthetic sulphate sources) and additions such as limestone, slag or fly ash, and grinds them in a ball mill or vertical roller mill in closed circuit with a high-efficiency separator that returns the oversize for further grinding while the fines are collected as product.

The fineness target — typically a Blaine specific surface of 3000–4000 cm²/g for ordinary Portland cement — sets the strength development, the water demand and the cement climate inside the mill. Mill outlet temperature is managed by internal water injection or mill ventilation because gypsum dehydration during grinding changes the setting behaviour of the cement; if the mill runs too hot, the gypsum converts to hemi-hydrate or anhydrite and loses its retarding function. Finish grinding also shapes the particle size distribution, and modern separators aim for a steep distribution curve that maximises strength at constant water demand.

Because finish grinding consumes roughly a third to two-fifths of all the electrical energy of the plant, it is the favourite target of energy-efficiency programs: grinding aid chemicals, pre-grinders such as roller presses or HPGRs, improved media grading and separator tuning routinely deliver 10–25% reductions in grinding power while holding quality.

15. Storage, Packing and Dispatch

Finished cement is stored in cement silos and then packed in bags or loaded in bulk into tankers and rail wagons for dispatch. Because cement is hygroscopic and reacts with moisture, storage must keep it dry and dated, and the silo must be designed to avoid central dead zones that let old cement stay too long. Inventory management matters commercially: packing and dispatching against sales orders, with weighbridges and automatic palletizers, is the last physical step and the first interface with the customer.

Quality assurance continues to the very last moment: samples are taken at the silo outlet, tested for fineness, setting time and compressive strength, and certificates accompany each dispatch. The process description ends where the product hands over to logistics, but the process thinking — hold quality inside the control window all the way through — is exactly what makes the rest of the flow meaningful.

16. Process Control and Automation in the Overview

Modern plants run on distributed control systems (DCS) with hundreds of analogue loops closed automatically: feeder set points, mill differential pressure, separator speeds, kiln fuel and feed ratios, cooler grate speeds and ID fan dampers all operate under supervisory control. The overview training stresses that no amount of automation replaces a good mental model, but that automation multiplies the effect of one. The operator console displays the flowsheet schematically, and the operator’s eye follows the same sequence as this article: solids in, gases in, reactions in the middle, products out.

• Fast loops: raw mill product fineness, separator speed feedback, cooler grate pressure drops.
• Slow loops: kiln feed chemistry, preheater double strings balancing, cooler recuperation optimisation.
• Diagnostic alarms: high burning zone temperature, high CO in the preheater (risk of explosion), mill vibration, seal air pressure low.
• Advanced control: model predictive controllers that steer fuel against feed and NOx while holding free lime target.

The presentation closes this part of the argument by reminding the audience that every display on the console is a physical truth about a machine: temperatures, pressures, flows and vibration readings are the sensors’ report of what is actually happening inside, and the engineer who treats them as entertainment rather than evidence cannot operate safely.

17. Environmental Performance and Emissions Control

The cement industry has transformed its environmental footprint over the past two decades, and the modern process description must include dust control, air quality and CO₂ management. Dust from the raw mill, kiln, coal mill and finish mill is captured by bag filters or electrostatic precipitators; the captured dust is normally returned to the process, so effective filters are both an environmental and an economic asset because the recovered material is product.

Gaseous emissions are regulated for NOx, SO₂, CO and heavy metals. Primary NOx reduction comes from process tuning — stable kiln operation, staged combustion in the calciner, proper flame control — followed, where required, by SNCR or SCR abatement. Sulfur enters with the fuel and raw materials and is largely captured by the alkaline meal, but peaks occur when fuel sulphur or raw pyrite levels spike. The process engineer’s toolbox for emissions therefore spans the whole flowsheet, from raw mix design to waste heat recovery, and the overview makes the point that environmental performance is a process outcome, not an add-on.

18. Frequently Asked Questions

What is the main difference between the dry and the wet process?

The dry process feeds a dry powder (less than 1% moisture) into a cyclone preheater and precalciner, while the wet process feeds a slurry of 30–40% water into a long wet kiln. The wet process consumes roughly twice the heat because all the water must be evaporated; the dry process is the modern standard.

Why is homogenization needed if the mill proportions the feed?

Proportioning holds the average chemistry, but every detector has noise, every feeder has lag and every quarry batch varies. The silo smooths the short-term fluctuations so the kiln sees a stable feed; without it, kiln control would chase chemistry swings and produce variable clinker quality.

What does a calciner actually do?

A calciner burns a large share of the fuel (often 50–65%) in suspension with the raw meal, doing most of the calcination before the kiln. This offloads the kiln, raises output and keeps the burning zone temperature manageable, and it is why modern preheater towers reach 90–95% calcination at the feed end.

Why does cooling rate matter for clinker quality?

Fast cooling stabilises alite and prevents belite transformation, improving cement strength, and controls the state of the glassy and crystalline phases. Very slow cooling grows larger crystals that grind more easily but can reduce strength; the cooler is therefore a quality control instrument.

Which energy figures should an engineer know by heart?

About 1.6 t raw meal per tonne clinker, roughly 3.0–3.3 GJ heat per tonne clinker for a modern line, 90–120 kWh/t of electricity across the plant, and a finish-grinding share of about 35–40% of that electricity.

What role do alternative fuels play in the process?

Alternative fuels replace fossil fuels in the kiln and calciner, cutting fuel cost and CO₂. Because their ash joins the raw mix and their chemistry affects the sulphur-alkali cycles, they must be managed through fuel blending and feed corrections rather than simply dumped into the flame.

19. Summary: The Process as One Connected Machine

This process overview has followed a tonne of stone through every unit operation, from the quarry blast to the cement bag. The point of the whole exercise is integration: crushing feeds the mill, the mill feeds the silo, the silo feeds the preheater, the preheater feeds the kiln, the kiln feeds the cooler, and the cooler returns hot air to the kiln while feeding the finish mill. Material, gas and energy loop through the plant in a carefully balanced web, and the process engineer’s craft is to understand each loop, its time constants and its failure modes, and to hold every one of them inside its design window simultaneously.

Master the flows and the numbers hold together: the raw meal factor, the heat consumption, the electricity per tonne and the emissions all fall out of the same balance. That is why this Process Overview belongs at the start of any serious cement training path, and why the full set of course files — including this presentation and hundreds of supporting documents — is such a powerful tool for building the complete engineering skill set in one purchase.

Whether you are preparing for commissioning, studying for an interview, or re-training an operating team, this material gives you the structured map every cement professional needs. Add it to your professional library today and start building the mental model that leads reliable operation, low energy costs and quality cement, month after month.

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.