Grinding Methods In The State Of Development: Complete Guide

The grinding methods in the state of development are the frontier of the comminution science: the world of the cement and the minerals is not standing still, and the methods that grind the tonnage of today, the capital, the robots and the research laboratories are constant: the classical ball mill is being challenged by the roller mills, the presses, the stirred vessels, the jet grinding and the exotic physical methods: the phrase itself — the grinding in the state of development — is the honest name the industry gives to those technologies that are past the laboratory dream and not yet the universal standard: the engineers of the world are grinding the future today.

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 guide to the developing grinding methods with its surveys, the cross-sections, the comparisons and the extrapolations: this article walks the document: the history of the grinding methods, the mature technologies, the developing families, the energy comparisons and the horizon of the next generation: the reader leaves with the map of the comminution of tomorrow in his hand.

The grinding science is a strange discipline: the theoretical minimum energy to create the new surface is a small fraction of the energy the real machines consume: the real plants spend the kilowatt-hours at an efficiency of only 1 to 10 percent of the theoretical: this gap is the engine of the development: every new method is a hunt for the wasted 90 percent: the file tells the history of the hunts and the current state of each: this article follows the document section by section.

1. The History of the Grinding Methods: The Evolution of the Mill

Every developing method of today stands on the shoulders of the crushers and the mills of the past, and the file opens the historical lens:

• The primitive comminution: the pestle and the mortar, the quern stones of the grain, the stamp mills of the ores: the crushing of the material between the two surfaces: the ancestral bed of all the modern methods;
• The industrial crushers: the jaw, the gyratory and the cone crushers of the nineteenth century: the Machinery of the iron era: the size reduction of the coarse to the manageable; the crushers remain the head of every line today;
• The tube mills: the ball mills and the rod mills from the turn of the twentieth century: the tumbling cylinders of the steel media: the standard of the cement for a hundred years: the family continues its reign;
• The autogenous age: the mid-century experiments with the rock grinding the rock: the AG and the SAG mills of the mineral industry: the elimination of the media: the success in the mines, the detour in the cement;
• The energy crisis drive: the 1970s energy shocks pushed the development of the roller presses and the vertical mills: the kilowatt-savings became the measure of the method: the development that frames the state of the art today;

The history is the teacher of the present: every effective technique of the modern plant is an evolutionary descendant, and the evolutionary pressure has always been the same: the energy per tonne and the cost per tonne: the file’s historical chapter is short but crucial: the reader learns why the industry holds the bonds and balls at all, and why the new machines keep arriving: the direction of the evolution is written in the century of the kWh.

2. The Thermodynamics of the Grinding: The Target of the Development

All the developing methods chase the same thermodynamic target, and the file explains the physics of the chase:

• The theoretical minimum: the free surface energy of the new surfaces created: the calculated minimum for the reduction of one tonne of the clinker to the cement fineness is about 2 to 5 kilowatt-hours per tonne: the theoretical law of the surface energy;
• The practical consumption: the real plants spend 25 to 45 kWh per tonne on the same task: the efficiency of the conventional process of 5 to 15 percent of the theoretical: the enormous waste – the heat, the sound and the wear:
• Where the energy goes: the elastic deformation of the particles, the friction of the media, the sound of the impacts, the heat of the tumbling, the air resistance and the wear: the file’s breakdown of the losses for the classical mill;
• The target of the development: every developing method reduces one of the loss channels: the bed methods reduce the media losses, the stir methods reduce the dead media, the jet methods remove the mechanical media entirely: the pursuit of the minimum waste:
• The floor of the physics: the honest ceiling: the particles will always deform before they break, and the true minimum is unreachable: the best real machines approach the 20 to 30 percent efficiency: the physical floor of the grinding:

The thermodynamics fixes the game: the total eliminable waste of the industry is the tens of billions of the kilowatt-hours per year worldwide: every half-percent of the efficiency gain pays the plant the millions: the state of the development is a race against the entropy, and the file’s thermodynamic chapters give the reader the yardstick to judge every claim of the vendors: the physics first, the marketing after.

3. The Mature Methods: The Ladder of the Established Practice

Before the developing frontier, the file fixes the current hierarchy of the mature methods:

• The jaw, the gyratory and the cone crushers: the coarse reduction of the blocks of 1 meter to the lumps of 20-50 millimetres: the energies of 0.5-2 kWh per tonne: the most efficient stage of the whole line, the crushing: the cheap part of the size reduction;
• The impact crushers and the sledgers: the rotor and the anvil: the aggregates and the pre-crushing of the clinker: the high-capacity and the medium-soft duty: the energy between the crushers and the mills;
• The rod mills: the coarse grinding to the 1-5 millimetres: the wet primary grinding of the ores: the cement plants see them rarely, the mines often: the revolver of the coarsest fine;
• The ball and the tube mills: the dominant of the cement: the 10-100 micrometers of the product: the closed circuit with the separator: the mature, the studied and the understood machine: the bedrock of the cement;
• The vertical roller mills and the presses: the newest of the mature: the bed methods at 30-50 percent saving: the modern standard of the raw and increasingly of the finish: the bridge between the old and the developing;

The maturity ladder matters because the developing methods don’t replace the ladder: they enter at the specific rungs: the crushers remain the head, the mills the muscles: the state of the development is about the middle of the ladder where the energy is the largest: the file’s placement of each technology on the rung is the first thing the engineer checks: the right tool for the right size interval.

4. The High-Pressure Grinding Rolls: The Pressing Development

The roller press — the HPGR — is the most successful of the modern developments and the file gives it the full chapter:

• The principle: two counter-rotating rolls of 1 to 2.5 metres in diameter press the material under the pressures of 50 to 250 megapascals: the feed is squeezed between the rolls in a single pass: the flake of the crushed bed is discharged and the seams propagate:
• The numbers: the pressing of the clinker at 4-8 kWh per tonne prepares the mill feed: the whole circuit (press plus ball) shows the 20-40 percent energy savings over the classical: the press is the most successful comminution development of the last 30 years:
• The applications: the pre-grinding of the cement clinker, the grinding of the slag, the pressing of the raw mix and the ore work in the mining field: the hundred and the thousands of the HPGR in operation across the world:
• The issues: the brimmed edge wear, the feed sizing discipline, the moisture limit: the press requires the de-aerated, steady feed; its limited reduction ratio makes the interlinking with the classifier and the mill necessary:
• The state: the file classifies the HPGR as the furthest along: the maturing, not the “developing” in the strict sense: the standard developer of the modern circuit: the launchpad of the still-newer machines:

The HPGR story is the blueprint of the whole field: the press principle, the battle of the wear, the integration with the monor circulation: the industry learned the recipe of success: what the HPGR did to the ball the stirring and the jet methods are attempting on the fine end: the file’s HPGR chapter is the master class of the development at work: the engineers of the package use its curves daily.

5. The Stirred Media Mills: The Agitation of the Fines

Where the fine grinding must go below the ball’s comfort, the stirred mills take over, and the method is developing fast:

• The principle: a stationary drum with a rotating agitator drives the small media (1 to 10 millimetres) at the tip speeds of 10 to 25 metres per second: the energy density in the vessel is far above the tumbling: the attrition dominates the breakage:
• The tower mills: the screw agitator in the vertical cylinder: the media of 6-12 mm: the product to the 30-80 microns in the minerals: the compact footprint and the fine products: a proven mineral-industry machine:
• The high-intensity mills: the horizontal or the vertical stirred zones with the media of 1-3 millimetres: the products to the 5-20 microns: the ultrafine grinding of the fillers, the pigments and the energised slag: the power densities 3-4 times the ball:
• The cement applications: the ultrafine slag and the fly ash activation, the composite cement production: the stirred milling of the SCMs to the 6000-9000 Blaine with the success in the premium market lines:
• The state: the stirred mills are at the threshold: proven in the minerals and the pigment, entering the cement slowly: the development focus: the media cost, the wear, the scale of the million-tonne plants:

The stirred family answers the call of the ultrafine world: the carbon-reduced cements need the intense SCM fineness and the stirred vessels are the shortest route: the file’s chapters document the machine families, the media strategies, and the case numbers of the operating stirred lines: the engineer follows the development curve with the installation data: the stirring today is what the press was 25 years ago.

6. The Jet Mills and the Fluid Energy Grinding: The No-Media Methods

The jet mill grinds with no media at all — the particles grind each other in the gas jets — and the method fascinates the developers:

• The principle: the feed particles are accelerated in the jet of the compressed air or steam to the velocities of 300-500 metres per second: the particles collide with the particles at the focus of the jets: the self-grinding without the metal contacts:
• The products: the very high fineness: the 90 piping the 3 to 10 micrometres: the narrow size distributions and the clean surfaces: the abrasion-free product: the specialty grinds of the alumina, the pigments, the pharmaceuticals and the high-tech ceramics:
• The energy costs: the compression of the air is the expensive act: the energy of the jet grinding an order of magnitude above the mechanical: the 100-500 kWh per tonne for the ultra fines: the method remains economic only where the value of the product justifies:
• The steam grinding: the superheated steam jets for the coarse: the steam as an energy carrier: the domestic application in the Europeans of the past, the revival interest for the fine products: the energy balance of the steam cycle:
• The state: the jet methods are not the cement tonnage: they are the developing method that the cement watches for the SCM activation: the 10-micron slag powder: the specialized premiums; the file’s honest estimate: the niche specialist today, the study of the tomorrow:

The jet developments beat the laws of the contact: the particles, the media and the men removed: the five percent efficiency of the mechanical machines remains the target that the jet also misses, and the file says so: the state of the jet grinding in the cement: promising, far: the document holds the test data of the clinker and the SCM jet experiments: the reader forms the judgment on the numbers.

7. The Autogenous and the Semi-Autogenous Methods: The Rock Grinding the Rock

The AGSAG method removes the grinding media and lets the burden break itself:

• The autogenous mill: the large-diameter mill of 8-12 metres with the feed of the ore blocks: the large pieces act as the crushing media: the fine particles grind themselves: no balls, no rods: the mineral ores of the world run the AG lines at the massive scales:
• The semi-autogenous: the SAG mills with the small addition of the balls (6-12 percent of the charge) to assist the autogenous breaking: the standard of the copper and the gold extraction: the lines of 20,000-40,000 kW machines: the kings of the mining tonnage:
• The cement relation: the clinker is not the ore: the cement industry tried the AG for the raw but the inhomogeneity of the feed made the control difficult: the cement stayed with the media mills: the autogenous survives at the mine:
• The development lesson: the AG/SAG taught the industry the value of the interparticle breaking: the lessons fed the presses and the vertical mills: the energy and the media savings validated: the file discusses the transfer:
• The hybrid novelties: the research into the controlled autogenous grinding of the clinker with the return-to-feed fractionated circuits: the file’s exploration of the niche: the state of the art:

The autogenous chapter is the “what if” of the design: the method that works on the homogeneous hard ores and fails on the heterogeneous clinker: the file’s thesis teaches the engineer why the materials choose the method and the method chooses the materials: the development of the comminution rarely transplants the mineral-application directly into the cement: the transfer requires the adaptation, and the adaptation is the art of the file.

8. The New Crushers and the High-Tech Grinding Aids: The Chemical Methods

The development of the grinding is not only the machines: the chemistry rides along, and the file carries both rails:

• The grinding aids: the chemical agents (the amines, the glycols, the triethanolamine compounds) added at the 0.02-0.05 percent of the cement: they reduce the agglomeration of the fines and the coating of the media: the mill output rises 5-20 percent at the same fineness:
• The auxiliary effect: the success of the powder flow, the decrease of the temperature, the improvement of the roofs of the separators: the assist is a mechanical-chemical of the grinding: the interaction with the mill method:
• The modern aids research: the new generation of the aids for the SCM: the activation of the slag’s surface: the performance of the pozzolans: the aids economics of the blended cements: the file’s the impact on the mill development:
• The supplements and the chemical activation: the alkaline catalytic, the grinding under the special atmospheres (the moist, the inert): the acceleration of the fracturing: the lab results, the scaling challenges:
• The state: the chemical route is the silent partner: never a mill itself, always a multiplier: the state of the development of the aids is the most commercial of the field: the patent curve of the world:

The chemical methods multiply the machine, and the multiplication factor lands directly in the energy: the file’s chapters quantify the aid savings on the ball and the vertical: the new additives tuned per the material: the engineer of the package runs the trials with the protocols of the file: the results of the campaigns of the industrial-scale: the chemistry is a track of the comminution: the file’s holistic view: the machines, the aids and the control, one system.

9. The Electrical and the Thermal Breaking: The Developing Exotics

The research mythology: the electrical and the thermal methods of the breaking:

• The electro-hydraulic breaking: the powerful discharge in the water focus the shockwave on the particle: the axial split of the lumps: the selective liberation of the ores: the research projects of the hard-rock mining: the low throughputs limit:
• The microwave assisted:** the pre-heated mineral heats the interfacial minerals selectively: the microcracks: the downstream grinding costs drop 10-30% in the experiments: the industrial demonstration: the energy of the microwave service:
• The thermal shock: the heating and the quenching of the run: the cracking the particles by the thermal stress: the cheap but slow and the batch: the desert applications: the file’s: honest: the state: early research:
• The ultra-sound and the shock waves: the acoustic limit: the surface cleaning: the limit of the volume: the niche of the cleaning and the alumina: the cement: no
• The state of the exotic: the file ranks the exotic methods by the readiness level: from the concept to the pilot: the honest: the majority decades away from the cement tonnage: the reading room of the development:

The living always ask: will the electricity shatter the clinker like the lightning? The state of the answer: the promise of the selective fracturing is real, the energy economics remain the unproven: the file’s the extended chapter: the tests of the pilot machines at the university benches and the mine sites: the reader learns to separate the physics from the fantasy: the comminution science has earned its skepticism.

10. The Dry Processing and the Whole-Circuit Developing

The latest development is not the single machine but the whole circuit, and the file takes the systems’ view:

• The dry classification development: the high-efficiency separators at the 90-95% sharpness and the multi-stage airs of the fines: the complete dry delth sectors: the dry mineral: the waterless selection:
• The energy of the system: the drives, the fans, the classifiers and the conveying: the systems engineering: the reductions of the number of the equipment: the vertical lines with the total kWh/t as the yard:
• The air-lift and the internal classification: the material lifted by the air: the mill: Missa the mechanical elevators: the removal increases the energy: the internal design solves: the loop of the new plants:
• The automation and the model-based operation: the developmental methods join the artificial intelligence: the grinding plant, the self-optimizing: the file: the automation layers: the neural of the mill: the 2-6% the additional savings: the post optimizations:
• The whole-cycle accounting: the LCA of the grinding: the greenhouse and the energy of the machinery supply: the metric of the CO2 per tonne of the produced fineness: the trend of the next: the file: the closing chapter:

The state of the development is not the battle of the single machines: it is the systems’ competitive: the newer circuits share the energy not only in the mill but in the fan and the robotic choreography: the file’s system chapters the balance: the turbine, the mill, the separator the control: the reader: the manager of the mill: the architecture of the modern design: the whole is the plan of the developer.

11. The Economics of the Developing Methods: The Adoption Curve

The engineers at the market demand the one question: what is the payback?

• The three costs: the energy into the kilowatt, the media and the wear in the consumables, the capital interest of the new line: the adopting decision weighs the three: the file’s normalized cost of the grinding:
• The adoption curve: the new technique features the s-curves: the innovators in the early years, the majority later: the HPGR took 20 years to the mainstream: the VRM finish another two decades: the stirring mill is the climb of today: the curve of the cement:
• The fit of the plant: the energy price of the location, the cost of the media, the price of the electricity: the file’s examples: the same 5000 tonne plant in the cheap- and in the expensive-power worlds: the economics of the two cases: the different select:
• The risk of the technology: the experience curve and the learning of the suppliers: the file: the real and the ideological: the cases of the plants that rushed and the ones that waited: the engineering: the step:
• The metrics: the levelized cost of the grinding: the cost per tonne of the finished fineness: the cleanest of the comparison: the file’s the templates: the reviewer with the own numbers:

The development of the methods is guided not by the patents but by the payback: the file teaches the financial: the disciplined technology valuation: the reader walks the case: the vertical vs the stirring, the press vs the ball, the classic vs the exotic: the calculations decide: the file is economics as much as the physics: the two sides of the development cliff.

12. The Environmental and the Sustainability Trends: The New Drivers

The recent decade added a new force of the development: the climate:

• The CO2 of the electricity: the kilowatt-hour of the fossil power carries its carbon with it: the energy efficiency is the carbon plan for the cement: every kWh saved reduces the footprint of the plant: the new methods sell the carbon too:
• The binders: the clinker reduce: the supplementary materials: the grinding of the SCMs: the drastic fineness requirement: the stirred and the specialized mills enter as the carbon: the enablers: the file’s the target:
• The dry route: the elimination of the water and the drying: the energy of the wet method vs the dry: the overall and the carbon: the sector: the total carbon of the cement:
• The recycled materials: the concrete rubble, the clinker draws: the grinding of the recycled cement: the new feed: the new methods: the development: the resource:
• The reporting and the benchmarks: the frameworks of the sustainability: the inspections of the energy: the ISO standards: the file: the reporting tables of the grinding-carbon: the industry of the audit:

The environment is perhaps the strongest force that has ever moved the grinding development: the two fuels (the hydrocarbon and the clinker pull) push the plants toward the energy- and fineness-extreme: the file: the development of the methods under the new force: the engineer: the tools: the market: the awards: the state: good time to be the comminution.

13. Conclusion

The grinding methods in the state of development: the historical rungs the industry climbed, the pressing and the stirring of the today, the jet the autogenous, the electrical and the systems’ economics: the field: alive: the energy of the kWh/t and the carbon per tonne call the new methods: the classical mill remains the king, but the king is now married to the presses and the emerging loops: the engineer: the new: informed: the state of the development is the book of the possible that is becoming the probable: the cement of the tomorrow, in the machines of today’s no more.

The Complete Cement Technical Package includes this survey of the grinding development with the machine catalog, the comparisons, the economics and the trends: the one-time $249.99: the instant download: the library: the article has travelled from the mortar to the microwave: the reader: the complete official of the comminution timeline: the implementation decisions of tomorrow: the knowledge, the present: the package, the totalities.

The Frequently Asked Questions

What does “the developing methods” mean in the industry?

The developing methods are the grinding techniques that have passed the laboratory proof but have not yet become the universal standard: the group price: the correct ones are the HPGR presses on the way in, the vertical finish mills expanding, the stirred mills in the adoption, and the exotics of the jet and the elect still entering: the classification changes every few years: the development is a ladder, not a binary.

Why is the energy consumption of grinding so far from the theoretical?

The theoretical minimum is the surface energy of the cracked bonds, but the real process spends the energy on the elastic deformation, the motion of the media, heat, sound and wear first: the real mills run at the 5-15% efficiency: the whole history of the comminution development is the hunt for the reduction of the waste channels: every method succeeds by plugging a channel.

Is the roller press the best developing method?

The HPGR is the most established: the 20-40% energy saving versus the ball, the industrial proof in the hundreds of plants: it is the best documented: the “best” depends on the site: the limestone is a press-friendly feed, the hardslag disadvantages: the file shows the comparative: the press is the first of the new methods to reach the industrial maturity mark.

Will the ball mill disappear in the coming years?

It will not disappear: the ball family still reigns in the flexibility, the robustness and the huge installed base: what changes is the share: the new capacity flows to the verticals and the presses, and the balls are increasingly the finish stage behind the new pre-grinders: the old workhorse yields the crown slowly, but it will remain in the circuit for decades.

What is the smallest useful grinding method for the SCMs?

The stirred mills and the optimized vertical mills are the current candidates for the SCM ultrafines: the slag and the fly-ash to the 5000-8000 Blaine with the predictable distributions: the jet methods: the niche: the stir and the vertical, the practical industrial route of the low-carbon cement today: the best guidance: measure with the lab, choose by the kWh per tonne.

Do the aids help the new methods too?

Yes: the same grinding aids that assist the ball mills improve the vertical, the presses and even the stirred processes: the effect is the reduction of the cohesion and the rise of the flowability: the new machines with the aids hit higher throughputs and lower specific energies: the file’s the testing: the contract: the chemistry benefits, the whole family of the mills.

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