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Limestone which is mainly made up of calcium carbonate（CaCO3）is largely used as building material & industrial raw materials. Limestone can be directly processed into aggregated rock and burnt into unslaked lime which becomes slaked lime after its moisture & water absorption. The main content of slaked lime is Ca(OH)2. Slaked lime can be blended into lime slurry, lime putty, lime mortar etc. Which can be used as coating material, brick & tile adhesive. Limestone is the main raw material of glass production. Calcium carbonate can be directly processed into aggregated rock and burnt into unslaked lime. There are two types of lime: unslaked lime and slaked lime. Unslaked lime is lumpy, its main content is CaO, pure unslaked lime is white, unslaked lime with impurities is light gray or light yellow. Cement is made from mixture of limestone and clay etc. by high temperature calcining.
Limestone mill grinds limestone into powder, limestone powder has different specifications:
- It can be used to produce anhydrous calcium chloride which is the main auxiliary raw material of sodium dichromate production. It is the main raw material of glass & cement production, it also can be used in the areas of building materials and poultry feed.
- It is the raw material of glass & anhydrous calcium chloride, it can be used as white filler of rubber & oil paint, it also can be used in building area.
- It can be used as filler of plastics, coating putty, coating material, oil paint, plywood.
- It can be used as filler of wire insulation layer & rubber molded parts & asphalt felt.
- It can be used as desulphurizing absorbent for flue gas desulphurization in power plant.
Limestone powder for desulphurization in power plant is the most widely used in the market.
Component analysis of limestone raw material
| CaO | MgO | Al2O3 | Fe2O3 | SiO2 | so3 | burning amount | loss amount |
| 52.87 | 2.19 | 0.98 | 1.08 | 1.87 | 1.18 | 39.17 | 0.66 |
Remarks: limestone in different areas differs greatly, limestone with high content of SIO2, Al2O3 is very difficult to grind.
The model selection scheme of limestone powder making main engine
| Product specification(mesh) | 95%particles’ grain size is over 200meshes | 90% particles’ grain size is over 250meshes | 90% particles’ grain size is over 325meshes, |
| model selection scheme |
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1．Power consumption: 18～25kWh/ton, it differs according to different materials and product requirements.
2．Selecting main engine according to output & grain size.
3．Main application: desulphurization in power plant, blast furnace smelting solvent etc.
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1.Pendulum mill(R、HC、HCQ):
It can grind coarse powder whose grain size is under 600 meshes, low investment cost, low energy consumption.
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2.Vertical Roller mill(HLM、HLMX):
It can meet the demand for large scale production, high output, good stability. Disadvantage: high investment cost.
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3.Ring roller mill(HCH):
It can produce ultrafine powder, low energy consumption low investment cost, large scale ring roller mill has good market prospect. Disadvantage: low output.
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4.Ball mill +classifying:
High energy consumption, it is almost obsolete in nonmetallic mineral industry.
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