The main component of limestone is calcium carbonate (CaCO3). Lime and limestone are a large amount of raw materials used in construction materials and industry. Limestone can be directly processed into stone and burned into quicklime. Quicklime CaO becomes slaked lime by absorbing moisture or adding water. The main component of slaked lime is Ca (OH) 2, which can be called calcium hydroxide. Slaked lime is formulated into lime slurry, lime paste, etc., used as coating material and tile adhesive . It is widely used in varied industries for environmental protection and use in industrial processes and applications, in the non-ferrous metals and minerals, iron and steel, chemicals, portable water, pulp and paper, oil & gas, cement and construction, agriculture, animal husbandry and aquaculture. Other applications are in waste water and sludge treatment, sugar refining, flue gas treatment, glass and ceramics, roads and soil stabilization, food preparation, supplements and many more.
The limestone is fed into the bucket elevator and subsequently transported to the raw material warehouse for grinding.
After grinding, the finished products are gathered by powder concentrator, and then conveyed to a screw conveyor.
The finished products are transported to the storage warehouse, while the excess gas is filtered by the dust collector.
The whole system is equipped with three pulse dust collectors to guarantee that the whole system is free of dust leakage.
The system is outfitted with an intelligent PLC control cabinet and an upper computer.
The system is equipped with an intelligent PLC control cabinet and an upper computer.
Limestone ore powder plays a filling role in the asphalt mixture, the purpose is to reduce the gap of asphalt concrete, reduce the amount of cement, improve the work ability of concrete, and reduce the heat of hydration.Asphalt mixing plants generally use limestone powder of about 180-200 mesh to improve the adhesion between asphalt and aggregate.
"Highway Asphalt Pavement Construction Technical Specifications" JTG F40-2004
| Limestone sub-technical requirements | Technical index | |
| Water Content ≤ | 2.5 | 2.45 |
| Appearance | No lumps | |
| Particle size range | ＜0.6mm | 100 |
| ＜0.15mm | 90-100 | |
| ＜0.075mm | 75-100 | |
The mainstream desulfurization method currently used in thermal power plants is flue gas desulfurization.
Limestone for Desulfurization Industry DB13/T2032-2014 Standard
| Project | Index | |||
| Grade Ⅰ | Grade Ⅱ | Grade Ⅲ | ||
| Appearance | gray white powder with basically the same color and no impurities | |||
| Caco3 | ≥94 | ≥92 | ≥90 | |
| MgCO3 | ≤5.0 | |||
| Particle size | 325 mesh D90 | |||
Limestone is the main raw material for manufacturing cement, lime and calcium carbide, and it is the indispensable flux limestone in metallurgical industry.
Limestone cement, mortar and concrete Industry GB/T 35164-2017 standard
| Item | Index | ||
| MB value | Grade Ⅰ | ≤0.5g/kg | |
| Grade Ⅱ | ≤1g/kg | ||
| Grade Ⅲ | ≤1.4g/kg | ||
| Particle size | A | 325 mesh D85 | |
| B | 300 mesh | ||
| Flow ratio | ≥95% | ||
| Caco3 | ≥75% | ||
| Compressive strength | 7d | ≥60% | |
| 28d | |||
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