Limestone is the main raw material for the production of cement, concrete coarse and fine aggregate, lime, etc. Generally, the dry process is used, and the corresponding process is selected according to different application fields:
- For limestone used in metallurgy and road construction, the ore is usually crushed and sieved.
- For the 246-43μm fine powder products used as feed additives and general fillers, the ore is crushed, then grinded by Raymond mill, vertical mill, etc.
- For ultra-fine limestone powder and high-grade filler for flue gas desulfurization, ultra-fine crushing and fine classification are required.
Limestone Grinding Process
- Open circuit process: the process that the material passes through the mill as a finished product for the next link operation;
- Closed-circuit process: when the material is sorted out by one or several stages after being ground, the fine particles are used as finished products, and the coarse particles are returned to the mill for re-grinding.
Therefore, at present, most limestone powder manufacturers choose a closed circuit process, which can reduce the phenomenon of over-grinding, improve the efficiency of the mill, and reduce energy consumption. In addition, the limestone powder produced by the closed circuit process has a uniform particle size and is easy to adjust to meet different fineness requirements.
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