With the optimization of the lithium extraction process from lepidolite, lepidolite has achieved large-scale production, and its advantages of abundant reserves and low cost of raw ore have gradually emerged. Therefore, the development of lepidolite to extract lithium will become a strategic need in China. A key step in the lithium extraction technology from lepidolite is the grinding of lepidolite calcined material. Then, what is the grindability of clinker lepidolite? HCMilling(Guilin Hongcheng) is a grinding mill manufacturer for the production of calcined lepidolite. The calcined lepidolite grinding mill we produced has been successfully applied in the lithium extraction project from lepidolite. The following will analyze and answer this question for you.

The lithium content of spodumene is usually higher than that of lepidolite, which is more suitable for the production of lithium-containing raw materials. However, there are few spodumene ore resources in my country, mainly relying on imports from Australia and other places, and the stability of supply guarantee is insufficient. my country has the largest reserves of lepidolite in Asia, so from the perspective of resource endowment and development cost, lepidolite has certain advantages in extracting lithium. What is the grindability of clinker lepidolite? Existing lithium carbonate preparation generally involves mixing limestone and lepidolite concentrate, finely grinding, and then calcining the calcined clinker. Then, the calcined clinker is water-quenched, finely ground, and then leached for subsequent reactions. Although this method has a wide range of applicability, it has high energy consumption and low lithium recovery rate; the bigger disadvantage is that it requires the fineness of lepidolite, and lepidolite needs to be ball milled to a certain fineness before it can meet the requirements of leaching rate. , the reaction time is also relatively long; the aluminum is also leached out in a large amount during the leaching process, and a large amount of aluminum needs to be removed, which will cause a large loss of lithium; after the reaction is completed, a large amount of sulfuric acid remains, and a large amount of alkali needs to be consumed to neutralize the residual acid. In the process of water quenching and fine grinding, the fineness of the grinding powder cannot be accurately controlled, resulting in over-grinding of the clinker, and the use of wet ball milling consumes a large amount of materials, and the equipment used is more complicated. In the process of producing lithium carbonate, it is very difficult. It is necessary to improve the grinding process of clinker after roasting. The grindability of clinker lepidolite is more suitable for dry process. After the improvement, dry grinding is used, and only coarse crushing equipment and a grinder for calcining lepidolite can be used for production. The equipment is simple, and after grinding The raw materials are screened, which can control the fineness more accurately and prevent overgrinding.

The technological process used by the calcined lepidolite grinding mill to process clinker lepidolite is: after the lepidolite roasted clinker is discharged from the kiln, the clinker whose temperature is lowered to not higher than 110°C is subjected to rough breaking. The rough breaking equipment used can be: Jaw crusher, cone crusher, hammer crusher and shredder can choose the existing equipment according to the company’s own situation, and the rough crushing process is further preparation for the next grinding. Grind the coarsely broken clinker in the previous step. Grindability of clinker lepidolite: The hardness of lepidolite roasted clinker is less than or equal to 2.5hb, and it is relatively brittle. The grinding clinker is crushed and crushed in the vertical roller mill. It is mainly ground by the grinding disc grinding roller and the material extrusion. The loss of consumables is very small and the failure rate is low. This step is completely different from the wet ball mill, and the wet ball mill is used. Then it mainly depends on the grinding of the steel ball and the material, and the loss of the steel ball is relatively large, and it is often necessary to supplement the steel ball. The clinker after being ground by the vertical roller mill is sieved, because the dry grinding is used, compared with the wet ball milling, there will be no over-grinding, and the energy consumption is reduced, ensuring the follow-up The leaching rate of the powder.

HLM series lepidolite vertical roller mill from HCMilling(Guilin Hongcheng) is a mill for calcining lepidolite. It integrates crushing, drying, grinding, grading and conveying, and solves the problems of low output, high energy consumption and high maintenance cost of ordinary industrial grinding mills. The product performance has reached the international advanced level and can replace expensive imported vertical roller mills. Meet the needs of large-scale, intelligent and intensive industrial milling. Finished particle size: 22-180μm Production capacity: 5-200t/h. In addition to grinding the lepidolite calcined material, the HLM lepidolite vertical roller mill can also realize deep processing and reuse of the by-products of lepidolite extraction such as lithium slag and feldspar powder.

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