With the optimization of the lithium extraction process from lepidolite, lepidolite has achieved large-scale production, and its advantages of abundant reserves and low raw ore cost have gradually emerged. A key step in the lithium extraction technology from lepidolite is the grinding of lepidolite roasted material. So, how is the grindability of clinker lepidolite?
Spodumene generally has a higher lithium content than lepidolite, making it more suitable for the production of lithium-containing raw materials. Lithium extraction from lepidolite has certain advantages. So what is the grindability of clinker lepidolite?
The existing preparation of lithium carbonate generally involves mixing and finely grinding limestone and lepidolite concentrate, and then roasting the mixture. The roasted clinker is then quenched with water, finely ground, and then leached for subsequent reactions. Although this method has wide applicability, it consumes a lot of energy and has a low lithium recovery rate. The biggest disadvantage is that it requires fineness of lepidolite. Lepidolite needs to be ball milled to a certain fineness to meet the leaching rate requirements. , the reaction time is also relatively long. A large amount of aluminum is also leached 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. During the process of water quenching and fine grinding, the fineness of the grinding material cannot be accurately controlled, resulting in over-grinding of the clinker. Moreover, the use of wet ball milling consumes a lot of materials and the equipment used is more complex. In the process of producing lithium carbonate, it is very difficult. It is necessary to improve the grinding process of roasted clinker. The grindability of clinker lepidolite is more suitable for the dry process. After the improvement, dry grinding is used. Only coarse crushing equipment and a mill for calcining lepidolite can be used for production. The equipment is simple, and after grinding Screening the raw materials can control the fineness more accurately and prevent over-grinding.
The specific process of processing clinker lepidolite using a mill for calcining lepidolite is: after the lepidolite roasted clinker comes out of the kiln, the temperature is lowered to no higher than 110°C for rough crushing of the clinker. The coarse crushing equipment used can be: Any of the jaw crushers, cone crushers, hammer crushers, and shredders can be selected according to the company's own conditions, and the rough crushing process is a further preparation for the next step of grinding. Grind the clinker that has been coarsely broken in the previous step. Grindability of clinker lepidolite: The hardness of lepidolite roasted clinker is ≤2.5hb and is relatively brittle. According to the material properties, a vertical mill is used for grinding. The ground clinker is extruded and crushed in the vertical mill. It is mainly grinded by the grinding disc, grinding roller and 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. Wet ball mill is used. It mainly relies on the extrusion and grinding of steel balls and materials. The loss of steel balls is relatively large, and steel balls often need to be replenished. The clinker after grinding by the vertical mill is screened. Because dry grinding is used, compared with wet ball milling, there will be no over-grinding, which reduces energy consumption and ensures subsequent follow-up.
Hongcheng HLM series vertical mill is a mill used for calcining lepidolite. It integrates crushing, drying, grinding, grading and transportation, and solves the problem of low output, high energy consumption and maintenance cost of ordinary industrial mills. The product performance has reached the international advanced level and can replace expensive imported vertical mills to meet the needs of large-scale, intelligent and intensive industrial milling. Finished product particle size: 22-180μm Production capacity: 5-200t/h. In addition to grinding lepidolite roasting materials, the HLM vertical mill can also realize deep processing of lithium by-products of lepidolite extraction such as lithium slag and feldspar powder and turn waste into treasure. If you have relevant needs, please leave us a message to learn more about the equipment.