Brief Introduction of 1. Lithium Carbonate Carbonization Purification System

With the development of new energy vehicles, the lithium battery industry is developing rapidly. At the same time, the demand for lithium carbonate is increasing, the scope of application is expanding, and the purity requirements of lithium carbonate are getting higher and higher. It is imperative to purify industrial grade lithium carbonate to produce battery grade or high purity lithium carbonate.

Industrial lithium carbonate purification generally use carbonization decomposition method. The method has the characteristics of simple operation, high purification efficiency, low production cost, and low pollution. The mother liquor part after thermal decomposition can be returned to the slurry for recycling, which effectively improves the recovery rate of lithium.

lithium carbonate carbonization purificationProcess introduction: the industrial grade lithium carbonate and water (or return to the mother liquor) according to a certain proportion of slurry, adding a certain amount of complexing agent to obtain lithium carbonate slurry. Under a certain pressure and temperature, the lithium carbonate slurry is carbonized with carbon dioxide through a carbonization tower to obtain a lithium bicarbonate solution. The lithium bicarbonate solution was filtered to remove impurities to obtain a purified liquid. The purified liquid is heated and decomposed by a decomposition tower to obtain a purified lithium carbonate slurry. The pyrolyzed lithium carbonate slurry is thickened by a thickener, and then subjected to centrifugal separation, drying, screening, iron removal, crushing, mixing, and packaging to obtain battery-grade (high-purity) lithium carbonate. The decomposed carbon dioxide can be recovered by a carbon dioxide recovery system.

Brief introduction of 2. lithium carbonate carbonization purification system equipment

1. The carbonization equipment can be continuous or intermittent.

The continuous carbonization tower can be mechanically stirred or not. The carbonization system adopts multi-stage series operation, and the countercurrent operation of lithium carbonate slurry and carbon dioxide gas not only improves the conversion rate of lithium carbonate, avoids the loss of lithium carbonate with filter residue, but also improves the utilization rate of carbon dioxide and greatly reduces the production cost. The carbonization tower without stirring has no transmission device, and the transmission device leaks contaminated materials. The continuous carbonization tower has high carbon dioxide utilization rate, relatively simple system operation, high degree of automation, low labor intensity and high production efficiency.

The intermittent carbonization tower is generally equipped with a stirring device to increase the contact area between the material and the carbon dioxide. The intermittent carbonization system has low carbon dioxide utilization rate, frequent operation, high labor intensity and low production efficiency.

2. The decomposition system can be continuous or intermittent.

The decomposition system equipment adopts a continuous decomposition tower, and the lithium bicarbonate solution and steam are indirectly heat exchanged to make the lithium bicarbonate pyrolyze at a certain temperature. The key to the control of the continuous pyrolysis system is first how to avoid scarring of the heat transfer surface, and secondly how to ensure the particle size of the decomposed lithium carbonate crystals. These two points are related to the success or failure of the continuous decomposition system design.

If the intermittent decomposition tower, can use the same equipment with the carbonization tower, carbonization after filtration and then return to the decomposition, after decomposition of the heat exchange surface of the formation of crystalline scale can be carbonized again to eliminate. The same equipment at different times into the circulating cooling water cooling or steam heating, repeat this cycle, this method is more troublesome to operate.

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