Frozen crystalline mother liquor lithium carbonate sodium precipitation process, frozen crystalline mother liquor is a common chemical industry operation, generally used to separate and purify compounds. Kang Jinghui evaporator Xiaobian will talk about frozen crystalline mother liquor sodium carbonate lithium precipitation.
First, the lithium precipitation mother liquor process
The sulfuric acid process using spodumene concentrate as raw material and the pyrolysis method of lithium precipitation mother liquor to produce lithium carbonate, and the lithium hydroxide production process by lithium carbonate causticization method have become the mainstream processes of the industry.
That is, after the transformation of spodumene by roasting, it reacts with sulfuric acid at high temperature (250 °C) and then leaches lithium sulfate solution, lithium sulfate reacts with excess soda ash to generate lithium carbonate, sodium sulfate mother liquor containing lithium and excessive soda ash is neutralized and crystallized after removing carbonate to obtain sodium sulfate by-products, containing lithium secondary mother liquor (sodium evolution mother liquor) and then secondary lithium precipitation (reaction with sodium carbonate) to obtain lower grade lithium carbonate. Lithium carbonate and calcium hydroxide are causticized to generate a lower concentration lithium hydroxide solution, which is secondary crystallized to obtain lithium hydroxide monohydrate product.
Second, frozen crystalline mother liquor sodium carbonate lithium precipitation
Sodium carbonate precipitation is a special method used to extract lithium from solutions containing lithium. This process is mainly based on the precipitation of sodium carbonate, which converts lithium ions into lithium carbonate precipitation, thereby achieving lithium separation.
When performing the lithium carbonate precipitation operation of the mother liquor, the solution containing lithium first needs to be frozen and crystallized to remove most of the impurities.
Then, sodium carbonate is added to react with lithium ions to form a lithium carbonate precipitate. In this process, the amount of sodium carbonate added needs to be precisely controlled to ensure complete precipitation of lithium ions and high purity of lithium carbonate.
The process is long, but also need to consume additional sulfuric acid, through freezing crystallization to obtain high lithium and low sodium frozen mother liquor, although the sodium sulfate impurities contained in the mother liquor have a certain impact on the product, but compared with the direct evaporation crystallization of the mother liquor deprecipitation lithium obtained lithium carbonate product quality has a greater degree of improvement.
Third, the advantages of frozen crystalline mother liquor sodium carbonate lithium precipitation
The mother liquor sodium carbonate lithium precipitation method has the advantages of simple operation, good separation effect and low cost. It is widely used in industry, especially when handling large quantities of lithium-containing solutions, to achieve efficient and economical lithium extraction.
At the same time, the method can also be applied to other raw materials containing lithium, such as ore, salt lake brine, etc.
Overall, the mother liquor sodium carbonate precipitation is an important chemical process method for extracting lithium from solutions containing lithium. Efficient separation and purification of lithium can be achieved through frozen crystallization and precipitation of sodium carbonate. This method has a wide range of application prospects in the industry and provides important technical support for the development and utilization of lithium resources.