Lithium salt lake sedimentary deposits are an important source of lithium in the United States, Chile, the Soviet Union, our country and Bolivia, these resources are very rich. The extraction of lithium from the deposited lithium deposit is by chemical or chemical-flotation combination.
As early as 1936, the United States used a chemical-flotation process to produce lithium salts from the Sears Lake brine. Sears Lake is located in California, USA. Its brine contains various valuable elements such as potassium, sodium, boron and lithium. Lithium is recovered as a by-product. The main process of the process is: pumping the brine to the preheater and heating it to 50 ° C, and then sending it to a digester with strong circulation and convection. The temperature of the digester is 500 ° C in one chamber and 85 ° C in two chambers. Three chambers at 120 °C. After cooking, KCl, Na 2 CO 3 , Na 2 SO 4 and Li 2 NaPO 4 are crystallized from the brine, followed by hydraulic classification. The KCl crystal is coarse and enters the underflow, Na 2 CO 3 •Na 2 SO 4 and Li 2 NaPO 4 It enters the overflow in suspension and is concentrated and filtered into the filter cake. Thereafter, the filter cake was adjusted to a thick slurry, which was treated with a fatty acid and then dissolved by a hot alkali. As a result, most of Na 2 CO 3 •Na 2 SO 4 was dissolved, and the surface of the Li 2 NaPO 4 crystal was insoluble due to the coverage of the fatty acid soap, and was added to the slurry. The foaming agent was passed through the air, Li 2 NaPO 4 was foamed in a flotation machine, and the tailings were further processed to recover soda. The foam concentrate is fed to the sedimentation tank and heated to 60 ° C, and the Na 2 CO 3 •Na 2 SO 4 is dissolved again, and finally filtered and dried to obtain a lithium concentrate containing 020-22% of Li 2 , and the recovery rate is 90. %.
Another process is the chemical method, which means that the brine is evaporated on the drying field, the sodium salt and the potassium salt are precipitated, the lithium chloride concentration is increased to about 6%, and then it is sent to the factory to convert the lithium chloride by the soda ash method. A solid product of lithium carbonate.
4 Bolt Hole Self-aligning Mounting Flanges
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