The adsorption method is suitable for the comprehensive utilization of lithium resources in old halogen discharged from the production of potassium fertilizer in Qarhan Salt Lake. The high magnesium-lithium ratio (minimum 500:1) emitted by the production of potassium fertilizer is used to extract trace amounts of lithium ions from the old halogen, adsorption of the adsorption resin by selective adsorption capacity, and then de-encipitated from the resin by eluent to form a lithium-containing solution containing a small amount of magnesium ions. The solution is removed by a deep magnesium removal process to obtain a pure lithium solution with only lithium ions.
Qinghai Salt Lake Fozhao Lanke Lithium Industry Co., Ltd. through the use of adsorption method from the old halogen emitted from the potash fertilizer production extraction technology application, has built a 10,000 tons / year lithium carbonate production plant, the device in December 2011 to produce qualified industrial grade high-quality lithium carbonate products, in 2013 production of lithium chloride intermediate raw material liquid 3000 tons.
The project has overcome the separation of high magnesium-lithium ratio (minimum 500:1) in the discharge brine, the study and design of the structure of the adsorption bed, the optimization of process parameters in industrial production, the liquid concentration of reverse osmosis products, the anti-seepage of saltfield and other engineering problems, and realized the continuous industrial production of lithium extraction in salt lake brine, and the products meet the national standards for industrial lithium carbonate. Through the implementation of this project, the industrialization of the world's advanced adsorption method lithium extraction technology is realized, and further applied in the Qarhan Salt Lake, so that the scale of the old halogen lithium extraction in the salt lake reaches 20,000 tons / year in the long run, the comprehensive utilization rate of lithium resources is significantly improved, and the development and utilization of lithium resources in the Qaidam Basin and other salt lakes in China are technically radiated, driving the development of downstream new energy, automobiles, aerospace and other industries.
[This technology is selected from the announcement of the Ministry of Natural Resources on the Catalogue of Advanced and Applicable Technologies for the Conservation and Comprehensive Utilization of Mineral Resources (2019 Edition), and the work supporting unit: China Academy of Natural Resources Economics]
Technical recommendation unit: Qinghai Provincial Department of Natural Resources
Technical declaration unit: Qinghai Salt Lake Industry Co., Ltd
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