The salt lake that was developed earlier in the world and gradually reached modern production is the Hills Lake in the United States. Recently, the US Bureau of Minerals studied the possibility of producing lithium carbonate by the dissolution mining method, and proposed a process for extracting lithium directly from the salt lake brine by using an organic solvent.
The Qinghai Salt Lake Research Institute conducted research on the Dongtai Jinnail Salt Lake in Qinghai Province, and successfully studied the new technology of salt lake lithium salt extraction, which made China a major breakthrough in the extraction of lithium from the typical high magnesium lithium salt lake brine. In Qinghai Dongtai Ji Nai Seoul salt Lake built area of nearly 120,000 m2 of salt, lithium carbonate to achieve an annual production capacity of 100t, and comprehensive recovery of potassium sulfate, boric acid and other by-products of Light magnesium carbonate. ISL Institute also Dachaidan Salt Lake sun concentrated MgCl2 saturated brine pilot test were extracted directly with LiCl tributyl phosphate solvent extraction, separation, and extraction rate of 80% or more, a product purity Grade requirements. Currently, the Institute is preparing from Qinghai potash fertilizer plant two concentrated brines mention the old industrial test lithium, which is important for solving lithium salt lake resources, metal recycling and comprehensive utilization and industrial development of China lithium. The Salt Lake Center of the Chinese Academy of Geological Sciences studied the Zabuye Salt Lake in Tibet and used the water immersion-carbonization-pyrolysis and water immersion-carbonation leaching-precipitation process to effectively remove various impurities and obtain Li2CO3 products in line with the national standard. Chengdu University of Technology Research TiO2 as synthesized from partial titanate type lithium ion memory exchanger, of Li + selectivity, exchange capacity nearly 30mg (Li) / g (TiO2 ), the exchanger is adapted to the low concentration of the Lithium . Most of the ion exchangers with good adsorption performance are powders. Due to the poor fluidity and permeability of the powders, industrial applications are difficult and need to be granulated for operation, but the granulation of ion sieves is difficult, and Studies have found that the performance of the exchanger after granulation will decrease, and all granulation work is still in the experimental stage.
Solvent extraction and adsorption methods are mainly used in the study of lithium extraction from seawater. The Institute of Marine Resources and Environment of the Japanese Administrative Consortium Institute of Lithium Manganese Oxide has a maximum adsorption capacity of lithium of 7.8 mg/g, Li1.33Mn1.67O4 with a maximum adsorption capacity of lithium of 25.5 mg/g, and Li1.6Mn1.6O4 for lithium. The maximum adsorption amount is 40 mg/g. The equilibrium adsorption capacity of lithium oxide LiMn2O4 synthesized by Wuhan University is 4.99mmol·(1L, 0.1M LiCl) [34,35]. Some progress has been made in the research of lithium extraction equipment for seawater. The Japanese patent proposes a seawater lithium lifting device for ships, that is, a granular adsorbent is filled in the pressurized water tank of the ship, and the seawater enters the adsorption bed water tank from the opening of the bilge with the check valve, and passes through the adsorbent bed to reach the upper part thereof. The seawater is discharged from the hull by a drain pump designed on the right side of the ship's side.
Leaf made from strong spodumene ore comprehensive recovery tantalum and niobium and cassiterite, by increasing the separation process reselection before with spodumene flotation, niobium and tantalum may be recovered only cassiterite, may remove most of the iron ore magnet, Conducive to the selection of spodumene. Liao Minghe proposed heavy liquid separation of spodumene. This method can understand the particle size of the target mineral at different crushing sizes and the particle size separated from the gangue, so that the preliminary evaluation of the selectivity can be quickly made. AB Sosa conducted a study on the Portuguese spodumene ore. The results of the test indicated that the heavy medium ore dressing (HMS) and flotation were used to conduct a graded ore sample (4.75-2.0 mm) with a Li2O content of 2.5%. In the HMS test, glass grade spodumene containing 5% Li2O was obtained in the precipitate product. The flotation test was carried out on the desliming ore of 300-75 μm. However, only the content of Li2O in the ore was more than 1.5% to obtain a commercial grade concentrate. A concentrate of 7.75% Li2O grade was obtained from a feed containing 2% Li2O. The Guangzhou Institute of Nonferrous Metals conducted a comprehensive utilization study of the 呷jika spodumite mine in Sichuan Province, using the “original ore flotation enrichment of spodumene and strontium-flotation concentrates to obtain spodumene concentrate and strontium by magnetic-heavy combined process. The beneficiation process of strontium concentrate-flotation tailings recovery feldspar has better solved the recovery of spodumene and antimony ore and the comprehensive utilization of feldspar. When the ore contains Li2O 1.48%, Ta2O5 0.006%, Nb2O5 0.013%, the lithium concentrate contains Li2O 5.96%, the recovery rate is 87.74%; the high grade antimony concentrate contains Ta2O5 and Nb2O5 respectively 14.13%, 19.66%, respectively. 27.42%, 17.69%; low grade antimony concentrate containing Ta2O5, Nb2O5 were 1.53%, 2.28%, respectively, the recovery rate was 9.70%, 6.73%; the total concentrate of tantalum concentrate contained Ta2O5, Nb2O5 were 4.42%, 6.27 respectively. %, the recovery rates were 37.13% and 24.42%, respectively. The feldspar concentrate with a yield of 63.64% of the original ore is obtained by directly removing the iron from the lithium flotation tailings by strong magnetic separation. Ma Binxia discussed the neutralization mechanism of acid clinker leaching during the process of producing lithium carbonate by spodumene-sulfuric acid method. It was proved by experiments that there was a reversible reaction in the process of leaching neutralization of lithium carbonate by sulfuric acid-sulfuric acid process. Similarly, under alkaline or neutral conditions, the leaching neutralization process also has a reversible reaction.
Xinjiang Keketuohai beryllium ore vein 3, in the comprehensive recovery of valuable mineral ore using lithium beryllium flotation separation process again, concentrate 1200t expected recovery beryllium, lithium ore 5000t. Liu Liuhui et al. studied the high-fluorine high-magnesium beryl flotation fine ore. The test shows that the flotation powder ore pretreatment process is added on the basis of the original process flow, and after industrial defluorination, the industrial yttrium oxide is produced by the sulfuric acid method. Quality can meet national standards. Li Wei et al. conducted a new study on the defluorination process of Shuikoushan No.6 Plant, and discussed the feasibility of separating fluorine by subsequent wet process without pretreatment of high-fluorine ore with sulfuric acid and all the fluorine in the ore entering the leachate. Sexuality, research shows that when the ore F/BeO=20%-40%, the precipitation separation method can control the F/BeO=10%-12% of cerium oxide, and the cerium hydroxide can be removed by aluminum and alkali. The impurity Al2O3 in the product is required to reach less than 0.7%.
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