Method and system for desorbing lithium in lithium-rich adsorbent from alumina factory
An adsorbent and alumina technology, applied in chemical instruments and methods, inorganic chemistry, lithium compounds, etc., can solve problems such as no reports of lithium, unreasonable utilization of lithium resources, and deterioration of electrolyzer working conditions. The effect of low consumption
Active Publication Date: 2019-05-17
开曼铝业(三门峡)有限公司
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[0011] It can be seen from Table 1 that Li in the products of alumina factories in central my country 2 O is generally high, usually imported alumina Li 2 O is only 0.006%. If it is estimated at 0.1%, the alumina production is estimated at 12 million tons / year, and the Li 2 O is as high as 12,000 tons. These lithium resources have not been rationally utilized. What's more, the lithium enrichment in the electrolyte of the electrolysis plant that uses lithium-rich alumina as raw material for a long time exceeds a reasonable range, which leads to the deterioration of the working conditions of the electrolysis cell, which in turn has to be limited Lithium-rich alumina
[0012] After checking the relevant literature at home and abroad, there is no report on the analysis of lithium in the lithium-rich adsorbent of the alumina plant
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[0043] Such as Figure 6 As shown, the embodiment of the present invention provides a system for analyzing lithium in the lithium-rich adsorbent of an alumina factory, including a three-stage countercurrent hydrothermal analysis device, and each stage of the hydrothermal analysis device includes successively connected analytical batching tanks, Hydrothermal reaction unit, slurry buffer tank, analytical slurry filter and filtrate tank.
[0044] The liquid phase inlet ports of the first analysis batching tank 11 and the second analysis batching tank 21 are respectively connected with the second filtrate tank 25 and the third filtrate tank 35 outlets, and the liquid phase inlet of the third analysis batching tank 31 is end connected to clean water; the alumina factory lithium-rich adsorbent to be analyzed is added to the first analysis batching tank 11, and the solid phase inlet ports of the second analysis batching tank 21 and the third analysis batching tank 31 are respectively...
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The invention discloses a method and a system for desorbing lithium in a lithium-rich adsorbent from an alumina factory. The method comprises N times of continuous downstream or countercurrent hydrothermal desorption processes, wherein each hydrothermal desorption process sequentially comprises desorption material preparation, hydrothermal desorption reaction and desorption slurry filtration. Thesystem comprises N stages of downstream or upstream hydrothermal desorption devices, wherein each hydrothermal desorption device comprises a desorption material preparation tank, a hydrothermal reaction unit, a slurry buffer tank, a desorption slurry filter and a filtrate tank which are connected sequentially. The new process is applied to the lithium-rich adsorbent produced by extraction of lithium from a sodium aluminate solution with an adsorption method, and lithium is further desorbed based on the principle of high-temperature and high-pressure hydrothermal leaching; the hydrothermal reaction units adopt full-pipe slurry and slurry heat exchange technologies, so that energy consumption of the whole units is minimized; by means of multiple countercurrent desorption processes, the lithium content in / of an desorption solution is higher than 0.5g / L, and the desorption rate of lithium in the adsorbent is higher than or equal to 90%.
Description
technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method for extracting high value-added lithium salt from the semen of alumina produced by Bayer method or sintering method, in particular to a method for analyzing lithium in lithium-rich adsorbents in alumina factories and system. Background technique [0002] Lithium carbonate, an inorganic compound with the formula Li 2 CO 3 , as colorless monoclinic crystals or white powder. Density 2.11g / cm3, melting point 618℃, soluble in dilute acid, slightly soluble in water, higher solubility in cold water than hot water, insoluble in alcohol and acetone. Widely used in batteries, ceramic glass, lubricants, pharmaceuticals and other industries. [0003] Lithium carbonate is the basic material for the production of secondary lithium salts and lithium metal products, so it has become the most used lithium product in the lithium industry, and other lithium products a...
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Inventor马海军陈兆元陈兵赵俊
Owner开曼铝业(三门峡)有限公司