Method for producing lithium hydroxide from lithium-containing low-magnesium brine in form of lithium phosphate
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A lithium hydroxide and lithium phosphate technology, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problems of reducing electrolysis production capacity, increasing electrolysis cost, and high concentration
Inactive Publication Date: 2021-02-02
YIDING SHANGHAI INFORMATION TECH CO LTD
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But the concentration of sodium ion and potassium ion is high in the lithium chloride solution before this method electrolysis, produces a lot of sodium hydroxide and potassium hydroxide in the electrolysis process, and like this one is to reduce electrolysis production capacity, has increased electrolysis cost, and the 2nd, has increased The cost and difficulty of producing battery-grade lithium hydroxide products from a mixed solution of lithium hydroxide, sodium hydroxide and a small amount of potassium hydroxide
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Embodiment 1
[0052] The composition of the brine in Zabuye Salt Lake in Tibet is shown in Table 1. The pH value of the salt lake brine is 9.2 and the density is 1.24g / cm 3 .
[0053] Table 1 The brine composition of Zabuye Salt Lake
[0055] Take 100L of the salt lake brine sample, add lithium hydroxide mother liquor to adjust the pH to 11, filter and remove the resulting precipitate, and obtain the brine sample after calcium and magnesium removal, and use plasma inductively coupled atomic emission spectrometry (ICP) to analyze the lithium in it The concentration was 0.79g / L, and the calcium and magnesium content was analyzed at the same time. The Mg and Ca in the solution were both lower than the ICP-AES inspection limit, indicating that calcium and magnesium had been c...
Embodiment 2
[0061] The main composition of an underground brine in Jiangxi is (g / L): Li + , 0.097; Mg 2+ , 0.929; Na + , 120.6; K + , 0.421; Ca 2+ , 4.045; Cl - , 196.7, use the adsorption method of aluminum-based adsorbent to remove magnesium and concentrate lithium to prepare a desorption solution containing lithium and low magnesium. The main composition of the desorption solution is (g / L): Li + , 0.23; Mg 2+ , 0.004; Na + , 0.43; K + , 0.002; Ca 2+ , 0.015; Cl - , 1.88, further reverse osmosis of the desorption solution to obtain a concentrated solution containing lithium and low magnesium, the concentrated solution is mainly composed of (g / L): Li + , 2.3; Mg 2+ , 0.04; Na + , 4.3; K + , 0.02; Ca 2+ , 0.15; Cl - , 18.8.
[0062] Take 100L of the above-mentioned concentrated solution, add lithium hydroxide lithium precipitation mother liquor and sodium hydroxide solution to adjust the pH value to 11.5, filter and remove the precipitate produced, and obtain a brine sample...
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Abstract
The invention provides a method for preparing lithium hydroxide from lithium-containing low-magnesium brine in the form of lithium phosphate, and relates to the technical field of salt lake lithium extraction. The method comprises the following steps of: adjusting the pH value of the lithium-containing low-magnesium brine to be more than 10 by adopting an inorganic alkaline compound to precipitatecalcium and magnesium to obtain calcium and magnesium removed lithium-containing brine; adding a phosphoric acid solution to carry out precipitation reaction, centrifuging and washing the obtained lithium phosphate precipitate, and dissolving the lithium phosphate precipitate in a phosphoric acid solution to obtain a lithium dihydrogen phosphate solution; and purifying the lithium dihydrogen phosphate solution, then carrying out bipolar membrane electrodialysis, and concentrating and crystallizing the obtained lithium hydroxide solution to obtain a lithium hydroxide product. The method disclosed by the invention is simple and convenient to operate, high in removal rate of calcium, magnesium, sodium and potassium in the lithium-containing low-magnesium brine, high in material cyclic utilization rate, low in cost, and capable of continuously preparing lithium hydroxide, and the purity of the electrolyzed lithium hydroxide product is improved. The method is particularly suitable for extracting lithium from salt lakes of remote Tibet, Qinghai and South America featuring high raw material transportation cost and low photovoltaic power generation and energy storage cost.
Description
technical field [0001] The invention relates to the technical field of lithium extraction from salt lakes, in particular to a method for preparing lithium hydroxide from lithium-containing low-magnesium brine in the form of lithium phosphate. Background technique [0002] At present, lithium is widely used in various fields such as lithium batteries, glass, ceramics, alloys, lubricants, and medicine. According to the source of lithium resources, it can be divided into brine type and ore type. Lithium extraction from ores is the process of beneficiation, high-temperature calcination, leaching, purification, concentration and precipitation of ores such as spodumene, lepidolite, lithium feldspar and hectorite. These processes require high energy consumption. Lithium extraction from ores The overall cost of lithium extraction from ore is relatively high, and the price of lithium salt for lithium extraction from ore is difficult to further decrease. Unlike ore resources, there ...
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