Method for preparing lithium hydroxide from lithium-containing low-magnesium brine
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A lithium hydroxide and low-magnesium technology, applied in the field of lithium extraction from salt lakes, can solve the problems of reduced lithium yield, large investment in evaporators and refrigeration equipment, and high energy consumption, achieving low cost, high recycling rate, and transportation costs high effect
Pending Publication Date: 2020-07-10
YIDING SHANGHAI INFORMATION TECH CO LTD
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This method needs to be frozen and then heated and evaporated in the whole production process. Not only the investment in evaporators and refrigeration equipment is large, but the energy consumption is high; At the ...
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Embodiment 1
[0063] The composition of the old brine of Jieze Chaka Salt Lake after drying is shown in Table 1. The pH value of the salt lake brine is 9.0, and the density is 1.23g / cm 3 .
[0064] Table 1 Composition of old brine in Jiezechaka Salt Lake
[0066] Take the old brine of the salt lake, add lithium hydroxide mother liquor to adjust the pH to 11.5, filter and remove the resulting precipitate, obtain a brine sample after calcium and magnesium removal, and use plasma inductively coupled atomic emission spectrometry (ICP) to analyze the lithium concentration in it It was 1.09g / L, and the concentration of sodium ion and potassium ion remained basically unchanged. At the same time, the content of calcium and magnesium was analyzed, and the Mg and Ca in the solution were both lower than the ICP-AES inspection lim...
Embodiment 2
[0072] The main composition of raw brine in Longmu Co Salt Lake in Tibet is (g / L): Li + , 0.13; Mg 2+ , 11.33; Na + ,30;K + , 3; SO 4 2- , 6.42; Ca 2+ , 0.3; Cl - , 78, using 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 + , 0.3; Mg 2+ , 0.3; Na + , 0.2; K + , 0.03; SO 4 2- , 0.17; Ca 2+ , 0.01; Cl - , 3.6, 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 + , 2.1; Mg 2+ , 2.1; Na + , 1.4; K + , 0.21; SO 4 2- , 1.19; Ca 2+ , 0.07; Cl - , 25.2.
[0073] Take the above concentrated solution, add lithium hydroxide lithium precipitation mother liquor and sodium hydroxide solution to adjust the pH to 12.5, filter and remove the generated precipitate, and o...
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Abstract
The invention provides a method for preparing lithium hydroxide from lithium-containing low-magnesium brine, and relates to the technical field of salt lake lithium extracting. The method comprises the following steps: adjusting the pH value of the lithium-containing low-magnesium brine to be more than 10 by adopting an inorganic base to precipitate calcium and magnesium to obtain calcium and magnesium removed lithium-containing brine; extracting lithium in the calcium and magnesium removed lithium-containing brine by adopting an organic extracting agent to obtain raffinate containing sodium and potassium and a lithium-containing loaded organic phase; carrying out reverse extracting on the lithium-containing loaded organic phase by using an inorganic acid solution to obtain a lithium saltsolution; purifying the lithium salt solution and then electrolyzing to obtain a lithium hydroxide solution; and concentrating and crystallizing the lithium hydroxide solution to obtain lithium hydroxide and lithium hydroxide precipitation mother liquor. The method disclosed by the invention is simple and convenient to operate, high in lithium hydroxide product yield, high in purity, high in material cyclic utilization rate, low in cost, capable of continuously preparing the lithium hydroxide, and particularly suitable for extracting lithium from salt lakes of Tibet, Qinghai and South America,which are remote in geographical position, high in raw material transportation cost and low in 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. 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 are dissolved lithium ions in bri...
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