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Method for extracting lithium from high-calcium lithium-containing raw material

A raw material, high-calcium technology, applied in the direction of lithium halide, calcium/strontium/barium sulfate, sustainable manufacturing/processing, etc., can solve the problems of safety risks, complicated operation steps, high production costs, etc., and achieve low price and easy operation Safety and low production cost

Pending Publication Date: 2022-02-01
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation steps of this method are complicated; multiple heating is required, and the energy consumption is high; liquid caustic soda, soda ash, and hydrochloric acid need to be used multiple times, which also pollutes the environment; carbon dioxide must be introduced separately for decalcification and carbonization, and there are safety risks in the operation; high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Calcium precipitation: The raw material high calcium lithium solution used in this example consists of: Ca 2+ 11.93g / L, Li +0.79g / L; Take 10.0kg of the high-calcium-lithium-containing solution and add it to a crystallizer with a volume of 10L, and then add 2.45kg of sodium sulfate solution with a mass concentration of 20%; the flow rate of the high-calcium-lithium-containing solution is 111g / min , The flow rate of sodium sulfate solution is 28g / min, and the crystallizer reaction zone speed is 12r / min; after the reaction is completed, calcium sulfate crystals are precipitated; the solid-liquid separation is carried out by suction filtration with a circulating water vacuum pump, and the solid in the funnel is 0.599kg , the average value of the solid particle size is 280 μm, and the median value is 300 μm, that is, the crystallized solid particles are large, the entrainment of the mother liquor is small, and the loss of lithium is small; the lithium-containing mother l...

Embodiment 2

[0030] (1) Calcium precipitation: The raw material high calcium lithium solution used in this example is composed of: Ca 2+ 18.04g / L, Li + 0.83 g / L. Take 10.0kg of the high-calcium-lithium-containing solution and add it to a crystallizer with a volume of 10L, and then add 2.0kg of a 30% sodium sulfate solution; the flow rate of the high-calcium-lithium solution is 166g / min, and the sodium sulfate solution is added The flow rate of the crystallizer is 33g / min, and the speed of the reaction zone of the crystallizer is 15r / min; after the reaction is completed, calcium sulfate crystals are precipitated; the solid-liquid separation is carried out by suction filtration with a circulating water vacuum pump, and the solid obtained in the funnel is 850g, and the average particle size of the solid is 268μm , the median value is 285 μm, that is, the crystallized solid particles are large, the entrainment of mother liquor is small, and the loss of lithium is small; in the suction filter ...

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Abstract

The invention relates to a method for extracting lithium from a high-calcium lithium-containing raw material, which comprises the following steps: (1) calcium precipitation: adding the calcium-containing lithium-containing raw material into a reaction container, adding a calcium precipitator, stirring to generate calcium sulfate crystals, and carrying out solid-liquid separation to obtain a decalcified lithium-containing mother solution; (2) nanofiltration: carrying out nanofiltration on the decalcified lithium-containing mother liquor obtained in the step (1) through a nanofiltration system to further decalcify and remove other ions greater than or equal to 2 so as to obtain lithium-containing filtrate; and (3) evaporating and concentrating: evaporating and concentrating the lithium-containing filtrate obtained in the step (2) to obtain a lithium-rich concentrated solution. The method has the advantages of simple operation steps, mild working conditions, low energy consumption, safe operation and less environmental pollution; and the whole operation process is carried out according to safe, energy-saving and environment-friendly conditions. The method is suitable for extracting lithium from various calcium-containing and lithium-containing raw materials, is low in production cost, and is particularly suitable for extracting lithium from high-calcium and lithium-containing raw materials.

Description

technical field [0001] The invention relates to a method for extracting lithium from lithium-containing raw materials, in particular to a method for extracting lithium salt from high-calcium lithium-containing raw materials. Background technique: [0002] Lithium is an important strategic resource and one of the indispensable raw materials for modern high-tech products. [0003] Lithium chloride is a kind of lithium compound, which can be used to make dry batteries and metal lithium. In industry, it is mainly extracted from lepidolite, spodumene, and brine after extracting sodium chloride and potassium chloride. If the calcium content in the lithium raw material is high, the quality of the lithium-precipitated product will be affected. Therefore, calcium needs to be removed before obtaining a lithium-rich solution. [0004] CN 109735709A disclosed on May 10, 2019 a method for reclaiming lithium from calcium-removing magnesium slag and preparing a ternary precursor material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04C01F11/46
CPCC01D15/04C01F11/46Y02P20/10
Inventor 杨三妹蒋世鹏甘顺鹏孙成高李昱昀胡勇季荣王兴平李红艳娄金东周明郑贤福
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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