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Preparation technology for extracting lithium element from lithium ore by virtue of sulfuric acid direct dipping process

A preparation process and a technology for extracting lithium, applied in the directions of aluminum sulfate, alkali metal sulfite/sulfite, aluminum sulfur compound, etc., can solve the problems of high energy consumption and poor environmental protection, improve production efficiency and avoid energy consumption high effect

Active Publication Date: 2017-11-14
成都茂岩矿业有限责任公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation process for extracting lithium and other elements in lithium ore by direct leaching of sulfuric acid to solve the problems of high energy consumption and poor environmental protection caused by the existing roasting method. The process of the present invention can not only be applied to Various types of lithium ores, lithium ores with different lithium contents, but also the separation of other valuable elements

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  • Preparation technology for extracting lithium element from lithium ore by virtue of sulfuric acid direct dipping process

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Embodiment 1

[0045] Such as figure 1 As shown, the preparation process for extracting lithium and other elements from lithium ore by sulfuric acid direct leaching method includes the following steps:

[0046] 1) Raw material pretreatment: Grind lithium ore (lepidolite ore) into granules, use a 200-mesh sieve to sample and inspect, check the approximate ratio of granular material thickness, and make the mesh number reach more than 85% of 200-mesh;

[0047] 2) Sulfuric acid leaching: Put 1200kg of granular lithium ore, 1700kg of sulfuric acid and 3000kg of water obtained in step 1) into the reactor at a mass ratio of 1.2:1.7:3, and add 1.2kg of catalyst. The catalyst is fluorspar fine powder and Sodium fluoride is mixed according to a mass ratio of 3:1, and reacted for 6-8 hours at a reaction temperature of 120°C-150°C and a reaction pressure of 0.04MPa-0.05MPa to obtain lithium, potassium, sodium, rubidium, and cesium. The sulphate solution is cooled to about 95°C and filtered to obtain the lea...

Embodiment 2

[0063] The difference between this embodiment and embodiment 1 is that lithium is separated to prepare lithium carbonate: a): The filtrate obtained in step 3) is adjusted to pH 10.5 with alkali mixed with raw and slaked lime in a ratio of 1:1, and the mother liquor and gypsum are separated. b): Concentrate the solution in step a) so that the lithium ion concentration in the solution is 45g / L, c): concentrate the mother liquor, add an appropriate amount of polyacrylamide to remove calcium according to the calcium ion content of the solution under stirring, and filter after 20 minutes Separate the solution to obtain the filtrate, turn on the stirring again, measure the free amount of the solution (unit: g / L), add an appropriate amount of EDTA to remove impurities, filter and separate the solution to obtain the filtrate; d): add to the filtrate obtained in step c) Sodium carbonate, stand for 100 minutes at 120°C, filter and separate to obtain crude lithium carbonate, after the fina...

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Abstract

The invention discloses a preparation technology for extracting a lithium element from a lithium ore by virtue of a sulfuric acid direct dipping process. The preparation technology comprises the following steps: 1) grinding the lithium ore into particles; 2) carrying out sulfuric acid leaching, namely putting the particular lithium ore obtained in the step 1), sulfuric acid and water into a reaction kettle in proportion, adding sodium fluoride as a catalyst, reacting for 6-8 hours, and cooling, so that a leached material is obtained; 3) sequentially separating other elements in the leached material, and reserving filtrate; and 4) separating lithium from the filtrate obtained in the step 3) and preparing lithium carbonate. The preparation technology disclosed by the invention has the advantages that the problems of high energy consumption and poorer environmental friendliness of an existing roasting method are solved and the preparation technology can be applicable to different types of lithium ores.

Description

Technical field [0001] The invention relates to the technical field of extracting lithium products from lithium ore, in particular to a preparation process for extracting lithium element from lithium ore by a sulfuric acid direct leaching method. Background technique [0002] There are different types of lithium ore, and their physical and chemical properties and impurity content vary greatly. Therefore, the processes for extracting lithium carbonate are also different. Traditional lithium mining mainly extracts lithium products from pegmatite-type lithium ore through high energy consumption and chemical recovery processes, that is, through crushing, beneficiation, high-temperature roasting decomposition at 1100°C, sulfuric acid at 250°C to form sulfate, and alkali filtration to form lithium carbonate . At present, sulfuric acid roasting method, sulfate roasting method and limestone roasting method are mainly used. The limestone roasting method and the sulfate roasting method h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01B33/18C01F7/76C01D5/00
CPCC01B33/18C01D5/00C01D15/08C01F7/762C01P2006/80
Inventor 陈庆新周宇
Owner 成都茂岩矿业有限责任公司
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