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Process for extracting lithium salt from spodumene by adopting sulfuric acid pressure boiling method

A technology for extracting lithium and spodumene, which is applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of low production efficiency and long process flow, and achieve the effect of reducing production cost and shortening the process route

Active Publication Date: 2014-10-01
江西雅保锂业有限公司
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AI Technical Summary

Problems solved by technology

[0006] Acid to prepare anhydrous lithium nitrate, the traditional process of preparing anhydrous lithium chloride and anhydrous lithium nitrate from spodumene is long and the production efficiency is low

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] A kind of technology that spodumene sulfuric acid pressure cooking method extracts lithium salt comprises the following steps:

[0029] (1) Roasting transformation of spodumene: put spodumene concentrate (Li2O·Al2O3·4SiO2) in an internal heating rotary furnace, and carry out conversion and roasting at high temperature, and the temperature during roasting transformation is controlled at 1150-1250°C. Make it change from α-type to β-type;

[0030] (2) Cooling and grinding: cooling the roasted raw materials in step (1) to normal temperature, and then grinding them to 80-200 meshes;

[0031] (3) Slurry: add sulfuric acid and the finely ground spodumene in step (2) to a corresponding amount of water to prepare a slurry, control the molar ratio of lithium acid to 2 to 7, and the liquid-solid ratio to 3 to 5 (by weight of sulfuric acid into the liquid phase); the ground mineral powder is pulped and boiled with sulfuric acid.

[0032] (4) Pressure immersion: us...

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Abstract

The invention discloses a process for extracting lithium salt from spodumene by adopting a sulfuric acid pressure boiling method. The process comprises the following steps: transforming the spodumene at high temperature, and adding sulfuric acid for pressure boiling to obtain soluble lithium sulfate and insoluble high-silicon residues, and separating lithium from lithium concentrate to further prepare lithium carbonate and obtain a byproduct-high-silicon soil; adding lime for purifying leachate liquid containing a small quantity of aluminum, iron and other alkali metal sulfate, removing impurities in a multi-step way to obtain a high-purity lithium sulfate solution, and carbonizing to generate a lithium carbonate product and a sodium sulfate byproduct. According to the process, the yield is high, the wastewater discharge quantity is low, mother liquor can be recycled, and the cost is low.

Description

[0001] technical field [0002] The invention belongs to the industrial field of extracting lithium from ores, and in particular relates to a process for extracting lithium salts by a sulfuric acid pressure cooking method of spodumene. Background technique [0003] Industrial lithium metal smelting methods are mainly divided into two categories: one is to extract lithium from brine, enrich lithium in brine, and finally transform to produce lithium salt products such as lithium hydroxide monohydrate, lithium carbonate, and lithium sulfate; The method is to extract lithium from the ore, mainly by fire or wet treatment of the lithium-containing ore-spodumene and lepidolite, destroying its original gangue structure, and making the Li in it 2 O is dissolved in the form of soluble lithium salts, and lithium salts such as lithium hydroxide monohydrate, lithium carbonate, and lithium sulfate can be obtained. However, because most of domestic salt lake brines have the characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 张芃郑国忠王荣生黄宗见张克忠高波潘高张洪铭范友富
Owner 江西雅保锂业有限公司
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