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Method for preparing lithium carbonate by extracting lithium salt from aluminium electrolytic high-lithium electrolyte waste

An electrolyte, aluminum electrolysis technology

Inactive Publication Date: 2018-09-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have the disadvantages of low product purity, narrow range of raw material sources and high cost in the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing lithium carbonate by extracting lithium salt from aluminum electrolysis high-lithium electrolyte waste, the method specifically includes the following steps:

[0039] Step 1, using aluminum electrolysis high-lithium electrolyte waste as raw material to prepare lithium sulfate solution; the process of preparing lithium sulfate solution includes successive crushing and screening and acid leaching, as follows:

[0040] Step 1.1, crushing and screening: put the high-lithium electrolyte waste from aluminum electrolysis into a jaw crusher for coarse crushing, and then perform ball milling and screening in turn until the high-lithium electrolyte with a particle size of less than 200 mesh accounts for 65%;

[0041] Step 1.2, acid leaching: mix the crushed and screened high-lithium electrolyte with a sulfuric acid solution with a concentration of 5% at a solid-to-liquid ratio of 1:2, and react at 90°C for 0.5h after mixing to generate a lithium sulfate solu...

Embodiment 2

[0049] A method for preparing lithium carbonate by extracting lithium salt from aluminum electrolysis high-lithium electrolyte waste, the method specifically includes the following steps:

[0050] Step 1, using aluminum electrolysis high-lithium electrolyte waste as raw material to prepare lithium sulfate solution; the process of preparing lithium sulfate solution includes successive crushing and screening and acid leaching, as follows:

[0051] Step 1.1, crushing and screening: Put the aluminum electrolysis high-lithium electrolyte waste into a jaw crusher for coarse crushing, and then perform ball milling and screening in turn, and sieve until the high-lithium electrolyte with a particle size of less than 200 mesh accounts for 75%;

[0052] Step 1.2, acid leaching: mix the crushed and screened high-lithium electrolyte with a sulfuric acid solution with a concentration of 5% at a solid-to-liquid ratio of 1:2, and react at 95°C for 1.5 hours after mixing to generate a lithium s...

Embodiment 3

[0060] A method for preparing lithium carbonate by extracting lithium salt from aluminum electrolysis high-lithium electrolyte waste, the method specifically includes the following steps:

[0061] Step 1, using aluminum electrolysis high-lithium electrolyte waste as raw material to prepare lithium sulfate solution; the process of preparing lithium sulfate solution includes successive crushing and screening and acid leaching, as follows:

[0062] Step 1.1, crushing and screening: put the aluminum electrolysis high-lithium electrolyte waste into a vertical impact crusher to coarsely crush it into particles below 10mm, then ball mill in a ball mill for 4 hours, and then pass through a 200-mesh sieve, the particle size is less than 200 mesh high Lithium electrolyte accounts for more than 70%;

[0063] Step 1.2, acid leaching: mix the crushed and screened high-lithium electrolyte with a sulfuric acid solution with a concentration of 6% at a solid-to-liquid ratio of 1:3, and react a...

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Abstract

The invention discloses a method for preparing lithium carbonate by extracting lithium salt from aluminum electrolytic high-lithium electrolyte waste, which specifically comprises the following stepsof S1, taking the aluminum electrolytic high-lithium electrolyte waste as a raw material to prepare a lithium sulfate solution; S2, filtering the lithium sulfate solution prepared in S1 to obtain filter residue and filter liquor, returning the obtained filter residue to an aluminum electrolytic cell to be used as aluminum electrolyte, and enabling the obtained filter liquor to be standby for lateruse; S3, performing impurity removal, lithium precipitation and secondary filtering to obtain crude lithium carbonate for later use; S4, washing and drying the crude lithium carbonate prepared in theS3 to obtain a lithium carbonate finished product. By taking the aluminum electrolytic high-lithium electrolyte waste as the main raw material to produce the lithium carbonate product, the more expensive and scarce lithionite is replaced, so that the dependence of the lithium-electric energy materials in China on the lithionite is reduced, and the production cost of lithium carbonate is greatly reduced; the obtained filter residue are returned to the electrolytic cell for use, the lithium concentration of the original electrolyte is reduced, the property of the electrolyte is optimized, and the energy is saved.

Description

technical field [0001] The invention relates to the technical field of lithium carbonate preparation methods, in particular to a method for preparing lithium carbonate by extracting lithium salt from aluminum electrolysis high-lithium electrolyte waste. Background technique [0002] In recent years, with the rapid development of the aluminum industry, the demand for bauxite has increased significantly. As a modified component of aluminum electrolyte, lithium salt is more and more favored by the aluminum industry. Adding a certain amount of lithium salt can significantly reduce the primary crystal temperature of the electrolyte, increase its electrical conductivity, reduce its vapor pressure and density, and greatly improve the aluminum electrolysis process. The effect of energy saving and consumption reduction is obvious. In the survey of some aluminum plants, the lithium content of the electrolyte used is generally concentrated at 2.5-4%. However, because the alumina in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C25C3/18
Inventor 王维陈位杰刘海涛韩超刘海洋
Owner HENAN UNIV OF SCI & TECH
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