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Method for extracting lithium carbonate from sodium aluminate solution in alumina factory

A kind of technology of alumina plant and alumina, which is applied in the direction of lithium carbonate; The effect of easy quality control, simple process, and strong product market competitiveness

Active Publication Date: 2019-05-10
开曼铝业(三门峡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] It can be seen from Table 1 that Li in the products of alumina factories in central my country 2 O is generally high, usually imported alumina Li 2 O is only 0.006%. If it is estimated at 0.1%, the alumina production is estimated at 12 million tons / year, and the Li 2 O is as high as 12,000 tons. These lithium resources have not been rationally utilized. What's more, the lithium enrichment in the electrolyte of the electrolysis plant that uses lithium-rich alumina as raw material for a long time exceeds a reasonable range, which leads to the deterioration of the working conditions of the electrolysis cell, which in turn has to be limited Lithium-rich alumina
[0012] After checking the relevant literature at home and abroad, there is no report on the extraction of lithium from the sodium aluminate solution in the alumina factory

Method used

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  • Method for extracting lithium carbonate from sodium aluminate solution in alumina factory
  • Method for extracting lithium carbonate from sodium aluminate solution in alumina factory
  • Method for extracting lithium carbonate from sodium aluminate solution in alumina factory

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Effect test

Embodiment 1

[0052] The method for extracting lithium carbonate from sodium aluminate solution in an alumina plant, the process flow chart is shown in 5, including:

[0053] 1. Use the semen of an alumina factory, the semen contains Nk=160g / L, Rp=1.08, Li + = 0.035g / L, temperature 75°C, add aluminum hydroxide seed crystal 2g / L, stir for 4 hours, separate aluminum hydroxide once, and return the semen to the Bayer factory. After testing, basically no Li can be detected in the semen after lithium precipitation + , indicating that the lithium precipitation reaction is relatively thorough.

[0054] 2. High-lithium primary aluminum hydrogen is washed twice in countercurrent with 2 times hot water. After washing, the aluminum hydrogen is beaten with 5 times hot water. It is soaked in a reactor at 200°C for 1 hour, and the slurry is separated after leaching.

[0055] 3. Redissolve hydrated alumina with Nk=242g / L, Rp=0.516 circulating mother liquor, temperature 220°C, time 30 minutes, RP=1.15 afte...

Embodiment 2

[0059] The method for extracting lithium carbonate from the sodium aluminate solution in an alumina plant, the process flow chart is shown in 6, including:

[0060] 1. Use the semen of an alumina factory, the semen contains Nk=160g / L, Rp=1.08, Li + = 0.035g / L, temperature 75°C, add aluminum hydroxide seed crystal 2g / L, stir for 4 hours, separate aluminum hydroxide once, and return the semen to the Bayer factory. After testing, basically no Li can be detected in the semen after lithium precipitation + , indicating that the lithium precipitation reaction is relatively thorough.

[0061] 2. Evaporate the mother liquor, containing Nk=175g / L, Rp=0.516, redissolve the aluminum hydrogen once, and make the ingredients according to the dissolved Rp=1.15, use the reactor to dissolve for 30 minutes at 220°C, adjust the dissolved semen to Nk=150g / L , lower the temperature to 75°C, add aluminum hydroxide seed crystal 2g / L, carry out a stage of decomposition, a period of decomposition time...

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Abstract

The invention relates to a method for extracting lithium carbonate from a sodium aluminate solution of an aluminum oxide factory. Dissolved lithium in a refined liquid of the aluminum oxide factory is extracted and prepared into a lithium carbonate product, resources are completely not scrambled with the existing lithium carbonate industry, and high-efficiency, low-pollution and low-cost extraction of lithium is realized, so that a feasible technical route for comprehensively utilizing resources and improving economic benefit is provided for the aluminum oxide factory using high-lithium bauxite all over China. The provided lithium carbonate production method is essentially different from an existing extraction method taking spodumene and salt lake brine as raw materials, and a lithium source is lithium in aluminum ores entering a sodium aluminate solution during a digestion reaction in a process of producing alumina by virtue of a Bayer process or sintering process and equivalent to a byproduct of aluminum oxide production.

Description

technical field [0001] The invention relates to a method for extracting high-value-added lithium salt from alumina semen produced by Bayer method or sintering method, which belongs to the technical field of inorganic chemical industry. Background technique [0002] Lithium carbonate, an inorganic compound with the formula Li 2 CO 3 , as colorless monoclinic crystals or white powder. Density 2.11g / cm 3 , Melting point 618℃, soluble in dilute acid, slightly soluble in water, more soluble in cold water than hot water, insoluble in alcohol and acetone. Widely used in batteries, ceramic glass, lubricants, pharmaceuticals and other industries. [0003] Lithium carbonate is the basic material for the production of secondary lithium salts and lithium metal products, so it has become the most used lithium product in the lithium industry, and other lithium products are basically downstream products of lithium carbonate. The production process of lithium carbonate can be divided i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 马海军陈兆元陈兵赵俊葛新博袁向阳
Owner 开曼铝业(三门峡)有限公司
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