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Method for selectively leaching nitric acid from lithium element in aluminum electrolyte

An aluminum electrolyte and selective technology, which is applied in the purification of aluminate/alumina/aluminum hydroxide and the improvement of process efficiency, etc., can solve the difficulty of separating lithium salt from other components, increase acid consumption, and increase production costs To achieve the effect of expanding the supply of lithium salt resources, reducing production costs, and improving the overall level

Active Publication Date: 2018-05-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the lithium salt in the aluminum electrolyte can be leached by nitric acid solution, but this leaching method will not only leach the lithium salt, but also leach all the components in the aluminum electrolyte, so that not only increases the acid consumption, Moreover, it is difficult to separate the subsequent lithium salt from other components, resulting in a substantial increase in production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take 10g of aluminum electrolyte (the content of LiF in the electrolyte is 5%), and obtain aluminum electrolyte powder by crushing, grinding, and sieving through an 80-120 mesh sieve, and prepare 100ml of acid solution with nitric acid and distilled water, and the pH of the acid solution is 3. The potential is 0.05V, put the aluminum electrolyte powder into the above acid solution, heat to 60°C, stir with a magnetic stirrer, control the solution potential, pH value and fluoride ion concentration, when the solution pH value is 4, When the fluoride ion concentration is 2g / L, the leaching ends. The reacted mixed solution is filtered and washed to obtain the reacted primary filtrate and primary filtrate.

[0047] After analysis and detection, the dissolution rate of LiF converted from lithium salt in the electrolyte is 99%, and the dissolution rate of the electrolyte is 8%.

Embodiment 2

[0049] Take 500g of aluminum electrolyte (the content of LiF in the electrolyte is 7%), after crushing, grinding, and sieving through an 80-120 mesh sieve, aluminum electrolyte powder is obtained, and 1L of acid solution is prepared with nitric acid and distilled water, and the pH of the acid solution is 2. The potential is 0.1V. Put the aluminum electrolyte powder into the above acid solution, heat to 70°C, stir with a magnetic stirrer, and control the solution potential, pH value and fluoride ion concentration. When the solution pH value is 1, When the fluoride ion concentration is 50g / L, the leaching ends. The reacted mixed solution is filtered and washed to obtain the reacted primary filtrate and primary filtrate.

[0050] After analysis and detection, the dissolution rate of LiF converted to lithium salt in the electrolyte is 90%, and the dissolution rate of the electrolyte is 10%.

Embodiment 3

[0052] Take 10kg of aluminum electrolyte (the content of LiF in the electrolyte is 4%), obtain aluminum electrolyte powder by crushing, grinding, and sieving through an 80-120 mesh sieve, and prepare 100L acid solution with nitric acid and distilled water. The pH of the acid solution is 2. The potential is 0.015V. Put the aluminum electrolyte powder into the above acid solution, heat to 85°C, stir with a magnetic stirrer, and control the solution potential, pH value and fluoride ion concentration. When the solution pH value is 4, When the fluoride ion concentration is 30g / L, the leaching ends. The reacted mixed solution is filtered and washed to obtain the reacted primary filtrate and primary filtrate.

[0053] After analysis and detection, the dissolution rate of LiF converted to lithium salt in the electrolyte is 80%, and the dissolution rate of the electrolyte is 6%.

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Abstract

The invention discloses a method for selectively leaching nitric acid from lithium element in aluminum electrolyte, and relates to the technical field of aluminum electrolyte extraction recycling. Themethod comprises the following steps that 1, aluminum electrolyte containing the lithium element is smashed and screened; 2, nitric acid and water are mixed, the pH value of the acid solution is adjusted to be smaller than 4, and the electric potential is adjusted to be between 0.015V and 0.8V; 3, the aluminum electrolyte is added into the acid solution, stirred, heated and leached, the reactiontemperature is 20-85 DEG C, the adding amount of aluminum electrolyte is controlled according to the concentration and acidity of fluorinion in the solution, the acidity pH value is smaller than 4, and the fluorinion concentration is larger than 1g / L; 4, the mixed solution is filtered and washed to obtain filtrate and filter matter; and 5, the filtrate is used for extracting the lithium element, the filter matter is washed, dried and returned to an aluminum electrolyte plant to produce aluminum electrolyte and / or retuned to a leaching process. Lithium salt is selectively leached, high-additional-value lithium salt is recycled, industrial aluminum electrolyte high in purity and applicable to aluminum electrolyte production is obtained, and the energy consumption and extraction cost for aluminum electrolyte production are low.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolyte extraction and recovery, and relates to a method for selectively leaching lithium elements in aluminum electrolytes by using nitric acid. Background technique [0002] With the rapid development of my country's electrolytic aluminum industry, the demand for bauxite resources has increased sharply. my country's high-grade bauxite is already facing depletion, and only a large amount of low-grade bauxite is mined and utilized to produce metallurgical-grade alumina. This medium and low-grade bauxite contains a large amount of alkali metal elements, especially the bauxite in the main production areas of bauxite in my country has a high content of lithium salt. A large amount of alumina containing lithium salts is used as a raw material for electrolytic aluminum production, which leads to changes in the electrolyte composition in the aluminum electrolytic cell, and a large amount of lithiu...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/06C01F7/46C25C3/18
CPCC22B3/065C22B26/12C25C3/18C01F7/46Y02P10/20
Inventor 王兆文
Owner NORTHEASTERN UNIV
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