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Method for treating potassium element in aluminum electrolyte by using acid process

The technology of aluminum electrolyte and element is applied in the field of acid treatment of potassium element in aluminum electrolyte and treatment of potassium sodium cryolite material in aluminum electrolyte, which can solve the problems of reduced service life of electrolytic cells, increased production efficiency, damage of carbon materials, etc. Achieve the effect of low processing cost, increased efficiency and low equipment requirements

Active Publication Date: 2015-03-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the purpose of removing the harmful element potassium in the aluminum electrolyte, the present invention successfully researches the process of treating the aluminum electrolyte containing potassium element by acid method, which solves the problem of high superheat and high degree of superheat in aluminum electrolysis production caused by the existence of potassium element for the aluminum electrolysis industry. A series of problems such as the damage of carbon materials and the reduction of the service life of the electrolytic cell not only increase the production efficiency, but also provide a practical method for the production of electrolytic aluminum in a complex electrolyte system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 10g of aluminum electrolyte, pulverize and grind to a particle size of 100um-150um to obtain aluminum electrolyte powder; mix the aluminum electrolyte powder with 2g sodium fluoride powder and add it to 100ml of HNO 3 In aqueous solution, HNO 3 The concentration of the aqueous solution is 65wt%; the reaction is carried out under stirring and 40℃ for 60min, and the stirring speed is 150r / min. During the reaction, water is added to the reaction solution to keep the total volume unchanged.

[0025] The reacted materials are filtered to obtain the filtrate after the reaction and the filtered solid phase, the filtered solid phase is washed with water until the washing liquid becomes neutral (pH=7.0), and the water is removed by drying to obtain 10.2g cryolite with a purity of 95% or more .

[0026] The filtrate is introduced into the molecular sieve to separate potassium ions and sodium ions; the molecular sieve after adsorption is desorbed, and the desorbed solution is evapo...

Embodiment 2

[0029] Take 5g of aluminum electrolyte, pulverize and grind to a particle size of 100um-150um to obtain aluminum electrolyte powder; mix the aluminum electrolyte powder with 1g sodium fluoride powder and add it to 50ml of HNO 3 In aqueous solution, HNO 3 The concentration of the aqueous solution is 65wt%; the reaction is carried out for 90 minutes under stirring and 60°C, and the stirring speed is 200 r / min. During the reaction, water is added to the reaction solution to keep the total volume unchanged.

[0030] The reacted materials are filtered to obtain the filtrate and filtered solid phase after the reaction, the filtered solid phase is washed with water until the washing liquid becomes neutral (pH=7.0), and the water is removed by drying to obtain 5.11g cryolite with a purity of 95% or more .

[0031] The filtrate is introduced into the molecular sieve to separate potassium ions and sodium ions; the molecular sieve after adsorption is desorbed, and the desorbed solution is evap...

Embodiment 3

[0034] Take 150g of aluminum electrolyte, pulverize and grind to a particle size of 100um-150um to obtain aluminum electrolyte powder; mix the aluminum electrolyte powder with 10g sodium fluoride powder, and add to 1500ml HNO 3 In aqueous solution, HNO 3 The concentration of the aqueous solution is 35wt%; the reaction is carried out for 120min under stirring and 20℃, and the stirring speed is 250r / min. During the reaction, water is added to the reaction solution to keep the total volume unchanged.

[0035] The reacted materials are filtered to obtain the filtrate after the reaction and the filtered solid phase. The filtered solid phase is washed with water until the washing liquid becomes neutral (pH=7.0), and dried to remove water to obtain 152.82g cryolite with a purity of 95% or more .

[0036] The filtrate is introduced into the molecular sieve to separate potassium ions and sodium ions; the molecular sieve after adsorption is desorbed, and the desorbed solution is evaporated an...

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Abstract

The invention discloses a method for treating a potassium element in aluminum electrolyte by using an acid process. The method is characterized by comprising the following steps of (1) adding aluminum electrolyte containing the potassium element into a concentrated acid solution to react, filtering the material after reacting to obtain filtrate and a filtered solid, and drying to remove water in the filtered solid to obtain cryolite; (2) introducing the filtrate to a molecular sieve for adsorbing potassium ions to separate the potassium ions and sodium ions, desorbing the absorbed molecular sieve by using an ammonium nitrate solution, and carrying out evaporative crystallization on the desorbed solution to obtain potassium nitrate; and (3) carrying out evaporative crystallization on the adsorbed filtrate to obtain sodium nitrate. By using the method, a series of problems of superheat, carbon material damage, electrolytic tank service life loss and the like generated in the aluminum electrolysis production process because of the existence of the potassium element in the aluminum electrolysis industry are solved, the production benefit is increased, and a feasible method is provided for realizing electrolytic aluminum production under a complex electrolyte system.

Description

Technical field [0001] The invention relates to a method for treating potassium sodium cryolite in an aluminum electrolyte, in particular to a method for treating potassium in an aluminum electrolyte by an acid method, and belongs to the technical field of inorganic chemistry. Background technique [0002] In recent years, with the rapid development of my country's electrolytic aluminum industry, the demand for bauxite resources has increased sharply. Therefore, a large amount of low- and medium-grade bauxite has been exploited and used to prepare metallurgical grade alumina. This low- and medium-grade bauxite contains a large amount of alkali metal elements, especially the bauxite in the main bauxite-producing areas of my country, which has a relatively high content of potassium. The content of potassium in metallurgical grade alumina prepared from this kind of bauxite can be more than 50 times that of foreign metallurgical grade alumina. A large amount of alumina containing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C01D9/00C25C3/06
CPCC01D9/16C01F7/54
Inventor 王兆文侯剑峰石忠宁高炳亮胡宪伟于江玉张鹏举
Owner NORTHEASTERN UNIV LIAONING
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