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Method for preventing hydrolysis in separation process of bauxite dissolution experiment

A technology for dissolution experiment and separation process, which is applied in the field of preventing hydrolysis in the separation process of bauxite dissolution experiment, and can solve problems such as large data differences and unstable sodium aluminate solution

Active Publication Date: 2021-02-02
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] During the bauxite dissolution experiment, a low molecular ratio sodium aluminate solution (molecular ratio of 1.2-2.0) is formed after the bauxite dissolution. This low molecular ratio sodium aluminate solution is very unstable. During the solid-liquid separation process, aluminum hydroxide will be hydrolyzed, resulting in a large difference between the experimental results and the real bauxite dissolution data

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  • Method for preventing hydrolysis in separation process of bauxite dissolution experiment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Configure sodium aluminate solution hydrolysis inhibitor, the ratio of absolute ethanol, EDTA, mannitol, sodium tartrate and water is 1:1:1:17:80.

[0032] 2) Bauxite Alkali solution is used to dissolve alumina in bauxite, and hydrothermal reaction kettle is used to dissolve alumina, and the temperature of bauxite dissolution is 300°C; bauxite is monohydraulic bauxite.

[0033] 3) After the dissolution, the temperature was lowered to 99° C., the hydrothermal reaction kettle was opened, and a hydrolysis inhibitor with a total volume of 1‰ of the dissolution solution was added to the dissolution solution with a dropper, and stirred.

[0034] 4) Use the solid-liquid separation method of centrifugation for solid-liquid separation and washing to obtain a stable sodium aluminate solution and red mud. The stable sodium aluminate solution has a molecular ratio of 1.2 and is placed at room temperature for 2 hours without hydrolysis. solution.

Embodiment 2

[0036] 1) Configure the sodium aluminate solution hydrolysis inhibitor, the ratio of absolute ethanol, EDTA, mannitol, sodium tartrate and water is 10:10:10:20:50.

[0037] 2) Bauxite Alkali solution is used to dissolve the alumina in the bauxite, and a steel bullet is used to dissolve the alumina. The bauxite dissolution temperature is 120° C.; the bauxite is boehmite-type bauxite.

[0038] 3) After the dissolution, the temperature is lowered to 90°C, the dissolution steel bomb is opened, and a hydrolysis inhibitor with a total volume of 8‰ of the dissolution solution is added to the dissolution solution with a pipette, and stirred.

[0039] 4) Use the solid-liquid separation method of vacuum filtration separation for solid-liquid separation and washing to obtain stable sodium aluminate solution and red mud. The stable sodium aluminate solution has a molecular ratio of 1.4 and is placed at room temperature for 3 hours without hydrolysis. sodium solution.

Embodiment 3

[0041] 1) Configure the sodium aluminate solution hydrolysis inhibitor, the ratio of absolute ethanol, EDTA, mannitol, sodium tartrate and water is 5:5:5:10:75.

[0042] 2) Bauxite Alkali solution is used to dissolve alumina in bauxite, and hydrothermal reaction kettle is used to dissolve alumina. The temperature of bauxite dissolution is 180° C.; bauxite is gibbsite type bauxite.

[0043] 3) After the dissolution, the temperature was lowered to 88° C., the hydrothermal reaction kettle was opened, and a hydrolysis inhibitor of 1% of the total volume of the dissolution solution was added to the dissolution solution with an electronic pipette, and stirred.

[0044] 4) Use a solid-liquid separation method in centrifugal separation, vacuum filtration separation or pressure filtration separation to perform solid-liquid separation and washing to obtain stable sodium aluminate solution and red mud. The stable sodium aluminate solution has a molecular ratio of 1.7, Place the sodium al...

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Abstract

The invention relates to a method for preventing hydrolysis in a separation process of a bauxite dissolution experiment. The method comprises the following steps: (1) preparing a sodium aluminate solution hydrolysis inhibitor, wherein a ratio of anhydrous ethanol to EDTA to mannitol to sodium tartrate to water is (1-10): (1-10): (1-10): (1-20): (50-80); 2) dissolving out aluminum oxide from bauxite by adopting a hydrothermal reaction kettle or a dissolution steel bomb; 3) reducing a temperature to 100 DEG C or below after dissolution, opening the hydrothermal reaction kettle or the dissolutionsteel bomb, adding a hydrolysis inhibitor accounting for 0.1%-2% of the total volume of a dissolved solution into the dissolved solution, and carrying out stirring; and 4) carrying out solid-liquid separation and washing to obtain a stable sodium aluminate solution and red mud. According to the invention, the hydrolysis inhibitor is synthesized, so the low-molecular-ratio sodium aluminate solution can be stabilized for 2 hours or more, and the accuracy of the bauxite dissolution experiment is ensured.

Description

technical field [0001] The invention belongs to the method field of bauxite processing experiments, in particular to a method for preventing hydrolysis during the separation process of bauxite dissolution experiments. Background technique [0002] Aluminum is the second largest metal material after steel in the world, and is widely used in many industries of the national economy such as construction, transportation, mechanical equipment, and electrical appliances. The rapid development of the aluminum industry has driven the development of the aluminum oxide industry, the raw material for electrolytic aluminum. According to the statistics of the Ministry of Industry and Information Technology, my country's alumina output in 2019 was 72.474 million tons, accounting for 62% of the global alumina output, and it is the world's largest producer of alumina. However, the relative shortage of bauxite resources has led to the frequent replacement of bauxite in my country's alumina pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
CPCC01F7/0666C01F7/06
Inventor 李来时吴玉胜
Owner SHENYANG POLYTECHNIC UNIV