Method for recovering alumina

A recovery method and technology of alumina, applied in the direction of alumina/aluminum hydroxide, solid waste removal, etc., can solve the problems of large loss of acid and alkali, high material requirements, corrosion of roasters and wiring pipes, etc. , to achieve the effect of improving recovery rate, high aluminum-silicon separation efficiency, and reducing evaporation energy consumption

Active Publication Date: 2016-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0014] This method involves acid and alkali at the same time, and the unavoidable neutralization of acid and alkali in the process leads to a large loss of acid and alkali; in addition, AlCl 3 During the process of roasting and recovering hydrochloric acid, it will cause serious corrosion to the roasting furnace and wiring pipes, and the requirements for materials are very high

Method used

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  • Method for recovering alumina
  • Method for recovering alumina
  • Method for recovering alumina

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Use ethanol, potassium hydroxide and water to prepare a solution containing alcohol and alkali in a certain proportion, wherein, ethanol and water are configured in a ratio of 9:1 by volume, and potassium hydroxide is used to make the concentration of potassium in the solution containing alcohol and alkali reach 6mol / The amount of L was added.

[0058] Add the fly ash that is crushed and ground to below 80 μm into the prepared alcohol-alkali-containing solution, so that the volume ratio of the alcohol-alkali-containing solution to the mass ratio of the fly ash is 5 liters / kg (liquid-solid ratio). Then the dissolution treatment was carried out at 210° C. for 150 minutes. Filtrate after the dissolution treatment to obtain filtrate and filter residue.

[0059] After the filtrate is added with appropriate amount of potassium hydroxide, ethanol and water to make each parameter consistent with the solution containing alcohol and alkali, it returns to the fly ash dissolution...

Embodiment 2

[0063] Use sodium methoxide and methanol to prepare a solution containing alcohol and alkali, and add sodium methoxide in such an amount that the concentration of sodium in the solution containing alcohol and alkali reaches 2 mol / L.

[0064] Add the fly ash that is crushed and ground to below 80 μm into the prepared alcohol-alkali-containing solution, so that the volume ratio of the alcohol-alkali-containing solution to the mass ratio of the fly ash is 8 liters / kg (liquid-solid ratio). Then, the dissolution treatment was carried out at 260° C. for 90 minutes. Filtrate after the dissolution treatment to obtain filtrate and filter residue.

[0065] The filtrate is added with an appropriate amount of sodium methoxide and methanol to make each parameter consistent with the solution containing alcohol and alkali, and then returns to the fly ash dissolution treatment. The filter residue is washed with an aqueous alkali solution, which is an aqueous sodium hydroxide solution with a ...

Embodiment 3

[0069] Prepare an alcohol-alkali-containing solution with methanol, sodium hydroxide and water, wherein methanol and water are configured in a ratio of 7:3 by volume, and sodium hydroxide is used to make the concentration of sodium in the alcohol-alkali-containing solution reach 12mol / L adding; and adding a silicon-fixing agent, calcium oxide, into the alcohol-alkali-containing solution, and the amount of the silicon-fixing agent added is 1% by mass of the amount of subsequent red mud added.

[0070] Add the red mud that is crushed and ground to less than 80 μm into the prepared alcohol-alkali-containing solution, so that the volume ratio of the alcohol-alkali-containing solution to the mass ratio of red mud is 7 liters / kg (liquid-solid ratio). Dissolution treatment was then carried out at 240° C. for 15 minutes. Filtrate after the dissolution treatment to obtain filtrate and filter residue. Filter residue XRD pattern image 3 shown.

[0071] The filtrate is added with appr...

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Abstract

The invention discloses a method for recovering alumina. The method comprises: dissolving out industrial waste containing aluminum and / or associated ore containing aluminum in a solution containing alcohol-alkali; and conducting washing, silicon impurity removal, crystallization treatment and roasting treatment to obtain alumina. Compared with the existing alumina recovery method, the alumina recovery method of the present invention has higher recovery rate and lower energy consumption.

Description

technical field [0001] The invention relates to a recovery method of alumina. Background technique [0002] China's bauxite resources are very short. my country maintains about 30% of the world's alumina production with 3% of the world's resource reserves. The resource consumption is very serious, and the guarantee period is less than 10 years. In addition, high-quality bauxite resources are also extremely Shortage, medium and low-grade ores with alumina / silica mass ratio (A / S) of 4-6 account for 60% of the total reserves. Therefore, our country pays special attention to the technical research of recovering alumina from aluminum-containing industrial waste slag and aluminum-containing associated ore. [0003] At present, the methods of recovering alumina from aluminum-containing industrial waste slag or aluminum-containing semi-raw ore in my country are mainly divided into alkali method and acid method, among which alkali method includes fire method and wet method, and acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00
Inventor 张然崔龙鹏
Owner CHINA PETROLEUM & CHEM CORP
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