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A method for removing and recovering water-soluble salt in secondary aluminum ash

A technology of water-soluble salt and secondary aluminum, applied in separation methods, general water supply saving, chemical instruments and methods, etc., can solve the problems of poor comprehensiveness of desalination

Active Publication Date: 2020-10-30
湖北新金洋资源股份公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for removing and recovering water-soluble salt in secondary aluminum ash, aiming at solving the problem of poor comprehensiveness of desalting

Method used

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  • A method for removing and recovering water-soluble salt in secondary aluminum ash

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Experimental program
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Effect test

Embodiment 1

[0028] A method for removing and recovering water-soluble salts in secondary aluminum ash includes the following steps:

[0029] S1. Put the secondary aluminum ash into a ball mill for fine grinding, and after passing through a 60-mesh sieve, return the large particles of aluminum that cannot be ground back to the primary aluminum ash smelting furnace to recover aluminum, and collect the fine ash under the sieve for use;

[0030] S2. Put the fine ash in S1 into a first-stage reaction tank at a liquid-to-solid mass ratio of 7:1 and mix with water, stir thoroughly at a rate of 250r / min, control the temperature in the reaction tank to be constant at 60°C, and reduce the gas generated in the reaction tank Into the ammonia absorption tower, after leaching for 120 minutes, the reaction liquid in the reaction tank is filtered and separated, the filtrate is sent to the collecting tank, and the filter residue is sent to the secondary reaction tank;

[0031] The filter residue in S3 and S2 is ...

Embodiment 2

[0039] S1. Put the secondary aluminum ash into a ball mill for fine grinding, and after passing through a 60-mesh sieve, return the large particles of aluminum that cannot be ground back to the primary aluminum ash smelting furnace to recover aluminum, and collect the fine ash under the sieve for use;

[0040] S2. Put the fine ash in S1 into the first-stage reaction tank at a liquid-solid mass ratio of 14:1 and mix with water, stir fully at a rate of 300r / min, control the temperature in the reaction tank to be constant at 90°C, and reduce the gas generated in the reaction tank Into the ammonia absorption tower, after 240 minutes of leaching, the reaction liquid in the reaction tank is filtered and separated, the filtrate is sent to the collecting tank, and the filter residue is sent to the secondary reaction tank;

[0041] The filter residue in S3 and S2 is mixed with water in the secondary reaction tank at a liquid-to-solid mass ratio of 8:1, fully stirred at a rate of 300r / min, an...

Embodiment 3

[0049] S1. Put the secondary aluminum ash into a ball mill for fine grinding, and after passing through a 60-mesh sieve, return the large particles of aluminum that cannot be ground back to the primary aluminum ash smelting furnace to recover aluminum, and collect the fine ash under the sieve for use;

[0050] S2. Put the fine ash in S1 into a first-stage reaction tank at a liquid-solid mass ratio of 10:1, mix with water, stir fully at a rate of 280r / min, control the temperature in the reaction tank to be constant at 75°C, and reduce the gas generated in the reaction tank Introduce into the ammonia absorption tower, after leaching for 180 minutes, the reaction liquid in the reaction tank is filtered and separated, the filtrate is sent to the collecting tank, and the filter residue is sent to the secondary reaction tank;

[0051] The filter residue in S3 and S2 is mixed with water in the secondary reaction tank at a liquid-to-solid mass ratio of 5:1, fully stirred at a rate of 270r / m...

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Abstract

The invention relates to the technical field of secondary aluminum ash treatment and discloses a method for removing and recycling water-soluble salts in secondary aluminum ash. The method comprises the following steps: S1, grinding and screening secondary aluminum ash; S2, putting fine ash into a primary reaction tank, performing mixing and stirring, and feeding filtrate into a liquid collectiontank; S3, mixing and stirring filter residues of the step S2 with water in a secondary reaction tank, filtering and separating a reaction liquid in the secondary reaction tank, and feeding filtrate into the liquid collection tank; S4, heating the liquid in the liquid collection tank, performing evaporation concentration, and performing standing and cooling; S5, feeding a clear liquid after concentration in the liquid collection tank into an electrodialysis device desalting chamber, introducing a saturated NaCl solution into a concentration chamber, introducing an electrode lotion into an electrode chamber, discharging air in a circulation manner, connecting a constant-current power supply, and adjusting the pressure difference of the desalting chamber and the concentration chamber, whereina material liquid in circulation is constantly fed into the concentration chamber, and a next batch of the material liquid is replaced every other 4-5 hours in the desalting chamber; and S6, crystallizing a concentrated backflow liquid, and performing separation and drying, so as to obtain a mixed salt. By adopting the method, the comprehensive desalting effect can be improved.

Description

Technical field [0001] The invention relates to the technical field of secondary aluminum ash treatment, in particular to a method for removing and recovering water-soluble salts in secondary aluminum ash. Background technique [0002] Aluminum ash is a by-product produced due to defects in the operation, equipment, and processing methods in the production process of the primary aluminum industry and the secondary aluminum industry. This by-product contains high metal aluminum and its oxides, salts, etc. Valuable components, often used to recover metallic aluminum, alumina or special alumina, can also be used to produce flocculants, refractory materials, roadbed materials, biological materials, etc., and these recycling processes often ignore the salt in aluminum ash At the same time, the process of desalination is accompanied by a large amount of waste water and waste gas. Most of the waste gas is treated by ammonia absorption tower to produce ammonium salt products. Waste water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C22B7/00C22B21/00C02F103/34
CPCC02F1/4604C02F1/4693C02F2103/34C22B7/00C22B21/00Y02P10/20Y02A20/124
Inventor 李登奇秦庆伟陈精智周毅黄亮马靓龙在华
Owner 湖北新金洋资源股份公司
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