Efficient aluminum removing agent for alkali recovery and using method thereof

A kind of aluminum remover, high-efficiency technology, applied in chemical instruments and methods, metallurgical wastewater treatment, special compound water treatment, etc. The effect of reaction rate

Inactive Publication Date: 2021-02-26
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, in order to solve the problem of low aluminum removal efficiency of the existing aluminum removal agent, the present invention provides an aluminum removal agent for high-efficiency alkali recovery and its use method. The aluminum removal agent can increase the aluminum removal rate, reduce the reaction time, and improve Recovery and treatment efficiency of waste lye

Method used

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  • Efficient aluminum removing agent for alkali recovery and using method thereof

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Effect test

Embodiment 1

[0029] Measure the demoulding waste caustic lye of a certain mold repairing factory of 1L, after detecting aluminum ion content is 135g / L, and alkalinity is 137g / L, handles this waste caustic according to process of the present invention, and process is as follows:

[0030] Add 472.5g of aluminum removal agent and 1L of water, stir well, monitor the temperature, the temperature begins to drop after 52 minutes of reaction, and the reaction is completed. The lye was separated from the calcium aluminate by pressure filtration, and the filter residue was washed with 250 ml of water. After testing, the volume of lye after treatment is 1.2L, the concentration of aluminum ions is 9.4g / L, the removal rate of aluminum ions is 93%, and the alkalinity is 121g / L, which can meet the demoulding conditions without adding sodium hydroxide.

Embodiment 2

[0032] Measure the demoulding waste lye of 1L certain aluminum profile factory, after testing aluminum ion content is 104g / L, and alkalinity is 122g / L, handles this waste lye according to process of the present invention, and process is as follows:

[0033] Add 312g of aluminum removal agent and 1L of water, stir well, monitor the temperature, the temperature begins to drop after 40 minutes of reaction, and the reaction is completed, separate the lye from the calcium aluminate by pressure filtration, and wash the filter residue with 250ml of water. After testing, the volume of lye after treatment is 1.4L, the concentration of aluminum ions is 6.1g / L, the removal rate of aluminum ions is 94%, and the alkalinity is 89g / L. Sodium hydroxide can be added appropriately to meet the concentration required for production.

Embodiment 3

[0035] Measure the alkaline etching solution of a certain aluminum alloy surface treatment plant in 1L, after testing, the aluminum ion content is 32g / L, and the alkalinity is 64g / L. According to the process of the present invention, the spent alkaline solution is processed, and the process is as follows:

[0036] Add 128g of aluminum removal agent and 1L of water, stir well, monitor the temperature, the temperature begins to drop after 36 minutes of reaction, and the reaction is completed, separate the lye from the calcium aluminate by pressure filtration, and wash the filter residue with 250ml of water. After testing, the volume of lye after treatment is 1.5L, the concentration of aluminum ions is 2.9g / L, the removal rate of aluminum ions is 91%, and the alkalinity is 59g / L. The surface treatment of aluminum profiles can be carried out without adding sodium hydroxide.

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Abstract

The invention belongs to the field of environmental protection, and relates to an efficient aluminum removing agent for alkali recovery and a using method thereof. The aluminum removing agent comprises calcium oxide, calcium hydroxide, calcium peroxide, sodium peroxide, hydrogen peroxide and sodium percarbonate, and specifically comprises, by mass, 20-40% of calcium oxide; 10-30% of calcium hydroxide; 10-20% of calcium peroxide; 5-10% of sodium peroxide; 2-8% of hydrogen peroxide; and 1-5% of sodium percarbonate, totaling 100%. The aluminum removing agent can increase the aluminum removing rate, shorten the reaction time and improve the recovery treatment efficiency of waste alkali liquor.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a high-efficiency alkali recovery aluminum remover and a use method thereof, which are used for removing aluminum ions in waste lye produced in the aluminum alloy industry, so as to achieve the purpose of recycling the waste lye. Background technique [0002] In the field of aluminum alloys, sodium hydroxide lye is often used as a solution for dissolving aluminum, such as extrusion die repair and surface treatment of aluminum profiles. Aluminum profile processing generally adopts die extrusion. Aluminum remains on the die during the extrusion process, so it needs to be removed before the die is repaired. At present, the commonly used method is to use sodium hydroxide lye heating and soaking method to remove the residual aluminum on the mold. At high temperature, sodium hydroxide reacts with aluminum to dissolve the aluminum on the mold, and clean the mold for subsequent mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F103/16
CPCC02F1/58C02F2103/16C02F2305/02
Inventor 张弟刘昌明王帅刘志伟冯静阳王成滨任玉宝
Owner CHINA ZHONGWANG
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