Method for producing ferro-aluminium composite water purifying agent using aluminium hydroxide mud

A technology of aluminum hydroxide and water purifying agent, which is applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of waste of land resources, secondary pollution, etc., and achieve simple manufacturing process, No secondary pollution, no waste of land resources

Inactive Publication Date: 2007-11-14
童益
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AI Technical Summary

Problems solved by technology

[0002] In the production process of aluminum materials, pickling wastewater and alkali washing wastewater are generally produced, which are rich in free aluminum ions, and aluminum hydroxide sludge (hereinafter referred to as aluminum-containing sludge) is generated through sewage treatment. This aluminum hydroxide sludge is currently It has not been reused, and it is usually used for landfill treatment, which is easy to form secondary pollution and waste land resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The present invention uses the aluminum hydroxide sludge produced in the production of aluminum materials to produce a liquid composite aluminum-iron water purifier using the following process steps:

[0015] In the present invention, 70% by weight of iron-containing waste acid solution (waste iron-containing hydrochloric acid, acid content> 8%) is added to the reaction tank, and 30% by weight of aluminum hydroxide sludge is gradually added, and the reaction is stirred at normal temperature to make the aluminum hydroxide pollute. The sludge is completely reacted and dissolved, and a liquid composite aluminum-iron water purifier is gradually formed. Use a precision pH test paper of 0 to 5 to detect the pH value to control the pH value at 3.0. If the pH value is less than 3.0, continue to add aluminum hydroxide sludge , If it is higher than 3.0, iron-containing waste acid can be added. After reaching the PH value of 3.0, the material is discharged. The supernatant of the liqu...

Embodiment 2

[0017] The present invention uses the aluminum hydroxide sludge produced in the production of aluminum materials to produce a liquid composite aluminum-iron water purifier using the following process steps:

[0018] In the present invention, 35% by weight of iron-containing waste acid solution (waste iron-containing sulfuric acid, acid content> 8%) is added to the reaction tank, and 65% by weight of aluminum hydroxide sludge is gradually added. The sludge completely reacts and dissolves to gradually generate a liquid composite aluminum-iron water purifier. Use a precision pH test paper of 0 to 5 to detect the pH value to control the pH value at 2.5. If the pH value is less than 2.5, continue to add aluminum hydroxide sludge , If it is higher than 2.5, you can add iron-containing waste acid. Discharge after reaching the PH value of 2.5. After the liquid composite aluminum-iron water purifier is naturally precipitated, the supernatant is the finished product of the liquid composite ...

Embodiment 3

[0020] The present invention uses the aluminum hydroxide sludge produced in the production of aluminum materials to produce a liquid composite aluminum-iron water purifier using the following process steps:

[0021] In the present invention, 15% by weight of iron-containing waste acid (waste iron-containing hydrochloric acid, acid content> 8%) is added to the reaction tank, and 84% by weight of aluminum hydroxide sludge is gradually added, and the reaction is stirred at room temperature to make the aluminum hydroxide sludge Completely react and dissolve, and gradually generate a liquid composite aluminum-iron water purifier. Adding a small amount of additives is 0.1% by weight of defoamer, and the amount depends on the degree of foaming during the reaction. Use a precision pH test paper of 0 to 5 to detect the pH value and control the pH value at 2.8. If the pH value is less than 2.8, you can continue to add aluminum hydroxide sludge. If it is higher than 2.8, you can add iron-con...

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Abstract

This invention relates to a method of using aluminium hydroxide sludge to produce aluminum-iron compound purifying agent, belongs to sewage disposal technosphere. This method mostly add waste pickle liquid containing iron to reaction tank, gradually add aluminium hydroxide sludge, at ordinary temperature whip for reaction, make aluminium hydroxide sludge by step dissolve and generate liquid compound aluminum iron purifying agent; after precipitation, supernatant liquid is finished product of liquid compound aluminum-iron purifying agent. This invention recycles waste vitriol or hydrochloric acid containing iron, in favor of environmental health.

Description

Technical field [0001] The invention relates to a method for producing aluminum-iron composite water purifying agent using aluminum hydroxide sludge, and is specifically used for wastewater treatment to achieve the purpose of comprehensive utilization of waste, and belongs to the technical field of sewage treatment. Background technique [0002] In the aluminum production process, acid washing wastewater and alkaline washing wastewater are generally produced, which are rich in free aluminum ions, and are produced through sewage treatment to produce aluminum hydroxide sludge (hereinafter referred to as aluminum-containing sludge). This aluminum hydroxide sludge is currently It has not been reused, and is usually used for landfill disposal, which is likely to cause secondary pollution and waste land resources. [0003] The waste iron-containing hydrochloric acid or waste iron-containing sulfuric acid generated after derusting with hydrochloric acid or sulfuric acid in the steel pip...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F11/00C02F1/66
Inventor 童益
Owner 童益
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