Method for producing aluminium sulfate using aluminium hydroxide mud

A technology of aluminum hydroxide and aluminum sulfate, applied in the direction of aluminum sulfate, chemical instruments and methods, sludge treatment, etc., can solve the problems of secondary pollution, waste of land resources, etc., achieve simple manufacturing process, no waste of land resources, and reduce cost effect

Inactive Publication Date: 2007-11-14
童益
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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-co

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The present invention utilizes the aluminum hydroxide sludge that aluminum material production produces to produce aluminum sulfate and adopts the following process steps:

[0016] The present invention takes 45% by weight of dilute sulfuric acid solution (acid content 20%) and puts it into the reaction tank, gradually adds 55% by weight of aluminum hydroxide sludge, stirs and reacts at normal temperature, makes the aluminum hydroxide sludge completely react and dissolve, and gradually generates liquid For aluminum sulfate, use 0-5 precision pH test paper to check the pH value, so that the pH value is controlled at 3.0. If the pH value is less than 3.0, you can continue to add aluminum hydroxide sludge. If it is higher than 3.0, you can add dilute sulfuric acid. After reaching the pH value of 3.0, the material is discharged. The supernatant after natural precipitation of liquid aluminum sulfate is liquid aluminum sulfate. Monitor the aluminum content of liquid aluminum...

Embodiment 2

[0019] The present invention utilizes the aluminum hydroxide sludge that aluminum material production produces to produce aluminum sulfate and adopts the following process steps:

[0020] The present invention takes 30% by weight of waste sulfuric acid solution (acid content 50%) and puts it into the reaction tank, gradually adds 70% by weight of aluminum hydroxide sludge, and stirs and reacts at normal temperature, so that the aluminum hydroxide sludge is completely reacted and dissolved, and gradually generates liquid For aluminum sulfate, use 0-5 precision pH test paper to check the pH value, so that the pH value is controlled at 2.5. If the pH value is less than 2.5, you can continue to add aluminum hydroxide sludge. If it is higher than 2.5, you can add dilute sulfuric acid. After reaching the pH value of 2.5, the material is discharged. The supernatant after natural precipitation of liquid aluminum sulfate is liquid aluminum sulfate. Monitor the aluminum content of liqu...

Embodiment 3

[0023] The present invention utilizes the aluminum hydroxide sludge that aluminum material production produces to produce aluminum sulfate and adopts the following process steps:

[0024] In the present invention, 20% by weight of concentrated sulfuric acid solution (96% acid content) is added to the reaction tank, 79.9% by weight of aluminum hydroxide sludge is gradually added, and the reaction is stirred at normal temperature to completely react and dissolve the aluminum hydroxide sludge, and gradually generate liquid Aluminum sulfate, add additive defoamer to be 0.1% by weight, detect pH value with 0~5 precision pH test paper, make pH value be controlled at 2.8, if pH value is less than 2.8, then can continue to add aluminum hydroxide sludge, if If it is higher than 2.8, dilute sulfuric acid can be added. After reaching the pH value of 2.8, the material is discharged. The supernatant after natural precipitation of liquid aluminum sulfate is liquid aluminum sulfate. Monito...

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Abstract

The invention relates to a kind of method producing aluminum sulfate using Riopone, which belongs to technique field of sewage disposal. Put solution dilute sulfuric acid or abandoned sulfuric acid or oil of vitriol into reaction tank, add Riopone mud gradually, mix them make them activate at room temperature, make Riopone mud activate to dissolve gradually and form liquid aluminum sulfate; heat them in the autoclave, heat and vacuumize liquid aluminum sulfate to concentrate it; cool liquid aluminum sulfate to form massive aluminum sulfate at room temperature which is crushed to form solid aluminum sulfate. It can reclaim and reuse Riopone mud in this invention, which regards recrement as treasure, not easy to form the secondary pollution, propitious to environmental sanitation, not waste recourses of land; it can debase the production coat and need not increase production equipment, the fabricate craft is simple, liquid aluminum sulfate or solid aluminum sulfate which is used by many sewage treatment plants can totally reach the disposing request.

Description

technical field [0001] The invention relates to a method for producing aluminum sulfate by utilizing aluminum hydroxide sludge, specifically for waste water treatment to achieve the purpose of comprehensive utilization of waste, and belongs to the technical field of sewage treatment. Background technique [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 is usually used for landfill treatment, which is easy to cause secondary pollution and waste land resources. [0003] In the prior art, the aluminum sulfate mainly adopts dilute sulfuric acid to react with bauxite, then separates by precipitation, and takes the supernatant to obtain the liquid aluminum sulfate produ...

Claims

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Application Information

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IPC IPC(8): C01F7/74C02F11/00
Inventor 童益
Owner 童益
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