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Method for preparing polyaluminium ferric chloride flocculating agent by pickling waste liquid and waste aluminium material

A technology of polyaluminum chloride and pickling waste liquid, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of pickling waste liquid pollution, etc., and achieve the effects of reducing pollution, fast oxidation speed, and simple process operation

Active Publication Date: 2014-04-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing polyaluminum ferric chloride flocculant by using pickling waste liquid and waste aluminum material and its application, so as to solve the pollution problem of pickling waste liquid and make full use of waste at the same time, turning waste into treasure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 50g of waste aluminum with an aluminum content of 70%, and 740g of industrial hydrochloric acid (HCl is 23%), and put them into an acid-resistant reaction vessel. When the solution pH=1.0, filter, and the filtrate is the aluminum-containing solution;

[0026] (2) Take 55g of iron and steel pickling waste liquid and 0.22g of waste aluminum material, put them into the acid-resistant reaction container, and wait for complete dissolution, the solution is an iron-containing solution with pH=1.8;

[0027] (3) Put the aluminum-containing solution in step (1) and the iron-containing solution in step (2) into the anti-corrosion reaction container, and add 2mol / L sodium hydroxide solution dropwise while stirring. When the pH=1.91, Heat, control the temperature at 75°C, stir slowly, add 2.4g of sodium chlorate, react for 40 minutes, stop heating, and age for 3 hours to obtain Al 2 o 3 Content 10.2%, Fe 2 o 3 The finished product of polyaluminum ferric chloride with a ...

Embodiment 2

[0029] (1) Take 43g of scrap aluminum with an aluminum content of 75%, and 620g of industrial hydrochloric acid (HCl is 25%), and put them into an acid-resistant reaction vessel. When the solution pH=1.1, filter, and the filtrate is the aluminum-containing solution;

[0030] (2) Take 105g of iron and steel pickling waste liquid and 0.45g of waste aluminum material, put them into an acid-resistant reaction container, and wait until completely dissolved, the solution is an iron-containing solution with pH=1.9;

[0031] (3) Put the aluminum-containing solution in step (1) and the iron-containing solution in step (2) into the anti-corrosion reaction container, and add 2mol / L sodium hydroxide solution dropwise while stirring. When the pH=1.98, Heat, control the temperature at 70°C, stir slowly, add 4.5g of sodium chlorate, react for 50 minutes, stop heating, and age for 2 hours to obtain Al 2 o 3 Content 8.6%, Fe 2 o 3 The finished product of polyaluminum ferric chloride with a...

Embodiment 3

[0033] (1) Take 35g of scrap aluminum with an aluminum content of 80%, and 520g of industrial hydrochloric acid (HCl is 26%), and put them into an acid-resistant reaction vessel. When the solution pH=0.9, filter, and the filtrate is the aluminum-containing solution;

[0034] (2) Take 150g of iron and steel pickling waste liquid and 0.6g of waste aluminum material, put them into the acid-resistant reaction container, and wait for complete dissolution, the solution is an iron-containing solution with pH=1.7;

[0035] (3) Put the aluminum-containing solution in step (1) and the iron-containing solution in step (2) into the anti-corrosion reaction container, and add 2mol / L sodium hydroxide solution dropwise while stirring. When the pH=2.35, Heat, control the temperature at 75°C, stir slowly, add 6.5g of sodium chlorate, react for 40 minutes, stop heating, and age for 3 hours to obtain Al 2 o 3 Content 7.1%, Fe 2 o 3 The finished product of polyaluminum ferric chloride with a c...

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Abstract

The invention discloses a method for preparing a polyaluminium ferric chloride flocculating agent by pickling waste liquids and waste aluminium materials. The method for preparing a polyaluminium ferric chloride flocculating agent, comprises: mixing waste aluminium materials after acid dissolution and pickling waste liquids, regulating a pH value by sodium hydroxide, and oxidizing and polymerizing the mixture by a strong oxide to obtain the polyaluminium ferric chloride flocculating agent. Compared with the prior art, the method uses the raw materials which are cheap and wide in source, and has advantages of simple process and easy operation. The addition of waste aluminium materials is controlled to regulate the pH valve, thereby effectively reducing the cost. The proportion of aluminium to iron in the raw materials is flexibly controlled, and the application range is winder.

Description

technical field [0001] The invention relates to a method for preparing a polyaluminum chloride ferric flocculant by using pickling waste liquid and waste aluminum material and its application, which belongs to the technical fields of environmental chemical industry, waste water treatment and the like. Background technique [0002] In order to improve the surface structure of steel or process the surface, the corrosion of strong acid is often used to clean the steel surface. When the cleaning is carried out to a certain extent, the acid concentration in the washing solution decreases, and new acid needs to be replaced to maintain proper pickling. Speed, the residual liquid is discharged to form a waste liquid with high concentration of metal ions and residual acid, and its main component is ferrous chloride solution. According to incomplete statistics, the pickling waste discharged nationwide is greater than 1×10 6 m 3 / a. Pickling waste liquid has strong acidity, high con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 汤兵卢志刚
Owner GUANGDONG UNIV OF TECH