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Environment friendly processing method of waste acid containing ferrous sulphate

A ferrous sulfate and environmental protection treatment technology, applied in the direction of ferric sulfate, magnesium sulfate, iron oxide, etc., can solve the problems of secondary pollution, achieve high comprehensive benefits, save waste acid treatment costs, and solve the effects of pollution-free treatment.

Inactive Publication Date: 2009-08-26
SHANDONG JUNHUI CONSTR & INSTALLATION ENG
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide an environmentally friendly treatment method for waste acid containing ferrous sulfate. This treatment method not only solves the problem that the existing treatment method easily causes secondary pollution, but also the chemical substances obtained after treatment can be recycled.

Method used

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  • Environment friendly processing method of waste acid containing ferrous sulphate

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Embodiment Construction

[0017] from figure 1 As can be seen from the block diagram of the technological process, the technological process of the present invention is as follows:

[0018] The chemical waste sulfuric acid discharged from the production process of special steel and titanium dioxide is sent to the oxidation tank, and at the same time, hydrogen peroxide oxidant is added to continuously stir for oxidation reaction. The ferrous sulfate in the waste sulfuric acid is completely reacted under the action of the hydrogen peroxide oxidant to form ferric sulfate; Send the completely oxidized waste acid into the neutralization tank, and add magnesium oxide to neutralize the waste sulfuric acid. During the reaction, the magnesium oxide first reacts with the sulfuric acid, and then reacts with the iron sulfate in the waste acid. The reaction produces reddish-brown ferric hydroxide precipitate and magnesium sulfate. When the reaction reaches PH=4-5, stop adding magnesium oxide, and the neutralization...

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Abstract

The invention discloses an environment friendly processing method of waste acid containing ferrous sulphate, mainly comprising the following steps: the waste acid containing ferrous sulphate is oxidized by hydrogen peroxide and neutralized and displaced by magnesium oxide to generate ferric hydroxide deposit and magnesium sulphate by reaction, and fine powder of ferric oxide is obtained after the generated ferric hydroxide deposit is filtered, washed by water and dried while hot. In the whole processing course, no three wastes are discharged; the fine powder products of ferric oxide and magnesium sulphate products obtained through processing can be sold and the obtained magnesium sulphate products can also be reused; the treated water discharged during production can be recycled as primary water, thus radically solving nuisanceless disposal of the waste acid containing ferrous sulphate, greatly saving the processing cost of waste acid and obtaining by-products to be sold, therefore, the comprehensive benefits are high.

Description

technical field [0001] The invention relates to a waste acid treatment method. Background technique [0002] At present, a large amount of sulfuric acid is consumed in the production process of special steel and titanium dioxide, and about 8 tons of H 2 SO 4 20% dilute sulfuric acid, the acid contains a large amount of ferrous sulfate. At present, the treatment method of this waste sulfuric acid is: use quicklime to neutralize, and after neutralization, a large amount of Fe will be produced 2 o 3 of gypsum, due to the content of Fe 2 o 3 The usability of the discharged gypsum is limited, and it is generally stored as industrial waste residue, which fundamentally does not solve the problem of environmental pollution, but is just exchanged for another pollution method. Therefore, inventing an environmentally friendly treatment method for waste acid has become an urgent problem to be solved in the special steel and titanium dioxide industries. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C01G49/06C01F5/40C01G49/14
Inventor 庞仁杰李军英寇洪庆
Owner SHANDONG JUNHUI CONSTR & INSTALLATION ENG