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A zero-discharge treatment method for steel pickling wastewater

A technology for pickling wastewater and a treatment method, applied in the field of industrial wastewater treatment, can solve the problems of complex input equipment, unsuitable, high operating costs, and achieve the effects of reducing the amount of sulfuric acid used, avoiding waste, and achieving zero discharge

Active Publication Date: 2019-01-01
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is complex and requires high equipment and operating costs, which is not suitable for steel companies with thin profits

Method used

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  • A zero-discharge treatment method for steel pickling wastewater

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Embodiment Construction

[0027] The present invention will be described in further detail with reference to specific examples.

[0028] 250mL of invalid iron and steel pickling water was used to carry out experimental demonstration through the above process scheme. The invalid iron and steel pickling water contained 280g / L of ferrous sulfate and 70g / L of sulfuric acid.

[0029] Put the steel pickling water in a large beaker through 3g / h of ozone, fully aerate for 1 hour, and stop the aeration and oxidation. At this time, the pickling water solution turns from green to brown; heat the pickling water to 40°C, The rust-containing iron block is pickled continuously until the pickling water fails, at this time, the solution turns from the original brownish yellow color to dark green; filter the solution through filter paper, cool to room temperature, and wait until the next day to obtain 10.6g of clean heptahydrate Ferrous sulfate crystals;

[0030] Add 0.15 mol of acid to the mother liquor after crystall...

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Abstract

The invention discloses a zero discharge treatment method for steel pickling waste water. The zero discharge treatment method for the steel pickling waste water comprises the following steps: carrying out filtration treatment on the steel pickling waste water by virtue of a grille; introducing the steel pickling waste water subjected to the filtration treatment into a high-efficiency oxidation pond; recycling the steel pickling waste water subjected to high-efficiency oxidation into a pickling tank in a steel pickling process, and heating the steel pickling waste water in the pickling tank; adding acid into the heated pickling tank, and then carrying out pickling treatment on steel; carrying out filtration treatment on waste water at the outlet of the pickling tank by virtue of a grille; introducing the steel pickling waste water subjected to filtration treatment by virtue of the grille into a crystallizing pond, and carrying out crystallization at normal temperature; and carrying out the steps on mother liquor of the crystallizing pond. The zero discharge treatment method for the steel pickling waste water has the advantages that investment for process equipment cost and operating cost is greatly reduced, medicaments such as calcium hydroxide are not adopted, even more important, usage amount of sulphuric acid is reduced, waste water discharge problem is not produced, and the crystallization carried out at normal temperature is adopted for obtaining ferrous sulphate heptahydrate crystal byproduct.

Description

technical field [0001] The invention belongs to the field of industrial sewage treatment, and in particular relates to a zero-discharge treatment method for steel pickling wastewater. Background technique [0002] my country's steel output has exceeded 100 million tons. During the production process, it must undergo pickling treatment before leaving the factory. After passing through the market to various processing plants, it must undergo another pickling surface treatment before it can be processed into end products. For every 10,000 tons of steel pickling treatment, an average of 20,000 tons of pickling wastewater and 600 tons of waste acid are generated. The iron and steel pickling water in the iron and steel plant begins to fail when the concentration of ferrous sulfate reaches about 200g / L and the concentration of sulfuric acid is about 70g / L. At present, this pickling wastewater is mainly passed through the neutralization precipitation method, and then discharged up t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCC02F1/72C02F9/00C02F2301/08
Inventor 丁武龙吴雅琴张高旗朱圆圆杨波
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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