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A kind of treatment method of pickling wastewater in iron and steel industry

A technology for pickling wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problems of waste of metal resources, difficulty in recycling, and non-recyclability. , to achieve the effect of reducing investment and operating costs, high metal particle separation efficiency, saving space and operation

Active Publication Date: 2016-03-30
JIANGSU BESITE WATER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The amount of sludge produced is large, the composition of sludge is complex, it is difficult to recycle, it cannot be reused, and it is very harmful. The sludge is mainly composed of hydroxide precipitation, excess lime, calcium fluoride, lime powder impurities, and PAC / PAM agents , water (accounting for about 50%∽65%), etc., the content of valuable metal salts is very low, there is basically no value for re-smelting and recycling, and more impurities and water make the amount of sludge generated very large, and due to heavy metals presence (e.g. chromium compounds), such sludge has been included in the list of hazardous solid waste;
[0006] (2) Landfill disposal of sludge causes waste of metal resources and damage to the environment. Sludge produced by wastewater containing acid and chromium contains a large amount of valuable metal substances such as iron, chromium, nickel, etc., so it is disposed of in landfill. Not only does it cost a lot of hazardous solid waste disposal, but it also needs to occupy a large amount of land resources for landfill, which will affect the lives of surrounding residents and the quality of groundwater

Method used

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  • A kind of treatment method of pickling wastewater in iron and steel industry

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Embodiment 1

[0026] Embodiment 1 adopts the method of the present invention to process the pickling wastewater discharged from the cold rolling section of a certain steel plant

[0027] 1. The pickling wastewater discharged from the cold rolling section of a steel factory was introduced into the regulating tank, and the total iron in the wastewater was measured to be 3000mg / L, the concentration of chromium ions was 800mg / L, the concentration of nickel ions was 200mg / L, and the concentration of fluoride ions was 2000mg / L. pH between 1-2;

[0028] 2. The wastewater is introduced into the chromium reduction pool from the adjustment pool. The chromium reduction pool is divided into a primary chromium reduction pool and a secondary chromium reduction pool. The wastewater flows through the primary chromium reduction pool and the secondary chromium reduction pool in turn. Each level of chromium reduction A sufficient amount of reducing agent sodium metabisulfite is added to the pool for 30 minute...

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Abstract

The invention discloses a method for treating pickling wastewater in iron and steel industry. The method comprises the following steps: a) introducing pickling wastewater into a regulating tank, a chromium reduction tank and a heavy metal catcher; b) separating heavy metal precipitate produced in reaction from clear liquor through an ultramicro separating machine, carrying out primary fluoride removal on the clear liquor in a fluoride removal filter; c) feeding the mixed solution subjected to primary fluoride removal into a primary precipitating tank for separating non-ferrous precipitate from water, then carrying out secondary fluoride removal on the clear liquor in a fluoride reaction tank; and d) feeding the mixed solution subjected to secondary fluoride removal into a secondary precipitating tank for separating non-ferrous precipitate from water, and emitting the separated clear liquor into a clear water tank for storage. The method has high metal particle separation efficiency, the ultramicro separation machine has concentration effect, so no concentration tank is required for separating the precipitate from the clear liquor to save space and the labor force, the indexes of iron, chromium, nickel, fluoride and the like in the clear liquor emitted from the secondary precipitating tank can all meet the national-level standard requirement.

Description

technical field [0001] The invention belongs to the field of environmental protection wastewater treatment, in particular to a treatment method for pickling wastewater in the iron and steel industry. Background technique [0002] With the rapid development of my country's industrial economy, it has led to the rapid development of the steel industry. Steel components must be pickled before cold rolling, electroplating, and spraying to remove surface oxides and produce pickling wastewater. The pickling wastewater is mainly Composition is SO 4 2- , H + , Fe 2+ , Na + , Cr 6+ , F - 、Me n+ , Ni, etc., where Cr 6+ , F - , Fe 2+ 、Me n+ as the main pollutant. [0003] The existing method of treating pickling wastewater adopts "chromium reduction + lime neutralization + precipitation + sand filtration". Add reducing agent and fully mix and react with wastewater to reduce hexavalent chromium to trivalent chromium, send the effluent to the pH adjustment tank, then put in Na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张鸣球黄祁杨明富
Owner JIANGSU BESITE WATER SCI & TECH
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