Anti-scaling treatment method for stainless steel acid waste water subsequent treatment

A treatment method, stainless steel technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as equipment scaling, and achieve the effect of eliminating scaling

Active Publication Date: 2012-02-15
中国冶金科工股份有限公司
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method that can so

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  • Anti-scaling treatment method for stainless steel acid waste water subsequent treatment
  • Anti-scaling treatment method for stainless steel acid waste water subsequent treatment

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[0031] The present invention will be further described below in conjunction with the embodiments and drawings.

[0032] The stainless steel acid wastewater subsequent treatment and anti-scaling treatment method provided by the present invention is a method for the subsequent treatment of stainless steel acid wastewater after first-level reaction, first-level flocculation, and first-level precipitation, and the method includes the following steps:

[0033] (1) Form Ca in wastewater 2+ The sediment:

[0034] The effluent after the first stage precipitation flows into the softening tank 1 by itself, and adding salt to the softening tank 1 makes the Ca in the second reaction tank 2+ A precipitate is formed, the dosage of carbonate is adjusted by frequency conversion, and the mass ratio with the calcium content in the effluent after the first-stage precipitation is 1:1;

[0035] (2) Flocculation:

[0036] The effluent softened by the softening tank 1 flows into the secondary flocculation ta...

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Abstract

The invention relates to an anti-scaling treatment method for stainless steel acid waste water subsequent treatment. The method comprises the following steps: (1) residual Ca<2+> in acid waste water which is subjected to lime neutralization, flocculation and precipitation is formed into precipitate of Ca<2+>; (2) flocculation is carried out, wherein the precipitate of Ca<2+> and other sludge formlarge alumen ustum; (3) precipitation is carried out; (4) pH value is regulated, wherein precipitated effluent flows into a final pH regulating pondage, the pH of water quality in the final pH regulating pondage is between 6 and 7 by adding hydrochloric acid; (5) filter is carried out, wherein after the performed steps, the Ca<2+> content in the water in the final pH regulating pondage is less than 150mg/l, SS content is 20mg/l, the effluent can meet the requirement of denitrification and subsequent treatment by utilizing filter of a sand filter, and the effluent is delivered to a denitrification facility for treatment. According to the method, the problems causing scaling and blockage of denitrification system pump and pipeline can be solved, so that the production and environmental-friendliness are facilitated, and the labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to the field of waste water, in particular to a method suitable for subsequent treatment of fouling of stainless steel waste water. Background technique [0002] Stainless steel acid wastewater contains HF, H 2 SO 4 、HNO 3 And iron ions, Ni, etc., the conventional treatment process is to add Ca(OH) 2 Neutralize and form CaF in water 2 , Fe(OH) 3 , Ni(OH) 2 , Cr(OH) 3 and CaSO 4 and other sediments to reduce the effluent F - Content, Cr 6+ 、Ni 2+ content, after precipitation, P After H adjustment and filtration, it is discharged. [0003] The stainless steel acid wastewater treatment process without denitrification treatment is: stainless steel acid wastewater → pump → primary neutralization → secondary neutralization → primary flocculation reaction → primary precipitation → P H adjustment→filter→exhaust. [0004] to remove F - And other ions, lime is often added in the process of lime neutralization, so that the Ca ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52
Inventor 郭旻易琴万焕堂
Owner 中国冶金科工股份有限公司
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