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Method for cooperatively treating chromium-containing waste water by pelletizing process

A technology for synergistic treatment of chromium wastewater, applied in metallurgical wastewater treatment, chemical instruments and methods, reduced water/sewage treatment, etc., can solve problems such as increased transportation costs and risks, increased water treatment costs, and increased water treatment difficulty, achieving It has environmental and social benefits, reduces the risk of transshipment, and reduces the effect of procedures and treatment costs

Active Publication Date: 2020-07-10
宝武集团环境资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the chemical reduction method is used, there are still the following disadvantages: (1) the solid-liquid separation needs to be carried out by pressure filtration and dehydration in the whole process, which increases the process cost; (2) the resin in the filter residue is adsorbed and wrapped with a small amount of Cr 6+ Cause potential harm; (3) The filtrate contains higher soluble resin and COD (chemical oxygen demand), which increases the difficulty of water treatment and correspondingly increases the cost of water treatment
In addition, for the chromium-containing wastewater produced by steel plants, it is usually outsourced for disposal, which will also increase transportation costs and risks

Method used

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  • Method for cooperatively treating chromium-containing waste water by pelletizing process
  • Method for cooperatively treating chromium-containing waste water by pelletizing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Chromium (Cr 6+ ) Wastewater treatment.

[0055] S1, reduction, adding sulfuric acid with a mass fraction of 98% to the chromium-containing wastewater for acidification, adjusting the pH value to 2; then adding Na 2 S 2 o 5 Cr in chromium-containing wastewater 6+ reduced to Cr 3+ , where Na 2 S 2 o 5 Cr in chromium-containing wastewater 6+ The mass ratio of is 3.8; Add the NaOH solution that concentration is 40% again in the chromium-containing waste water, adjust pH value to 7.5, make Cr 3+ With Cr(OH) 3 Form precipitation, forming Cr-containing 3+ waste water;

[0056] S2, the first pelletizing process, the reduced chromium-containing wastewater is sent into the mixer through the pipeline, partly replacing the industrial water in the original system, so that the various zinc-containing dusts in the mixer are fully mixed, and the zinc-containing waste water is obtained. Chromium mixture, and then the zinc-chromium mixture is sent to the disc pelletizer to o...

Embodiment 2

[0061] Chromium (Cr 6+ ) Wastewater treatment.

[0062] S1, reduction, acidification by adding phosphoric acid with a mass fraction of 97% to the chromium-containing wastewater, adjusting the pH value to 3; then adding Na 2 S 2 o 5 Cr in chromium-containing wastewater 6+ reduced to Cr 3+ , where Na 2 S 2 o 5 Cr in chromium-containing wastewater 6+ The mass ratio of is 3.7; Then add 40% NaOH solution to the chromium-containing wastewater, adjust the pH value to 7.8, make Cr 3+ With Cr(OH) 3 Form precipitation, forming Cr-containing 3+ waste water;

[0063] S2, the first pelletizing process, the reduced chromium-containing wastewater is sent into the mixer through the pipeline, partly replacing the industrial water in the original system, so that the various zinc-containing dusts in the mixer are fully mixed, and the zinc-containing waste water is obtained. Chromium mixture, and then the zinc-chromium mixture is sent to the disc pelletizer to obtain the first zinc-ch...

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Abstract

The invention discloses a method for cooperatively treating chromium-containing waste water by a pelletizing process. The method comprises steps as follows: Cr<6+> in the chromium-containing waste water is reduced into Cr<3+>, and Cr(OH)3 precipitate is formed; the reduced chromium-containing waste water is mixed with zinc-containing dust, and a zinc and chromium contained mixture is obtained, andfirst zinc and chromium contained pellet is prepared by a first pelletizing process; the zinc-containing dust is mixed uniformly with industrial water, a zinc-containing mixture is obtained, the first zinc and chromium contained pellet coated with the zinc-containing mixture is prepared by a second pelletizing process, a zinc-containing coating layer is formed, and a second zinc and chromium contained pellet is prepared; the second zinc and chromium contained pellet is sent to a rotary hearth furnace for reduction, and a metallized pellet is prepared; and the metallized pellet is added to blast furnace ironmaking components for smelting, and chromium in the metallized pellet is completely melted into molten iron. According to the method for cooperatively treating the chromium-containing waste water by the pelletizing process, the chromium-containing waste water produced in a steel and iron plant can be 100% consumed in the plant, outsourcing treatment is not needed, and the method hasenvironment-friendly and social benefits while realizing reducing and harmless treatment.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for co-processing chromium-containing wastewater in a pelletizing process, which is mainly used for treating chromium-containing wastewater in iron and steel plants to achieve reduced and harmless treatment. Background technique [0002] Chromium and its compounds are widely used in industry. In industries such as metallurgy, electroplating, leather, paint, and photography, a large amount of chromium-containing wastewater will be produced every day. The chromium in chromium-containing wastewater is mainly in the form of hexavalent (Cr 6+ ) and trivalent (Cr 3+ ) exists in the form of hexavalent chromium, which is about 100 times that of trivalent chromium, and belongs to a kind of hazardous waste. [0003] The application number is 201410404014.X, which discloses a chemical reduction-assisted electrochemical method for removing hexavalent chromium in water. The metho...

Claims

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Application Information

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IPC IPC(8): C22B1/24C21B5/00C02F1/70C02F101/22C02F103/16
CPCC02F1/70C02F2101/22C02F2103/16C21B5/00C22B1/2406
Inventor 曹志成彭程刘晓轩刘安治刘长正吴正怡易达尔王仕满李生忠崔慧君李国良张元玲
Owner 宝武集团环境资源科技有限公司
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