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Treatment method for chromium-containing waste residue in steel industry

A technology of iron and steel industry and treatment method, applied in the field of waste slag treatment process of iron and steel industry, can solve problems such as secondary pollution and rebound, and achieve the effect of reducing chromium content

Inactive Publication Date: 2015-03-25
武汉钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What is more dangerous is that the chromium in the sludge will rebound in the concentration of Cr(VI) in the environment. With the leaching of surface water, it will be dissolved into the natural water body, causing secondary pollution.

Method used

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  • Treatment method for chromium-containing waste residue in steel industry
  • Treatment method for chromium-containing waste residue in steel industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Raw materials: chromium-containing waste slag from cold rolling process wastewater treatment in the iron and steel industry, its Cr 2 o 3 The content is 5.3% by mass.

[0026] (1) Put chromium-containing waste residue (hereinafter referred to as chromium residue) into the stirring tank, and then add hydrochloric acid solution (water:concentrated hydrochloric acid volume ratio is 1:1), the solid-liquid mass ratio of chromium residue to hydrochloric acid solution is 1:1 , to make a mixture.

[0027] (2) After the mixture is fully stirred for 10 minutes, add NaOH solution (concentration: 15-30%) to adjust the pH value to 5-6, and then filter to obtain the filtrate and filter residue. The filtrate is the combustion enhancer 1. The filter residue was tested by leaching, the total chromium: 16.8mg / L, hexavalent chromium <2.8mg / L.

Embodiment 2

[0029] Raw materials: chromium-containing waste slag from cold rolling process wastewater treatment in the iron and steel industry, its Cr 2 o 3 The content is 6.6%.

[0030] (1) Put chromium-containing waste slag (hereinafter referred to as chromium slag) into the stirring tank, and then add hydrochloric acid solution (water: concentrated hydrochloric acid is 1:1), the solid-liquid mass ratio of chromium slag and hydrochloric acid is 1: 4, and the Mixture.

[0031] (2) After the mixture is fully stirred for 30 minutes, add NaOH solution (concentration: 15-30%) to adjust the pH value to 5-6, and then filter to obtain the filtrate and filter residue. The filter residue was tested by leaching, the total chromium: 9.2mg / L, hexavalent chromium <2.1mg / L.

Embodiment 3

[0033] Raw materials: chromium-containing waste slag from cold rolling process wastewater treatment in the iron and steel industry, its Cr 2 o 3 The content is 26.36%.

[0034] (1) Put chromium-containing waste slag into a stirred tank for four-stage reverse pickling (the number of pickling stages can be reasonably designed according to the chromium content in chromium-containing waste slag), specifically, the chromium-containing waste slag is added to the 2-stage pickling The supernatant (that is, the pickling solution) is subjected to a first-stage stirring pickling, and then the supernatant and the liquid-solid phase are separated by settling, and the supernatant after the first-stage pickling is used as a mixed solution to enter the next process; the first-stage pickling The final liquid-solid phase is added to the supernatant after the 3-stage pickling (that is, the pickling solution) for 2-stage stirring pickling, and then the supernatant and the liquid-solid phase are ...

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Abstract

The invention relates to a treatment method for chromium-containing waste residue in the steel industry, aiming at solving the problem that the existing chromium-containing waste residue can pollute the environment, and is low in economic benefit. The technical scheme comprises the following steps of: putting the chromium-containing waste residue into a stirring kettle, and adding hydrochloric acid solution to be stirred and washed by acid, so that the soluble substances including the chromium in the chromium-containing waste residue can be dissolved; and filtering after the pH value of mixed solution is adjusted at 5-6, wherein the filter residue is chromium-free or low-chromium waste residue, and the filter liquor is taken as fire coal combustion improver. The treatment method is simple in technology, low in running cost and high in the harmless treatment degree of the chromium-containing waste residue, and can further obtain the coal-saving combustion improver which is high in additional value.

Description

technical field [0001] The invention relates to a process for treating waste slag in the iron and steel industry, in particular to a treatment method for chromium-containing waste slag in the iron and steel industry. Background technique [0002] The chromium content in the chromium-containing sludge after cold rolling and silicon steel chromium wastewater treatment varies with the type of alkali added. At present, there are two kinds of alkalis added to the chromium wastewater, one is adding sodium hydroxide solution, and the other is adding milk of lime. The following table is the composition of the sludge sample taken from the silicon steel and cold rolling chromium-containing wastewater treatment station, the chromium content is 3-18% (weight ratio). [0003] Typical composition of chromium-containing sludge from cold-rolled silicon steel / % [0004] Component Na 2 o MgO al 2 o 3 SiO 2 P 2 o 5 SO 3 K 2 o CaO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 吴高明韩军王世杰吴高宏
Owner 武汉钢铁有限公司
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