Chromium slag processing method for chemical-biological coupling reduction of hexavalent chrome

A treatment method, hexavalent chromium technology, applied to the removal of solid waste, etc., to achieve the effect of simple process, simplified equipment, and accelerated dissolution

Inactive Publication Date: 2007-05-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings of the existing wet chemical reduction and microbial reduction and detoxification respectively. It is proposed to organically couple the chemical reduction and microorganisms to take their advantages and avoid their shortcomings, and finally achieve fast, efficient and low-cost. detoxification purpose

Method used

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  • Chromium slag processing method for chemical-biological coupling reduction of hexavalent chrome

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Take 1 ton of chromium slag A (the concentration of water-soluble hexavalent chromium in the slag is 1.5%, and the concentration of acid-soluble hexavalent chromium is 0.8%), add 1 ton of water, and use a ball mill to crush the chromium slag into 160-200 mesh, while ball milling , while adding 1 ton of solution containing 6% sulfuric acid and 4% ferrous sulfate to the ball mill, during the ball milling process, the pH value of the control system is 8.5-10.5;

[0021] 2) Transfer the ball-milled solid-liquid mixture to another stirred reactor, continue to add 1 ton of 15% dilute sulfuric acid and 16% ferrous sulfate mixed solution, then continue to stir for 1h, and the system temperature in the whole process is controlled at 20°C ;

[0022] 3) Add 0.5 tons of composite bacteria liquid composed of SRB, Pseudomonas putida and Escherichia coli into the reactor and mix with the mixture, continue to stir for 0.5h, then put it into another container and leave it for 2 days;...

Embodiment 2

[0025] 1) Take 1 ton of chromium slag B (the concentration of water-soluble hexavalent chromium in the slag is 0.7%, and the concentration of acid-soluble hexavalent chromium is 0.4%), add 2 tons of water, and use a ball mill to crush the chromium slag into 80-120 mesh, while ball milling , while adding 1 ton of 9% sulfuric acid and 4.0% sodium sulfite solution to the ball mill, during the ball milling process, the pH of the control system is 7.5-9.0;

[0026] 2) transfer the ball-milled solid-liquid mixture to another stirred reactor, continue to add 0.9 tons of 8% dilute sulfuric acid, and then continue to stir for 5 hours, and control the system temperature during the whole process to 90°C;

[0027] 3) Add 0.8 tons of composite bacteria liquid composed of SRB, Pseudomonas putida and Escherichia coli into the reactor, continue to stir for 0.5h, then put it into a container and leave it for 10 days;

[0028] The result: the concentration of hexavalent chromium in the water is...

Embodiment 3

[0030] 1) Take 1 ton of chromium slag C (the concentration of water-soluble hexavalent chromium in the slag is 1.0%, and the concentration of acid-soluble hexavalent chromium is 0.6%), add 1 ton of water, and use a ball mill to crush the chromium slag into 120-160 mesh, while ball milling , while adding 1 ton of solution containing 2% sulfuric acid to the ball mill, during the ball milling process, the pH value of the control system is 8.5-9.5;

[0031] 2) Transfer the ball-milled solid-liquid mixture to another stirred reactor, continue to add 1.0 tons of 15% dilute sulfuric acid and 1.0 tons of 4% sodium sulfide solution, and then continue to stir for 2 hours. The system temperature in the whole process is controlled at 90°C ;

[0032] 3) Add 0.5 ton of composite bacteria liquid composed of SRB, Pseudomonas putida and Escherichia coli into the reactor, continue to stir for 1 hour, then put it into a container and leave it for 6 days;

[0033] The result: the concentration o...

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Abstract

The invention relates to a chromium slag treatment when coupling and reducing hexavalent chromium from chromium slag, wherein said method comprises using wet method to break, and adding the solution with acid and reducer, controlling the pH value, reducing the density of hexavalent chromium; transferring the liquid-solid mixture to another reactor, adding acid and reducer, mixing to reduce the hexavalent chromium; adding anaerobe, emerging. The acid can be sulfuric acid, etc; the reducer can be sulfite, etc; the anaerobe can be the mixture of SRB, Pseudomonas putida and Escherichia coli.

Description

field of invention [0001] The invention relates to a method for comprehensive treatment of chromium slag, in particular to a chromium slag treatment method for chemical-biological coupling reduction of hexavalent chromium in chromium slag. Background technique [0002] Chromium slag is a solid waste produced during the production of chromium salts. At present, my country mainly adopts a calcium-fired process to produce chromium salts, and every 1 ton of chromium salt products needs to discharge 2-2.5 tons of waste residue containing hexavalent chromium (0.5-2% by weight) into the environment. Hexavalent chromium in chromium slag can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes, causing blood in the stool, vomiting, diarrhea, rhinitis, nasal septum erosion, bronchial asthma, lung cancer and bronchial cancer and other lesions. [0003] The composition of chromium slag is relatively complex, and its utilization value is not gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 曹宏斌张懿李玉平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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