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Cooperative treatment method of chromium-containing heavy metal sludge and iron-containing dust sludge

A heavy metal sludge and co-processing technology, which is applied in the direction of improving process efficiency and can solve the problem of low recovery rate

Active Publication Date: 2019-07-26
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pyrotechnic process is suitable for treating sludge with high chromium content, but there are problems such as low recovery rate for sludge with low chromium content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] TFe, Cr mass percent content is respectively 17.25% and 2.18% chromium-containing heavy metal sludge and TFe mass percent content is 65.03% iron-containing dust sludge by dry weight mass ratio is: chromium-containing heavy metal sludge: iron-containing dust sludge =70: 30 ratio mixing, obtain compound, the total iron mass percent content TFe of the compound of preparation is 31.58%; In compound, press mass fraction respectively to add 3%, 2%, 10%, 10% successively Calcium oxide, quartz, sodium carbonate, sodium chloride, mix well and make pellets, after the green pellets are dried, use bituminous coal as the reducing agent, the dosage is 20% of the weight of the green pellets, directly reduce at 1250°C for 30min, and the calcined sand Grind until the content of -0.074mm accounts for 85%, and use wet weak magnetic separation to separate under the magnetic field strength of 1400Oe to obtain ferrochromium and tailings. After analysis, the mass percent contents of TFe and C...

Embodiment 2

[0020] TFe, Cr mass percentage content are respectively 36.54% and 2.86% chromium-containing heavy metal sludge and TFe mass percentage content are 50.64% iron-containing dust sludge by dry weight mass ratio: chromium-containing heavy metal sludge: iron-containing dust sludge =85: 15 ratio mixing, obtain compound, the total iron mass percentage content TFe of the compound of preparation is 38.69%; %Add calcium oxide, quartz, sodium carbonate, sodium chloride, calcium chloride in sequence, mix well and make pellets, after drying the green pellets, use anthracite as reducing agent, the dosage is 15% of the weight of the green pellets, at 1200℃ Direct reduction for 60 minutes, grinding the calcine until the content of -0.074mm accounts for 75%, and sorting by wet weak magnetic separation at a magnetic field strength of 1000Oe to obtain ferrochromium and tailings. After analysis, the mass percent contents of TFe and Cr in the ferrochromium alloy were 91.22% and 6.11%, respectively...

Embodiment 3

[0022] TFe, Cr mass percent content is respectively 25.79% and 2.73% chromium-containing heavy metal sludge and TFe mass percent content is 40.56% iron-containing dust sludge by dry weight mass ratio is: chromium-containing heavy metal sludge: iron-containing dust sludge =95:5 ratio mixing, obtain compound, the total iron mass percentage content TFe of the compound of preparation is 26.53%; %Add calcium oxide, quartz, sodium carbonate, sodium chloride, borax in sequence, mix well and make pellets, after the green pellets are dried, use coke as reducing agent, the dosage is 10% of the weight of the green pellets, and directly reduce at 1150°C For 90 minutes, grind the calcine until the content of -0.074mm accounts for 65%, and use wet-type weak magnetic separation to separate under the magnetic field strength of 600Oe to obtain ferrochromium and tailings. After analysis, the mass percent contents of TFe and Cr in the ferrochromium alloy were 90.87% and 9.39%, respectively, and ...

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Abstract

The invention relates to the field of dangerous solid waste environmental protection treatment and resource generation, and specifically discloses a cooperative treatment method for chromium-containing heavy metal sludge and iron-containing dust sludge. The method comprises the following steps of: mixing the chromium-containing heavy metal sludge with the iron-containing dust sludge, thereby preparing a mixture with total iron mass percentage content higher than or equal to 25%; then, adding a fixing agent and a flux to uniformly mix and pelletizing, thereby obtaining green pellets; drying thegreen pellets, mixing the green pellets with a reducing agent, directly reducing the green pellets mixed with the reducing agent to obtain a roasted product; and adopting wet-type weak magnetic separation after roasted product ore grinding, thereby obtaining a ferrochrome alloy product and tailings. Through cooperative treatment for the chromium-containing heavy metal sludge and the iron-containing dust sludge, the ferrochrome alloy product can be obtained, and the obtained tailings can be treated as common solid waste; and meanwhile, harmless and resourceful treatment of the chromium-containing heavy metal sludge and the iron-containing dust sludge is realized.

Description

technical field [0001] The invention relates to the field of environmental protection treatment of hazardous solid waste and resource regeneration, in particular to a method for synergistic treatment of chromium-containing heavy metal sludge and iron-containing dust sludge. Background technique [0002] Chromium plating is one of the three major types of electroplating. The chrome plating process produces a large amount of wastewater. After neutralization treatment, a large amount of heavy metal sludge containing chromium will be generated, which is a hazardous solid waste clearly defined by the state. At the same time, chromium itself is a non-renewable resource, and there is a shortage of chromium resources in my country. Therefore, chromium-containing electroplating sludge has dual attributes of pollution and resource. How to effectively recycle chromium in electroplating sludge has become a problem for researchers. Hot spots of concern. [0003] Iron-containing dust main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B7/00C22B34/32
CPCC22B1/2406C22B7/001C22B34/32Y02P10/20
Inventor 刘勇刘牡丹周吉奎马致远
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI