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Method for harmlessly treating electroplating sludge

A technology of electroplating sludge and smelting slag, which is applied in the direction of cement production and process efficiency improvement, which can solve the problems of high processing cost and achieve the effects of maintaining reaction temperature, short processing time and low labor intensity

Active Publication Date: 2020-04-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this scheme can recover most of the valuable metals, the cost of treatment is high, and a large amount of residue produced is still hazardous waste, which does not fundamentally solve the toxicity problem of electroplating sludge

Method used

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  • Method for harmlessly treating electroplating sludge
  • Method for harmlessly treating electroplating sludge
  • Method for harmlessly treating electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Electroplating sludge composition: Fe 18.23%, Si 3.02%, Al 4.11%, Ca 7.65%, Ba 0.34%, Cr 4.22%, Cu 6.95%, Ni 2.71%, Pb 0.82%, Zn 7.54%.

[0034] Coke, whose carbon content is 82.21%; industrial oxygen, whose volume percentage concentration of oxygen is ≥99%; quartz sand, whose SiO 2 The content is 91.59%; natural gas, its CH 4 Content ≥ 85%.

[0035] The electroplating sludge, quartz sand, and coke are weighed and batched, and the added quartz sand is controlled to meet the initial requirements of the smelting slag type as FeO and SiO 2 The mass ratio is 1.2:1, and the quality of the coke is controlled to be 20% of the mass of the electroplating sludge; then, the electroplating sludge, quartz sand, and coke are added to the granulator for mixing and granulation, and the particle size of the furnace material after mixing is It is 8-20cm long and has a water content of 6%.

[0036] Add the granulated materials into the melting furnace, control the melting temperature a...

Embodiment 2

[0046] Main components of electroplating sludge: Fe 16.45%, Si 3.45%, Al 4.42%, Ca 7.25%, Ba 0.35%, Cr 4.65%, Cu 7.25%, Ni 2.21%, Pb 0.83%, Zn 8.25%

[0047] Pulverized coal, whose carbon content is 72.32%; industrial oxygen, whose volume percentage concentration of oxygen is ≥ 99%, and SiO of quartz sand 2 The content is 92.33%; natural gas, its CH 4 Content ≥ 85%. .

[0048] The electroplating sludge, quartz sand, and pulverized coal are weighed and batched, and the added quartz sand is controlled to meet the initial requirements of the smelting slag type as FeO and SiO 2 The mass ratio is 1.8:1, and the quality of pulverized coal is controlled to be 30% of the mass of the electroplating sludge; then, the electroplating sludge, quartz sand, and pulverized coal are added to the granulator for mixing and granulation, and the mixed pulverized coal is put into the furnace The particle size of the material is 6-25mm, and the water content is 9%.

[0049] Add the granulated ma...

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Abstract

The invention relates to a method for harmlessly treating electroplating sludge. The method comprises the following steps that the electroplating sludge, a reducing agent and quartz sand are proportioned according to a certain ratio, and mixing and granulating are carried out in a granulator to obtain a furnace-in material; and the furnace-in material is added into a smelting furnace, natural gasand oxygen are introduced, reducing atmosphere is controlled to carry out reduction smelting, and glassy-state smelting slag and alloy are obtained. According to the method, the obtained smelting slagis no longer hazardous waste with leaching toxicity characteristics, and can be used as a building material and the like; and the alloy is further separated and purified, valuable metal in the electroplating sludge can be efficiently recovered through reduction smelting, the recovery rate of copper and nickel can reach 90% or above, the valuable metal is good in recovery benefit, low in labor intensity, short in treatment time, friendly in operation environment, and mature and reliable in process.

Description

technical field [0001] The invention relates to a pyrometallurgical process in the field of metallurgy, and is a method for effectively and harmlessly disposing of electroplating sludge. [0002] technical background [0003] Electroplating sludge refers to the solid waste produced by the electroplating factory to process its wastewater. At present, the main treatment method of electroplating wastewater is to add lye to form precipitation, which is the main source of electroplating sludge. It has the characteristics of easy accumulation, instability, and easy loss. If it is not properly handled and stacked randomly, it will cause serious secondary pollution. The direct consequence is that heavy metals such as copper, nickel, zinc, and chromium in the sludge will migrate along the path of sludge → soil → crops → human body under the action of rainwater leaching, causing regeneration pollution of surface water, soil, and groundwater. Endanger the biological chain and cause ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B7/00C22B5/10C22B15/00C22B23/02C04B7/147
CPCC04B7/147C22B1/24C22B5/10C22B7/001C22B15/0052C22B23/02Y02P10/20Y02P40/10
Inventor 张杜超任冠行杨天足刘伟锋陈霖刘若麟
Owner CENT SOUTH UNIV
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