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A method for harmless disposal of electroplating sludge

A technology for electroplating sludge and smelting slag, which is applied in the direction of cement production, process efficiency improvement, solid waste removal, etc., can solve the problem of high processing cost, achieve the effect of maintaining reaction temperature, short processing time, and good recycling benefits

Active Publication Date: 2021-06-29
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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  • A method for harmless disposal of electroplating sludge
  • A method for harmless disposal of electroplating sludge
  • A method for harmless disposal of 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 the 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 pulverized coal is put into the furnace after mixing. The particle size of the material is 6-25mm, and the water content is 9%.

[0049] Put the g...

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Abstract

A method for harmless disposal of electroplating sludge. The invention mixes electroplating sludge, reducing agent and quartz sand according to a certain ratio, and mixes and granulates them in a granulator to obtain furnace materials; Put it into the smelting furnace, feed in natural gas and oxygen and control the reducing atmosphere to carry out reduction smelting to obtain glassy smelting slag and alloy. The smelting slag obtained in the present invention is no longer a hazardous waste with the characteristics of leaching toxicity, and can be used as building materials; the alloy is further separated and purified, and the reduction smelting can efficiently recover the valuable metals in the electroplating sludge, including copper and nickel. The recovery rate can reach more than 90%, the recovery benefit of valuable metals is good, the labor intensity is low, the processing time is short, the operation environment is friendly, and the process is mature and reliable.

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 Patents(China)
IPC IPC(8): B09B3/00
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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