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Curing agent for treatment of electroplating sludge, and preparation method and application method thereof

A technology of electroplating sludge and curing agent, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low market applicability, complicated treatment process, etc., to overcome potential hazards and facilitate process operation , Accelerate the effect of hydration reaction

Inactive Publication Date: 2016-04-20
湖南中车环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high requirements on the pretreatment of electroplating sludge, which requires dehydration and drying treatment. The treatment process is complicated and the market applicability is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This example deals with chromium-containing electroplating sludge with a moisture content of 78%.

[0024] Put the sludge in the mixer, add electroplating sludge curing agent and appropriate amount of water, the mass ratio of curing agent and hydrated sludge is 1:1:0.8, mechanically stir to make it evenly mixed, the sludge gradually hardens, stop Stirring, granulation, static curing at room temperature for 3 days. The leaching rate of chromium is about 0.013%, the strength is 3.5MPa, and the pH value of the aqueous solution is 7, which can meet the requirements of landfill and construction fill.

[0025] The above-mentioned curing agent is made by mixing cement, river sand, sodium silicate powder and activated alumina. The mass percentage of each raw material is: cement 75%, river sand 11%, sodium silicate 8%, and activated alumina 6%.

[0026] Among the above raw materials, the cement is a mixture of ordinary Portland cement and ordinary sulphoaluminate cement, and th...

Embodiment 2

[0028] This example deals with chromium-containing electroplating sludge with a moisture content of 82.5%.

[0029] Put the sludge in the mixer, add electroplating sludge curing agent and appropriate amount of water, the mass ratio of curing agent, water and sludge is 1:1:0.6, mechanically stir to make it evenly mixed, the sludge gradually hardens, Stirring was stopped, and it was maintained at room temperature for 2 days. Granulated, the chromium leaching rate is about 0.021%, and the strength is 3.2MPa, which can meet the requirements of landfill and construction fill.

[0030] The curing agent is made by mixing cement, river sand, sodium silicate powder, and powdered activated alumina. The mass percentage of each raw material is: cement 75%, river sand 10%, sodium silicate 5%, and activated alumina 10%.

[0031] The cement is a mixture of ordinary Portland cement and ordinary sulphoaluminate cement, and the mass ratio of ordinary Portland cement to sulphoaluminate cement i...

Embodiment 3

[0033] This example deals with chromium-containing electroplating sludge with a moisture content of about 85%.

[0034] Dosing and stirring in situ in the sludge stacking plant, adding electroplating sludge curing agent and appropriate amount of water, the mass ratio of curing agent, water and sludge is 1:1:1, mechanical stirring makes it evenly mixed, and the sludge gradually becomes Hard, stop stirring, granulate, after static curing at room temperature for 2 days, the chromium leaching rate is about 0.023%, and the strength is 3.1MPa, which can meet the requirements of landfill and building fill.

[0035] The curing agent is composed of cement, river sand, sodium silicate powder, and powdered activated alumina. The percentages of each raw material in mass are: cement 79%, river sand 10%, sodium silicate 5%, and activated alumina 6%.

[0036] The cement is a mixture of ordinary Portland cement and ordinary sulphoaluminate cement, and the mass ratio of ordinary Portland cemen...

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Abstract

The invention relates to a curing agent for treatment of electroplating sludge. The curing agent comprises the following raw materials in percentage by weight: 75%-79% of cement, 10%-15% of sands, 5%-8% of sodium silicate and 6%-10% of activated aluminium oxide; the invention further discloses a preparation method and an application method of the curing agent. The curing agent has a wide application range, and overcomes potential hazards due to secondary environmental pollution of electroplating heavy metal sludge.

Description

technical field [0001] The invention relates to a hazardous waste harmless process, in particular to a curing agent for treating electroplating sludge, a preparation method and an application method thereof. Background technique [0002] Electroplating sludge is a muddy product produced after electroplating wastewater treatment, which contains a large amount of toxic heavy metals such as chromium, cadmium, copper, nickel, zinc, etc., and is a typical hazardous waste pointed out in the "National Hazardous Waste List". The methods for treating electroplating sludge include stabilization / solidification method, thermochemical treatment, humidification treatment, etc. At present, stabilization and solidification technology is an important method to deal with electroplating sludge. Its purpose is to make the heavy metals in electroplating sludge chemically inert and contained, so as to reduce the danger of electroplating sludge and facilitate transportation and landfill. Commonly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B18/04
CPCY02W30/91C04B28/06C04B40/0039C04B2111/00784C04B7/02C04B14/068C04B22/08C04B22/06C04B18/0481C04B7/32
Inventor 胡妙然曲春明荣江秀洪银海吴小林
Owner 湖南中车环境工程有限公司
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