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Heavy metal sludge recycling and innocent treatment method

A heavy metal sludge and treatment method technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of resource utilization and harmless treatment, etc. Achieve good economic and social benefits, high metal recovery rate, and low production costs

Active Publication Date: 2012-05-02
惠州TCL环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this process is that the valuable metals in it are not recycled, and the dual purposes of recycling and harmless treatment are not achieved.

Method used

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  • Heavy metal sludge recycling and innocent treatment method
  • Heavy metal sludge recycling and innocent treatment method
  • Heavy metal sludge recycling and innocent treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Composition of copper sludge: Cu 3.07%, Fe 1.34%, Si 1.44%, Ca 1.05%, Al 0.70%, Zn 0.09%, S 0.31%, Ni<0.01%, moisture 82.51%, others 9.48%.

[0022] The treatment method sequentially includes five steps: deep sludge dehydration, crushing and drying, batching and block making, smelting and flue gas treatment.

[0023] (1) Deep dehydration of sludge.

[0024] Put the copper sludge with the above components into the sludge mixing tank, add water to prepare a slurry with a water content of 94%, and then use a diaphragm pump to feed and filter for 90 minutes. The feed pressure is controlled at 0.8MPa. After the feed is filtered , switch to a screw pump with a water inlet pressure of 1.6MPa to feed water to the diaphragm filter plate, and press and dehydrate the filter cake for 40 minutes to obtain a deeply dehydrated filter cake.

[0025] The waste water generated in the deep dehydration process is purified and treated up to the standard, and then used as cooli...

Embodiment 2

[0034] Example 2: Composition of nickel sludge: Ni 1.03%, Fe 1.47%, Cu 0.16%, Si 1.58%, Ca 0.92%, Al 0.77%, Zn 0.24%, S 0.36%, moisture 84.14%, others 9.33% .

[0035] The treatment method sequentially includes five steps: deep sludge dehydration, crushing and drying, batching and block making, smelting and flue gas treatment.

[0036] (1) Deep dehydration of sludge.

[0037] Put the nickel sludge with the above components into the sludge mixing tank, add water to prepare a slurry with a water content of 92%, and then use a diaphragm pump to feed and filter for 80 minutes, and the feed pressure is controlled at 0.8MPa. After the feed is filtered , switch to a screw pump with a water inlet pressure of 1.6MPa to feed water to the diaphragm filter plate, and press and dehydrate the filter cake for 30 minutes to obtain a deeply dehydrated filter cake.

[0038] The waste water generated in the deep dehydration process is purified and treated up to the standard, and then used as c...

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Abstract

The invention relates to a heavy metal sludge recycling and innocent treatment method. The treatment method comprises the following steps of: deeply dehydrating sludge until the water content is less than 55 percent and the weight of the dehydrated sludge is reduced to be 33 to 56 percent of the original weight; crushing the dehydrated sludge and drying the crushed sludge in a sludge dryer until the water content is 6 to 12 percent; mixing the dried sludge, a flux and an adhesive, and preparing blocks or balls; and smelting coke and the block material or ball-shaped material in a smelting furnace. The method has the advantages of high material utilization rate, short process flow, high metal recovery rate, simple operation of equipment, low investment and low production cost, and has goodeconomic and social benefits.

Description

technical field [0001] The invention relates to the field of industrial hazardous waste treatment, in particular to a resourceful and harmless treatment method for heavy metal sludge. Background technique [0002] With the rapid development of smelting industry, metal processing industry, machine manufacturing industry, electroplating industry and other industries, the amount of heavy metal wastewater generated in the industrial production process is increasing, and the content of heavy metals is also increasing. In line with the purpose of energy saving and emission reduction , it is imperative to treat this type of wastewater. The materials to be treated in the present invention mainly come from copper-containing or nickel-containing sludge produced in the process of treating heavy metal waste liquid in the above-mentioned industries. [0003] As the "final state" of heavy metal wastewater, copper- or nickel-containing sludge generally has a moisture content of 75% to 85%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/02C02F11/00C02F11/12
CPCY02P10/20
Inventor 王治军谭希发曾钿
Owner 惠州TCL环境科技有限公司
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