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A kind of recycling method of electroplating waste slag

A technology for electroplating waste residue and leaching, which is applied in the field of electroplating waste residue recycling, can solve the problems of inability to form a systematic recycling system, narrow application range, single use, etc., and achieves the realization of circular economic benefits, reduction of recycling costs, labor and labor savings. The effect of power

Active Publication Date: 2015-10-28
广西鸿淳环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of existing methods in the recycling of electroplating waste slag that are too single, unable to form a systematic recycling system, narrow in scope of application, incomplete and incomplete recycling, and the final waste slag still needs subsequent harmless treatment. , to provide a method of recycling electroplating waste residues that can realize circular economic benefits. Through key steps such as oxidation leaching, filtration separation, graded precipitation, and reduction stabilization, the treated electroplating waste residues can be reused as resources, and the obtained filter mud can be reused. Used as trace element biological humic acid compound fertilizer, the harmless sediment produced by waste liquid and waste residue treatment can be used as raw materials for cement or bricks, and the heavy metal compounds precipitated by classification can be made into high-value heavy metal products, and can also be used in smelters metal smelting

Method used

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  • A kind of recycling method of electroplating waste slag
  • A kind of recycling method of electroplating waste slag

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Oxidative leaching: Soak electroplating waste residue and water for 4~5 hours according to the ratio of solid to liquid volume of 1:8, and add sodium hypochlorite in aeration at the same time, and the air flow rate is 0.9m 3 / min, the amount of sodium hypochlorite is 0.8% of the weight of the electroplating waste residue, and the stirring speed is 200rmp, so that the pollutants are converted into water-soluble compounds and dissolved into the water phase. The pH value in the dissolution reaction tank is controlled between 8 and 9, and the heavy metal ions in the waste residue Converted into water-soluble carbonates and hydroxides, after the oxidation leaching process is completed in the dissolution reaction tank, the oxidation leaching slurry is obtained. The dissolution reaction tank is an underground device, which is convenient for using a forklift to directly shovel the sludge waste and feed into the reactor, saving labor and power.

[0025](2) Filtration and...

Embodiment 2

[0030] (1) Oxidative leaching: Soak electroplating waste residue and water for 3~4 hours according to the ratio of solid to liquid volume of 1:9, and add redox agent hydrogen peroxide with aeration at the same time, and the air flow rate is 0.6m 3 / min, the amount of hydrogen peroxide is 0.5% of the weight of the electroplating waste residue, and the stirring speed is 250rmp, so that the pollutants are converted into water-soluble compounds and dissolved into the water phase, and the pH value in the dissolution reaction tank is controlled between 8 and 9. The heavy metal ions are converted into water-soluble carbonates and hydroxides, and after the oxidation leaching process is completed in the dissolution reaction tank, the oxidation leaching slurry is obtained. The dissolution reaction tank is an underground device, which is convenient for using a forklift to directly shovel the sludge waste and feed into the reactor, saving labor and power.

[0031] (2) Filtration a...

Embodiment 3

[0036] (1) Oxidative leaching: Soak electroplating waste residue and water for 4~5 hours according to the ratio of solid to liquid volume of 1:6, and add redox agent hydrogen peroxide with aeration at the same time, and the air flow rate is 0.8m 3 / min, the amount of redox agent is 1.2% of the weight of electroplating waste residue, and the stirring speed is 900rmp, so that the pollutants are converted into water-soluble compounds and dissolved into the water phase, and the pH value in the dissolution reaction tank is controlled between 8~9. The heavy metal ions are converted into water-soluble carbonates and hydroxides, and after the oxidation leaching process is completed in the dissolution reaction tank, the oxidation leaching slurry is obtained. The dissolution reaction tank is an underground device, which is convenient for using a forklift to directly shovel the sludge waste and feed into the reactor, saving labor and power.

[0037] (2) Filtration separation: Sed...

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Abstract

The invention relates to an electroplating waste slag recycling method. The electroplating waste slag recycling method comprises the main process steps of firstly performing oxidation leaching on electroplating sludge waste slag, namely diluting with water to form a solution and performing water phase leaching, and further filtering and separating an oxidation leaching suspension solution to obtain filtration sludge and filtrate; performing reduction and stabilization on the filtration sludge, then recovering the filtration sludge as a fertilizer or a raw material of a building material, sending the filtrate into a wastewater treatment system, controlling different conditions (pH value), performing fractional precipitation to obtain precipitation compounds of various heavy metals for recycling, and recycling the metals with low contents as trace elements in a centralized manner. Wastewater is recycled after treatment for diluting the solution or washing, landscaping and sanitation. Finally, an YHD special stabilizer can be used for performing reduction and stabilization on the residual metals in the filtration sludge and the filtrate to prevent the residual metals from performing oxidation reaction with the water. According to the electroplating waste slag recycling method provided by the invention, the integral optimization targets and effects of clean production cyclic economy with zero emission, no pollution, full utilization and increased benefits of the waste slag of enterprises in the electroplating industry can be realized.

Description

technical field [0001] The invention belongs to the technical field of industrial electroplating waste residue treatment, and in particular relates to a recycling method for electroplating waste residue. Background technique [0002] Electroplating waste residue is the waste generated by the daily production of the electroplating factory. It mainly includes two parts, one part is the electroplating waste residue that has been accumulated before, and the other is the waste residue sludge newly generated during the precipitation and separation during the wastewater treatment process. It is a hazardous waste with a very complicated composition. , containing a variety of heavy metal ions and organic substances in varying quantities, has become a serious source of re-pollution. If it is directly buried or stacked in the open air, it will be soaked and oxidized by groundwater and rainwater, and it will be polluted endlessly for years, with serious consequences and endless troub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 黄名钟程洁黄乐
Owner 广西鸿淳环保科技有限公司
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