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Recycling treatment method of electroplating sludge

A technology for electroplating sludge and treatment methods, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve problems such as incomplete alkali conversion of chromium phosphate and impure chromium hydroxide slag, and improve metal recovery rate The utilization rate of alkali and alkali, the effect of improving the efficiency of alkali leaching and eliminating the discharge of waste residue

Active Publication Date: 2021-05-28
北京首创环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can separate Cr, Fe preferably, and Cr yield is better, but chromium phosphate alkali transreaction is not thorough, makes the chromium hydroxide slag that finally obtains not pure, still contains more phosphorus usually, can only As enriched slag sent to chromium plant for treatment

Method used

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  • Recycling treatment method of electroplating sludge
  • Recycling treatment method of electroplating sludge
  • Recycling treatment method of electroplating sludge

Examples

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Embodiment 1

[0078] This embodiment provides a resource treatment method of electroplating sludge (such as figure 1 shown), including the following steps:

[0079] S1: Ingredients: The electroplating sludge with different phosphorus content is mixed according to a certain ratio, and 1kg of raw materials is prepared, with a moisture content of 60.58%. The dry basis components are: Ni 6.30%, Zn 5.01, Cr 6.79%, Fe 3.34%, Al 0.80%, P 10.11% (the sum of the molar weights of Cr, Fe, and Al is 1.08±0.01 times the molar weight of P).

[0080] S2: Low-acid leaching: Put the prepared material in step S1 into the reactor, the liquid-solid ratio is 6:1 (calculated on a dry basis), start stirring, add sulfuric acid, and perform low-acid leaching, and control the pH of the leaching end point to 3.0, The temperature is 65°C, react for 2 hours, filter after the reaction, and use the low-acid leaching liquid and the low-acid leaching residue for later use.

[0081] S3: High-acid leaching: Put the low-aci...

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Abstract

The invention relates to the field of resource utilization of electroplating sludge, in particular to a recycling treatment method of electroplating sludge. The recycling treatment method comprises the following steps: carrying out oxidation alkaline leaching on electroplating sludge after leaching, copper extraction and impurity removal, wherein the oxidation alkaline leaching is carried out in sodium hydroxide and an oxidizing agent, and the terminal alkalinity of the oxidation alkaline leaching is 10-80 g / L in terms of sodium hydroxide. According to the method, high-quality crystallized copper salt, crystallized nickel salt, crystallized zinc salt, crystallized sodium salt, chromium phosphate, sodium phosphate and other products can be produced, detoxified gypsum can be used for cement and brick making, ferric hydroxide and aluminum hydroxide can be sent to a steel plant or an aluminum plant for use, and no waste residues are discharged in the whole technological process. All process wastewater is recycled, so that zero discharge of wastewater can be realized. Copper, nickel, zinc, chromium, phosphorus and the like in the electroplating sludge are all efficiently recovered, the technological process is simple, the production efficiency is high, industrialization is easy to achieve, the equipment composition is simple, the product quality is good, and the recovery rate is high.

Description

technical field [0001] The invention relates to the field of resource utilization of electroplating sludge, in particular to a resource treatment method of electroplating sludge. Background technique [0002] Electroplating wastewater generally contains pollutants such as nickel, copper, zinc, chromium, cadmium, gold, silver, acid, alkali, cyanide, COD, etc., and the electroplating plant is classified and discharged to the sewage treatment plant in the electroplating park or large-scale electroplating plants with sewage treatment facilities. Plant for processing, generally Cr 6+ reduced to Cr 3+ , and then remove heavy metals through physical and chemical precipitation to obtain electroplating sludge, and then carry out biochemical treatment of COD, cyanide, etc., after the treatment reaches the standard, it will be reused or discharged as reclaimed water. According to different components, electroplating sludge is generally divided into electroplating separated sludge and...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/30C22B3/38C22B3/44C22B19/30C22B21/00C22B23/00C22B34/32C22B15/00C01G49/02C01B25/37C01B25/30C22B3/08C22B3/12
CPCC22B7/008C22B7/007C22B3/44C22B34/32C22B21/0023C22B23/0453C22B23/043C22B19/22C22B19/30C22B15/0071C22B15/0086C01G49/02C01B25/37C01B25/30Y02P10/20
Inventor 辛国伟吴立臻曹占强葛亚军戴小东潘勇进
Owner 北京首创环境科技有限公司
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