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Method for recovering metal at low cost from electroplating sludge and producing refined nickel sulfate

An electroplating sludge, low-cost technology, applied in the direction of improving process efficiency, etc.

Active Publication Date: 2021-02-02
温贵能
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The present invention aims at the current problems of electroplating sludge treatment, especially wet treatment of electroplating sludge, and provides a method for recovering metals from electroplating sludge at low cost and producing refined nickel sulfate

Method used

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  • Method for recovering metal at low cost from electroplating sludge and producing refined nickel sulfate

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Experimental program
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Effect test

Embodiment 1

[0057] Mass percentage (%) of main substances in electroplating sludge: CuO 1.70, NiO 1.44, ZnO 0.74, Cr 2 o 3 0.57,H 2 O 65.3.

[0058] In step (1), the electroplating sludge material is added to tap water at a liquid-to-solid ratio of 2:1; at a temperature of 30°C, turn on strong stirring, mix and make pulp for 2 hours, and sieve out sundries (bags, wood, plastic, etc.). Pulp machine slurry. After slurrying, the material is pumped into another reaction tank, and concentrated sulfuric acid is added under stirring conditions to control the final pH value of the solution to 1.5-2.5.

[0059] Step (2), adjust step (1) to the slurry with an end point pH value of 1.5 to 2.5, measure the ferrous content, add the theoretical amount of hydrogen peroxide (hydrogen peroxide mass percentage 28 to 35%), and oxidize the ferrous iron into trivalent Iron is prepared as material A; 20% sodium carbonate aqueous solution is prepared as material B in configuration mass percentage; tap water...

Embodiment 2

[0069] Embodiment 2 is compared with embodiment 1, except following difference, other is with embodiment 1:

[0070] In step (1), the electroplating sludge is added to the production reuse water at a liquid-to-solid ratio of 1.2:1, and the copper raffinate is extracted for slurrying.

[0071] The pre-prepared material C in the reaction tank for E.Z iron removal in step (2) is the post-material of E.Z iron removal produced in step (2) in Example 1, without the slurry before solid-liquid separation.

[0072] Step (5) Selection of extraction stages in the first stage: "1 stage for saponification, 7 stages for extraction, 4 stages for nickel washing, 4 stages for calcium, magnesium, copper and manganese washing, 4 stages for zinc washing, 3 for regeneration organic class". Acidity used: 0.6mol / L hydrochloric acid for washing nickel, 2.0mol / L hydrochloric acid for washing calcium, magnesium, copper, and manganese, 4mol / L sulfuric acid for zinc washing, and 6.0mol / L hydrochloric ac...

Embodiment 3

[0075] Embodiment 3 is compared with embodiment 1, except following difference, other is with embodiment 1:

[0076] In step (1), the electroplating sludge is added to the production reuse water at a solid-to-liquid ratio of 1.1:1, and the slag washing water in step (7) in Example 2 is used as the production reuse water.

[0077] Step (2) is the same as embodiment 2. The material C for E.Z iron removal is the slurry after E.Z iron removal in Example 2.

[0078] Step (3) The copper-specific extractant is selected from the "N902----aviation kerosene" system.

[0079] In step (5), both the first stage and the second stage of saponification are 20% by mass sodium carbonate solution. Selection of extraction stages in the first stage: "2 stages for saponification, 11 stages for extraction, 4 stages for nickel washing, 6 stages for calcium, magnesium, copper, and manganese washing, 5 stages for zinc washing, and 4 stages for organic regeneration." The selection of the second stage...

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Abstract

The invention relates to a method for recycling metal from electroplating sludge with low cost and producing refined nickel sulfate. The method comprises the following steps that the electroplating sludge is subjected to pulpifying, sundries are screened, sulfuric acid leaching is conducted, E.Z deironing is conducted through alkali, copper is extracted, a copper product is prepared, aluminum andchromium in copper extraction residue are removed deeply, impurities like calcium, magnesium, copper, manganese and zinc are removed by extraction, a zinc sulfate solution is produced, nickel is extracted and enriched to prepare refined nickel sulfate, and environment-friendly ferrochrome slag curing and sewage treatment are conducted. Chromium is left in the slag, copper, zinc and nickel are prepared into the product to be recycled through the extraction process, and the recovery efficiency of the main heavy metal elements is high. The raw materials and auxiliary materials are easy to obtainand cheap, and the cost advantage is obvious. Addition of fluoride ions is avoided, and the environment pressure is relieved. The comprehensive treatment cost is low, the electroplating sludge can beprocessed on a large batch, emission of poisonous waste is reduced, and the social benefits are obvious.

Description

technical field [0001] The invention relates to a method for recovering metals from electroplating sludge at low cost and producing refined nickel sulfate, especially suitable for low-grade heavy metal chromium, copper, nickel and zinc in electroplating sludge, for low-cost separation and comprehensive recovery of metals and production of Refined nickel sulfate. Background technique [0002] The electroplating industry is the main basic processing industry in my country. The electroplating sludge generated during the electroplating process belongs to HW17 in the China Environmental Protection Hazardous Waste List. Based on the calculation of 3-10 kg of sludge per ton of electroplating wastewater, the literature estimates that the total amount of electroplating sludge in China is about 10 million tons per year. [0003] Electroplating sludge is rich in heavy metals in electroplating wastewater. Its physical and chemical characteristics: it is an alkaline substance, generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B3/38C22B23/00C22B19/20C22B3/30
CPCY02P10/20
Inventor 温贵能
Owner 温贵能
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