Method for separating iron, chromium, nickel, copper and zinc from high-iron high-chromium electroplating sludge leachate

A technology of electroplating sludge and separation method, which is applied in the field of separation of iron, zinc, chromium, nickel, and copper in the leaching solution of high-iron and high-chromium electroplating sludge, so as to achieve the effects of reducing impurity ions, reducing saponification process, and improving yield and quality

Active Publication Date: 2018-09-25
HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, and provide a method for separating valuable metals in high iron and high chromium electric sludge leachate with simple process, short flow process and high efficiency. It can effectively solve the difficult problem of separate separation of chromium, iron, nickel, copper and zinc in the leach solution of high-iron and high-chromium electroplating sludge, and improve the recovery value of iron in the sludge. It is especially suitable for the metal separation process of the biological leach solution of high-iron and high-chromium electroplating sludge

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  • Method for separating iron, chromium, nickel, copper and zinc from high-iron high-chromium electroplating sludge leachate

Examples

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Effect test

Embodiment 1

[0043] The sludge selected in this example comes from a wastewater treatment plant in a surface treatment park in Wuxi, with a moisture content of about 65%, a dry basis containing 5.74% chromium, 7.7% iron, 0.54% copper, 0.54% nickel, and 3.87% zinc. Put 1 kg of wet sludge in a 5 L polypropylene stirred reactor, control the liquid-solid ratio to 5:1, adjust the pH value to 1.8 with sulfuric acid, stir at 500 rpm, and stir for 2.0 hours to complete the leaching. The chromium content in the leachate is 11.3 g / L , iron 10.56 g / L, copper 1.06 g / L, nickel 1.12 g / L, zinc 7.65 g / L.

[0044] According to the separation method of iron, chromium, nickel, copper and zinc in the high iron and high chromium electroplating sludge leach solution of the present invention, the copper, chromium, nickel, zinc and iron in the above sludge leach solution are sequentially separated, comprising the following steps, as figure 1 Shown: (1) Take 1 L of leaching solution and place it in the correspondi...

Embodiment 2

[0046] The sludge selected in this example comes from a wastewater treatment plant in a surface treatment park in Zhejiang, with a moisture content of about 58%, a dry basis containing 6.7% chromium, 18% iron, 2.1% copper, 1.6% nickel, and 5.7% zinc. Put 1 kg of wet-based sludge into a 5 L polypropylene stirred reactor, add acidophilic mixed bacteria solution (containing Acidithiobacillus ferrooxidans ATCC 23270 and Acidiphilium acidophilum ATCC 27807, each accounted for 50%) pulping, sulfuric acid to adjust the pH value to 1.5, stirring speed 500rpm, stirring for 8.0 hours to complete the leaching, chromium 13.27 g / L, iron 34.20 g / L, copper 4.12 g / L, nickel 3.17g / L, zinc 11.29 g / L, after washing the leaching slag, a harmless leaching slag was obtained, with a moisture content of about 60%. After drying, the main components were gypsum and ferric hydroxide, which accounted for 82% and 17% by mass respectively.

[0047] According to the separation method of iron, chromium, ...

Embodiment 3

[0049] In this example, an electroplating sludge high iron sulfate leaching solution in Shenzhen (containing chromium 15.28g / L, iron 23.7 g / L, copper 3.51g / L, nickel 11.5 g / L, zinc 10.3 g / L) was selected, and the leaching residue was washed to obtain The harmless leached slag has a moisture content of about 62%. After drying, the main component is gypsum, which accounts for about 88.9%. The total content of other heavy metals is less than 1%.

[0050] According to the separation method of iron, chromium, nickel, copper and zinc in the high iron and high chromium electroplating sludge leach solution of the present invention, the copper, chromium, nickel, zinc and iron in the above sludge leach solution are sequentially separated, comprising the following steps: (1) ) Pour 100 L of leaching solution into a stirring tank with a stirring linear speed of 5 m / s, add 650 g of industrial iron powder below -100 mesh to the rapidly stirring leaching solution, which is twice the amount re...

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Abstract

The invention provides a method for separating iron, chromium, nickel, copper and zinc from high-iron high-chromium electroplating sludge leachate. The method comprises the following steps: (1) addingiron powder into the leachate to obtain a copper powder product and replaced liquid; 2) adding iron powder into the replaced liquid to obtain reduced liquid; (3) adding a chromium precipitating agentinto the reduced liquid, and carrying out filtering to obtain chromium-precipitated liquid and a chromium precipitate; (4) adding the activator antimony salt and zinc dust into the chromium-precipitated liquid, carrying out a reaction, and then carrying out filtering to obtain nickel powder and nickel-removed liquid; (5) adding an acidic phosphate extraction agent into the nickel-removed liquid to extract zinc, then carrying out reextraction by using dilute sulfuric acid, subjecting a zinc-rich solution to concentration and crystallization to prepare a zinc salt product, and subjecting zinc raffinate to subsequent treatment; and (6) subjecting the zinc raffinate to concentration and crystallization to prepare ferrous sulfate heptahydrate, and returning distilled water for leaching. The separation method of the invention has the advantages of short process and high efficiency, and can effectively solve the problem difficulties in separate separation of chromium, iron, nickel, copper and zinc metals in the high-iron high-chromium electroplating sludge leachate.

Description

technical field [0001] The invention belongs to the field of multi-metal resource utilization in electroplating sludge, and in particular relates to a method for separating iron, chromium, nickel, copper and zinc in a leaching solution of high-iron and high-chromium electroplating sludge. Background technique [0002] At present, the treatment and disposal methods of electroplating sludge mainly include: solidification and stabilization technology, thermochemical incineration disposal, and wet recycling and resourceful treatment and disposal. The principle of co-processing waste in cement kilns in the incineration method is to use the high temperature generated during the cement incineration process to process various residues and waste liquids in urban waste as raw materials for cement. This technology combines waste disposal with the sustainable development of the cement industry, and minimizes pollution discharge. It is an important technical approach for the harmless, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B34/32C22B23/00C22B19/20C22B3/18C22B3/38C21B15/00
CPCC21B15/00C22B3/18C22B7/006C22B15/0091C22B19/26C22B23/0461C22B34/32C22B3/3842C22B3/3844C22B3/3846Y02P10/20
Inventor 赵邵安周洪波周文博陈军辉秦荣钢
Owner HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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