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Method for extracting electrodeposited zinc from zinc oxide powder in ammonium chloride solution system

A technology of ammonium chloride solution and zinc oxide powder is applied in the improvement of process efficiency, photography process, instruments and other directions, which can solve the problems of high cost, long process flow, and fluorine-chlorine waste water, etc., and achieves short process and high production load. The effect of controlling and solving environmental problems

Inactive Publication Date: 2014-08-27
戴兴征
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for directly processing zinc oxide powder to produce electro-deposited zinc without specially setting up zinc oxide powder to remove fluorine and chlorine. The method has the problems of long process flow, high cost and generation of fluorine and chlorine waste water

Method used

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  • Method for extracting electrodeposited zinc from zinc oxide powder in ammonium chloride solution system

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Experimental program
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Effect test

Embodiment 1

[0051] The zinc oxide powder produced by the volatilization of ironmaking blast furnace dust through volatilization kiln is used as raw material, and the ingredients (the materials in the present invention are all mass percentages unless otherwise specified): Zn53.3, Fe3.7, Cl 9.2, F0.5 , Pb7.6;

[0052] Ammonium chloride solution system is used to prepare the pre-leaching solution so that its composition reaches NH 4 + 90g / l, NH 3 45g / l;

[0053] Leaching: add 28m to the leaching tank 3 For the solution before leaching, correspondingly add 4.7 tons of zinc oxide powder, the leaching temperature is 35°C, the leaching time is 0.5 hours, the zinc leaching rate is 93.1%, and the filtrate after leaching (i.e. leachate, g / l): Zn82.7, Pb0.53, Cu0.004;

[0054] Purification: zinc powder is added according to twice the total theoretical calculation amount of lead, copper, cadmium and cobalt in the leaching solution (3g / l-leach solution, that is, 1l leaching solution is added with...

Embodiment 2

[0058] Zinc oxide powder produced by volatilization of lead smelting fuming furnace is used as raw material, composition (%): Zn61.6, Fe4.7, Cl 0.71, Cu0.035, Pb10.3.

[0059] Prepare the pre-leaching solution so that its composition reaches NH 4 + 110g / l, NH 3 50g / l;

[0060] Leaching: add 28m to the leaching tank 3 For the pre-leaching solution, correspondingly add 4 tons of zinc oxide powder, the leaching temperature is 40°C, and the leaching time is 2 hours. The zinc leaching rate is 92.1%, and the filtrate composition after leaching (g / l): Zn81.1, Pb0.0053, Cu0.0032, Cd0.0062;

[0061] Purification: add zinc powder (0.2g / l-leach solution) based on 18 times the total theoretical amount of lead, copper, cadmium and cobalt in the leaching solution, the purification time is 1.5 hours, the purification temperature is 35°C, and the impurity composition of the purification solution (mg / l) : Pb0.051, Cu0.03, Cd0.02, Co0.23;

[0062] Electrowinning: Graphite is used as the a...

Embodiment 3

[0065] Zinc dross produced by zinc smelting industrial frequency furnace is used as raw material, composition (%): Zn73.3, Fe2.1, Cl 4.2, Cu0.8, Pb3.7;

[0066] Prepare the pre-leaching solution so that its composition reaches NH 4 + 95g / l, NH 3 45g / l;

[0067] Leaching: add 28m to the leaching tank 3 For the pre-leaching solution, correspondingly add 4 tons of zinc scum, the leaching temperature is 30°C, and the leaching time is 4 hours. The zinc leaching rate is 95.1%, and the filtrate composition after leaching (g / l): Zn99.5, Pb0.005, Cu0.001, Cd0.001;

[0068] Purification: add zinc powder according to 25 times the total theoretical calculation amount of lead, copper, cadmium and cobalt in the leaching solution, the purification time is 0.5 hours, the purification temperature is 30 ℃, the impurity composition of the purification solution (mg / l): Pb0.03, Cu0.01, Cd0.02, Co0.08;

[0069] Electrowinning: Graphite is used as the anode, the same pole distance is 75mm, and...

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Abstract

The invention discloses a method for extracting electrodeposited zinc from a zinc oxide powder in an ammonium chloride solution system. The method comprises the following steps: A, dissolving an ammonium chloride solid in water, at the same time, introducing NH3 and continuously stirring, and allowing the concentration of NH3 of the prepared before-leaching solution to reach 20-70 g / L; B, taking a certain amount of the prepared before-leaching solution, adding the zinc oxide powder according to the liquid-to-solid ratio of 2-10:1, at the same time, introducing NH3 and continuously stirring, and carrying out leaching treatment; C, adding a zinc powder into a filtered liquid after leaching, and carrying out purification treatment to obtain a solution after purification; and D, carrying out electrodeposition treatment of the solution after purification by connecting direct current, wherein an anode adopts graphite and a cathode adopts an aluminum plate. The method is short in flow and has no need of pretreatment of fluorine and chlorine in zinc oxide, the craft process also has no need of a specialized fluorine chlorine removing procedure, process waste water is not produced, and no waste residue is required to be piled up. Therefore, the environmental protection problem is solved, and a development mode of circular economy is also met.

Description

technical field [0001] The invention relates to the technical field of electrolytic zinc extraction, in particular to a method for extracting electrolytic zinc from zinc oxide powder in an ammonium chloride solution system. Background technique [0002] In the prior art, steel plant blast furnace dust and electric arc furnace dust are a kind of solid waste, which contain various valuable metal elements such as zinc, lead, copper, etc., and have great comprehensive utilization value. For example, 40~50% coke powder is added to the zinc-containing fume in the iron and steel plant, and then zinc, lead and other metals can be volatilized at high temperature in the rotary kiln to obtain zinc oxide powder in the volatilization kiln. [0003] The zinc oxide powder produced by the leaching slag of the wet zinc smelting plant after being processed in a volatilization kiln and the zinc oxide-containing smoke dust of the lead smelting plant need to remove fluorine and chlorine first, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C22B3/14
CPCY02P10/20
Inventor 戴兴征
Owner 戴兴征
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