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Method for comprehensively and efficiently treating zinc leaching residues

A technology of zinc leaching slag and leaching slag, which is applied in the field of comprehensive and efficient treatment of zinc leaching slag, can solve the problems of high cost of harmless treatment, waste of indium and copper resources, and inability to efficiently recycle, so as to save operating procedures and realize reduction Discharge, reduce the effect of process operation cost

Active Publication Date: 2022-01-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to statistics, 0.5-0.7 tons of hazardous waste jarosite slag or 0.4-0.5 tons of hazardous waste goethite slag will be produced for every 1 ton of zinc hydrometallurgy leaching slag processed. Conditions”, the above-mentioned hazardous waste iron slag must be treated innocuously, and the cost of harmless treatment per ton of hazardous waste iron slag is as high as 600-800 yuan
Moreover, since more than 90% of the iron in the hot acid leaching solution exists in the form of ferric iron, the indium and copper in the hot acid leaching solution can hardly be recovered, and all of them enter the above-mentioned hazardous waste iron slag, resulting in the zinc hydrometallurgy process Huge waste of associated indium and copper resources
Therefore, the hot acid leaching process has problems such as large amount of hazardous waste iron slag, high cost of harmless treatment, and associated valuable elements such as silver, indium, and copper cannot be efficiently recovered.

Method used

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  • Method for comprehensively and efficiently treating zinc leaching residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] An integrated method of leaching zinc hydrometallurgy efficient processing of slag, the specific steps are as follows:

[0067](1) The zinc hydrometallurgy leaching residue of an aqueous 10% (content of the main elements (dry basis): 22% zinc, 0.015% indium, 2.8% copper, 12% iron, 1% Pb, 0.04% Ag) It was activated mechanically grinding, to a particle size of 74μm finely ground material;

[0068] (2) Step (1) finely ground material output, fed from a feed pump lignin Stage I pressure within the reaction vessel, and heated by the plate heat exchanger deg.] C to 100 of Mixed acid leachate pressing section and the washing, the reaction temperature by the vapor in the tank is controlled to pass 180 ℃, the pressure was 1.6MPa, the reaction after 180min reaction slurry was allowed to stand in a layered thickener to give Stage I plus pressure leaching underflow and Stage I pressure leach solution (main ingredient: sulfuric acid concentration of 45 / L, an indium ion concentration ...

Embodiment 2

[0075] An integrated method of leaching zinc hydrometallurgy efficient processing of slag, the specific steps are as follows:

[0076] (1) The zinc hydrometallurgy leaching residue of an aqueous 15% (content of the main elements (dry basis): 17% zinc, 0.03% indium, 0.5% copper, 18% iron, 5% Pb, 0.03% Ag) was activated mechanically grinding, to give a particle size of 150μm finely ground material;

[0077] (2) The step (1) the output of finely ground material, lignin is fed by the feed pump Stage I pressure within the reaction vessel, and heated by the plate heat exchanger to 70 deg.] C of Mixed acid leachate pressing section and the washing with the vapor in the tank into the control reaction temperature was 110 deg.] C, the pressure was 0.3MPa, after 90min reaction slurry was allowed to stand in a layered thickener to give Stage I plus pressure leaching underflow and Stage I pressure leach solution (main ingredient: sulfuric acid concentration of 20g / L, an indium ion concentra...

Embodiment 3

[0084] An integrated method of leaching zinc hydrometallurgy efficient processing of slag, the specific steps are as follows:

[0085] (1) A 13% aqueous zinc hydrometallurgy leaching residue (content of the main elements (dry basis): 14% zinc, 0.05% indium, 4.0% copper, 22% iron, 3% of Pb, 0.02% Ag) It was activated mechanically grinding, to give a particle size of 55μm finely ground material;

[0086] (2) The step (1) the output of finely ground material, lignin is fed by the feed pump Stage I pressure within the reaction vessel, and heated by the plate heat exchanger to 90 deg.] C of Pressing the mixed acid segment leachate and the washing water, the temperature of the reaction with vapor in the tank is controlled to 160. fed deg.] C, the pressure was 1.0MPa, the reaction after 150min reaction slurry was allowed to stand in a layered thickener to give Stage I plus pressure leaching underflow and Stage I pressure leach solution (main ingredient: sulfuric acid concentration of 30...

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Abstract

The invention relates to a method for comprehensively and efficiently treating zinc leaching residues, and belongs to the technical field of hydrometallurgy. The method comprises the following steps of 1) grinding of the zinc hydrometallurgy leaching residues; 2) first-stage pressure leaching; 3) second-stage pressure leaching; 4) slurrying washing of the leaching residues; 5) replacement copper precipitation; 6) pre-neutralization; and 7) neutralization indium precipitation. According to the method, efficient leaching of valuable metals such as zinc, indium, copper and silver and efficient synchronous precipitation of iron in the zinc hydrometallurgy leaching residues are achieved at the same time; the recovery rates of zinc, indium, copper and silver reach 98%, 88%, 96% and 99% or above respectively, and low-acid and low-iron leachate beneficial to selective separation of copper and indium is produced; and iron is enriched in lead-silver-iron slag together with lead and silver, iron in the lead-silver-iron slag can be used as a lead pyrometallurgy slagging flux and is finally stably solidified in furnace slag or kiln slag in the lead enrichment process, and the transformation from impurities to lead smelting raw materials is achieved.

Description

Technical field [0001] The present invention belongs to the technical field of hydrometallurgy, specifically, it relates to an integrated and efficient method for processing a zinc leaching residue. Background technique [0002] Zinc is an important strategic metal resources, economic development and national defense construction. Sulfide ore is the main raw zinc extraction, mineralization conditions due to the differential pressure, and some sulfide ore associated with a number of objective indium, copper, lead, silver and other valuable metal resources, and some associated lead, silver, germanium, copper and other valuable metals, efficient recovery of zinc smelting process integrated associated valuable elements described above will result in a significant social and economic benefits. Currently, more than about 85% of world zinc sulfide ore roasting using - leach - Purification - EW wet primary production process, depending on the extraction method and the processing method o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B58/00C22B13/00C22B11/00
CPCC22B7/04C22B7/006C22B7/007C22B15/0091C22B15/0067C22B15/0071C22B11/044C22B13/045C22B58/00Y02P10/20
Inventor 李存兄张兆闫魏昶樊刚李兴彬邓志敢李旻廷
Owner KUNMING UNIV OF SCI & TECH
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