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Comprehensive recycling and harmless disposal method for zinc hydrometallurgy high leaching residue

A technology of harmless treatment and wet zinc smelting, which is applied in the fields of process efficiency improvement, photographic process, instruments, etc., and can solve problems such as increasing the complexity of solidification process operation

Inactive Publication Date: 2020-04-21
CHIFENG ZHONGSE ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When cement and lime are used to solidify the leaching slag of zinc hydrometallurgy, in order to ensure the mixing effect as much as possible, a certain amount of water needs to be added during the mixing process. At present, the existing technology adopts a method similar to concrete mixing preparation, and the output Paste with high moisture content; therefore, the paste produced by curing treatment must be cured for a long time. During the transfer and maintenance of the paste, measures need to be taken to solve the collection of leachate and avoid damage to the Environmental pollution; this situation increases the operational complexity of the curing process

Method used

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  • Comprehensive recycling and harmless disposal method for zinc hydrometallurgy high leaching residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Process such as figure 1 shown;

[0037] The flotation tailings slurry obtained by flotation and recovery of silver from the high leaching slag of the hydrometallurgy; the flotation tailings slurry is subjected to pressure filtration to obtain the tailings press filter liquid and the tailings press filter residue; the solid content of the tailings press filter residue contains Ag ≤80g / t; the mass percentage of water in the tailings press filter residue is 25%; the tailings press filtrate is used in the extraction and electrowinning steps of hydrometallurgy to recover zinc, and the water-soluble zinc in it is recovered in the form of electrolytic zinc; The raffinate is recycled as water in the step of silver recovery by flotation;

[0038] Add water to the tailings press filter residue and stir to adjust the slurry. Add water to stir and adjust the slurry. Use a slurry mixing tank with a stirring speed of 280r / min. The amount of water is 1.0 times the total mass of the ...

Embodiment 2

[0042] Method is with embodiment 1, and difference is:

[0043] (1) The mass percentage of water in the tailings press filter residue is 24%;

[0044] (2) The stirring speed of adding water to stir and paste is 220r / min. The amount of water is added according to 1.2 times of the total mass of the high leaching slag of wet method zinc smelting, and the stabilizer is added to stir and mix for 10 minutes; 3% of the mass, industrial magnesia powder accounts for 0.2% of the total mass of the zinc-ferrosite slag in the hydro-smelting process, apatite powder accounts for 0.2% of the total mass of the 0.1% of the total mass of alum slag; lime powder contains 85% of CaO by mass percentage, industrial magnesium oxide powder contains 90% of MgO by mass percentage, and apatite powder contains P by mass percentage 2 o 5 20%;

[0045] (3) The mass percentage of water in the secondary press filter residue of the stirring speed 150r / min of the material in the intermediate buffer tank is 2...

Embodiment 3

[0048] Method is with embodiment 1, and difference is:

[0049] (1) The mass percentage of water in the tailings press filter residue is 26%;

[0050] (2) The stirring speed of adding water to stir and mix slurry is 250r / min, the consumption of water is added according to 0.8 times of the total mass of the high leaching slag of wet method zinc smelting, and the stabilizing agent is added and stirred and mixed for 20min; 4% of the mass, industrial magnesia powder accounts for 0.1% of the total mass of zinc-ferrosite slag in hydro-smelting, apatite powder accounts for 0.1% of the total mass of 0.2% of the total mass of alum slag; lime powder contains 70% of CaO by mass percentage, industrial magnesium oxide powder contains 70% of MgO by mass percentage, and apatite powder contains P by mass percentage 2 o 5 12%;

[0051] (3) The mass percentage of water in the secondary press filter residue of the stirring speed 90r / min of the material in the intermediate buffer tank is 26%;...

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Abstract

The invention discloses a comprehensive recycling and harmless disposal method for zinc hydrometallurgy high leaching residue. The method comprises the following steps that firstly, the zinc hydrometallurgy high leaching residue is floated for silver recycling, flotation tailing pulp is obtained, and after pressure filter, tailing pressure filter residue is obtained; secondly, water is added to the tailing pressure filter residue for stirring and slurry mixing, and a stabilizing agent is added for stirring to prepare adjusting slurry; and thirdly, the adjusting slurry is subjected to pressurefilter, secondary pressure filter liquid and secondary pressure filter residue are obtained, and the secondary pressure filter residue serves as stabilizing high leaching residue for landfill treatment. Through the method, silver is recycled firstly, meanwhile, floating achieves the effect of slurrying and washing of water soluble zinc, the high leaching residue subsequent stabilizing treatment pressure is reduced, consumption of a stabilizing reagent can be obviously reduced, the landfill amount of subsequent landfill treatment can be reduced, the subsequent treatment operation is obviously simplified, and the transport amount is smaller than mixed curing / stabilizing treatment operation in a paste mixing form.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and the field of environmental protection technology, and specifically relates to a method for comprehensive recovery and harmless treatment of high leaching slag from hydrometallurgy. Background technique [0002] In the lead-zinc smelting process, the high leaching slag (also called lead-silver slag) produced by zinc roasting ore hot acid leaching is a hazardous waste with leaching toxicity characteristics; from the actual production process, the main heavy metals in the high leaching slag, Entrained zinc (existing in the form of zinc sulfate solution), cadmium (existing in the form of cadmium sulfate) and traces of Pb, As, Cr, Sb, Be, F and Cl, etc.; for the harmless treatment of zinc hydrometallurgy leaching slag , lead-zinc joint enterprises generally adopt pyrotechnics, such as smelting with Kifset furnace and Osmet furnace, but the F, Cl, As, and Sb that were originally opened with the leachi...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B19/30C22B19/20C22B11/00C25C1/16
CPCC22B7/006C22B11/042C22B19/20C22B19/30C25C1/16Y02P10/20
Inventor 李龙张拥华肖殿印陈章伟姚凤霞朱建伟畅永锋李文涛范博强高向飞盛星星耿文彪聂华王文祥蔡永志熊峰刘建华孙志关旭东魏景文张志强王少卫
Owner CHIFENG ZHONGSE ZINC IND CO LTD
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