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Harmless treatment method for recovering zinc and recovering slag through zinc hydro-metallurgy ammonium jarosite washing

A technology for harmless treatment and hydrometallurgy zinc, which is applied in the field of hydrometallurgy and can solve the problems of increasing the stockpile of harmless slag, pollution, and difficulty in realizing good mixing of jarosite slag, cement and lime, etc.

Inactive Publication Date: 2020-04-28
CHIFENG ZHONGSE ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopting cement or lime to carry out the solidification treatment of the alumina slag, the main difficulty is that it is difficult to realize the good mixing of the alumina slag, cement and lime, so a larger amount of solidifying agent must be used; from the reported situation in the literature, the amount of lime added is more than 10%, and the amount of cement added is as high as 40%. This treatment method significantly increases the subsequent storage of harmless chemical slag in the slag yard
[0005] When cement and lime are used to solidify the alumina slag, 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 moisture content is high. 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 pollution to the environment.
This situation increases the operational complexity of the curing process

Method used

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  • Harmless treatment method for recovering zinc and recovering slag through zinc hydro-metallurgy ammonium jarosite washing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The process is like figure 1 As shown; the slurry washing adopts a slurry washing tank, and then is transported to the filter press; the slurry mixing tank is used for water stirring and slurry adjustment; the adjusted slurry is first placed in an intermediate buffer tank with stirring, under stirring conditions Avoid solids settling, and then transport to the filter press;

[0035] Add water to the hydro-zinc iron vitriol slag for slurry washing. The amount of water added is 1.0 times the mass of the hydro-zinc iron vitriol slag. The stirring speed during slurry washing is 280 rpm and the slurry washing time is 15 minutes. Slag slurry liquid; press filter the vitriol slag slurry liquid to obtain the vitriol slag press filtrate and vitriol slag filter press; the mass percentage of water-soluble Zn in the solid content of the vitriol slag filter press residue is ≤1%, the vitriol slag The mass percentage of water in the filter press residue is 23%;

[0036] The iron vitriol ...

Embodiment 2

[0041] The method is the same as in Example 1, the difference is:

[0042] (1) The amount of water used in the slurry washing is 0.8 times the mass of the hydrometallurgical vitriol slag, the stirring speed is 220 rpm, and the time is 20 minutes; the mass percentage of water in the vitriol slag press filter residue is 22%;

[0043] (2) The amount of water used in the mixing and slurry adjustment should be 1.2 times the mass of the hydrometallurgical slag. The stirring speed is 220 rpm, and then the stabilizer should be added and mixed for 10 minutes. 5% of the total mass of the slag, industrial magnesium oxide powder accounts for 1% of the total mass of the hydrometallurgical slag, apatite powder accounts for 0.5% of the total mass of the hydrometallurgical slag, and heavy metal adsorbents 1% of the total mass of zinc-iron vitriol slag; lime powder contains 85% CaO by mass percentage, industrial magnesium oxide powder contains 90% MgO by mass percentage, and apatite powder contains...

Embodiment 3

[0047] The method is the same as in Example 1, the difference is:

[0048] (1) The amount of water used in the slurry washing is 1.2 times the mass of the hydrometallurgical vitriol slag, the stirring speed is 250 rpm, and the time is 10 minutes; the mass percentage of water in the vitriol slag press filter residue is 24%;

[0049] (2) The amount of water used in the mixing and slurry adjustment should be 0.8 times the mass of the hydrometallurgical slag, the stirring speed is 250rpm, and then the stabilizer is added for stirring for 20min, and the amount of stabilizer is based on the lime powder accounted for in the hydrometallurgical zinc 7% of the total mass of the slag, industrial magnesium oxide powder accounts for 0.5% of the total mass of the hydrometallurgical slag, apatite powder accounts for 1% of the total mass of the hydrometallic slag, and heavy metal adsorbents account for 0.5% of the total mass of zinc-iron vitriol slag; lime powder contains 70% CaO by mass percentag...

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Abstract

The invention relates to a harmless treatment method for recovering zinc and recovering slag through zinc hydro-metallurgy ammonium jarosite washing. The method comprises the following steps of (1) adding water to zinc hydro-metallurgy ammonium jarosite, carrying out slurry washing, and carrying out filter-pressing on the obtained ammonium jarosite slurry to obtain ammonium jarosite filter-pressing slag; (2) adding water into the ammonium jarosite filter-pressing slag, stirring and mixing, adding a stabilizer, and uniformly stirring and mixing to prepare a regulating slurry; (3) carrying out filter-pressing on the regulating slurry to obtain secondary filter-pressing slag as stabilized ammonium jarosite, and carrying out landfill treatment; and recycling the secondary press filtrate. According to the method, water-soluble zinc is recovered through slurry washing, recycling of valuable elements is achieved, the pressure of subsequent stabilization treatment of the ammonium jarosite is reduced, consumption of stabilization reagent is remarkably reduced, the landfill amount of subsequent landfill treatment is also reduced, and subsequent treatment operation is remarkably simplified.

Description

Technical field [0001] The invention belongs to the field of hydrometallurgy and the technical field of environmental protection, and specifically relates to a method for washing and recovering zinc from hydrometallurgical zinc slag and the harmless treatment of the recovered slag. Background technique [0002] In the process of lead-zinc smelting, the alum slag produced by the hot acid leaching of jarosite from zinc roasting ore is a hazardous waste with leaching toxicity characteristics. From the actual production process, the main heavy metal in the alum slag is the entrained zinc. (Exist in the form of zinc sulfate solution) and a small amount of Zn co-precipitated during the precipitation process of vitriol, as well as trace amounts of Cd, Pb, As, Cr, Sb, Be, F, and Cl, etc.; harmless treatment of vitriol slag , Lead-zinc joint enterprises generally use pyrotechnical processes, such as the use of Kiefset furnaces and Osmet furnaces for smelting, but the F, Cl, As, and Sb tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C22B7/04C22B19/30
CPCB09B3/00B09B5/00C22B7/04C22B19/30Y02P10/20
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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