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Comprehensive recovery and harmless treatment method for zinc hydrometallurgy iron vitriol slag and high leaching slag

A technology of harmless treatment and hydrometallurgy zinc, which is applied in the improvement of process efficiency, photography technology, instruments, etc., can solve the problem of increasing the stock of harmless slag, pollution, difficult to achieve good mixing of slag, cement and lime, etc. question

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

But adopting cement or lime to carry out solidification treatment of slag, the main difficulty is that it is difficult to realize good mixing of slag, cement and lime, so a larger amount of curing agent must be used; from literature reports, the amount of lime added is more than 10% , 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 using cement and lime to solidify zinc hydrometallurgy slag, in order to ensure the mixing effect as much as possible, it is necessary to add a certain amount of water during the mixing process. At present, the existing technology adopts a method similar to concrete mixing and preparation, and the output Paste with high water 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 recovery and harmless treatment method for zinc hydrometallurgy iron vitriol slag and high leaching slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 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;

[0040] 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%;

[0041] The flotation tai...

Embodiment 2

[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 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%;

[0049] (2) The mass percentage of water in the tailings filter press residue is 24%;

[0050] (3) The mixing ratio of iron-vanadium filter press residue and tailings filter press residue is based on the mass ratio of iron-vanadium filter press residue: tailings filter press = 0.45; the stirring speed of stirring and slurry adjustment is 200 rpm, and the amount of water is 1.2 times the total mass of the mixed residue. ; Add stabilizer and stir and mix for 10 minutes; lime powder accounts for 2% of the total mass of hydrometallurgical slag, industrial magnesium oxide powder accounts for 0.1% of the total mass of hydrometallic slag, and apatite powder accounts for ...

Embodiment 3

[0054] (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%;

[0055] (2) The mass percentage of water in the tailings filter press residue is 26%;

[0056] (3) The mixing ratio of iron-vanadium filter press residue and tailings filter press residue is based on mass ratio. Iron-vanadium filter press residue: tailings filter press = 0.55; the stirring speed of stirring and slurry adjustment is 300 rpm, and the amount of water is 0.8 times the total mass of the mixed residue. ; Add stabilizer and stir and mix for 20 minutes; lime powder accounts for 4% of the total mass of hydrometallurgical slag, industrial magnesium oxide powder accounts for 0.2% of the total mass of hydrometallurgical slag, and apatite powder accounts for 0.1% of the total mass of zinc-iron vitriol slag, heavy metal adsor...

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Abstract

The invention discloses a comprehensive recovery and harmless treatment method for zinc hydrometallurgy iron vitriol slag and high leaching slag. The method comprises the following steps of (1) addingwater into the zinc hydrometallurgy iron vitriol slag for slurrying and washing, and performing filter pressing on the obtained iron vitriol slag slurry to obtain iron vitriol slag filter-pressing slag; (2) performing flotation on the zinc hydrometallurgy high leaching slag to recover silver, and performing filter pressing on the obtained flotation tailings to obtain tailing filter-pressing slag;(3) mixing the iron vitriol filter-pressing slag and the tailing filter-pressing slag to prepare mixed slag, adding water, stirring and mixing slurry, and adding a stabilizer and stirring to prepareadjusting slurry; and (4) performing filter pressing on the adjusting slurry, and performing landfill treatment on the obtained secondary filter-pressing slag serving as stabilized mixed slag. According to the method disclosed by the invention, the recycling of the valuable element zinc is realized; the pressure of subsequent stabilization treatment of the iron vitriol slag is reduced, the consumption of a stabilizing reagent is obviously reduced, the subsequent treatment operation is simplified, and the transportation amount is smaller than that of mixed curing / stabilization treatment operation in a paste stirring form.

Description

Technical field [0001] The invention belongs to the technical field of hydrometallurgy and environmental protection, and specifically relates to a method for comprehensive recovery and harmless treatment of hydrometallurgy slag and high-leaching slag. Background technique [0002] In the process of lead-zinc smelting, the high-leaching residue produced by hot acid leaching of zinc roasting ore (also called lead-silver slag) is a hazardous waste with characteristics of leaching toxicity, and the hot acid leaching jarosite produced by zinc roasting ore The slag is a hazardous waste with leaching toxicity characteristics; from the actual production process, the main heavy metals in the high-leaching slag and iron vitriol slag are entrained zinc (in the form of zinc sulfate solution), cadmium (in the form of cadmium sulfate) and Trace amounts of Pb, As, Cr, Sb, Be, F, Cl, etc.; for the harmless treatment of hydrometallurgical zinc smelting slag, lead-zinc joint enterprises generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/20C22B19/30C25C1/16C22B11/00C22B13/00
CPCC22B7/006C22B11/042C22B13/045C22B19/20C22B19/30C25C1/16Y02P10/20
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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