Method for recycling zinc and iron in zinc oxygen pressure leaching slag

A technology for leaching slag and zinc oxide, which is applied in the direction of improving process efficiency, can solve the problems of no fixed process route, complex impurity content and types, and large differences in the properties of zinc-oxygen pressure leaching slag, achieving huge environmental benefits and economic benefits Benefits, low cost, and no pollution to the environment

Active Publication Date: 2018-12-18
有研资源环境技术研究院(北京)有限公司 +2
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AI Technical Summary

Problems solved by technology

Due to the large differences in the properties of zinc oxygen pressure leaching slag, and the complex content and types of impurities, there is no fixed process route for its treatment

Method used

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  • Method for recycling zinc and iron in zinc oxygen pressure leaching slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] process such as figure 1 As shown, 100g of a zinc oxygen pressure leaching residue (Zn 5.78%, Fe 20.01%) was ground to a particle size of -200 mesh to -400 mesh, mixed with 60g of concentrated sulfuric acid (content 98%), and 10g of magnesium hydrogen sulfate. Mix evenly, put it into a muffle furnace for roasting, control the roasting temperature to 250° C., and roast for 2 hours. After the calcination, the calcined sand obtained was added to the sulfuric acid solution (concentration ~ 1wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 50° C. for 1 h, and then filtered to obtain the zinc-containing iron filtrate I and Leach residue. Add reduced iron powder to the zinc-containing iron filtrate I, the added amount is 1.1 times of the theoretical amount, the reduction time is 0.5h, and then filter to obtain the zinc-containing iron filtrate II and iron powder reduction slag. Carry out the extraction of zinc to zinc-containing iron filtrate II, extractant is P204...

Embodiment 2

[0034] process such as figure 1 As shown, 100g of a zinc oxygen pressure leaching residue (Zn 5.78%, Fe 20.01%) was ground to a particle size of -200 mesh to -400 mesh, mixed with concentrated sulfuric acid (content 98%) 80g, potassium hydrogensulfate 30g and Mix evenly, put it into a muffle furnace for roasting, control the roasting temperature to 300° C., and roast for 3 hours. After the roasting, the calcined sand obtained was added to the sulfuric acid solution (concentration ~ 2wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 70° C. for 1 h, and then filtered to obtain the zinc-containing iron filtrate I and Leach residue. Add reduced iron powder to the zinc-containing iron filtrate I, the addition amount is 1.1 times of the theoretical amount, and the reduction time is 1 hour, and then filter to obtain the zinc-containing iron filtrate II and iron powder reduction slag. The zinc-containing iron filtrate II is carried out to the extraction of zinc, the extract...

Embodiment 3

[0037] process such as figure 1 As shown, 100g of a zinc oxygen pressure leaching residue (Zn 5.78%, Fe 20.01%) was ground to a particle size of -200 mesh to -400 mesh, mixed with concentrated sulfuric acid (content 98%) 90g, ammonium bisulfate 40g and Mix evenly, put it into a muffle furnace for roasting, control the roasting temperature to 300° C., and the roasting time to be 3.5 hours. After the roasting, the calcined sand obtained was added to the sulfuric acid solution (concentration ~ 4wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 80° C. for 1 h, and then filtered to obtain the zinc-containing iron filtrate I and Leach residue. Add reduced iron powder to the zinc-containing iron filtrate I, the addition amount is 1.2 times of the theoretical amount, and the reduction time is 1 h, and then filter to obtain the zinc-containing iron filtrate II and iron powder reduction slag. The zinc-containing iron filtrate II is carried out to the extraction of zinc, the e...

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PUM

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Abstract

The invention provides a method for recycling zinc and iron in zinc oxygen pressure leaching slag. The method comprises the following steps that ingredient preparation is conducted according to mass ratio of zinc oxygen pressure leaching slag: concentrated sulfuric acid: bisulfate being 1: 0.4-2: 0.1-2; the ingredients are uniformly mixed, and roasting is conducted at 200-40 DEG C and lasts for 0.5-5 hours to obtain a roasted product; the roasted product is subjected to sulfuric acid solution leaching at 20-95 DEG C, concentration of the sulfuric acid solution is less than 5 wt%, and the leaching time is 0.5-4 hours; filtering is conducted, zinc and iron are placed into filter liquor I containing zinc and iron, iron powder is added into the filter liquor I containing zinc and iron, the Fe<3+> is restored to Fe<2+>, and filtering is conducted to obtain filter liquor II containing zinc and iron; and the filter liquor II containing zinc and iron is subjected to zinc extraction, and therefore zinc can be recycled. The rest liquor containing iron is subjected to evaporation, refrigeration and crystallization, and therefore byproduct ferrous sulfate heptahydrate crystal can be obtained.The zinc and iron in zinc oxygen pressure leaching slag can be efficiently extracted. The recycling rate of the zinc is greater than 96%, and the recycling rate of the iron is greater than 95%. The method has the advantages that recycling rate is high, operation is convenient, and energy consumption is low.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and relates to a method for recovering valuable metals, in particular to a method for recovering zinc and iron in zinc oxygen pressure leaching slag. Background technique [0002] A large amount of zinc oxygen pressure leaching slag will be produced in the zinc oxygen pressure leaching process of zinc concentrate, and these slags still contain a certain amount of valuable metals, such as Zn content is 4-10%; Fe content is 15-30%. Apart from stockpiling, there is currently no suitable way to deal with it. As the country's requirements for environmental protection are getting higher and higher, the high-value utilization of zinc oxygen pressure leaching residue has become an important topic in the field of environmental protection and secondary resource utilization. It has high economic value and potential social benefits. . [0003] Generally speaking, the recovery methods of zinc and ir...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B7/00C22B19/20C22B19/30
CPCC22B1/06C22B7/007C22B19/22C22B19/30Y02P10/20
Inventor 温建康高文成孙成余黄云东马雁鸿赵义武陶延山武彪刘学孟庆宇刘黎波付天磊尚鹤莫晓兰崔兴兰陈勃伟
Owner 有研资源环境技术研究院(北京)有限公司
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