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A method for efficiently recovering zinc and iron from materials containing zinc ferrite

A technology of material and acid zinc, which is applied in the field of recycling valuable metals and efficiently recovering zinc and iron, can solve the problems of incomplete volatilization, high energy consumption, and low zinc leaching rate, and achieve improved utilization, simple process flow, and low cost. low effect

Active Publication Date: 2021-11-19
有研资源环境技术研究院(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The aforementioned methods have their own advantages and disadvantages. For example, when using high-temperature and high-acid leaching of materials containing zinc ferrite, the leaching rate of zinc is relatively low, mostly between 90% and 95%. Problems such as incomplete volatilization

Method used

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  • A method for efficiently recovering zinc and iron from materials containing zinc ferrite
  • A method for efficiently recovering zinc and iron from materials containing zinc ferrite

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Table 1 Phase analysis of a certain zinc ferrite material

[0032]

[0033] process such as figure 1 As shown, 100g of a zinc ferrite-containing material (Zn 15.16%, Fe 30.01%, see Table 1 for phase analysis) was ground to a particle size of -200 mesh to -400 mesh, and concentrated sulfuric acid (content 98%) 50g, Sodium sulfate 10g is batched and mixed evenly, put into a muffle furnace for roasting, the roasting temperature is controlled at 200°C, and the roasting time is 2h. After roasting, place the obtained calcined sand in water for stirring and leaching, the stirring speed is 200-300rpm, the solid-to-liquid ratio (g / mL) is 1:5, and after stirring for 1 hour at 50°C, filter to obtain a zinc-iron solution and leach residue. The zinc-containing iron solution uses hydrogen peroxide as the oxidant and sodium carbonate as the pH regulator to remove iron from goethite at 40°C; after iron removal, goethite slag and zinc-containing solution are obtained; the zinc-cont...

Embodiment 2

[0036] process such as figure 1 As shown, 100g of a zinc ferrite-containing material (Zn 15.16%, Fe 30.01%, see Table 1 for phase analysis) was ground to a particle size of -200 mesh to -400 mesh, and concentrated sulfuric acid (content 98%) 40g, Potassium sulfate 15g is batched and mixed evenly, put into a muffle furnace for roasting, the roasting temperature is controlled at 250°C, and the roasting time is 2h. After roasting, place the obtained calcined sand in water for stirring and leaching, the stirring speed is 200-300rpm, the solid-to-liquid ratio (g / mL) is 1:5, and after stirring for 1 hour at 40°C, filter to obtain a zinc-iron solution and leach residue. The zinc-containing iron solution uses hydrogen peroxide as the oxidant and potassium carbonate as the pH regulator to remove iron from goethite at 50°C; after iron removal, goethite slag and zinc-containing solution are obtained; the zinc-containing solution is extracted and recovered for zinc, and extracted The ag...

Embodiment 3

[0039] process such asfigure 1 As shown, 100g of a zinc ferrite-containing material (Zn 15.16%, Fe 30.01%, see Table 1 for phase analysis) was ground to a particle size of -200 mesh to -400 mesh, and concentrated sulfuric acid (content 98%) 40g, 20g of ammonium sulfate was prepared and mixed evenly, and put into a muffle furnace for roasting, the roasting temperature was controlled at 300°C, and the roasting time was 2h. After roasting, place the obtained calcined sand in water for stirring and leaching, the stirring speed is 200-300rpm, the solid-to-liquid ratio (g / mL) is 1:5, and after stirring for 1 hour at 40°C, filter to obtain a zinc-iron solution and leach residue. The zinc-containing iron solution uses hydrogen peroxide as the oxidant and ammonium carbonate as the pH adjuster to remove iron from goethite at 70°C; after iron removal, goethite slag and zinc-containing solution are obtained; the zinc-containing solution is extracted and recovered for zinc, and extracted ...

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Abstract

The invention provides a method for efficiently recovering zinc and iron from zinc ferrite-containing materials, which comprises the following steps: grinding the zinc ferrite-containing materials, and according to the zinc ferrite-containing materials: sulfuric acid: sulfate = 1: 0.1~ 1: 0.01-1 mass ratio batching; mix the ingredients evenly, and roast at 150-400°C for 0.5-4h; stir and leach the roasted material at 25-90°C for 0.5-4h, filter, A zinc-iron solution and a filter residue are obtained; the zinc-iron solution is deironed by a goethite method to obtain goethite slag. The zinc-containing solution after iron removal can be extracted and electrowinning to obtain electro-zinc products, and the raffinate is circulated into stirring and leaching. After repeated cycles, the circuit is opened for evaporative cooling and crystallization to obtain sulfate crystals, which are returned to the batching section. The invention can realize high-efficiency decomposition, leaching and recovery of materials containing zinc ferrite, the recovery rate of zinc is more than 98%, and the recovery rate of iron is more than 95%, and has the advantages of high recovery rate, low energy consumption, recyclable solution and the like.

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 efficiently recovering zinc and iron from materials containing zinc ferrite. Background technique [0002] Iron and steel smelting enterprises will produce a large amount of materials containing zinc ferrite every year, such as bag ash, fine ash, secondary ash, dust removal ash, etc., of which the zinc content is about 5-15%. In addition to zinc ferrite, these zinc ferrite-containing materials also contain a certain amount of iron, with a content of about 10-30%, which has a certain recycling value. It is worth noting that if these materials containing zinc ferrite are directly returned to steelmaking and ironmaking without treatment, it will cause irreversible loss to the furnace body and product quality. For these materials containing zinc ferrite, zinc and iron can be leached by conventional high-tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/06C22B3/04C22B19/20C22B3/38C21B15/00
CPCC21B15/00C22B1/06C22B3/04C22B19/20C22B3/3846Y02P10/20
Inventor 高文成温建康武彪尚鹤刘学
Owner 有研资源环境技术研究院(北京)有限公司
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