Method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust

A selective, electric furnace technology, applied to the improvement of process efficiency, etc., can solve the problems of complex leachate purification process, inability to extract zinc ferrite, and trouble metallurgists, etc., to simplify purification and separation complex treatment process, easy to centrifuge Separate, increase the effect of production pathways

Active Publication Date: 2016-04-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although traditional alkaline leaching or ammonia leaching has good selectivity to the extraction of zinc, these two methods cannot extract zinc in zinc ferrite, resulting in very low extraction efficiency of zinc ((1) H.X.Li, Y.Wang , D.Q.Cang.J.Cent.SouthUniv.Technol., 17(2010) 967-971. (2) S.Amer, J.M.Figueiredo, A.Luis.Hydrometallurgy, 37(1995) 323-337.)
Although the acid leaching method can efficiently (generally >85%) leach zinc from zinc-containing electric furnace dust, its selectivity is poor, and

Method used

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  • Method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust
  • Method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust
  • Method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Mix zinc-containing electric furnace dust and water according to the solid-to-liquid ratio of 1:10 (g·mL -1 ) were mixed, stirred at room temperature for 12 hours, and then solid-liquid separation was carried out to obtain water-washed zinc-containing electric furnace dust. The zinc-containing electric furnace dust washed with water was dried in an oven at 100° C. for 20 hours.

[0024] (2) The zinc-containing electric furnace dust after washing and drying in the step (1) with ammonium ferric sulfate dodecahydrate is according to mass ratio 7:3 (g·g -1 ) were uniformly mixed, put into a reaction kettle, and reacted hydrothermally at 220° C. for 10 h. After cooling to room temperature, add 80mL of water for solid-liquid separation to obtain zinc-containing leaching solution and iron-containing leaching slag.

Embodiment 2

[0026] (1) Mix zinc-containing electric furnace dust and water according to the solid-to-liquid ratio of 1:10 (g·mL -1 ) were mixed, stirred at room temperature for 10 h, and then separated into solid and liquid. The zinc-containing electric furnace dust washed with water was obtained, and then the zinc-containing electric furnace dust was dried in an oven at 105° C. for 20 hours.

[0027] (2) Washing zinc-containing electric furnace dust after drying in step (1) with ammonium ferric sulfate dodecahydrate according to the mass ratio of 7:3 (g·g -1 ) were uniformly mixed, put into a reaction kettle, and reacted hydrothermally at 220° C. for 12 hours. After cooling to room temperature, add 80mL of water for solid-liquid separation to obtain zinc-containing leaching solution and iron-containing leaching slag.

Embodiment 3

[0029] (1) Mix zinc-containing electric furnace dust and water according to the liquid-solid ratio of 1:10 (g·mL -1 ) were mixed, stirred at room temperature for 11 h, and then solid-liquid separation was carried out. To obtain water-washed zinc-containing electric furnace dust. The zinc-containing electric furnace dust washed with water was dried in an oven at 100°C for 24 hours.

[0030] (2) The zinc-containing electric furnace dust after washing and drying in the step (1) with ammonium ferric sulfate dodecahydrate is according to mass ratio 7:4 (g·g -1 ) were uniformly mixed, put into a reaction kettle, and reacted hydrothermally at 220° C. for 12 hours. After cooling to room temperature, add 100mL of water for solid-liquid separation to obtain zinc-containing leaching solution and iron-containing leaching residue.

[0031] Specific experimental results

[0032] Under the above experimental conditions, the leaching rate of zinc is high (>93%), while the leaching rate of...

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Abstract

The invention discloses a method for selectively and efficiently extracting zinc and removing iron with zinc-containing electric furnace dust as a raw material and belongs to the field of hydrometallurgy. The raw material is the zinc-containing electric furnace dust, an extracting agent is ammonium ferric sulfate dodecahydrate (NH4Fe(SO4)2.l2H2O), the extracting process includes the steps that the zinc-containing electric furnace dust is washed and dried to be evenly mixed with the ammonium ferric sulfate dodecahydrate according to a certain mass ratio, the mixture is placed in an airtight reaction still to be subjected to a hydrothermal reaction for a certain period of time at a certain temperature, the reaction product is taken out to be placed into a centrifugal device, a proper amount of water is added, solid and liquid are separated after stirring, and a zinc-containing leaching agent and iron-containing leaching residues are obtained. The process is simple, the purposes that zinc is extracted efficiently and iron is removed can be achieved through one step, the leaching rate of zinc is over 93%, the leaching rate of iron is lower than 2%, and most of iron is remained in the leaching residues; and the solid-liquid separation process is easy to conduct. By the adoption of the method, zinc can be extracted selectively and efficiently from the zinc-containing electric furnace dust, operation is easy, and the method is a novel method for selectively and efficiently extracting zinc from the zinc-containing electric furnace dust.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and particularly relates to a method for selectively and efficiently extracting zinc and removing iron from zinc-containing electric furnace dust by adding an extractant in one step by using a hydrothermal method. Background technique [0002] As an important non-ferrous metal, zinc has been widely used in various fields of social life. The production and consumption of zinc in my country ranks first in the world. The increase in zinc production and consumption has prompted the society to pay more attention to the recovery, regeneration and utilization of zinc. However, the recovery, regeneration and utilization of zinc in China are far behind the advanced countries in the world, resulting in the waste of resources, energy and water resources and environmental pollution. Therefore, it is of great significance to improve the recovery, regeneration and utilization level of zinc in our country. [0...

Claims

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Application Information

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IPC IPC(8): C22B19/30C22B19/20C22B7/02
CPCC22B7/006C22B7/02C22B19/20C22B19/30Y02P10/20
Inventor 郭敏王会刚张梅高建明贾楠楠
Owner UNIV OF SCI & TECH BEIJING
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