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A method for efficiently recovering zinc from zinc leaching residues

A zinc leaching residue and high-efficiency technology, applied in the field of hydrometallurgy zinc, can solve problems such as low zinc leaching rate, and achieve the effects of improving separation performance, improving recovery rate and reducing production cost

Inactive Publication Date: 2018-12-04
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for efficiently reclaiming zinc from zinc leaching slag, so as to solve the problem of low zinc leaching rate existing in the existing sulfuration roasting-water leaching process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Mix the zinc leaching slag and sulfuric acid evenly at a roasting temperature of 200°C, the amount of sulfuric acid is 60% of the mass of the zinc leaching slag, and roast in an atmosphere furnace with a preset temperature of 200°C under normal pressure 3h;

[0027] Step 2, after the roasting is completed, take out the calcined sand, cool and grind;

[0028] Step 3, at normal temperature and pressure, put the ground calcined sand into a container filled with tap water, then place the container in a parallel magnetic field with a magnetic induction intensity of 3T, stir and leaching at a stirring speed of 200r / min, and stir The direction should make the positive ions generate upward Lorentz force, the volume-to-mass ratio of liquid to solid during water leaching is 3:1; the leaching time is 1h;

[0029] Step 4: After the leaching is completed, solid-liquid separation is carried out.

[0030] At this time, the zinc leaching rate was 85.3%.

Embodiment 2

[0032] Step 1: Mix the zinc leaching slag and sulfuric acid evenly at a roasting temperature of 300°C, the amount of sulfuric acid is 80% of the mass of the zinc leaching slag, and roast in an atmosphere furnace with a preset temperature of 300°C under normal pressure 2.5 hours;

[0033] Step 2, after the roasting is completed, take out the calcined sand, cool and grind;

[0034] Step 3, at normal temperature and pressure, put the ground calcined sand into a container filled with tap water, then place the container in a parallel magnetic field with a magnetic induction intensity of 3T, stir and leaching at a stirring speed of 500r / min, and stir The direction should make the positive ions produce upward Lorentz force, the volume-to-mass ratio of liquid to solid during water leaching is 6:1; the leaching time is 1h;

[0035] Step 4: After the leaching is completed, solid-liquid separation is carried out.

[0036] At this time, the zinc leaching rate was 92.3%.

Embodiment 3

[0038] Step 1: Mix the zinc leaching slag and sulfuric acid evenly at a roasting temperature of 250°C, the amount of sulfuric acid is 70% of the mass of the zinc leaching slag, and roast in an atmosphere furnace with a preset temperature of 250°C under normal pressure 2.5 hours;

[0039] Step 2, after the roasting is completed, take out the calcined sand, cool and grind;

[0040] Step 3, at normal temperature and pressure, put the ground calcined sand into a container filled with tap water, then place the container in a parallel magnetic field with a magnetic induction intensity of 2T, stir and leaching at a stirring speed of 500r / min, and stir The direction should make the positive ions generate upward Lorentz force, the volume-to-mass ratio of liquid to solid during water leaching is 4:1; the leaching time is 1h;

[0041] Step 4: After the leaching is completed, solid-liquid separation is carried out.

[0042] At this time, the zinc leaching rate was 98.2%.

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PUM

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Abstract

The invention discloses a method for efficiently recovering zinc from zinc leaching residues, belonging to the field of zinc hydrometallurgy, and overcoming a problem that present sulfurization roasting-water leaching processes have low zinc leaching rates. According to a technical scheme, the method includes fully mixing zinc leaching residues and sulfuric acid; then roasting the mixture in an atmosphere furnace under atmospheric pressure; after roasting is completed, taking a roasted product out and cooling and grinding the roasted product; adding the ground roasted product into a containercontaining tap water at room temperature under atmospheric pressure; then putting the container into a parallel magnetic field with the magnetic induction intensity being 0.5-3 T; stirring the mixturefor leaching, with the stirring direction being a direction that allows positive ions to generate upward Lorentz force; and after leaching is completed, performing solid liquid separation. Beneficialeffects are that: the magnetic field changes the structure of water molecules and reduces the viscosity of a solution, a trivalent ion hydrolysate in the roasted product is dissolved to release covered zinc, and the magnetic field increases the zinc leaching rate and shortens the zinc leaching time.

Description

technical field [0001] The invention belongs to the field of zinc hydrometallurgy, in particular to a method for efficiently recovering zinc from zinc leaching slag. Background technique [0002] The production of zinc generally adopts the traditional hydrometallurgical process, that is, zinc sulfide ore and zinc oxide ore are used as raw materials, and zinc is recovered by roasting-leaching-purification-electrowinning process. In the process of zinc hydrometallurgy, a large amount of zinc leaching slag is produced every year. At present, except a small amount of waste residue is sent to make cement or bricks, most of the waste residue is stored. The waste residue contains 8%-20% zinc, 6%-25% lead, and about 300g / t silver, as well as toxic elements such as germanium, arsenic, antimony, and cadmium. more attention. [0003] Most of the zinc in the zinc leaching slag is ZnFe 2 o 4 The form exists, and a small amount exists in the form of ZnS. Using the sulfation roasting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/06C22B19/30
CPCC22B1/06C22B7/006C22B19/30Y02P10/20
Inventor 姚夏妍余江鸿鲁兴武李彦龙程亮李俞良李守荣张恩玉李贵
Owner NORTHWEST RES INST OF MINING & METALLURGY INST