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Combined leaching method for high-iron zinc sulfide concentrate and high-iron zinc calcine leaching slag

A zinc sulfide concentrate and calcined sand leaching technology, which is applied in the field of zinc hydrometallurgy, can solve problems such as high energy consumption, low metal leaching rate, and complicated process flow, so as to improve the leaching rate, simplify the process flow, and reduce production. The effect of energy consumption

Inactive Publication Date: 2013-11-27
KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problems of low leaching rate of zinc, indium and copper valuable metals in the material, complex process flow and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. The chemical composition of raw materials and the weight percentage of each component:

[0012] The chemical composition of high-iron zinc sulfide concentrate taken from a hydro-zinc smelting enterprise is as follows: zinc 35wt%, iron 25wt%, indium 780g / t, copper 0.85wt%;

[0013] The chemical composition of the leaching residue of high-iron zinc calcine from a hydro-zinc smelting enterprise is as follows: zinc 30wt%, iron 40wt%, indium 1120g / t, copper 1.29wt%.

[0014] 2. Hot acid joint leaching:

[0015] (1) Mix the high-iron zinc sulfide concentrate and the high-iron zinc calcine leaching residue at a mass ratio of 0.35:1, and adjust the slurry with 190g / L sulfuric acid solution, and the liquid-solid ratio leaching liquid-solid ratio is 6mL / g;

[0016] (2) Process control: Add 3kg / t sodium lignosulfonate concentrate, temperature 89℃~92℃, reaction time 4 hours under stirring condition. The leaching rate of zinc is 95.1%, the leaching rate of indium is 94.8%, and the leachin...

Embodiment 2

[0018] 1. The chemical composition of raw materials and the weight percentage of each component:

[0019] The chemical composition of the high-iron zinc sulfide concentrate taken from a hydro-zinc smelting enterprise is as follows: zinc 46wt%, iron 16wt%, indium 1200g / t, copper 1.48wt%;

[0020] The chemical composition of the leaching residue of high-iron zinc calcine from a hydro-zinc smelting enterprise is as follows: zinc 15wt%, iron 24wt%, indium 2750g / t, copper 2.97wt%.

[0021] 2. Hot acid joint leaching:

[0022] (1) Mix the high-iron zinc sulfide concentrate and the high-iron zinc calcine leaching residue at a mass ratio of 0.15:1, and adjust the slurry with 180g / L sulfuric acid solution, and the liquid-solid ratio leaching liquid-solid ratio is 7mL / g;

[0023] (2) Process control: add 1kg / t sodium lignosulfonate concentrate, temperature 92℃~95℃, reaction time 2 hours under stirring condition. The leaching rate of zinc is 95.3%, the leaching rate of indium is 95.6%, and the le...

Embodiment 3

[0025] 1. The chemical composition of raw materials and the weight percentage of each component:

[0026] The chemical composition of high-iron zinc sulfide concentrate taken from a hydro-zinc smelting company is as follows: zinc 42wt%, iron 19wt%, indium 300g / t, copper 0.1wt%;

[0027] The chemical composition of the leaching residue of high-iron zinc calcine from a hydro-zinc smelting enterprise is as follows: zinc 25wt%, iron 29wt%, indium 465g / t, copper 0.15wt%.

[0028] 2. Hot acid joint leaching:

[0029] (1) Mix the high-iron zinc sulfide concentrate and the high-iron zinc calcine leaching residue at a mass ratio of 0.25:1, and adjust the slurry with 160g / L sulfuric acid solution, and the liquid-solid ratio leaching liquid-solid ratio is 8mL / g;

[0030] (2) Process control: add 2kg / t of sodium lignosulfonate concentrate, temperature 85℃~88℃, reaction time 3 hours under stirring condition. The leaching rate of zinc is 96.5%, the leaching rate of indium is 94.1%, the leaching rate...

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Abstract

The invention belongs to the technical field of zinc hydrometallurgy, and particularly relates to a combined leaching method for high-iron zinc sulfide concentrate and high-iron zinc calcine leaching slag. The method comprises a step of mixing the high-iron zinc sulfide concentrate and the high-iron zinc calcine leaching slag according to a mass ratio of 0.15:1-0.35:1; a step of adopting a solution containing 160-190 g / L of sulfur acid as a leaching agent; a step of adding 1-3 kg sodium lignosulphonate per ton zinc concentrate allowing that the liquid-solid ratio is 6-8 mL / g; and a step of reacting at 85-95 DEG C for 2-4 h under stirring to leach out valuable metals comprising zinc, indium and copper and to reduce Fe<3+> to Fe<2+>. According to the method, a hot-acid leaching technology of zinc leaching slag and a high-iron leaching solution reduction technology are combined to be completed in a process, thereby improving the leaching rate of the valuable metals, achieving efficient reduction of the Fe<3+>, and contributing to subsequent extraction of the zinc, the copper and the indium. The method is characterized by being short in technology process, clean, efficient, energy-saving, and the like.

Description

technical field [0001] The invention belongs to the field of zinc hydrometallurgy, in particular to a method for combined leaching of high-iron zinc sulfide concentrate and high-iron zinc calcined leaching slag. Background technique [0002] Iron is the impurity with the highest content except sulfur in high-iron zinc sulfide concentrates. Most of the iron associated in zinc concentrates exists in the form of zinc in sphaleride, so the separation of zinc and iron is an important part of zinc smelting. [0003] A large amount of zinc ferrite is inevitably produced during the roasting process of high-iron zinc sulfide concentrate, and the zinc ferrite is not destroyed in the neutral leaching process, and remains in the neutral leaching slag with undissolved zinc oxide. Hot acid leaching is an effective method for destroying zinc ferrite, which can achieve high-efficiency leaching of zinc, but when the leaching rate of zinc is increased to 95%, the leaching rate of iron is also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B19/00C22B58/00C22B15/00
CPCY02P10/20
Inventor 邓志敢魏昶李存兄张帆樊刚李兴彬李旻廷
Owner KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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