Wet metallurgy process of high-silicon zinc concentrate

A technology of hydrometallurgy and zinc concentrate, which is applied in the direction of photography process, photography auxiliary process, and process efficiency improvement, etc., can solve the problem of silica gel affecting liquid-solid separation, and achieves the solution of liquid-solid separation problem, the process is simple, and the process is feasible. Actionable effect

Inactive Publication Date: 2019-10-22
新疆紫金有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

After the high-silicon zinc concentrate is roasted, the conventional leaching process has the problem that silica leaching forms silica gel and affects liquid-solid separation.

Method used

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  • Wet metallurgy process of high-silicon zinc concentrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. The main components of high silicon zinc concentrate are shown in the table below

[0042] element Zn SiO 2

S Fe Pb Cd Cu content / % 56.82 8.08 28.06 1.40 0.68 0.24 0.057

[0043] Two, the main process

[0044] Fluidized roasting of high-silicon zinc concentrate, neutral leaching of calcined sand with oxidizing solution of conventional wet zinc smelting process, thick neutral leaching pulp, overflow sent to purify and recover zinc; middle leaching underflow is carried out with waste electrolyte Medium and high acid leaching, after leaching, the ore pulp is flocculated densely with flocculant.

[0045] 3. Main process conditions and results

[0046] 1. Zinc concentrate particle size: -250 mesh sieve ≥ 82wt%.

[0047] 2. Fluidized roasting of high-silicon-zinc concentrate, the roasting temperature is 900°C, the excess air coefficient is 1.3, and the furnace bottom pressure is 12kPa. The yield of calcined sand is 84.60%, the...

Embodiment 2

[0051] Take high-silicon-zinc concentrate containing 51% zinc, 27.5% sulfur, and 12.3% silicon dioxide; carry out fluidized roasting on the high-silicon-zinc concentrate, the roasting temperature is 880°C, and the roasting desulfurization rate is 98.5%; The oxidizing solution in the zinc smelting process of the method is used for neutral leaching of calcined sand. The oxidizing solution for intermediate leaching is composed of spent electrolyte, mixed solution, anode mud slurry and manganese ore slurry. The intermediate leaching temperature is 80°C, and the leaching liquid-solid ratio is 10:1. The leaching time is 3 hours, the pH value of the leaching end point is 5.2, the neutral leaching pulp is dense, and the overflow is sent to purify to recover zinc; the middle and high acid leaching is carried out with the waste electrolyte in the middle leaching bottom flow, and the temperature is controlled at 70°C. The ratio of leaching liquid to solid is 5:1. After 3 hours, the pH val...

Embodiment 3

[0053] 1. The main components of high silicon zinc concentrate are shown in the table below

[0054] element Zn S Fe SiO 2

Pb mn CaO MgO content 57.00 30.08 1.58 7.37 0.41 0.026 0.42 0.12 element Al Ni co Cu Cd Ga Ge In content 0.58 0.0012 0.0011 0.049 0.25 ＜0.0005 ＜0.0005 ＜0.0005 element Hg As Sb Cr F Cl Ag(g / t) content 0.001 0.008 0.0020 0.046 0.008 0.01 18.73

[0055] Two, the main process

[0056] Fluidized roasting of high-silicon zinc concentrate, neutral leaching of calcined sand with oxidizing solution of conventional wet zinc smelting process, thick neutral leaching pulp, overflow sent to purify and recover zinc; middle leaching underflow is carried out with waste electrolyte Medium and high acid leaching, after leaching, the ore pulp is flocculated densely with flocculant.

[0057] 3. Main process conditions and results

[0058] 1. Zinc concentrate particl...

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Abstract

The invention discloses a wet metallurgy process of high-silicon zinc concentrate, and belongs to the field of wet metallurgy. Firstly, high-silicon low-impurity non-traditional type zinc concentrateis subjected to fluidized roasting, and high-silicon low-sulfur low-iron zinc calcine is prepared; the high-silicon low-sulfur low-iron zinc calcine is subjected to first-section neutral-second-section medium-high-acid two-section counter current leaching; after neutral leaching ore pulp is diluted with supernatant, a flocculating agent is added for flocculating thickening, after overflow is purified, zinc is recycled, and silicon dioxide is not subjected to gelatinization by controlling process technical conditions; medium leaching underflow is subjected to medium-high-acid leaching with waste electrolyte; and the ore pulp is filter-pressed after medium-high-acid leaching is completed for liquid-solid separation, leaching slag is dried and then fed back to a rotary kiln system, leachate returns, and oxidized liquid is prepared. Formation of silica sol can be avoided with a conventional medium leaching-direct medium-high-acid leaching method adopted for the high-silicon zinc concentrate, and the settling property of the ore pulp is greatly improved. Compared with other high-silicon ore treatment processes, the wet metallurgy process has the beneficial effects of being simple, highin operability, easy to achieve, high in leaching rate and the like.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and relates to a hydrometallurgical process for extracting zinc from high-silicon zinc concentrate. Background technique [0002] With the development of various industries, the scope of use of zinc continues to expand, and the consumption of zinc products increases year by year. The supply of high-quality and high-grade zinc sulfide ore resources is becoming increasingly insufficient. and use are gaining more and more attention. The main problem of wet treatment of high-silicon zinc ore is that the ore contains a large amount of silicon, and the silicon dioxide dissolves out during the leaching of the ore, which easily forms a sol or even a gel, which brings great difficulties to the sedimentation and filtration operations. The fundamental principle to solve this problem can be attributed to two aspects: how to avoid or try to prevent the formation of silica sol during ore leaching; and how to pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/08C22B3/44C25C1/16C22B1/10
CPCC22B1/10C22B3/08C22B3/44C22B19/22C22B19/26C25C1/16Y02P10/20
Inventor 沙涛王志军张存陈强忠
Owner 新疆紫金有色金属有限公司
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