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Treatment method of zinc sulfide ore concentrates

A zinc sulfide concentrate and treatment method technology, applied in the direction of improving process efficiency, etc., can solve problems such as difficult cleaning of autoclave, complicated zinc-making process, and complicated next process, so as to reduce process complexity and production costs, The effect of reducing the process flow and simplifying the process

Inactive Publication Date: 2011-07-27
YUNNAN METALLURGICAL GROUP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, the zinc production process of the two-stage leaching method is relatively complicated, and the zinc leaching rate of the one-stage leaching method has reached about 70%.
At the same time, the leaching slag of the first stage needs to be continuously used in the second stage, and the sulfur in it is also brought into the autoclave of the second stage. Since the melting temperature of sulfur is relatively low, it is easy to melt into liquid sulfur, and at the same time, it is cooled During the process, it is easy to be fixed to the autoclave, which will cause corrosion to the autoclave and bring great difficulties to the cleaning of the autoclave
At the same time, in the leachate of the first stage, although the residual acid has reached 5-10g / L, it still needs to be neutralized in the next purification process, such as adding zinc oxide or lime, which makes the next process more complicated

Method used

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  • Treatment method of zinc sulfide ore concentrates
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Take zinc sulfide concentrate, wherein the zinc content is 37.5wt%, and the iron content is 5.49wt%.

[0061] The zinc sulfide concentrate is finely ground into a mineral powder whose particle size is less than 320 mesh and 100% of the particles are. Add sulfuric acid solution with a concentration of 140g / L to the finely ground mineral powder, stir fully to make the mineral powder slurry, and inject the slurry into the autoclave.

[0062] Commercially pure oxygen was fed into the first autoclave, and the temperature was raised to 150° C., and the oxygen pressure during the reaction was maintained at 1.2 MPa. After 60 minutes, the reaction was completed, and the reacted slurry was discharged, flashed through a flash tank, and then densely filtered and washed to obtain leaching liquid and leaching residue.

[0063] Among them, the leaching slag is flotation to produce crude sulfur and lead-silver slag, the crude sulfur is sent to produce refined sulfur, and the lead-silv...

Embodiment 2

[0070] Take zinc sulfide concentrate, wherein the zinc content is 42.6wt%, and the iron content is 12.5wt%. The zinc sulfide concentrate is finely ground into mineral powder with a particle size of less than 320 mesh and 95% of the particles.

[0071] Add a sulfuric acid solution with a concentration of 150 g / L to the finely ground mineral powder, stir thoroughly to make the mineral powder slurry, and inject the slurry into the first autoclave. Oxygen was introduced into the first autoclave, and the reaction temperature was raised to 160° C., and the oxygen pressure during the reaction was maintained at 0.8 MPa.

[0072] After 75 minutes, the reaction was completed, and the reacted slurry was discharged, flashed through a flash tank, and then densely filtered and washed to obtain leaching liquid and leaching residue. Among them, the leaching slag is flotation to produce crude sulfur and lead-silver slag, the crude sulfur is sent to produce refined sulfur, and the lead-silver ...

Embodiment 3

[0078] Take zinc sulfide concentrate, wherein the zinc content is 46.8wt%, and the iron content is 12.3wt%. The zinc sulfide concentrate is finely ground into mineral powder with a particle size of less than 320 mesh and a particle size of 98%. Add a sulfuric acid solution with a concentration of 145g / L to the finely ground mineral powder, stir fully to make the mineral powder slurry, and inject the slurry into the first autoclave.

[0079] Oxygen was introduced into the first autoclave, and the reaction temperature was raised to 140° C., and the oxygen pressure during the reaction was maintained at 1.0 MPa.

[0080] After 90 minutes, the reaction is completed, and the reacted slurry is discharged, flashed through a flash tank, and then densely filtered and washed to obtain leaching liquid and leaching residue. Among them, the leaching slag is flotation to produce crude sulfur and lead-silver slag, the crude sulfur is sent to produce refined sulfur, and the lead-silver slag i...

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Abstract

The invention discloses a treatment method of zinc sulfide ore concentrates, which comprises the following steps of: (a) mixing and size-mixing the zinc sulfide ore concentrates with a sulfuric acid solution with the concentration of 120 to 170g / L, and supplying to a first pressurizing kettle; (b), subjecting the zinc sulfide ore concentrates to acid leaching to obtain a leaching solution and leaching residue; (c) supplying the leaching solution to a second pressurizing kettle, adding a neutralizing agent and an iron removal agent and simultaneously introducing pure oxygen in, and reacting for a second predetermined time in order to implement neutralization and iron removal and obtain a neutralization solution and neutralization residue; and (d) treating a second leaching solution by adopting zinc hydrometallurgy process in order to obtain metal zinc. Thus, full zinc hydrometallurgy in the true sense is accomplished by using the zinc sulfide ore concentrates as a neutralizing agent, oxygen pressure leaching, neutralization and iron removal are combined in one reaction kettle, thereby simplifying the process flow; and the reaction process is intensified through high temperature and pressurization, thereby further raising the leaching rate of zinc.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for producing zinc by fully wet processing zinc sulfide concentrate. Background technique [0002] Zinc minerals are divided into two categories: sulfide minerals and oxide minerals. Among the ores in nature, sulfide minerals are the most. In industrial production, zinc sulfide concentrate is the main raw material for zinc production. Now, zinc hydrometallurgy is the main zinc smelting method in the world, and its products account for 85% of the world's total output. Traditional zinc hydrometallurgy is actually a combined process of fire and wet methods, including roasting, leaching, purification, electrolysis and There are 5 main processes of acid production. The process characteristics of traditional zinc hydrometallurgy determine that this method must carry out roasting and desulfurization of zinc concentrate, which requires a huge flue gas treatment syste...

Claims

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Application Information

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IPC IPC(8): C22B19/00C22B3/08
CPCY02P10/20
Inventor 王吉坤董英彭建蓉刘本明杨大锦阎江峰张安福
Owner YUNNAN METALLURGICAL GROUP
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