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Pressure leaching method for high silica zinc oxide ore

A zinc oxide ore and pressure leaching technology, which is applied in the field of leaching of high-silicon zinc oxide ore, can solve the problems of high cost, lengthy process flow, lengthy production process, etc., and achieve high-efficiency leaching and good filtration performance.

Inactive Publication Date: 2008-10-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention combines acid leaching and alkali leaching to avoid the formation of silica gel and obtain a leaching solution with a higher zinc ion concentration, but there are problems such as lengthy process flow, low production efficiency, and difficulty in meeting the needs of zinc industrial production.
[0011] The above-mentioned method for leaching zinc from high-silicon zinc oxide ore, if alkaline leaching is used, the adaptability of the process to materials is poor, and it is difficult to obtain a high-concentration zinc electrolyte; A large amount of soluble silicon is dissolved to form silica gel, which affects the filtration performance of the pulp
In the industry, slowly add acid leaching or add some kind of flocculant in the pulp, resulting in lengthy production process, low efficiency and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] High silicon zinc oxide composition: Zn: 32.96%, Fe: 2.8%, SiO 2 : 63.71%;

[0029] Combining high silicon zinc oxide ore with Zn 2+ 50g / L, 148g / L industrial zinc electrolytic waste liquid with free acid is mixed according to the liquid-solid ratio of 4:1 (that is, the volume to mass ratio, every 4L electrolytic waste liquid is compared to 1kg high-silicon zinc oxide ore), and the pressure pump is used to continuously Pump into a stainless steel autoclave, use steam or tap water to control the conversion temperature in the autoclave to 180°C, stir at a speed of 650r / min, feed oxygen-enriched air to maintain the autoclave pressure at 1.5MPa, and leaching for 120 minutes. After the leaching is completed, the leaching pulp is separated into liquid and solid, and the obtained leachate is processed by a conventional mature process to produce electric zinc. The main indicators are as follows:

[0030] Zinc leaching rate is 98.53%, silicon leaching rate is 0.55%, slag filtr...

Embodiment 2

[0032] High silicon zinc oxide composition: Zn: 20.81%, Fe: 10%, SiO 2 : 49.33%;

[0033] Combining high silicon zinc oxide ore with Zn 2+ 55g / L, free acid 120g / L industrial zinc electrolysis waste liquid is adjusted according to the liquid-solid ratio (volume-to-mass ratio) of 3:1, and continuously pumped into the pressure vessel lined with titanium materials by a booster pump, and steamed Or tap water to control the conversion temperature in the kettle to 150°C, the stirring speed to 750r / min, feed industrial oxygen to maintain the pressure in the kettle at 0.8MPa, and leaching for 90 minutes. After the leaching is completed, the leaching pulp is separated into liquid and solid, and the obtained leachate is processed by a conventional mature process to produce electric zinc. The main indicators are as follows:

[0034] Zinc leaching rate is 97.3%, silicon leaching rate is 0.72%, pulp filtration rate is 1620L / m 2 h.

Embodiment 3

[0036] High silicon zinc oxide composition: Zn: 40%, Fe: 1.74%, SiO 2 : 37.93%;

[0037] Combining high silicon zinc oxide ore with Zn 2+ 45g / L, free acid 170g / L industrial zinc electrolysis waste liquid is adjusted according to the liquid-solid ratio (volume-to-mass ratio) of 5:1, continuously pumped into the stainless steel-lined pressure kettle with a booster pump, and steamed or tap water Control the conversion temperature in the kettle to 120°C, the stirring speed to 500r / min, feed industrial oxygen to maintain the pressure in the kettle at 1.2MPa, and leaching for 150 minutes. After the leaching is completed, the leaching pulp is separated into liquid and solid, and the obtained leachate is processed by a conventional mature process to produce electric zinc. The main indicators are as follows:

[0038] Zinc leaching rate is 98.87%, silicon leaching rate is 0.23%, pulp filtration rate is 1800L / m 2 h.

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Abstract

The invention relates to a hydrometallurgical technology for zinc oxide ore, in particular to a leaching method for high silicon zinc oxide ore. The method of the invention is as follows: the high silicon zinc oxide ore and commercial zinc waste electrolyte with Zn2+ of free sulphuric acid are in size mixing, and then are putted into an autoclave to perform pressuring and leaching reaction, the reacted ore slurry undergoes liquid-solid separation to obtain leaching solution with zinc, and the obtained leaching solution with zinc is processed to obtain electrolytic zinc through a conventional mature technology. The leaching method for high silicon zinc oxide ore intensifies the leaching process of zinc in zinc oxide ore, realizes zinc leaching with high efficiency in the high silicon zinc oxide ore; through using the leaching method for the high silicon zinc oxide ore, silicon in the ore almost is remained in residue in the process of pressuring and leaching, the silica content of the leaching solution is less than 0.8 percent, and the ore slurry easy to filter is obtained; and the leaching solution with zinc is processed to obtain the electrolytic zinc through the conventional mature technology directly.

Description

technical field [0001] The invention relates to a hydrometallurgical technology of zinc oxide ore, in particular to a leaching method of high-silicon zinc oxide ore. technical background [0002] When traditional hydrometallurgy is used to extract zinc from zinc-containing minerals, zinc sulfide ore is generally used as raw material, because its zinc grade is high and the extraction is relatively easy. With the expansion of the scope of zinc use, the consumption of zinc products in various countries in the world is increasing year by year, and the supply of zinc sulfide ore is gradually insufficient. The mining and utilization of zinc oxide ore has gradually attracted people's attention. Zinc oxide ore usually has a low zinc content and complex composition, mainly containing zinc silicate ore Zn 2 SiO 4 , hemimorphite Zn 4 (Si 2 o 7 )(OH) 2 ·H 2 O and smithsonite ZnCO 3 of zinc minerals. The ore contains high soluble silicon, iron, calcium, and magnesium. Acidic lea...

Claims

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Application Information

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IPC IPC(8): C22B3/08
Inventor 魏昶李存兄樊刚
Owner KUNMING UNIV OF SCI & TECH
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