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Leaching process of zinc oxide ore

A zinc oxide ore and leaching technology, which is applied in the field of hydrometallurgy, can solve the problems of uneconomical, increased consumption of neutralizer and sulfuric acid, and large loss of zinc with slag, so as to avoid consumption and increase the leaching rate.

Inactive Publication Date: 2004-02-25
YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "desiliconization slag" produced by this method is quite loose, has poor sedimentation performance, and the water content of the slag after filtration is very high, so the loss of zinc along with the slag is also very large; if the zinc in the slag is recovered by washing, The water consumption is very large; although the zinc leaching rate of this method is high, the amount of iron and silicon entering the solution is also high. In the neutralization stage, acid will be produced with the hydrolysis of iron ions, which requires more neutralization. Neutralize this part of the acid with an agent, resulting in a large amount of gypsum, which not only increases the amount of slag, but also increases the consumption of neutralizer and sulfuric acid. Therefore, this process is uneconomical for zinc oxide ore containing silicon and high iron.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Select zinc oxide ore, its chemical composition is Zn26.55%, Fe18.20%, SiO 2 7.94%, of which zinc phase components are 24.23% zinc carbonate, 1.25% zinc silicate, 0.73% zinc sulfide, and 0.34% iron-zinc spinel. After the minerals are crushed and ground, they are neutrally leached with waste electrolyte. That is, the condition is that the initial value is PH3, the end point is PH5.2, and the uniform stirring is for 120-180 minutes; solid-liquid separation is carried out, the leaching liquid is used for electrolysis, and sulfuric acid solution is added to the leaching residue for low-acid leaching. The pH value starts from The PH5.2 gradually drops to PH1.5, then solid-liquid separation, and the supernatant is returned to the neutral leaching section for recycling. The main indicators are as follows:

[0013] Zinc leaching recovery rate: 91.88%

[0014] Cadmium leaching recovery rate: 95.86%

[0015] Slag rate: 55.45%

[0016] Zinc in slag: 3.89%

[0017] Slag filt...

Embodiment 2

[0018] Example 2: Select high-silicon zinc oxide ore, its chemical composition is Zn21.68%, Fe17.95%, SiO 2 18.91%, CaO6.65%, as in the above example, after crushing and pulverizing the minerals, use waste electrolyte for neutral leaching, that is, the initial value is PH3, the end point is PH5.2, and the uniform stirring is carried out for 120-180 minutes; Solid-liquid separation, the leaching liquid is used for electrolysis, adding sulfuric acid solution to the leaching residue for low-acid leaching, the PH value gradually drops from the initial PH5.2 to PH2.0, and then solid-liquid separation, the supernatant returns to neutral The leaching section is recycled. The main indicators are as follows:

[0019] Zinc leaching recovery rate: 89.7%

[0020] Filtration speed of acid leaching pulp: 606.2L / m 2 h

[0021] Slag rate: 64.5%

[0022] Zinc content in slag: 3.46%

Embodiment 3

[0023] Example 3: Select zinc oxide concentrate, the chemical composition of which is Zn26.55%, Fe18.20%, SiO 2 7.94%, of which zinc phase components are 24.23% zinc carbonate, 1.25% zinc silicate, 0.73% zinc sulfide, and 0.34% iron-zinc spinel. After the minerals are crushed and ground, they are neutrally leached with waste electrolyte. That is, the condition is that the initial value is PH3, the end point is PH5.2, and the uniform stirring is for 120-180 minutes; solid-liquid separation is carried out, the leaching liquid is used for electrolysis, and sulfuric acid solution is added to the leaching residue for low-acid leaching. The pH value starts from The PH5.2 gradually drops to PH1.5, then solid-liquid separation, and the supernatant is returned to the neutral leaching section for recycling. The main indicators are as follows:

[0024] Zinc leaching recovery rate: 91.88%

[0025] Cadmium leaching recovery rate: 95.86%

[0026] Slag rate: 55.45%

[0027] Zinc in slag: 3.89%

...

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Abstract

The present invention relates to a leaching-out method of zinc ore containing high iron and silicone. It includes the following steps: (1). neutral leaching-out, simultaneously adding zinc oxide powder and solution containing sulfuric acid and stirring, progressively raising pH value to 5-5.2 from initial 3.0-3.5, and purifying the reacted neutral leach and using it for electrolysis, and using the leached slag make next leaching-out; (2). low acid leaching-out, in the leached slag adding sulfuric acid solution and stirring, controlling pH value and making it progressively be reduced to 1.5-3.0 from 5-5.2; and (3). circulating waste liquor, solid-liquid separating second leached material, and returning the waste liquor contaiing sulfuric acid into neutral leaching-out stage of zinc oxide ore.

Description

Technical field [0001] The invention belongs to the hydrometallurgical technology, especially the leaching method of zinc ore containing high iron and silicon. technical background [0002] When traditional hydrometallurgy is used to extract zinc from ore, zinc sulfide ore is generally used as a raw material because of its high zinc content and relatively easy extraction. With years of mining, the source of this kind of ore has become less and less, and the grade has gradually decreased. People have begun to pay attention to the use of zinc oxide ore. However, zinc oxide ore usually has a low zinc content and a complex composition. Most of the zinc ore and hemimorphite exist. The iron, silicon, and calcium content in the ore is large, making it difficult to extract. In recent years, most of the methods for leaching zinc oxide ore at home and abroad (such as the method of Kunming Metallurgical Research Institute Du Shuzhi) are leaching zinc oxide ore with a strong acid-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08
CPCY02P10/20
Inventor 舒毓璋宝国峰张琦杨龙
Owner YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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