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.

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.

CN1477217AInactive Publication Date: 2004-02-25YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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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

Patent Timeline
25 Feb 2004
Publication
CN1477217A
IPC
C22B3/08
CPC
Y02P10/20
Inventors
舒毓璋; 宝国峰