Method for recovering valuable metals from high-silicon low-germanium and low-indium zinc oxide soot

A valuable metal, zinc oxide technology, applied in the field of hydrometallurgy, can solve the problems of serious organic phase emulsification, high suspended solids, high silicon content, and achieve the effects of low water content, recycling, and comprehensive recycling.

Active Publication Date: 2016-08-10
YUNNAN LUOPING ZINC & ELECTRICITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] A large number of tests have proved that the zinc oxide fume is leached with an acidic acid using the traditional method. At the point of controlling the acid pH requirements at the end point of the germanium precipitation of tannins, that is, when the pH is 2.0~3.5, the germanium in the leach solution is only 20mg/l~30mg /l or so, indium is about 0.1mg/l~0.2mg/l, and silicon dioxide is as high as 4g/l~8g/l. Since a large amount of leached silicon forms silica gel at this time, its liquid-solid separation is very difficult, and the resulting The filtrate produced is not clear and has a lot of suspended matter; using this filtrate to carry out tannin precipitation of germanium is not only very difficult for liquid-solid separation, but the tannin ratio is as high as more than 50 times, and the germanium concentr

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  • Method for recovering valuable metals from high-silicon low-germanium and low-indium zinc oxide soot

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Zinc oxide fumes produced by volatilization of rotary kiln leaching slag from wet smelting zinc electricity Co., Ltd. in Yunnan Luoping Zinc Electric Co., Ltd. were dried and shrunk to 20,000.00 grams for sample preparation. The ingredients were: zinc 50.18wt%, germanium 0.0208wt %, indium 0.0153wt%, lead 6.58wt%, silicon dioxide 5.43wt%, silver 0.0030wt%, iron 4.27wt%.

[0040] (1) Primary leaching: use industrial water as pre-liquid, take 72 liters, add zinc oxide fume to 12000.0 grams for slurrying, slurrying time is 20 minutes, adjust initial acidity to 120g / l with concentrated sulfuric acid, control process temperature 75°C , The leaching time is 1.0 hours, and the end point pH=1.1, then filter 1. Filtration 1 produces No. 1 leaching residue for secondary leaching and contains 107.67g / l zinc, 0.021g / l indium, 6.54 g / l silicon dioxide, 0.028g / l germanium, 0.0026 g / l lead, and 0.00019g / l silver 1. 48.50 liters of No. 1 leach solution of ferrous iron 7.14g / l and ferr...

Embodiment 2

[0052] Zinc oxide fumes produced by rotary kiln volatilization of leaching slag from wet smelting zinc electricity Co., Ltd. in Yunnan Luoping Zinc Electric Co., Ltd. After drying, 18,000.00 grams of samples were prepared by shrinking and dividing. The components are: zinc 55.08wt%, germanium 0.0306wt %, indium 0.0249wt%, silicon dioxide 8.08wt%, lead 9.96wt%, silver 0.0048wt%, iron 5.94wt%.

[0053] (1) Primary leaching: Use industrial water as the pre-liquid, take 70 liters, add zinc oxide fume to 10000.0 grams for slurrying, the slurrying time is 30 minutes, adjust the initial acid to 130g / l with concentrated sulfuric acid, and control the process temperature to 85°C , the leaching time is 1.5 hours, and the end point pH=1.5, then filter 1; the output No. 1 leaching slag is subjected to secondary leaching and contains 100.79g / l zinc, 0.0301g / l indium, 9.06 g / l silicon dioxide, and 0.0358g germanium 47.0 liters of No. 1 leach solution of / l, lead 0.0027g / l, silver 0.0002g / l,...

Embodiment 3

[0065] Zinc oxide fumes produced by rotary kiln volatilization of leaching slag from hydrometallurgy of Yunnan Luoping Zinc Electric Co., Ltd., containing 50wt% zinc, 0.02wt% germanium, 0.015wt% indium, 6wt% lead, and 5wt% silicon dioxide %, silver 0.003wt%, iron 4wt%.

[0066] 1) Primary leaching: Slurry zinc oxide dust with zinc electrolysis waste liquid at a liquid-solid ratio of 6:1 for 25 minutes, adjust initial acid 125g / l with concentrated sulfuric acid, control process temperature at 80°C, and leaching time After 1.2 hours and the end point pH=1.2, filter 1, filter 1 to produce No. 1 leaching residue and No. 1 leaching solution, No. 1 leaching residue for secondary leaching, and No. 1 leaching solution for silicon purification and adsorption;

[0067] 2) Secondary leaching: Slurry No. 1 leaching slag with industrial water at a liquid-solid ratio of 4:1, use concentrated sulfuric acid to adjust the initial acid to 135g / l, control the process temperature to 92°C, the lea...

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Abstract

A method for recovering valuable metals from high-silicon low-germanium and low-indium zinc oxide soot includes the steps of (1) primary leaching, (2) secondary leaching, (3) silicon purification and adsorption, (4) indium deposition through neutralization and (5) germanium deposition through tannin. Through the simple and convenient method, purification and removal of silicon and the adsorption performance of amorphous carbon are combined, so that full recycling of resources is achieved. Through the adsorbability of the amorphous carbon, the filtering performance in solid-liquid separation during silicon purification is well improved, an effective carrier is provided for suspended matter in a solution, and therefore filter liquor is clear and free of suspended matter. By means of the method, the influence of silicon and suspended matter on indium and germanium deposition is eliminated, and the effects of burning heat generation and reduction of the added amorphous carbon can be played normally in the volatilization process of a rotary kiln. Under the conditions that the grade of indium and germanium in raw materials is low and the grade of silicon dioxide is high, interference of silicon and suspended matter is avoided, and germanium and indium are smoothly recovered.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for recovering valuable metals from high-silicon, low-germanium, and low-indium zinc oxide dust. Background technique [0002] Most of the raw materials used in zinc hydrometallurgy contain a certain amount of germanium and indium, and some are difficult to be recycled because the content is too low. In the production process of zinc hydrometallurgy, most of the germanium and indium are enriched in the leaching slag after neutral leaching of the raw materials, and the leaching slag is volatilized in a rotary kiln to recover zinc, while valuable metals such as germanium, indium, and lead are also volatilized It is enriched in zinc oxide dust; however, the content of germanium and indium in some zinc smelting raw materials is too low, and the content of germanium and indium in the produced zinc oxide dust is not high. The zinc oxide dust produced by our company ...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B41/00C22B58/00C22B19/30C22B11/00C22B13/00
CPCC22B7/007C22B7/02C22B11/044C22B13/045C22B19/30C22B41/00C22B58/00Y02P10/20
Inventor 杨建兴赵德军赵兵伍陈长浩周立雄赵菊华赵保灿陈会东龙国心
Owner YUNNAN LUOPING ZINC & ELECTRICITY
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