Method for recovering valuable metals by comprehensively treating high-iron and low-germanium zinc oxide calcine and zinc sulfite

A technology of zinc sulfite and valuable metals, applied in the field of hydrometallurgy, can solve the problems of lowering the grade of germanium concentrate, injury to operators, formation of enrichment and failure to open the circuit, etc., to solve the difficulty of liquid-solid separation and save resources , the effect of avoiding poisoning risk and environmental protection risk

Active Publication Date: 2017-07-04
YUNNAN LUOPING ZINC & ELECTRICITY
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Problems solved by technology

However, the following problems occurred in production: First, a large amount of iron was leached out during the secondary leaching of zinc oxide calcined sand, and it was almost ferric iron, that is, ferric sulfate. Since the filtrate of the primary leaching needs to undergo tannin precipitation and germanium, the acid pH at the end point is controlled to be 2.0~3.5. Most of the ferric iron is hydrolyzed into ferric hydroxide colloids and precipitates in the slag, making filtration difficult, and enrichment cannot be obtained. Moreover, the ferric iron left in the solution without hydrolysis and precipitation is very unfavorable to the next step of tannin precipitation. It seriously consumes tannic acid and reduces

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  • Method for recovering valuable metals by comprehensively treating high-iron and low-germanium zinc oxide calcine and zinc sulfite

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[0031] Example 1

[0032]The high iron and low germanium zinc oxide calcine produced by the hydrometallurgical zinc and electricity multi-heart furnace of Yunnan Luoping Zinc Electric Co., Ltd. and the zinc sulfite produced by the sulfur dioxide tail gas absorption workshop of the rotary kiln were used. The main components of the high iron and low germanium zinc oxide calcine are: zinc 35.06wt%, germanium 0.011wt%, lead 8.14wt%, fluorine 0.010wt%, chlorine 0.009wt%, iron 6.21wt%, silver 0.006wt%; its sulfurous acid The main components of zinc are: zinc 30.09wt%, germanium 0.012wt%, lead 5.98wt%, fluorine 0.0059wt%, chlorine 0.0081wt%, iron 6.88wt%, silver 0.007wt%.

[0033] (1) Primary leaching: use industrial water as the fore solution, take 75 liters, add zinc oxide calcine to 12500.0 g for slurrying, slurry for 30 minutes, adjust the starting acid to 130 g / l with concentrated sulfuric acid, and control the process temperature to 80 ℃, leaching time 1.5 hours, end point pH=...

Example Embodiment

[0042] Example 2

[0043] The high iron and low germanium zinc oxide calcine produced by the hydrometallurgical zinc and electricity multi-heart furnace of Yunnan Luoping Zinc Electric Co., Ltd. and the zinc sulfite produced by the sulfur dioxide tail gas absorption workshop of the rotary kiln were used. The main components of the high iron and low germanium zinc oxide calcining sand are: 44.96wt% zinc, 0.022wt% germanium, 11.96wt% lead, 0.015wt% fluorine, 0.020wt% chlorine, 8.04wt% iron and 0.008wt% silver. The main components of the zinc sulfite are: zinc 39.83wt%, germanium 0.019wt%, lead 10.06wt%, fluorine 0.099wt%, chlorine 0.0098wt%, iron 8.97wt%, silver 0.009wt%.

[0044] (1) Primary leaching: use industrial water as the pre-liquid, take 75 liters, add zinc oxide calcine to 10700.0 g for slurrying, slurry for 40 minutes, adjust the starting acid to 140 g / l with concentrated sulfuric acid, and control the process temperature to 85 ℃, leaching time 2.0 hours, end point p...

Example Embodiment

[0053] Example 3

[0054] The high iron and low germanium zinc oxide calcine produced by the hydrometallurgical zinc multi-heart furnace of Yunnan Luoping Zinc Electric Co., Ltd. and the zinc sulfite produced in the sulfur dioxide tail gas absorption workshop of the rotary kiln are used. After drying, the samples are reduced and prepared for use. The main components of germanium zinc oxide calcine are: zinc 35wt%, germanium 0.01wt%, lead 8wt%, fluorine 0.01wt%, chlorine 0.01wt%, iron 6wt%, silver 0.006wt%. The main components of the zinc sulfite are: zinc 30wt%, germanium 0.01wt%, lead 6wt%, fluorine 0.006wt%, chlorine 0.008wt%, iron 7wt%, silver 0.007wt%.

[0055] 1) Primary leaching: Slurry zinc oxide calcined sand at a liquid-solid ratio of 6:1 with a slurry solution, the slurrying time is 30 minutes, the initial acid is adjusted to 130g / l with concentrated sulfuric acid, and the process temperature is controlled to 80°C and the leaching time After 1.5 hours and endpoint p...

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Abstract

The invention discloses a method for recovering valuable metals by comprehensively treating high-iron and low-germanium zinc oxide calcine and zinc sulfite. The method comprises the following steps: 1) primary leaching of zinc oxide calcine; 2) secondary leaching of zinc oxide calcine; 3) zinc sulfite analysis and ferric reduction; and 4) tannin germanium precipitation. In the process of recovering valuable metals by comprehensive treatment, the zinc sulfite analysis and the reduction of ferric ions, namely ferric sulfate in a solution into ferrous ions, namely ferrous sulfate are completed at one step by using a simple and convenient method, so that resources are sufficiently recycled, and the production cost is reduced; and the problems that zinc and germanium are recovered by analyzing zinc sulfite into a zinc sulfate solution and the ferric ions in a system for recovering zinc and germanium from the zinc oxide calcine cannot form an open path because of being enriched are simultaneously solved, meanwhile, the filtering performance for liquid-solid separation of the whole production system is also improved to ensure that the solution is clear and has no suspended matters, and consumption of tannic acid can be reduced and the grade of a germanium concentrate can be improved in the tannin germanium precipitation process.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for comprehensively treating high-iron, low-germanium zinc oxide calcine and zinc sulfite to recover valuable metals. Background technique [0002] In the production process of zinc hydrometallurgy, zinc concentrate is boiled and roasted to produce roasted ore for zinc hydrometallurgy and high-concentration sulfur dioxide flue gas for acid production. After the roasted ore undergoes neutral leaching, the germanium and iron in it are enriched in the leaching slag, and the leaching slag is volatilized by a rotary kiln to recover zinc and other valuable metals, and zinc oxide fumes for defluorination and chlorine are produced and used for production Low concentrations of sulfur dioxide gas from zinc sulfite. If the content of germanium in the raw materials for zinc smelting is too low and the impurity elements such as iron, fluorine, and chlorine are hi...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B41/00C22B19/20C22B13/00C22B11/00
CPCC22B3/08C22B3/44C22B11/04C22B13/04C22B19/22C22B41/00Y02P10/20
Inventor 赵德军杨建兴李尤立赵兵伍赵保灿周立雄陈长浩赵菊华保明龙龙国心黎敬茂江澄刘建平
Owner YUNNAN LUOPING ZINC & ELECTRICITY
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