Environment-friendly metallurgy extracting method for lead-zinc oxide ores

A technology for oxidizing lead and zinc and oxidizing ore, which is applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of difficult discharge, increase the treatment of lead system wastewater, and difficulty in solution circulation, and achieve strong adaptability and lightening. burden, avoid large cumulative effects

Inactive Publication Date: 2017-03-15
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

At the same time, in order to realize the recovery of lead, the lead system mostly adopts different solution systems from the zinc system (mostly sulfuric acid system), such as alkaline system, chloride salt system, etc. On the one hand, in the existing technical methods, the solution circulation of the lead system is difficult, and the solution A large number of open circuits are required and it is difficult to deal with standard discharge; on the other hand, to avoid H in the zinc system + , SO 4 2- As a large amount of zinc leaching slag enters the lead system, a large amount of washing is required, and large-scale production cannot be practiced
The lead system is basically an independent system, and it is difficult to form an organic whole with the zinc system, so as to realize the circulation of solutions and materials, such as: the SO in lead sulfate produced by the zinc system according to the current technical method 4 2- When the lead system enters the solution and acts as an impurity in the wastewater, it needs to be opened, which increases the treatment of the lead system wastewater, while the zinc system also needs to supplement a large amount of sulfuric acid consumed by lead.
All in all, the above-mentioned technical method is feasible in principle, but it is not enough to support the economic development of industrial-scale lead-zinc oxide ore from the perspective of application

Method used

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  • Environment-friendly metallurgy extracting method for lead-zinc oxide ores

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Experimental program
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Effect test

Embodiment 1

[0051] First, lead-zinc oxide and coal are mixed at a coal ratio of 45% and sent to a rotary kiln for reduction and volatilization. The temperature is 1300°C and the volatilization time is 90 minutes; , cement, paving materials. Volatile smoke is collected to obtain oxide powder, which contains 62% Zn and 13.5% Pb. Neutral leaching with acidic leaching solution, H 2 SO 4 70g / L, liquid-solid ratio 3:1, temperature 75-80°C, leaching time 60-70min, leaching end pH 5.0-5.5. After the neutral leaching, the solution is routinely purified, the cathode zinc is deposited after electrowinning, and the zinc ingot (purity 99.99-99.995%) is obtained by melting and casting. The neutral leaching slag is acid leached with zinc electrolytic waste liquid and lead electrolytic waste liquid. Fe in solution 总 2 SO 4 The concentration is 120g / L; the lead sulfate slurry is continuously added to the suspension electrolyzer at a certain speed, and the cathode current density is 250A / m 2 , lead...

Embodiment 2

[0053] First, lead-zinc oxide and coal are mixed at a coal ratio of 55% and sent to a rotary kiln for reduction and volatilization. The temperature is 1200°C and the volatilization time is 120 minutes; , cement, paving materials. Volatile fumes are collected to obtain oxide powder, which contains 63.5% Zn and 14.5% Pb. Neutral leaching with acidic leaching solution, H 2 SO 4 50g / L, liquid-solid ratio 3:1, temperature 75-80°C, leaching time 80-90min, leaching end pH 5.0-5.5. After the neutral leaching, the solution is routinely purified, the cathode zinc is deposited after electrowinning, and the zinc ingot (purity 99.99-99.995%) is obtained by melting and casting. The neutral leaching slag is acid leached with zinc electrolytic waste liquid and lead electrolytic waste liquid. The initial acid of leaching is 150g / L, the liquid-solid ratio is 3:1, the temperature is 85-90°C, and the time is 90min. Fe in solution 总 2 SO 4 The concentration is 150g / L; the lead sulfate slurry ...

Embodiment 3

[0055] First, lead-zinc oxide and coal are mixed with 60% coal and sent to the rotary kiln for reduction and volatilization. The temperature is 1250°C and the volatilization time is 110 minutes; , cement, paving materials. Volatile fumes are collected to obtain oxide powder, which contains 65.5% Zn and 13.5% Pb. Neutral leaching with acidic leaching solution, H 2 SO 4 30g / L, liquid-solid ratio 3:1, temperature 75-80°C, leaching time 80-90min, leaching end pH 5.0-5.5. After the neutral leaching, the solution is routinely purified, the cathode zinc is deposited after electrowinning, and the zinc ingot (purity 99.99-99.995%) is obtained by melting and casting. The neutral leaching slag is acid leached with zinc electrolytic waste liquid and lead electrolytic waste liquid. The initial acid of leaching is 200g / L, the liquid-solid ratio is 3:1, the temperature is 90-95°C, and the time is 80min. The acidic leaching liquid is neutralized to remove iron and iron. Fe in solution 总...

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Abstract

The invention discloses an environment-friendly metallurgy extracting method for lead-zinc oxide ores, and belongs to the field of lead zinc ore metallurgy. The method comprises the following steps: reducing and volatilizing the lead-zinc oxide ores to obtain high-quality lead-zinc oxide enrichment, and separating lead and zinc from other impurities in raw ores; carrying out sulfuric acid leaching-purifying-electrodeposition on the lead-zinc oxide enrichment to obtain cathode zinc, and casting to obtain zinc ingot products; and after slurrying zinc leaching residues, continuously adding in a suspension electrolytic bath for producing lead powder by electrodeposition, and after washing, filtering and briquetting the lead powder, smelting into lead bullion. The lead and the zinc are highly enriched effectively by pyrogenic-process reduction and volatilization, and influence of impurities such as Fe, Si, Ca, Mg and Al to a smelting process is greatly reduced; and the zinc and the lead are effectively extracted in a sulfuric acid system to directly obtain the cathode zinc and the lead bullion, organic circulation of lead and zinc smelting systems is realized, consumption of energy and materials is greatly reduced, meanwhile, 'zero' consumption of sulfuric acid, 'zero emission' of waste water and 'zero' emission of smelting wastes are realized simultaneously, and the environment-friendly metallurgy extracting method for the lead-zinc oxide ores is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of extraction and metallurgy of lead-zinc ore, and relates to a green metallurgical extraction method of oxidized lead-zinc ore. Background technique [0002] With the development and utilization of lead-zinc ore resources at home and abroad, high-grade lead-zinc sulfide ore resources are increasingly exhausted, and the development and treatment of lead-zinc oxide ore has become inevitable. [0003] Oxidized lead-zinc ore has a high degree of oxidation and high mud content, and it is difficult to improve the quality of ore dressing; the grade of lead and zinc in the raw ore is low, and the content of alkaline oxides such as CaO and MgO is high, and the cost of direct smelting remains high; the overall design idea of ​​​​current industrial development "Zinc-based", for high-grade lead-zinc oxide ore, sulfuric acid leaching method is generally used at home and abroad to obtain leachate, and then conventional m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C25C1/18C25C1/16C25C5/02
CPCC22B19/20C22B19/22C25C1/16C25C1/18C25C5/02Y02P10/20
Inventor 蒋开喜王海北刘三平冯亚平魏帮邹小平李相良
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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