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Comprehensive recovery method for valuable metals in lead-zinc smelting acid mud

A technology of valuable metals and recycling methods, applied in the direction of element selenium/tellurium, process efficiency improvement, etc., can solve problems such as mercury pollution, achieve high purity, clean and environmentally friendly process, and short processing time

Pending Publication Date: 2021-07-09
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention can realize high-efficiency recovery of lead, silver, selenium, and mercury. The recovery of mercury and selenium can reach more than 96%, and the recovery of lead and silver can reach 99%. Utilizing the technology of the invention can realize high-value utilization of acid sludge , and solved the problem of mercury pollution in production very well. The acid mud treatment process is closed and does not directly contact people during the production process, which ensures the safety of production and has a good prospect for popularization and application.

Method used

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  • Comprehensive recovery method for valuable metals in lead-zinc smelting acid mud
  • Comprehensive recovery method for valuable metals in lead-zinc smelting acid mud

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The main phases of lead-zinc smelting acid mud include lead sulfate, mercury sulfide, mercury selenide, and mercury chloride, with a water content of 18.40%. It contained 22.04% lead on a dry basis, 1.29% mercury, 1.59% selenium and 717.8g / t silver.

[0043] (1) The lead-zinc smelting acid mud is subjected to fire roasting treatment, the fire roasting method is microwave heating, the temperature is 400 ° C, the holding time is 20 minutes, and the air is passed during roasting. After roasting, easy-to-handle mercury-containing phases and residual lead-silver slag are obtained. After analysis, the lead content in the residual lead and silver slag is 96.06%, and the silver content is 1205.5g / t.

[0044] (2) The easy-to-handle mercury-containing phase is condensed in stages to obtain a crude mercury and a second-stage selenium-mercury material respectively. Mercury content in crude mercury: 99.9%.

[0045](3) The sulfuric acid solution added with potassium permanganate i...

Embodiment 2

[0048] The main phases of lead-zinc smelting acid mud include lead sulfate, mercury sulfide, mercury selenide, and mercury chloride. The water content is 27%. It contained 41% lead on a dry basis, 22% mercury, 4% selenium and 900g / t silver.

[0049] (1) The lead-zinc smelting acid mud is subjected to fire roasting treatment. The fire roasting method is microwave heating, the temperature is 600 ° C, the holding time is 40 minutes, and oxygen is passed through during roasting. After roasting, easy-to-handle mercury-containing phases and residual lead-silver slag are obtained. After analysis, the lead content in the residual lead and silver slag is 97.4%, and the silver content is 1600g / t.

[0050] (2) The easy-to-handle mercury-containing phase is condensed in stages to obtain a crude mercury and a second-stage selenium-mercury material respectively. Mercury content in crude mercury: 99.9%.

[0051] (3) The sulfuric acid solution added with potassium permanganate is used for...

Embodiment 3

[0055] The main phases of lead-zinc smelting acid mud include lead sulfate, mercury sulfide, mercury selenide, and mercury chloride. The water content is 37.74%. The dry basis contained 62.76% lead, 43.88% mercury, 6.89% selenium and 1120.2g / t silver.

[0056] (1) The lead-zinc smelting acid mud is subjected to fire roasting treatment. The fire roasting method is microwave heating, the temperature is 800°C, the holding time is 60 minutes, and oxygen is passed through during roasting. After roasting, easy-to-handle mercury-containing phases and residual lead-silver slag are obtained. After analysis, the lead content in the residual lead and silver slag is 96.06%, and the silver content is 1881.5g / t.

[0057] (2) The easy-to-handle mercury-containing phase is condensed in stages to obtain a crude mercury and a second-stage selenium-mercury material respectively. Mercury content in crude mercury: 99.9%.

[0058] (3) The sulfuric acid solution added with potassium permanganate...

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Abstract

The invention relates to a comprehensive recovery method for valuable metals in lead-zinc smelting acid mud, and belongs to the technical field of hazardous waste resource development and utilization. The method is mainly divided into two steps according to the form of a mercury-containing phase, the mercury-containing phase easy to treat is directly subjected to pyrogenic roasting and volatilization recovery, the selenium-containing and mercury-containing phase difficult to treat is converted into the phase easy to treat through wet leaching, and then the easy-to-treat phase is further treated and recycled; and mercury in the acid mud is recovered in the form of elemental mercury, selenium is recovered in the form of crude selenium, and the lead and silver residues are returned to a Isa furnace for smelting and recovery. According to the method, deep removal and separation of mercury and selenium and efficient recovery of lead, silver, selenium and mercury can be achieved, the recovery rate of mercury and selenium can reach 96% or above, the recovery rate of lead and silver can reach 99%, high-valued utilization of the acid mud can be achieved through the technology, the problem of mercury pollution in production is well solved, the acid mud treatment process is closed, and direct contact with people is avoided in the production process, so that the production safety is ensured, and good popularization and application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of development and utilization of hazardous waste resources, and in particular relates to a method for comprehensively recovering valuable metals in lead-zinc smelting acid mud. Background technique [0002] During the acid washing process of lead-zinc smelting flue gas, the strong impact of high-temperature flue gas and dilute acid will produce a foam area where gas and liquid are mixed, and then form multiple liquid films in the flue gas pipeline. When the gas passes through these films Mineral dust particles containing arsenic, mercury and selenium are left, and the liquid-solid separation obtains acid mud containing selenium and mercury. Acid slime is mainly composed of valuable components such as lead, silver, mercury, and selenium. It is a hazardous solid waste with economic recovery value. The unreasonable use of acid slime not only wastes valuable resources such as lead, silver, mercury, and selenium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B43/00C01B19/02
CPCC22B7/007C22B1/02C22B43/00C01B19/02Y02P10/20
Inventor 杨大锦马雁鸿杨伟李衍林周开敏代龙果侯郊裴启飞何勇毅何宗云卢文鹏
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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