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Process for comprehensive recovery of indium, cadmium, thallium and zinc from lead system smoke

A soot and new process technology, applied in the field of non-ferrous metal smelting, can solve the problems of using more equipment, wasting resources, and not considering recycling, and achieve the effect of reducing equipment investment and increasing efficiency

Inactive Publication Date: 2008-09-03
HENAN YUGUANG GOLD & LEAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single indium recovery process only considers the recovery of indium, but does not consider the recovery of cadmium and zinc that are leached at the same time as indium
The single cadmium recovery process only considers the recovery of cadmium, but does not consider the recovery of zinc and thallium that are leached at the same time as cadmium
Firstly, it causes a waste of resources; secondly, the heavy metal content in wastewater is high, and it is not easy to reach the standard after treatment, thus causing environmental pollution; thirdly, single recycling will cause the disadvantages of using more equipment and investing more

Method used

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  • Process for comprehensive recovery of indium, cadmium, thallium and zinc from lead system smoke
  • Process for comprehensive recovery of indium, cadmium, thallium and zinc from lead system smoke
  • Process for comprehensive recovery of indium, cadmium, thallium and zinc from lead system smoke

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Embodiment

[0036]Example: 1 ton of reverberatory furnace (containing 1.4 kg of indium) soot is leached by adding water and sulfuric acid, the liquid-solid ratio is 2:1, the temperature is about 90°C, the time is 4 hours, the initial acidity is 300-350g / l, the reaction is completed and diluted with water When the final acid is 70-80g / l, add zinc oxide to the neutralization pool to adjust the final acid content to 10-20g / l, and press filter. The output leaching residue is about 0.8 tons, and the leaching liquid is 4m 3 about. The leaching solution enters the settling tank to settle, and then enters the extraction process through the high level tank. The organic phase used for extraction is P 204 Add sulfonated kerosene, P in the organic phase 204 20-35%, sulfonated kerosene 65-80%, the volume ratio of the organic phase and the inorganic phase during the extraction process is 3:7, the extraction temperature is normal temperature, the number of stages: 5, and the mixing time is 12 minutes...

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Abstract

The invention relates to a method for comprehensively recycling indium, cadmium , thallium and zinc from electric precipitation dust and reverberator dust in a lead smelting system. Indium in the reverberator dust is recycled by leaching, extracting, back extracting and cementing, the post-replacing liquid can be used for recycling zinc butter or preparing nanometer zinc oxide, middle faffinate is used for leaching electric precipitation dust, cementing out cadmium and further producing pure cadmium, the residual liquid mainly includes zinc sulfate solution as the raw material for preparing zinc oxide, zinc sulfate monohydrate, zinc vitriol to recycle zinc, the slag produced in the leaching process is returned to a lead system for recycling lead, secondary cementing slag produced by a cadmium system is pile-up oxidized and leached by alkali, the slag is returned to the cadminum system for recycling cadmium and zinc, the liquid is added with sulphuric acid to adjust the pH value, then thallium is recycled by a zinc plate. The process takes indium recycle and cadmium recycle into consideration and optimizes the process, indium, cadmium , thallium and zinc in the raw material are recycled at the same time, so that better economical benefit can be produced.

Description

technical field [0001] The invention belongs to the non-ferrous metal smelting industry, and in particular relates to a process for comprehensively recovering indium, cadmium, thallium and zinc from the soot produced in a lead smelting system for extracting indium, cadmium, thallium and zinc from lead system soot. Background technique [0002] At present, the relatively mature lead smelting processes in China mainly include sintering machine-blast furnace smelting, bottom blowing furnace oxidation-blast furnace reduction smelting to produce crude lead. The process adopted in bottom-blowing furnace lead smelting is mainly that the lead concentrate enters the bottom-blowing furnace through batching, and blows oxygen into the bottom for smelting, which can obtain high-lead slag and part of crude lead and produce high-concentration sulfur dioxide flue gas. During the process of processing lead concentrate by the bottom blowing furnace system, the flue gas generated passes throug...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B3/08C22B58/00C22B17/00C22B19/00C22B61/00
CPCY02P10/20
Inventor 赵传和狄聚才汤伟刘素红赵高峰王文胜
Owner HENAN YUGUANG GOLD & LEAD
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