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Technology for extracting tellurium product and valuable metal from lead anode slime

A lead anode slime and valuable metal technology, applied in the field of lead anode slime treatment, achieves the effects of good separation effect, reduced production cost and process saving

Active Publication Date: 2013-08-28
HUNAN HUAXIN RAREANDPRECIOUS METALS TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

It is also acid plus oxidant leaching, and the production process also produces a large amount of slag.

Method used

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  • Technology for extracting tellurium product and valuable metal from lead anode slime

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The composition of the lead anode slime used in the present embodiment is as follows:

[0025] Pb28.22%, Cu19.21%, Te7.03%, Bi25.91%, Ag4.45%;

[0026] The process steps for extracting tellurium products and valuable metals from the above-mentioned lead anode slime are as follows figure 1 .

[0027] The specific process and process parameters are as follows:

[0028] a. Oxidation leaching

[0029] Import the lead anode slime from the lead electrolytic cell into the reaction kettle; use nitric acid to process industrial salt for oxidative leaching, pass steam, control the liquid-solid ratio to 6-8:1 l / g, the concentration of nitric acid is 2.5M, and the industrial salt is 15 ~20 g / l; leaching temperature is 90°C, leaching time is 4-6 hours; stirring, so that valuable copper, bismuth, tellurium and most of the metal lead ente...

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Abstract

The invention discloses a process for extracting a tellurium product and a valuable metal from lead anode slime. The process comprises the following steps of: oxidizing and leaching the lead anode slime by using nitric acid and industrial salt, and separating lead from the lead anode slime in a lead sulfate mode by adding sodium sulfate; depositing silver which is in a silver chloride mode by adding the industrial salt; reverting tellurium ion into thick tellurium powder by using sodium sulfite and the industrial salt, and obtaining fine tellurium by using an electro-deposition method; depositing bismuth in the liquid after the reverting of the tellurium by using caustic soda, and depositing copper by using the electro-deposition method; and thus realizing the comprehensive recovery. The process disclosed by the invention has the advantages of good recovery rate of the tellurium, good separating effect of the copper, the lead, the bismuth and the silver, and no return slag.

Description

technical field [0001] The invention relates to the technical field of lead anode slime treatment, in particular to a process for extracting tellurium products and valuable metals from lead anode slime. Background technique [0002] Tellurium is a rare element, which belongs to semi-metal, and its content in nature is extremely low. According to literature reports, the content of tellurium in the earth's crust is O. The geochemical cycle tends to be dispersed, and it is generally difficult to form independent deposits, so the amount of pure tellurium that humans can obtain is very limited. However, tellurium has a wide range of uses. It is traditionally used as an additive for iron and steel smelting, a submarine cable sheath, a vulcanization accelerator in the rubber industry, and a catalyst in petrochemical industry. In recent years, with the rapid development of high technology, the application field of tellurium has been Continuously broaden, such as cadmium-tellurium s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02C22B30/06C22B13/00C25C1/12
CPCY02P10/20
Inventor 吴声良吴冰明商亚军林锡延
Owner HUNAN HUAXIN RAREANDPRECIOUS METALS TECH CO LTD
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