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Method for efficiently recovering scattered metal tellurium from cuprous telluride slag

A technology for cuprous telluride slag and scattered metal, which is applied to the field of efficient recovery of scattered tellurium from cuprous telluride slag, can solve the problems of incomplete tellurium separation, large consumption of reagents, low tellurium recovery rate, etc., and achieves enhanced tellurium selection The effect of leaching, reducing production cost and improving leaching rate

Active Publication Date: 2022-07-29
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of incomplete separation of copper and tellurium, low recovery rate of tellurium, long process flow and large consumption of reagents when the existing process is used to treat cuprous telluride slag for separation and recovery of tellurium and copper. The method for efficiently recovering scattered metal tellurium from cuprous telluride slag has the characteristics of high separation efficiency of copper and tellurium, simple process, and low reagent consumption, and can realize efficient comprehensive recovery of tellurium and copper in cuprous telluride slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for efficiently recovering scattered metal tellurium from cuprous telluride slag of the present embodiment specifically includes the following steps:

[0027] S1. Weigh an appropriate amount of NaOH solid and add it into water to prepare 1 L of alkaline solution with a concentration of 2 mol / L.

[0028] S2. The cuprous telluride powder is ball-milled to less than 300 μm in advance, and dried at 130° C. for 24 hours. 200 g of fully dried and ground cuprous telluride powder was added to the alkaline solution prepared in step S1, and then 6 g of NaClO oxidant was added to obtain a mixed slurry. The amount of NaClO oxidant added was 3% of the cuprous telluride slag powder.

[0029]S3, carry out oxygen pressure alkali leaching on the mixed slurry in step S2, feed oxygen into the autoclave, maintain the pressure at 0.4Mpa, the temperature is 110°C, the stirring speed is 250rpm, and the reaction time is 1h, so that tellurium is oxidized from -2 valence to Soluble +4-...

Embodiment 2

[0034] A method for efficiently recovering scattered metal tellurium from a cuprous telluride slag of the present embodiment is basically the same as in Embodiment 1, except that:

[0035] In S1, an appropriate amount of NaOH solid was weighed and added to water to prepare 1 L of alkaline solution with a concentration of 8 mol / L.

[0036] In S2, the cuprous telluride powder was ball-milled and then dried at 120°C for 48 hours. 100 g of cuprous telluride powder was added to the prepared alkaline solution, and then 8 g of NaClO was added. 3 Oxidizer, to obtain mixed slurry, NaClO 3 The amount of oxidant added is 8% of the raw material of cuprous telluride slag.

[0037] Oxygen was introduced into the autoclave in S3, the pressure was kept at 0.5Mpa, the temperature was 120°C, the stirring speed was 350rpm, and the reaction time was 2h, so that tellurium was oxidized from -2 valence to soluble +4 valence TeO 3 2- into the solution.

[0038] In S4, the solid-liquid mixed slurr...

Embodiment 3

[0042] A method for efficiently recovering scattered metal tellurium from a cuprous telluride slag of the present embodiment is basically the same as in Embodiment 1, except that:

[0043] In S1, NaOH solid was added to water to prepare 1 L of alkaline solution with a concentration of 4 mol / L.

[0044] In S2, the cuprous telluride powder was ball-milled and dried at 150°C for 48 hours. 200 g of cuprous telluride powder was added to the prepared alkaline solution, and then 10 g of NaClO oxidant was added to obtain a mixed slurry. The amount of NaClO oxidant added was tellurium 5% of cuprous slag powder.

[0045] In S3, oxygen was introduced into the autoclave, the pressure was maintained at 0.6Mpa, the temperature was 130°C, the stirring speed was 400rpm, and the reaction time was 2.5h, so that the tellurium was oxidized from -2 valence to soluble +4 valence TeO 3 2- into the solution.

[0046] The solid-liquid mixed slurry in S4 was subjected to solid-liquid separation at a...

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Abstract

The invention discloses a method for efficiently recovering scattered metal tellurium from cuprous telluride slag, which belongs to the field of non-ferrous metal metallurgy. The invention can effectively improve the tellurium leaching rate, reduce the pressure and temperature of the reaction system, and effectively suppress the generation of +6-valent tellurium by adding a chlorine-containing oxidant to the oxygen pressure alkaline leaching system, which is beneficial to further extracting the tellurium product and improving the tellurium The total recovery rate of the tellurium-containing leaching solution is directly electrolyzed, and the tellurium is reduced and precipitated at the cathode by accurately controlling the electrochemical conditions, and the precipitation of impurity ions is avoided to obtain a refined tellurium product. The invention adopts chlorine-containing oxidant assisted oxygen pressure alkali leaching combined with electrolysis process to separate and recover tellurium and copper from cuprous telluride slag, has the characteristics of high recovery rate of tellurium and copper, simple process, low cost and the like, and can realize cuprous telluride slag. The short-process efficient comprehensive recovery.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a method for efficiently recovering scattered metal tellurium from cuprous telluride slag. Background technique [0002] Tellurium is a rare element with both metallic and non-metallic properties. It is collectively referred to as "metalloids" together with elements such as boron and arsenic. Because of its excellent physical and chemical properties, tellurium has a wide range of applications in thin-film solar energy, thermoelectric materials, metallurgy, electronic appliances, petrochemicals, glass ceramics and other industries. At present, emerging industries are the most important application areas of tellurium, of which thermoelectric and photovoltaic uses account for more than two-thirds of total tellurium consumption. With the continuous advancement of society and technology, global tellurium consumption will continue to grow rapidly. [0003] There ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C25B1/01C25B1/50
CPCC22B7/008C22B15/008C25B1/01C25B1/50Y02P10/20
Inventor 徐亮赵卓张福元张楷姚东吴俊何锦东王玲徐猛猛
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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