A method for selectively separating and recovering tellurium from tellurium-containing materials

A technology of separation recovery and selectivity, which is applied in the field of metallurgy, can solve the problems of long recovery period, long process flow, lengthy and complicated process, etc., and achieve the effect of high selectivity, good separation effect and high product purity

Active Publication Date: 2017-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tellurium-containing smelting slag is oxidized and leached with inorganic acid, copper plate replaces precious metal, sodium sulfide precipitates copper, neutralizes and precipitates tellurium, crude TeO 2 Alkaline leaching, Na 2 S removal, concentration, and electrowinning to prepare refined tellurium, but the process of extracting refined tellurium from tellurium-containing smelting slag is long, lengthy and complicated, and the recovery period is long

Method used

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  • A method for selectively separating and recovering tellurium from tellurium-containing materials
  • A method for selectively separating and recovering tellurium from tellurium-containing materials
  • A method for selectively separating and recovering tellurium from tellurium-containing materials

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Embodiment 1

[0041] A method for selective separation and recovery of tellurium of the present invention, its process flow diagram is as follows figure 2 shown, including the following steps:

[0042](1) Grinding the tellurium-containing material with the chemical composition shown in Table 1 to 100% through a sieve with a pore size of 75um to 150um, then adding the sieved tellurium-containing material into the prepared 50g / L sodium sulfide solution (sulfurization The volume of the sodium solution and the mass ratio of the tellurium-containing material are 8L / Kg), stirring and leaching, the temperature during the leaching process is 30 ° C, and the leaching time is 4 hours. Slag (see its XRD pattern image 3 ), the leach slag is recovered by traditional reduction smelting to recover antimony, bismuth and lead;

[0043] (2) Add the leaching solution after step (1) into the circulating electrolytic cell for swirl electrolysis, control the circulating flow rate to 300L / h, and the current d...

Embodiment 2

[0047] A method for selective separation and recovery of tellurium of the present invention, its process flow diagram is as follows figure 2 shown, including the following steps:

[0048] (1) Grinding the tellurium-containing material with the chemical composition as shown in Table 1 to 100% through a sieve with a pore size of 75um to 150um, and then adding the sieved tellurium-containing material into the prepared 30g / L sodium sulfide solution (sulfurization The volume of the sodium solution and the mass ratio of the tellurium-containing material are 5L / Kg), stirring and leaching, the temperature during the leaching process is 60 ° C, and the leaching time is 3 hours. Slag, leaching slag using traditional reduction smelting to recover antimony, bismuth and lead;

[0049] (2) Add the leaching solution after step (1) into the circulating electrolytic cell for swirl electrolysis, control the circulating flow rate to 400L / h, and the current density to 40A / m 2 ; During the elec...

Embodiment 3

[0053] A method for selective separation and recovery of tellurium of the present invention, its process flow diagram is as follows figure 2 shown, including the following steps:

[0054] (1) Grinding the tellurium-containing material with the chemical composition shown in Table 1 to 100% through a sieve with a pore size of 75um to 150um, and then adding the sieved tellurium-containing material into the prepared 20g / L sodium sulfide solution (sulfurization The volume of the sodium solution and the mass ratio of the tellurium-containing material are 3.5L / Kg), stirring and leaching, the temperature in the leaching process is 70°C, and the leaching time is 1h. After the leaching is completed, vacuum filtration is used to separate the liquid from the solid, and the leachate and Leaching slag, using traditional reduction smelting to recover antimony, bismuth and lead;

[0055] (2) Add the leaching solution after step (1) into the circulating electrolytic cell for swirl electrolys...

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Abstract

A method for selectively separating and recycling tellurium from tellurium-containing materials includes the following steps that firstly, the tellurium-containing materials are added into a sodium sulfide solution, stirred, leached and then filtered to obtain a leaching solution and leaching residues; secondly, the leaching solution obtained after the first step is subjected to swirl electrolysis in a circulating electrolytic cell, and a cathode product is taken out after swirl electrolysis is finished; thirdly, the cathode product obtained after the second step is sequentially subjected to boiling with an oxalic acid solution, water washing and drying to obtain high-purity tellurium, wherein the purity reaches 99.9% or above. The tellurium-containing materials are processed by means of the sodium sulfide solution, tellurium in the tellurium-containing materials can be further selectively separated out, antimony, bismuth, lead and other metal are enriched in the leaching residues, and the separation effect is good.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for selectively separating and recovering tellurium from tellurium-containing materials. Background technique [0002] Tellurium is a rare element and is widely used as an alloy additive in the metallurgical industry, as a catalyst and vulcanizing agent in the petrochemical industry, as an important raw material for semiconductors and optical devices in the electronics and electrical industries, and as a supporting material for contemporary high-tech new materials. Because of its important position in the modern high-tech industry, national defense and cutting-edge technology fields, tellurium has been paid more and more attention by people, and its application range has become wider and wider, and its influence on the development of the national economy has become greater and greater. [0003] At present, tellurium is mainly recovered from copper concentrate and lead concentra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00
CPCC25B1/00
Inventor 郭学益许志鹏田庆华李栋
Owner CENT SOUTH UNIV
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