Method for recycling tellurium from tellurium mould residue

A casting mold and powder technology, which is applied in the field of non-ferrous metal recycling, can solve the problems of high impurities in tellurium-containing leaching solution, high consumption of chemical agents, unqualified tellurium products, etc., and achieve the effect of less impurities, low equipment requirements, and small equipment corrosion

Inactive Publication Date: 2018-11-16
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many steps in this method and the process is long, especially because of the stability of the chemical properties of the tellurium element, the oxidation rate of the tellurium element is extremely slow or even not oxidized when the oxidant (hydrogen peroxide) is added under the condition of inorganic acid (hydrochloric acid), and the obtained tellurium-containing There are many impurities in the leaching solution, and the removal of impurities is complicated. Therefore, this method has problems such as slow reaction speed, long cycle and incomplete removal of impurities, which may easily lead to unqualified tellurium products, consume a lot of chemicals, and high cost.

Method used

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  • Method for recycling tellurium from tellurium mould residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 2000g of tellurium casting slag (Te 73.18%, Pb 0.64%, Ag 0.055%) is crushed, ground into a tellurium casting slag powder with a particle size of 120 mesh, the tellurium casting slag powder is placed in a reaction tank, and then poured into the reaction tank Add 6L of sodium hydroxide solution with a concentration of 160g / L and mix evenly, add 4L of hydrogen peroxide with a mass percentage of 30% at a rate of 10ml / min at 85°C, and keep stirring to carry out the oxidation leaching reaction. The stirring speed is 500r / min, after 2 hours of reaction, liquid-solid separation is carried out to obtain tellurium-containing leaching solution and leaching slag. After washing and sampling, the leaching slag is returned to the lead smelting system to recover Ag and Pb valuable metals; the tellurium-containing leaching solution is directly returned to the electrowinning process to recover metal tellurium. Sampling analysis shows that the recovery rate of tellurium in tellurium castin...

Embodiment 2

[0037]2000g of tellurium casting slag (Te75.00%; Pb0.81%; Ag0.049%) is crushed, ground into tellurium casting slag powder with a particle size of 100 mesh, the tellurium casting slag powder is placed in a reaction tank, and then Add 8L of sodium hydroxide solution with a concentration of 150g / L to the reaction tank and mix evenly, add 5L of hydrogen peroxide with a mass percentage of 30% at a rate of 10ml / min at 80°C, and keep stirring to carry out the oxidation leaching reaction. The speed is 600r / min. After 3 hours of reaction, liquid-solid separation is carried out to obtain tellurium-containing leaching solution and leaching slag. After washing and sampling, the leaching slag is returned to the lead smelting system to recover Ag and Pb valuable metals; the tellurium-containing leaching solution is directly returned to the electrowinning process to recover metals. tellurium. Sampling analysis showed that the recovery rate of tellurium in tellurium casting slag was as high a...

Embodiment 3

[0039] 2000g of tellurium casting slag (Te70.00%; Pb0.89%; Ag0.076%) is crushed, ground into tellurium casting slag powder with a particle size of 120 meshes, the tellurium casting slag powder is placed in a reaction tank, and then Add 10L of sodium hydroxide solution with a concentration of 160g / L into the reaction tank and mix evenly, add 5L of hydrogen peroxide with a mass percentage of 30% at a rate of 10ml / min at 75°C, and keep stirring to carry out the oxidation leaching reaction. The speed is 800r / min. After 4 hours of reaction, liquid-solid separation is carried out to obtain tellurium-containing leaching solution and leaching slag. After washing and sampling, the leaching slag is returned to the lead smelting system to recover Ag and Pb valuable metals; the tellurium-containing leaching solution is directly returned to the electrowinning process to recover metals tellurium. Sampling and analysis show that the recovery rate of tellurium in tellurium casting slag is as ...

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Abstract

The invention discloses a method for recycling tellurium from tellurium moulding residue. The method comprises the following steps: breaking the tellurium mould residue and grinding into tellurium mould residue powder; adding the tellurium mould residue powder into sodium hydroxide, and mixing uniformly; dropwise adding hydrogen peroxide at 70-85 DEG C; continuously stirring for an oxidizing leaching reaction; after complete reaction, performing liquid-solid separation to obtain tellurium-containing leachate and tellurium-containing leaching residue; directly returning the tellurium-containingleachate to an electrodeposition process, and recycling metal tellurium. According to the method disclosed by the invention, the oxidizing leaching is performed by using sodium hydroxide and hydrogenperoxide, the tellurium-containing leachate and tellurium-containing leaching residue are obtained in one step, and neutralization or calcination for purification is not required in later period; theproduction technology is simple, the leachate contains few impurities, thus the leaching rate of tellurium is greatly increased, and the problem of the prior art that the oxidizing speed of the tellurium element is very low or even the tellurium element is not oxidized after an oxidizing agent is added when inorganic acid is applied is solved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recovery, in particular to a method for recovering tellurium from tellurium casting slag. Background technique [0002] In the late casting stage of tellurium smelting, a kind of scum with high tellurium content will be produced, and most of the tellurium exists in the form of metal tellurium, and it also contains some valuable elements such as lead, silver and antimony. We call it tellurium slag. Most enterprises usually return the slag directly to the tellurium slag-making stage in the later stage of the silver smelting oxidation refining process for enrichment and recovery. The recovery rate of metal tellurium in the process is extremely low, which not only causes problems such as waste of raw materials and low recovery rate, but also has disadvantages such as long process, high production cost, poor operating conditions and poor economic benefits. [0003] Patent application number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/00C22B13/00C25B1/00
CPCC22B7/008C22B7/04C22B11/044C22B13/045C25B1/00Y02P10/20
Inventor 蒋朝金黄前军谢兆凤许孔玉许军王强
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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