Method for leaching tellurium in tellurium slag in co-oxidation mode

A technology for synergistic oxidation and leaching of slag, applied in the field of hydrometallurgy to realize synergistic leaching of tellurium slag and effective separation and enrichment of valuable metals, it can solve the problems of increasing the difficulty of separation and recovery of tellurium, poor effect, etc., and achieve easy industrial production and application , The effect of simple reaction conditions and large reduction yield

Active Publication Date: 2016-09-07
CENT SOUTH UNIV
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Problems solved by technology

[0003] The phases of tellurium in tellurium slag are different, and the methods adopted are different. When the phases of tellurium in tellurium slag are mainly tellurium dioxide and sodium tellurite, the method to be adopted is alkaline leaching method, which is not suitable for tellurium dioxide. The treatment effect of tellurium slag with high content of sodium tellurite is good, but for the tellurium slag containing sodium tellurate and telluride, the effect of this method is relatively poor
For the tellurium slag containing sodium tel

Method used

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Embodiment 1

[0033] A method for synergistic oxidation leaching of tellurium in tellurium slag of the present invention, its process flow chart is as follows figure 1 shown, including the following steps:

[0034] (1) prepare the sulfuric acid solution of 4.60mol / L, and add the sodium chloride of tellurium slag weight ratio 20%, be heated to 90 ℃, pass into ozone according to the flow rate of 1L / min, then according to liquid-solid ratio (solution volume L and The solid mass (Kg ratio) is 6:1, and the tellurium slag that is ground to 100% through a sieve with a pore size of 150 microns is added, and stirred and leached;

[0035] (2) Keep the stirring speed at 300r / min, and add the sulfuric acid volume 20% concentration by controlling the speed of constant flow pump 10r / min to carry out the synergistic oxidation reaction of 30% hydrogen peroxide, react for 5h, and use vacuum filtration after the reaction Realize liquid-solid separation, obtain leaching slag containing antimony and lead (see...

Embodiment 2

[0038] A method for synergistic oxidation leaching of tellurium in tellurium slag of the present invention, its process flow chart is as follows figure 1 shown, including the following steps:

[0039] (1) prepare the sulfuric acid solution of 3.68mol / L, and add the sodium chloride of tellurium slag weight ratio 25%, be heated to 85 ℃, pass into ozone according to 2L / min, then according to liquid-solid ratio (solution volume L and solid mass) Kg ratio) 7:1 is added to tellurium slag that is ground to 100% through a sieve with an aperture of 100 microns, stirred and leached;

[0040] (2) Keep stirring speed 300r / min, and add sulfuric acid volume 25% concentration by controlling the speed of constant flow pump 20r / min to be the carrying out of 30% hydrogen peroxide synergistic oxidation reaction, reaction time 7h, adopt vacuum filtration mode to realize after reaction The liquid and solid are separated to obtain leaching slag containing antimony and lead and leaching solution co...

Embodiment 3

[0043] A method for synergistic oxidation leaching of tellurium in tellurium slag of the present invention, its process flow chart is as follows figure 1 shown, including the following steps:

[0044] (1) prepare the sulfuric acid solution of 2.76mol / L, and add the sodium chloride of tellurium slag weight ratio 30%, be heated to 80 ℃, pass into ozone according to the flow rate of 2L / min, press liquid-solid ratio (solution volume L and solid mass Kg ratio) 8:1, add tellurium slag that is ground to 100% and pass through a sieve with a pore size of 75 microns, and stir for leaching;

[0045] (2) Keep the stirring speed at 300r / min, and add 30% concentration of sulfuric acid volume by controlling the speed of constant flow pump 15r / min to carry out the coordinated oxidation reaction of hydrogen peroxide with a concentration of 30%. The reaction time is 8h, and the vacuum filtration method is adopted after the reaction Liquid-solid separation is realized to obtain leaching slag co...

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Abstract

The invention discloses a method for leaching tellurium in tellurium slag in a co-oxidation mode. The method comprises the following steps that 1, sodium chloride is added into a sulfuric acid solution and heated to 60 DEG C-90 DEG C, heat preservation is conducted, then, ozone is introduced, the tellurium slag is added, and stirring is conducted; and 2, under the condition that stirring is kept, hydrogen peroxide is introduced into the solution processed in the step 1, the solution and the ozone are subjected to oxidizing leaching in a synergetic mode, and solid-liquid separation is conducted after reaction lasts for 2-8 h, so that leaching slag and leaching liquid containing the tellurium are obtained. According to the method for leaching the tellurium in the tellurium slag in the co-oxidation mode, hydroxyl radicals very high in oxidizing capacity are produced under an O3/H2O2 system; the stable structure of lead telluride and the stable structure of bismuthic acid copper are opened through the high oxidizing property of the hydroxyl radicals, so that the tellurium, bismuth and copper are exposed; the chlorine benignity characteristic of the tellurium and the bismuth is utilized, so that the leaching effect of the tellurium, the bismuth and the copper in the tellurium slag is good, the leaching rate of the tellurium reaches 99%, the leaching rate of the bismuth reaches 96%, and the leaching rate of the copper reaches 99%; and accordingly, the tellurium in the complex tellurium slag is efficiently and directly leached, and step-by-step recycling of the tellurium, the bismuth, the copper and antimony is facilitated.

Description

technical field [0001] The invention relates to a method for synergistically oxidizing and leaching tellurium in tellurium slag, in particular to a hydrometallurgical method for realizing synergistic leaching of tellurium slag and effective separation and enrichment of valuable metals. Background technique [0002] Tellurium is an important scattered metal. Due to its special physical and chemical properties, it is widely used in many fields such as metallurgy, chemical industry, petroleum, electronics, electrical, glass ceramics, pigments and medicine, especially telluride has high thermoelectric potential And good photoelectric conversion performance, making the development of tellurium in semiconductor refrigeration parts and solar energy particularly rapid. At present, tellurium is mainly recovered from copper concentrate and lead concentrate. After the copper concentrate or lead concentrate is treated by pyro-smelting electrolytic refining process, tellurium is enriched...

Claims

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Application Information

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IPC IPC(8): C22B7/04C01B19/02
CPCC01B19/02C01P2002/72C22B7/007C22B7/04Y02P10/20
Inventor 郭学益许志鹏李栋田庆华
Owner CENT SOUTH UNIV
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