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A method for enriching and recovering tellurium dioxide from tellurium-containing soda slag

A technology of tellurium dioxide and soda slag, which is applied in the field of separation chemistry, can solve problems such as low product purity, low yield, and complicated operations, and achieve the effects of increasing tellurium leaching rate, strong fine grinding force, and shortening leaching time

Active Publication Date: 2016-09-21
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, although the process of extracting tellurium by alkaline hydrometallurgy is mature, there are problems such as complicated operations, low yield, and low product purity. It is necessary to choose a scientific process route, efficient leaching agent, suitable replacement agent and Reducing agent to maximize tellurium recovery rate and tellurium dioxide purity to solve tellurium recovery process in materials with low tellurium content

Method used

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  • A method for enriching and recovering tellurium dioxide from tellurium-containing soda slag
  • A method for enriching and recovering tellurium dioxide from tellurium-containing soda slag
  • A method for enriching and recovering tellurium dioxide from tellurium-containing soda slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Raw material: tellurium-containing soda slag; elemental analysis shows that the raw material contains Te 13.38%, Sb 4.51%, Cu 2.55%, Bi 3.24%, Pb 2.61%, Se 1.52%, As 0.06%, Zn 0.37%.

[0027] Leaching agent: prepared by mixing 40 parts of sodium hydroxide, 40 parts of quicklime, 20 parts of sodium sulfide and 0.1 part of sodium polyacrylate.

[0028] In a 5L vertical spiral agitation mill, add 200g of tellurium-containing soda slag with a particle size of less than 5mm, 1000ml of water at 95°C, and 60g of the above-mentioned leaching agent in sequence, and turn on the vertical spiral agitation mill for fine grinding, stirring and leaching Work; pour out the reacted slurry after 30 minutes, vacuum filter and wash to obtain 1500ml of tellurium leaching solution; add sulfuric acid solution to the filtered tellurium leaching solution to neutralize the solution so that the pH value of the solution reaches 3-5, then filter and wash 1. Dry the precipitate to obtain 28.85 g of ...

Embodiment 2

[0033] Raw material: tellurium-containing soda slag; elemental analysis shows that the raw material contains Te 13.38%, Sb 4.51%, Cu 2.55%, Bi 3.24%, Pb 2.61%, Se 1.52%, As 0.06%, Zn 0.37%.

[0034] Leaching agent: The leaching agent is prepared by mixing 45 parts of sodium hydroxide, 40 parts of quicklime, 15 parts of sodium sulfide and 0.5 part of sodium polyacrylate.

[0035] In a 5L vertical spiral agitation mill, add 200g of tellurium-containing soda slag with a particle size of less than 5mm, 1000ml of water at 95°C, and 40g of the above-mentioned leaching agent in sequence, and turn on the vertical spiral agitation mill for fine grinding, stirring and leaching Work; pour out the reacted slurry after 30 minutes, vacuum filter and wash to obtain 1500ml of tellurium leaching solution; add sulfuric acid solution to the filtered tellurium leaching solution to neutralize the solution so that the pH value of the solution reaches 3-5, then filter and wash 1. Dry the precipitate...

Embodiment 3

[0040] Raw material: tellurium-containing soda slag; elemental analysis shows that the raw material contains Te 13.38%, Sb 4.51%, Cu 2.55%, Bi 3.24%, Pb 2.61%, Se 1.52%, As 0.06%, Zn 0.37%.

[0041] Leaching agent: Take 50 parts of sodium hydroxide, 40 parts of quicklime, 10 parts of sodium sulfide, and 0.3 part of sodium polyacrylate, and mix them uniformly to prepare the leaching agent.

[0042]In a 5L vertical spiral agitation mill, add 200g of tellurium-containing soda slag with a particle size of less than 5mm, 1000ml of water at 95°C, and 30g of the above-mentioned leaching agent in sequence, and turn on the vertical spiral agitation mill for fine grinding, stirring and leaching Work; pour out the reacted slurry after 30 minutes, vacuum filter and wash to obtain 1500ml of tellurium leaching solution; add sulfuric acid solution to the filtered tellurium leaching solution to neutralize the solution so that the pH value of the solution reaches 3-5, then filter and wash 1. D...

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Abstract

The invention belongs to the field of separation chemistry, and relates to a method for enriching and recovering tellurium dioxide from tellurium-containing soda slag. The method comprises the steps of mixing crushed tellurium-containing soda slag and water in mass ratio of 1: (1-5) and then adding to a grinding-leaching mill; adding a leaching agent which is 10-30% of the mass of the tellurium-containing soda slag to the grinding-leaching mill; starting the grinding-leaching mill for fine grinding, agitating and leaching for 10-30min; discharging the reacted slurry; filtering and washing to obtain a tellurium leaching solution; adding an H2SO4 solution to the tellurium leaching solution to neutralize until pH is 3-5; filtering, washing and drying to obtain a product; starting the grinding-leaching mill to operate for 20-30min; filtering and separating out a leaching solution; adding 20-60% of sulfuric acid solution to the obtained filtrate to neutralize until pH is 3-5; separating out a precipitate; then filtering, washing and drying to obtain crude tellurium dioxide. The method has the characteristics of being short in tellurium leaching time, high in tellurium leaching rate, and less in content of other metal impurities in the leaching solution.

Description

technical field [0001] The invention belongs to the field of separation chemistry and relates to a method for enriching and recovering tellurium dioxide from tellurium-containing soda slag. Background technique [0002] Tellurium is a kind of scattered metal, which is mainly used in metallurgy and electronics industry. Using a small amount of tellurium as an additive can significantly improve the properties of steel and non-ferrous metals, such as strength, hardness, machinability, grain refinement, electrical conductivity, thermal conductivity, Fatigue resistance, corrosion resistance, etc.; the raw materials for tellurium recovery mainly come from anode slime obtained by electrolytic refining of ore copper, and its content is usually 1%-10%. Tellurium fume and tellurium alloy product waste residue and refrigeration waste, etc. [0003] Tellurium dioxide is an important compound used to extract metal tellurium by electrowinning, and tellurium-containing soda slag is a kind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
CPCC01B19/04
Inventor 王永斌梁富民周俊涛栗威黄建芬吴斌余江鸿
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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