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Method for reextracting tellurium by using alkali liquor

A technology of lye and immersion solution, applied in chemical instruments and methods, preparation of selenium/tellurium, selenium/tellurium compounds, etc., can solve the problem of low utilization rate of raw materials, achieve novel process, high utilization rate of raw materials, and guaranteed yield and the effect of purity

Pending Publication Date: 2018-07-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: when the method in the prior art is applied to the extraction of tellurium in tellurium ore, there is a problem that the utilization rate of raw materials is not high. Methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for back-extracting tellurium with lye, comprising: taking 50.01 g of hydrochloric acid immersion solution after removing iron, adding 46.27 g of TBP with a volume fraction of 60%, separating the oil phase after extraction, and adding 31.01 g of 2mol / L potassium hydroxide , to obtain the product potassium tellurite, heating and drying at 100°C. After testing, the product contains tellurium with a yield of 91.37% and a purity of 98.71%.

Embodiment 2

[0025] A method for back-extracting tellurium with lye, comprising: taking 49.98 g of hydrochloric acid immersion solution after iron removal, adding 45.02 g of TBP with a volume fraction of 60%, separating the oil phase after extraction, and adding 30.10 g of 2mol / L sodium hydroxide , to obtain the product sodium tellurite, heating and drying at 100°C. After testing, the yield of the product sodium tellurite is 92.16%, and the purity reaches 98.65%.

Embodiment 3

[0027] A method for back-extracting tellurium with lye, comprising: taking 50.00 g of hydrochloric acid immersion solution after iron removal, adding 45.09 g of TBP with a volume fraction of 60%, separating the oil phase after extraction, adding 29.33 g of 2mol / L ammonia solution, The ammonium tellurite product obtained was heated and dried at 100°C. After testing, the yield of the product tellurium dioxide is 93.26%, and the purity reaches 98.05%.

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Abstract

The invention discloses a method for reextracting tellurium by using an alkali. The problem that the utilization rate of a raw material is low when a method in the prior art is applied to the tellurium extraction in tellurium ore is solved. The method comprises the following steps of (1), obtaining iron removed hydrochloric acid immersion liquor; (2), adding TBP (Tributyl Phosphate) with the volume fraction of 55 to 65 percent into the hydrochloric acid immersion liquor, extracting, and separating out an oil phase; (3), adding a sodium hydroxide solution with the concentration of 1.5mol / L to 2.5mol / L into the oil phase, and reextracting, so as to obtain a tellurium-containing product; (4), drying the tellurium-containing product to subsequently obtain a finished product. The method has theadvantages that the process route is relatively simple, the utilization rate of the raw material is high, the purity reaches 98 percent or above, the yield reaches 90 percent or above and the like.

Description

technical field [0001] The invention relates to the field of separation and purification, in particular to a method for back-extracting tellurium with lye. Background technique [0002] Tellurium is a rare and dispersed metal with a very low content in the earth's crust. There are few independent deposits of tellurium, and most of it is associated with copper, lead, gold and silver minerals, or occurs in other sulfide minerals in the form of impurities . In the field of metallurgy, tellurium can enhance the machinability of steel and improve the yield of stainless steel and low carbon steel. Tellurium can enhance the thermal shock resistance and mechanical vibration resistance of iron, and improve its acid corrosion resistance and fatigue resistance. This tellurium-treated steel is already used in mines, automation, railroads and other equipment. In the petrochemical field, tellurium is used as a catalyst and vulcanizing agent for rubber synthesis, which can improve the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01B19/04
CPCC01B19/001C01B19/004C01B19/008C01P2006/80
Inventor 周堃龙剑平王珂谢刚向东妮
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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