Process method for refining crude tellurium

A process method and crude tellurium technology, applied in the field of metallurgy, can solve the problems of high production cost, high operation intensity, long production cycle, etc., and achieve the effects of avoiding the alkali leaching process, overcoming the difficulty of removing impurities, and avoiding excessively high impurities

Pending Publication Date: 2020-05-29
DAYE NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a crude tellurium refining process for the above-mentioned problems in the current tellurium refining process. , Oxidative acid leaching slag direct liquid production, purification, purified liquid electrowinning, tellurium flake washing, casting, avoiding too long production cycle of tellurium, high system occupation, overcoming high production cost, high operation intensity, separation of tellurium and impurities A series of problems such as incompleteness, the present invention can obtain tellurium ingots with a purity higher than 99.99%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of crude tellurium refining process of the present embodiment comprises the following steps:

[0032] (1) Pickling: Weigh 1.1t of coarse tellurium powder containing 68.25% tellurium, and add 9m 3 Slurry with pure water, then add 400L of industrial hydrochloric acid with a mass fraction ≥ 36%, heat the slurry to 75°C, stir at a constant temperature for 2 hours, and press filter. The filter residue is pickling residue containing 95.15% tellurium, and the filtrate is retained for use;

[0033] (2) Oxidative acid leaching: 6.5m into the pickling slag 3 Slurry with pure water, then add 200L of industrial sulfuric acid with a mass fraction ≥ 98%, heat the slurry to 60°C, and slowly add 425kg of sodium chlorate into the slurry while stirring (the sodium chlorate is divided Add 17 times, each addition is 25kg, and each time is 10 minutes), control the solution potential at 250mV, stir at constant temperature for 5 hours and press filter, the filter residue is 73.22% oxi...

Embodiment 2

[0045] A kind of crude tellurium refining process of the present embodiment comprises the following steps:

[0046] (1) Pickling: Weigh 1t of coarse tellurium powder containing 69.14% tellurium, and add 8m 3 Slurry with pure water, then add 350L of industrial hydrochloric acid with a mass fraction ≥ 36%, heat the slurry to 80°C, stir at a constant temperature for 2.5 hours, and press filter. The filter residue is pickling residue containing 96.63% tellurium, and the filtrate is retained for use;

[0047] (2) Oxidative acid leaching: 6m into the pickling slag 3 Slurry with pure water, then add 180L of industrial sulfuric acid with a mass fraction ≥ 98%, heat the slurry to 65°C, and slowly add 375kg of sodium chlorate into the slurry while stirring (the sodium chlorate is divided 15 additions, each addition is 25kg, each time 10min), control the solution potential at 280mV, stir at constant temperature for 6h and press filter, the filter residue is 74.52% oxidative acid leachin...

Embodiment 3

[0058] A kind of crude tellurium refining process of the present embodiment comprises the following steps:

[0059] (1) Pickling: Weigh 1.18t of coarse tellurium powder containing 65.48% tellurium, and add 9.5m 3 Slurry the steam condensed water, then add 450L of hydrochloric acid with a mass fraction ≥ 36%, heat the slurry to 85°C, stir at a constant temperature for 3 hours, and press filter. The filter residue is pickling residue containing 95.13% tellurium, and the filtrate is retained for use;

[0060] (2) Oxidative acid leaching: 7m into the pickling slag 3 Slurry with steam condensed water, then add 210L of sulfuric acid with a mass fraction ≥ 98%, heat the slurry to 70°C, slowly add 425kg of sodium chlorate to the slurry while stirring (the sodium chlorate is divided 17 additions, each addition is 25kg, and each time is 10 minutes), the solution potential is controlled at 300mV, stirred at a constant temperature for 7 hours and then press-filtered, the filter residue i...

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PUM

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Abstract

The invention discloses a process method for refining crude tellurium. The method is a tellurium refining process method comprising the steps of crude tellurium powder acid pickling, potential-controlled oxidation acid leaching, oxidation acid leaching residue washing, crude tellurium dioxide liquid making, electrodeposition liquid preparation through purification, electrodeposition, tellurium sheet boiling and washing, drying and casting. The method is simple and convenient to operate, cost is low, and technological process is simple, requirements on equipment are low, the recovery rate of tellurium in the whole technological process is high, the problems that a traditional tellurium refining technology is too long in production period and high in system occupation are avoided, a series of problems that the production cost is high, the operation intensity is high, tellurium and impurities are not separated thoroughly are solved, tellurium ingots with the purity higher than 99.99% canbe prepared through the method, and the method is suitable for wide application and popularization.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a process for refining crude tellurium. Background technique [0002] At present, the main process methods of tellurium refining are direct oxidative acid leaching of crude tellurium powder, primary alkaline leaching, secondary alkaline leaching, primary alkaline leaching liquid purification, purification liquid neutralization, crude tellurium dioxide washing, crude tellurium dioxide calcination, crude Tellurium dioxide liquid making, repurification, clarification and filtration of purified liquid, electrowinning of filtered liquid, and casting of tellurium sheets. However, this method has great limitations, mainly in the following aspects: (1) Coarse tellurium powder contains many impurities, such as selenium, copper, lead, bismuth, arsenic, silicon, etc., and the content of tellurium is unstable; (2) The process is very long and complicated; (3) The oxidative acid leaching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02C25B1/00
CPCC01B19/02C25B1/00
Inventor 房孟钊李伟宁瑞高友元余珊王亚东黄向祥
Owner DAYE NONFERROUS METALS
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