Method for extracting germanium from lignite by pyrogenic process

A lignite and pyrotechnic technology, applied in the field of non-ferrous rare metal extraction, can solve the problems of low grade of germanium soot, poor acid solubility and low recovery rate of germanium

Inactive Publication Date: 2009-04-22
JIUJIANG BAIDUN VANADIUM TECH TRADING
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  • Abstract
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Problems solved by technology

[0002] Lignite, one of the raw materials for extracting germanium by fire method, generally has a germanium content of 30ppm to 200ppm. When using traditional blast furnace smelting, chain furnace with transmission grate, and manual furnace with fixed grate to extract germanium, when The calorific value of germanium-containing lignite is too low. If it is in the range of 8360-14630kj/kg, if such equipment is used for smelting and extracting germanium, th

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  • Method for extracting germanium from lignite by pyrogenic process

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Embodiment 1

[0024] Use lignite containing 248ppm germanium and a calorific value of 11077kj / kg, process 80 tons per day, crush and sieve to 5mm, mix well, and mix high-quality lignite according to the proportion of ash not higher than 55% (mass fraction). and low-quality lignite for batching, and then transported by belt to the vertical kiln for combustion and volatilization, adjust the size of the blast and air damper to the best germanium volatilization conditions, even if the oxygen content in the air flow above the coal seam in the furnace is a mass percentage 3%, so that lignite is burned in a reducing atmosphere with insufficient oxygen supply to ensure sufficient carbon and carbon monoxide. Germanium is reduced by carbon and carbon monoxide at a high temperature of 1150 ° C to form germanium monoxide. Germanium monoxide is at this temperature Volatilizes and escapes, enters the flue gas pipe with the volatilization of the furnace gas, and is oxidized by the oxygen in the air at a hi...

Embodiment 2

[0026] Use lignite containing 462ppm germanium and a calorific value of 12600kj / kg, process 80 tons per day, crush and sieve to 5mm, mix well, and mix high-quality lignite according to the proportion of ash not higher than 55% (mass fraction). and low-quality lignite for batching, and then transported by belt to the vertical kiln for combustion and volatilization. Adjust the size of the blast and induced air dampers to the best volatilization conditions for germanium, even if the oxygen content in the air flow above the coal seam in the furnace is a mass percentage 5%, so that lignite is burned in a reducing atmosphere with insufficient oxygen supply to ensure sufficient carbon and carbon monoxide. Germanium is reduced by carbon and carbon monoxide at a high temperature of 1250 ° C to form germanium monoxide, which enters with the volatilization of furnace gas In the flue gas pipe, it is oxidized to germanium dioxide by the oxygen in the air at a high temperature of 500-1200 ° ...

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Abstract

The invention provides a method for extracting germanium from lignite through a pyrogenic process. The method is characterized in that germanium-containing lignite volatilizes germanium in a pyrogenic-process smelting procedure of a vertical kiln; a control condition of volatilizing germanium is that the temperature is between 1,150 and 1,250 DEG C; in a suitable reducing atmosphere, the germanium existing as germanium dioxide generates germanium monoxide after reduction reaction through carbon particles and carbon monoxide; a suitable oxidizing atmosphere ensures that the germanium monoxide follows dust particles volatilized simultaneously to meet excessive oxygen in a flue gas tube and then is oxidized to be the germanium dioxide; the temperature of the germanium dioxide is lowered through a cooler; the generated germanium dioxide is changed into a solid state and is attached to the surfaces of the dust particles; the germanium-enriched dust particles pass an electrostatic dust catcher and then are attached to the electrostatic dust catcher; and germanium-enriched electrostatic dust is collected so as to obtain germanium concentrate. The method is advanced in technology, economical, practical and low in cost for extracting germanium. Compared with a chain-boiler germanium extracting process and other germanium extracting methods, the method has the advantages that the method is high in germanium volatilizing efficiency, the direct recovery rate of the electrostatic dust, the germanium-containing grade of the electrostatic dust and the post wet treatment yield of the output electrostatic dust, and is convenient for subsequent processing, and the like.

Description

technical field [0001] The invention belongs to the technical field of extraction of nonferrous and rare metals, in particular to a method for extracting germanium from lignite by fire method. Background technique [0002] Lignite, one of the raw materials for extracting germanium by fire method, generally has a germanium content of 30ppm to 200ppm. When using traditional blast furnace smelting, chain furnace with transmission grate, and manual furnace with fixed grate to extract germanium, when The calorific value of germanium-containing lignite is too low. If it is in the range of 8360-14630kj / kg, if such equipment is used for smelting and extracting germanium, the temperature in the furnace is difficult to exceed 1100 °C, and the volatilization rate of germanium is low. The low grade of soot and the low efficiency of bag dust removal have resulted in a low recovery rate of germanium, and the produced germanium soot has not been subjected to the process of decarburization ...

Claims

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Application Information

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IPC IPC(8): C22B41/00
Inventor 葛启明李巴克
Owner JIUJIANG BAIDUN VANADIUM TECH TRADING
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