Method for enriching germanium from lignite flue dust

A soot and lignite technology, applied in the field of non-ferrous and rare metal extraction, can solve the problems of unfavorable direct reduction, volatilization and enrichment, etc., and achieve the effect of reducing equipment scale, reducing acid consumption, and reducing investment costs

Inactive Publication Date: 2016-08-31
CHINA ENFI ENGINEERING CORPORATION
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Problems solved by technology

This will not be conducive to the direct reduction volatilization enrichment of germanium at lower temperature

Method used

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  • Method for enriching germanium from lignite flue dust

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Embodiment approach

[0015] According to a typical embodiment of the present invention, a method for enriching germanium from lignite dust is provided. The method comprises the following steps: S1, mixing lignite dust with pulverized coal and lime, and then granulating to obtain material granules; S2, putting the material granules into a heating furnace, controlling the heating furnace to be a reducing atmosphere, and the temperature is 1200-1500°C , reduced and volatilized for 2 to 18 hours, and collected dust to obtain germanium-enriched material.

[0016] Among them, the main function of pulverized coal is to use the heat released by pulverized coal combustion and the carbon monoxide produced as reducing gas. By adjusting the proportion of pulverized coal, it can be controlled to a weak reducing atmosphere to avoid the reduction of germanium dioxide in germanium fume to metal. germanium. The addition of lime mainly plays the role of adjusting the slag type and reducing the slag temperature.

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Embodiment 1

[0024] refer to figure 1 The process uses germanium-containing fumes as raw materials, and the main component is SiO 2 35%, Fe15%, Al 2 o 3 12%, CaO12%, Ge0.8%, mixed with pulverized coal and lime according to the mass ratio of 1:0.5:0.15, crushed and sieved, the particle size is controlled to 50 mesh, and then pelletized with a disc granulator to obtain the diameter 15mm balls are sent into the closed electric furnace, the temperature is controlled at 1200°C, and the temperature is maintained for 4 hours. During this period, the stirring of the molten pool is strengthened. The dust contains 5.1% Ge, the germanium enrichment ratio is 6 times, and the recovery rate is 92%.

Embodiment 2

[0026] Using germanium-containing fumes as raw materials, the main component is SiO 2 35%, Fe15%, Al 2 o 3 12%, CaO12%, Ge1%, mixed with pulverized coal and lime according to the mass ratio of 1:0.2:0.1, crushed and sieved, the particle size is controlled to 50 mesh, and then pelletized with a disc granulator to obtain a diameter of 15mm The small balls are sent into the closed electric furnace, the temperature is controlled at 1350 °C, and the temperature is maintained for 4 hours. During this period, the stirring of the molten pool is strengthened. The content of Ge is 4.1%, the enrichment ratio of germanium is 4.1 times, and the recovery rate is 90.5%.

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Abstract

The invention discloses a method for enriching germanium from lignite flue dust. The method comprises the following steps: 1, mixing lignite flue dust with coal powder and lime, and granulating the obtained mixture to obtain material particles; and 2, putting the material particles in a heating furnace, carrying out reducing volatilization at 1200-1500DEG C in reducing atmosphere in the heating furnace for 2-18h, and collecting dusts to obtain a germanium-rich material. The method greatly reduces the acid consumption in the subsequent wet treatment process of germanium concentrate, avoids discharge and treatment of a large amount of wastewater and waste residues, reduces the device size, and reduces the investment cost.

Description

technical field [0001] The invention relates to the technical field of extraction of nonferrous and rare metals, in particular to a method for enriching germanium from lignite dust. Background technique [0002] Germanium, as a rare metal, is widely used in semiconductors, electronics and optical devices. However, as the use of germanium continues to increase, germanium resources are very scarce worldwide. [0003] Germanium metal has no separate mineral deposits in nature, and is mainly associated with germanium-bearing lignite and sphalerite. At present, the recovery of germanium from germanium-containing lignite in my country mainly adopts the vortex furnace process of enhanced combustion and volatilization, which enriches germanium in the soot, and then further extracts germanium from the soot. The extraction of germanium from germanium-containing fumes mostly adopts the chlorination distillation process. Due to the low grade of germanium fumes, a large amount of hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B41/00
CPCC22B7/001C22B7/02C22B41/00Y02P10/20
Inventor 唐建文杜国山羡鹏飞覃波徐月和李少华
Owner CHINA ENFI ENGINEERING CORPORATION
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