Method for recovering germanium dioxide from germanium-containing smoke dust

A germanium dioxide and germanium fume technology is applied in the field of metallurgical production of germanium, which can solve the problems of increased cost, low economy and high energy consumption, and achieve the effects of easy filtration, rapid precipitation process and coarse precipitated particles.

Active Publication Date: 2020-02-21
YANGZHOU NINGDA NOBLE METAL CO LTD
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Problems solved by technology

There are big problems in these processes, such as a large amount of acid solution increases the cost, sulfuric acid or hydrochloric acid has a big safety hazard, and the use of a large amount of acid brings big environmental problems, etc.
[0014] In addition, the relevant literature and patent technology disclose the secondary pyrolysis volatilization and enrichment method, which has the problems of flue gas pollution and loss of germanium in t

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  • Method for recovering germanium dioxide from germanium-containing smoke dust
  • Method for recovering germanium dioxide from germanium-containing smoke dust

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Embodiment Construction

[0049] 1. Combination figure 1 The process route of the present invention is described in detail.

[0050] 1. One cycle leaching:

[0051] (1) Mechanism:

[0052] Germanium leaching process: germanium dioxide is dissolved in ammonia water to form ammonium germanate, and germanium monoxide is oxidized to germanium dioxide.

[0053] GeO+H 2 o 2 = GeO 2 +H 2 o

[0054] GeO 2 +2NH 3 . h 2 O = (NH 4 ) 2 GeO 3 +H 2 o

[0055] During this process, impurity metals such as iron, arsenic, calcium, lead, and silicon in germanium-containing fumes do not participate in the reaction, and only 30-40 wt% of zinc is converted into complex ions. After cyclic leaching, a germanium solution containing more than 10 g / l of germanium can be obtained.

[0056] (2) Treatment process:

[0057] Add germanium-containing fumes, ammonia water, and hydrogen peroxide into the first airtight container, raise the temperature and keep it at 40-80°C, stir and react for 2-5 hours at the same tim...

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Abstract

The invention provides a method for recovering germanium dioxide from germanium-containing smoke dust and relates to the technical field of germanium metallurgy. After the germanium-containing smoke dust is leached by a two-stage alkali method, and the germanium dioxide is recovered by filtering, purification and precipitation methods. By the process method provided by the invention, the recoveryrate of the germanium can reach to more than 90 percent, and medicaments such as ammonia water, sodium hydroxide and magnesium salt can be recycled. The process has very positive significance in solving the problems of low germanium recovery rate, high consumption, high recovery cost, low resource utilization rate and serious environmental pollution in the traditional acid method treatment processof the smoke dust.

Description

technical field [0001] The invention relates to the field of metallurgical production of germanium. Background technique [0002] Germanium-containing fumes are low-grade germanium-containing waste residues, most of which come from germanium distillation residues, germanium recycling and processing wastewater sludge, germanium coal combustion gravity dust, etc., and the bag dust obtained after volatilization by fire method is in the form of off-white powder, containing germanium 1 to 3 wt%, and most of the rest are calcium oxide, silicon dioxide, and a small amount of metal impurities such as lead, arsenic, zinc, and iron. The main components are as follows: germanium 1~3wt%, Ca: 5~8wt%, SiO 2 : 60-75 wt%, As: 0.05-0.1 wt%, Zn: 0.05-0.1 wt%, Pb: 0.01-0.02 wt%, Fe: 0.1-0.3 wt%. [0003] So far, the methods for recovering germanium from germanium-containing fumes are as follows: [0004] 1. Fire recovery method: [0005] For example, CN201811446047.5 discloses a method for...

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Application Information

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IPC IPC(8): C22B41/00C01G17/02C22B7/00C22B7/02
CPCC01G17/02C22B7/006C22B7/008C22B7/02C22B41/00Y02P10/20
Inventor 岳喜龙许鹏冯修全樊红杰李静何国英
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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