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Method for recovering germanium from germanium smoke dust by microwave pretreatment

A germanium fume and pretreatment technology, which is applied in the field of metallurgy and chemical industry, can solve the problems of inability to realize industrialization, low recovery rate of germanium, high silicon content, etc., and achieve the effect of increasing leaching rate, high leaching rate and fast leaching speed

Active Publication Date: 2014-02-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these recovery methods all have respective weak point: the method germanium recovery rate of the low cost method is low, the method cost of the high germanium recovery rate is higher or can't realize industrialization
The low grade of germanium in germanium-containing materials, high silicon content and germanium being encapsulated by other minerals are the main reasons for the low recovery rate of germanium
Conventional ore processing technology is difficult to meet the needs of actual production, so unconventional methods can be used to process germanium-containing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. 800g germanium-containing soot with a mass percentage of 0.04% (Ge0.04%, Zn:1.56%, Fe:1.89%, Si:2.15%) was pretreated by microwave heating at a frequency of 2450MHz and a temperature of 200°C 1min;

[0031] B. Using 1600 mL of sulfuric acid solution with a concentration of 10 mol / L as the leaching agent, dissolving the germanium-containing fumes obtained in step A at a liquid-solid ratio of 2:1, stirring and leaching at a temperature of 70° C. for 0.8 hours;

[0032] C. Then filter and separate the leached solution obtained in step B, wash three times, and discard the filter residue to obtain a germanium-containing liquid, the leaching rate of germanium is 80.13%.

Embodiment 2

[0034] A. 100kg germanium-containing soot with a mass percentage of 0.12% (Ge: 0.12%, Zn: 5.66%, Fe: 3.89%, Si: 1.85%) is pretreated by microwave heating at a frequency of 2450MHz and a temperature of 300°C 30min;

[0035] B. Using 400L of sulfuric acid solution with a concentration of 6mol / L as the leaching agent, dissolving the germanium-containing fumes obtained in step A at a liquid-solid ratio of 4:1, stirring and leaching for 0.5 hours at a temperature of 90°C;

[0036] C. Then filter and separate the leached solution obtained in step B, wash three times, and discard the filter residue to obtain a germanium-containing liquid, the leaching rate of germanium is 82.88%.

Embodiment 3

[0038] A. 300g germanium-containing soot (Ge: 1%, Zn: 3.26%, Fe: 2.12%, Si: 1.65%) with a mass percentage of 1% germanium was pretreated by microwave heating at a frequency of 2450MHz and a temperature of 500°C 8min;

[0039] B. Using 2400 mL of sulfuric acid solution with a concentration of 15 mol / L as the leaching agent, dissolving the germanium-containing fumes obtained in step A at a liquid-solid ratio of 8:1, stirring and leaching at a temperature of 50° C. for 5 hours;

[0040] C. Then filter and separate the leached solution obtained in step B, wash three times, and discard the filter residue to obtain a germanium-containing solution, the leaching rate of germanium is 86.52%.

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Abstract

The invention relates to a method for recovering germanium from germanium smoke dust by microwave pretreatment. The method comprises the following steps of: carrying out microwave heating pretreatment on germanium-containing smoke dust; dissolving the germanium-containing smoke dust obtained by microwave heating pretreatment with a sulfuric acid solution as a leaching agent, and stirring and leaching; and filtering and separating the solution obtained by leaching, washing three times, and discarding filter slag so as to obtain a germanium-containing liquid. By adopting the method provided by the invention, the leaching rate of germanium reaches more than 75%; and the leaching rate of germanium is improved by more than 15% as compared with direct sulfuric acid leaching. According to the invention, microwave heating pretreatment is carried out on the germanium smoke dust, so that difficult-soluble germanium is converted to easy-soluble germanium, thereby improving the leaching rate of germanium. The method provided by the invention has the advantages of simple process, short process flow, high leaching speed and high leaching rate.

Description

technical field [0001] The invention relates to a method for recovering germanium from germanium fume by microwave pretreatment, belonging to the technical field of metallurgy and chemical industry. Background technique [0002] At present, germanium occupies an increasingly important position in the fields of optical fiber, infrared optics, and solar cells. Most developed countries in Europe and the United States list germanium as a national defense reserve resource. [0003] But germanium is a kind of scattered metal, and the resources of germanium in the world are relatively poor. my country's germanium reserves rank among the top in the world, and germanium is generally associated with copper, lead, zinc and other metal ores and coal mines. Mainly distributed in Ulan Tuga Coal Mine in Shengli Coalfield, Inner Mongolia, Yingcheng Coal Field, Jiutai City, Jilin Province, Fankou Lead-Zinc Mine in Renhua County, Guangdong Province, Daliangzi Lead-Zinc Mine Deposit in Huido...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B41/00C22B1/00
CPCY02P10/20
Inventor 彭金辉王万坤张泽彪王仕兴
Owner KUNMING UNIV OF SCI & TECH