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Method for separating germanium particles from waste water containing fine particles of germanium

A fine particle, waste water technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of centrifuge removal of germanium particles, small germanium particles, and large amount of waste water.

Active Publication Date: 2011-11-30
BEIJING TONGMEI XTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of waste water and the small germanium particles, it is impossible to directly remove germanium particles from the wastewater by centrifuge; if drying or evaporation is used, the treatment cost will be too high
At present, this kind of wastewater can only be treated by general wastewater treatment technology, which inevitably leads to the inability to use germanium in the wastewater and the problem of high energy consumption

Method used

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  • Method for separating germanium particles from waste water containing fine particles of germanium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 1 dm3 of a waste water containing fine particles of germanium from the germanium wafer production process. Tests show that the germanium particles have a diameter of no more than 0.5 μm and a content of 0.0037% by weight.

[0026] In the wastewater, add 0.65% by weight of polyaluminum chloride ([Al 2 (OH) n Cl 6-n ] m , where m=10, n=5) (germanium particles: polyaluminum chloride=1:176). The waste water was left to stand for 150 minutes.

[0027] Separate the water of upper layer, analyze its content, the result is as described in table 1.

[0028] The paste-like germanium granules in the lower layer are taken out for later use (for subsequent processing, including acid dissolution and purification by prior art methods).

Embodiment 2

[0030] Take 1 decimeter of waste water containing fine particles of germanium from the germanium wafer production process, and adjust its concentration. Tests show that the germanium particles have a diameter of no more than 0.5 μm and a content of 0.0025% by weight.

[0031] In the wastewater, add 0.3% by weight of polyaluminum chloride ([Al 2 (OH) n Cl 6-n ] m , wherein m=10, n=5) (germanium particles: polyaluminum chloride=1:120). After stirring with a rotor stirrer at 30 rpm for 20 seconds, 0.65% by weight of cationic polyacrylamide (germanium particles: cationic polyacrylamide = 1:260) with a weight average molecular weight of 13,000,000 was added immediately.

[0032] The wastewater was left to stand for 45 minutes.

[0033] Separate the water of upper layer, analyze its content, the result is as described in table 1.

[0034] The paste-like germanium granules in the lower layer are taken out for later use (for subsequent processing, including acid dissolution and ...

Embodiment 3

[0036] Take 1 decimeter of waste water containing fine particles of germanium from the germanium wafer production process, and adjust its concentration. Tests show that the germanium particles have a diameter of no more than 0.5 μm and a content of 0.0030% by weight.

[0037] In the waste water, 0.45% by weight of aluminum sulfate (germanium particles:aluminum sulfate=1:150) was added. After stirring with a rotor stirrer at 20 rpm for 20 seconds, 0.4% by weight of polyvinyl methyl ether with a weight average molecular weight of 15,000,000 (germanium particles: polyvinyl methyl ether = 1:133) was added immediately.

[0038] The waste water was left to stand for 30 minutes.

[0039] Separate the water of upper layer, analyze its content, the result is as described in table 1.

[0040] The paste-like germanium granules in the lower layer are taken out for later use (for subsequent processing, including acid dissolution and purification by prior art methods).

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Abstract

The invention relates to a method for separating germanium particles from wastewater containing fine granular germanium, which comprises the following steps of: preparing the wastewater containing the fine granular germanium; detecting the content of the fine granular germanium in the wastewater; adding an inorganic flocculating agent into the wastewater according to a ratio by weight of the germanium particles to the inorganic flocculating agent of 1:(25-250); standing the wastewater for 5 to 150 minutes; and separating out water on the upper layer and taking out the pasty germanium particles on the lower layer. In one preferable embodiment, an organic flocculating agent is also added into the wastewater according to a ratio of the germanium particles to the organic flocculating agent of1:(25-300) between the step of adding the inorganic flocculating agent and the step of standing.

Description

technical field [0001] The invention relates to a method for separating germanium particles from wastewater containing fine germanium particles. Background technique [0002] In the process of manufacturing germanium semiconductor wafers, it is necessary to go through the cutting steps of cutting germanium crystal rods into germanium wafers, as well as subsequent polishing steps. During these steps, a large amount of waste water containing fine particles of germanium is produced. Due to the large amount of waste water and the small germanium particles, it is impossible to directly remove germanium particles from the wastewater by centrifuge; if drying or evaporation is used, the treatment cost will be too high. At present, this kind of wastewater can only be treated by general wastewater treatment technology, which inevitably results in the inability to utilize germanium in the wastewater and the problem of high energy consumption. Therefore, it is desired to have a method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/54C02F1/62
Inventor 刘继斌史铎鹏
Owner BEIJING TONGMEI XTAL TECH CO LTD