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Method for separating and recovering gallium in gallium arsenide sludge

A technology for separation and recovery of gallium arsenide, applied in the field of hydrometallurgy, can solve the problems of difficult removal, high energy consumption, and difficult recovery, and achieve the effects of low cost, simple equipment and easy operation.

Active Publication Date: 2018-05-08
清远先导材料有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

The Chinese patent with the publication number CN102061389A uses high-temperature calcination and sulfuric acid leaching to recover metals from sludge containing 1.5%-15% arsenic; however, this method requires equipment with high energy consumption for calcination and cannot process gallium arsenide with complex components scrap
The Chinese patent with the publication number CN101857918A discloses a method for recovering gallium arsenide from waste. First, high-temperature calcination is used to sublimate and remove arsenic, and then electrolytically recover gallium after dissolving in aqua regia; but this type of method will generate a large amount of nitrogen oxides pollutants pollute the environment, and it is difficult to remove low-arsenic materials by calcination, part of arsenic is easy to enter the acid leaching solution, and at the same time, it is easy to produce highly toxic gas arsine (AsH 3 )
[0005] Moreover, due to the complex composition of gallium arsenide sludge, it is more difficult to recover, so far there has been no report on the recovery of gallium from it

Method used

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  • Method for separating and recovering gallium in gallium arsenide sludge
  • Method for separating and recovering gallium in gallium arsenide sludge
  • Method for separating and recovering gallium in gallium arsenide sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The gallium arsenide sludge used in Example 1 has a moisture content of 55%, and the main components are shown in Table 1.

[0057] Table 1 Main components of gallium arsenide sludge used in Example 1

[0058]

[0059] (1) Slurry alkaline leaching: Weigh 222.2g of gallium arsenide sludge (water content of 55%, dry weight of 100g) and 477.8g of water into a 2L beaker (solid-liquid ratio 1:6), turn on the stirring, Slurry at a speed of 1 / min for 2h, then add 180g of sodium hydroxide solid, heat to 90°C, react for 3h, add another 300g of water, continue the heat preservation reaction for 1h, and filter to obtain 750mL leachate.

[0060] Sampling is sent for inspection, and ICP-MS is used to detect Ga, As, Si, Fe, and Ca in the above-mentioned leaching solution. The results are as follows: the gallium content in the leaching solution is 2.637g / L, the arsenic content is 2.659g / L, the silicon content is 5.328g / L, the iron content is 1mg / L, and the calcium content is 10mg / L; calcula...

Embodiment 2

[0068] The water content of the gallium arsenide sludge used in Example 2 is 52%, and the main components are shown in Table 2.

[0069] Table 2 Main components of gallium arsenide sludge used in Example 2

[0070]

[0071] (1) Slurry alkali leaching: Weigh 208.4g gallium arsenide sludge (water content 52%, dry weight 100g) and 491.6g water into a 2L beaker (solid-liquid ratio 1:6), turn on the stirring, At a speed of 1 / min, the slurry was slurried for 1.5h, then 210g of sodium hydroxide solid was added, heated to 85°C, after 3h of reaction, 300g of water was added, the reaction was kept for 1h, and filtered to obtain 760mL of leachate.

[0072] Sampling is sent for inspection, and ICP-MS is used to detect Ga, As, Si, Fe, and Ca in the above-mentioned leaching solution. The results are as follows: the gallium content in the leaching solution is 1.944g / L, the arsenic content is 1.704g / L, the silicon content is 4.333g / L, the iron content is 2mg / L, and the calcium content is 12mg / L; ca...

Embodiment 3

[0080] The moisture content of the gallium arsenide sludge used in Example 3 is 59%, and the main components are shown in Table 3.

[0081] Table 3 Main components of gallium arsenide sludge used in Example 3

[0082]

[0083] (1) Slurry alkaline leaching: Weigh 243.9g gallium arsenide sludge (59% moisture content, 100g dry weight) and 456.1g water into a 2L beaker (solid-liquid ratio 1:6), turn on the stirring, Slurry for 1h at a rotation speed of 1h / min, then add 240g of sodium hydroxide solid, heat to 80°C, react for 4h, add 300g of water, continue to keep the reaction for 1h, and filter to obtain 740mL leachate.

[0084] Sampling is sent for inspection, and ICP-MS is used to detect Ga, As, Si, Fe, and Ca in the above-mentioned leaching solution. The results are as follows: the gallium content in the leaching solution is 4.285g / L, the arsenic content is 4.544g / L, the silicon content is 6.786g / L, the iron content is 3mg / L, and the calcium content is 14mg / L; calculated, the gallium...

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Abstract

The invention provides a method for separating and recovering gallium in gallium arsenide sludge. The method comprises the following steps that (a) the gallium arsenide sludge and water are mixed according to the solid-to-liquid ratio being 1:(5-6) to form slurry, strong base is added for alkaline leaching, and lixivium is obtained after filtering is carried out; (b) the lixivium obtained throughthe step (a) is neutralized and filtered to obtain neutralizing slag; (c) the neutralizing slag obtained through the step (b), water and concentrated sulfuric acid are mixed to be subject to acid leaching silica removal, and gallium containing filter liquor is obtained after filtering; and (d) the gallium containing filter liquor and sodium hydroxide ate mixed to be subject to gallium deposition,and gallium hydroxide is obtained after filtering is carried out. Compared with the prior art, the method adopts specific processes of slurry alkaline leaching, neutralizing, acid leaching silica removal and gallium deposition, and separation and recovery of the gallium from the gallium arsenide sludge are achieved; the method for separating and recovering the gallium in the gallium arsenide sludge is high in recovery rate; and in addition, high temperature furnace burning is not needed, the energy consumption is low, and meanwhile, poisonous and harmful gas cannot be generated, and pollutionis avoided.

Description

Technical field [0001] The invention relates to the technical field of hydrometallurgy, and more specifically, to a method for separating and recovering gallium in gallium arsenide sludge. Background technique [0002] Gallium (Ga) is one of the important rare metals. Gallium arsenide (chemical formula GaAs) relies on its high frequency, high electron mobility, low noise, high output power, low power consumption, high efficiency, good linearity, and resistance to distortion And other characteristics, has become one of the most important compound semiconductor materials. [0003] In the production process of gallium arsenide wafers, cutting, grinding, polishing and other processes will generate a large amount of waste water. The main pollutants are micron or nanometer gallium arsenide particles and emery particles that exist in a suspended state. The current treatment of such waste water is commonly used The coagulation sedimentation method with lime, iron salt and flocculant, and ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B58/00
CPCC22B7/008C22B58/00Y02P10/20
Inventor 陈辉殷亮熊平朱刘
Owner 清远先导材料有限公司
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