Research Progress in Recovery and Regeneration of Gallium Arsenide Waste AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23050001

Chinese Library Classification Number:TF09

Citation Information:

With the progress and development of science and technology，the second-generation semiconductor materials represented by gallium arsenide （GaAs） have gradually replaced silicon materials in electronic communications，national defense，aerospace and other fields. Every year，a large amount of GaAs wastes are generated from the crystal growth in upstream，design and processing in midstream and scrap in downstream of the GaAs industry chain. Without in time treatment，the arsenic in GaAs wastes may enter the soil or groundwater with human activities and geological processes，posing a threat to the natural environment and human health. GaAs wastes are one of the main sources of arsenic and gallium resources because of its high grade and large stock. The clean and efficient recycling of GaAs wastes have received wide attention in recent years. This article started from the perspective of the gallium arsenide industry chain，the different recovery processes of GaAs crystal cutting scrap from upstream，GaAs processing wastes from midstream and used GaAs electronic devices were reviewed. The purity of GaAs scrap produced by cutting in the upstream of the industry chain was high，both wet and fire processes could achieve effective separation and recovery of arsenic and gallium. Acid leaching of GaAs cutting scrap，combined with selective precipitation，extraction，resin adsorption and alkaline electrolysis to recover gallium was a relatively mature technology for industrial recovery of GaAs at present. However，a large amount of acidic solution was added in the wet process and the generation of arsenic-containing waste water was inevitable. The processing process and production costs would increase as a result. In contrast，the fire process had shorter processes and simpler operations. But the oxidation roasting method and sulfurization heat treatment method also had the possibility of producing toxic gases containing arsenic. As a new method in recent years，the vacuum decomposition method recovered gallium and arsenic directly in elemental form under vacuum conditions，which had obvious advantages in terms of safety and efficiency，and it was one of the most promising GaAs recovery processes at present. However，the presence of GaAs clusters always affected the recovery rate，and further in-depth study was still needed. GaAs processing process in the middle reaches of the industrial chain such as cutting and grinding generated a large amount of GaAs containing waste water. The composition of waste slag and sludge from GaAs processing waste water by coagulation and sedimentation of iron compounds were complex. Impurities such as mixed iron had a major impact on the subsequent recovery process. Therefore，iron removal became a key issue in the recovery of GaAs processing wastes. Additives with stronger binding ability to Ga³⁺ were usually selected to extract gallium. Sometimes，arsenic and gallium resources in GaAs processing wastes were also prepared into compound products such as gallium oxide and sodium arsenate crystals. It was beneficial to shorten the waste recovery process，reduce the treatment cost and the discharge of arsenic-containing waste liquid. At the same time，it met the needs of gallium oxide semiconductor，sodium arsenate drugs and other aspects of China. In the downstream of the industry chain，GaAs was encased in organic casings in used electronic devices such as light-emitting diodes （LED），integrated circuits （ICs） and solar cells. The efficient removal of organic matter from used GaAs containing devices，extraction of GaAs and recycling of arsenic and gallium had become a research hotspot for many scholars. The hydrothermal treatment and thermal decomposition were the main methods to remove surface organic matter. The treatment effect of hydrothermal treatment on various used electronic devices was different，which was easy to cause the loss of arsenic. The oxidation of gallium on the surface of GaAs was easily caused by oxygen produced during the thermal decomposition of organic matter. Both of these pretreatment methods to remove organic matter were immature. In summary，the fire process had obvious advantages in recovering GaAs scrap with less impurities. But the industrial recovery of GaAs waste was still dominated by the more selective wet process at present. Based on the huge production and consumption of GaAs in China and the current situation of recycling various types of GaAs wastes，it was believed that there were still challenges in terms of recycling cost，safety，efficiency and product purity. In the future，the development of high performance and low cost extractants and chelating resins for wet process should be focused on. The scale of thermal recovery should be expanded，the arsenic condensation process should be optimized，and the purity of the recovered product should be balanced with the recovery rate. The special equipment for pretreatment of used GaAs electronic devices should be developed and gradually applied in industrial production. The properly combining wet and fire recycling processes to comprehensively improve the recycling efficiency of GaAs wastes. The development of China's semiconductor wastes recycling industry would be promoted towards high yield and efficiency.