China Nonferrous Metallurgy

The patent technology of selenium purification and preparation is an important path to understanding the research progress of purification technology for selenium. This article conducts a statistical analysis of patents related to selenium purification and high-purity selenium preparation, summarizes domestic and foreign selenium purification and high-purity selenium preparation technologies, and the advantages and disadvantages of purification processes were discussed. Globally, China and Japan are the main countries for patent applications in selenium purification and high-purity selenium preparation technology, and the patent application units in this field in China are mainly concentrated in Yunnan Province and Guangdong Province. The hydrometallurgical purification process, combined pyrometallurgical and hydrometallurgical processes, and vacuum distillation process are suitable for purifying selenium containing materials to prepare selenium products with a selenium grade of ＜99.9%. Among them, the combination of vacuum distillation with oxidation to remove tellurium, melting and slagging processes can achieve good separation of selenium and tellurium, which has industrial application prospects for it's simple equipment and low cost ; The oxidation volatilization process is suitable for purifying and preparing 4N and above selenium products, which has a high recovery rate, but the adaptability for raw materials is poor, and the degree of automation of the volatilization equipment is low, automation and environmental improvement are the improvement direction in future. The regional melting process is suitable for preparing 5N and above high-purity selenium, but it has high equipment requirements, small processing scale, low adaptability to raw materials, and limited patent applications and research. In the future, a single purification technology will be difficult to preparing of high-purity selenium, and the combination of multiple purification processes will be the development direction for preparation technology of high-purity selenium. In addition, equipment automation and intelligence will also be the focus of research and development in the fields of selenium purification and high-purity selenium preparation.