Abstract:The continuous reduction process of wet preparation of arsenic trioxide was studied by means of industrial test. Through the study of connecting pipe connection mode, inlet pipe mode, maximum liquid inlet volume and inlet mode, the best process conditions were determined, and the methods to solve the large amount of air duct cleaning labor, fine particles of finished products after reduction and difficult drying and packaging were found, The purpose is to solve the production difficulties faced by the reduction process of wet arsenic production, and provide conditions for the intelligent transformation of the reduction process.