Research Progress in the Synthesisand Process Application of Scorodite

Scorodite (FeAsO 4 2H 2 O) is currently recognized as the safest arsenic fixation material for the environment due to its combination of high arsenic capacity and high stability.As a means of arsenic fixation and disposal, the scorodite precipitation method is widely used to treat arsenic-containing wastewater and arsenic-bearing solid wastes.In this paper, three types of scorodite synthesis methods (the hydrothermal method, the atmospheric method, and the biological method) proposed and developed in recent decades are first reviewed.The principles, application scope, advantages, and disadvantages of these methods are systematically described.In addition, some important derived synthesis methods are discussed.At the same time, the application of the scorodite process, developed based on four synthesis methods, is introduced.Compared with other synthesis methods, the improved atmospheric synthesis method has become the mainstream selection for scorodite synthesis because of its simple operation and high arsenic removal efficiency, as well as the advantages of large particle size and the high leaching stability of the product.Therefore, the elevated temperature and atmospheric pressure process is likely to be widely adopted in the future.Finally, the directions and application prospects of the scorodite process are proposed.