Preparation of metal arsenic from calcium arsenic slag by ferrothermal reduction

Under the dual pressure of resources and the environment, how to deal with the issues of harmlessness and utilization of metallurgical calcium arsenic slag produced by the nonferrous metallurgical industry has become the key to eliminating "arsenic damage" thoroughly, which has great significance to the whole metallurgical industry. In this paper, calcium arsenic slag was directly reduced by a short process of iron reduction, and arsenic was recovered in the form of arsenic. The results showed that under the conditions of a reduction temperature of 1050 ℃, holding time of 30 min, and iron blending coefficient of 1.5, the ideal arsenic removal effect could be obtained, and the reduction rate of arsenic could reach 96.56%. The product and reduced slag were analyzed by XRD and SEM-EDS. The reduction products were elemental arsenic with a purity of approximately 99%, and the main components of the slag were Ca₂Fe₂O₅ and CaO.