Effect of Slag and Hot Metal Compositions on Arsenic Content in Molten Iron

The impact of slag basicity,initial sulfur content and temperature of hot metal on the arsenic content in hot metal were studied in this paper.Results show that arsenic content increases with basicity (% CaO)/(% SiO₂). When basicity exceeds 1.16 arsenic content changes slowly. Increasing slag basicity at a certain level is in favor of dearsenication. As the initial sulfur content in pig iron increases,arsenic content in hot metal increases,which indicating that slag dearsenication rate decreases. Thus,higher sulfur content in pig iron results into a higher arsenic level in hot metal. In the practical production [S]should be minimized and sulfur content in pig iron should be controlled in order to lower arsenic content. Dearsenication rate decreases with increasing temperature in the range of 1 400 ~ 1 550 ℃.When temperature exceeds 1 475 ℃,the dearsenication rate decrease drastically.