Preparation of elemental As from As-Sb fly ash using continuous reductive method with additive of lead oxide

Abstract

To recycle arsenic from an As-Sb fly ash, a newly continuous reductive method for obtaining elemental As with additive of PbO was proposed. In the first reduction stage, PbO promoted the As segregation from the As-Sb fly ash, due to which most As volatilized and Sb retained in roasted residues in phases of As-Sb-Pb-O and As-Sb-Pb alloy. With the increase of PbO and reductant amounts, the Sb fixation rate increased in the first reduction stage, and further the Sb content in the elemental As obtained from the second reduction stage decreased. After being roasted for 30 min at 550 °C with the addition of 20% activated carbon and 12% PbO in the first reduction stage, the As volatilization rate and Sb fixation rate from the As-Sb fly ash reached 92.86% and 79.38%, respectively. Then through the second reduction of the volatile matters at 650 ° C, the As and Sb contents in the obtained elemental As reached 99.07 wt% and 0.22 wt% respectively, indicating that the obtained As could be used to prepare high purity As, thereby rendering the As-Sb fly ash recycling.

Keywords

As-Sb fly ash / lead oxide / continuous reduction / elemental As / separation of As and Sb

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