高砷锑氧粉和砷碱渣共焙烧过程中砷锑迁移转化机理

Migration and Transformation Mechanisms of As and Sb during Co-sintering of As-Sb-bearing Dust and Arsenic-Alkali Residue

采用以废治废的思路,以砷碱渣为碱源加入到高砷锑氧粉中共焙烧,通过研究挥发气氛、烟尘及焙烧渣中组成成分和As、Sb含量,分析As、Sb转化迁移机理。研究表明,高砷锑氧粉和砷碱渣的共焙烧,能显著减少砷、锑的挥发;当高砷锑氧粉和砷碱渣的质量配比为1︰1时,砷的固化率由10%提高到85%;砷主要以Na_(3)AsO_(4)、NaAsO_(2)、As_(2)O_(5)的形式固定在焙烧渣中,锑主要以NaSbO_(3)、NaSbO_(2)的形式固定在焙烧渣中。

With idea of treating the wastes with wastes,arsenic-alkali residue was used as alkali source and co-sintered with As-Sb-bearing dust.As and Sb content,and composition in volatilization atmosphere,dust and roasting residue were investigated to analyze migration and transformation mechanism of As and Sb.The results shows that co-sintering of As-Sb-bearing dust and arsenic-alkali residue can effectively reduce volatile of As and Sb.The solidifying efficiency of As is up to 85% when mass ratio of As-Sb-bearing dust and arsenic-alkali residue is 1︰1.As is mainly solidified as the form of Na_(3)AsO_(4),NaAsO_(2),and As_(2)O_(5),while Sb is mainly solidified as the form of NaSbO_(3) and NaSbO_(2).