水泥熟料形成过程中重金属价态变化分析

采用基于同步辐射光源的X射线吸收精细结构谱（XAFS）,研究了掺烧As^5＋、Cr^6＋、Cr^3＋的水泥熟料中,As和Cr在水泥熟料形成过程中价态变化行为.结果表明：掺加As^5＋和Cr^6＋的水泥生料经高温煅烧后化学价态没有发生变化,掺烧As^5＋水泥熟料中As以As^5＋的形式存在;掺烧Cr^6＋水泥熟料中Cr仅以Cr^6＋的形式存在,说明水泥生料中含有的微量Cr^3＋在煅烧过程中已完全被氧化为Cr^6＋;掺烧Cr^3＋水泥熟料中含有Cr^3＋和Cr^6＋,大部分Cr^3＋在水泥熟料形成过程中被氧化为Cr^6＋.

Valence Changes of Heavy Metal in Clinker

The valence changes of As, Cr in As^5＋ , Cr^6＋ , Cr^3＋ mixing clinker were studied by Synchrotron-based X-ray absorption fine structure spectroscopy. The results showed that the valences of As^5＋ and Cr^6＋ have no change after the raw meal high-temperature calcination. Adding As^5＋ into raw meal, there only has As^5＋ in clinker after calcination; similarly, adding Cr^6＋ to raw meal, there only has Cr^6＋ in clinker after calcination, Cr^3＋ which in raw material were entirely oxidized to form Cr^6＋ ; However, adding Cr^3＋ to raw meal, there not only has Cr^3＋ but also has Cr^6＋ in clinker after calcination. Cr^3＋ was oxidized to form Cr^6＋ during the clinker formation.