• 关键词：水泥窑共处置产品  X射线吸收近边结构光谱(XANES)  重金属  微观组成

• 基金项目：国家"十一五"科技支撑计划项目(No.2007BAC16B03,2006BAC02A19)

• 薛靖川
• 中国环境科学研究院,北京 100012

• 黄启飞
• 中国环境科学研究院,北京 100012

• 杨玉飞
• 1. 中国环境科学研究院,北京 100012;
  2. 北京科技大学土木与环境工程学院,北京 100083;
  3. 浙江工业大学浙西分校, 衢州 324000

• 摘要：在模拟水泥窑中高温煅烧掺有Ni、Cd化学试剂的水泥生料,并由制取的水泥熟料制备水泥净浆片.利用X射线吸收近边结构光谱(XANES)对水泥窑共处置产品中Ni、Cd的微观组成进行了研究.结果表明:Ni在水泥窑煅烧过程中发生了较为彻底的化学变化,形成了Ni-Mg化合物,该化合物可能是以氧化物、氢氧化物或碳酸盐的形式存在;水泥净浆中Ni的存在形态和水泥熟料中基本相同,表明水化过程对Ni的形态影响较小;水泥净浆中存在的Cd化合物及其比例分别为:CdSO₄ 42.4%, CdO 40.4%,CdCO₃ 17.1%;Cd化合物在水泥净浆中可能以吸附、包容等方式存在于Ca(OH)₂晶体中,较难浸出.

• Abstract：A high-temperature calcination simulation in cement kiln was carried out to acquire clinker from heavy metals contained hazardous waste co-processing. The compositions of Ni and Cd compounds in the clinker and cement paste made from clinker were studied using X-ray absorption near edge structure (XANES). Significant change of Ni compounds in calcinations process was found. Different from Ni compounds added to raw material, most of Ni in clinker existed as oxides, hydroxides or carbonates Ni-Mg compound in the clinker. Little difference was found between the composition of Ni compounds in the cement paste and that in the clinker. It indicated that Ni-Mg compound changed little in hydration process. Cd in cement paste mainly existed as CdSO₄, CdO, and CdCO₃. The percentage of CdSO₄, CdO and CdCO₃ was 42.4%, 40.4% and 17.1%, respectively. The Cd coumpounds in cement paste may be adsorbed by Ca(OH)₂ crystals or imbedded in Ca(OH)₂ crystals with low leachability.

• Key words：co-processed products in cement kiln  X-ray absorption near edge structure (XANES)  heavy metals  microscale investigation

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