中文摘要：

针对火电厂旋风炉掺烧铬渣高温熔融固化处理方式,采用X射线衍射仪（XRD）、X射线荧光光谱测试仪（XRF）、物理吸附仪和电感耦合等离子体原子发射光谱仪（ICPGAES）等分析仪器对样品进行测试分析,研究煤和铬渣燃烧过程中铬元素所形成的多种含铬矿物质的转化规律.结果表明：有9种含铬矿物经过燃烧高温熔融后转变为5种,最终排出Cr OCl、KCr3O82种铬矿物;底渣中Cr6＋质量比从3772μg/g降至4.60μg/g,符合灰渣排放要求;在高温熔融过程中铬离子优先与卤族元素Cl、F结合,可能原因是铬的卤素化合物沸点较低;为了提高Cr6＋→Cr3＋转化率,应在燃烧区域制造还原性氛围和酸性环境,尽可能多地形成Cr2O3中间体.

英文摘要：

For the high temperature melting and solidification mode of chromium slag mixed burned with coal in cyclone furnace of power stations, the X-ray diffractometer （XRD）, the X-ray fluorescence spec- trometre （XRF） and the inductively coupled plasma-optical emission spectrometer （ICP-AES） were applied to detect the samples, to investigate the migration and evolution behaviors of the chromium minerals during the co-combustion of coal and chromium slag. The results show that, nine kinds of chrome minerals before combustion transferred to five kinds of other chrome minerals after high temperature melting, and finally became two kinds of chrome minerals, CrOC1 and KCr3 08. The concentration of Cr6＋ in the bottom slag de- creased from 3 772 μg/g to 4.60 μg/g,which satisfies the criterion of ash/slag emission. In high tempera- ture melting process,the chromium ion combined with the halogen elements Cl and F firstly,this may be because the halogenated compounds of chromium have lower boiling points. In order to increase the conver- sion of Cr6＋ to Cr3＋ ,the deoxidization and acid atmosphere should be kept in the combustion area to make the intermediate products Cr2 03 form as much as possible.