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Vapor Pressure Measurements of heavy Metal Component in Molten Slag and Incinerator Residue by Transpiration Method Using Vertical Volatilization Chamber

立式挥发室蒸腾法测定熔渣和焚烧炉残渣中重金属组分的蒸气压

基本信息

批准号：
13650798
负责人：
HINO Mitsuhisa
金额：
$ 2.18万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

As fundamentals for developing an efficient process to eliminate detrimental components such as lead, arsenic and antimony in the molten slag and incinerator residue by means of volatilization, the data on vapor pressure and activity coefficient of these components are of practical importance. Hence, in the present study, a transpiration method using a vertical volatilization chamber was developed and the vapor pressure of PbO in the liquid PbO-FeO_<1.5>-CaO-SiO_2 and PbO-ZnO-FeO_<1.5>-CaO-SiO_2 slags and those of SbO_<1.5>, SbO_<2.5> and AsO_<2.5> in the liquid CaO-SiO_2-FeO_<1.5> slags were determined at 1150-1300℃. On the basis of these data, the activity coefficients of these components in the slag were derived.For any slag investigated, the activity of PbO was found to present a negative deviation from the Raoultian behavior and the activity coefficient of PbO showed a minimum value at the mole fraction of PbO in the slag with about 0.5. It was found that the activity coefficient of PbO increased with increasing basicity of slag. It was also clarified that the activity coefficient of PbO in the slag with ZnO was smaller than that in the slag without ZnO.The gas species evaporated from the slags were evaluated using the obtained thermodynamic data and it was suggested that the PbO monomer is prevailing in the gas phase while As_4O_6 and Sb_4O_6 prevail for arsenic oxide and antimony oxide, respectively. Thus, the volatilization behavior of these heavy metal components in the slag and incinerator residue was discussed on the basis of the obtained data.

熔渣和焚烧炉渣中铅、砷、锑等有害成分的蒸气压和活度系数的数据具有重要的实际意义，是开发利用挥发法有效去除这些有害成分的基础。为此，本文采用垂直挥发室蒸发法，测定了PbO- feo_ <1.5>-CaO-SiO_2和PbO- zno - feo_ <1.5>-CaO-SiO_2液态渣中PbO的蒸气压，以及CaO-SiO_2-FeO_<1.5>液态渣中SbO_<1.5>、SbO_<2.5>和AsO_<2.5>的蒸气压。在此基础上，推导出了这些组分在渣中的活度系数。对于所研究的任何渣，PbO的活度都与Raoultian行为呈负偏差，PbO的活度系数在渣中PbO的摩尔分数处呈现最小值，约为0.5。结果表明，PbO的活度系数随矿渣碱度的增加而增大。结果表明，氧化锌渣中PbO的活度系数小于无氧化锌渣中PbO的活度系数。利用所得的热力学数据对渣中蒸发的气体种类进行了评价，表明气相中以PbO单体为主，而氧化砷和氧化锑的气相分别以As_4O_6和Sb_4O_6为主。因此，根据所获得的数据，讨论了这些重金属成分在炉渣和焚烧炉渣中的挥发行为。