景明海1,
刘盖1,
艾涛1,
苏兴华1
1.长安大学材料学院,西安710061
基金项目: 国家重点基础研究发展计划(973)项目(2015CB655105)
Heavy metal leaching property of high-melting point MSWI fly ash by molten salt process
ZHAO Peng1,,JING Minghai1,
LIU Gai1,
AI Tao1,
SU Xinghua1
1.College of Material Science and Engineering,Chang′an University, Xi′an 710061,China
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摘要:对熔盐法处置高熔点垃圾焚烧飞灰重金属离子浸出特性进行了实验研究。结果表明,熔盐物料组成、熔盐温度和热处理气氛对重金属离子的热挥发特性具有重要影响。在还原性气氛条件下,热处理温度为900～1 000 ℃,添加质量分数为10%～50%的CaCl2的氯化钠熔盐中处理2 h后,垃圾焚烧飞灰渣中Pb、Cd、Cu和Zn等重金属浸出浓度降低90%以上,可以完全达到生活垃圾填埋场填埋标准。在此过程中,灰渣较原灰可减轻50%,同时转化成具有良好胶凝性能的水泥活性混合材料,XRD测试表明其晶体矿物组成为硅酸二钙、硅酸三钙和阿里尼特以及硫酸钙等。
关键词: 垃圾焚烧飞灰/
重金属/
熔盐法/
水泥混合材
Abstract:The heavy metal leaching property of municipal solid waste incineration fly ash disposed by molten salt process was studied. The results indicated that molten salt composition, molten salt temperature and heat treatment atmosphere had a significant impact on the heavy metal thermal evaporation. The leaching concentration of Pb, Cd, Cu, Zn and other heavy metals in the MSWI fly ash was down more than 90%, which treated by sodium chloride molten salts contained 10% to 50% of calcium chloride at 900 to 1 000 ℃ for 2 hours, and it could be fully met the landfill standards, and meanwhile, the MSWI fly ash weight was reduced by 50 % than the original weight after molten salt treatment, which has a very good performance by using it as the cement active mixture. XRD indicated that the crystal mineral composition of the MSWI fly ash treated was including of alite and belite and alinite and calcium sulfate and so on.
Key words:municipal solid waste incineration fly ash/
heavy metal/
molten salt process/
cement active mix.
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熔盐法处置高熔点垃圾焚烧飞灰重金属的浸出特性
赵鹏1,,景明海1,
刘盖1,
艾涛1,
苏兴华1
1.长安大学材料学院,西安710061
基金项目: 国家重点基础研究发展计划(973)项目(2015CB655105)
关键词: 垃圾焚烧飞灰/
重金属/
熔盐法/
水泥混合材
摘要:对熔盐法处置高熔点垃圾焚烧飞灰重金属离子浸出特性进行了实验研究。结果表明,熔盐物料组成、熔盐温度和热处理气氛对重金属离子的热挥发特性具有重要影响。在还原性气氛条件下,热处理温度为900～1 000 ℃,添加质量分数为10%～50%的CaCl2的氯化钠熔盐中处理2 h后,垃圾焚烧飞灰渣中Pb、Cd、Cu和Zn等重金属浸出浓度降低90%以上,可以完全达到生活垃圾填埋场填埋标准。在此过程中,灰渣较原灰可减轻50%,同时转化成具有良好胶凝性能的水泥活性混合材料,XRD测试表明其晶体矿物组成为硅酸二钙、硅酸三钙和阿里尼特以及硫酸钙等。
English Abstract
Heavy metal leaching property of high-melting point MSWI fly ash by molten salt process
ZHAO Peng1,,JING Minghai1,
LIU Gai1,
AI Tao1,
SU Xinghua1
1.College of Material Science and Engineering,Chang′an University, Xi′an 710061,China
Keywords: municipal solid waste incineration fly ash/
heavy metal/
molten salt process/
cement active mix
Abstract:The heavy metal leaching property of municipal solid waste incineration fly ash disposed by molten salt process was studied. The results indicated that molten salt composition, molten salt temperature and heat treatment atmosphere had a significant impact on the heavy metal thermal evaporation. The leaching concentration of Pb, Cd, Cu, Zn and other heavy metals in the MSWI fly ash was down more than 90%, which treated by sodium chloride molten salts contained 10% to 50% of calcium chloride at 900 to 1 000 ℃ for 2 hours, and it could be fully met the landfill standards, and meanwhile, the MSWI fly ash weight was reduced by 50 % than the original weight after molten salt treatment, which has a very good performance by using it as the cement active mixture. XRD indicated that the crystal mineral composition of the MSWI fly ash treated was including of alite and belite and alinite and calcium sulfate and so on.
