Comparison of Leaching Characteristics of Lead in Waste CRTs
This study investigates four extraction methods (water extraction,toxicity characteristics leaching procedure (TCLP),modified TCLP with pH control and sequential chemical extraction (SCE)), each representing different liquid-to-solid (L/S) ratios,pH controls,and types of leachant and their effects on the leaching concentration of Pb in cathode ray tubes (CRTs).The results indicated that for extraction with distilled water,the lead leaching concentration (mg/L) decreased with L/S ratio in the range of2-100. The results also showed that the leaching concentration was strongly pH-dependent in the TCLP and modified TCLP tests. In modified TCLP tests,in the case of pHs lower than 6.3,the leaching concentrations of Pb decreased with an increase in pH. Due to the nature of amphoteric elements,in the case of pHs higher than 7,the Pb leaching concentration increased with increasing pH. In SCE tests,the Pb speciation approached the extractable carbonate bound fiaction. Both amounts of Pb leached from the SCE and modified TCLP tests were much higher than those for the regular TCLP and water extraction tests. The initial particle size of samples have great effect on the leachability of Pb from waste CRTs.
waste cathode ray tubes (CRTs) leaching characteristic identification Pb
Cheng Junhua Zhang Jian Wen Dijiang
Institute of Material Engineering,Yancheng Institute of Technology,Yancheng 224003,China Institute o Nanjing Huanwu Resources Recycling Technology Co.,Ltd,Nanjing 211215,China Institute of Material Engineering,Soochow University,Soohou 215021,China
国际会议
Frist Annual Meeting on Testing and Evaluation of Inorganic Materials(第一届全国无机材料测试与评价学术年会)
南昌
英文
470-474
2010-04-28（万方平台首次上网日期，不代表论文的发表时间）