Mechanochemical Sulfidation of Heavy-Metal Containing Waste Residue for Stabilization
Study of the sulfidation process in heavy metals is of particular interest due to the fact that the formation of metal sulfide can achieve not only the stabilization of the heavy metals, but also the recovery of the metal sulfide through flotation. In order to obtain better stabilization effects, mechanical activation was used as a method to promote the sulfidation of the heavy metals in the sludge. The results indicated that the amount of the sodium sulfide and the sulfidation time were reduced through the mechanical effects. Evaluated by leaching toxicities of the main contained heavy metals, zinc and cadmium, the optimal conditions were obtained as follows: sodium sulfide solution concentration 200g/L, the ratio of ball to material 3.3:1, the liquid-solid ratio 2.75:1(mL/g), and the reaction time 1h. Under these conditions, the leaching toxicities of the zinc and cadmium can reduce from 1547mg/L and 104.4mg/L to 2.85mg/L and 0.77mg/L, respectively. The classic TCLP analyses showed that the other heavy metals’ leaching toxicities can also reached the identification standards.
Xiao-bo MIN Shao-hui YANG Li-yuan CHAI Yan-jie LIANG Hui-min WANG
School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
国际会议
The Fifth International Conference on Waste Management and Technology(第五届固体废物管理与技术国际会议)
北京
英文
555-558
2010-11-01（万方平台首次上网日期，不代表论文的发表时间）