摘要
以某冶炼厂污酸处理后形成的硫化渣和石膏渣为原料,在分析浸出毒性和抗压性能的基础上,探讨硫固定的工艺条件。研究结果表明:硫化渣的浸出毒性比石膏渣的浸出毒性强,其中Zn和Cd的浸出质量浓度分别为1 547.0 mg/L和104.4 mg/L;增加硫磺用量和添加石膏渣有利于降低其浸出质量浓度;利用1 mol/L硫化钠溶液进行预处理,固化体中的Zn和Cd浸出质量浓度分别为1.74 mg/L和0.87 mg/L,低于危险废物浸出毒性鉴别标准(GB 5085.3—2007);当硫化渣粒径小于150μm,石膏渣用量为20%,骨料用量为15%时,固化体的抗压强度达到最大值47.5 MPa,根据混凝土强度检验评定标准(GBJ 107—87),达到C47混凝土强度等级。
Based on the analysis of the leaching toxicity and compressive strength,the sulfuration slag and gypsum slag which were produced during the treatment process of waste acid in a smelter,were used as experimental materials.The optimal conditions for sulfur immobilization were studied.The results show that the leaching rate of sulfuration slag is higher than that of gypsum slag,and the leaching toxicity of zinc and cadmium is 1 547.0 mg/L and 104.4 mg/L,respectively.Increasing of sulfur content and adding of gypsum slag are beneficial to the decrease of leaching toxicity.The concentration of zinc and cadmium in the leachate of the solidified body is 1.74 mg/L and 0.87 mg/L respectively with a pretreatment of sodium sulfide at the concentration of 1 mol/L,which is lower than the identification standards of leaching toxicity for hazardous wastes（GB 5085.3-2007）.When the particle size of sulfuration slag is less than 150 μm,the gypsum slag adding ratio is 20% and the aggregate adding ratio is 15%,and the compressive strength of solidified body will reach the maximum value as 47.5 MPa,which reaches the level of C47 concrete strength according to the standard of inspection and assessment of concrete strength（GBJ 107-87）.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第11期3262-3269,共8页
Journal of Central South University:Science and Technology
基金
国家杰出青年科学基金资助项目(50925417)
国际科技合作项目(2008NR1181)
湖南省科技重大专项(2009FJ1008
2008SK1002)
国家高技术研究发展计划("863"计划)项目(2010AA065203)
教育部新世纪人才支持计划项目(ncet-10-0840)
关键词
硫固定法
重金属废渣
浸出毒性
抗压强度
sulfur immobilization
heavy-metal containing waste residue
leaching toxicity
compressive strength
