六盘水地区煤矸石中重金属淋溶特性研究  

A study on the heavy metal leaching characteristics of coal gangue from Liupanshui City

作　　者：金晶[1] 田玲[1] 吴汉福[1] 

机构地区：[1]六盘水师范学院化学与化学工程系,贵州六盘水553001

出　　处：《环保科技》2017年第2期21-25,共5页Environmental Protection and Technology

基　　金：贵州省教育厅自然科学基金项目(黔教科2009093)

摘　　要：为了解六盘水地区煤矸石中重金属的溶出特性,采用静态浸泡法,探究了煤矸石浸泡时间、浸泡液p H、煤矸石粒径以及固液比对煤矸石中重金属的溶出影响。研究结果表明:在实验条件下,随着浸泡时间增加,重金属Cr、Zn、Cd、Pb溶出量也增大;随着浸泡液p H减小,重金属Zn、Cd、Pb溶出量随之增大,而Cr是先增加后减小;煤矸石粒度越小,重金属溶出量越大;固液比减小,重金属溶出量减小;浸泡液中Cr和Cd的浓度超过了国家地表水环境质量标准(Ⅲ类),而Zn和Pb未超标。In order to understand leaching characteristics of heavy metals in coal gangue from Liupan-shui City, the effects of soaking time, pH , solid - liquid ratio and particle size on the leaching of heavy metals （Cr, Zn , Cd , Pb） were analyzed by applying static immersion method. The results in-dicate that in the static soaking experiment, the amount of leaching heavy metals （Cr, Zn , Cd , Pb ） increase with the increase of soaking time; A n d the amount of leaching heavy metals （Zn , Cd , Pb） increase with the decrease of p H value ; while for heavy metal C r, an increase at first and a decrease later in the experiment was observed. The experiment also showed that the smaller the granularity of coal gangue w a s, the larger amount of leaching heavy metals could be obtained ; and the concentra-tion of leaching heavy metals decreased with decrease of solid to liquid ratio. The concentrations of Cr and Cd exceeded Class IE standards of National Environmental Quality Standards for Surface W a -ter; while Zn and Pb could meet the standards.

关 键 词：煤矸石 淋溶 重金属 溶出特征 

分 类 号：X501[环境科学与工程—环境工程]