摘要
钼是典型的环境敏感元素,同时也是潜在的稀有金属元素,为了查明钼元素在原煤和煤灰中含量特征及其在固(体)液(体)间的迁移规律,选取陕南石煤及煤灰样为研究对象,利用电感耦合等离子体质谱仪(ICP-MS)分析样品中钼元素含量,通过浸泡实验模拟纯水、酸性、碱性和矿井水4种溶液中石煤及煤灰中钼元素浸出率。结果显示:石煤中钼元素含量为315.4~785.4μg/g,煤灰中钼元素含量675.5~1005.1μg/g,燃烧后钼元素具有向石煤灰中富集(迁移)的趋势;不同类型溶液对石煤中钼元素均呈现不同程度的浸出率,总体特征为酸性溶液中钼元素的浸出率普遍偏低,低于其他3种类型溶液;而石煤灰中钼元素在不同溶液中浸出率不同于石煤样,总体特征为酸性溶液中钼元素的浸出率较高。结合浸出量进一步分析表明,酸性条件抑制了石煤中钼元素的迁出能力,而石煤灰样在酸性溶液中的钼浸出率与浸出量普遍高于其他类型溶液。分析认为,有氧燃烧使有机质释放钼元素、含钼矿热解、对钼的吸附能力等方面发生了变化,导致石煤灰中钼元素的迁移能力有所提升。研究认识具有环境保护和钼元素提取利用双重指导意义。
Molybdenum is a typical environmental sensitive element,and also a potential rare metal element.In order to find out the content characteristics of molybdenum in raw stone coal and coal ash and the migration rule between solid and liquid,stone coal and coal ash in southern Shaanxi Province were selected as the research object,and the molybdenum content in samples was analyzed by ICP-MS.To analyse the leaching rate of molybdenum from stone coal and coal ash in four different liquids,pure water,scid,alkaline and mine drainage were selected to simulate soaking experiment.The results show that the content of Mo is 315.4-785.4μg/g in stone coal and675.5-1005.1μg/g in coal ash,which shows that Mo tends to migrate to coal ash from coal after combustion.Different types of solutions presented different leaching rates of molybdenum in stone coal samples,and the overall characteristics were that the leaching rate of molybdenum in acidic solutions was generally lower than that in other three types of solutions.Different types of solutions also present different leaching rates of molybdenum in coal ash samples,and the overall characteristic is that the leaching rate of molybdenum in acid solution is higher,which is obviously different from that in stone coal samples.Further analysis of combined leaching amount shows that the acid conditions inhibited the emigration ability of molybdenum in stone coal,while the leaching rate and the leaching amount of stone coal ash in acid solution were generally higher than that in other solutions.It is believed that aerobic combustion results in the release of molybdenum from organic matter,the pyrolysis of molybdenum-containing ore,and the adsorption capacity of molybdenum resulted in the improvement of the migration capacity of molybdenum.The findings of the research have double guiding significance for environmental protection and extraction&utilization of molybdenum.
作者
张卫国
李焕同
王峰
杨甫
滕金祥
ZHANG Weiguo;LI Huantong;WANG Feng;YANG Fu;TENG Jinxiang(College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation,Xi’an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi’an 710021,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2020年第2期64-70,共7页
Coal Geology & Exploration
基金
国家自然科学基金项目(41802187)
陕西省教育厅科研计划项目(18JK0521)
陕西省煤炭绿色开发地质保障重点实验室基础研究计划项目(MTy2019-09)。
关键词
石煤
石煤灰
钼
迁移规律
浸泡实验
陕南
stone coal
coal ash
molybdenum
migration law
soaking experiment
southern Shaanxi Province
作者简介
第一作者:张卫国,1985年生,男,河北保定人,硕士,工程师,研究方向为煤的微量元素地球化学.E-mail:zhangwg0224@163.com。
