煤系岩石产酸潜力的索氏淋滤实验评价  

Evaluation of Soxhlet leaching experiment of acid-producing potential of rock from coal-bearing measures

作　　者：赵峰华[1,2] 孙红福[1,2] 刘乃利[1,2] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《中国矿业大学学报》2013年第2期214-220,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(40972110;41102096);国家国际科技合作专项(2012DFG71060);大学生科技创新计划项目(2010-05)

摘　　要：为了准确评价非均质性较强含煤岩系样品的产酸潜力,采用索氏淋滤实验方法对山西省西山煤田石炭二叠纪含煤岩系岩石样品的产酸潜力进行了评价,建立了煤系岩石产酸潜力的索氏淋滤实验评价方法.结果表明:1)淋出液pH值小于7、(Ca+Mg+Mn)/SO24-累积摩尔比小于1的样品被评价为产酸样品,反之被评价为不产酸样品.据此将西山煤田的泥岩、砂岩和菱铁矿等3个样品评价为不产酸样品(淋出液pH>8,(Ca+Mg+Mn)/SO24-累积摩尔比1.99～2.91),2个非均质黄铁矿样品评价为强产酸样品(淋出液pH<3.4,(Ca+Mg+Mn)/SO24-累积摩尔比0.08～0.58);2)基于淋出液SO24-浓度计算的2个非均质黄铁矿样品产酸速率分别为177.1mM[SO24-]/(kg.d)和291.8mM[SO24-]/(kg.d);基于淋出液(Ca+Mg+Mn)浓度计算的砂岩、泥岩和非均质菱铁矿样品酸中和速率为10.73～68.77mM[Ca+Mg+Mn]/(kg.d);3)产酸样品淋出液中SO24-离子累积质量浓度为507～1 681mg/L,Fe离子累积质量浓度为135～753mg/L;不产酸样品淋出液中SO24-离子累积质量浓度小于140mg/L,Fe离子累积质量浓度小于1.2mg/L;4)不产酸样品淋出液的S/Fe摩尔比大于66,2个产酸非均质黄铁矿样品淋出液的S/Fe摩尔比为0.95～3.2;5)样品淋滤过程中产生了赤铁矿、石膏和硬石膏等次生矿物相.In order to accurately evaluate the acid-Producing potential of strong heterogeneity rock from coal-bearing measures, Soxhlet leaching experiment was applied to evaluate acid-pro- ducing potential of Permo-carboniferous coal-bearing measure rock from Xishan Coalfiled of Shanxi Province. Soxhlet leaching experiment method was established for evaluating acid-pro- ducing potential of coal-bearing measure rock. The results are as follows, the rock whose pH value of leachate is less than 7 and the cumulative mole ratio （Ca＋Mg＋Mn）/SO24- of leachate is less than 1 is evaluated as the acid-producing sample, and conversely as the non-acid-produ- cing samples. Accordingly, the samples of mudstone, sandstone and siderite are not acid-pro-ducing samples （leachate pHi8, and （Ca＋Mg＋Mn）/SO^- is from 1.99 to 2.91） ; two inho- mogeneous pyrites samples are strongly acid-producing samples（leachate pHi3.4, （Ca＋Mg＋ Mn）/SO4z- is from 0.08 to 0.58）. Based on the SO24- concentrations of leachate, the acid-producing rate of two inhomogeneous pyrites samples is 177.1 m M[SO42- ]/（kg · d） and 291.8 m M[-SO24-]/（kg ~ d）, respectively. Based on the （Ca＋Mg＋Mn） concentrations of leachate, acid neutralization rates of sandstone, mudstone and inhomogeneous siderite samples is from 10.73 to 68.77 m M[Ca＋Mg＋Mn]j（kg ~ d）. The cumulative concentrations of SO24- and Fe in the leachate of acid-producing samples are ranging from 507 to 1681 mg/L and 135 to 753 rag/L, respectively. For non-acid,producing samples, the cumulative concentrations of SO24- and Fe in the leachate are less than 140 mg/L and 1.2 rag/L, respectively. The mole ratios of S and Fe （S/Fe） in the leachate for non-acid-producing samples are more than 66; for acid-producing inhomogeneous pyrites samples, it is from 0. 95 to 3.2. The secondary mineral phase such as hematite, gypsum and anhydrite were formed during the leaching process.

关 键 词：索氏淋滤实验 产酸速率 酸中和速率 含煤岩系 

分 类 号：X751[环境科学与工程—环境工程]