准东煤层中钠的分布与浸出行为  

Distribution and leaching behavior of sodium in Zhundong coal seam

作　　者：朱川[1,2,3] 曲思建 张景 王越 

机构地区：[1]煤炭科学技术研究院有限公司煤化工分院,北京100013 [2]中国矿业大学(北京)化学与环境工程学院,北京100083 [3]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《煤炭学报》2016年第6期1554-1559,共6页Journal of China Coal Society

基　　金：国家科技支撑计划资助项目(2015BAA04B02)

摘　　要：在准东矿区布点采集上部煤层样、夹矸、下部煤层样等样品,进行逐级化学萃取试验和动态淋滤试验,以分析碱金属钠的赋存形态、分布规律和浸出行为。结果表明,煤层(上部分层样和下部分层样)中总钠含量明显大于夹矸。夹矸中水溶态钠(H_2O-Na)含量仅为1.37 mg/g,但占比82.49%,显著高于上部分层样的65.50%和下部分层样的64.35%。动态淋滤过程中钠离子浓度均呈现先快速下降后趋于平衡的变化趋势,上部分层样中钠的初始浸出速率最高。shrinking core model表明上部分层样、夹矸和下部分层样的浸出动力学速率常数分别为:0.001,0.005和0.002h^(-1)。水溶钠浸出率由大到小的顺序为:夹矸>上部分层样>下部分层样,夹矸达99.62%。经动态淋滤后,上部分层和下部分层煤样品灰分中的Na_2O含量分别降至2.67%和2.06%,低于燃煤锅炉稳定运行对钠含量的要求。The upper seam coal（ US coal）,parting and lower seam coal（ LS coal） were sampled from Zhundong mining area. Chemical extraction experiments and dynamic leaching experiments were carried out to study the occurrence,distribution and leaching behavior of sodium. The results show that the content of total sodium in coal sample（ upper layer and lower layer sample） is obviously higher than that in parting. The content of water soluble sodium（ H_2O-Na）is only 1. 37 mg / g,but which accounts for 82. 49%,significantly higher than 65. 50% of US coal and 64. 35% of LS coal. The concentration of sodium ion fell sharply first,and then shows a trend of balance. The initial leaching rate of sodium in US coal is the highest. Shrinking core model shows that the reaction rate constants of leaching kinetics of the US coal,parting and LS coal are 0. 001,0. 005 and 0. 002 h^-1respectively. The relationship of leaching ratio of H2ONa is： parting〉US coal〉LS coal,and parting of which accounted for 99. 62%. After dynamic leaching experiment,the content of Na2O in US coal and LS coal ash fell to 2. 67% and 2. 06% respectively,which are lower than the requirements of stable operation in coal-fired boiler.

关 键 词：准东煤 NA 赋存形态 动态淋滤 浸出行为 浸出率 

分 类 号：TK16[动力工程及工程热物理—热能工程]