摘要
采用静态模拟试验方法,从含硫量不同的煤矸石的理化性质分析了煤矸石自身氧化产酸产碱规律。煤矸石氧化产酸是一个产酸产碱并存的过程,产酸过程主要是由硫化矿物的化学氧化控制,产碱过程则是碱性矿物溶解造成的酸度中和以及发生在某些硅酸盐矿物表面的因离子溶出而发生的质子交换。煤矸石的产酸阶段可以分为快速产酸期和稳定产酸期,产碱阶段可以分为快速产碱期和慢速产碱期。试样1煤矸石体系0~48 h为快速产酸期,产酸速率1.889 mmol/(kg·h),此后进入稳定产酸期,稳定产酸速率为0.012 mmol/(kg·h);0~24 h为快速产碱期,产碱速率1.594 mmol/(kg·h),之后产碱速率降为0.013 mmol/(kg·h)。试样2煤矸石体系的产酸产碱过程以48小时为转换点,快速产酸速率为0.243 mmol/(kg·h),稳定产酸速率为0.008 mmol/(kg·h);快速产碱速率为1.008 mmol/(kg·h),慢速产碱速率为0.033 mmol/(kg·h)。
Based on the physical and chemical properties of coal gangue with different sulfur content, the law of coal gangue oxidation to produce acid and alkali was analyzed by static simulation test.Coal gangue oxidation acid production is a coexisting process of acid and alkali production.The acid production process is mainly controlled by the chemical oxidation of sulfide minerals, and the alkali production process is the acidity neutralization caused by dissolution of alkaline minerals and proton exchange that occurs on the surface of some silicate minerals due to ion dissolution.The acid production stage of coal gangue can be divided into rapid acid production period and stable acid production period, and its alkali production stage can be divided into fast alkali production period and slow alkali production period.Sample No.1 coal gangue system is a rapid acid production period from 0 to 48 hours, and its acid production rate reaches 1.889 mmol/(kg·h),and then enters a stable acid production period with acid production rate of 0.012 mmol/(kg·h);0 to 24 hours is the period of rapid alkali production, the alkali production rate is 1.594 mmol/(kg·h),and then the alkali production rate drops to 0.013 mmol/(kg·h).The acid production and alkali production process of sample No.2 coal gangue system takes 48 hours as the transition point, the rapid acid production rate is 0.243 mmol/(kg·h),and the stable acid production rate is 0.008 mmol/(kg·h);The rate of rapid and slow alkali production is 1.008 mmol/(kg·h)and 0.033 mmol/(kg·h)respective.
作者
凤阳
孟庆俊
颜淑慧
李向东
冯启言
FENG Yang;Meng Qing-jun;YAN Shu-hui;LI Xiang-dong;FENG Qi-yan(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2023年第1期110-116,124,共8页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点研发计划项目(2019YFC1805001)
国家自然科学基金资助项目(41977159)。
关键词
煤矸石
酸度
碱度
反应速率
黄铁矿
方解石
coal gangue
acidity
alkalinity
reaction rate
pyrite
calcite
