低阶煤中矿物组分与矿井水的协同效应

Synergistic effect of mineral components and mine water in low-rank coal

目的:针对目前我国煤炭废弃物的综合利用效率较低的问题,本文旨在研究水库煤柱坝体对矿井水水质演化的影响。方法:本文以乌兰木伦煤矿低阶煤中的长焰煤和不同矿井水源为例,通过室内静态浸泡实验模拟煤-水相互作用过程,从水化学组分的角度,采用相关性分析、因子分析等统计方法,探讨长焰煤影响下不同矿井水水质演变的控制因素。结果:经过分析得到:四类水样初始水化学类型不一致,反应后演化成HCO_(3)-SO_(4)-Na-Ca型和SO_(4)-HCO_(3)-Na-Ca两种水化学类型,且四类水样主控因素分析的累计方差贡献率分别为82.52%、80.07%、80.68%、80.02%,均满足累积方差贡献超过80%的原则。结论:长焰煤在地表水和地下水中存在不同的影响作用,煤-水协同效应主要包括各种矿物的溶解(碳酸盐岩、硅酸盐岩、硫酸岩盐等)和阳离子交换,地表水和地下水水质演化的主要因素分别是碳酸盐矿物的溶解和阳离子交换。

Purpose:Aiming at the problem of low comprehensive utilization efficiency of coal waste in China,this paper aims to study the influence of reservoir coal pillar dam on the evolution of mine water quality.Method:In this paper,the long-flame coal and different mine water sources in the low-rank coal of Wulanmulun coal mine are taken as an example.The coal-water interaction process is simulated by the indoor static immersion experiment.From the perspective of water chemical composition,correlation analysis,factor analysis,and other statistical methods are used to explore the control factors of different mine water quality evolution under the influence of long-flame coal.Result:After analysis,it was found that the initial hydrochemical types of the four types of water samples were inconsistent,and evolved into HCO_(3)-SO_(4)-Na-Ca type and SO_(4)-HCO_(3)-Na-Ca type after reaction.The cumulative variance contribution rates of the main control factors of the four types of water samples were 82.52%,80.07%,80.68%,and 80.02%,respectively,which all met the principle that the cumulative variance contribution exceeded 80%.Conclusion:Long flame coal has different effects on surface water and groundwater.The synergistic effect of coal-water mainly includes the dissolution of various minerals(carbonate rock,silicate rock,sulfate rock salt,etc.)and cation exchange.The main factors of surface water and groundwater quality evolution are the dissolution of carbonate minerals and cation exchange,respectively.