煤矸石酸性潜能静态预测试验研究

Experiment Study on Coal Gangue Acid Potential Prediction

煤矸石自身酸碱性是判断煤矸石堆体能否发生酸性矿山排水的重要依据,为了探究阜新市海州立井矿煤矸石产酸潜能,开展了酸碱计算法试验(ABA)、净产酸量试验(NAG)、酸/碱中和能力试验(ANC),结果表明:煤矸石的NP/AP<1,NAG p H<4.5,煤矸石具有低产酸潜能,对碱具有一定的中和能力;ANC试验结果显示煤矸石自然p H值呈弱酸性,1 kg煤矸石约需要0.090 mol碱使之中和,ANC试验结果体现的是稳定状态下全部废石的缓冲能力,净产酸量小于另外两种方法;海州立井矿主要产出低硫煤,煤矸石中硫含量不高,碳酸盐硅酸盐等碱性矿物能够中和一部分酸,加之雨水淋滤风化等作用,发生酸性矿山排水的危险性较小。

Acid and alkaline gangue is the judgment of coal gangue heap body can be important basis of acid mine drainage, In order to explore Fuxin haizhou lijing coal waste rock pile acid potential, carried out acid and alkali（ABA）, net acid production generation（NAG）, acid/alkali neutralization capacity test（ANC）. Results show that the waste rock NP/AP is less than 1, NAG p H is less than 4.5. Coal gangue has low acid potential and alkali neutralization capacity. ANC test results show that 1 kg coal gangue gets neutral by 0.090 mol alkali. Test results means the steady state of all the buffering capacity of waste rock. So ANC method for acid amount is less than the other two methods. Fuxin haizhou lijing mine puts out lowsulfur coal mine.Sulfur content in coal gangue is not high,and carbonate silicate alkaline minerals can neutralize acid. By rainwater leaching action and weathering, acid mine drainage is little dangerous.