酸雨对磷矿废石和煤矸石堆体内部酸碱性影响

发布时间：2019-04-19 00:40

【摘要】：矿山废石堆体内部酸碱性变化对治理矿山废石堆体引起的污染有重要指导意义。本文以磷矿废石和煤矸石为例,开展XRD和中和能力(ANC/BNC)测定试验,依据试验结果推算出100年后磷矿废石堆体和煤矸石堆体内的酸碱性。结果表明,1kg磷矿废石需0.~(206)mol HNO_3使之中和,磷矿废石对酸具有较强的缓冲能力,100年内酸雨(p H≈4.5)提供的H+不足以中和磷矿废石中碱性物质,堆体内部水分的p H值将长期维持在自然p H条件(p H≈8.6);煤矸石堆体内部呈酸性(p H≈6.6),1kg煤矸石需0.053mol Na OH使之中和,在酸雨的作用下,废水的酸性会逐渐增强,采用投加碱性中和剂方法能够处理煤矸石产生的酸性废水。
[Abstract]:The change of acid and alkalinity in mine waste rock heap has important guiding significance for controlling the pollution caused by mine waste rock heap. Taking phosphate rock waste rock and coal gangue as an example, the determination of XRD and neutralization capacity (ANC/BNC) was carried out in this paper. According to the test results, the acidity and alkalinity of phosphate rock waste rock and coal gangue heap after 100 years were calculated. The results show that the 1kg phosphate rock waste rock needs to be neutralized by 0.206 mol HNO_3, and the phosphate rock waste rock has a strong buffering ability to acid. Within 100 years, the H supplied by acid rain (p H 鈮，

本文编号：2460437