不同配比和粒度下黄铁矿和石灰石静态浸泡试验

Static Soaking Test of Pyrite and Limestone at Different Proportions and Particle Sizes

为进一步探究巩义矿区黄铁矿致酸的特征和规律,研究该地区中和法处理酸矿水的最佳方案,以3种粒径的黄铁矿分别与不同比例的石灰石进行混合浸泡试验,分析浸泡液的pH、TDS、Con与阴阳离子浓度变化,并分析反应前后岩样的矿物组成与孔参变化。结果表明:(1)巩义矿区黄铁矿浸泡后可生成大量SO_(4)^(2-),浸泡液中其值超过地下水Ⅲ类水标准;(2)黄铁矿比例越高,浸泡液pH越低,析出阴阳离子浓度越高,比表面积及孔隙度变化越大,且随浸泡时间延长,浸泡液酸性逐渐下降,说明石灰石中和作用在缓慢发挥,加入25%~50%石灰石即可以中和酸性水。

In order to make further investigation for the characteristics and patterns of acidogenicity of pyrite in the Gongyi mining area,and to study the best solution for the treatment of acid mine water by neutralisation method in the area,a mixed leaching experiment was conducted with three grain sizes of pyrite and different proportions of limestone respectively,and the changes in pH,TDS,Con and anion concentration of the leaching solution were analyzed,as well as the changes in mineral composition and pore reference of the rock samples before and after the reaction.Results showed that:(1)Large amounts of SO_(4)^(2-) could be generated from the leaching of pyrite in the Gongyi mine,and its value in the leaching solution exceeded the classⅢgroundwater standard.(2)The higher the proportion of pyrite,the lower the pH of the soaking solution,the higher the concentration of precipitated anions and cations,and the greater the changes in specific surface area and porosity;and the acidity of the soaking solution gradually decreased with the extension of the soaking time,indicating that the neutralizing effect of limestone was slowly exerted,and the addition of 25%~50%limestone could neutralize acidic water.