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利用机械球磨的方法可以提高天然黄铁矿的活性,通过XRD和TEM对机械球磨后黄铁矿粉末的表面形态和物理性质进行表征。通过批实验的方法探讨在不同的pH,不同的球磨黄铁矿用量,不同的反应时间和温度的条件下黄铁矿对Cr~(6+),Cd~(2+)和Pb~(2+)的去除效果。研究结果表明,金属离子的吸收受到pH的影响,随着pH的升高,3种金属离子的吸附趋势出现了很大的不同。并且在分析pH对反应效果的影响时,需要考虑金属生成沉淀时的pH。同时,随着反应时间和温度的增加,3种金属离子的吸收量都有不同程度的升高。通过实验比较,球磨黄铁矿对Cr~(6+),Cd~(2+)和Pb~(2+)的去除能力大小为Pb~(2+)>Cr~(6+)>Cd~(2+)。纳米级黄铁矿与Cr~(6+),Cd~(2+)和Pb~(2+)的反应过程符合准二级动力学方程。
The mechanical activity of natural pyrite can be increased by mechanical ball milling. The surface morphology and physical properties of the pyrite powder after mechanical ball milling were characterized by XRD and TEM. The effects of pyrite on Cr ~ (6 +), Cd ~ (2+) and Pb ~ (2) under different pH, different amounts of milled pyrite and different reaction time and temperature were investigated by batch experiments. +) Removal effect. The results show that the absorption of metal ions is affected by pH. With the increase of pH, the adsorption trends of the three metal ions appear quite different. And in analyzing the effect of pH on the reaction, the pH at which the metal should form a precipitate needs to be considered. At the same time, with the increase of reaction time and temperature, the uptake of three kinds of metal ions all increased to some extent. Through experimental comparison, the removal capacity of Cr 6+, Cd 2+ and Pb 2+ by ball milled pyrite is Pb 2 + Cr 6 + Cd 2+ ~ (2+). The reaction process of nanometer pyrite with Cr 6+, Cd 2+ and Pb 2+ conforms to quasi-second order kinetic equation.