中文摘要：

通过用不同pH的3%双氧水分别浸泡原始尾矿和聚硅氧烷包膜处理尾矿,研究了包膜剂浓度,浸泡时间,浸泡介质pH对尾矿中重金属溶出的影响,并利用红外光谱法对改性前后的尾矿进行表征.结果表明选择包膜剂浓度为10%—15%时效果最佳;在3%的双氧水中浸泡1周的时间内,包膜剂对尾矿中重金属离子的溶出都有较大影响,抑制Cr、Mn、Cu的溶出,加速Fe的溶出,但随着浸泡时间的延长,这种影响减弱;随着浸泡介质pH的变化,尾矿中Cr、Mn、Cu、Fe金属离子呈现不同的浸出规律,但实验结果显示包膜剂在酸性介质中具有更好的效果.包膜处理尾矿的红外光谱图上出现了聚硅氧烷的特征吸收峰,证实了包膜处理尾矿表面确实形成了聚硅氧烷层.

英文摘要：

The potential of polyorganosiloxane coating to inhibit heavy metal release from pyrrhotite tailings has been studied through static soaking experiments.Each sample,original or coated with polyorganosiloxane,was exposed to 3% H2O2 with different pH for specified oxidation period.The effect of polyorganosiloxane concentration,soaking time and pH on heavy metal release was studied.Infrared spectroscopy was used to analyze the pyrrhotite surface.Results showed that the optimal coating concentration was 10%—15%.During one week soaking period,the coating had great impact on heavy metal release.The coating inhibited the release of Cr,Mn and Cu,but accelerated the release of Fe.As the pH varied,each heavy metal had different leaching behaviour.The experimental result indicated polyorganosiloxane had better effect under acidic condition.The characteristic absorption peaks of polyorganosiloxane were found in the infrared spectrum of the coated samples,indicating that a polyorganosiloxane film had formed on the tailing surface.