氟硅酸铵在赤铁矿与霓石分离中的作用机理  

Study on Mechanism of Ammonium Fluorosilicate in Separation of Hematite from Aegirine

作　　者：梅光军[1] 李树元[1] 金玉健[1] 余永富[1] 

机构地区：[1]武汉理工大学

出　　处：《金属矿山》2005年第4期20-23,共4页Metal Mine

基　　金：国家自然科学基金项目(59874021)。

摘　　要：研究了以油酸钠为捕收剂浮选赤铁矿时,氟硅酸铵对含铁硅酸盐脉石矿物霓石的选择性抑制作用。纯矿物浮选试验结果表明,在pH4～5的弱酸性条件下,氟硅酸铵对赤铁矿浮选的影响较小,而对霓石强烈抑制,从而能够实现两种矿物的浮选分离。通过红外光谱(IR)与光电子能谱(XPS)分析测试,发现(NH4)2SiF6在霓石矿物表面以化学吸附作用为主,并提出了SiF2-6在两种矿物表面的理论吸附模型,首次运用配位化学的观点合理解释了氟硅酸铵选择性抑制含铁硅酸盐矿物的根本原因。The selective depression of ammonium fluorosilicate on aegirite, an iron-containing silicate gangue mineral, in hematite flotation using sodium oleate collector was investigated. The results of single minerals flotation test showed that at pH 4~ 5 representing a weakly acidic condition, ammoniun fluorosilicate had little effect on hematite flotation but could strongly depress aegirite, realizing a separation of the two minerals by flotation. It was found by IR and XPS spectrum analysis that the chemical adsorption of (NH_4)_2SiF_6 on aegirite was the main adsorption mode. A theoretical model for SiF^2+ _6 adsorption on both mineals is proposed, which reasonably interprets the radical cause for the selective depression of SiF^2- _6 for iron-containing silicate using for the first time the coordination chemistry.

关 键 词：氟硅酸铵 赤铁矿 霓石 浮选分离 

分 类 号：TD95[矿业工程—选矿]