DL-苹果酸对白云母可浮性的抑制机理

摘要

The effect of DL-malic acid on the floatability of muscovite was investigated under so-dium oleate system, and the mechanism of DL-malic acid on muscovite was researched by means of FTIR and XPS spectra etc.The results show that floatability of muscovite can be prominently in-hibited by DL-malic acid, because C4H5O5-and C4H4O52-which from DL-malic acid solution could occur competitive adsorption with oleate ions in the pulp, and C4H5O5-and C4H4O52-which ad-sorbed on muscovite surface aroused its surface zeta potential negative direction increase, which caused the electrostatic adsorption action of oleate ions in muscovite surface was weakened.Moreover, C4H5O5-and C4H4O52-contain strong hydrophilic groups, these ions of which adsorbed on muscovite surface caused its surface had hydrophilicity, therefore the floatability of muscovite was inhibited.%在油酸钠体系下研究了DL-苹果酸对白云母可浮性的影响,采用FTIR和XPS等方法研究了DL-苹果酸与白云母的作用机理.结果表明,DL-苹果酸可显著抑制白云母的可浮性,DL-苹果酸在溶液中生成的C4H5O5-、C4H4O52-等离子与矿浆中的油酸根等离子发生竞争吸附,并且C4H5O5-、C4H4O52-等离子吸附在白云母表面会导致白云母表面的ζ电位负向增大,进而会削弱油酸根等离子在白云母表面的静电吸附作用.此外,含有羟基等强烈亲水基团的C4H5O5-、C4H4O52-等离子吸附在白云母表面会使白云母表面亲水,因此白云母的可浮性受到抑制.