菱铁矿和白云石对石英浮选的影响

Effect of Siderite and Dolomite on Flotation of Quartz

通过浮选试验、吸附量测定和溶液化学计算研究了油酸钠浮选体系下菱铁矿和白云石对石英浮选的影响.浮选试验和吸附量测定结果表明:菱铁矿对石英浮选的影响与其溶解组分有关,当淀粉存在时,菱铁矿可显著影响石英浮选;白云石的溶解组分对石英浮选的影响较小,增大油酸钠用量可在一定程度上消除白云石的影响.溶液化学计算表明,菱铁矿的溶解组分可将活化的石英表面转化为易被淀粉抑制的CaCO_3沉淀,而白云石的溶解会受到浮选体系中钙离子的抑制,这也是菱铁矿和白云石溶解对石英浮选的影响存在差异的主要原因.

Flotation test,adsorption test,and solution chemical calculations were used to investigate the effect of siderite and dolomite on quartz flotation in sodium oleate flotation system.The results of flotation and adsorption tests showed that the effect of siderite on quartz flotation is related to the dissolved siderite species and starch,and siderite significantly influences flotation of quartz in the presence of starch.The negative effect of dolomite on quartz flotation could be whittled by increasing the dosage of sodium oleate.The solution chemical calculations indicated that dissolved siderite species might convert the initial surface of active quartz to CaCO_3 precipitates which can be easily depressed by starch,while the dolomite dissolution is restrained by calcium ions in the solution,which might explain the difference of effects on quartz flotation between dissolved siderite species and dissolved dolomite species.