ABSTRACT

The flotation of low-quality lignite coal in the presence of NaCl, MgCl₂ and CaCl₂ inorganic salts with/without the use of kerosene and MIBC as flotation chemicals was investigated in this study. In addition, the zeta potential and contact angle measurements were performed. The lignite sample exhibited a negative surface charge over a broad pH range and had no isoelectric point (iep). It was determined that the magnitude of negative charge significantly decreased above 10⁻² M concentration of the salts and the flotation of lignite without flotation reagents also started to take place at concentrations higher than the same value. The contact angles measured on the lignite surfaces also increased with increasing salt concentration. The lignite sample was hydrophilic, and therefore very difficult to float. Consequently, the flotation of lignite with collector and frother was not achieved to the desired extent, even using high reagent concentrations. In the absence of flotation chemicals, high concentrations of these salts also provided low flotation performances. However, the flotation of lignite could be achieved with kerosene and MIBC in the presence of inorganic salts. In addition, it was determined that MgCl₂ and CaCl₂ salts were more effective on the lignite flotation than NaCl salt.

摘要

_{本研究研究了在 NaCl、MgCl 2}和 CaCl ₂无机盐存在下，使用/不使用煤油和 MIBC 作为浮选化学品的低质量褐煤的浮选。此外，还进行了 zeta 电位和接触角测量。褐煤样品在较宽的 pH 范围内显示出负表面电荷，并且没有等电点 (iep)。确定负电荷的量级显着降低到 10 ^-2以上 盐的 M 浓度和没有浮选剂的褐煤浮选也开始发生在高于相同值的浓度下。在褐煤表面上测量的接触角也随着盐浓度的增加而增加。褐煤样品是亲水的，因此很难漂浮。因此，即使使用高浓度的试剂，用捕收剂和起泡剂浮选褐煤也没有达到预期的程度。在没有浮选化学品的情况下，高浓度的这些盐也提供了低浮选性能。然而，在无机盐的存在下，煤油和 MIBC 可以实现褐煤的浮选。此外，测定了 MgCl ₂和 CaCl ₂盐对褐煤浮选比氯化钠盐更有效。