ABSTRACT

In order to tackle the problems of high oily collector consumption and low separation efficiency associated with ultrafine coal slimes, a new collector named high internal phase (HIP) emulsion was prepared. The flotation results showed that the HIP emulsion could significantly reduce the oil consumption by 90% compared with kerosene. The superior performance of HIP emulsion compared to kerosene was attributed to its higher flocculation ability, which was supported by the kinetic flocculation experiment and the Extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) theory calculation. The preconditioning experiment showed that the high-shear pulping could greatly promote the overall flotation rate of HIP emulsion, which was due to the enhanced dispersion of the pasty HIP emulsion in the slurry as confirmed by the rheological measurement. The degradation of flocculation ability of HIP emulsion during high-shear stirring may be attributed to the microstructure damage as supported by the conductivity experiments. The HIP emulsions were proved as a potential economic and efficient collector for the beneficiation of ultrafine and high-ash content coal slimes.

摘要

为了解决与超细煤泥相关的油性捕收剂消耗高和分离效率低的问题，制备了一种新的捕收剂，称为高内相（HIP）乳液。浮选结果表明，与煤油相比，HIP乳液可显着降低油耗90％。与煤油相比，HIP乳液的优异性能归因于其较高的絮凝能力，这得益于动力学絮凝实验和扩展的Derjaguin-Landau-Verwey-Overbeek（EDLVO）理论计算。预处理实验表明，高剪切制浆可以大大提高HIP乳液的总体浮选速率，这是由于流变测量结果证实了糊状HIP乳液在浆液中的分散性增强。在高剪切搅拌过程中，HIP乳液的絮凝能力下降可能归因于电导率实验所支持的微观结构破坏。事实证明，HIP乳液是选矿超细高灰分煤泥的一种潜在的经济高效的捕收剂。