摘要:
矿泥和过稳定泡沫一直是困扰氧化锌矿硫化-铵盐浮选过程的难题.在硫化-胺盐浮选体系中开展了气-液两相和气-液-固三相的泡沫稳定性试验,选取石英、方解石和褐铁矿作为典型矿泥,考察了十二胺用量、硫化钠用量、pH值、矿泥种类和粒度对泡沫稳定性的影响,分析了矿泥对泡沫稳定性影响的内在机理.结果表明:随着十二胺用量的增大,最大泡沫高度和半衰期逐渐增大,泡沫稳定性逐渐增强;随着硫化钠用量的增大,最大泡沫高度和半衰期先增大后减小,泡沫稳定性先增强后变差;相同条件下三相泡沫的最大高度和半衰期明显大于两相泡沫,矿泥对泡沫稳定性具有显著的强化作用,而且这种强化作用随着矿泥的粒度减小而逐渐增强,不同种类矿泥对泡沫稳定性增强作用大小关系为褐铁矿>方解石>石英.
Abstract:
The zinc oxide ore flotation process using ammonium sulfide is troubled with the problems of the slime and the foam stability.The foam stability experiment with gas-liquid two phase and gas-liquid-solid three phase was carried out in ammonium sulfide flotation system.Quartz, calcite and limonite were selected as the typical slime.The effect of dodecyl amine dosage, sodium sulfide dosage, pH, slime type and size on foam stability was investigated.The influence mechanism of slime on the foam stability was also analyzed.The results showed that the foam stability, namely maximum height and half-life, increased with the dosage of dodecyl amine.The maximum height and half-life firstly increased and then decreased with the dosage of sodium sulfide.The maximum height and half-life of gas-liquid-solid three phases were clearly higher than those of gas-liquid two phases.It indicated that slime enhanced the foam stability and the enhancement effect increased with the decrease of the slime size.The relative order of enhancement effect on foam stability for the three kind of slime was given: limonite>quartz>calcite.
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