Use of “oily bubbles” and dispersants in flotation of molybdenite in fresh and seawater
Use of “oily bubbles” and dispersants in flotation of molybdenite in fresh and seawater
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DOI：
10.1016/j.mineng.2020.106197
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发表时间：
2020-03
影响因子：
4.8
通讯作者：
Andrés Ramírez;L. Gutiérrez;J. Laskowski
中科院分区：
文献类型：
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作者：
Andrés Ramírez;L. Gutiérrez;J. Laskowski
辉钼矿 - 与所有固有疏水性矿物一样 - 使用不溶于水的油性捕收剂进行浮选。这种捕收剂可以在水中乳化后用于浮选，但也可以达到颗粒与气泡附着在气泡表面的程度（如油性气泡）。本文试验了碱性环境下油泡和分散剂六偏磷酸钠（SHMP）和硅酸钠（SS）对海水中辉钼矿浮选的影响。结果表明，当在气泡表面供应煤油时，辉钼矿回收率会增加，这对于在 pH > 9.5 的海水中浮选辉钼矿尤为重要。在 pH > 9.5 时，SHMP 分散剂对辉钼矿的回收具有强烈的积极作用，当 pH 值升高以抑制黄铁矿和镁物质以羟基络合物/氢氧化物形式沉淀时，已知该 pH 范围会导致辉钼矿浮选的抑制。油泡和分散剂的综合作用使辉钼矿回收率达到与使用淡水时相似的值。诱导时间测量结果表明，当气泡涂覆一层煤油时，气泡对辉钼矿的附着显着改善。
Molybdenite - as all inherently hydrophobic minerals – is floated with the use of water-insoluble oily collectors. Such collectors can be used in flotation either after emulsification in water, but can also be brought to the point of particle-to-bubble attachment on the surface of bubbles (as oily-bubbles). In this paper we are testing the effect of oily-bubbles and the dispersants sodium hexametaphosphate (SHMP) and sodium silicate (SS) on the flotation of moleybdenite in seawater in alkaline environment. The results show that molybdenite recovery increases when kerosene is supplied on the surface of bubbles which was particularly important in the flotation of molybdenite at pH > 9.5 in seawater. SHMP dispersant had a strong positive effect on the recovery of molybdenite at pH > 9.5, the pH range known to cause depression of the molybdenite flotation when pH is raised to depress pyrite and magnesium species precipitate as hydroxo-complexes/hydroxide. The combined effect of the oily bubbles and dispersants allows for the molybdenite recoveries to reach to similar values to those achieved when using fresh water. The results of induction time measurements indicate that the attachment of bubbles to molybdenite is significantly improved when the bubbles are coated with a layer of kerosene.