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在由巴西CVRD公司Taquari Vassouras矿山钾盐矿石制备的盐水溶液中进行了粗粒KCl浮选试验,以确定在高浓度Mg2+存在时,钾盐的可浮性。在将Mg2+添加到盐水中时,会产生细粒盐沉淀物,它们主要由NaCl(90%以上)组成,但也有KCl存在。将Mg2+添加到浮选给矿中会在粗粒KCl表面上产生NaCl和KCl细粒晶核。这种表面细粒晶体在粗粒KCl表面上的晶核化可以提高粗粒KCl的浮选回收率。但是,盐水中的细粒晶体沉淀物(主要是NaCl,也有一些KCl)会与粗粒KCl竞争吸附捕收剂,使粗粒KCl的可浮性降低。在捕收剂添加前,将这些沉淀物除去,就可大幅度增加粗粒KCl对捕收剂的吸附量,从而大幅度提高粗粒KCl的浮选回收率。
A coarse KCl flotation test was performed in a brine solution prepared from the potassium salt of the Taquari Vassouras mine, CVRD, Brazil to determine the floatability of the potassium salt in the presence of high levels of Mg2 +. When Mg2 + is added to the brine, fine-grained salt precipitates are produced, which are mainly composed of NaCl (90% or more), but there is also KCl present. The addition of Mg2 + to the flotation feed will produce fine-grained NaCl and KCl nuclei on the surface of the coarse-grained KCl. The nucleation of such surface fine crystals on the surface of coarse KCl can increase the flotation recovery of coarse KCl. However, fine-grained crystal precipitates (mainly NaCl and some KCl) in the brine will compete with the coarse KCl for the adsorption collector to reduce the buoyancy of the coarse KCl. Removing these precipitates before the collector is added can greatly increase the amount of collector adsorbed by the coarse KCl, thereby greatly improving the flotation recovery of the coarse KCl.