【作者】 陈臣；

【导师】 孙伟；

【作者基本信息】 中南大学 ， 矿物加工工程， 2011， 硕士

【摘要】 白钨矿资源丰富,是工农业生产和国防建设所需要的重要原料,但白钨矿一般与萤石、方解石和磷灰石等含钙盐类矿物共生,它们之间表面性质相似、溶解组分作用复杂以及存在矿物表面的相互转化现象,导致含钙盐类矿物的浮选分离困难,难以高效回收利用。本论文以三种典型含钙盐类矿物为研究对象,即白钨矿、萤石和方解石,通过单矿物浮选试验、白钨矿实际矿石浮选试验、Zeta电位测定、吸附量测定以及浮选溶液化学计算,研究了在油酸钠作捕收剂体系下F-、CO32-、WO42-和Si032-(包括模数1和模数2.4)对白钨矿、萤石和方解石浮选行为的影响,揭示了这些无机阴离子与三种含钙矿物表面的作用机理。单矿物浮选试验的结果表明：F-、C032-、和W042-在一定的浓度范围内,对白钨矿和方解石的的浮选行为有一定的活化作用,而对萤石的活化效果不明显；模数1的Si032-在低浓度时,对三种含钙矿物均有一定的活化作用,高浓度时,对三种含钙矿物表现出抑制作用；模数2.4的Si032-在低浓度时,仅对白钨矿浮选有活化作用,高浓度时,对白钨矿表现出抑制作用,而对萤石和方解石在整个试验浓度范围内都有很强的抑制作用。两种模数的Si032-对三种含钙矿物抑制能力大小顺序一致,为萤石>方解石>白钨矿。通过单矿物浮选试验得到的结论,在白钨矿的实际矿石浮选中,添加适量的碳酸钠和模数2.4的水玻璃,成功实现了白钨矿和萤石、方解石的浮选分离,最终获得了含W0360.08%,回收率70.38%的白钨精矿。矿物表面Zeta电位测试和捕收剂吸附量测试结果表明：F-在三种含钙矿物表面的吸附较弱,对矿物表面电性和矿物表面捕收剂吸附的影响较小；CO32-、WO42-和两种模数Si032-在三种矿物表面发生了较强的特性吸附；在一定的浓度范围内,CO32-、WO42-和模数1的Si032-对油酸钠在三种含钙矿物表面的吸附有一定的增强,模数2.4的Si032-仅对白钨矿表面油酸钠的吸附有一定的增强,而萤石和方解石表面的油酸钠吸附量都随着模数2.4的Si032-浓度增加而急剧下降。三种含钙矿物溶解行为研究和浮选溶液化学计算结果表明：在高碱性条件下,油酸钠主要通过与矿物表面Ca2+发生化学键合作用来浮选三种含钙矿物；无机阴离子对三种含钙矿物浮选行为的活化作用是因为降低了Ca2+沉淀捕收剂的作用,增强了矿物表面与捕收剂的相互作用,提高了矿物的浮选回收率；Si032-起抑制作用时,其主要成分为活性硅酸胶体,通过吸附在矿物表面,增强了矿物表面亲水性,从而降低矿物的可浮性。更多还原

【Abstract】 Scheelite abounds in resources, which are essential materials of industry, agriculture and national defense. However, scheelite, fluorite and apatite commonly constitute mineral intergrowth, the similarity among the natures of the minerals, the complicated interactions among the dissolved species and the mutual transformation between the mineral surfaces, which could account for the difficulty of the separation of calcium salt minerals and high-efficiency. In this thesis, three typical calcium salt minerals regarded as the research object, namely, scheelite, fluorite and calcite, by doing single mineral flotation tests, scheelite ore flotation tests, Zeta potential measurement, determination of adsorption magnitude and flotation solution chemical calculation in the system that using sodium oleate as collector, the investigation that different modules of F", CO32-, WO42- and SiO32-(module 1 and module 2.4) could responsible for the vary flotation behavior of scheelite, fluorite and calcite has been carried out, which also exploded the interrelation between those anions and the surfaces of these three minerals.According to the results of the single mineral flotation tests, F-, CO32-, and WO42- could activate the scheelite and calcite within a certain range of concentration, while they don’t have distinct activation to fluorite. With low concentration of SiO32-(module 1), the activation takes place to all these three minerals to some degree, while enhancing the concentration of SiO32- (module 1), it shows depression to those minerals. With low concentration of SiO3- (module 2.4), the activation to scheelite takes place, while depression to scheelite is shown with high concentration of SiO32-(module 2.4). Meanwhile, SiO32-(module 2.4) shows strong depression to fluorite and calcite within the whole range of concentration. The depressive capability of SiO32-(module 1 and module 2.4) to these three minerals is accordant:fluorite> calcite> scheelite.Another conclusion could be drawn from the single mineral flotation teats is, during scheelite ore flotation, the scheelite could be successfully separated from fluorite and calcite by adding proper amount of sodium carbonate and sodium silicate (module 2.4). By adopting this way of flotation, the scheelite concentrates which grade of WO3 is 60.08% and recovery is 70.38% are finally being obtained.The tests of zeta potential and the adsoption magnitude of collector at the mineral surface show that:the adsorption of F- to the calcium minerals is relatively weak and it only has slight influence over the surface charge and the adsorption of collectors of the mineral surface. CO32-、WO42- and SiO32-(module 1 and module 2.4) generate relatively strong specific adsorption to all the three minerals. Within a certain concentration range of CO32-、WO42- and SiO32-(module 1), the adsorption between sodium oleate and these three calcium minerals could be enhanced, while the adsorption of sodium oleate to fluorite and calcite would be rapidly reduced with the enhance of concentration of SiO32-(module 2.4).The dissolution behavior research and the calculation of solution chemistry of flotation of these three calcium minerals show that:sodium oleate float these calcium minerals mainly by the chemical-bond between sodium oleate and Ca2+ at the mineral surface in the highly alkaline conditions. The activation of inorganic anions to the flotation behavior of the calcium minerals is due to the chemical reaction which declined the capability of Ca2+ as precipitator of collectors, enhanced the interaction between the collectors and the mineral surface, and increased the recovery of minerals. While SiO32- is used as depressor, its main ingredient is active silica colloid. It reduces the minerals’floatability by the adsorption at the mineral surface which could improve the hydrophilic property of mineral surface.更多还原