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针对目前铜钼浮选分离所使用的传统黄铜矿抑制剂存在毒性大、对环境污染严重等问题,开发出新型辉钼矿的抑制剂以实现铜钼的有效分离具有重要的意义。本文拟开发黄腐酸(FA)作为新型高效的辉钼矿抑制剂,通过单矿物浮选试验和人工混合矿浮选试验探究抑制剂浓度、矿浆pH、捕收剂浓度等因素对黄铜矿和辉钼矿可浮性及铜钼分离效果的影响,并采用FTIR和Zeta电位表征手段探究FA在黄铜矿和辉钼矿表面的吸附行为。浮选试验结果表明,FA在pH为4~12的范围内能够有效地抑制辉钼矿的浮选,而对黄铜矿的浮选影响不大;FA能够显著地扩大辉钼矿和黄铜矿之间可浮性的差异。在pH为9,FA浓度为200mg/L,SIBX浓度为20mg/L条件下,人工混合矿试验取得了较好的结果,黄铜矿回收率高达70.20%,辉钼矿回收率仅有16.83%。FTIR和Zeta电位结果表明,FA能够克服静电斥力吸附在辉钼矿表面,并且FA与SIBX在黄铜矿表面存在竞争吸附,SIBX能够取代黄铜矿表面已吸附的FA,使其表面恢复疏水性,而SIBX几乎不影响FA在辉钼矿表面的吸附,使辉钼矿表面保持亲水性,从而能够实现铜钼的有效分离。 相似文献
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本文通过浮选试验、ζ-电位和吸附测定,研究了水玻璃对萤石、赤铁矿浮选分离的作用机理。结果表明,水玻璃在溶液中的溶解度和离子组成与溶液浓度、pH值和硅钠比有关;在pH6—9时,赤铁矿、萤石对水玻璃各种离子的吸附活性不同,从而实现两种矿物的分离。 相似文献
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萤石是氟化学工业的重要原料。随着易选萤石矿的逐渐枯竭,难选伴生型萤石矿的资源利用越来越受到重视。由于萤石和方解石的表面物理化学性质相似,方解石型萤石矿的分离一直是选矿界的难题。通过单矿物浮选试验、吸附量测定、Zeta电位测量以及浮选溶液化学计算,研究了ZnSO4?7H2O与水玻璃组合抑制剂对萤石、方解石浮选分离的影响及其机理。浮选试验结果表明,相对于水玻璃,Zn-水玻璃(ZnSO4?7H2O与水玻璃混合物)对方解石的选择性抑制效果远大于萤石,可以达到两种矿物的有效分离。吸附量测定、Zeta电位测量和浮选溶液化学计算结果表明,Zn2+与水玻璃混合后,在溶液中生成的Zn-水玻璃聚合物以及Si(OH)4可以选择性吸附在方解石表面,阻碍了NaOL在方解石表面的吸附,从而达到萤石和方解石的分离。 相似文献
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萤石和方解石表面都存在Ca2+的活性位点且两种矿物表面性质相近,导致萤石和方解石的分离难度较大。通过单矿物浮选试验、吸附量测定、Zeta电位测量以及浮选溶液化学计算,并引入Fe3+,将其与水玻璃混合,研究该组合抑制剂对萤石和方解石浮选分离的影响及其机理。浮选试验结果表明,与水玻璃相比,Fe-水玻璃选择性抑制了方解石的浮选,实现了两种矿物的分离。机理测试结果表明,Fe3+与水玻璃在溶液中反应的产物Fe-水玻璃聚合物以及水玻璃的水解组分Si(OH)4在方解石表面发生较强的吸附作用,阻碍了油酸钠的进一步吸附,从而抑制了方解石的浮选。 相似文献
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为探究矿浆电位对铜钼矿浮选的影响,采用黄铜矿、辉钼矿纯矿物作为样品,进行了矿浆pH、浮选药剂种类及用量对矿浆电位影响的研究。结果表明,黄铜矿上浮最佳矿浆电位为360 mV,pH为8。硫化钠、硫酸铵、碳酸钠三种调整剂按质量比1:1:1混合使用时,黄铜矿更易达到上浮电位区间。同时,当矿浆pH为9左右时,巯基乙酸能很好地抑制黄铜矿的上浮,并且对辉钼矿具有很好的选择性作用效果,有利于二者的分离。机理分析结果表明,在矿浆pH为8时,矿浆中生成大量的CuS是促进黄铜矿上浮的主要原因。 相似文献
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为了探明Ca~(2+)对粗细粒辉钼矿浮选行为和吸附特性的影响,通过纯矿物浮选试验,采用Zeta电位测试、Ca~(2+)溶液化学分析、XPS等手段探讨了Ca~(2+)在粗细粒辉钼矿表面吸附及对可浮性的影响。矿浆中Ca~(2+)会明显恶化辉钼矿的浮选效果,且对细粒级影响更加明显;在浓度为0.01mol/L Ca~(2+)溶液体系中,pH<12.39时,主要以钙离子和羟基钙离子形式存在,排除了Ca(OH)2沉淀罩盖纯矿物表面造成辉钼矿回收率下降的影响因素;经Ca~(2+)作用过的辉钼矿表面电位绝对值显著变小,证明Ca~(2+)在辉钼矿表面发生了较强的吸附。此外,XPS谱图分峰处理结果表明,细粒级辉钼矿表面CaMoO4相对含量较粗粒高出1.15倍。钙离子对细粒辉钼矿可浮性恶化更加明显,是由于Ca~(2+)在辉钼矿"棱"面发生了化学吸附反应,在其表面形成CaMoO4亲水薄膜,降低了矿物可浮性。 相似文献
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氧化预处理对铜钼浮选分离效果的影响 总被引:1,自引:0,他引:1
以NaClO或H2O2为氧化剂,研究了氧化对铜钼浮选分离试验效果的影响。探究了氧化剂用量、氧化时间和矿浆pH值等因素对黄铜矿和辉钼矿可浮性的影响以及作用机理。单矿物浮选实验结果表明,NaClO或H2O2氧化处理均可选择性抑制黄铜矿,且几乎不影响辉钼矿的可浮性。混合矿浮选实验结果表明,NaClO或H2O2氧化预处理-浮选都能实现铜钼有效分离,且分离效果均优于传统的黄铜矿抑制剂硫化钠。接触角测量结果表明,NaClO或H2O2氧化处理都可选择性地使黄铜矿表面亲水。Zeta电位和XPS分析结果表明,黄铜矿表面变得亲水是因为氧化处理后矿物表面生成了不溶于水的亲水性氧化物和氢氧化物。 相似文献
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《Minerals Engineering》2007,20(6):609-616
The effect of six lignosulfonates on the Hallimond tube flotation of chalcopyrite and molybdenite was studied as a function of pH, with the use of common pH modifiers (soda ash, potassium hydroxide, and lime). By comparing the flotation results with the adsorption data collected in Part I of this contribution, it becomes evident that the depression of chalcopyrite flotation takes places only when lignosulfonates adsorb on the mineral surface and, at the same time, a fraction of the xanthate collector is desorbed from the mineral surface. These two conditions are met only at high pH adjusted with lime. The depression of the natural floatability of molybdenite is relatively easy using all six lignosulfonates, but once the mineral is rendered strongly hydrophobic by the addition of an oily collector (dodecane), the depression of molybdenite by lignosulfonates is very difficult and only calcium lignosulfonates, and the highest molecular weight sodium salt, produce significant levels of depression. Overall, the results suggest that it is possible to selectively float chalcopyrite from molybdenite using lignosulfonates by depressing molybdenite. This can be achieved over a wide pH range provided that a pH modifier other than lime is used for pH control. Although the results showed that chalcopyrite flotation and molybdenite depression can be achieved under similar physicochemical conditions, further tests with real ores under industrial conditions have to be carried out with particular attention to the effect of process water quality. 相似文献
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For pretreatment of selective flotation, plasma treatment of chalcopyrite and molybdenite was applied then the minerals were washed by solution at pH 9 with oxygen bubbling. Surface characteristics of these minerals were investigated with AFM, XPS, zeta potential and contact angle measurements. Contact angle of chalcopyrite and molybdenite decreased a lot by plasma treatment. When they were washed with pH 9 solution with oxygen bubbling, contact angle of molybdenite increased whereas chalcopyrite one kept low. Adhesion force measurements indicated similar behavior. Result of flotation experiments indicated low recovery of both chalcopyrite and molybdenite after plasma treatment and only molybdenite recovery became higher after washing. Selective flotation of chalcopyrite and molybdenite could be achieved with this process. However, flotation of mixture of chalcopyrite and molybdenite after these treatments indicated both chalcopyrite and molybdenite were depressed. Addition of emulsified kerosene changed the flotation results where molybdenite was floated and chalcopyrite was depressed. Possible mechanism of selective flotation was proposed from the results of XPS, AFM, etc. 相似文献
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CMSD是以硫化钠和硫氢化钠为主要原料制备的一种新型铜钼分离浮选抑制剂。以黄铜矿和辉钼矿单矿物为对象,采用红外光谱分析和量子力学计算方法研究了CMSD的抑制作用机制。结果表明:CMSD在黄铜矿(112)面和(101)面发生化学吸附,在辉钼矿(001)面不发生化学吸附;CMSD在黄铜矿(112)面和(101)面上的吸附是通过CMSD中的HS-同时与这2个晶面上的Cu、Fe原子作用完成的;CMSD对黄铜矿的抑制是利用HS-吸附在黄铜矿的表面,降低黄铜矿的表面能,影响混合烃油在黄铜矿表面的吸附,从而降低黄铜矿的浮游性而实现的。 相似文献
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With increasing molybdenum ore mining, the difficult to treat ores, i.e., lower-grade and fine-disseminated ores have gradually increased in importance. Kerosene was widely used as the conventional collector of molybdenum flotation all along, but it does not adapt well to the flotation of molybdenite in difficult to treat ores. Meanwhile, kerosene has been cancelled from the manufacture catalogue in China, which makes large refineries no longer produce it, and in turn makes it difficult for a molybdenum flotation plant to purchase kerosene and makes it even harder for kerosene to keep a stable composition. Therefore, many molybdenum flotation plants began to apply diesel oil instead of kerosene as collector for molybdenite. However, the flotation results reveal that diesel oil from different manufacturers or being of different specifications from the same manufacturers has a different effect on the flotation of molybdenite, and pulp temperature has an obvious effect on the flotation efficiency of diesel oil. In pulp temperatures ranging from 10 to 30 °C, the flotation recovery of molybdenite increases with increasing high-boiling component in diesel oil. When pulp temperature is below 10 °C, the flotation recovery of molybdenite is related to the dispersibility of diesel oil, i.e., the proportion of high-boiling and low-boiling component in diesel oil. Therefore, a molybdenum flotation plant should not blindly apply diesel oil instead of kerosene as the collector for molybdenite, but should select diesel oil that is suitable for the properties of its ore. This technical note is helpful to better select the proper collector for a molybdenum flotation plant. 相似文献