The flotation behavior of Xixia andalusite was studied with different collectors.The tests were conducted with a pure andalusite sample in micro-flotation cell and then with an ore sample in a mechanical flotation cel...The flotation behavior of Xixia andalusite was studied with different collectors.The tests were conducted with a pure andalusite sample in micro-flotation cell and then with an ore sample in a mechanical flotation cell.The surface charge was measured on pure andalusite sample and the isoelectric point（IEP） was found to be pH 5.2.Andalusite is floated with an amine collector above IEP where mineral surface is negatively charged.In contrast,an alkyl sulfonate collector（sodium dodecyl benzene sulfonate） is effective in the pH range where andalusite surface is positively charged.Furthermore,andalusite is floated with oleate in neutral and mildly alkaline pH values.55.3% Al2O3 is produced with 75.6% andalusite recovery when using the alkyl benzene sulfonate collector.Starch is found to be an effective depressant for gangue minerals in alkyl benzene sulfonate flotation.Moreover,slimes are found to have an adverse effect on the flotation of andalusite.Therefore,pretreatment by desliming and pre-float（to remove carbonaceous species） prior to andalusite flotation is necessary.展开更多
为了研究矿物与细菌相互作用后矿物的Zeta电位与细菌对矿物的氧化能力之间的关系,利用Zeta电位仪检测与细菌作用前后硫化矿的Zeta电位,根据Zeta电位和IEP(Iso Electric Point)的变化,判断细菌对硫化矿的氧化作用及其程度。结果表明,硫...为了研究矿物与细菌相互作用后矿物的Zeta电位与细菌对矿物的氧化能力之间的关系,利用Zeta电位仪检测与细菌作用前后硫化矿的Zeta电位,根据Zeta电位和IEP(Iso Electric Point)的变化,判断细菌对硫化矿的氧化作用及其程度。结果表明,硫化铜矿与细菌作用后,矿物的Zeta电位降低,辉铜矿、斑铜矿和铜蓝的IEP向铜的氢氧化物方向移动,而黄铜矿向细菌的IEP方向靠近,分析原因主要是由于各矿物被细菌氧化的程度不同。对与细菌相互作用后的铜蓝进行XPS测试结果证实其表面被氧化。研究证实了细菌对硫化矿的直接氧化作用,同时也得出不同硫化铜的细菌氧化顺序:辉铜矿>斑铜矿>铜蓝>黄铜矿。展开更多
文摘The flotation behavior of Xixia andalusite was studied with different collectors.The tests were conducted with a pure andalusite sample in micro-flotation cell and then with an ore sample in a mechanical flotation cell.The surface charge was measured on pure andalusite sample and the isoelectric point（IEP） was found to be pH 5.2.Andalusite is floated with an amine collector above IEP where mineral surface is negatively charged.In contrast,an alkyl sulfonate collector（sodium dodecyl benzene sulfonate） is effective in the pH range where andalusite surface is positively charged.Furthermore,andalusite is floated with oleate in neutral and mildly alkaline pH values.55.3% Al2O3 is produced with 75.6% andalusite recovery when using the alkyl benzene sulfonate collector.Starch is found to be an effective depressant for gangue minerals in alkyl benzene sulfonate flotation.Moreover,slimes are found to have an adverse effect on the flotation of andalusite.Therefore,pretreatment by desliming and pre-float（to remove carbonaceous species） prior to andalusite flotation is necessary.
文摘为了研究矿物与细菌相互作用后矿物的Zeta电位与细菌对矿物的氧化能力之间的关系,利用Zeta电位仪检测与细菌作用前后硫化矿的Zeta电位,根据Zeta电位和IEP(Iso Electric Point)的变化,判断细菌对硫化矿的氧化作用及其程度。结果表明,硫化铜矿与细菌作用后,矿物的Zeta电位降低,辉铜矿、斑铜矿和铜蓝的IEP向铜的氢氧化物方向移动,而黄铜矿向细菌的IEP方向靠近,分析原因主要是由于各矿物被细菌氧化的程度不同。对与细菌相互作用后的铜蓝进行XPS测试结果证实其表面被氧化。研究证实了细菌对硫化矿的直接氧化作用,同时也得出不同硫化铜的细菌氧化顺序:辉铜矿>斑铜矿>铜蓝>黄铜矿。
