The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.T...The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min)while it decreases for Ol-Px,Tr-Cch and quartz from 6.332,7.309 and 7.774 mol/(g·min)to 5.034,6.223 and 7.371 mol/(g·min),respectively.Also,the flotation experiments on a binary mixture of minerals indicate that after surface dissolution the values of modified rate constant for ilmenite flotation from Ol-Px,Tr-Cch and quartz are enhanced from 36.15,36.52 and 47.86 min-1 to 41.72,45.78 and 56.24 min-1,respectively.This results in the improvement of kinetic selectivity index(SI)in the separation of treated ilmenite from gangue minerals.As evidenced by ICP-MS analysis,the decrease of kinetic parameters for gangue minerals can be due to the removal of Fe^2+,Ca^2+and Mg^2+ions from their surfaces,which results in the lack of enough active sites to interact with collector species.As confirmed by contact angle measurements,this prevents the formation of a stable hydrophobic layer on the minerals surfaces for creating stable attachments between minerals and bubbles.Generally,the improvement of ilmenite flotation kinetics has a negative correlation with the iron content in its accompanied gangue minerals.展开更多
The flotation performances of styrene phosphonic acid（SPA） to synthetic（Ce,La）2O3（REO）, calcium fluorite（CaF2） and fluorapatite（Ca5F（PO4）3） were investigated by flotation tests, flotation of synthetic mixe...The flotation performances of styrene phosphonic acid（SPA） to synthetic（Ce,La）2O3（REO）, calcium fluorite（CaF2） and fluorapatite（Ca5F（PO4）3） were investigated by flotation tests, flotation of synthetic mixed mineral, the surface adsorption capacity and the polarizing microscopy to solve the flotation separation problem of rare earth oxides from roasted concentrate. The flotation test results indicated that compared with CaF2 and Ca5F（PO4）3, SPA exhibited superior collecting performance to direct flotation recovery of REO and floated out above 90% REO at pH 3–6. However, the collecting ability of SPA to CaF2 and Ca5F（PO4）3 was extremely weak and the highest recovery was only 20% at pH 2–11. The flotation of synthetic mixed mineral showed that SPA was a good collector reagent for flotation of synthetic REO at pH 5, so REO, CaF2 and Ca5F（PO4）3 could be separated from roasted concentrate by using SPA as a collector. The surface adsorption capacity tests and polarizing microscopy results confirmed that SPA was adsorbed on REO surface, while CaF2 and Ca5F（PO4）3 were not. The adsorption mechanism of SPA to synthetic REO was studied by solution chemistry analysis of collector, the ζ-potential tests, infrared spectroscopy and X-ray photoelectron spectroscopy（XPS） analyses. The results indicated that SPA was physically adsorbed onto REO surface, which exhibited excellent flotation selectivity to REO against CaF2 and Ca5F（PO4）3.展开更多
采用分子模拟方法研究氯化钠-光卤石反浮选体系中捕收剂十二烷基吗啉(DMP)选择性吸附氯化钠的机理.用Material Studio 4.0软件和COMPASS分子力场方法建立了DMP在氯化钠和光卤石两种矿物表面的吸附模型,并进行动力学模拟和能量优化,确立...采用分子模拟方法研究氯化钠-光卤石反浮选体系中捕收剂十二烷基吗啉(DMP)选择性吸附氯化钠的机理.用Material Studio 4.0软件和COMPASS分子力场方法建立了DMP在氯化钠和光卤石两种矿物表面的吸附模型,并进行动力学模拟和能量优化,确立了DMP在两种矿物表面的最佳吸附构型.结果表明,DMP分子通过其官能团中的O、N原子与氯化钠界面水结构中的H原子之间的氢键作用吸附在氯化钠表面,吸附作用能为-119.49kJ·mol-1,而光卤石界面水结构不能保持稳定排列,致使DMP直接作用在光卤石表面,吸附能为-37.97kJ·mol-1,在两种矿物共存体系中,这种吸附能差异导致了DMP在氯化钠表面的选择性吸附.展开更多
对云南某高硫铅锌矿进行选矿实验研究。原矿铅品位2.98%、锌品位2.79%、银品位114.95 g/t,在磨矿细度为-0.074 mm 76.19%条件下,采用优先浮选工艺流程,以硫酸锌+碳酸钠作为组合抑制剂,以新型捕收剂HQ-Pb作为铅捕收剂,最终获得铅品位56....对云南某高硫铅锌矿进行选矿实验研究。原矿铅品位2.98%、锌品位2.79%、银品位114.95 g/t,在磨矿细度为-0.074 mm 76.19%条件下,采用优先浮选工艺流程,以硫酸锌+碳酸钠作为组合抑制剂,以新型捕收剂HQ-Pb作为铅捕收剂,最终获得铅品位56.62%、银品位1915.38 g/t的铅精矿,铅回收率82.36%,银回收率73.44%;获得锌品位45.92%、银品位171.38 g/t的锌精矿,锌回收率82.29%,银回收率7.58%。展开更多
文摘The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min)while it decreases for Ol-Px,Tr-Cch and quartz from 6.332,7.309 and 7.774 mol/(g·min)to 5.034,6.223 and 7.371 mol/(g·min),respectively.Also,the flotation experiments on a binary mixture of minerals indicate that after surface dissolution the values of modified rate constant for ilmenite flotation from Ol-Px,Tr-Cch and quartz are enhanced from 36.15,36.52 and 47.86 min-1 to 41.72,45.78 and 56.24 min-1,respectively.This results in the improvement of kinetic selectivity index(SI)in the separation of treated ilmenite from gangue minerals.As evidenced by ICP-MS analysis,the decrease of kinetic parameters for gangue minerals can be due to the removal of Fe^2+,Ca^2+and Mg^2+ions from their surfaces,which results in the lack of enough active sites to interact with collector species.As confirmed by contact angle measurements,this prevents the formation of a stable hydrophobic layer on the minerals surfaces for creating stable attachments between minerals and bubbles.Generally,the improvement of ilmenite flotation kinetics has a negative correlation with the iron content in its accompanied gangue minerals.
基金Project supported by National Basic Research Program of China(973 Program)(2012CBA01205)
文摘The flotation performances of styrene phosphonic acid（SPA） to synthetic（Ce,La）2O3（REO）, calcium fluorite（CaF2） and fluorapatite（Ca5F（PO4）3） were investigated by flotation tests, flotation of synthetic mixed mineral, the surface adsorption capacity and the polarizing microscopy to solve the flotation separation problem of rare earth oxides from roasted concentrate. The flotation test results indicated that compared with CaF2 and Ca5F（PO4）3, SPA exhibited superior collecting performance to direct flotation recovery of REO and floated out above 90% REO at pH 3–6. However, the collecting ability of SPA to CaF2 and Ca5F（PO4）3 was extremely weak and the highest recovery was only 20% at pH 2–11. The flotation of synthetic mixed mineral showed that SPA was a good collector reagent for flotation of synthetic REO at pH 5, so REO, CaF2 and Ca5F（PO4）3 could be separated from roasted concentrate by using SPA as a collector. The surface adsorption capacity tests and polarizing microscopy results confirmed that SPA was adsorbed on REO surface, while CaF2 and Ca5F（PO4）3 were not. The adsorption mechanism of SPA to synthetic REO was studied by solution chemistry analysis of collector, the ζ-potential tests, infrared spectroscopy and X-ray photoelectron spectroscopy（XPS） analyses. The results indicated that SPA was physically adsorbed onto REO surface, which exhibited excellent flotation selectivity to REO against CaF2 and Ca5F（PO4）3.
文摘采用分子模拟方法研究氯化钠-光卤石反浮选体系中捕收剂十二烷基吗啉(DMP)选择性吸附氯化钠的机理.用Material Studio 4.0软件和COMPASS分子力场方法建立了DMP在氯化钠和光卤石两种矿物表面的吸附模型,并进行动力学模拟和能量优化,确立了DMP在两种矿物表面的最佳吸附构型.结果表明,DMP分子通过其官能团中的O、N原子与氯化钠界面水结构中的H原子之间的氢键作用吸附在氯化钠表面,吸附作用能为-119.49kJ·mol-1,而光卤石界面水结构不能保持稳定排列,致使DMP直接作用在光卤石表面,吸附能为-37.97kJ·mol-1,在两种矿物共存体系中,这种吸附能差异导致了DMP在氯化钠表面的选择性吸附.
