原生钛铁矿选矿技术的进展

本文主要根据攀枝花钒钛磁铁矿中钛铁矿的选矿实际，并结合当前国内外钛铁矿选矿的发展现状，阐述了各种新型选矿设备和工艺在原生钛铁矿选矿中的应用，特别是对原生微细粒级钛铁矿浮选进行了较详细的探讨。     

陕西某难选原生钛铁矿选矿工艺研究

陕西某地原生钛铁矿为钒钛磁铁矿选铁尾矿,原矿品位较低,矿物组成复杂,钛铁矿与榍石、钛赤铁矿等脉石矿物可浮性相近,且钛铁矿嵌布粒度细,与榍石、钛磁铁矿等脉石连生密切,分离难度大。针对该矿石性质,进行了4种方案的工艺对比试验研究,结果表明,一段高梯度强磁选-磨矿-弱磁选-二段高梯度强磁选-脱硫浮选-钛浮选方案,工艺简单,精矿指标最好,在原矿Ti O2品位9.78%的情况下,获得了Ti O2品位46.82%,回收率40.84%的钛铁矿精矿,且浮选前再磨后,精矿指标可进一步提高到Ti O2品位47.23%,回收率45.36%。     

SSS-Ⅱ水平磁场高梯度磁选机及其在密地选钛厂的应用

垂直磁场高梯度磁选机普遍存在磁介质容易堵塞的现象,而且垂直磁系磁选机下磁极长期浸泡在矿浆中,易造成磁极的腐蚀,同时给矿对上磁极的冲刷也易造成磁极的磨损。为此,研制开发了SSS-Ⅱ型水平磁场高梯度磁选机,该磁选机采用特殊设计使磁系不接触矿浆,彻底解决了矿浆对磁系的腐蚀及磨损,采用多梯度直排介质和水气联合卸矿方式克服了介质堵塞的难题。通过在攀钢密地选钛厂微细粒矿磁选车间的使用表明在同等条件下该新型设备的精矿品位和回收率明显高于生产现场垂直磁场高梯度磁选机,且其长期运行的选别效果稳定。     

攀枝花钒钛磁铁矿钛铁矿回收工艺流程优化探讨

根据攀枝花钒钛磁铁矿的特点,分析了现选钛流程存在的问题,并通过试验研究,对钛铁矿回收工艺流程进行了优化,取得了较好的选别指标。     

基于单元介质分析法的磁介质单丝捕获试验

本研究应用一种“单元介质分析法”,以钛铁矿为试样,对不同直径圆柱形磁介质进行单丝捕获试验。研究结果表明：相同磁场强度条件下,磁性矿物捕获量随磁介质丝径变小而减少;相同丝径磁介质,在任一固定的磁场强度,磁介质丝对应一个饱和捕获值;随着磁场强度的增强,不同丝径磁介质对矿粒捕获具有一定的粒级选择特征。本试验方法可以有效用于磁介质单丝捕获的准确测定,对有关磁介质单丝捕获的相关理论或模拟分析的准确性,可以进行试验验证,对磁介质在生产实践中的优化设计具有一定指导意义。     

Oxidation kinetics of ilmenite concentrate by non-isothermal thermogravimetric analysis

The non-isothermal oxidation experiments of ilmenite concentrate were carried out at various heating rates under air atmosphere by thermogravimetry.The oxidation kinetic model function and kinetic parameters of apparent activation energy(Ea)were evaluated by Málek and Starink methods.The results show that under air atmosphere,the oxidation process of ilmenite concentrate is composed of three stages,and the chemical reaction(G(α)=1-(1-α)~2,whereαis the conversion degree)plays an important role in the whole oxidation process.At the first stage(α=0.05-0.30),the oxidation process is controlled gradually by secondary chemical reaction with increasing conversion degree.At the second stage(α=0.30-0.50),the oxidation process is completely controlled by the secondary chemical reaction(G(α)=1-(1-α)~2).At the third stage(α=0.50-0.95),the secondary chemical reaction weakens gradually with increasing conversion degree,and the oxidation process is controlled gradually by a variety of functions;the kinetic equations are G(α)=(1-α)~(-1)(β=10K·min~(-1),whereβis heating rate),G(α)=(1-α)~(-1/2)(β=15-20K·min~(-1)),and G(α)=(1-α)~(-2)(β=25K·min~(-1)),respectively.For the whole oxidation process,the activation energies follow a parabolic law with increasing conversion degree,and the average activation energy is 160.56kJ·mol~(-1).     

钛磁铁矿对钛铁矿浮选的影响

钛磁铁矿对钛铁矿的浮选会产生非常不利的影响。单矿物研究结果表明:钛磁铁矿具有比钛铁矿更好的可浮性,浮选中会优先进入精矿,影响精矿品位,并增加药剂消耗;钛磁铁矿易产生磁团聚现象,造成机械夹带,包裹脉石的钛磁铁矿磁团聚体进入浮选精矿中会降低精矿品位和回收率。钒钛磁铁矿选铁尾矿实际矿样的试验结果表明:不除铁直接浮选钛时,精矿TiO2品位为44.02%,回收率为44.38%;而先经弱磁选除去钛磁铁矿后,采用相同的浮选流程和药剂制度,浮选精矿的TiO2品位提高到47.40%,回收率提高到52.64%。     

攀枝花细粒级钛铁矿选矿试验研究

本文简述了采用F968为捕收剂、SSB和草酸为调整剂,用强磁一浮选工艺流程,在弱酸性（接近中性）矿浆介质中,对攀枝花钒钛磁铁矿选铁尾矿细粒级钛铁矿进行的试验研究以及所获得的高品位高回收率的选钛技术指标．     

攀枝花细粒级钛铁矿选钛扩大试验

本文简述了采用Ｆ９６８为捕收剂、ＳＳＢ和草酸为调整剂,用强磁—浮选工艺流程,在弱酸性（近于中性）矿浆介质中,对攀枝花钒钛磁铁矿选铁尾矿细粒级钛铁矿进行的扩大连续试验研究以及所获得的高品位高回收率的选钛技术指标     

Chemical and mineralogical composition of ilmenite: Effects on physical and surface properties

Some physical and chemical properties of three ilmenite samples: IL-F (purchased from the mineral dealership of A and F Krantz), IL-Q (Qara-aghaj deposit, Iran) and IL-K (Kahnuj deposit, Iran) were studied. The substitution of different amounts of Mg, Mn and V in the crystal structure of ilmenite was identified by microprobe analysis. Different amounts of hemoilmenite exsolution were observed inside all three ilmenite samples using SEM, electron microprobe and X-ray diffraction analysis. Using these analytical techniques, titanite phase was found inside the IL-K ilmenite. The XPS analysis indicated that the contents of Fe³⁺ are 5.66, 5.33 and 3.72% for IL-F, IL-Q and IL-K, respectively which are in good agreement with the amounts of hemoilmenite exsolution. Mg and V contents in the ilmenite crystal structure have a good negative correlation with lattice constants (LC), unit cell volume, crystallinity index, specific gravity and IEP, while the Mn content correlates positively with these parameters. The IEP determined as 4.2, 5.4 and 6.25 for IL-F, IL-Q and IL-K, respectively, has a negative correlation with Fe³⁺ ions and ilmenite floatability. In comparison with magnetic susceptibility, the electrical resistivity of ilmenite has a higher correlation with surface properties (IEP and floatability), lattice constants, and unit cell volume.