冶炼高钛型钒钛磁铁矿高炉喷煤试验成功的原因浅析

冶炼高钛型钒钛磁铁矿的高炉喷煤的主要问题,是钛渣变稠。高炉喷煤后,入炉煤粉是否燃烧完全,是否抑制了钛的过还原,既是钛渣变稠与否的主要原因,也是冶炼高钛型钒钛磁铁矿高炉喷煤试验成败与否的关键所在。     

滴定法测定钒钛磁铁矿中钛含量

经过磷酸溶样和过氧化钠熔样的数据比对以及对影响钛测定的因素的讨论和选择,采用热浓磷酸分解和滴定法测定钒钛磁铁矿中钛含量,该方法操作简便,检测时间短,用于实际样品的测定获得满意结果。对钒钛磁铁矿国家一级标准物质GBW 07225、GBW 07226a进行分析验证,测试结果与标准值相符,相对标准偏差(RSD,n=8)均小于1.5%,符合地质样品分析的质量管理规范要求。     

从钒钛磁铁矿还原—熔化分离渣中提取钒和钛

攀枝花钒钛磁铁矿经竖炉直接还原后,电炉熔化分离所得到的熔渣中,富集了原矿所含钒、钛的绝大部份,钒有93％以上,钛有90％。因此,如何有效地从渣中回收钒、钛,就成为综合利用攀枝花资源、打通钒钛磁铁矿竖炉直接还原流程的一个关键问题。     

攀枝花钛精矿浮选新工艺研究

针对攀钢选钛厂现有流程复杂、钛铁矿回收率低等问题,提出了"弱磁除铁—浮选脱硫—钛浮选"的全粒级选别新工艺流程。该工艺流程简单,试验指标理想。小型试验获得了钛精矿(TiO2)品位47.4%,钛回收率45.8%的选矿指标。试验中发现:原矿中的钛磁铁矿、入选细度和矿浆的pH值等因素对浮选指标有较大的影响。     

云南普玛低品位钛铁矿选矿工艺试验研究

云南普玛低品位钛铁矿含Fe 20.84%,TiO_25.26%,其中磁铁矿约占总铁的23.42%,钛铁矿约占总钛的32.32%.针对矿石中Fe及TiO_2品位低、嵌布粒度细、矿物成分复杂等特点,采用"一段磨矿-弱磁选铁-强磁抛尾-强磁精矿再磨-弱磁再选铁-摇床精选"的联合工艺流程,可获得铁精矿含Fe品位62.61%,Fe回收率27.35%,钛精矿含TiO_2品位44.90%,TiO_2回收率38.90%的分选指标,有效回收了矿石中的磁铁矿和钛铁矿.     

攀枝花钒钛磁铁矿的综合利用与深度加工

针对攀枝花钒钛磁铁矿的特殊性，探讨了攀钢冶炼过程中ＴｉＯ２的流向和分布情况，论述了钛系列精细化工产品深度开发的重要性，对攀枝花钛化工的发展方向提出了具体建议．认为，研制高纯ＴｉＯ２微粉和超微粉、钛酸酯偶联剂、ＴｉＣｌ２催化剂、钛系列彩色颜料、无机钛酸盐等多品种，作为大宗化工产品钛白颜料及钛冶金产品的补充，对进一步提高攀枝花钒钛磁铁矿的综合利用，具有十分重要意义．     

微细粒钛铁矿和钛辉石的剪切絮凝浮选行为

通过矿物可浮性试验、粒径测试、光学显微镜测试、浊度沉降法和颗粒间相互作用的计算,对微细粒钛铁矿和钛辉石的剪切絮凝浮选行为进行分析.结果表明,适宜的搅拌强度和搅拌时间可提高微细粒钛铁矿和钛辉石的可浮性,搅拌强度对剪切絮凝的影响随颗粒疏水性的增强而变小,絮体粒径随搅拌强度的增加而明显增大.钛辉石形成的絮体主要为开放型的枝链状结构,而钛铁矿絮体枝链闭合,较为密实;矿物的剪切絮凝行为与矿物可浮性的变化是一致的,这两种矿物颗粒在捕收剂溶液中均能发生絮凝行为.     

昆明地区钛资源分布及评价

我国是钛资源大国，储量占世界储量的60％以上，但钒钛磁铁共生矿占了主导地位。昆明地区钛资源主要分布在富民县、禄劝县、安宁县、西山区，是以砂矿为主的钛铁矿，矿物组合筒单，分选性能良好，钛精矿钙镁杂质低是生产海绵钛的优质原料。     

还原—磨选工艺在有色冶金中的应用研究现状及展望

还原—磨选工艺技术是一种有色金属的高效共性富集技术。系统地介绍了还原—磨选工艺技术在贵金属的回收富集、红土镍矿中回收镍钴铁、钒钛磁铁矿中回收钒钛铁、钛精矿中富集钛和尾矿及冶金渣中回收稀土元素等方面的应用,分析了还原—磨选工艺技术在应用中存在问题及未来的发展方向。     

钢铁、钛和铝工业废渣在去除水中重金属和酸性中的作用

选取钢铁工业废渣中的钒钛磁铁矿选铁尾矿渣、钒钛磁铁矿含钛高炉渣、普通高炉渣、钢渣,钛工业废渣中的钒钛磁铁矿选钛尾矿渣和铝工业废渣中的赤泥作为研究对象,通过圆柱试验以检验其对水中重金属Cd2＋、Co2＋、Cu2＋、Mn2＋、Ni2＋、Zn2＋和酸性的去除能力。这6种工业废渣对水中的Cd2＋的吸附容量为278~6 811 mg/kg,对Co2＋的吸附容量为127~6 052 mg/kg,对Cu2＋的吸附容量为442~53 566 mg/kg,对Mn2＋的吸附容量为95~5 594 mg/kg,对Ni2＋的吸附容量为158~6 213 mg/kg,对Zn2＋的吸附容量为151~6 710 mg/kg,对酸的中和容量为4.5~8.9 mol H＋/kg。工业废渣尤其是钢渣和赤泥在改善地下水酸性和去除矿业或工业废水中的重金属离子和酸性方面具有很好的应用前景,可以达到以废治废的目的。     

Beneficiation studies on recovery and in-depth characterization of ilmenite from red sediments of badlands topography of Ganjam District,Odisha, India

This paper deals with the recovery of ilmenite mineral from red sediments of badlands topography and suggested flowsheet with material balance. The results of these investigations reveal that the red sediment samples contain 33.2% total heavy mineral, in which ilmenite mineral concentrate is 28.71% (by weight). The ilmenite concentrate recovered from red sediment sample by physical beneficiation process, which included scrubbing, desliming, gravity concentration, magnetic and electrostatic separation, contains 99.41% grade with 97.3% recovery. The ilmenite mineral concentrate recovered from red sediments is also suitable for industrial applications. The characterization studies on ilmenite reveal that the TiO₂ percentage is marginally increasing from 46.69% to 47.86% with increasing magnetic intensity from 0.46 to 1.55 T.     

辽宁凤城含铀硼铁复合矿分选研究

针对辽宁凤城硼铁复合矿资源,在综合测定矿石成分及其目的矿物嵌布特性的基础上开展矿物分选试验研究,采用弱磁场磁选机回收磁铁矿,应用水力旋流器、螺旋溜槽以及摇床等重选设备回收晶质铀矿物,以氧化石蜡皂作为捕收剂、Na2CO3作为矿浆pH值调整剂浮选分离硼矿物．结果表明,当磨矿细度小于0．047mm占99．26％时,铁精矿中TFe品位达到60．27％,回收率为79．21％;重选回收铀矿物效果较好,但是浮选分离指标有待大幅度提高．进一步提高目的矿物单体解离度是改善分选指标的关键．     

Innovative pre-concentration technology for recovering ultrafine ilmenite using superconducting high gradient magnetic separator

To achieve the utilization of the abandoned ultrafine ilmenite (−20 μm) produced in the titanium magnetite processing plant in Panzhihua, the superconducting high-gradient magnetic separation (SMS) technology was proposed in this study. After optimizing the conditions of magnetic intensity, feeding and pulsation, an SMS concentrate with TiO₂ grade of 16.03% and TiO₂ recovery of 66.39% was obtained through one roughing–one cleaning pre-concentration flowsheet. The specific magnetic force and magnetic force were calculated and analysed to illustrate the pre-concentration mechanism, and the results revealed that the combination of high magnetic field and strong pulsating resulted in the effective pre-concentration of the ultrafine ilmenite in the SMS process. In addition, the magnetic force analysis indicated that the high magnetic intensity and high magnetic gradient are the key factors of the SMS technology. Furthermore, the EDS-Mapping detection certified that the ultrafine ilmenite was concentrated from the gangue minerals using SMS technology.     

含硫低品位锡尾矿的综合利用

某低品位锡尾矿中锡和硫的品位分别为０．２７％和５．０７％,具有综合回收价值,锡和硫在－０．０２５ ｍｍ粒级的分布率分别为６１．６４％和７６．７４％,综合回收难度较大. 试验结果表明,摇床和磁选均没有显著地选别效果,浮选则可以较好地达到选别的目的;选别工艺上,可先使用浮选预先脱硫,脱硫后进一步选别锡;相对于摇床,浮选能更有效地回收锡;硫化矿的存在会显著影响锡的选别,较为彻底的脱硫可改善锡的浮选指标;使用三段浮选脱硫工艺,硫的脱除率可达９０％以上;脱硫的过程中会损失部分的锡,可通过对硫粗精矿再磨后,完成锡和硫的进一步分离;通过浮选闭路流程,最终可获得硫品位和回收率分别为４２．７１％和８９．８４％的硫精矿,以及锡品位和回收率分别为３．１６％和６０．３７％的锡精矿.     

贫磁铁矿反浮选降硅试验

湖北省某地具有较为丰富铁矿资源,矿石中铁含量较低,原矿中全铁（TFe）含量约15%,属于贫磁铁矿,铁矿物的嵌布粒度较细,通过单一弱磁选很难得到全铁品位超过60%的铁精矿,针对该矿弱磁选精矿进行反浮选提铁脱硅研究,一粗一精开路反浮选流程精矿品位可达60%以上,铁回收率60%,产率50%左右.通过小型闭路试验,反浮选最终获得较好指标：精矿产率为68.57%,品位为58.62%,回收率为82.83%.     

贫磁铁矿反浮选降硅试验

湖北省某地具有较为丰富铁矿资源,矿石中铁含量较低,原矿中全铁(TFe)含量约15%,属于贫磁铁矿,铁矿物的嵌布粒度较细,通过单一弱磁选很难得到全铁品位超过60%的铁精矿,针对该矿弱磁选精矿进行反浮选提铁脱硅研究,一粗一精开路反浮选流程精矿品位可达60%以上,铁回收率60%,产率50%左右.通过小型闭路试验,反浮选最终获得较好指标:精矿产率为68.57%,品位为58.62%,回收率为82.83%.     

某铜铁矿选矿工艺研究

主要针对某铜铁矿矿石性质,研究其选矿工艺流程,最终确定选铜回路采用浮选工艺流程,浮选药剂为石灰和丁基黄药;选铁回路采用磁选工艺流程方案。最终铜精矿品位为20.53%、回收率94.50%,铁精矿品位58.54%、回收率72.30%,获得了较好的试验指标。     

磨矿细度对钛铁矿浮选指标的影响

不同的磨矿细度对钛精矿的浮选指标影响很大,适宜的磨矿细度既能保证有用矿物较完全的单体解离,又不至于造成过粉碎而恶化浮选效果。试验研究证明,对该矿石兼顾精矿品位和回收率两方面的指标,以-0.074 mm为标准进行衡量,其占有率为85%的磨矿细度为最佳入选细度。     

Statistical analysis and concentration of iron ore using Longi LGS 500 WHIMS

A Longi LGS 500 wet high intensity magnetic separator(WHIMS) was used to concentrate a fine, low grade South African hematite ore. The ore was prepared into different size fractions and was subjected to changes in pulp density, magnetic field intensity and pulsation frequency which followed a 33 full factorial matrix. The concentrate mass yield and Fe grade were selected as the dependent responses to the changes. The analysis of variance(ANOVA) shows that the variables investigated are significant to the material's response to magnetic separation. This significance was in the order of magnetic field intensity followed by pulsation frequency and then pulp density. It was also noted that a single stage magnetic separation has a potential to upgrade a feed( 75 lm and 40% Fe) to a 55% Fe grade, as the pulsation frequency increases. In addition, the model predictions and actual data were in good agreement, reporting regression coefficients within acceptable ranges.