采用磁选工艺改善梅山铁矿铁精矿的质量

梅山铁矿所产铁精矿因含磷、硫杂质高, 无法满足冶炼的要求。采用磁选工艺处理脱硫铁精矿能有效降低铁精矿的磷、硫含量以及铁精矿的粘性。工业试验结果表明, 对于含铁52.77 %, 磷0.399 %, 硫0.440%的脱硫铁精矿, 经过弱磁- 强磁流程选别, 可获得含铁56.08 %, 磷0.246 %, 硫0.29%的自熔性铁精矿, 铁回收率为94.51 %。     

磁、重(浮)联合流程回收选厂尾矿中铁的试验研究

针对某铁矿选厂尾矿中镜铁矿粗细嵌布不均的特点, 采用重选-磁选-浮选和重选-磁选-重选工艺流程分别进行选别, 分别获得了铁精矿产率22.26%、铁品位65.86%、铁回收率71.76%与铁精矿产率20.44%、铁品位66.13%、铁回收率66.16%的良好试验指标。研究成果不仅为该尾矿资源的开发利用提供了技术支撑, 而且对同类二次资源的高效开发具有重要的指导和借鉴意义。     

攀西某铁矿选矿试验研究

采用3种流程方案(一段磨矿一段选别工艺流程、阶段磨矿阶段选别工艺流程和粗粒抛尾-一段磨矿一段选别工艺流程)对某全铁品位14.34%的铁矿进行选别。试验结果表明, 采用粗粒抛尾-一段磨矿一段选别-浮选脱硫工艺, 可以获得含铁62.85%、钒1.21%、铁回收率48.45%、钒回收率72.32%的优质铁精矿。该流程具有工艺合理、流程简单、生产成本低等优点, 是处理该铁矿较为合理的选矿工艺流程。     

某难选高磷赤褐铁矿提铁降磷选矿试验研究

云南某铁矿石铁矿物主要以赤褐铁矿形式存在, 磷含量0.586%, 属于高磷难选铁矿石, 采用常规单一选矿方法难以获得令人满意的选别指标。试验采用还原焙烧-磁选-反浮选工艺流程处理该矿石, 获得了铁品位为61.72%、磷含量为0.20%的铁精矿, 铁回收率为67.48%, 为类似难选高磷赤褐铁矿的开发利用提供了新的思路。     

内蒙古某铁矿选矿试验

针对内蒙古某低硫高硅铁矿石成分比较复杂且难以回收的问题,在矿石性质研究的基础上,采用弱磁-强磁-反浮选工艺流程进行了磨矿选别条件试验研究。在最佳试验条件下,获得了铁品位为65.83%、铁回收率76.15%的铁精矿。     

梅山铁矿铁精矿降磷研究

探讨了采用反浮选原则流程降低梅山铁精矿中磷的含量,结果表明,采用新型捕收剂SO8和改性后的SO81、水玻璃作抑制剂、碳酸钠作pH调整剂,在常温(25℃)和低温(15℃)条件下,能够获得磷品位为0.15％～0.18％,铁品位为55.58％～55.98％。铁回收率为94.82％～97.43％的指标。     

大顶铁矿原生矿选矿工艺流程研究

考查了磁场强度、磨矿细度对铁分选指标的影响.采用预先分级抛7、粗磨选别,粗精矿再磨再选的工艺流程,提高了原矿的处理量,降低了磨矿成本,取得了铁精矿品位65.54%,铁回收率94.11%的技术指标.     

柏泉磷铁矿石可选性研究

为了给柏泉铁矿现场磷、铁回收工艺优化提供数据基础,对该含磷铁矿进行了系列可选性试验研究。结果表明:适宜的一段、二段磨矿细度-0.074mm含量分别为40%和85%,进行两段磨矿和三段弱磁选可获得TFe品位64.25%、回收率50.47%、P2O5含量仅为0.03%的铁精矿;选铁总尾矿在捕收剂用量600g/t、水玻璃用量400g/t的条件下,进行1粗3精2扫闭路浮选,可获得P2O5品位30.74%、回收率72.94%的磷精矿。本研究为选厂工艺参数优化提供了数据支持和技术指导。     

梅山铁精矿粗细分级选别降磷研究

采用粗细分级选别新工艺，并使用新型选磷捕收剂Ｔ－６８，能达到梅山铁精矿降磷的各项指标（尤其是铁精矿碱比）的要求。该方案具有流程简单、易行及技术经济指标好等优点。     

某难选低品位萤石矿选矿试验研究

采用"磁选回收铁-浮选回收萤石"工艺方案,以自制高效捕收剂ZY-12作萤石浮选捕收剂、碳酸钠作分散剂、水玻璃作抑制剂获得了良好的选别指标。在原矿含铁12.38%、含Ca F2 25.42%的情况下,实验室闭路流程试验获得了含TFe 58.62%、TFe回收率36.89%的铁精矿,含Ca F2 97.23%、Ca F2回收率81.39%的萤石精矿。矿石中铁及萤石矿物都得到了较好的综合回收,新技术具有良好的推广应用价值。     

东鞍山难选铁矿捕收剂的合成及工业应用

基于东鞍山入选铁矿石铁品位降低和组成变化,KS-Ⅰ捕收剂面临很大的挑战,难以满足炼铁工业的要求。设计和合成了一种KS-Ⅲ捕收剂,并应用于东鞍山烧结厂的浮选试验。与KS-Ⅰ浮选药剂相比,1号矿样铁精矿品位提高0.43个百分点、尾矿铁品位降低0.56个百分点以上、捕收剂的单位耗量减少6.89个百分点,铁的回收率提高0.31个百分点。     

Dissolution behaviour of a Turkish lateritic nickel ore

The atmospheric pressure sulphuric acid leaching characteristics of Adatepe (Eski?ehir, Turkey) laterite ore that has recently been put into operation was investigated. The effects of sulphuric acid concentration (5-95%), temperature (20-95 °C) and time (30-240 min) on leaching were determined by nickel, iron and arsenic analyses. The amounts of Ni, Fe and As in solution were observed to increase with increase of temperature from 20 °C to 70 °C for sulphuric acid concentrations between 5% and 95%. Further increase of temperature to 95 °C showed that the dissolution of Ni, Fe and As were increased until 60% sulphuric acid concentration and over 60% a decrease in the dissolution percentages was observed due to the probable formation of nickel and silicon containing ferric sulphate type compounds that cause nickel loss from the leach solution. Experimental results showed that maximum nickel dissolution of 99.2% at 95 °C could be reached in 120 min of leaching time for a sulphuric acid concentration of 60%. The congruency of Ni dissolution with respect to Fe was found to be congruent over about 25% Ni and 15% Fe dissolution values. XRD analyses on the residues obtained after leaching showed that it was not required to dissolve all goethite phase to reach maximum dissolution of nickel contained in the sample. An activation energy of 30.36 kJ/mole was determined for Ni dissolution showing that leaching is controlled by external diffusion and chemical reactions.     

江西某高岭土除铁提纯试验研究

江西某高岭土矿中含Al2O3 25.56%,Si O2 60.95%,属于典型砂质高岭土矿,但由于含铁量高,白度低,未能开发利用。采用SLon-J150浆料高梯度磁选机1粗1精工艺流程除铁,最终产品中Fe2O3含量降至0.12%,白度提高到95%以上,产率27%以上,达到造纸涂料行业对于高岭土产品技术要求。     

某钾长石矿SLon强磁除铁提纯工艺研究与应用

四川某钾长石矿中含K2O 9.81%,Na2O 2.25%,属于优质钾长石矿,但由于含铁量高,白度低,未能开发利用。采用SLon立环脉动高梯度磁选机3次除铁,最终工业生产钾长石产品中Fe2O3含量降至0.07%,白度提高到65%以上,产率在70%以上,获得优质钾长石产品。     

某砂质高岭土矿SLon浆料机除铁提纯试验研究

云南某高岭土矿中含Al2O323.27%,SiO264.28%,属于典型砂质高岭土矿,但由于含铁量高,白度低,未能开发利用。采用SLon-J150浆料高梯度磁选机2次除铁,最终产品中Fe2O3含量降至0.36%,白度提高到90%以上,产率22%以上,获得优质高岭土产品。     

某高氟铁矿脱氟工艺研究

对某高氟铁矿进行了系统脱氟工艺研究,查明了矿石中氟的赋存状态和嵌布关系,分别开展了阶段磨矿-弱磁选、阶段磨矿-弱磁选-淘洗和阶段磨矿-弱磁选-反浮选等脱氟工艺研究,结果表明,阶段磨矿-弱磁选-反浮选-浮选尾矿再磨再选工艺获得了产率27.23%、TFe品位66.34%、回收率70.98%、F含量0.38%的铁精矿,脱氟效果良好。     

吉林羚羊难选铁矿的选矿研究

羚羊铁矿石矿物组成非常复杂、嵌布粒度很细、铁矿物与脉石紧密共生,难以分选.对羚羊铁矿进行了选矿试验研究,结果表明,采用焙烧-磁选工艺处理羚羊铁矿,可获得铁品位60%以上,回收率70%以上的铁精矿,选别指标较以往有很大的提高,为羚羊铁矿的进一步研究和工业利用打下了基础.     

Sequential precipitation of Cu and Fe using a three-stage sulfidogenic fluidized-bed reactor system

The exposure of sulfides, such as pyrite (FeS₂) to water and air leads to the formation of acidic metal and sulfate containing waters, generally referred to as acid mine drainage (AMD). Under anaerobic conditions and in the presence of a suitable electron and carbon source, sulfate-reducing bacteria (SRB) can reduce sulfate to hydrogen sulfide which can precipitate metals as low-solubility sulfides. In the present study, a three-stage fluidized-bed reactor (FBR) system was operated at 35 °C with ethanol as an electron and carbon source for SRB to sequentially precipitate Cu and Fe from synthetic AMD. The system consisted of two pre-settling tanks before a sulfidogenic FBR for the sequential precipitation of Cu and Fe with biogenic H₂S gas and HS⁻ containing effluent, respectively. Cu and Fe precipitation efficiencies were over 99% and sulfate and COD removals 60-90%. Biologically produced alkalinity increased the initial pH of the AMD from 3.0 to neutral values.     

某复杂难选红铁矿磁化焙烧-磁选工艺及机理研究

对某复杂难选红铁矿进行了磁化焙烧-磁选工艺研究。试验结果表明, 在焙烧温度为950 ℃, 焙烧时间为15 min, 碳粉(0～1 mm)用量为15%, 磁场强度为0.16 T, 磨矿粒度-0.074 mm粒级占87%左右的条件下, 可获得Fe含量为63.06%、回收率为88.45%的铁精矿。磁化焙烧-磁选机理研究表明, 红铁矿经磁化焙烧后的产品呈疏松多孔结构, 有利于磨矿作业; 红铁矿在950 ℃下磁化焙烧15 min, 焙烧产品的物相仅为Fe₃O₄。     

Statistical validation of standardless and standard-based analysis by X-ray fluorescence spectrometry in iron ores characterisation

An X-ray fluorescence (XRF) study comparing the performances of standardless or semiquantitative analysis in relation to the traditional standard-based or quantitative analysis technique is presented. This comparison using precision lines and simultaneous confidence intervals provides reliable information about the precision and trueness that each technique can achieve. This study enables the comparison of the results obtained with two different analytical approaches for iron ore samples in terms of precision and accuracy of results, sample preparation and availability of standards. A new technique for assessing the accuracy of an analytical method using linear regression is presented, wherein the results of both analyses are regressed against certified reference materials. The statistical test performed is based on the joint confidence interval for the slope and the intercept of the regression line calculated considering the uncertainties in both axes or in both analytical methods. The slope, intercept and variances associated with the regression coefficients are calculated with bivariate least-squares regression. Some chosen standard-samples were analysed for statistical validation of the methods. These samples had sufficient replicates to perform the calculations and later statistical comparison between the accuracy (precision and trueness) of each analytical method and evaluation of its precision lines.