钛铁矿流态化氧化机理研究

对低品位钛铁矿进行预氧化、预还原等预处理后可满足硫酸法生产钛白粉工艺所需高品位钛铁矿的要求。本试验采用流态化预氧化方法处理风化程度低、含硫较高的钛铁矿。结果表明 :流态化氧化可大幅度地降低钛铁矿中硫含量 ;钛铁矿流态化氧化的适宜温度为 :80 0～ 90 0℃ ,且在此温度范围内 ,随温度的升高 ,钛铁矿的氧化速度增加 ,在 90 0℃时 ,5 0min钛铁矿基本能完成氧化     

用“微波辐照——盐酸浸出法”制备酸溶性富钛渣的研究

本探讨了将微波这一新技术应用在钛铁矿冶金的可行性．结果表明,钛铁矿精矿经“微波辐矿经”微波辐照——盐酸浸出法”能制得供硫酸法生产钛白的酸溶性富钛渣,且具有方法新、能耗低、工艺简便等特点．     

Use of heavy fraction of bio-oil as fuel for hydrogen production in iron-based chemical looping process

Chemical looping hydrogen (CLH) process with renewable energy sources as fuel shows the potential of producing pure hydrogen with inherent capture of CO₂ in a low-cost and sustainable way. The heavy fraction (HF) of bio-oil, derived from the fast pyrolysis of biomass and characterized as an energy carrier with difficulty in upgrading itself to bio-fuel or chemicals, was used in this study to generate H₂. Four low-cost iron-based oxygen carriers including an ilmenite and three iron ores were initially evaluated with respect to their reducibility and the ability to minimize carbon or iron carbide (Fe₃C) formation in a thermogravimetric analyzer (TGA). The reactivity and cyclic performance of the selected best candidate was then assessed in a laboratory scale fixed-bed reactor with HF bio-oil as fuel. The screening test in TGA showed that ilmenite was superior over the three iron ores in terms of promoting CO conversion and minimizing carbon or Fe₃C formation. Ilmenite could maintain its increasing reducibility with the increase of surrounding CO concentration, in contrast with the iron ores that were deactivated seriously by the formed carbon or Fe₃C. Subsequent CLH test with ilmenite and HF bio-oil showed that the reducibility and H₂ production capacity of ilmenite were strongly dependent on the operating temperature. The steam oxidation step at 950 °C yielded H₂ concentration and hydrogen yield exceeding all of those observed at the other investigated temperatures because of the deepest reduction degree of ilmenite at 950 °C. The decrease in the reducibility and H₂ production capacity of ilmenite in the cyclic test could be ascribed to the poorer physical structure of ilmenite with cycles.     

Ilmenite with addition of NiO as oxygen carrier for chemical-looping combustion

The naturally occurring mineral ilmenite, FeTiO₃, has been examined as oxygen carrier for chemical-looping combustion. NiO-based particles have been used as an additive, in order to examine if it is possible to utilize the catalytic properties of metallic Ni to facilitate decomposition of hydrocarbons into more reactive combustion intermediates such as CO and H₂. Firstly, ilmenite was examined by oxidation and reduction experiments in a batch fluidized-bed reactor. These experiments indicated moderate reactivity between ilmenite and CH₄, which was used as reducing gas. However, adding 5 wt.% of NiO-based particles to the ilmenite improved the conversion of CH₄ greatly, resulting in an increase in combustion efficiency with a factor of 3. Secondly, 83 h of chemical-looping combustion experiments were conducted in a small circulating fluidized-bed reactor, using ilmenite as oxygen carrier and natural gas as fuel. A wide range of process parameters and different levels of NiO addition were examined. Occasionally, there were problems with the circulation of solids between the air reactor and fuel reactor, but most of the time the experiments worked well. The products were mostly CO₂, H₂O and unconverted CH₄. Adding small amounts of NiO-based particles to the reactor increased the conversion of the fuel considerably. For the base case conducted at 900°, the combustion efficiency was 76% for pure ilmenite and 90% for the corresponding experiments with 1 wt.% NiO-based particles added to the reactor. The properties of ilmenite were found to change considerably during operation. Used particles had lower density, were more reactive and more porous than fresh particles. These changes appear to have been physical, and no unexpected chemical phases could be identified.     

一种含羟基烷叉双膦酸钛铁矿捕收剂的合成及浮选性能研究

采用油酸与亚磷酸、三氯化磷反应,合成了一种含羟基烷叉双膦酸的钛铁矿捕收剂,并进行了钛铁矿浮选试验,获得了钛精矿产率38.82%,TiO2品位47.52%,回收率75.82%的技术指标。该捕收剂选择捕收性能优良,合成工艺简单,利于在工业上推广应用。     

攀钢密地选钛厂4万吨微细粒级选钛工程浮选尾矿治理

简要介绍了攀钢密地选钛厂微细粒级 4万 t选钛工程的基本工艺流程 ,较详细地分析了所设计的尾矿处理设备不能达到生产要求的原因 ,并从理论和实践上提出了解决问题的具体措施     

钛铁矿制备纳米钛基材料的研究

以廉价易得的天然钛铁矿为原料,采用"机械球磨活化+碱浸"工艺制备FeTiO_3纳米花,采用"机械球磨活化+碱浸+酸浸"工艺制得TiO_2/FeTiO_3纳米微粒。首先通过机械球磨活化减小钛铁矿的物理尺寸,使其化学性质变得活泼,然后通过碱浸的方法得到呈三维花瓣状的FeTiO_3纳米花,最后纳米花进一步酸浸得到规则的TiO_2/FeTiO_3纳米微粒。通过分析FeTiO_3纳米花和TiO_2/FeTiO_3纳米微粒的形貌和物相组成,得出结论碱浸时较优的NaOH浓度为1mol/L,碱浸时间为2h,酸浸时较优的HCl浓度为2mol/L,酸浸时间为8h。较优条件下获得的FeTiO_3纳米花厚度在25nm左右,长度在200～400nm之间,TiO_2/FeTiO_3纳米微粒直径在30nm左右。通过分析碱浸和酸浸的机理,可知反应过程中都有不稳定液相中间产物的生成,运用溶解和中间体水解产生沉淀的机理进行了解释,中间体的生成和水解平衡受酸或者碱浓度的影响。     

带式永磁磁选机选别攀枝花钛铁矿的试验研究

新型带式中强磁场永磁磁选机选别攀枝花钛铁矿的小型试验研究表明：磁尾分级后，经一次选别作业可得TiO2品位15％左右，回收率80％以上，丢弃尾矿产率40％左右的较好指标。该设备具有处理能力大、生产费用低、占地面积小、操作管理方便等优点，是该矿石粗粒级的理想粗选设备。     

云南某半风化钛铁矿工艺矿物学研究

运用多元素分析、X射线衍射分析、扫描电镜和镜下鉴定等手段,对云南某半风化钛铁矿进行了详细的工艺矿物学研究。研究该半风化钛铁矿的化学组成、主要矿物组成、粒度组成、嵌布特征及矿物单体解离等工艺性质。结果表明,原矿中金属矿物主要为钛铁矿、磁铁矿和赤铁矿;非金属矿物主要为斜长石、辉石,少量钾长石。该研究为此类半风化钛铁矿的合理开发利用提供了参考依据。     

钛铁矿选矿技术研究与应用

主要介绍了目前我国钛铁矿的储量及分布特点,评述了我国钛铁矿资源的选别工艺,包括重选、磁选、浮选、电选及联合工艺,指出了各选矿工艺优缺点及应用范围,并提出了今后研究重点在于新药的研发及微细粒级钛铁矿的回收方面。