高铁硫化锌精矿的真空铁还原

开展了真空下铁还原高铁硫化锌精矿的热力学分析和试验研究.在整个还原过程中锌以单质形式冷凝回收,直收率达95%左右,矿物中的硫主要以FeS的形式固定.通过试验研究确定了真空下铁还原高铁硫化锌精矿较好的工艺条件.     

高铁硫化锌精矿的真空铁还原

开展了真空下铁还原高铁硫化锌精矿的热力学分析和试验研究,在整个还原过程中锌以单质形式冷凝回收,直收率达95%左右,矿物中的硫主要以FeS的形式固定.通过试验研究确定了真空下铁还原高铁硫化锌精矿较好的工艺条件.     

京唐1号高炉三铁口出铁试验

对京唐1号高炉三铁口出铁试验进行了总结.三铁口出铁试验取得成功,不仅得益于前期制订了详细的方案,还得益于炉内采用高球团矿比生产后,渣铁比的降低减轻了对冲渣的影响.死料堆洁净指数及炉芯温度指标的变化表明,三铁口出铁有利于改善炉缸活跃度.但是,由于三铁口出铁试验较短,尚不能证明三铁口出铁能减轻铁水环流.三铁口出铁能否减缓对...     

江西某铁尾矿综合回收铁试验研究

江西某铁矿主要为褐铁矿,该矿含泥含水大且可选性差,采用磁化焙烧-磁选方法进行试验研究,获得了较为理想的试验指标。     

低品位稀土精矿球团高炉脱铁工业试验

工业试验是在小型试验基础上进行的.其内容包括低品位(REO30%)稀土精矿球团(以下简称稀土球团)高炉脱铁工艺参数测定,物料平衡测试,试验前和试验时环保测试及工业试验经济技术指标的确定.还对本工艺试验与矿热炉脱铁工艺进行了经济对比.试验证明稀土球团高炉脱铁工艺,技术和经济上是可行的.已经生产出1000余吨合格的脱铁渣(REO27%~33%,TEe≤1.0%,P_20_5<1.0%).     

重铬酸钾容量法测定镝铁合金中的铁量

采用重铬酸钾容量法测定了镝铁合金中的铁,系统考察了有关试剂加入量对测定结果的影响,并进行了精密度及标准回收试验.此方法准确、快速.     

铁尾矿废石资源化利用试验研究

试验以铁化学物相、放射性分析、粒度分布、化学成分分析为基础,开展铁尾矿废石做建筑骨料试验,细粉及废石做超细粉试验,对开拓铁尾矿废石资源化利用途径进行可行性分析.     

从金矿浮选尾矿中回收铁的试验与生产实践

对河南省某金矿浮选尾矿进行了磁选-分级回收铁精矿的试验.试验结果表明,该浮选尾矿中的铁矿可以实现低成本回收利用,能够为企业带来较好的经济效益.     

某选铁尾矿回收铁的选矿工艺研究

某选铁尾矿含铁28.04%,该尾矿主要是选铁洗矿过程中的溢流部分,其粒度非常细。针对该尾矿特点,进行回收铁的试验研究。通过多方案的对比,最终采用矿浆分散-磁选-浮选的联合试验流程,其闭路试验可得到含铁58.77%的铁精矿,铁回收率68.58%,使该尾矿资源得以综合利用,提高了企业的经济和社会效益。     

梅山铁矿石高压辊磨试验研究与应用探讨

采用德国洪堡公司的RP80/25型高压辊磨机对梅山选矿厂细碎产品进行了半工业试验,研究了能耗、水分、通过量及循环负荷等因素对辊压效果的影响.闭路试验结果表明,梅山铁矿石适合采用高压辊磨机粉磨,而且作业能耗降低25%～30%,有利于工序的节能降耗,同时有利于提高生产效率和改善磨矿效果.依据上述试验结果,提出了梅山应用高压辊磨机的技术方案,同时指出了工艺配置中亟待解决的一些技术问题.     

关于铁精粉中是否含有铁屑的检测

通过对铁精粉的外观、制样等情况判断几种铁精粉中含铁屑的检测方法.     

梅山铁矿尾矿浮选铁的试验研究

梅山铁矿尾矿组成复杂,脉石矿物的物理性质与铁矿物相近,分选困难。采用强磁选脱泥,脱泥精矿正浮选,以甲苯胂酸作铁矿物捕收剂,六偏磷酸钠作脉石矿物抑制剂,煤油为辅助捕收剂,通过一粗二精一扫流程,得到铁品位63.47%的合格铁精矿,回收率为24.04%。     

从江西某铁矿尾矿中回收铁精矿

江西某铁矿主要金属矿物为褐铁矿,矿石含泥含水且可选性差,采用磁化还原焙烧法可改善矿石的分选性.结果表明,在950～1 000℃、褐煤用量15%～20%条件下焙烧2 h,焙砂在87.55 kA/m磁场强度下进行磁选,铁精矿产率51.46%,全铁回收率78.88%,效果较好.     

原料生铁与铸件组织遗传性研究

研究了４ 种不同产地的常用原料生铁的原始组织、相同过热温度下原料生铁与铸铁（ＨＴ２００）的组织和力学性能。结果表明,原料生铁中粗大石墨结及石墨片的大小和分布在低于１ ４５０ ℃的熔炼条件下,具有明显的遗传效应。由于原料组织的遗传效应造成铸件的抗拉强度相差近２０ ％ 。     

Iron supplementation

BACKGROUND: Besides decentration of the graft/host trephination and "horizontal torsion" "vertical tilt" is an important factor for reduced visual outcome after penetrating keratoplasty (PK). The purpose of this study was to evaluate the time course of vertical tilt in absolute value and direction and to correlate it with functional results after PK. PATIENTS AND METHODS: Fifty patients each (20 primary dystrophies, 30 keratoconus) underwent nonmechanical trephination (NMT) (excimer laser MEL60, Aesculap-Meditec, Heroldsberg, Germany) or mechanical motor trephination (MT) (Geuder, Heidelberg, Germany) in penetrating keratoplasty. All procedures (7.5 mm in dystrophies, 8.0 mm in keratoconus, 8 orientation teeth in NMT, double-running 10-0 nylon suture) were performed by one surgeon (GOHN). At a postoperative gate of 6 weeks, 6 months, before partial suture removal and after complete suture removal, corneal topography analysis (TMS-1, Tomey, Tennenlohe, Germany) was performed. After a Gram-Schmidt-orthogonalization corneal topography height data of 25 noncentric rings in 256 hemimeridians were decomposed into Zernike components of radial order n = 16 in the sense of minimizing the root mean square error. The tilt of the surface relative to the videokeratoscope axis was calculated from the Zernike components Z1(1) and Z1(-1). The meridional power at the cardinal meridians was derived from all parabolic Zernike terms. Tilt and the difference between both meridians of the Zernike representation (ZA) were correlated with the results of Zeiss keratometry (KA). Simulated Keratometry (SimK) of the TMS-1, subjective refraction (RZ) and best-corrected visual acuity. RESULTS: After NMT, vertical tilt of the graft was 3 degrees without significant change over time. Following MT, an equivalent time course could be observed before partial suture removal. However, after complete suture removal, a significant increase of the tilt was measured to 5 degrees (p = 0.02). No significant difference could be detected comparing keratoconus and Fuchs' dystrophy both in NMT and MT. The direction of the vertical tilt component piled up to the hemimeridian defined by the knot of the first running suture. At all postoperative follow-up examinations, the ZA of the Zernike decomposition showed a good correlation to the RZ, whereas the KA and the SimK did not. At the end of the follow-up, best-corrected visual acuity after NMT was 2 decimal lines better than after MT. CONCLUSIONS: The Zernike decomposition of topographic height data is a suitable tool for extraction and quantifying vertical tilt of the graft following penetrating keratoplasty. In contrast to conventional keratometry with its 4-point measurement, a decomposition of topographic height data into orthogonal polynomials enables a detection of both cardinal meridians even in corneas with a high degree of local irregularities.     

白云鄂博矿选铁尾矿中铁矿物的工艺矿物特征

白云鄂博矿矿区矿产资源丰富,氧化矿尾矿即将作为主要生产原料应用于白云鄂博矿综合利用示范基地生产线。文章以实验室氧化矿尾矿与磁铁矿尾矿为试验试样,根据粒度划分为5个不同粒级,旨在测定显微镜下上述尾矿的化学成分和粒度分布,同时深入研究其铁矿物的矿物组成和解离特性,从而为选铁工艺的优化提供必要的理论依据与技术支持。     

Recovery of Ultra-Fine Iron Ore from Iron Ore Tailings

Many attempts has been taken for further utilisation of the tailings and slimes through different routes i.e. beneficiation, agglomeration etc. Though the slimes and tailings contain huge ultra fines, conventional beneficiation methods many not be much effective for handling because of particle size limitations. Physicochemical method i.e. selective flocculation is a process for handling the ultrafine particles present in the tailings. Review shows that selective flocculation technique have very limited commercial application. Here the study focuses on the application of selective flocculation process for beneficiation of synthetic mixtures of iron ore and kaolinite as well as iron ore tailings. Results show that it is possible to achieve 65.78(%) of Fe, with 2.65% Al₂O₃, 3.66 SiO₂ (%) in the concentrate using synthetic mixture feed and more than 60% of Fe is obtained from natural iron ore tailings.     

高铁硫化矿选择性浸出铁的研究

将镍钴火法冶炼转炉渣进行还原硫化,制备成富含镍钴铜的高含铁硫化矿,并采用加压选择性浸出其中的铁。对铁的浸出行为进行了研究。结果表明,随着铜浸出率从98%降到-42%,铁浸出率从3%升到43%左右,选择性浸出后液含铁越来越高,而且以二价铁居多,这是造成高铁硫化矿难以进行加压选浸的主要原因。     

磁化焙烧对高铁铝土矿中铁元素的分离回收影响

对铝土矿进行磁化焙烧—磁选处理,考察氢气通入量,焙烧温度及焙烧时间对铁回收率和品位的影响,并研究不同焙烧条件下矿石中铁元素的分离规律。结果表明,当氢气流量为40mL/min、400℃焙烧75min后,铝土矿中铁的回收率及回收品位最优,分别为69.58%和44.59%,能较好实现铁质元素的分离和回收。该条件下焙烧磁选后的铝精矿氧化铝的实际溶出率为86.2%,比未经过焙烧磁选的铝土矿提高了6.6个百分点。