河南某低品位铁铜矿综合回收试验研究

河南某铁铜矿属矽卡岩型铁铜矿石类型，矿物组成比较简单，主要金属矿物为磁铁矿，其次为黄铜矿、黄铁矿、少量赤褐铁矿。铜矿优先浮选试验控制磨矿细度为-0.074 mm粒级占70%,以石灰作pH值调整剂和黄铁矿抑制剂，石灰用量1 500～2 000 g/t,脉石矿物抑制剂水玻璃用量为1 500 g/t,捕收剂丁铵黑药用量为50g/t,进行条件试验。经两粗三精两扫闭路流程试验，获得铜品位16.37%,铜回收率77.69%的合格精矿，实现低品位铜矿的有效回收。选铜尾矿进行磁选，经一次粗选，粗精矿再磨精选，获得铁品位65.50%,含硫0.13%,铁回收率53.53%的二级合格铁精矿。实现铁和低品位铜综合回收利用。     

四川锂辉石不加温浮选和低铁锂辉石选矿工艺研究

根据赋存锂辉石矿的伟晶岩中共生矿物的特性,用阴离子捕收剂浮选锂辉石,然后用阳离子捕收剂反浮选未被抑制的脉石,浮选粗精矿再通过脉动高梯度磁选除去含铁弱磁性矿物,最终获得低铁锂辉石。采用 PF 组合捕收剂将传统的加温浮选改为不加温浮选,可减少能耗,降低生产成本。     

某微细粒金矿石浮选试验研究

某金矿石为少硫化物金矿石,矿石中金矿物粒度细小,微细粒金矿物占89.15%。金矿物与脉石和黄铁矿关系十分密切,其中脉石矿物粒间金占62.19%,黄铁矿与脉石粒间金占17.82%,有13.58%的金矿物包裹于脉石矿物中。浮选试验磨矿细度为-0.075 mm占75%,捕收剂采用SK和丁基黄药优化组合,一次粗选,二次扫选,二次精选,在原矿金品位为1.88g/t时,试验获得金精矿金品位45.05g/t,金回收率为82.35%。     

金红石和钛铁矿的浮选性能研究

对三种钛矿物捕收剂的浮选性能作了试验比较。详细研究了新型螯合捕收剂水杨氧肟酸在各种条件下对金红石、钛铁矿以及其它几种伴生矿物和脉石矿物的捕收性能。     

某钨尾矿综合回收低品位萤石浮选试验研究

某钨尾矿有用矿物萤石嵌布粒度细,萤石含量低,单体解离难,石英、方解石等脉石矿物含量高,试验研究了该钨尾矿萤石和脉石矿物的浮选分离行为,通过条件试验,选择HY为萤石捕收剂,酸化水玻璃+HF为脉石矿物抑制剂,研究最终确定了一段一次粗选.七次精选工艺流程.结果表明:在钨尾矿含萤石8.12%的条件下,闭路试验获得了精矿CaF₂品位95.36%,回收率61.39%的选矿指标,实现了资源的综合回收.      

某选铁尾矿回收云母选矿试验研究

我国许多钢铁矿山企业铁矿石中伴生有云母,但在选铁过程中通常将其作为脉石矿物而随尾矿排放。某铁尾矿通过脱泥-碱性浮选选矿工艺研究可以回收产率10.17%,云母矿物含量96.19%的高纯度云母,有效地回收其中的云母资源,降低了尾矿排放量,具有良好的经济效益和社会效益。     

锂辉石浮选捕收剂及其构效关系研究综述

锂辉石浮选捕收剂的性能是影响锂辉石与脉石矿物浮选分离的关键因素。目前锂辉石浮选捕收剂主要包括：阴离子捕收剂、阳离子捕收剂、组合捕收剂以及新型捕收剂。单一的阴离子或阳离子捕收剂在浮选锂辉石时均需要高价金属阳离子做活化剂以及调整剂来控制活化过程的选择性,使用条件要求苛刻。与单一捕收剂相比,组合捕收剂能较好地提高对锂辉石的捕收能力和选择性,其中,阴阳离子组合捕收剂的效果相对较好,使用条件要求也较为宽泛,是目前锂辉石浮选捕收剂的研究热点。阴阳离子组合捕收剂可以通过捕收剂离子和分子与矿物表面的静电力、氢键和化学反应等,在锂辉石及脉石矿物表面表现出不同的作用形式,达到提高锂辉石浮选分离效率的目的。因此,基于锂辉石与脉石矿物理化性质差异,开展锂辉石浮选捕收剂构效关系研究,可为锂辉石高效浮选捕收剂的开发提供理论支撑,将是锂辉石浮选捕收剂研究的重要方向。     

青海某铁铜多金属矿石综合回收试验研究

青海某矽卡岩型铁铜多金属矿石中矿物嵌布粒度微细,伴生有闪锌矿、磁黄铁矿等矿物,且易泥化的蛇纹石、橄榄石、绿泥石等脉石矿物含量高。针对该矿石特征,进行了综合回收工艺研究。结果表明:采用铜硫混合浮选-中矿再磨-铜硫分离-弱磁选铁工艺流程,以及采用新型捕收剂和抑制剂相结合,在最佳试验条件下,获得了铜回收率75. 28%、全铁回收率73. 12%的较好指标,且伴生元素锌得到了综合回收。     

硫精矿浮选—焙烧综合利用硫酸烧渣中铁试验研究

为综合利用硫酸烧渣中的铁，采用浮选—焙烧工艺对硫酸烧渣原料硫精矿进行提纯除杂试验研究，考察了磨矿细度、抑制剂、捕收剂等对试验指标的影响。结果表明：在磨矿细度-0.074 mm占70%条件下，浮选作业添加高效抑制剂抑制脉石矿物，采用丁基黄药作为捕收剂，提高了精矿品位；闭路浮选试验获得的精矿进一步焙烧，通过控制适宜的焙烧条件，获得的硫酸烧渣铁品位达到65%以上，含硫低于0.4%,可作为铁精矿直接销售。该工艺能综合回收铁，使硫酸烧渣资源得到充分利用，可为企业带来显著的经济效益。     

螯合捕收剂GYX对钨矿物浮选行为影响研究

高效钨捕收剂是细粒级钨资源浮选回收的关键因素。通过单矿物浮选试验研究了新型螯合捕收剂GYX和经典捕收剂GYB对白钨矿、黑钨矿以及主要脉石矿物的浮选行为影响，结果表明：采用GYX捕收剂对白钨矿和黑钨矿的最高浮选回收率与采用GYB相近，对萤石的浮选回收率比采用GYB低5个百分点，捕收剂药剂用量减少约50%。在此基础上，以某萤石含量高的钨多金属矿为试验对象，在原矿磨矿细度为-0.074mm占82.35%条件下，对含WO₃ 0.34%、CaF₂ 29.42%的原矿，采用GYX作钨捕收剂，进行钨浮选闭路试验可获得含WO₃ 40.57%、钨回收率为74.90%的钨精矿，取得较好的试验指标。     

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.     

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 ％ 。     

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.     

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.     

邯宝炼铁厂高块矿配比生产实践

对邯宝炼铁厂高块矿配比生产进行了总结,在炉役末期通过紧抓原料管理、高炉操作优化等措施,2019年块矿使用比例达到21.5%的较高水平,降低了生产成本。     

济钢炼铁厂鱼雷罐残铁再回收利用实践

济钢炼铁厂鱼雷罐为炼钢铁水重要的输送工具,因鱼雷罐在炼钢或铸铁机工序无法完全翻转,罐内剩余残铁均较多。原有方式为将鱼雷罐送入翻渣间,向残铁盆和残渣盆内分别倾倒,形成残铁块和残渣。此种方式收集的残铁块含渣量大、质量不稳定,炼钢生产难以消化,只能扣除一定比例亏吨后作废钢处理,与正常生产的生铁成本差价较大,仅此项每年直接损失近千万元,造成巨大的浪费,因此需采取必要的措施对鱼雷罐内残铁进行合理的回收,以降低炼铁生产成本。     

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。