硫化矿捕收剂的研究进展

综述了硫化矿捕收剂的合成及浮选应用,混合捕收剂与组合用药的应用现状,捕收剂在硫化矿表面的作用机理。研究捕收剂分子结构和它们与矿物表面的作用机理,为硫化矿物新药剂的分子设计、开发与应用提供了理论指导。     

硫化矿捕收剂的研究进展

综述了硫化矿捕收剂的合成及浮选应用,混合捕收剂与组合用药的应用现状,捕收剂在硫化矿表面的作用机理。研究捕收剂分子结构和它们与矿物表面的作用机理,为硫化矿物新药剂的分子设计、开发与应用提供了理论指导。     

非硫化矿捕收剂的研究进展

综述了非硫化矿捕收剂的合成及应用现状,以及捕收剂在矿物表面的作用机理,重点介绍了羟肟酸和阳离子反浮选捕收剂的应用。研究捕收剂与矿物表面的作用机理,为非硫化矿新药剂的开发和应用提供理论指导。     

硫化镍矿中镍提取技术研究进展

作为一种战略金属,镍广泛应用于不锈钢、特殊金属合金、二次电池等领域。近年来,随着新能源汽车产业的快速发展以及动力电池正极材料“无钴高镍”发展趋势,对镍的需求量持续攀升。然而,我国镍资源的对外依存度高达86%,供需矛盾日益突出。针对镍冶炼主要原料的硫化镍矿开采、富集较为困难,传统冶炼方法存在回收率低、环境风险高等瓶颈问题,本研究在分析硫化镍矿矿物学特性的基础上,系统综述了硫化镍矿中镍提取技术的研究进展及存在的问题,综合考虑镍的回收率、物质和能量消耗、环境影响等因素,提出了强化硫化镍矿中镍提取技术研发的建议,同时对硫化镍矿中镍提取技术发展趋势进行了展望。     

硫化铜矿石浮选捕收剂的最新研究进展

对硫化铜矿石浮选捕收剂进行了分类并进行了系统的分析与归纳,综述了硫化铜矿石浮选捕收剂的制度和浮选工艺。指出开发新型高效无毒的捕收剂是硫化铜矿石浮选研究的重点和发展方向,采用低碱度铜硫分离工艺和应用组合捕收剂浮选可提高硫化铜矿石的浮选性能和效果。     

硫化铜矿石浮选捕收剂的最新研究进展

对硫化铜矿石浮选捕收剂进行了分类并进行了系统的分析与归纳,综述了硫化铜矿石浮选捕收剂的制度和浮选工艺。指出开发新型高效无毒的捕收剂是硫化铜矿石浮选研究的重点和发展方向,采用低碱度铜硫分离工艺和应用组合捕收剂浮选可提高硫化铜矿石的浮选性能和效果。     

萤石浮选捕收剂研究进展

萤石捕收剂可分羧酸类、生物脂类、两性捕收剂 、复合捕收剂、烷基膦酸和烷基硫酸(烷基磺酸)等五类,其中绝大部分属化工厂副产品。羧酸类(油酸或油酸盐)仍然是萤石浮选的主要捕收剂。使用两性捕收剂能改善萤石-方解石分离的选择性,而生物脂类则可有效排除萤石精矿小的二氧化硅。     

硫化钼镍矿加碱焙烧后钼镍的回收率分析

通过焙烧、水浸实现了原生硫化镍钼矿中镍和钼的分离,得到的较优工艺条件为:焙烧时,原矿和无水碳酸钠质量比1:0.9、560℃焙烧6h,650℃焙烧1.5h,焙砂中镍品位为2.67%,钼品位为5.81%;在固液比1:4,温度95℃的条件下,水浸焙烧渣2h,98.21%的镍留在滤渣中,95.43%的钼进入滤液,有效地实现了钼...     

硫化铅锌矿浮选分离研究进展

铅锌分离目前仍是选矿领域的一大难题,介绍了闪锌矿和方铅矿的晶体结构与可浮性,指出了优先浮选、混合浮选、等可浮浮选和异步浮选等传统工艺以及电化学浮选、分支浮选、载体浮选和高浓度浮选等新工艺的特点和适用对象;综述了硫化铅矿捕收剂、硫化锌矿捕收剂、硫化铅锌矿调整剂的研究现状;分析指出了浮选分离工艺的发展方向为高浓度浮选工艺、低碱工艺和无氰工艺等绿色工艺,优化药剂制度和研发环保高效新药剂是未来硫化铅锌矿选矿药剂研究的重要方向。     

黄铜矿浮选工艺及捕收剂研究进展

阐述了黄铜矿的矿物特征和浮选特性,对黄铜矿的浮选工艺、新型浮选捕收剂以及浮选捕收剂的组合应用进行了概述,认为研制出捕收性能强、选择性好的新型捕收剂是黄铜矿浮选捕收剂的发展方向。     

国外某硫化镍矿选矿新药剂的研究

采用生产现厂的工艺流程，筛选出了AT－1、AT－2及0#油组成的组合药剂。通过现厂药剂制度与采用组合药剂的新药剂制度的对比试验，解决了镍精矿含镁高和回收率偏低的问题。     

Electroless nickel current collector for 3D-microbatteries

An electroless nickel process was used for the preparation of a thin-film current collector for concentric three-dimensional lithium and lithium-ion microbatteries. Ni–P coatings were deposited autocatalytically with the use of nickel sulfamate or nickel sulfate as a source of Ni²⁺ and sodium hypophosphite as a reducing agent. The synergistic effect of sodium acetate and citric acid was found to provide marked improvement in the pH stability of the sulfamate electrolyte. This enabled deposition of a conformal, fine-grained film on the high-aspect-ratio glass capillary and perforated-silicon substrates.     

Catalytic properties of nickel molybdenum sulphide supported on zirconia

Zirconia has been investigated as a support material for Mo and NiMo sulphide catalysts. Thiophene HDS studies (1 atm, 400°C) reveal that the ZrO₂-supported Mo catalysts are twice as active as the corresponding Mo/Al₂O₃ catalysts. The promoting effect brought by nickel, however, is much smaller than expected in comparison with alumina supported catalysts; the use of zirconia induces higher hydrogenation selectivity. It is suggested that the promoter ions interact with both the Mo sulphide slab and the zirconia carrier, which results in a change in properties of the mixed catalytic sites.

The increased selectivity towards hydrogenation may be an important advantage when dealing with hydrodenitrogenation processes. Indeed, in catalytic tests carried out at 70 atm, 350°C, 2,6-diethylaniline reacts more rapidly over zirconia catalysts ; similarly, the hydrogenation route is well developed in the complex reaction scheme of quinoline. However the inhibiting effect of quinoline (or 1,2,3,4-tetrahydroquinoline) upon the reactivity of alkylanilines is as strong on zirconia supported as on alumina supported catalysts.

Nevertheless, the beneficial effect of the zirconia carrier is observed in the HDN of the less reactive phenanthridine molecule (140 atm, 340°C), and also in the HDN of real feed in a pilot test.     

Electrodissolution of nickel sulphide concentrates in ferrous chloride solutions

A 3 M ferrous chloride solution of pH 1.5 and operated at 72° C was found suitable to electro-oxidize nickel sulphide concentrates containing the following constituents in wt.%: nickel 20, iron 8, magnesium 10, silicon 8, sulphur 11 and copper 0.83.The percentages of dissolution for 16 A h at current passed (current density 20–120 mAcm^–2 with respect to graphite) were in the ranges: Ni 90–70; Cu 70–50 and Mg 20–15. The changes in mol % of the final (mainly elemental) sulphur to initial sulphide-sulphur were in the range of 50 to 25. On the other hand the mole ratio of initial to final iron decreases, and this relates to the precipitation of hydroxides. Corresponding to these changes, the X-ray diffraction patterns detected the presence of elemental sulphur and hydrated oxides of iron and magnesium. The anolyte pH and electrode potential were followed during the electro-oxidation experiments.Experiments were carried out to establish the feasibility of separating copper from nickel chloride-copper chloride mixtures at 75° C. It was possible to separate copper whose concentration was 5 gl^–1 or above while that of nickel was 75 gl^–1. The cathodic polarization curves for copper, nickel and hydrogen discharge from their individual and binary mixtures were used to predict the conditions required to avoid copper-nickel alloy deposition, and the efficiencies of deposition.     

Hydrogen evolution at nickel sulphide cathodes in alkaline medium

Hydrogen overpotentials at nickel sulphide cathodes have been measured in 1 N NaOH. The nickel sulphide catalysts have been examined for their structure and composition using scanning electron microscopy (SEM) and microprobe analyses. Nickel sulphide electrodes exhibit a transient behaviour during cathodic polarization. A significant increase in performance could be noticed accompanied with a clear change in the mechanism of the evolution reaction. Voltammetric measurements show a first anodic peak around ?0.95 C and a second broad peak around ?0.65 V. On the basis of galvanostatic potential curves, both anodic peaks have been attributed to oxidation reactions involving hydrogen; a strongly bonded hydrogen and a dissolved or weakly absorbed hydrogen. It is the formation of the strongly absorbed hydrogen structure which is believed to be the main cause of the observed transient behaviour of the nickel sulphide electrodes.     

Biological leaching of nickel and cobalt from lateritic nickel ore of Sukinda mines

In the present study lateritic nickel ore was used for bacterial leaching using a mixed consortium of mesophilic acidophiles. The microorganisms were adapted to 1 gram nickel/L prior to leaching. For the experiments, lateritic ore in different forms such as raw, roasted, roasted ore presoaked in dilute sulphuric acid and palletized pretreated roasted (400 °C and 600 °C) ore were taken. The leaching experiments were conducted in 9 K+ with 40 L capacity bioreactor using 10% (v/v) inoculum concentration at 10% (w/v) pulp density. The aeration was maintained at 2–3 L/min and the speed of agitator and temperature at 400–500 rpm and 35 °C. The maximum extraction of nickel and cobalt was observed with pretreated ore (600 °C) at 10% pulp density (77.23% and 73.22%) respectively within 31 days at pH 1.5 and least extraction in case of raw ore i.e., 9.47% nickel and 41.12% cobalt respectively.     

硫镍矿精制碳酸镍工艺选择

本文对湖南某地出产的毓镍矿经精制得到二级品碳酸镍的两种工艺进行比较，得到一种比较理想的除杂精制碳酸镍方案，     

低品位多金属铅锑硫化矿中湿法提取锑工艺研究

通过研究氯化湿法浸取低品位多金属铅锑硫化矿工艺,得到提取锑最佳工艺条件：通氯气的量为理论量的1.2倍、温度为90 ℃、浸取时间为4 h、固液质量体积比为1/4 g/mL。在最佳工艺条件下,锑的浸取率为99.5%,浸取液循环使用4次后锑浸取率无明显变化。该工艺解决了复杂多金属铅锑硫化矿通过选矿不能解决的多金属分离问题,在氯化浸取过程中很好地实现了锑的分离,矿产资源的利用程度大大提高,有利于资源综合开发利用和环境保护。     

红土镍矿浸出液除杂制备氢氧化镍

以低品位硅镁型红土镍矿硫酸浸出液为原料,用黄钠铁矾[Na2Fe6(SO4)4(OH)12]除铁、NaF除镁、中和沉镍,考察了不同因素的影响。结果表明,添加4 mL/L双氧水对浸出液氧化预处理、用Na2SO4为除铁钠源、控制溶液pH为1.6?2.2、反应时间1.5 h的条件下,铁去除率达92.1%,镍损失率为6.7%,滤渣主相为Na2Fe6(SO4)4(OH)12;除铁后滤液用NaF除去镁离子,最优条件为搅拌速率300 r/min、溶液pH=5.5?6.0及NaF 用量25 g/L,镁去除率达90.9%,镍损失率为6.8%;除杂后净化液用中和水解法提镍,在室温下添加8 g/L NaOH为沉镍剂,中和沉镍提取率达95.1%,得到纯度99.5%的Ni(OH)2产品,镍的综合回收率为82.70%。