红土镍矿干燥特性的研究

研究了红土镍矿的干燥特性,在220℃下恒温干燥红土镍矿,干燥介质为220℃空气,当提高空气的温度及流速,物料呈流化状态时,干燥率大幅提高,干燥时间明显缩短。用扫描电镜(SEM)观测红土镍矿的形貌及表面形态,用差示扫描量热法(DSC)研究其热性能。红土镍矿干燥特性的研究可为其预烘干及焙烧工艺的选择提供技术依据。     

红土镍矿处理工艺探讨

随着硫化矿资源的日益匮乏,镍产量的扩大将主要来源于红土矿.红土镍矿的典型处理工艺有湿法和火法之分,湿法工艺适于处理褐铁矿,火法工艺适于处理硅镁镍矿.我国虽有一定量的红土镍矿,但品位较低.国内进口的菲律宾红土镍矿是典型硅镁镍矿,将其先采用回转窑干燥脱水及焙烧,然后采用电炉还原熔炼镍铁具有广阔的前景.     

红土镍矿处理工艺探讨

随着硫化矿资源的日益匮乏，镍产量的扩大将主要来源于红土矿。红土镍矿的典型处理工艺有湿法和火法之分，湿法工艺适于处理褐铁矿，火法工艺适于处理硅镁镍矿。我国虽有一定量的红土镍矿，但品位较低。国内进口的菲律宾红土镍矿是典型硅镁镍矿，将其先采用回转窑干燥脱水及焙烧，然后采用电炉还原熔炼镍铁具有广阔的前景。     

某难处理低品位红土镍矿的矿石性质探讨

随着硫化镍矿资源的减少,红土镍矿具有埋藏浅,采矿成本低的优势,红土镍矿开发利用研究逐渐受到重视。红土镍矿成因复杂,镍、铁与镁相互晶格替代后以类质同象方式形成红土镍矿,镍钴赋存于矿物晶格中,采用常规选矿工艺不能富集金属镍。采用火法或湿法冶金工艺处理高品位红土镍矿,具有吨镍生产成本低、能耗低的优势。深入研究红土镍矿的矿石性质,合理选择低成本、低污染的处理技术工艺,是成功开发红土镍矿的关键环节。     

缅甸达贡山红土型镍矿配矿工艺

随着不锈钢和电池行业的快速发展,对镍的需求也不断的增加,用来生产金属镍和镍铁合金的红土型镍矿得到了很大程度的开发。作为东南亚镍资源大国缅甸拥有丰富的红土型镍矿,深入了解红土型镍矿的地质特征及配矿工艺,合理开发利用镍矿资源,缓解我国镍资源紧缺现状。本文对红土型镍矿成矿机理及红土型镍矿生产工艺进行诠释,并对缅甸达贡山镍矿项目配矿方法及取得的经济效益进行详细介绍。     

红土镍矿湿法冶金工艺现状及前景分析

随着硫化镍矿资源的不断消耗以及镍需求量的持续增长,红土镍矿将是未来镍的主要来源。红土镍矿具有储量丰富、易开采、便于运输等特点,成为研究开发的热点。对还原焙烧 氨浸工艺、加压酸浸工艺、常压酸浸工艺等湿法冶金处理红土镍矿的工艺特点及现状进行了阐述,并分析了各工艺的优势与不足,介绍了红土镍矿湿法冶金工艺的研究进展。最后探讨了未来红土镍矿湿法冶金工艺的发展前景,指出加压酸浸工艺将在今后红土镍矿湿法冶金中扮演重要角色。     

红土镍矿烧结生产实践研究与探讨

红土镍矿烧结生产是火法冶炼提取镍的关键工序,通过总结分析低镍高铁低硅红土镍矿烧结生产实践,对红土镍矿配矿方案的关键点、工艺参数进行了讨论,对烧结生产改进方向提出了看法,对降低高炉冶炼镍铁成本进行了探讨,同时对在不同红土镍矿原料条件下的烧结生产提出了建议。     

低品位镍矿直接还原-磁选富集工艺半工业试验研究

为充分利用红土镍矿,详细阐述了低品位镍红土矿直接还原-磁选富集工艺技术。通过半工业试验,探讨研究了影响低品位红土镍矿冶直接还原-磁选富集的主要工艺技术参数,证明了该工艺处理低品位红土镍矿的可行性,实现了低品位红土镍矿的有效利用。     

印尼红土型镍矿成矿规律研究

为充分准确掌握印尼红土型镍矿矿石矿物性质以及其成矿规律,制定合理的矿石选矿技术方案,对印度尼西亚某矿区红土矿和镍矿石性质进行了分析工艺原理矿物学分析,通过对该地区的矿物质的调查,以及红土镍矿在成矿时的普遍规律进行勘察。查明了该矿区红土镍矿的主要矿物结构组成和化学成分含量,主要研究矿物的粒度变化分布、Fe、Ni、Cr、Co等的分布特征、元素的状态。结果表明：该区红土镍矿中矿石矿物颜色种类繁多,以红色蛇纹石和红色褐铁矿矿物为主,绿色矿物绿泥石次之;石英、铬锌锰铁矿、磁铁锰镍矿和褐色辉石;同时在印尼地区因为地域环境的因素,红土镍矿的成矿大多位于印尼的北部,本文通过对印尼红土镍矿成矿规律以及成矿细节的详细调查,通过调查来探究详细的印尼红土镍矿的成矿规律。     

红土镍矿冶金综述

随着社会工业的快速发展,镍的消耗不断增加,含镍品位较高的硫化镍矿也日益枯竭,有效开发和利用红土镍矿受到越来越多国家的重视。文章主要分析了红土镍矿资源的矿物特点及其国内外的开发现状,详细介绍世界冶金工业中处理红土镍矿的生产工艺及其优缺点。通过分析红土镍矿提取镍的工艺技术近况,指出了未来的发展方向,并重点对湿法和火法工艺未来的发展趋势进行预测。     

红土镍矿选矿工艺与设备的现状及展望

针对红土镍矿的矿石性质与生产现状,对目前红土镍矿的选矿处理工艺与设备进行了综述,重点介绍了针对火法冶炼和湿法冶炼两种冶炼工艺配套的矿石制备工艺和设备,并着重叙述了HPAL项目红土矿选矿工艺的发展过程和现状,最后展望了红土镍矿选矿工艺的发展前景.     

镍资源的利用及镍铁产业的发展

叙述了镍的资源状况和镍矿处理工艺,介绍了我国镍铁产业的现状及发展趋势。     

Reducibility of laterite ores

The reducibility of several types of lateritic nickel bearing ores was investigated. The ores were reduced with hydrogen over a temperature range of 673 to 1273 K and reaction times from 5 to 80 minutes. The fraction of nickel, iron, and cobalt reduced to the metallic state was determined by leaching the reacted samples with a bromine-methanol solution followed by atomic absorption analysis for the individual elements. The reducibility of nickel increased with increasing iron concentration of the ore. Increased reduction temperature greatly raised the amount of nickel reduced for ores with high iron concentrations. The cobalt reducibility decreased with increasing iron concentration of the ore. Changes in reduction temperature affected cobalt reduction less than nickel reduction. The observed changes in reducibility have been attributed to the formation of phases which incorporate nickel and cobalt. The major ore components were plotted on the ternary phase diagram of the SiO₂+(Al₂O₃)-MgO-FeO system. It is shown how this plot can be used to predict the reducibility of different types of lateritic ores. Formerly with the Department of Metallurgy and Materials Science, University of Toronto, Toronto, ON, Canada     

红土镍矿新型烘干设备特点及应用

红土镍矿具有水分高、成分复杂、粘性大易结块成团等特点,烘干一直是技术难题,结合实际使用的红土镍矿烘干设备工艺性能,介绍了新型烘干设备的选型、设备特点,实践证明新型烘干设备技术性能达到了工艺要求,还进行了实际应用技术经济分析,认为红土镍矿采用烘干工艺处理是经济的,结合实际使用情况指出了烘干设备改进的方向。     

Reducibility of laterite ores

The reducibility of several types of lateritic nickel bearing ores was investigated. The ores were reduced with hydrogen over a temperature range of 673 to 1273 K and reaction times from 5 to 80 minutes. The fraction of nickel, iron, and cobalt reduced to the metallic state was determined by leaching the reacted samples with a bromine-methanol solution followed by atomic absorption analysis for the individual elements. The reducibility of nickel increased with increasing iron concentration of the ore. Increased reduction temperature greatly raised the amount of nickel reduced for ores with high iron concentrations. The cobalt reducibility decreased with increasing iron concentration of the ore. Changes in reduction temperature affected cobalt reduction less than nickel reduction. The observed changes in reducibility have been attributed to the formation of phases which incorporate nickel and cobalt. The major ore components were plotted on the ternary phase diagram of the SiO₂+(Al₂O₃)-MgO-FeO system. It is shown how this plot can be used to predict the reducibility of different types of lateritic ores.     

冶炼镍铁的生产实践

论述了利用2万吨镍矿先后分周期冶炼镍铁,在合金成分的控制、渣型的选择、冶炼制度和炉衬的维护上取得了一些经验和教训。根据生产实践总结规律,为镍铁生产提供参考。     

Kinetics of chloridization of nickel-bearing lateritic iron ore by hydrogen chloride gas

The selective chloridization of nickel in a lateritic iron ore by gaseous HCl is based on the principle of relative thermal stability of iron and nickel chlorides. This aspect has been discussed with differential thermal analysis (DTA) and thermogravimetric (TG) data of the hydrated chlorides of iron and nickel. The kinetics of chloridization of nickel in a lateritic nickel ore from Orissa, India, have been studied by using both pure HCl (g) and the HCl (g) + N₂ mixture. The sharp decrease in the rate of chloridization of nickel at temperatures above 250 °C is attributed to the rapid decomposition of molten ferric chloride hydrate (FeCl₃ · 3H₂O), which blocks the pores of the reactant solid. Therefore, kinetics of chloridization follow both the pore-blocking model (logarithmic rate law) and diffusion-controlled mechanisms. Very low values of apparent activation energy and effective diffusivity derived from the rate constants of the diffusion-controlled process suggest that diffusion of HCl (g) takes place either in a dissolved state in the molten ferric chloride (at 100 °C to 150 °C) or through cracks and fissures formed on the surface due to rapid decomposition of ferric chloride at 200 °C to 250 °C. Because of the complexity of the reaction system, the rate of chloridization of nickel is almost independent of grain size.     

红土镍矿冶金综述

随着社会工业的快速发展,镍的消耗不断增加,含镍品位较高的硫化镍矿也日益枯竭,有效开发和利用红土镍矿受到越来越多国家的重视.文章主要分析了红土镍矿资源的矿物特点及其国内外的开发现状,详细介绍世界冶金工业中处理红土镍矿的生产工艺及其优缺点.通过分析红土镍矿提取镍的工艺技术近况,指出了未来的发展方向,并重点对湿法和火法工艺未来的发展趋势进行预测.      

Studies on Processing of Nickeliferrous Sources in India

Nickel requirement in India is met through imports although there are known deposits of nickel laterites. In addition, there are secondary sources such as nickel sulphide in multimetal sulphides associated with uranium ore, low grade nickel bearing lateritic overburden of chromite mining and industrial wastes, such as spent catalyst and grinding waste of alnico. The primary deposits are extensive but the grade is low. All the other sources are small and some of them are quite complex. Recovery of metal values from such sources is important on account of resource conservation. The paper reviews the studies carried out in different laboratories in India.     

大型红土镍矿回转窑窑内温度分析

随着不锈钢和电池行业的快速发展,对镍的需求也不断增加,主要用来生产金属镍和镍铁合金的红土矿将会得到更大程度的开发。回转窑作为红土镍矿工艺流程中关键的设备,规格也在不断的增大,窑内部的反应也原来越复杂,型号的增大、复杂的反应对窑内部的温度有很大的影响,窑内的温度又对大型回转窑设计材质的选取,以及制造方式的选取等方面有决定性的作用。本文通过能量衡算对还原红土镍矿大型回转窑的窑体内部温度进行分析。