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几种矿物的超细加工及对建材防氡防辐射性能的影响 总被引：3，自引：0，他引：3
采用湿法搅拌磨和气流磨,对用作防氡防辐射基元材料原料的重晶石、沸石进行超细加工和激光粒度分布测试,结果表明：重晶石、沸石通过湿法和干法粉磨加工,在一定的时间内都可以超细粉碎到d90小于10μm,从粉磨时间以及粉磨成本来比较干磨法要明显优于湿磨法;重晶石进行超细加工后所制备的水泥砂浆的外照射指数从0．51降到0．23,重晶石所配腻子的氡和放射性屏蔽率提高20％～30％。当沸石的粒度减小时,水泥砂浆对氡的屏蔽率提高的屏蔽率最大达26％。沸石从119μm降到18μm时,腻子的防氡率从37．9％提高到53．1％。防辐射性能从整体上来看是粒度越细性能越好。 相似文献
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以钠基膨润土为原料制备了镍钛无机交联、有机交联系列改性膨润土，比较了二者对废水中化学需氧量（COD）、Cr（Ⅵ）、色度、浊度的去除效果，探讨了改性膨润土用量、pH值、搅拌时间等因素对实验的影响。结果表明：镍钛有机交联膨润土对COD和Cr（Ⅵ）的处理效果明显优于镍钛无机交联膨润土；二者对浊度和色度处理效果相当。其吸附行为符合Langmuir方程。 相似文献
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由于环境,资源方面的问题,湿法冶金已成为目前冶金工业的主要发展方向之一。着重讨论了铜,镍的湿法冶炼技术,并介绍了金,银等金属的湿法冶炼,以及湿法冶金的进展。 相似文献
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为减小孕镶金刚石切削工具的烧结温度对单晶金刚石性能的影响和改善切削工具胎体性能,降低烧结温度和优选胎体配方材料是很好的解决方法。在切削工具的胎体中加入适量纳米镍粉,通过对制备试样的硬度、强度和耐磨性测试及微观特征分析,综合评价该方法的可行性。结果表明：对于WC基胎体,含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高11.9%,抗弯强度提高18.4%,耐磨性提高44.5%;对于Fe基胎体,含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高19.5%,抗弯强度提高0.2%,耐磨性提高33.3%。既减小了温度对金刚石的影响,又提高了切削工具整体性能。 相似文献
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以水镁石为原料,与盐酸反应制得氯化镁,然后将氯化镁和氨水碱溶液在室温下反应得到氢氧化镁,再通过水热处理制备出了超细、高纯的氢氧化镁颗粒,通过利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对所制得氢氧化镁颗粒的晶相、形貌和颗粒尺寸进行了表征。实验结果表明水热处理温度、填充度和搅拌速度对氢氧化镁晶体的晶相和颗粒尺寸有显著的影响,升高温度有助于改善颗粒的晶形和分散性、并减小颗粒的尺寸,较高的填充度有利于六方片状颗粒的生成,当填充度为40%,搅拌速度为400 r/min,水热处理温度为150℃时,制备出了半径约100~250 nm,厚度为10~100 nm,晶形完整,分散性好、大小均一的六方片状超细、高纯的氢氧化镁颗粒。 相似文献
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异形矿物的超细效应研究董发勤万朴彭同江宋功宝＊＊（西南工学院矿物材料及应用研究所，四川绵阳６２１００２）关键词异形矿物超细效应粉体性能用机械法制备超细矿物粉体的技术已经成熟，但对其细度变化所引发的一系列表面性质、表面结构、表面能及形态、颗粒力学的诸多... 相似文献
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有关毛发中微量元素的测定，已有很多报道^[1]，但就其洗涤和前处理的方法问题，怎样更合理，更符合快速准确的分析原则，我们认为有必要进一步探讨。本文就我中心在1990年元月初前所用湿法和改进后的干法简述加以比较。 相似文献
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近年来人们发现硫化亚铁清除含镍工业废水效果很好，而煤系中硫铁矿资源丰富，价格低廉，可为含镍工业废水治理开辟新途径。以煤系中硫铁矿和还原铁粉为原料，制备含镍废水净化剂——硫化亚铁，当原料的比例为100：10，加热温度为200℃，加热时间为10min时对工业废水中的镍去除率较高。 相似文献
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不锈钢产业是镍最大的消费领域,对全球镍消费趋势起决定性作用.近年来,电动汽车产业逐渐发展,动力电池对镍需求也逐渐得到重视,该领域的镍消费普遍被认为是最具发展潜力的镍消费领域.本文通过对镍需求的历史和现状进行分析,对未来不锈钢及电动汽车领域等重要部门的镍需求进行了展望,认为未来镍需求将由2019年243万t增长至2030年445万t,其中不锈钢领域仍为其第一大消费领域,电池领域上升为第二大消费领域;通过梳理全球镍资源情况及供应开发情况,认为由于受到疫情冲击,2020年镍矿供需形势紧张状态将有所缓解,但随着未来疫情好转,未来几年内镍仍将处于供需紧张状态;此外,通过梳理镍供应链条,本文认为市场对硫酸镍以及硫化镍矿需求未来有望持续增长,这对镍盐价格将形成有力支撑,对推动全球红土镍矿湿法产能建设也将形成一定促进作用. 相似文献
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大洋多金属结核和深海沉积物标准物质中铂族元素的中子活化分析 总被引：7，自引：2，他引：5
采用镍锍试金预富集中子活化分析方法,测定了大洋多金属结核标准物质ＧＳＰＮ２、ＧＳＰＮ３和深海沉积物标准物质ＧＳＭＳ２、ＧＳＭＳ３中的铂族元素;根据大洋样品成分特征,对常规的镍锍试金配方和熔炼条件作了改善;计算了活化分析中的铂族元素干扰核反应,校正了Ａｕ对Ｐｔ的二级干扰;选用羰基化镍粉配料,降低了铂族元素空白值。用国家一级标准物质ＧＢＷ０７１０２作了对照分析,结果与标准值相符。 相似文献
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试样经烘干处理后,利用酸溶法或碱融法制备稳定的分析溶液,然后利用原子吸收分光光度计于波长232．0nm处,随同标准曲线测量镍含量,此方法简单、快捷,所选分析线干扰小、灵敏度高,稳定性和准确度均满足要求。 相似文献
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D. R. de Vletter 《Mathematical Geology》1978,10(5):533-542
Although two-thirds of the present nickel production is derived from nickel sulfides, lateritic nickel reserves are estimated
to be around three times as large as those of sulfides. This discrepancy is largely caused by the mineralogical complexity
of lateritic nickel which precludes low-cost beneficiation by conventional physical methods. Nevertheless, lateritic nickel
reserves are bound to become increasingly important because of expected metallurgical advances. Lateritic nickel deposits
were formed from peridotitic rocks on peneplaned surfaces during a tropical or subtropical climate. The most important deposits
were formed during the Tertiary and the lateritization process still continues in deposits situated in the present tropical
or subtropical belts. Other deposits, like those in East Europe and Greece, were formed during much older periods (Palaeogene-Cretaceous).
The various types of lateritic nickel deposits, covered or uncovered,in situ or transported, are listed and their characteristics briefly mentioned. Large differences exist in depth, grade, specific
gravity, and mineralogical composition—the latter especially in the nickel silicate section as opposed to the overlying limonitic
section. These large differences exist even within one individual mining area. Because of the mineralogical complexities and
highly irregular boundaries of lateritic nickel deposits (especially the upper and lower boundaries of the nickel silicate
section), thorough studies are required to determine the mineralogical composition and ratios of the components. Only then
may it be possible to specify with confidence the most suitable metallurgical process which has a strong bearing on the cost
and consequently the viability of the deposit. This condition makes the exploitability rating in the McKelvey classification
diagram relatively more difficult. Because of the quickly changing geological attributes of deposits even within limited areas,
it seems necessary to develop various deposit models for many, if not most, individual metallogenic regions. It does not seens
justified or practical to use estimation methodologies based on straight extrapolation. This is especially the case when dealing
with the young uncovered type of deposit which constitutes the bulk of global resources. Consequently methodologies no. I
(areal value estimation. Cargill, Meyer, Picklyk, Urquidi, 1977) and no. 2 (volumetric estimation) are not considered suitable.
It is thought that methodology no. 3 (abundance estimation) in conjunction with no. 5 (Delphi estimation) would work satisfactorily
but, as could be expected, the most meaningful results should come from a combination of methodologies nos. 4 (deposit modeling),
5 (Delphi estimation), and 6 (integrated synthesis). A classification of leteritic nickel deposit types is proposed.
This paper was presented at the International Geological Conclation Program (IGCP) Project 98: “Standards for Computer Applications
in Resource Studies” held at Taita Hills, Kenya, November 8–15, 1977. 相似文献
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过硫酸铵-丁二酮肟光度法测定红土镍矿中的镍 总被引：2，自引：1，他引：1
红土镍矿样品用适宜比例的HCl-HNO3-HF-HClO4混合酸低温消解,待样品溶解完全后在NaOH介质中,以过硫酸铵作氧化剂将Ni2+氧化为Ni4+,使Ni4+与丁二酮肟生成可溶性酒红色络合物,采用分光光度法测定镍的含量。样品溶液中仅通过加入酒石酸钾钠作掩蔽剂,就可消除红土镍矿中其他基体元素对镍测定的干扰,避免了萃取分离操作和有机试剂对环境的污染。在优化的酸碱度、试剂加入顺序及用量、显色时间等实验条件下,镍的线性范围为0～2.0μg/mL,方法检出限为0.1 mg/g,精密度为(RSD)为0.75%～1.69%,加标回收率为95.4%～102.7%。方法用于分析红土镍矿中镍的含量,测定结果与电感耦合等离子体发射光谱法相符。该方法简便,稳定性好,仪器价格低廉,可用于批量红土镍矿样品中镍的快速准确测定。 相似文献
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Nicolas Perrier Fabrice Colin Tanguy Jaffré Jean-Paul Ambrosi Jérôme Rose Jean-Yves Bottero 《Comptes Rendus Geoscience》2004,336(6):567-577
Nickel speciation in a nickel hyperaccumulating plant (Sebertia acuminata) and its associated soil of southern New Caledonia was studied using various analytical methods. The soil is formed of iron oxides (goethite, hematite), which contain almost all the nickel. The available nickel is probably linked to the organic matter in the litter. Sebertia acuminata, acts as a nickel pump, and concentrates the metal in its leaves. It partitions nickel and silica; nickel is concentrated in the cells (probably in the vacuoles) as organometallic complexes, whereas silica forms the framework of the cells, and the phytolithes. A thorough study of these plants seems essential in order to define the soil–plant relations, and to propose appropriate ways for ecological restoration. To cite this article: N. Perrier et al., C. R. Geoscience 336 (2004). 相似文献