共查询到20条相似文献,搜索用时 870 毫秒
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《有色金属科学与工程》2010,(Z1)
通过对无水、干法和湿法氟化铝的生产工艺和产品质量比较分析,以及其在电解铝使用过程中的物料和能源消耗、污染排放、产品质量方面的影响对比,阐明了无水氟化铝有利于电解铝的节能、减排、降耗和质量控制,是新一代高性能的铝用氟化盐产品,代表了今后全球铝用氟化盐产品的趋势和发展方向. 相似文献
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工业上制造铝始于1850年,用钠在高温下还原氯化铝。尔后,用电解熔融铝的氯化物和氟化物来制造铝,但铝的产量低且成本太高。到1886年,霍尔和赫劳特二人同时发明了电解熔融的冰晶石———氟化铝的方法,这种方法是现代制铝工业的基础。电解铝经历了100多年的... 相似文献
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随着国家要求对电解铝液产业链的延伸,使用电解铝液生产普通产品,甚至双零铝箔、航空航天用铝高端产品是必然趋势。电解铝液中含氢、含碱金属量高,从目前生产状况看,只靠炉外精炼很难达到产品质量要求。本文重点介绍几种炉内精炼技术和工艺装备。 相似文献
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胡忠 《金属材料与冶金工程》1984,(6)
湘乡铝厂始建于一儿五八年,是以生产氟化盐产品为主的重点企业,现有职工二千余人,年产氟化盐三万吨,是目前国内最大的氟化盐生产厂。此外,还生产电解铝、无水氟化氢、硫酸钒、干石膏、铝焊粉、锂盐等产品。该厂座落在湘乡县城郊,厂内有铁路专用线与湘黔铁路相连,公路与长邵公路干线 相似文献
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粉煤灰氯化法生产无水氯化铝、无水氯化铝电解得到金属铝是一条新的研究思路,其中粉煤灰氯化法生产无水氯化铝是关键。在参考海绵钛生产工艺的基础上,提出了一个高铝粉煤灰直接氯化法生产无水氯化铝的新工艺,并对粉煤灰氯化、无水氯化铝精制等关键技术进行了详细的分析。 相似文献
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Zhimin Zhang Xuchen Lu Feng Pan Yun Wang Suping Yang 《Metallurgical and Materials Transactions B》2013,44(2):354-358
A method was proposed for the preparation of high-purity anhydrous magnesium chloride by using magnesium chloride hexahydrate and ammonium chloride as raw materials, and alumina as covering agent. X-ray diffraction was employed to investigate the process. The mechanism involved in the process was proposed. The factors affecting the purity of anhydrous magnesium chloride were investigated. Dehydrated ammonium carnallite was formed in the process to facilitate the dehydration process. Alumina as covering agent can guarantee that the formation of high-purity anhydrous magnesium chloride was obtained. The content of magnesia in anhydrous magnesium chloride was 0.02 pct under the optimum conditions: molar ratio of ammonium chloride to dehydrated magnesium chloride was 2:1, thickness of alumina 1.3 cm, reaction temperature 723 K (450 °C), reaction time 1 hour, and the number of crystallized water 0.6 to 2.2. 相似文献
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《Journal of Light Metals》2001,1(2):111-117
The electrolytic production of magnesium requires high-purity, anhydrous magnesium chloride which has a high affinity for water and is found in nature as a plurality of hydrates (MgCl2·nH2O, n=1, 2, 4, 6, 8, 12). Their dehydration is nontrivial and can be accompanied by hydrolysis leading to the production of undesirable oxycompounds of magnesium. Through an analysis of the relevant thermochemistry this paper indicates how to prevent hydrolysis and make electrolytic-grade, anhydrous MgCl2. 相似文献
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种分过程存在产品周期性细化的现象,为了缓和种分氢氧化铝粒度波动,将种分氢氧化铝加入碳分流程。通过各种试验证明,碳分流程可以很好地消化种分细料,从而控制产品氢氧化铝中的极细颗粒。 相似文献
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利用煤系高岭土电热法生产铝硅合金的节能研究 总被引:2,自引:0,他引:2
利用煤系高岭土、烟煤和黏结剂经球团处理后,在大型矿热炉中直接电热还原生产高硅铝硅合金,进而用纯铝稀释成各种牌号的铸造、压铸铝硅合金,是目前唯一区别于利用电解铝、金属硅掺兑生产铝硅合金的工业化技术。同时从节能方面阐述了电热一步法直接从矿石中获取有用金属的优势。 相似文献
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The equilibrium constants for the extraction of lithium chloride, magnesium chloride and aluminium chloride by 1-hexanol and isopentyl alcohol were determined. For the joint distribution of the three salts between aqueous and organic solutions, a computer calculation based on a thermodynamic multicomponent electrolyte solution approach was applied. The coextraction of water was also taken into account. Predictions for the selective extraction of lithium were tested against experimental data, and reasonable agreement was found at low concentrations. The discrepancies observed at high chloride concentrations were ascribed to ion-pairing in the organic phase and to water co-extraction, possibly also to cation—cation interactions on the organicphase. 相似文献
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利用盐湖氯化镁和硫酸制备七水硫酸镁,将七水硫酸镁脱水得到无水硫酸镁.采用天然气还原热解无水硫酸镁得到高纯氧化镁.通过单因素实验考察了还原热解温度、热解时间、硫酸镁的粒径和天然气气体流量对硫酸镁转化率的影响,通过正交试验优化了还原热解的条件.采用X射线衍射和扫描电镜对还原热解产物进行分析和表征.氧化镁的最佳制备条件:热解温度为1000℃,热解时间为30min,硫酸镁粒径为75μm,天然气气体流量为25mL·min-1.温度是影响硫酸镁转化率的主要因素.在最佳制备条件下,硫酸镁的转化率达到99.27%,氧化镁的纯度达到99.5%,制取的氧化镁单分子均匀,表面为多孔蓬松,具有高比表面积. 相似文献