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本文通过小体积、大浓度强碱分离和在pH2~3,pH4.5的乙酸-乙酸钠介质中二次络合,解决了分离过程中吸附严重、铝量损失大和络合不完全等问题,方法具有操作简便、快捷,易于掌握和结果准确的特点,适合于铝铁、铝锰中铝的日常分析. 相似文献
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针对电热法生产的一次铝硅合金经稀释精炼后需去除杂质铁,而直接加锰除铁造成了锰的损失,且锰的扩散较慢这一问题。探讨了用氯化锰代替单质锰去除铝硅合金中铁的可能性。结果表明,氯化锰能够与铝反应生成锰即氯化锰可以代替锰去除铝硅合金中的铁。 相似文献
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采用在密闭塑料瓶中硝酸、氢氟酸常温常压分解样品,系统分析了样品中痕量杂质元素V、Ti、Mo、Fe、Sb、Pb、As、Co、Mg、Ca、Mn、Al、Sn、Na、K、Ni、Cr、Cd、Si、Cu、P、Bi的光谱干扰情况及钨酸沉淀分离基体后各元素的回收率情况,最终确立了电感耦合等离子体原子发射光谱(ICP-AES)法测定钨产品中痕量元素的方法。V、Ti由于基本不受基体干扰,钨酸沉淀分离基体后回收率较低,采用在校准曲线中补加基体的方法对其进行测定,其中V的测定下限为5.2μg/g,Ti的测定下限1.3μg/g:Co、Mg、Ca、Mn、Al、Na、K、Ni、Cr、Cd、Si、Cu、Pb、Sn、As、Sb、Bi等元素,受钨基体干扰比较严重,采用钨酸沉淀分离基体后,回收率均在90.0%以上,故采用沉淀分离基体,水标直接测定,各元素的测定下限均在0.10~6.7μg/g之间:而对于受钨基体严重干扰,而且钨酸沉淀分离基体后回收率较低的Fe、Mo、P3元素,目前没有很好的解决方案。此方法为解决钨产品中痕量杂质元素测定提供了一种有效可行的方法。 相似文献
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苏华 《稀有金属与硬质合金》2011,39(2)
研究了用粗氢氧化钴制备锂离子电池用硫酸钴的工艺.采用稀硫酸优溶除杂、还原浸出、氧化沉淀法除铁、锰、砷,氟化沉淀法除钙、镁,P204萃取深度净化除杂;P507萃取除钠及分离镍、钴,制备出适用于生产锂钴氧化合物的电子级硫酸钴. 相似文献
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ABSTRACTMagnetic separation is an effective strategy for the upgrading of a variety of lean ores, including the beneficiation of low-grade manganese ores. This work reviews 24 studies on the magnetic separation of manganese ores; 6 of these studies report both a sufficiently high Mn grade (>44% Mn) and Mn/Fe ratio (>7.5) in the concentrate as to be suitable for use as high-grade feed materials in the production of ferromanganese. Of these 24 studies, the most efficient separation and enrichment was generally achieved by the reduction roasting of the ore prior to magnetic separation, rather than the direct separation of the ore. In both cases there was sufficient evidence for correlation, depending on the mineralogy, between the Mn and Fe grades of the ore and the final concentrate grade and Mn/Fe ratio. To yield a concentrate suitable for use in ferromanganese production, it is recommended that the ore contain a minimum initial concentration of ~25% Mn and ~10% Fe. 相似文献
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用萃取法对氯化烟尘酸浸液中钪的提纯进行了实验研究。萃取体系采用P204+改质剂+磺化煤油。结果表明:钪的萃取率为99.7%,铁、锰的去除率最高分别达到98.1%和99.3%。有机相用NaOH溶液反萃,反萃率可达99.6%,有效地实现了钪与铁、锰杂质的分离。 相似文献
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研究了以氢氧化钠沉淀分离锌和镉的条件 ,用正交设计法选择的最佳条件为 :5 0mL 2 0 0 g/LNaOH作沉淀剂 ;沉淀后 ,溶液煮沸 5min ;2 0g/LNaOH为沉淀洗涤液。分离镉后 ,用EDTA溶液滴定锌。方法准确、重复性好 ,可以代替以KI为掩蔽剂的EDTA滴定法。本法已用于置换渣中锌的测定 ,获得满意的结果。 相似文献
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试样以氢氧化钠溶解,使铝、锌转入溶液并与铜、铁、锰、镁等氢氧化物沉淀分离。将沉淀以酸溶解并调节溶液酸度近中性,用DDTC分离铜、铁、锰,然后在PH10的氨性溶液中。以铬黑T为指示剂,用EDTA标准溶液直接滴定镁,测试铝合金中镁的含量。 相似文献
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The structure and mechanical properties of tempered martensite and lower bainite were investigated in a series of high purity 0.25 pct C steels with varying amounts of nickel and manganese. The martensites in 0.25 C-5 Ni?Fe and 0.25 C-3 Mn?Fe alloys were mainly untwinned, while those in 0.25 C-5 Ni-7 Mn?Fe and 0.25 C-7 Mn?Fe alloys were heavily twinned. Manganese appears to promote carbide precipitation along the lath boundaries in tempered martensite. At equivalent yield and ultimate tensile strength levels, the tempered martensite of lower manganese steels showed better impact toughness than the tempered martensite of higher manganese steels. The impact toughness (compared at similar strength levels) of untwinned tempered martensite of 0.25 pct C steel with Widmanstatten precipitation of carbide was higher than that of lower bainite, which showed unidirectional carbides. The reasons for the difference in impact toughness between the alloys, and also between the structures are rationalized in terms of internal twinning, grain boundary precipitation and carbide morphology together with other microstructural features. 相似文献
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物质研究结果表明,玛瑙山氧化锰矿洗矿泥的性质与原矿相接近。采用筛分—弱磁—强磁选流程,当入选矿泥 Mn14.98%,Fe24.06%时,获得的综合精矿 Mn18.34%,Fe29.75%,Mn Fe=48.09%,其回收率 Mn、Fe 分别为83.04%与83.19%,经造块后可怍为冶炼富锰渣的原料。 相似文献
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CeO2 findswideapplicationsinfuelcells ,andasapromoterinthree waycatalyst(TWC)forautomotiveexhaustcontrol.Thestabilityandoxygenstorageca pacityofCeO2 makeitanidealpromoterinTWCfo rmulations[1,2 ] .Ithasbeenreported[3 ] thatmicrostruc turalstabilityofCeO2 i… 相似文献