铬精矿、铬铁矿及高碳铬铁中氧化锰、氧化铬的连续测定

铬精矿及铬铁矿在钢铁工业中主要作为冶炼铬铁和制造耐火砖的材料,其中ＭｎＯ和Ｃｒ_２Ｏ_３是必不可少的分析项目。本文提出了连续测定ＭｎＯ及Ｃｒ_２Ｏ_３含量的方法,以瓷坩埚代替镍坩埚,采用Ｎａ_２Ｏ_２熔融试样,直接氧化了Ｍｎ（Ⅱ）与Ｃｒ（Ⅲ）,同时分离出锰,在一定的酸度范围内测定ＭｎＯ的含量,调整滤液酸度,测定Ｃｒ_２Ｏ_３的含量。１实验部分１．１主要试剂Ｎａ_２Ｏ_２（固体）;无水Ｎａ_２ＣＯ_３（固体）;Ｎａ_２ＣＯ_３洗液：２％水溶液;硫磷混酸：１６０ｍＬ浓Ｈ_２ＳＯ_４及８０ｍＬ浓Ｈ_３ＰＯ_４小心缓慢加入…     

MnO2·xH2O共沉淀分离5—Br—PADAP—OP水相光度法测定Cu部的Sb

基于ＨＮＯ２介质中ＭｎＯ２·ｘＨ２Ｏ能分离富集锑继而利用Ｓｂ（Ⅲ）与ＫＩ的铬阴离子［ＳｂＩ４］＾－在１．１￣１．８ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中与偶氮类显色剂５－Ｂｒ－ＰＡＤＡＰ形成的离子缔合物，在乳化剂ＯＰ存在下，有较高灵敏度与选择性，可不经萃取分离水相光度法测定Ｃｕ中锑。线性范围０￣４０μｇ／２５ｍＬ，ε６１０＝４．３×１０＾４。     

铬铁矿的快速溶解方法及用分光光度法测定铬

Ｃｒ２Ｏ３和铬铁矿能溶于Ｈ２ＳＯ４－Ｌｉ２ＳＯ４Ｃｅ（ＳＯ４）２（２０／１０／１Ｖ／Ｗ／Ｖ），Ｈ２ＳＯ４－Ｌｉ２ＳＯ４－ＭｎＯ２（２０／１０／１Ｖ／Ｗ／Ｗ）或Ｈ２ＳＯ４－Ｌｉ２ＳＯ４－ＫＩＯ４（２０／１０／２／Ｖ／Ｗ／Ｗ）中，生成的混浊溶解可用Ｈ２Ｏ２处理或溶剂萃取使之变得清亮，而后用分光光度法在６１４ｎｍ处测定铬。     

混合微乳液的增敏作用研究——5-溴吡啶偶氮二乙氨基苯酚分光光度法测定锰(Ⅱ)

研究了在Ｏ／Ｗ混合微乳液ＳＤＳ－ＯＰ／ｎ－Ｃ４Ｈ９ＯＨ／ｎ－Ｃ７Ｈ１６／Ｈ２Ｏ介质中,Ｍｎ（Ⅱ）与５－溴吡啶偶氮二乙氨基苯酚（５－Ｂｒ－ＰＡＤＡＰ）的显色反应。结果表明,在此介质中,显色反应的ε５７０＝１．２６×１０５,较之在单一ＳＤＳ微乳液、ＯＰ微乳液或混合ＳＤＳ－ＯＰ胶束介质中,具有更大的增敏作用和稳定性,ＭｎⅡ在０～８μｇ／１０ｍｌ范围内具有良好的线性关系。方法用于硅铁、硅砖等试样中锰的测定,结果满意。     

钼(Ⅵ)、钨(Ⅵ)-溴代苯羟乙酸络合吸附电流在催化体系中的增敏研究和应用 Ⅰ.同时测定钼、钨的灵敏示波极谱法

在含ＥＤＴＡ、溴代苯羟乙酸（Ｂｒ－ＢＨＡ）的硫－磷混酸介质中,钼（Ⅵ）、钨（Ⅵ）－Ｂｒ－ＢＨＡ络合物分别在- ０.５０Ｖ和-０．８７Ｖ（ｖｓ．ＳＣＥ）处产生不太灵敏的极谱电流。加入ＮａＣｌ_３后,产生灵敏催化电流［比在苯羟乙酸（ＢＨＡ）体系分别增敏２．３倍和３倍］,峰电位（Ｅｐ）分别移至－０.４４Ｖ和－０.７８Ｖ。系统研究了十余种易质子化有机染料和八种阳离子表面活性剂对上述催化电流进一步增敏效应,其中以亚甲蓝（ＭＢ）为最佳。无ＮａＣｌＯ_３时,加入 ＭＢ,原络合电流略有所降低, Ｅｐ无明显变化。但当加入     

钼（Ⅵ）.钨（Ⅵ）—溴代苯羟乙酸络合吸附电流在催化体系中的增敏研究和应用

在含ＥＤＴＡ、溴代本羟乙酸（Ｂｒ－ＢＨＡ）的硫－磷混酸介质中,钼（Ⅵ）、钨（Ⅵ）－Ｂｒ－ＨＢＡ络合物分别在－０．５０Ｖ和０．８７Ｖ（ｖｓ．ＳＣＥ）处产生不太灵敏的极谱电流。加入ＮａＣｌＯ３后,产生灵敏催化电流「比在苯羟乙酸（ＨＢＡ）体系分别增敏２．３倍和３倍１．峰电位（Ｅｐ）分别移至０．４４Ｖ和－０．７８Ｖ。系统研究了十余种易质子化有机染料和八种阳离子表面活性剂对上述催化电流进一步增敏效应。其中以     

海洋锰结核的试验研究：Ni（Ⅱ）在H2O—NH3—SO2—MnO2体系中的行为

在用亚硫酸铵（ＮＨ４）２ＳＯ３浸出海洋锰结核中有价金属时发现镍从浸出液中损失，本试验就是研究这种损失的原因，在下列体系中，对Ｎｉ（Ⅱ）的行为进行研究：ａ．ＮＨ３－（ＮＨ４）２ＳＯ３－Ｈ２Ｏ；ｂ．ＮＨ３－用氧部分氧化的（ＮＨ４）２ＳＯ３－Ｈ２Ｏ；ｃ．ＮＨ３－用ＭｎＯ２部分氧化的（ＮＨ４）２ＳＯ３－Ｈ２Ｏ，在ＮＨ３－（ＮＨ４）２ＳＯ３溶液用ＭｎＯ２氧化时，加入的Ｎｉ（Ⅱ）形成晶状沉淀：Ｎｉ０．７５Ｍｎ     

英国基准Fe_2O_3和国产基准Fe_2O_3的对比试验

英国基准Ｆｅ２Ｏ３和国产基准Ｆｅ２Ｏ３的对比试验①昆明冶金研究院②王建琴采用硫磷混酸溶样，ＳｎＣｌ２－ＨｇＣｌ２－Ｋ２Ｃｒ２Ｏ７〔或Ｃｅ（ＳＯ４）２〕体系滴定法测定铁，由于有很高的准确度，至今仍是测定高含量铁的主要方法之一。经验表明，用基准的Ｋ２Ｃｒ...     

冕宁稀土矿泥中锰与稀土分离及回收的研究

以Ｎａ２ＳＯ３为还原剂,采用还原浸出法处理四川冕宁稀土矿泥,实现了矿泥中锰和稀土的分离,提高了矿泥氯化焙烧时稀土的氯化率。对锰浸出液,用ＫＭｎＯ４氧化,水解聚合法去除杂质铁,生成ＲＥ（ＯＨ）３法回收稀土,制备出合格的产品ＭｎＣＯ３,并讨论了有关工艺原理与条件。     

阳离子型微乳液介质中铜（Ⅱ）－苯基荧光酮的增敏试验

研究了在阳离子型微乳液介质中,用苯基荧光酮测定铜（Ⅱ）的分光光度试验。结果表明,以阳离子型ＣＴＭＡＢ－ｎ－Ｃ＿５Ｈ＿（１１）ＯＨ－ｎ－Ｃ＿７Ｈ＿１６－Ｈ＿２Ｏ微乳液为介质,Ｃｕ（Ⅱ）－ＰＦ的ε＿（５７２）＝１．３７×１０￣５,与以水为介质ε＿（５４０）＝４．３×１０￣４及相同含量ＣＴＭＡＢ胶束溶液为介质ε＿（５７２）＝８．９×１０￣４比较,测定灵敏度显著提高,并且某些实验条件更加宽容。经投入使用,结果满意。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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