氟碳铈精矿空气中焙烧的热分解研究

利用ＤＴＡ、ＴＧ、ＸＲＤ及化学分析等方法对山东微山的氟碳铈精矿在空气中焙烧的反应过程进行了研究。指出氟碳铈精矿的分解过程可分为两步，首先较低温度下，（Ｃｅ，Ｌａ）ＣＯ＿３Ｆ氧化分解为（Ｃｅ，Ｌａ）Ｏ＿（１＋ｘ），Ｆ＿（１－ｘ）；随着焙烧温度的提高，（Ｃｅ，Ｌａ）Ｏ＿（１＋ｘ）Ｆ＿（１－ｘ）继续氧化分解，得到Ｃｅ＿（０．７５）Ｎｄ＿（０．２５）Ｏ＿（１．８７５）和Ｌａ＿２Ｏ＿３等，焙烧过程中部分脱氟，样品总失重率达１９．５４％。     

氟碳铈精矿焙烧反应的研究

本文利用ＸＲＤ、ＤＴＡ－ＴＧ及化学分析等方法，对氟碳铈矿的焙烧反应进行了研究。指出氟碳铈精矿在７５０℃下，焙烧５ｈ，分解反应分为两步进行，首先ＲＥＣＯ３Ｆ（本文中ＲＥ代表Ｃｅ、Ｌａ、Ｎｄ、Ｐｒ）分解为ＲＥＯＦ，然后ＲＥＯＦ继续氧化分解得到：Ｃｅ０．７５Ｎｄ０．２５Ｏ１．８７５、ＰｒＯ１．８３、ＬａＦ３等，在焙烧过程中发生部分脱氟，同时铈和镨被部分氧化为四价。同时对焙烧反应动力学进行了计算，得出：反应表观活化能Ｅ＝２２９．７ｋＪ／ｍｏｌ，反应级数ｎ＝０．９５。     

在氟盐体系中镧离子阴极过程的研究

采用循环伏安法研究了ＬａＦ＿３－ＬｉＦ二元熔体及添加Ｌａ＿２（ＣＯ＿３）＿３的ＬａＦ＿３～ＬｉＦ熔体中，９２０～９５０℃下，Ｌａ￣（３＋）在石墨电极上还原的阴极过程。结果表明：在ＬａＦ＿３－ＬｉＦ熔体中，电位在－０．８５Ｖ左右（相对于石墨参比电极），Ｌａ￣（３－）离子在阴极还原析出；在添加Ｌａ＿２（ＣＯ＿３）＿３，的ＬａＦ＿３－ＬｉＦ三元熔体中，Ｌａ（ＣＯ＿３）＿３，分解为Ｌａ＿２Ｏ＿３，Ｌａ＿２Ｏ＿３首先电解，然后ＬａＦ＿３电解，均在阴极上析出镧。镧离子的电化学反应是简单的一步反应，即Ｌａ￣（３＋）＋３ｅ→Ｌａ。     

CaO－MgO_（sat）－FeO_n－SiO_2渣系与铁液间磷平衡分配比的极

按文献［１～４］，Ｌ＿ｐ与（ＦｅＯ＿ｎ）和Ｒ之间均有极值关系存在。本文得出从不同侧面反映的Ｌ＿ｐ极值关系式和曲线：（１）按ＣａＯ／ＳｉＯ＿２＝０～０．９，０．９１～１．９和＞１．９三个区段划分的，用１／Ｔ、ｌｇ｛（ＣａＯ）＋０．７（ｍｇＯ）｝、ｌｇ（ＴＦｅ）和ｌｇ（Ｐ＿２Ｏ＿５）表述的一次多项式；（２）按ＣａＯ／ＳｉＯ＿２＝０～０．０９，０．１～０．９，０．９１～１．４，１．４１～１．９和＞１．９五个区段划分的，用１／Ｔ，（∑ＦｅＯ）、（∑ＦｅＯ）￣２和ｌｇ（１＋ＳｉＯ＿２）表述的非齐次多项式；（３）按∑ＦｅＯ＝１３％～１５％，１６％～２０％和３０％～３５％三个区段描述的Ｌ＿ｐ－Ｒ极值曲线。并发现Ｌ＿ｐ与（∑ＦｅＯ）和Ｒ之间的极值关系存在一定规律。     

溶胶－凝胶法制备La_2Zr_2O_n超微粉末

用溶胶－凝胶法合成了Ｌａ２Ｚｒ２Ｏｎ超微粉末。ＳＥＭ分析表明，Ｌａ２Ｚｒ２Ｏｎ粒子呈球形，平均粒径小于０．５μｍ。Ｘ射线衍射分析表明，在Ｌａ２Ｚｒ２Ｏｎ形成过程中未发现有中间相的存在；焙烧温度８００～９００℃时为荧石结构，１０００℃时为烧绿石结构，属于立方晶系，空间群为Ｆｄ３ｍ（２２７）。晶粒大小计算表明，平均晶粒度随焙烧温度的升高而增大，晶格畸变率则随粒径的增大而变小，红外光谱分析表明，粒子越小，表面活性越高。     

降低Nd_2O_3中杂质Sm_2O_3的工艺研究

在工业生产实践中，对Ｎｄ－Ｓｍ分组采用大捞大洗和加氨水强化萃取分离的工艺方法实现了一步萃取法除去Ｌａ３＋Ｃｅ３＋Ｐｒ３＋Ｎｄ３＋萃余液中Ｓｍ３＋的目的，经六个月运行，产品Ｎｄ２Ｏ３中杂质Ｓｍ２Ｏ３含量稳定在０．０３％以下。     

铁水预处理脱硅对脱磷影响的实验研究

在实验条件下,利用Ｆｅ３Ｏ３－ＣａＯ－ＣａＦ２渣系研究了在高炉铁水预处理过程中脱硅对脱磷的影响。结果表明,在１６２３Ｋ温度下,脱硅渣中ｗ（Ｆｅ２）３）＝１６．８％～４０％进可获得终点ｗ（Ｓｉ）含量为０．１４４％～０．０９０％的脱硅效果;对初始「Ｓｉ」含量小于０．１５％的铁水,在１５７３Ｋ温度下,脱磷渣中ｗ（Ｆｅ２Ｏ３）＝４０％即可获得８５％以上的脱磷率,而在１６２３Ｋ温度下,脱磷渣中ｗ（Ｆｅ２Ｏ３     

混合碳酸稀土热分解过程的研究

用ＤＴＡ热分析技术研究混合碳酸稀土焙烧过程中的脱水过程,分解过程,用Ｆｒｅｅｍａｎ－Ｃａｒｒｏｌｌ法、Ｐｉｌｏｙａｎ法和Ｋｉｓｓｉｎｇｅｒ法对其脱水及热分解的动力学参数进行计算,并对计算的结果进行比较和验证,得到了混合碳稀土脱水过程的反应活化能和反应级数分别为８０６．９Ｊ／ｍｏｌ、０．７８,热分解过程的反应活化能和反应级数分别为８．５２９ｋＪ／ｍｏｌ、０．９５。用ＸＲＤ分析方法研究了不同焙烧温度对焙烧产物的影响,论证高温下焙烧可能产生Ｃｅ０．７５Ｎｄ０．２５Ｏ１．８７５相。     

西南稀土矿的矿石性质及分选工艺研究

研究了西南稀土矿的矿石性质及分选工艺．原矿风化强烈，产生大约２０％的黑色风化物矿泥。－矿石中可工业利用的稀土赋存形式有矿物相和胶态相。矿物相稀土以氟碳铈矿为主，占９６％以上，重选或重浮选联合工艺可得到ＲＥＯ３０％，５０％和６０％的氟碳铈矿精矿，稀土回收率６５％。胶态相稀土则吸附在Ｆｅ－Ｍｎ非晶质氧化物矿物上，用热盐酸浸出，氨水除杂，草酸沉淀回收稀土，稀土回收率７４．３％，并副产铅。矿石和黑色风化物中稀土都强烈选择铈族稀土，∑ＣｅＯ２在９０％以上，且ＣｅＯ２＞Ｌａ２Ｏ３＞Ｎｄ２Ｏ３。     

ICP—AES法测定锌合金中的稀土杂质

研究了用ＩＣＰ－ＡＥＳ法测定锌合金中６种稀土元素（Ｌａ２Ｏ３，ＣｅＯ２，Ｐｒ６Ｏ１１，Ｎｄ２Ｏ３，Ｓｍ２Ｏ３，Ｙ２Ｏ３）的方法，采用正交设计实验对工作参数进行最佳化选择、基体匹配的方法消除基体影响，利用两点定标校正曲线法计算测量结果。在最佳实验条件下，本法测定杂质元素检出限０．１￣０．８μｇ／ｇ，相对标准偏差２．６％￣５．６％，回收率９１．６％￣１０６．３％。方法简便、快速，可以满足科研生产的需要     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.