氧化钼直接合金化炼钢的发展

 介绍了氧化钼直接合金化炼钢的理论依据和电炉炼钢过程中的最佳加入时期,总结了抑制氧化钼挥发的研究成果并对比分析了国内外氧化钼炼钢工艺流程的差别。由此得出,采用氧化钙、碳酸钙、氧化镁或氧化铁和三氧化钼混加的方式能显著抑制三氧化钼的挥发,提高钼的收得率。     

钼添加剂及其生产工艺

在控制条件下由辉钼精矿焙烧混合氧化钼的生产工艺。生产的这种混合氧化钼,其氧含量介于以化学配比计算出的二氧化钼和三氧化钼的氧含量之间,三氧化钼含量相当于5～15%,如过程控制得好,三氧化钼含量可达到10～15%。这种混合氧化钼可作为钼的添加剂加入到钢水中和其它类似的物料中。与使用三氧化钼相比,添加这种产品钼的利用率高,添加特性也好。焙烧这种产品建议使用窄轴式多膛焙烧炉。这种炉子生产的产品,与生产三氧化钼相比,大小相同的炉子也可大大提高生产率,同时,排出气体中二氧化硫的浓度也较高。     

钼冶金学技术发展现状与展望

评述了近年来钼冶金学技术发展,主要有利用流态化焙烧炉、2段流态化焙烧炉和微波炉氧化焙烧钼精矿生产工业氧化钼;用MAP从低品位钼精矿生产工业氧化钼或化学级三氧化钼;升华法生产高纯三氧化钼;将钼粉转化成钼酸溶液,采用阳离子交换树脂除杂,干燥,用氢还原制取出低U、Th的高纯钼粉。     

应用氧化钼进行合金化的理论基础和实践

本文探讨的氧化钼代替铁合金化的理论,并经过实践认为三氧化钼比二氧化钼收得率高,比钼铁提高约8％,每吨氧化钼可使企业获2792元效益。     

三氧化钼低温挥发性能及抑制挥发方法

 选取碳酸钙、氧化钙及氧化镁作为添加剂，采用热重分析法及X射线衍射(XRD)分析对比了各添加剂对三氧化钼挥发的抑制效果。研究结果表明，碳酸钙和三氧化钼500℃开始反应，至三氧化钼开始挥发前二者反应已基本完成，且反应速率大于三氧化钼的挥发速率；碳酸钙、氧化钙和氧化镁均能有效抑制三氧化钼的挥发，500~700℃温度区间抑制效果较好，其中碳酸钙对氧化钼挥发的抑制效果优于氧化钙及氧化镁。     

钼冶金技术发展近况

评介了钼冶金产品生产技术的最近进展,如钼精矿转化工业氧化钼、钼精矿氧压煮生产化学纯三氧化钼、用氧化剂和浸出剂同时处理钼精矿生产化学纯三氧化钼,从钼精矿直接制取钼铁,用双十三胺萃取钼酸盐,反萃工艺生产二钼酸铵和钼粉、钼造粒粉等。     

工业三氧化钼对钼酸铵生产及回收率的影响

本文通过对钼酸铵生产的原料工业三氧化钼进行技术分析,以及开展相关试验,验证工业氧化钼对钼酸铵工艺以及整个钼产业链回收率的影响。     

仲钼酸铵热分解过程及其形貌演变的研究

通过TG-DSC和SEM对仲钼酸铵在空气中热分解过程进行分析,结果表明:仲钼酸铵在空气中的热分解过程经历了3个阶段:室温至222.6℃之间仲钼酸铵失去结晶水;从222.6～240.7℃之间仲钼酸铵热分解了部分氨根离子;从240.7～248.7℃之间氨根离子完全分解,同时有亚稳态的氧化钼生成.从248.7～322.5℃之间亚稳态的氧化钼发生相变生成了稳态的三氧化钼.与此同时,仲钼酸铵在热分解温度300℃以下时,其热分解产物的形貌几乎没有太大的变化;在300℃以上时,其热分解产物的形貌由原来不规则的块体向不规则的片状转变,最后转变为了较规则的片状三氧化钼.这主要是由于随着热分解温度的进一步升高,热分解产物之间的相互作用、迁移和重组加剧,以及在高温下三氧化钼的挥发与沉积所致.     

钼铁、氧化钼的合理比价与能源节约

<正> 钼及其化合物在工农业生产、科学技术、航空和宇宙航行等方面具有重要的用途。钼是重要的合金元素,是电子工业的重要材料。钼的合金——钼铁80％以上用于钢铁工业,是生产合金钢的重要添加剂。氧化钼是钼精矿经过氧化焙烧除硫后的产品,其主要成分是三氧化钼。用氧化钼炼钢是当今钢铁工业的一项新技术。氧化钼代替钼铁直接炼钢最大的优越性是减少能源消耗,降低炼钢成本,提高经济效益。     

POX和NSC研究进展

POX氧压氧化辉钼矿精矿工艺可用于生产工业氧化钼;从低品位钼精矿生产纯三氧化钼;生产高溶性氧化钼;钼精矿除铜和从废催化剂中回收钼和镍等.POX工艺过程环境友好,钼回收率较高.NSC氮氧化物催化压力浸出低品位钼精矿温度低、压力低、作业费用低,硫化钼转入溶液硫呈元素硫存在,研究进展十分引人注目.     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.