我国将重点推广铅闪速熔炼技术

国家发改委将重点推广铅闪速熔炼技术,预计到2015年,该技术推广比例可达30％,总节能量约15万吨标准煤／年。公告显示,2009年我国粗铅冶炼综合能耗332kg标准煤／t铅,铅冶炼综合能耗475kg标准煤／t铅。铅闪速熔炼技术由于充分利用了硫的氧化热,并实现自热熔炼,粗铅冶炼能耗达到0．23t标准煤／t铅,铅总回收率可达98．5％,烟气SO2浓度大于20％时,总硫利用率大于97％,硫捕集率大于99％。     

铅冶炼物料工艺矿物学与热力学平衡研究

富氧熔池熔炼-液态高铅渣直接还原工艺因对原料适应性强、熔炼炉运行稳定可靠、金属回收率高及氧化炉熔炼烟气中二氧化硫浓度高,在铅冶炼工业中占有越来越重要的地位。但目前对于该工艺的理论基础研究较为薄弱,亟需对该工艺冶炼过程热力学平衡等进行理论研究,为工艺的优化提供理论支持。首先对冶金过程物料如铅精矿、高铅渣及还原渣进行了工艺矿物学研究,然后通过FactSage8.1热力学软件计算,研究了氧化段氧气系数、熔炼温度及还原段还原剂用量对体系中Pb分配率和熔炼渣中Pb、S等元素含量的影响规律。计算得出,铅富氧熔池氧化熔炼中铅的直收率在氧气系数1.0、熔炼温度1 200℃左右时达到最高;温度的升高与FeO、CaO的加入有利于高铅渣还原反应的进行,在还原剂用量大于5.7%时铅的还原率达到91%。     

含铜炉渣的火法强化贫化

研究了白银炉钢精矿富氧自热熔炼渣在空气搅拌下,火法贫化的机理,讨论了碳质还原剂碎煤,硫化剂黄铁矿精矿及溶剂CaO含量等因素对渣含铜的影响．结果表明,尽管各因素互相作用,但影响渣含铜的关键变量是还原剂与硫化剂．在黄铁矿添加率为6．4％、碎煤添加率为0．8％、保持渣中CaO6％左右时．可使渣含铜降到0．41％．     

从废铅膏回收铅的炉料新配方

为克服以铁屑作还原剂熔炼废铅膏存在的缺点,建议采用非铁还原剂。用正交法确定了新的炉料配方:碳5、苏打5、氧化硅0.5、氧化钙0.5(％)。新方法可以降低渣中铅损失,提高铅回收率,节省能量。     

氧气侧吹直接炼铅新工艺的开发与应用

氧气侧吹直接炼铅半工业试验结果表明:铅精矿和含铅物料在氧气侧吹炉内熔炼,用煤作还原剂,可直接产出粗铅。铅回收率大于96%,渣含铅低于2%,烟气中SO2浓度高达24%,可直接制酸处理。该工艺具有投资少、效率高、流程短、设备简单和低污染等特点,可以广泛应用于铅冶炼工业化生产。     

控电氯化选择性浸出处理铅阳极泥技术北大核心

介绍了控电氯化选择性浸出处理铅阳极泥技术,酸浸渣经碱转化后火法熔炼产出粗银,粗银电解得到电解银。该工艺简化了铅阳极泥的处理过程,不污染环境,无火法冶炼所产氧化渣、烟尘有价金属难以综合回收的问题。     

控电氯化选择性浸出处理铅阳极泥技术

介绍了控电氯化选择性浸出处理铅阳极泥技术,酸浸渣经碱转化后火法熔炼产出粗银,粗银电解得到电解银。该工艺简化了铅阳极泥的处理过程,不污染环境,无火法冶炼所产氧化渣、烟尘有价金属难以综合回收的问题。     

碱煮黑白钨渣与赤泥协同碳热还原回收制备铁锰钨锡合金

基于赤泥中含有碱煮黑白钨渣碳热还原所需助熔剂和铁等有价金属,本文采用碱煮黑白钨渣与赤泥协同碳热还原回收制备铁锰钨锡合金,并分离砷、铅、铋等有害元素。通过考察碱煮黑白钨渣与赤泥质量比、还原剂用量、还原温度、熔炼时间对金属合金化率的影响,确定较优的协同处置碳热还原工艺条件为：碱煮黑白钨渣与赤泥质量比为1∶1、还原剂用量为8%、熔炼温度为1 550℃、熔炼时间为120 min。在此条件下,铁、锰、铌、锡、钨、钽的合金化率分别为99.40%、23.75%、25.08%、89.46%、40.94%、17.53%;砷、铅、铋等有害元素还原进入烟尘。通过碱煮黑白钨渣与赤泥协同处置碳热还原的研究,既能回收有价金属,又减少了助熔剂等额外资源消耗,对资源化发展提供了新的研究方向。     

氧气底吹炼铅先进工艺的节能减排效果与分析

本文通过对实际生产数据的分析计算证实：氧气底吹强化熔炼＋鼓风炉还原工艺与烧结＋鼓风炉炼铅工艺相比,单位粗铅综合能耗节省37％以上,排放的SO2和烟粉尘等主要污染物分别减少85％～98％。对采用熔池熔炼直接还原液态高铅渣、进一步改进完善氧气底吹炼铅工艺可能达到的节能减排效果进行了估算预测,认为粗铅冶炼的能耗和环保指标将因此达到世界先进水平。     

碱性电弧炉冶炼高硫不锈钢

介绍了７ｔ碱性电弧炉冶炼高硫不锈钢的工艺特点。采取氧化法和二次造渣工艺有效地控制了碳和硫，铬的回收率为９７．３３％，还原期利用添加黄铁矿和选择ＭｇＯ－ＳｉＯ２－ＣａＯ－Ａｌ２Ｏ３渣系，熔炼中的最高硫含量达到０．６３２％，硫的平均回收率为９３．７２％。     

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.