钠化焙钒渣同时加碳氯化挥发镓的研究

考察了低温４００℃和中国温８００℃条件下，添加活性碳及液体含碳物纸浆与钒渣、ＮａＣｌ和Ｎａ２ＣＯ３混合焙烧时氯化挥发镓及钒转化为水溶性钒的情况。本实验得到的最高ηＧａ为３５．１％。焙烧料中不含Ｎａ２ＣＯ３和焙烧温度为４００℃时，钒转化为水溶性钒的比率（ηｖ．ｔ）较低。纸浆添加比Ｌ纸浆为０．０５ｍＬ／ｇ、配料比ＷＮａ２ＣＯ３／ｗＮａＣｌ＝２时，可望同时得到较高的ηＧａ和ηｖ．ｔ。     

钠化焙烧钒渣时氯化挥发镓的实验研究

本研究在２００～１０００℃范围内对单独加ＮａＣｌ以及同时添加ＮａＣＯ３和ＮａＣｌ焙烧钒渣时镓的氯化挥发规律进行了探索。只添加ＮａＣｌ与钒渣混合焙烧，镓挥发率（ηＧａ）随ＮａＣｌ添加量增加而提高，但提高趋势不大，且钒转化为水溶性的比率很小。同时添加Ｎａ２ＣＯ３和ＮａＣ１与钒渣混合焙烧，在配料比Ｗ钒渣／（ＷＮａ２ＣＯ３＋ＷＮａＣｌ）＝８／２，ＷＮａ２ＣＯ３／ＷＮａＣｌ＝２时，８００℃下焙烧１小时，钒转     

用熔融还原的方法从浸钒渣中提镓——碳不饱和情况下的熔融还原过程

用热力学系统模型（ＳＭＴ０对浸钒渣的熔融还原过程进行了模拟；在碳不饱和状态下，对浸钒渣中的镓的还原率与加碳量、ＣａＯ的加入量、还原时间及还原温度的影响进行了研究；对１５５０～１６００℃溶解于铁液中的碳对渣中的镓的还原动力学过程进行了研究，该反应的限制性环节是渣与金属界面的化学反应。     

碱浸-还原挥发工艺回收镓锗置换渣中镓、锗

镓、锗是重要的稀散金属,从锌冶炼过程中综合回收镓、锗成为该原生金属产量的重要来源。目前主要采用酸浸工艺从镓锗置换渣回收镓、锗,回收率较低,资源利用率低。本文利用镓、锗两性物质的属性,采用碱浸-还原挥发工艺进行了回收镓锗置换渣中镓、锗的试验研究,得到以下主要结论。碱浸试验单因素最佳工艺条件为NaOH浓度4 mol/L、反应温度90℃、液固比8 mL/g、搅拌速度400 r/min,在此条件下,镓锗置换渣中镓、锗浸出率分别达到91.25%和78.95%;强化球磨浸出对镓、锗的浸出率没有改善作用;还原挥发试验的单因素最佳工艺条件为温度1 200℃、粉煤配入量30%、挥发时间4 h,在此条件下,碱性浸出残渣中锗的挥发率达到91.02%。该工艺产生的挥发残渣和砷酸钙渣返回火法炼铅系统综合回收铜、砷等有价金属,实现了渣的无害化处理。本文回收镓、锗的方法可为同类企业从锌冶炼工序中回收镓、锗提供参考。     

钠化焙烧钒渣时氯化挥发镓的热力学分析

本文讨论了６００～１２００Ｋ范围内使用ＮａＣｌ作为添加剂焙烧钒渣时氯化发镓的热力可靠性。结论是：氯氧比的大小与溶性钒酸钠生成有直接联系，ＮａＣｌ和Ｎａ２Ｏ。Ｖ２Ｏ５平衡时的氯氧比最大；在氯化钠作用下，镓主要生成ＧａＣｌ３挥发，计算得到的ＧａＣｌ３的生成压相当大。     

用NaCl对含镓钒渣进行氯化焙烧提取镓的研究

将含镓钒渣与ＮａＣｌ和碳粉混合，在５００～１３００℃下进行氯化焙烧实验以提取钒渣中的镓。实验结果表明，焙烧温度对Ｇａ２Ｏ３的氯化反应有显著的影响，Ｇａ２Ｏ３的氯化率随焙烧温度和ＮａＣｌ用量的增加而提高。在１２００℃、ＮａＣｌ和碳粉用量分别为２０％和５％条件下，对含镓钒渣进行了焙烧，钒渣中Ｇａ２Ｏ３的氯化率在７０％以上。     

从浸锌渣中高压浸出镓锗的研究

针对目前从浸锌渣中回收镓锗工艺中存在的问题,采用高压酸浸工艺处理该渣,研究了始酸浓度、温度、时间、SO2分压、液固比、搅拌线速度等对镓锗浸出率的影响。结果表明,该浸出渣经二段高温高酸浸出后,锌、铁、镓、锗的累计浸出率分别为92.79%、97.87%、94.09%、75.18%。     

钒钛磁铁矿提钒尾渣钙化碱浸试验研究

由于钒钛磁铁矿提钒尾渣中Na₂O含量高,作为炼铁配矿使用时会造成高炉结瘤问题,难以规模化利用。本文针对此问题,以承钢钒钛磁铁矿提钒尾渣为原料,进行了钙化碱浸-偏钒酸铵沉钒试验,目的是对提钒尾脱碱的同时提取其中有价金属钒。试验主要考察了浸出温度、碱浓度、氧化钙添加量和液固比对钠和钒浸出率的影响,结果表明,在浸出温度160℃、碱浓度100 g·L^-1、氧化钙添加量15%、液固比6∶1、浸出时间60 min的条件下,钒和钠的浸出率分别达到82.25%和85.36%;对含钒碱浸液进行偏钒酸铵沉钒,得到了纯度大于97%的V₂O₅产品;终渣中Na₂O含量小于0.5%,Fe₂O₃含量达到30.10%,结合承钢高炉的碱金属平衡数据,可满足高炉炼铁配矿使用。本文研究结果可为相关企业钒钛磁铁矿提钒尾渣的规模化利用提供参考。     

四氯化钛精致尾渣制备钒酸铁的研究

对四氯化钛精致尾渣进行酸浸,考察液固比、盐酸用量、浸出温度、浸出时间对钒浸出率的影响,结果表明,在液固比2∶1、38%盐酸与水的体积比1.1∶1、浸出温度40℃、浸出时间30min的条件下,钒浸出率可以达到97.1%。酸浸液调节pH后,在沉钒温度40℃、酸浸液钒初始浓度小于6g/L、终点pH1.4~2.0、氧化剂用量为理论量的5~6倍的条件下,钒沉淀率达到95.4%,沉淀物550℃煅烧3h后可以得到钒酸铁。沉钒渣和废水中和渣满足GB18599—2001中一般工业固体废物永久堆放的要求。     

用NaCl对含镓钒渣进行氯化焙烧提取镓时气相氧分压的影响

通过Ｖ－Ｇａ－Ｃｌ－Ｏ系优势区图、气相平衡组成计算和实验室研究，对用ＮａＣｌ与含镓钒渣混合焙烧提取镓时，气相氧分压产生的影响进行了分析讨论。１１２３Ｋ下Ｖ－Ｇａ－Ｃｌ－Ｏ体系的优势区图表明，在焙烧时应控制维持一定的气相氧分压，以使钒查中ＦｅＶ２Ｏ４氧化并与ＮａＣｌ作用生成水溶性钒酸钠，同时释放出氯气化钒渣中的Ｇａ２Ｏ３。在对钒渣用ＮａＣｌ进行焙烧实验时发现，当气相ｐｏ２低于０．００５ＭＰａ时Ｇａ２     

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.