某复杂难处理硫精矿综合回收的试验研究

以昆明某复杂难选硫精矿为原料，先在马弗炉中进行了焙烧脱硫砷的条件试验，得出了焙烧的最佳操作条件后，以沸腾炉(工业生产炉床面积74 m²)中产出的烧渣为原料进行了氰化提金银的条件试验。该硫精矿综合处理的最佳条件为：焙烧温度840～870℃,焙烧时间2～2.5 h;烧渣磨矿细度-0.038 mm≥90%,氰化钠加入量2 kg/t,浸出液固比2∶1等，此时硫脱除率达99%以上，金浸出率达84%;经分析氰化尾渣可作为铁精矿出售。该项目已在云南某企业建成处理量300 t/d复杂含金硫精矿提金的工业生产线。     

高硫铝土矿微波焙烧脱硫预处理及焙烧矿高压溶出性能

采用微波焙烧方式研究高硫铝土矿的脱硫效果,并对焙烧脱硫后的焙烧矿进行拜耳法溶出,研究了微波焙烧条件对氧化铝溶出率的影响。结果表明,高硫铝土矿微波焙烧脱硫,焙烧温度相较于焙烧时间对脱硫率的影响更为显著,焙烧温度由100 ℃升高到600 ℃,脱硫率可平均提高约30%,而焙烧时间由2 min延长至20 min,脱硫率仅平均提高12%。在600 ℃焙烧20 min,可将铝土矿全硫含量由3.875%脱除至0.223 5%,脱硫率达到95.11%。同时,微波焙烧温度对氧化铝的溶出率影响也较显著,随着微波焙烧温度升高,氧化铝的相对溶出率有先提高后下降的趋势,微波焙烧温度为400 ℃时,焙烧矿的氧化铝相对溶出率达到最大,为94.77%;当焙烧温度高于400 ℃时,焙烧矿会出现大量刚玉（Al₂O₃）相,是导致氧化铝相对溶出率下降的主要因素。      

高硫铝土矿分散态焙烧脱硫试验

采用自制的分散态焙烧炉,对硫含量1.61%的高硫铝土矿进行焙烧脱硫。考察脱硫效果随焙烧温度和时间的变化规律,并探讨了焙烧脱硫的机理。结果表明,在650℃焙烧120s时,分散态焙烧可以实现76.98%的脱硫率,焙烧矿残硫为0.07%,延长焙烧时间或升高温度对提高脱硫率帮助不大。     

氯化挥发法从含有价金属硫铁矿精矿中回收金银

对某硫铁矿精矿进行有价金属回收的实验室小型试验及扩大连续试验。在氧化焙烧—润磨造球—氯化挥发的原则流程下,确定了实验室最佳试验条件:氧化脱硫焙烧温度700℃、焙烧时间1.0h、无水氯化钙添加比例7.0%、焙砂再磨细度-0.038mm占70%、氯化焙烧温度1 100℃、焙烧时间1.0h,在该条件下,氧化焙砂的砷脱除率为82.39%,硫脱除率为99.99%,金、银、铜的挥发率分别为96.37%、85.97%和70.61%,球团中铁的品位为61.03%。连续扩大试验结果表明,物料中金、银、铜的挥发率分别达到96.72%、90.91%和52.48%。     

钴硫精矿的硫酸化焙烧浸出研究

针对含钴高、含硫低且有相当数量铜的钴硫精矿进行焙烧-浸出,考察了焙烧温度、焙烧时间、添加剂用量、浸出时间、浸出温度及液固比等对铜和钴浸出率的影响。结果表明,钴硫精矿混合均匀后以2.7℃/min升温至620℃,焙烧3h,焙砂在80℃、用30g/L硫酸33%矿浆浓度浸出2h,钴、铜的浸出率分别为91%、90%。     

某难处理金精矿焙烧—氰化提金工艺试验研究

针对某难处理金精矿,采用焙烧-氰化提金工艺进行实验研究。试验得到的最佳条件为:金精矿粒度-0.043 mm 52.85%、一段焙烧温度450℃、时间1 h(炉门关闭),二段焙烧温度700℃(炉门稍开),焙烧时间0.5 h;初始氰化钠浓度0.5‰、L/S=4、氰化时间24 h。在此条件下硫、砷的脱除率分别为99.99%、52.56%,金的浸出率为88.92%。     

低品位硫精矿富氧焙烧反应动力学计算

针对硫精矿中硫的脱除问题,研究了低品位硫精矿在富氧条件下焙烧反应的动力学过程。利用XRD、SEM和EDS分析了硫精矿氧化焙烧过程的矿相变化规律。同时,根据其热分析的DSC和TG曲线,采用AcharBrindley-Sharp-Wendworth微分法和Coats-Redfern积分法分别计算了脱硫反应的动力学参数,确定了硫精矿不同温度段脱硫的反应机制。结果表明:随着温度的升高,复杂的硫精矿逐渐被氧化成赤铁矿,其中伴随着中间产物硫酸铁的生成与分解;而且焙烧矿的硫含量也随温度升高而逐渐降低。动力学计算结果表明,在430~975℃的温度范围内,硫精矿氧化焙烧分为4个阶段进行,在前3个阶段,脱硫反应机理均符合Avrami-Erofeev方程,为随机成核和随后生长的化学反应控制,只是反应级数和表观活化能在不同阶段各不相同;在第4阶段,脱硫反应机理符合Z-L-T方程,为残余硫化物的三维扩散控制,反应的表观活化能分别为10.812和9.920kJ/mol,在4个温度段中是最低的。     

低品位铝土矿的高效脱硫脱硅工艺研究

通过采用悬浮焙烧-碱浸脱硅的方式对铝土矿进行处理,并研究了焙烧温度、苛碱浓度、碱浸温度对焙烧矿碱浸脱硅的影响。结果表明,悬浮焙烧较优温度为930 ℃,在碱浸脱硅条件下液固比为8∶1,脱硅时间为30 min,苛碱浓度为110 g/L,脱硅温度为95 ℃时,可获得较高脱硅率,可达49.24%。Al₂O₃损失率为2.03%,精矿铝硅质量比可提至8.21,悬浮焙烧的脱硅精矿实际溶出率最高可达94.79%。采用石灰为脱硅剂,对碱浸脱硅后的碱液进行脱硅后,可对焙烧矿进行循环脱硅利用,脱硅后的精矿铝硅比均可达到7以上,从而使碱液实现了循环利用。      

某难处理金精矿焙烧—氰化提金工艺试验研究

针对某难处理金精矿,采用焙烧—氰化提金工艺。试验得到的最佳条件：金精矿粒度为-0.043 mm占52.85%,一段焙烧温度为450℃,焙烧时间为1 h（炉门关闭）,二段焙烧温度为700℃（炉门稍开）,焙烧时间为0.5 h;初始Na CN浓度为0.5‰,L/S=4,氰化时间为24 h。在此条件下,硫、砷的脱除率分别为99.99%和52.56%,金的浸出率为88.92%。     

某含锑难处理金精矿碱预处理-压力氧化-氰化提金试验研究

对某含锑难处理金精矿采用碱预处理—压力氧化—氰化回收金进行研究。考察了预处理碱浓度、浸出时间和温度对锑脱除率的影响,并考察了矿浆浓度、氧分压、反应温度和反应时间对氧化渣硫氧化率的影响。结果表明,含锑金精矿在细度-0.045mm>80%、NaOH 50g/L、浸出时间3h、浸出温度90℃、液固比4∶1的条件下碱预处理脱锑,锑脱除率95%。碱预处理渣在矿浆浓度40%、氧分压0.7～0.8MPa、反应温度200℃,停留时间30min条件下,平均硫氧化率97.12%。加压氧化渣氰化,渣计金浸出率超过95%。     

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.