某难冶型金精矿生物氧化与热压氧化工艺对比

某高砷、高碳、贫硫、微细粒难浸型金精矿直接氰化浸出金的浸出率仅为42%左右。采用"生物预氧化—氰化浸出"工艺,金浸出率达到96.3%,采用"中温中压预氧化—三段氰化浸出"工艺,金浸出率达到99.66%。并对生物氧化、热压氧化、焙烧氧化3种预处理工艺进行了对比分析,结果表明,与热压氧化、焙烧氧化相比较,细菌氧化工艺投资少、成本低,且金、银回收指标较高,经济效益较好。     

某难处理金矿热压预氧化—氰化工艺研究

国内某难处理金矿金品位为14.80×10-6,含有0.47%的有机碳,95%以上的金为金属硫化物包裹金,常规氰化浸出率仅有21.89%。采用酸性热压—氰化工艺,研究矿浆浓度、时间、温度、氧分压和转速条件等因素对金氰化浸出率的影响。结果表明:采用热压预氧化处理金矿石能有效打开金包裹,硫氧化率98%,预处理后金的氰化浸出率97%。     

某难处理金精矿的酸性热压氧化预处理研究

采用酸性热压氧化工艺对某难处理金精矿进行预处理,其金回收率可由常规浸出的35.6%提高到94.3%.针对温度、滞留时间、矿浆浓度、氧分压、物料粒度等因素对金氰化浸出率的影响进行了研究,并讨论了黄钾铁矾的生成对银回收率的影响.     

铜陵天马山含砷硫金精矿酸性氧化预处理试验研究

铜陵天马山含砷硫金精矿中金矿物嵌布粒度细且大部分被硫化矿包裹,致使金的氰化浸出难以进行。为了使金达到较好的浸出效果,在HCl-H2O2-添加剂体系中,对该金精矿进行了氧化预处理试验研究。在磨矿细度-0.048 mm占90%以上、矿浆浓度40 g/L、搅拌速度400 r/min、温度60℃、搅拌时间4 h、HCl浓度0.7 mol/L、H2O2浓度0.5 mol/L及添加剂乙二醇用量9 m L/L的氧化预处理条件下,Fe、As、Cu的溶解率分别为48.1%、99.3%和89.76%。金精矿经氧化预处理后,金的氰化浸出率比直接氰化浸出提高了33.6%,效果显著。该预处理方法可为同类含砷硫难选金精矿的开发利用提供一定的借鉴意义。     

抛刀岭难处理金精矿细菌氧化-提金实验研究

抛刀岭金矿是典型的含砷难处理金矿,针对其金精矿,结合矿石特性,考察了细菌氧化预处理效果。实验结果表明：对于含金 20.30 g/t、含砷3.39%、含硫29.8%及含铁4.10%的抛刀岭金精矿,直接氰化浸出金的浸出率仅为30%。矿石中的主要金属矿物为黄铁矿、毒砂和雄黄;脉石矿物有长石、方解石、石英和绢云母等,属于难浸金矿石。该金精矿经HQ0211菌氧化预处理8 d后,脱砷率达到46.25%,细菌氧化渣金含量达32.1 g/t,失重率为42.53%。细菌氧化渣在通气情况下进行氰化提金,NaCN浓度为0.1%、pH值为10.5~11,48 h后氰化结束,氰化渣质量由原来的300 g减少为290 g,渣率为96.67%,氰化渣中金含量从32.1 g/t降低至2.7 g/t,金的浸出率达到91.59%,氰化过程中NaCN消耗量为13.53 kg/t。HQ0211菌氧化预处理氰化提金效果显著,为该矿处理工艺提供了可靠数据,并为此类矿石的有效利用提供了参考。     

某碳质金矿石加压预氧化—氰化工艺研究

国内西南某碳质难处理金矿石,其金精矿金品位25.16 g/t,硫化物包裹金占比达94.91%,且有机碳高达6.23%。针对矿石性质,进行了加压预氧化—氰化工艺研究。结果表明:原矿、金精矿常规氰化金浸出率分别仅为14.69%、10.73%;金精矿与原矿混合配矿,利用酸性热压氧化—氰化工艺进行处理,S~(2-)氧化率达99%以上,硫化物包裹金得以裸露,当有机碳为4.27%时,金氰化浸出率在95%左右;控制初始硫质量分数为23.2%,可实现系统酸平衡;氧化液返回酸化不影响硫的氧化和金的回收,且可减少生产成本。     

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%。     

硝酸氧化工艺预处理东北寨金精矿试验研究

对采用硝酸氧化工艺预处理东北寨难浸金精矿进行了试验研究.试验结果表明:金精矿经硝酸氧化浸出后,精矿中的S、As、Fe以及其它有色金属元素进入浸出液,通过加入石灰沉淀被有效除去;氧化浸出渣中金经氰化浸出,金的浸出率可达到95.56%.     

某含锑难处理金精矿碱预处理—压力氧化—氰化提金试验

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-0.045mm80%、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%。     

难浸含砷金精矿两段生物氧化—氰化提金工艺试验研究

某难浸含砷金精矿中金矿物嵌布粒度极细,有92.00%呈次显微金（不可见）的形式存在,且金矿物嵌存状态以包裹金为主,占94.58%。对金精矿进行常规氰化浸出,金的浸出率仅为3.41%。通过采用两段生物氧化预处理—氰化提金工艺,金的浸出率提高到95.02%,比常规氰化提高了91.61%。     

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.