甘肃某复杂难处理金矿细菌氧化—氰化实验研究

以甘肃某含硫、砷、碳及锑等多种成分的难处理金矿为研究对象,开展了细菌氧化—氰化实验研究。浸矿菌种为HQ0211,该菌种经长期驯化,耐砷性良好。在浸出过程中,通过测量矿浆的pH 值、电位值、Fe2+质量浓度和液砷含量,来考察不同矿浆浓度对浸出效果的影响。实验结果表明：HQ0211混合菌种适宜氧化该复杂难处理金矿。经该菌种氧化预处理后,脱硫率最高可达81.53%,脱砷率最高可达86.88%,脱碳率最高可达58.32%,脱锑率最高可达40.09%。与未经处理的原矿氰化提金结果相比,经过细菌氧化预处理后,金的回收率最高可达98.65%,相比直接氰化浸出提高了40.56%。     

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。     

新疆哈图金矿金精矿细菌氧化一氰化提金试验研究

新疆哈图金矿矿石易浮选,难氰化浸出。金精矿直接氰化试验金浸出率仅为50％。采用细菌氧化-氰化提金工艺,金浸出率达到97．12％,试验指标较为理想。     

广西某含砷含碳微细粒难选冶金矿选矿试验研究

针对广西凤山某含砷含碳微细粒难选冶金矿矿石进行了选矿试验研究。通过采用原矿浮选—浮选金精矿热压氧化—氰化炭浸工艺流程,获得了较好的技术指标:浮选粗精矿金品位12.32 g/t,金浮选回收率91.36%,砷、硫的氧化率均为98.68%,金的氰化浸出率92.42%,金的总回收率为84.43%。     

高砷高硫金精矿细菌氧化——氰化提金试验研究

介绍了我国难处理金矿资源的储量、分布与常规利用现状, 以及国内外利用焙烧、加压与生物氧化预处理后工业利用各种工艺技术, 并就广西某金矿高砷高硫金精矿利用耐高砷细菌氧化后, 与氰化提金各种条件进行试验, 取得金浸出率达94.17%的理想指标。     

某中硫含铜金矿石的细菌预氧化——堆浸提金试验研究

河北某金矿矿石属中硫含铜难浸金矿石，其中包裹金含量达28.77%。该矿石常规全泥氰化金浸出率仅为51.78%。本试验在堆浸前对矿石进行了细菌氧化预处理，试验结果表明：0－5mm粒级矿石经45d氧化后，Fe的氧化率为28．16％，S的氧化率为25．43％，Cu的氧化率为44．62％，氰化堆浸金的浸出率可达80.35%。     

某难浸金精矿细菌预氧化工艺研究

通过对陕西省某金矿难浸金精矿工艺矿物特性和细菌预氧化工艺的研究，说明了该金精矿为低砷低硫微细粒包裹型难浸金精矿，金精矿中金的直接氰化浸出率为35．3％，经过5d细菌预氧化后，金的氧化浸出率可达到92．5％。     

利用高盐水氧化提取高脉石矿物难处理金矿中金

针对矿区所在地的地表水和地下水盐度高、淡化水生产成本高、影响难处理金矿资源的利用问题,采用矿山含氯高盐水,对高碱性脉石难处理金矿进行次氯酸钠氧化—氰化提金试验,考查了次氯酸钠用量、氧化时间、氰化工艺等对金浸出率的影响。次氯酸钠用量94.5kg/t以上氧化处理2~4h后,金浸出率从直接氰化浸出的26.8%升高至88.1%~97.6%,氰化尾渣金品位降至0.07~0.36g/t。     

某难选矿石提金工艺研究

本文介绍了吉林省某金矿难选冶矿石提金工艺结果。该矿石难选冶的原因在于金嵌布粒度微细，且大量自然金以显微或超显微状态包裹在毒砂及黄铁矿矿物之中，另含有一定量的有机炭。试验采用原矿氰化－浸渣浮选－浸渣浮选精矿碱浸热压氧化－氧化渣氰化提金工艺，获得了金总回收率为９０．５０％～９１．５３％的结果．     

提高含砷碳难处理氧化金矿石选冶回收率的试验研究

广西某地区金矿石为含砷碳难处理氧化金矿石,常规选矿回收率较低,仅为83.00%;金精矿氰化回收率为50.30%,选冶综合回收率为41.50%。为了提高该矿石选冶回收率,综合采用全泥氰化法、焙烧氧化预处理、细菌氧化预处理、加压氧化预处理及常规浮选后精矿再氰化等多种选冶方法开展试验研究,最终选用细菌氧化预处理后精矿再氰化的生产工艺处理该矿石,实现选冶回收率达到95.00%的良好技术指标。     

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.