银锰矿中锰矿物的铁屑还原浸出工艺研究

某银锰矿中银品位为3.15×10-4,锰品位为13.28×10-2。锰矿物主要为硬锰矿和软锰矿,90%以上的银以类质同象形式分布于锰矿物中,锰银分离是实现银回收的关键。文章用铁屑作还原剂,在酸性条件下湿法浸出锰,实现锰银分离,为后续银回收工艺创造条件。当磨矿细度为小于0.074 mm粒级占80%,铁矿比1∶13,酸矿比0.6∶1,液固比3∶1,室温下浸出60 min时锰的浸出率大于97.60%,较好地实现锰银分离。     

用硫化铅精矿还原酸浸低品位软锰矿试验研究

研究了以废铁屑作添加剂、硫化铅精矿作还原剂,用硫酸浸出低品位软锰矿,考察了配料质量比、温度、硫酸浓度、反应时间、液固体积质量比对锰浸出率的影响。试验结果表明:控制浸出条件可获得96.17%的锰浸出率,铅几乎全部进入渣中;锰的浸出与S0的形成及浸出温度密切相关,硫酸浓度(矿浆pH)对S0的形成影响最大;优化后的浸出条件为m(软锰矿)∶m(铅精矿)∶m(铁屑)=3∶1∶1,反应时间2h,硫酸浓度2mol/L,浸出温度90℃,液固体积质量比5∶1,矿石粒径-74μm占90%以上。     

盐酸法富集低品位锰矿及酸介质高值再生工艺

针对印度尼西亚某低品位锰矿,提出盐酸法富集与酸介质高值再生的工艺。借助X射线衍射分析,光学显微镜和电子显微镜等表征方法进行工艺矿物学分析。结果表明:该锰矿矿物组成简单,主要由方解石、软锰矿和少量菱锰矿、褐铁矿、高岭石等组成。筛析结果显示该锰矿粒度越小,锰含量相对越高。粗碎后以2 mm筛孔的筛子过筛可得到锰质量分数为33.32%的锰中矿。锰中矿盐酸直接浸出的最佳条件为:浸出pH 3.0、浸出时间1.5 h、搅拌转速200 r·min?1、液固比4∶1 mL·g?1,此条件下产出的锰精矿品位为54.50%,钙质量分数为0.57%。常温下盐酸再生可产出二水硫酸钙晶须,其长径比可达50以上。再生盐酸返回浸出锰中矿,产出的锰精矿品位为52.16%,钙质量分数为1.39%,验证了该工艺流程的可行性。X射线衍射分析、扫描电镜及能谱分析结果显示产出的锰精矿主要组成成分为软锰矿,杂质为少量褐铁矿、高岭石等。酸介质循环时杂质将逐渐积累,当镁离子质量浓度积累到96.74 g·L?1时,采用水解沉淀法进行除杂。      

从某银锰矿中回收银

研究了以氯化焙烧－氰化浸出工艺从银锰矿中回收银，考察了氯化钠加入量、矿石粒度、焙烧时间、焙烧温度对银浸出率的影响。试验结果表明，在矿样粒度小于15mm，矿样与氯化钠质量比为10：1，焙烧温度800℃，焙烧时间4h条件下，银浸出率可达到78％，比直接氰化浸出时高56％，同时金也被浸了同。浸出渣经磨细磁选可使其中的锰富集。     

从某锰银矿提银尾渣中除铝试验研究

研究了从云南某锰银矿焙烧—氰化浸出银后的尾渣中去除铝。矿石经氧化焙烧再经氰化浸出,尾渣中锰质量分数为24.12%,氧化铝质量分数为18.58%。试验结果表明,用氢氧化钠溶液浸出100g尾渣,在NaOH质量浓度160g/L、CaO用量8g、浸出温度160℃、浸出时间150min、液固体积质量比3∶1条件下,尾渣中约90%的铝得到有效去除。     

贫锰矿和锌精矿同时浸出工艺研究

研究了贫锰矿与锌精矿同时浸出及以硫磺形式回收硫.通过试验,得到贫锰矿浸出锌精矿的最佳工艺条件为:始酸质量浓度150 g/L,温度90～95 ℃,液固体积质量比7∶1,贫锰矿过量1.5倍,硫酸过量1.5倍,浸出时间4 h.在此条件下,锰的一次浸出率为85.2%,锌浸出率为83.0%.     

高硒氰化银泥综合回收试验研究与应用

针对高硒氰化银泥的特点,采用控电氯化法对其进行预处理,并采用多羟基醛还原浸出渣中氯化银。结果表明：控电氯化工艺最佳条件为氰化银泥与硫酸质量比5∶3,氰化银泥与氯化钠质量比5∶1,液固比3∶1,加入NaClO₃控制氯化反应终电位为750 mV;浸出渣多羟基醛还原银工艺条件为氯化银与多羟基醛质量比4∶1,氯化银与碱质量比5∶3,液固比6∶1。在最佳条件下,试生产银直收率达到99%,粗银中银品位达到99%,指标较好。     

某红土镍矿加温搅拌浸出试验研究

某低品位红土镍矿的碱性脉石含量较高,矿石嵌布粒度细,平均镍品位0.91%,属难处理氧化镍矿,采用加温搅拌浸出方法可以有效地从中浸出镍.研究了加温搅拌浸出过程中各因素对镍浸出率的影响.结果表明,在温度85 ℃、矿石粒度-20目、酸矿质量比2∶5、液固体积质量比3∶1、搅拌浸出2 h条件下,镍浸出率可达60%以上.     

木薯渣—硫酸法浸出低品位软锰矿试验研究

研究了用木薯渣─硫酸法浸出低品位软锰矿,即以木薯渣作还原剂,在硫酸溶液中浸出低品位软锰矿。通过正交试验,考察了硫酸初始质量浓度、温度、固液质量体积比和反应时间对锰浸出效果的影响。结果表明,对锰浸出率影响较大的依次为温度、硫酸初始质量浓度、反应时间和固液质量体积比。单因素试验结果表明:锰浸出率随温度升高、硫酸初始质量浓度增大、反应时间延长和木薯渣添加量增加而提高;在温度90℃、硫酸初始质量浓度200g/L、反应时间4h、固液质量体积比1∶15、木薯渣与软锰矿质量比1∶6.79条件下,锰浸出率达97.32%。     

两矿法浸出回收可溶锰的试验研究

根据湖南永州焙烧粉浸出率不高的问题,其全锰含量22.38%,可酸浸的二价锰含量15.62%,这意味着矿石中相当一部分的高价态的锰(6.76%品位)具有可挖掘回收的潜在价值。本次试验主要采用碳酸锰矿与永州焙烧粉混合浸出,利用其中的还原性成分,考察永州焙烧粉浸出率提升的效果。     

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.