酒钢镜铁矿尾矿中铁矿物再回收试验研究

酒钢选矿厂排出的镜铁矿强磁选尾矿铁品位约为28%,有较高的回收价值。为回收其中的铁矿物,本研究基于该强磁选尾矿工艺矿物学,对其进行反浮选—磁化焙烧—磁选试验研究。研究结果表明：该强磁尾矿经过一粗一精的反浮选试验流程,可得到铁品位为43.88%的浮选精矿,其作业铁回收率为50.93%。经过磁化焙烧后得到焙砂,焙砂进行一粗一精的磁选试验后可得到铁品位为62.37%的磁选铁精矿,其作业铁回收率为83.39%。     

大冶铁矿强磁选精矿磁化焙烧热力学研究

磁化焙烧-磁选分离的技术路线,是解决菱铁矿含量较高的大冶铁矿尾矿中低品位难选红铁矿(w(TFe)=34%左右)的有效工艺.其焙烧工艺参数对工艺效率影响较大.对其热力学反应条件进行了分析,依靠碳酸铁的自身分解产物CO和还原气氛,大冶低品位含菱铁矿弱磁性铁矿能在弱还原气氛条件下,在10～0 s内完成整个磁化焙烧过程.磁化焙烧后,弱磁选精矿铁品位大大提高(w(TFe)》60%).     

混合稀土精矿还原焙烧磁选工艺研究

利用还原焙烧技术将内蒙古某混合稀土精矿中铁矿物还原为金属单质,经过磁选分离实现了铁与稀土、铌等元素的高效分离及富集。通过单因素实验考察了还原温度、焙烧时间、配碳量条件对还原焙烧效果的影响,以及不同焙烧温度下稀土和铌富集、回收的情况。在焙烧温度1 175℃,焙烧时间90 min,配碳量C/O为1.5的优化条件下,铁金属化率达到92.52%,磁性物中铁品位为89.71%,铁回收率为92.12%,而非磁性物中铌品位及回收率为3.85%和87.92%;稀土品位及回收率达到7.15%和88.23%。     

白云鄂博地区尾矿中铁、铌、稀土、萤石综合回收研究

白云鄂博地区稀土尾矿中主要有价矿物为磁铁矿、赤铁矿、氟碳铈矿、独居石、萤石和少量铌矿物。其中TFe(全铁)、REO(稀土氧化物)、Nb_2O_5、CaF_2含量(质量分数)分别约达到27.67%,6.02%,0.16%,24.63%。有价组分嵌布粒度细,有价组分相互之间以及与脉石矿物的嵌布特征复杂。根据尾矿的矿物学性质,采用铁、稀土、铌与萤石强磁选-稀土、萤石分别浮选浮选-铌铁还原焙烧-弱磁选工艺对铁、稀土、铌和萤石4种组分进行综合回收,并对联合流程中的各工艺参数进行优化,最终能够分别得到4种精矿产品。TFe,REO,Nb_2O_5和CaF_2的回收率分别为80.04%,36.91%,49.82%和75.67%。铁(TFe)、稀土(REO)、铌(Nb_2O_5)和萤石(CaF_2)的品位分别达到74.79%,30.12%,0.2410%和80.08%。     

用磁化焙烧—磁选工艺从粗铌精矿中回收铁富集铌的试验研究

针对粗铌精矿铁含量较高的特点,提出了采用还原磁化焙烧—酸浸工艺从粗铌精矿中回收铁、富集铌.以活性炭为还原剂进行磁化焙烧,用XCGS磁选管进行磁选,考察了还原温度、还原时间和激磁电流对磁选铁精矿指标的影响.结果表明,在750℃下还原45 min,粗铌精矿中的绝大部分赤铁矿被还原成磁铁矿,还原度接近理论值;还原矿在1.2A激磁电流下磁选得到铁精矿,铁品位为60.80％,收率为98.81％;磁选尾矿酸洗后,79.36％的铌留在尾矿中,Nb2O5品位达到12.46％.     

镍红土矿酸浸渣生物质磁化焙烧-磁选回收铁精矿试验研究

研究了生物质磁化焙烧-磁选处理镍红土矿酸浸渣的试验过程,讨论了各因素对磁化焙烧效果的影响。试验结果表明:在焙烧温度800℃、焙烧时间60 min、生物质还原剂质量分数为25%、磁场强度为140 kA/m的条件下,酸浸渣中铁的回收率达到95.41%,磁选精矿铁品位达到63.06%,硫含量降低为0.12%,符合高炉炼铁所需铁矿的标准。     

牙买加赤泥提铁实验研究

通过实验室试验,对牙买加赤泥分别进行了直接还原-磁选和磁化焙烧-磁选两种工艺方案的提铁实验研究。试验结果表明:采用磁化焙烧-磁选工艺方案,最终得到的铁精矿品位最高为31.84%,铁回收率最高57.46%;采用直接还原-磁选工艺方案,最终得到的金属化铁粉的铁品位最高34.62%,金属化率42.20%,铁回收率最高65.04%。     

响应曲面法优化锯末磁化还原高炉灰工艺研究

利用锯末为焙烧高炉灰提供还原气氛,回收高炉灰中的铁,在绿色节能的同时实现高炉灰资源化利用。通过响应曲面法设计分析了焙烧温度、焙烧时间和还原剂配比对磁选精矿中铁品位、回收率的影响,并建立自变量与响应值间的数学预测模型,确定了磁化焙烧回收高炉灰中铁的最优工艺条件：焙烧温度686.65℃、焙烧时间25.03 min、还原剂配比1:8.6,在此条件下得到预测磁性铁品位68.325%、回收率90.945%,试验验证值与模型预测值相差在0.3%以内,表明该模型优化结果可靠,可应用于锯末磁化焙烧高炉灰提铁过程。     

磁选-重选-浮选组合新工艺分选氟碳铈矿型稀土矿的试验研究

采用矿物自动分析仪(MLA)查明了四川牦牛坪稀土矿的矿物组成、嵌布粒度特征,对比分析了主要矿物的密度、莫氏硬度、比磁化系数和磁性的工艺特性差异,利用湿式高梯度强磁选-重选-浮选的组合工艺进行了选矿试验研究。结果表明:主要稀土矿物氟碳铈矿粒度多在1.28~0.04 mm范围内,具有顺磁性,而重晶石、萤石、正长石和石英呈现非磁性,此磁性差异是强磁选能预先富集的关键矿物学因素。通过实验确定最佳工艺条件和结果为:在-1.0 mm粒径,1.0 T背景场强下湿式强磁选粗选,强磁选精矿分级成3个粒级物料,-1.0~+0.4 mm物料进行粗砂摇床重选,-0.4+0.074和-0.074 mm物料分别进行细砂摇床重选,各重选中矿合并,在0.6 T背景场强下湿式强磁选精选,磁选精矿与重选精矿合并,获得REO品位65.49%,回收率67.80%的磁重稀土精矿;磁选精选中矿与摇床尾矿合并成REO 2.10%的稀土中矿,在磨矿细度-0.043 mm占70%,pH 8~9,水玻璃用量714 g·t~(-1)原矿,捕收剂GSY 1033 g·t~(-1)原矿下进行常温浮选,获得REO品位67.84%,回收率15.46%的浮选稀土精矿;两种稀土精矿REO平均品位65.93%,总回收率83.26%。     

添加剂对低品位稀土铌铁粗精矿还原焙烧过程微观分离机制的影响

研究了添加剂对低品位稀土铌铁粗精矿还原焙烧过程中Fe与稀土、Nb分离的影响。结果表明,31.9%TFe、3.16%REO、2.91%Nb_2O_5的稀土铌铁粗精矿直接还原焙烧,磁性物Fe品位仅为54.45%,非磁性物中稀土和Nb的回收率仅为44.28%和62.65%。添加15%Na_2SO_4、5%活性炭进行还原焙烧效果最好,产物中磁性物质Fe品位为89.32%,Fe回收率为91.47%,非磁性物质中REO、Nb_2O_5含量分别为5.36%、4.62%,其回收率分别达到96.09%和95.83%。微观结构研究结果表明,未加添加剂时,焙烧产物中Fe颗粒细小,且与其他矿物界限不清晰,大部分稀土、Nb晶粒聚集程度较弱,晶粒间结合不紧密,分选效果不理想。在Na_2SO_4和活性炭的协同作用下,还原焙烧产物中Fe、稀土和Nb晶粒均聚集长大,Fe与稀土、Nb和脉石矿物间界限分明,利于分离。     

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.