采用电位控制浮选法分离北帕克斯铜金矿中的砷和铜

为了经济地开发北帕克斯高砷地区的铜金矿体,需要脱除存在于矿石中的砷黝铜矿((Cu,Fe)12As4S13),以使铜精矿中的砷含量达到冶炼厂的标准(＜2000·10-6)要求.应用电位控制浮选法有可能从北帕克斯高砷矿石的钻探岩芯综合试样中选择性浮选分离砷黝铜矿和黄铜矿(CuFeS2)及斑铜矿(Cu5FeS4).对铜砷混合浮选精矿进行铜砷分离.在矿浆还原电位大约为-150 mV(SHE)和pH 12条件下,将砷黝铜矿浮选出来,从而与其它含铜矿物分离开.分离的依据是,砷黝铜矿下临界矿浆电位比黄铜矿下临界矿浆电位低,在还原范围内,有一个电位差,因此砷黝铜矿强烈上浮,而黄铜矿则不能上浮.在所研究的氧化电位范围内,浮选分离砷黝铜矿和黄铜矿的选择性很低或没有选择性.As品位为0.11%和Cu品位1.2%的综合试样试验结果表明,用该法可以分选出铜回收率为52%和含2600·10-6As的低砷高铜精矿.计算机模拟结果表明,用该法分离200·10-6 As,1%Cu的原矿,浮选分离效率很好,低砷铜精矿铜回收率为61%,其中含2000·10-6以下的砷.根据本研究结果,提出了从北帕克斯铜金矿石中浮选脱除砷的原则工艺流程,并对此进行了讨论.     

含砷铜精矿铜砷分离试验研究

以蓝辉铜矿和硫砷铜矿为主的浮选铜精矿,为了产品效益最大化,进行浮选分离获得高砷铜精矿和低砷铜精矿。蓝辉铜矿和硫砷铜矿纯矿物试验结果表明,在捕收剂丁铵黑药体系下,采用石灰调整矿浆pH值,分别添加次氯酸钙、高锰酸钾、腐殖酸钠以及木质素来抑制蓝辉铜矿,均可以起到很好的抑制作用,但不同的药剂在不同的矿浆pH值条件下抑制效果不同。针对铜品位为20.52%,含砷1.22%的某含砷铜精矿,采用活性炭搅拌-脱水-洗涤-抑铜浮砷工艺,以高锰酸钾配合次氯酸钙为调整剂,抑制不含砷硫化铜矿,获得高砷铜精矿铜品位为32.87%,砷含量4.93%,铜回收率为29.97%,砷回收率75.50%;低砷铜精矿铜品位为17.68%,砷含量0.37%,铜回收率为70.03%,砷回收率为24.50%。铜砷分离效果较好。     

哈萨克斯坦某高砷铜矿选矿试验

哈萨克斯坦某高砷铜矿铜品位0.94%,砷含量高达6.93%,并可伴随回收银。铜主要存在于黄铜矿中,单体解离难度较大,以硫化铜形式存在的铜占总铜的90.43%。为合理开发利用该资源,对其进行选矿试验。在1段、2段磨矿细度分别为-0.074 mm 65%、-0.045 mm 90%时,以石灰为调整剂,BK320为粗选捕收剂,BK501为精选抑制剂,采用2粗3精2扫闭路浮选流程处理,可获得铜品位29.63%、回收率89.93%,含砷0.16%、含银906.00 g/t的铜精矿,控制了铜精矿中砷的含量,并综合回收了银,指标较好,可为该铜矿选别流程的确定提供参考。     

某铜矿铜砷矿物分离研究

某铜矿主要铜矿物以蓝辉铜矿和硫砷铜矿为主,蓝辉铜矿与硫砷铜矿物理化学性质相似,可浮性相近。采用等可浮浮选-铜砷再分离工艺流程,优先获得可浮性较好的铜砷粗精矿,再进行铜砷粗精矿分离浮选,分别获得高砷铜精矿和低砷铜精矿,最后通过扫选获得另一部分低砷铜精矿。研究了磨矿细度,粗选氧化剂用量及铜砷分离氧化剂用量对铜砷分离指标的影响。闭路试验获得含铜21.78%,砷0.43%,铜回收率57.94%,砷回收率20.70%的低砷铜精矿和含铜16.26%,砷1.18%,铜回收率27.21%,砷回收率35.98%的高砷铜精矿。     

西藏某细粒嵌布难选硫化铜矿选矿实验研究

西藏某细粒嵌布难选硫化铜矿含铜0.45%,含硫3.1%,铜氧化率9.91%,矿石中铜矿物以黄铜矿为主,黄铜矿分布极不均匀,部分呈微细粒状,与脉石不易单体解离,是影响铜矿物回收的重要因素。实验采用铜硫混浮、粗精矿再磨后铜硫分离、铜硫混浮尾矿脱硫的工艺流程,药剂制度以石灰为调整剂,A4和丁铵黑药为铜矿物捕收剂,戊基黄药为黄铁矿捕收剂,MIBC为起泡剂,闭路实验取得了良好的选矿技术指标:铜精矿铜品位25.32%,铜回收率85.56%;金品位21.02 g/t,金回收率63.37%;银品位119.25 g/t,银回收率80.53%。同时,获得一个含硫19.82%、回收率78.20%的硫精矿,矿石中的黄铁矿得到综合回收。      

硫砷铜矿与黄铜矿的优先浮选

硫砷铜常与黄铜矿伴生在一起,由于表面性质相似,在常规浮选条件下,它们通常都一同富集在铜精矿中,精矿中含有大量的砷将给后续的冶金处理带来,困难,因此,在浮选过程中应考虑降砷的问题,常规的抑制剂如石灰,氰化物,硫化物以及高锰酸盐都不能有效地实现硫砷铜矿与黄铜矿的分离。本研究找出了两种优选浮选方法,有效地实现了硫砷铜矿与黄铜的分离,其一是当黄药用量为２０ｍｇ／ｌ,在电位－２５０ｍＶ,ｐＨ９．０条件下,抑制黄铜矿而浮选硫砷铜矿;其二是在相同的ｐＨ的黄药浓度下,采用２５０ｍｇ／ｌ的镁铵混合物抑制硫砷铜矿而浮选黄铜矿,实现硫砷矿与黄铜矿的浮选分离,矿物表面的红外光谱检测光谱检测表明,在硫砷铜矿表面发现有亲水的络合阴离子,而黄铜矿表面则没有吸附这种络合物,含１．７３％砷的人工混合样浮选获得的铜精矿伸砷品位为０．１４％,砷的去     

硫化铜矿中有害元素的赋存特征对铜回收的影响

硫化铜矿的选别过程中,除了需要关注矿石的结构、铜的赋存状态、铜矿物的种类等影响铜选矿回收率的关键矿石基因种类外,在有害元素含量较高时,还应该关注与有害元素相关的矿石特性,以全面评价对铜回收产生的影响。某高砷硫化铜矿由于大部分的铜、砷都赋存在硫砷铜矿中,且硫砷铜矿、砷黝铜矿等含砷的铜矿物和辉铜矿、斑铜矿等不含砷的铜矿物之间共生关系密切。这样的矿石特性决定了虽然选别在以铜集合体为目标,保证较高的铜回收率,但由于铜、砷难以通过物理方式分离,铜精矿中砷超标成为必然。     

从西藏某斑岩型硫化铜矿中综合回收铜金浮选新工艺

西藏某斑岩型铜矿中含铜1.10%～1.30%、含金0.04～0.08g/t,矿石中铜矿物以辉铜矿为主、黄铜矿次之,铜矿物嵌布粒度细、且嵌布关系复杂,金主要与铜矿物和黄铁矿伴生,原有工艺铜精矿中的金难以富集到1g/t以上,且铜回收率偏低。为高效综合回收矿石中的铜金资源,开发了低碱条件下"铜硫部分混合浮选"新工艺,并以新型捕收剂ZH-01为铜硫混选的捕收剂,铜硫混选粗精矿经一次精选后,获得合格的铜精矿。实验室小型闭路试验结果表明,在磨矿细度-74μm含量占70%、原矿含铜1.21%、含金0.06g/t的条件下,获得了含铜35.27%、铜回收率94.12%,含金1.11g/t、金回收率56.23%的铜精矿。与现场工艺相比,新工艺不仅提高了铜的回收率,伴生金也得到了综合回收,实现了矿石中铜金的高效综合回收。     

都龙锌锡铜多金属矿中铜精矿提质试验研究

针对都龙矿区以锌锡为主含低品位黄铜矿的多金属硫化矿,由于原矿含铜品位较低铜锌矿物嵌布粒度不均且互含关系密切,加之原矿中含滑石、云母等易浮脉石矿物的影响,采用优先选铜的原则流程及常规黄药类组合捕收剂获得的铜精矿指标不尽理想,铜精矿含铜品位16%左右、含锌品位高达9%以上,铜精矿回收率仅50%左右,难以达到铜矿物与锌矿物及脉石矿物间的高效分选回收的目的。通过对选铜药剂制度的优化研究,获得了铜精矿含铜品位21.54%、含锌品位6.41%,铜精矿回收率53.85%的选铜指标,与原药剂制度相比,铜精矿中的锌矿物及易浮脉石矿物的含量大幅度降低,选铜指标得到明显提升。     

都龙锌锡铜多金属矿铜精矿提质试验研究

针对都龙矿区以锌锡为主含低品位黄铜矿的多金属硫化矿,由于原矿含铜品位较低铜锌矿物嵌布粒度不均且互含关系密切,加之原矿中含滑石、云母等易浮脉石矿物的影响,采用优先选铜的原则流程及常规黄药类组合捕收剂获得的铜精矿指标不尽理想,铜精矿含铜品位16%左右、含锌品位高达9%以上,铜精矿回收率仅50%左右,难以达到铜矿物与锌矿物及脉石矿物间的高效分选回收的目的。通过对选铜药剂制度的优化研究,获得了铜精矿含铜品位21.54%、含锌品位6.41%,铜精矿回收率53.85%的选铜指标,与原药剂制度相比,铜精矿中的锌矿物及易浮脉石矿物的含量大幅度降低,选铜指标得到明显提升。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

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Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.