蚀变岩型低品位金矿中金的赋存状态量化研究

蚀变岩型金矿是一种重要的金矿石类型。采用化学分析、X射线衍射（XRD）、工艺矿物学参数自动分析系统（BPMA）、扫描电子显微镜（SEM）、X射线能谱（EDS）等技术,对胶东地区新立蚀变岩型金矿石中金的赋存状态进行量化研究。结果表明：矿石金品位为2.2g/t,金属硫化物主要为黄铁矿,含少量方铅矿和微量黄铜矿;脉石矿物主要为石英和绢云母,含少量钾长石等。金矿物为金-银互化物,其中银金矿占85.33%,金银矿占13.84%,自然金占0.83%;金矿物平均成色为620.8 ‰;载金矿物以黄铁矿为主,与黄铁矿存在镶嵌关系的金矿物占有率高达96.42%;金矿物在0～2mm矿石综合样中以包裹金、粒间金为主,含少量裂隙金,其占有率分别为34.81%、34.73%和11.01%,并可见裸露连生金（19.39%）和微量单体金（0.06%）;金矿物粒度分布不均匀,粗粒金（＞74μm）、中粒金（74μm～37μm）、细粒金（37μm～10μm）、微粒金（＜10μm）的占有率分别为30.56%,12.96%,46.84%和9.64%;黄铁矿的嵌布粒度较粗,主要呈中粒—粗粒嵌布,易于解离,有利于浮选。研究结果表明,浮选富集黄铁矿等硫化物可以有效富集金矿物,对精矿再磨,有利于金的回收;同时应注意对粗粒金的回收。     

某铜镍多金属矿石工艺矿物学研究

某铜镍多金属矿床赋存于蚀变超基性岩镍矿床中,伴生铜、钴及贵金属铂、钯、金、银。通过显微镜观察,采用X射线衍射仪、扫描电镜能谱仪及矿物自动检测仪等分析技术,对该矿床的物质组成、目的矿物嵌布特征、有价元素平衡分配等工艺矿物学参数进行了系统的研究。结果表明,矿石中目的矿物主要为镍黄铁矿和黄铜矿,并含砷铂矿、锑铂矿、自然金、银金矿、自然银等多种贵金属矿物,具有重要的综合回收价值。矿石中的主要金属硫化物磁黄铁矿以粗中粒嵌布为主,镍黄铁矿与黄铜矿以细粒嵌布为主,三种硫化物主要呈集合体紧密连生,不易磨矿解离。在-0.075 mm占有率大于90%的磨矿细度下,目的矿物黄铜矿和镍黄铁矿的解离度均不及80%。采用浮选分别回收矿石中的黄铜矿和镍黄铁矿,预计铜和镍的理论回收率分别为86%和69%左右。为综合回收钴金属,可采取同时浮选镍黄铁矿和磁黄铁矿等硫化物的工艺,预计钴的理论回收率为69%左右,镍的理论回收率可提高至87%左右。此外,矿石中铂、钯、金、银等贵金属综合回收利用意义重大,应重视相关贵金属矿物的回收。     

某含金矿石的工艺矿物学研究

某含金矿石中有用矿物为自然金及银金矿,金品位为35g/t。为充分研究该矿石的工艺矿物学特性,通过化学分析、扫描电镜、X射线能谱仪、BPMA(北京矿冶研究总院开发的工艺矿物学参数自动测量系统)等分析手段,对矿石的化学成分、化学物相矿物组成、矿物嵌布特征、金的赋存状态、含金矿物的粒度、含金矿物解离度及影响金回收的矿物学因素等进行了系统研究。结果表明:矿石中金主要以自然金和银金矿形式存在,粒度以细粒金、微细粒金为主,分别占72.96%、27.04%;金矿物的嵌存状态以连生金为主,占65.11%,次为单体金,占31.06%,另有少量的包裹金和晶间金,分别占3.75%和0.08%;研究结果对矿石分选工艺流程的制定具有指导意义。     

某难选金矿物工艺矿物学研究

某金矿部分矿区属于蚀变型金矿,含金蚀变带系由花岗岩热液蚀变而发生的绢云母、硅化、黄铁矿化组成。矿体大部分赋存在黄铁绢云岩内,部分赋存在黄铁绢英岩化花岗岩内。利用光学显微镜、矿物分析系统（BPMA）、扫描电子显微镜及能谱对矿物进行工艺矿物学特性分析,分析发现矿石中以硫化矿为主,氧化带深度很浅。金品位5.23 g/t,主要金矿物有自然金、银金矿,主要金属矿物为黄铁矿、磁黄铁矿、方铅矿、黄铜矿、闪锌矿等硫化矿和磁铁矿等氧化矿物,脉石矿物主要有石英、绢云母、长石等。金的嵌布粒度较细,全部分布在37 μm以下,嵌布粒度较细。根据金矿物的赋存状态来看,以单体形式存在和与黄铁矿共生的含金矿物含量83.18%,这部分金矿物易于回收;与绢云母、石英和磁铁矿共生的含金矿物含量为16.82%,这部分是导致浮选过程中金回收率低的主要原因。      

广东某复杂难选难浸金矿工艺矿物学研究

针对广东某复杂难选金矿石进行了工艺矿物学研究。结果表明:该含金矿石中主要有价元素为金和银,还具有含碳、高砷、含泥量大的特性。原矿中金除了与黄铁矿等硫化物密切共生外,还有部分嵌布于石英等脉石矿物中,赋存状态复杂;矿石中金及载体矿物嵌布粒度均很细,属典型的难选难浸金矿石。结合工艺矿物学研究结果,本文还提出了该矿石开发利用的建议。     

云南某铜硫铁矿矿石工艺矿物学研究

为配合云南某铜、硫、铁多金属矿的矿石可选性试验,开展了该矿的工艺矿物学研究。结果显示,主要金属元素铜、铁、铋、金、银分别赋存于黄铜矿、磁铁矿、辉铋矿、银金矿等矿物中。矿石中的主要金属矿物磁铁矿含量较高,与其他金属硫化物矿物嵌布关系密切,且磁铁矿的嵌布粒度较粗,这对矿石的可选性影响较大。     

云南东川铜硫铁矿矿石工艺矿物学研究

为配合云南东川铜、硫、铁多金属矿的矿石可选性试验,开展了该矿的工艺矿物学研究。结果显示,主要金属元素铜、铁、铋、金、银分别赋存于黄铜矿、磁铁矿、辉铋矿、银金矿等矿物中。矿石中的主要金属矿物磁铁矿含量较高,与其他金属硫化物矿物嵌布关系密切,且磁铁矿的嵌布粒度较粗,这对矿石的可选性影响较大。     

云南某金多金属矿的工艺矿物学研究

为配合云南某多金属矿的矿石可选性试验,对该矿进行了详细的工艺矿物学研究。查明了矿石的矿物组成,重要矿物的赋存状态、嵌布特征、粒度组成、解离度特征以及影响选矿回收指标的矿物学因素等。研究表明,矿石中金、银矿物嵌布粒度细且与多种矿物共生密切,除了与黄铜矿、方铅矿、黄铁矿等硫化物共生外,还与磁铁矿、菱铁矿存在紧密嵌布关系,因此加强回收铁矿物中的金、银是提高回收率的关键。此外,黄铜矿、方铅矿和闪锌矿分别是铜、铅、锌回收的目标矿物,磁铁矿和菱铁矿是可综合回收的主要铁矿物。     

某含金矿石的BPMA自动工艺矿物学研究

某含金矿石中有用矿物为自然金及银金矿,金品位为35 g/t。为充分研究该矿石的工艺矿物学特性,通过扫描电镜、X射线能谱仪、BPMA软件系统等分析手段,对矿石的元素成分、物相矿物组成、矿物嵌布特征、金的赋存状态、含金矿物的粒度、含金矿物解离度及影响金回收的矿物学因素等进行了系统研究。结果表明:矿石中金主要以自然金和银金矿形式存在,粒度以细粒金、微细粒金为主,分别占72. 96%、27. 04%;金矿物的嵌存状态以连生金为主,占65. 11%,次为单体金,占31. 06%,另有少量的包裹金和晶间金,分别占3. 75%和0. 08%;研究结果对矿石分选工艺流程的制定具有指导意义。     

工艺矿物学自动分析仪(BPMA)在影响金氰化浸出的工艺矿物学因素研究中的应用

金的赋存状态和工艺矿物学特性是提高金回收率的根本因素。青海某氰渣浮选尾矿中金品位偏高,达3.2g/t,损失严重。为查明金损失原因,利用BPMA-SEM-EDS等手段对尾矿进行了深入的研究。结果表明：金矿物种类相对简单,主要为自然金,含少量银金矿;金矿物的嵌布粒度微细,绝大多数嵌布粒度在5微米以下;裸露金占有率15.26%,包裹金占有率84.11%且绝大多数被黄铁矿包裹;样品中存在少量砷酸盐类矿物,可能会影响金的浸出。提高磨矿细度和适当延长浸出时间,有利于金的浸出;通过浮选富集黄铁矿可以富集金,再进一步细磨,有利于金的进一步回收;重视脱除砷的影响,有利于提高金的浸出指标。     

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 materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

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.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

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.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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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