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。     

青海某金矿浮选尾矿工艺矿物学研究

青海某金矿石平均含金2.62 g/t、含砷0.28%,为典型的含砷难处理金矿。选矿厂采用"一次粗选、两次精选、两次扫选"浮选工艺,但金的回收率仅为77%左右,损失严重。为了查明金损失原因,提高选矿厂浮选回收率,利用化学多元素分析、光学显微镜、扫描电镜等工艺矿物学研究手段,对青海某金矿选矿厂浮选尾矿进行工艺矿物学研究。结果表明,浮选尾矿含金0.81 g/t,但金的赋存状态较为复杂,主要以极微细粒(粒度0.3~3μm)形式包裹于石英、方解石、钠长石等脉石矿物中,其次是以微细粒(粒度2~6μm)形式包裹于毒砂和斜方砷铁矿中,还可见部分金粒(粒度小于10μm)嵌布于脉石裂隙中。金嵌布粒度极细和包裹金所占比例较高,是选矿回收率不高的主要原因。     

基于工艺矿物学自动分析系统的微细粒金矿物量化表征

矿石中金的赋存状态和工艺矿物学特性是确定选冶工艺、提高金回收率的根本因素。采用工艺矿物学自动定量分析系统（BPMA）,结合扫描电镜-X射线能谱仪（SEM-EDS）,详细研究了胶东某蚀变岩型低品位（Au @1.1g/t）金矿石中微细粒金矿物的赋存状态及工艺矿物学特征。结果表明：矿石中金属硫化物主要为黄铁矿;脉石矿物主要为石英,其次为绢云母和钾长石。金矿物主要为银金矿、金银矿等金-银互化物,其平均成色为596.2‰;金矿物嵌布粒度细微,均在10μm以下;金的载体矿物种类较多,绝大多数金矿物与黄铁矿等金属硫化物嵌连;金矿物的嵌布状态主要为硫化物包裹金和裂隙金,含少量粒间金,其占有率分别为40.18%、39.75%和7.48%;通过浮选富集黄铁矿等硫化物并对粗精矿进行再磨,有利于提高金的回收率。BPMA-SEM-EDS自动、定量、可视化分析方法可以快速、高效、准确表征矿石中金的赋存状态和矿石工艺矿物学特性。     

某卡林型低品位难选金矿浮选试验

针对贵州某卡林型金矿原矿含金较低,金主要以超显微状态分布在硫化物、硅酸盐矿物和碳酸盐矿物中,金及其载体矿物嵌布粒度微细等问题,进行了工艺矿物学研究和试验室优化试验研究。试验最终得到了含金20.77 g/t、金回收率为59.99%的精矿1和含金6.73 g/t、金回收率为30.19%的精矿2,金总回收率达90.18%,尾矿金品位降至0.57 g/t的闭路试验结果;与现场选矿工艺制度相比,不仅减少了药剂生产成本,同时提高了金回收率,增加了经济效益,为卡林型难选低品位金矿的浮选提供了借鉴。     

焦家金矿工艺矿物学研究

研究结果表明 ,金的浮选指标取决于金矿物在黄铁矿、脉石中的分布率和金的载体矿物黄铁矿的嵌布粒度以及脉石中金矿物的粒度。矿石氧化使黄铁矿变成褐铁矿也会影响浮选效果 ;金矿物与黄铁矿的解离程度影响金回收率 ;正常氰化条件下 ,金精矿磨得愈细 ,氰化渣含金愈低。该研究成果为优化浮选、氰化工艺条件提供了依据     

某金矿工艺矿物学研究

对某金矿进行了工艺矿物学研究,重点研究了主要金属矿物及主要脉石矿物的产出形式及粒度特征.研究表明,该矿物为微细粒金矿,主要金矿物与脉石矿物之间嵌布关系复杂.根据工艺矿物学研究成果对选金工艺流程提出了建议,推荐采用浮选工艺.     

肃北某金矿浮选尾矿尼尔森重选实验

肃北某金矿选厂采用浮选工艺处理原矿石,近期由于原矿性质变化较大,金嵌布粒度变粗,造成选厂跑尾严重,尾矿金品位约为0.70~0.90 g/t。工艺矿物学研究表明其主要金属矿物为黄铁矿、黄铜矿,主要脉石矿物为石英、长石、高岭土等,矿物组成较复杂。从尾矿筛析结果来看,金主要以粗、中粒金为主,适宜采用尼尔森进行回收。在扩大重力倍数60 G、流态化水量3.2 L/min、给矿速度10 kg/h、原矿品位0.87 g/t的条件下,可以取得金精矿品位33.42 g/t,回收率35.27%的良好指标。      

老挝某含碳金矿工艺矿物学及处理工艺研究

以老挝某含碳金矿为研究对象,通过化学分析、X射线衍射及光学显微镜等手段对原矿进行了详细的工艺矿物学研究。分析结果表明,该矿含金2.97g/t,有机碳0.28%,硫0.8%,是典型含硫高碳难处理金矿。同时金属矿物以黄铁矿、毒砂、闪锌矿等金属矿物为主,脉石矿物以石英、斜长石、白（绢）云母、铁白云石为主,矿物成分较复杂。原矿中金绝大部分以自然金形式存在,且超过93%被其它物质包裹,主要嵌布于硫化矿物中。原矿中自然金粒度不均匀,-19μm+4.75μm粒级区间的自然金占比达到90.31%,未发现粗粒金。在工艺矿物学的基础上,提出“浮选-焙烧-浸出”处理工艺路线,经过浮选后得到的精金矿品位和回收率分别为29.21g/t,88.97%。浮选后的精金矿经过焙烧,直接浸出金的浸出率达到89.86%。 显著提高原矿中金的浸出率,为该类型金矿处理提供借鉴。     

辽宁某金矿石中金的重浮联选工艺流程研究

某金矿矿石中可回收的元素为金、银,且含量较高,有害元素较少。金属矿物多为硫化物,矿石中金的嵌布粒度不均匀,通过单一浮选与重浮联选对比试验研究,该矿石采用重浮联选回收金矿物选别指标较好,试验在原矿品位Au 19.56g/t条件下,重选获得精矿品位740.40g/t,金回收率61.70%;重选尾矿经浮选后精矿金品位106.5 g/t,金回收率33.92%,金合计回收率95.62%。为该金矿的合理开发提供了技术依据。     

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。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

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.     

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.     

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