共查询到18条相似文献，搜索用时 109 毫秒
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云南省丘北县大铁中型铝土矿是近年来在滇东南地区新发现并探明的一水硬铝石沉积型铝土矿床,矿体赋存于上二叠统龙潭组下段。通过矿相学分析,对大铁铝土矿矿石的矿物组成和主要矿物的赋存状态进行了系统研究。研究结果表明,矿石主要矿物组成为一水硬铝石,其次是高岭石、伊利石、绢云母、绿泥石、锐钛矿、赤铁矿、针铁矿、金红石、玉髓等。一水硬铝石呈现出多种结晶形态和复杂的赋存状态,其嵌布特征主要有以下5种：①呈自形、半自形粒状不均匀地嵌布在脉石矿物中;②呈豆状、土豆状、豆鲕状产出;③呈隐晶质、微晶集合体或极不规则的粒状、微粒状产出;④呈脉状、骸晶状产出;⑤一水硬铝石与铝凝胶或脉石矿物的集合体呈环带状或同心圆状产出。 相似文献
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采用XRF、XRD、AMICS、EPMA等多种测试手段,对贵州某地锰矿矿石进行了系统的工艺矿物学研究,包括化学成分分析、矿物组成及含量分析、主要元素的赋存状态研究、主要矿物的嵌布特征和嵌布粒度研究。矿物含量研究在XRD和AMICS半定量分析基础上,通过使用XRF和EPMA校正数据,提高数据的准确性。研究表明,该矿石为低品位中高铁高磷酸性锰矿石,矿石中有用矿物为钙菱锰矿,主要脉石矿物为锰白云石、锰菱铁矿、伊利石、石英、钠长石、黄铁矿及磷灰石。代表性样品w(Mn O)为18.74%,其主要赋存于钙菱锰矿中。钙菱锰矿的百分含量为38.71%,95.00%的Mn赋存其中。钙菱锰矿嵌布粒度主要集中在37.50～178.38μm区间,而脉石矿物的嵌布粒度主要集中在0.83～37.50μm区间。 相似文献
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为了查明四川瓦基铜矿矿石性质,制定合理选冶方案。采用X射线荧光光谱仪(XRF)、化学分析、X射线衍射分析仪(XRD)和光学显微镜等现代分析测试技术研究矿石元素质量分数、矿物组成、主要矿物嵌布特征及嵌布粒度等。结果表明,矿石中主要有价元素为铜,品位为0.84%,伴生元素金品位为0.29×10~(-6)、银品位为7.93×10~(-6),主要金属矿物为黄铁矿和辉铜矿,次要金属矿物有黄铜矿、斑铜矿、蓝辉铜矿、孔雀石、铜蓝和赤铁矿等,属氧化率较低的混合铜矿。脉石矿物主要为石英、白云石、长石和方解石等,含铜矿物嵌布粒度细,大部分嵌布在脉石矿物孔隙处、边缘及表面,呈隐晶质集合体形态。针对矿石性质,采用硫化浮选,经过"一粗一精三扫"闭路流程选别,获得铜精矿产率3.34%、铜品位为21.61%、回收率为85.93%的结果,与现场生产指标相比,铜回收率提高了5.49%。 相似文献
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西北某矿石属低硫含磷的酸性低品位原生钒钛磁铁矿矿石,通过镜下鉴定、X射线衍射分析和扫描电镜分析等多种手段对原矿的化学成分、矿物组成及含量、矿物的产出形式、矿石的结构构造、主要目的矿物的嵌布粒度等进行了详细的工艺矿物学研究,查明矿石的工艺学特性.研究结果表明,该矿石具浸染状构造和交代构造,其中铁矿物主要是钛磁铁矿和赤铁矿,钛矿物包括钛铁矿、金红石和榍石等.钛磁铁矿和钛铁矿均属不均匀细粒—微细粒嵌布特征,在-400目占95%左右的磨矿细度条件下,通过选矿可获得铁精矿和钛精矿两种产品. 相似文献
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湖北省南漳县震旦系沉积型红星磷矿矿体P_2O_5平均含量23.91%,矿石自然类型主要为角砾状磷块岩,其次为白云质磷块岩、泥质纹层状和条带状致密块状磷块岩。工业类型主要为钙(镁)质和硅钙(镁)质磷矿,其次为硅质磷矿。矿石矿物为胶状磷灰石和微晶磷灰石,经x-射线衍射物相分析,其种属为含碳氟磷灰石。嵌布粒度以细-中粒为主。脉石矿物主要为白云石、伊利石、高岭石、铁质。经测定当磷块岩磨矿粒度小于0.1mm,其磷酸盐矿物单体解离率可达92.53％,这为确定合理的选矿流程具有实际意义。 相似文献
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芦子园铅锌矿是近年来新发现的大型铅锌多金属矿床。已发现20多种矿物,金属矿物以闪锌矿、方铅矿、黄铜矿为主,脉石矿物以蔷薇辉石、方解石、石英等为主,脉石矿物总量高达89.04%。通过原矿X射线荧光光谱半定量分析、物相分析及扫描电镜分析等,综合分析原矿性质、矿物组成、有益元素赋存状态与主要矿物嵌布特征。结果显示,矿石中有益元素铜赋存在黄铜矿和黝铜矿及斑铜矿中,铅主要赋存在方铅矿中,锌主要赋存在闪锌矿中。矿石中大部分金属硫化物呈它形不规则状集合体,黄铜矿与方铅矿、闪锌矿等金属硫化物密切共生。闪锌矿与方铅矿、黄铜矿与闪锌矿等的嵌布关系非常复杂,边界极不规则,且常常相互包裹,矿物工艺粒度较细,单体解离困难。闪锌矿中可见固溶体分离结构的细小粒状黄铜矿嵌布,这种形式嵌布的黄铜矿一般无法解离。 相似文献
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金川低品位镍矿石工艺矿物学特性研究 总被引：2，自引：1，他引：1
金川低品位镍矿石属发生较强烈氧化的难处理型镍资源,矿石中镍的品位为0.51%,主要以紫硫镍矿形式存在。紫硫镍矿由磁黄铁矿、黄铁矿蚀变而来,呈现铁高、硫低、镍低的特点,选矿中可浮性较差。主要矿物的工艺嵌布粒度统计分析表明,矿石中镍矿物和黄铜矿均属微细粒嵌布的范畴,磁铁矿则具不均匀细粒嵌布的特点。单纯从粒度分布特征来看,选矿中欲使90%以上的镍矿物获得解离,以选择-0.026 mm的磨矿细度较为适宜,此时-600目部分约占95%左右。与磁铁矿嵌连关系密切的紫硫镍矿占其总量的95%以上,选矿过程中要提高镍的回收率,必须尽可能多地回收磁铁矿。矿石中脉石矿物主要为蛇纹石与绿泥石,易泥化,减少和消除脉石矿物对选别的影响至关重要。 相似文献
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以电子探针(EPMA)为主要研究手段,结合常规化学分析、化学物相分析、透反射显微镜研究,对黔西北某地低品位铁矿中铁—钛的赋存状态进行了详细研究。研究结果表明,矿石中铁主要以褐铁矿形式存在,少量以赤铁矿产出。载铁矿物与粘土矿物常常混杂出现,分布不均,团块大小差异也大,矿物间的嵌布关系复杂;钛在矿石中一是以微细粒的独立矿物金红石、锐钛矿、钛铁矿与脉石矿物相互混杂分布,另一种则是蚀变残留于褐铁矿中类质同象的钛。根据铁、钛赋存特征研究结果,对该矿石提出了"分散—絮凝—磁选"分离预富集铁—钛矿物、"直接还原法"实现铁钛分离的工艺建议。 相似文献
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通过化学分析、扫描电镜以及工艺矿物学自动定量分析系统(MLA)等测试方法对河南嵩县下蒿坪金矿进行了系统的工艺矿物学研究,包括原矿化学组成、矿物组成、金的赋存状态、主要载金矿物嵌布特征以及矿物解离特性等。结果表明,该金矿中主要可回收的有价金属为金,其品位为3.75×10-6。该金矿的原矿矿物主要由石英、钾长石、钠长石、黄铁矿和铁白云石组成,此外还有少量的赤铁矿、萤石、白云石以及方解石。原矿中的金主要赋存在黄铁矿中,而黄铁矿大部分以细粒、微细粒形式嵌布在石英和长石颗粒中。原矿中自然金的含量非常少,多以单独的自然金颗粒形式存在。原矿磨至P80=0.074 mm(-0.074 mm粒级含量占80%)时载金矿物黄铁矿、方铅矿、闪锌矿的单体解离度相对较高,有利于通过浮选回收。 相似文献
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The main objective of this experimental study was to investigate the evolution of the mineral liberation characteristics of an ore undergoing grinding. Six samples of an iron ore containing hematite, magnetite and quartz have been tested. Mineral grade and liberation measurements have been performed with an image analyser on polished sections of particles from several discrete size intervals.For each product, the grade in iron oxides was increasing greatly with the fineness of the particles. Moreover, in each size interval down to 270 mesh, it was slightly decreasing as grinding proceeded. These behaviors are due to the fact that iron oxides were ground more easily than the siliceous gangue. The degree of liberation of the valuable minerals was evidently increasing with the particle fineness. Moreover, for each size interval coarser than 48 mesh, it has also shown a slight decrease with grinding. For finer sizes however, it appeared in practice invariant and independent of the grade or of the degree of grinding. These observations are of interest when considering that the grinding products tested were very different in fineness while corresponding to various modes of fragmentation.(jaw crushing, roll crushing and ball milling) and to an ore with a high tendency to break along the mineral grain boundaries. 相似文献
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鞍钢弓长岭三矿区三种矿石类型的工艺矿物学研究 总被引：1，自引：0，他引：1
１ 矿石的物质组成１－１ 矿石的化学成分及矿物组成三矿区矿石的化学成分较简单,碱性系数很低,在０－０３％以下;矿石为高硅、贫铁,低ＣａＯ、ＭｇＯ、Ａｌ２Ｏ３,且有害杂质ＳＯ２、Ｐ２Ｏ５含量低于工业允许值（０－５％）的酸性矿石。随着矿石中ＦｅＯ含量的降低,ＣａＯ、ＭｇＯ、Ｋ２Ｏ含量有依次降低的趋势,Ｐ２Ｏ５及ＣＯ２也随ＦｅＯ降低而逐渐降低。矿石的矿物成分以赤铁矿、磁铁矿和石英为主,其它矿物成分很少,矿石类型不同,主要矿物含量也有差异。根据矿石的化学全分析及电子探针分析结果计算的矿石定量组成见表１。… 相似文献
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Geology and geochemistry of the Águas Claras and Pico Iron Mines, Quadrilátero Ferrífero, Minas Gerais, Brazil 总被引：1，自引：0，他引：1
Carlos Alberto Spier Sonia Maria Barros de Oliveira Carlos Alberto Rosière 《Mineralium Deposita》2003,38(6):751-774
The Águas Claras and Pico Mines are two world-class iron-ore mines hosted within the Lower- Proterozoic banded iron-formations (locally known as itabirites) of the Minas Supergroup located in the Quadrilátero Ferrífero district, Minas Gerais, Brazil. The Águas Claras orebody consists of a 2,500-m-long roughly tabular-shaped lens hosted within the dolomitic itabirite of the Cauê Formation. Dolomitic itabirite is the protore of the soft high-grade iron ore, which is the main ore type of the Águas Claras orebody, representing about 85% of the 284 Mt mined since 1973, with the remaining 15% comprising hard high-grade ore. Hematite is the main constituent of the iron ores. It occurs as martite, granular hematite and locally as specularite. Magnetite appears subordinately as relicts within martite and hematite crystals. Gangue minerals are very rare. These consist of dolomite, chlorite, talc, and apatite, and are especially common in contact with the protore. This virtual absence of gangue minerals is reflected in the chemistry of ores that are characterized by very high Fe contents (an average of 68.2% Fe).The Pico orebody is a continuous ~3,000-m-long body of a lenticular shape hosted within siliceous itabirite, which is the protore of the soft high- and low-grade ores at the Pico Mine. The soft high-grade ores, together with the low-grade ores, called iron-rich itabirite, are the main types of ore, and respectively represent approximately 51 and 29% of the reserves. The remaining 20% consists of hard high-grade ore. The iron oxide mineralogy is the same as that of the Águas Claras Mine, but in different proportions. Gangue minerals are very rare in the high-grade ores, but are slightly more common in the iron-rich itabirite. Quartz is the dominant gangue mineral, and is found with minor quantities of chlorite. The chemistry of the high-grade ores is characterized by high Fe contents (an average of 67.0%) and low P, Al2O3, and SiO2, which are concentrated in the fines. Iron-rich itabirites average 58.6% Fe and 13.5% SiO2.The genesis of the soft high-grade ores and iron-rich itabirites is related to supergene processes. Leaching of the gangue minerals by groundwater promoted the residual iron enrichment of the itabirites. This process was favored by the tropical climate and topographic situation. The original composition of the itabirites and the presence of structures controlling the circulation of the groundwater have influenced the degree of iron enrichment. The hard high-grade ores are of a hypogene origin. Their genesis is attributed to hydrothermal solutions that leached the gangue minerals and filled the spaces with hematite. This process remains a source of debate and is not yet fully understood.Editorial handling: S.G. Hagemann 相似文献
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鄂西高磷鲕状赤铁矿原矿全铁品位47.56%,含P 0.93%,主要脉石矿物为绿泥石、磷灰石、石英、方解石、铁白云石,属难选铁矿石。通过磁化焙烧-磨矿-磁选优化工艺,最佳磁化焙烧条件为:焙烧温度800℃、焙烧时间90min、还原剂用量12%,焙烧矿磨矿细度-0.074mm占85.15%,经弱磁选可得到全铁品位为58.13%、磷含量0.70%,铁回收率为90.41%的粗精矿。对磁化焙烧-磁选过程的各产物组成分析表明,焙烧矿和粗精矿中主要矿物为磁铁矿,占比分别为65%和85%;主要脉石矿物为绿泥石、磷灰石、石英、铁白云石等。粗精矿矿物的嵌布粒度较细,-0.074mm粒级占85.15%,但部分矿物仍以相互浸染、包裹、鲕状碎屑、连晶等形式存在,矿物仍未完全单体解离,从而导致粗精矿中杂质磷、铝等含量较高。粗精矿细磨后粒度-0.022mm含量为80%时,磁铁矿的解离度为84.63%,可实现磁铁矿充分单体解离,经过深选可提高铁精矿质量。 相似文献
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西藏仲巴县天公尼勒铜金矿床为一小而富的铜金矿床，矿化体赋存于早白垩世闪长岩体外接触带NE—NNE向断裂及其层间破碎带中，控矿岩体的外接触带发育的NW向韧脆性剪切断裂带控制着矿区断裂系统，已知的铜金矿体特征相似，均产于灰黑色结晶灰岩与灰白色大理岩接触部位的断裂破碎带和层间破碎带中；矿石矿物主要有黄铜矿、蓝铜矿、孔雀石、辉铜矿、黄铁矿、赤铁矿、褐铁矿等，脉石矿物为石英、方解石和绿帘石等；成矿经历了岩浆热液期（包括中高温热液阶段和中温热液阶段）和次生氧化期；早白垩世石英闪长岩的侵入、NW—NNE向断裂和层间破碎带是成矿的主要控制因素；矿床的成因类型为岩浆热液交代充填型矿床，其工业类型为构造破碎带蚀变岩型矿床。 相似文献