赣南隆坪萤石矿床成矿流体特征及成矿模式探讨

赣南兴国县隆坪大型萤石矿床位于大余 南城深大断裂西侧兴国 宁都萤石成矿带内，呈板状、似层状、脉状产于永丰复式岩体外接触带北东向硅化破碎带中。本文划分了兴国县隆坪萤石矿床的成矿阶段，通过流体包裹体岩相学、显微测温、激光拉曼成分分析和H O同位素研究，讨论了该矿床成矿流体性质、来源、演化与成矿模式。根据矿物穿插关系和矿相学特征，将隆坪萤石矿床划分为3个成矿阶段，即成矿早阶段(萤石 石英阶段)、成矿主阶段(石英 萤石阶段)和成矿晚阶段(萤石 方解石阶段)。流体包裹体类型主要为富液相两相包裹体，均一温度变化范围在111~374℃之间，盐度变化于0. 53%~3. 55%NaCleq之间 ，密度变化于0. 58~1. 02 g/cm3之间。包裹体成分以H2O为主。总体而言，成矿流体属于中低温、中低盐度、中低密度的NaCl H2O体系，但成矿早阶段存在高温、相对高盐度的流体端元(温度大于300℃，盐度为2. 0%~2. 7%NaCleq)，推断永丰复式岩体晚阶段岩浆热液参与早阶段萤石成矿作用，提供F的来源和热源。隆坪萤石矿床流体包裹体中的δDV SMOW和δ18OV SMOW值均较低，分别为-66. 8‰~-53. 1‰(平均值为-59. 5‰)和-5. 9‰~-3. 3‰ (平均值为-4. 6‰)，成矿流体主要来源于大气降水和地热水。成矿早阶段萤石沉淀机制主要为岩浆热液和大气降水混合与水 岩反应，而流体冷却作用是成矿主阶段和晚阶段萤石沉淀的主要机制。隆坪萤石矿床属断裂控矿、中低温热液裂隙充填型萤石矿床。     

Effect of oxidation potential and zinc sulphate on the separation of chalcopyrite from pyrite

The effects of oxidation potential (Eh) and zinc sulphate on the separation of chalcopyrite from pyrite were investigated at pH 9.0. The flotation recovery of these minerals is Eh dependent with maximum separation obtained at 275 mV SHE. Zinc sulphate addition improved this mineral separation at an Eh value of 275 mV by selectively depressing pyrite flotation. A different result was obtained at lower Eh values where zinc sulphate addition improved chalcopyrite flotation but had no or little effect on pyrite flotation. These opposite effects of zinc sulphate on mineral flotation were reconciled by examining the surface species of these minerals. The selective depression of pyrite flotation by zinc sulphate was also confirmed in the flotation of two copper ores.     

Evaluation of multiphase flotation models in grid turbulence via Particle Image Velocimetry

Industrial processes involving multi-phase flows such as flotation require understanding of the relationships between bubbles, solid particles and the flow. Modern experimental tools are employed in this effort to measure with great accuracy the basic features of the motion of all three phases in turbulent flow. We employed a unique Digital Particle Image Velocimeter (DPIV) that can record with great accuracy and kHz temporal resolution, velocity vectors of all three phases, namely the fluid, the solid particles and the air bubbles. The interaction of these three phases was studied in homogeneous isotropic turbulence generated by cylindrical grids. Particles and bubbles were released into the turbulence and the motions of the three phases were monitored. The experimental results obtained in the present work were compared with the predictions of the models published in the literature.     

庚村和黄双岭萤石矿同位素地球化学特征

文章详细研究庚村和黄双岭萤石矿的同位素分析结果,得出如下主要结论;成矿溶液来源于当地中生代大气降水：Ｓｒ,Ｂａ,Ｃａ来源于强蚀变的围岩;矿液中存在有ＨＦ和ＳｉＦ４;成矿过程氢,硫同位素出现交换动力学效应,庚村和黄双岭萤石矿的成矿年龄分别接近８４Ｍａ和１０７Ｍａ。     

新类型金矿—萤石型金矿的矿石学研究

浙东南萤石型金矿赋存于萤石矿田中，是一个受陈蔡群层位控制的新类型金矿。矿石中金属最高含量为５４×１０＾－６，一般５×１０＾－６－２５×１０＾－６，主要工业矿物的银金矿。成矿有多期次的特性。矿石中还含Ｓｅ．     

德安县金家洞萤石矿床地质特征

金家洞萤石矿位于彭山背斜构造北西翼,萤石矿体赋存于中奥陶统汤山组的硅化破碎带内。受区域北东-南西向断裂构造控制,矿体具中等规模,埋藏浅、质量好。矿石类型以纯萤石型、石英-萤石型、硅化灰岩-萤石型为主,次为方解石-萤石型、方解石-石英-萤石型。矿床成因属岩浆期后低温热液充填交代型矿床,成矿作用与燕山期岩浆活动密切相关。     

萤石颜色与自由基关系的电子自族共振（ESR）研究

萤石颜色与自由基关系的电子自族共振（ＥＳＲ）研究唐荣炳，温桂兰（中国科学院地球化学研究所，贵阳５５０００２）（中国科学院广州地球化学研究所，广州５１０６４０）关键词萤石，顺磁离子，自由基长期以来，对矿物颜色的研究，先是定性观察和分类，再是应用光的吸收...     

用浮选法分离萤石的探讨

本文简略地叙述了萤石的物理特性及共生矿物组合。根据萤石的物理化学性质,选择了对萤石的分选方法,并着重分析了用重选和浮选法分离萤石的技术方案比较,确认用浮选法分离萤石是有效的方法之一,因而对用浮选法分离萤石进行了一系列的不同药剂种类和用量试验,并选择了对萤石富集比较有效的药剂对某铁矿中微细萤石的浮选富集和提纯,结果采用粗选与精选相结合的提纯流程,可以达到预想的目的,萤石的纯度可达97%左右。     

尾矿中绢云母回收试验研究

经对尾矿中绢云母试验研究，确定尾矿中回收绢云母的工艺采用先粗选后浮选的方法，同时加入捕收剂BK，抑制剂B—1和B—2，使绢云母的纯度达到98％，尾矿中绢云母产出率为6％。     

Study of celestite flotation efficiency using sodium dodecyl sulfonate collector: factorial experiment and statistical analysis of data

Flotation tests of synthetic mixtures of celestite (SrSO₄) and calcite (CaCO₃) minerals using sodium dodecyl sulfonate as collector were carried out using a factorial experimental design 2³. The independent experimental variables included celestite grade in the feed (50% and 90% SrSO₄), conditioning pH (6.5 and 9) and sodium silicate depressant concentration (10⁻⁵ and 10⁻³ M). All experiments were performed at a constant collector concentration (10⁻⁴ M) and conditioning time of 15 min. The response variables were recovery and grade of SrSO₄ in the concentrate.The factors that had the greatest effect on the grade and recovery of celestite were the celestite grade in the feed (L) and the depressant concentration (C); also the combination of these factors significantly affected the response variables. The highest celestite yield (96% recovery, 98% grade) was obtained when a 90% of celestite grade in the feed was used.