中甸矿集区普朗-红山铜多金属成矿亚带北段帕纳牛场斑岩体^(40)Ar—^(39)Ar年龄及锑矿化

普朗-红山铜多金属成矿亚带北部帕纳牛场辉锑矿床与石英二长斑岩(热液)及断裂有关。斑岩黑云母40Ar-39Ar坪年龄和等时线年龄分别为199.1±1.3Ma和199.2±2.4Ma,代表了与辉锑矿化对应的斑岩的侵位时间,是该成矿亚带上目前获得石英二长斑岩中40Ar-39Ar最年轻的新年龄值,代表了义敦岛弧普朗-红山铜多金属成矿亚带存在燕山早期的构造-岩浆活动。在印支晚期主要形成斑岩型-夕卡岩型铜多金属矿床之外,燕山早期还具有斑岩及至少与斑岩有关的热液脉状成矿作用-锑矿化,预示了本区斑岩的一种新的成矿作用和找矿方向与前景。

湖南锡矿山锑矿床硅化作用与锑矿化关系

硅化作用是锡矿山锑矿床分布最广、强度最大、与锑矿化作用关系最密切的围岩蚀变。通过野外地质调查和室内研究表明,矿区内主要存在6种类型硅化岩石,它们是热液中硅质交代原岩为钙质岩石而形成的;硅化作用与锑矿化在时间和空间上具有密切的关系;石英的稀土元素配分模式显示热液中的硅质很可能来源于壳源花岗岩浆。同时对成矿溶液硅质、矿质的迁移、沉淀方式及矿化蚀变模式进行了探讨,该研究成果对分析锑矿形成过程及机制和找矿具有十分重要的意义。

新疆包古图Ⅲ-2号岩体锑矿化特征

报道了位于西准噶尔南部包古图地区Ⅲ-2号岩体东部边界的锑矿化.研究表明:锑矿化过程可划分为3个阶段:早期自然锑阶段,产出自然锑和磁黄铁矿的共生组合;中期硫锑铁矿阶段,硫锑铁矿与磁黄铁矿、黄铁矿和毒砂共生产出;晚期辉锑矿阶段,辉锑矿大量结晶,交代早期阶段自然锑和磁黄铁矿.矿物成分和相分析表明,早期阶段氧逸度的降低是导致自然锑沉淀的主要因素,晚期阶段温度降低导致辉锑矿大量沉淀.体系的硫逸度为-8^-13,从早期到晚期阶段,硫逸度明显上升.锑矿化的发现及研究补充完善了西准噶尔地区的矿产类型,具有理论意义及实践价值.

内蒙古额济纳旗黑大山锑矿化带化探异常特征及其找矿潜力评价

1∶20万区域化探工作在黑大山地区发现了规模较大的Sb、As为主的化探异常,经过异常查证工作,找到了2个锑矿化带。本区处于北山地区的锑矿成矿远景区,成矿地质条件十分有利,具有较大的找矿潜力。

内蒙古额济纳旗黑大山锑矿化带化探异常特征及其找矿潜力评价

在内蒙古额济纳旗黑大山地区地处北山锑矿成矿远景区,成矿地质条件十分有利,通过对该区开展区域化探工作,发现了规模较大的以Sb、As为主的综合化探异常,再辅以1:1万的地质、化探综合剖面测量及槽探工程揭露,找到2个锑矿化带(I号、II号矿化带)。对该区找矿潜力进行评价,认为该区具有较大的找矿潜力。

内蒙古黑大山锑矿化带找矿潜力评价

文章介绍了在黑大山地区进行1∶200000区域化探工作时发现了规模较大的锑(Sb)、砷(As)等元素的综合异常,分析了该异常区域地质、物探异常、遥感、影像特征,黑大山化探异常特征,并提出了异常查证方法,进一步评价了该地区的找矿潜力。

新疆巴音布鲁克西南一带水系沉积物测量地球化学特征及找矿方向

巴音布鲁克西南一带隶属于古亚洲构造成矿域天山-兴蒙成矿区带的西段,该区为我国重要的锑、铁、铜成矿带。为查明区内主要成矿元素地球化学分布和浓集特征,缩小找矿靶区,对巴音布克西南一带进行1∶5万水系沉积物地球化学测量。结合调查区成矿地质条件共圈定出14处综合异常,并对HS-2、HS-7综合异常进行了异常查证,在查汗沙拉锑矿北部新发现3条锑矿化体。圈定了3处找矿远景区,即查汗沙拉一带Sb-Pb-Zn-Cu找矿远景区、哈拉萨拉一带Fe-Cu找矿远景区、阿特达坂一带SbZn找矿远景区,为该区下一步找矿工作指明了方向。

新疆且末县屈库勒克东金锑矿床含矿性约束——来自蚀变矿物的研究证据

屈库勒克东金锑矿是塔里木板块、塔里木南缘活动带,哈拉米兰晚古生代沟弧带成矿作用的重大找矿突破,截止2017年年底已发现6条号金锑矿体,其中Ⅰ号金锑矿体是主矿体,估算锑、金资源量占屈库勒克东金锑矿锑、金总资源量的98.27%。为了查明屈库勒克金锑矿床矿物学特征与矿化之间的关系,以屈库勒克Ⅰ号金锑矿体为研究对象,根据蚀变矿物的产出状态展开研究,Ⅰ号金锑矿体的含矿岩体中发育着大量黄铁矿化、黄钾铁矾化、角砾岩化、绢英岩化等特征很好的指示了金锑矿化的形成。

云南维西格坡洛斑岩型锑矿矿床成因

锑矿化集中于喜马拉雅期石英斑岩内接触带,存在矿源层形成、充分分异及近地表成矿三个阶段。可作为滇西碱性岩锡矿床典型。

青海大场金矿床地质特征及成因探讨

青海大场金矿床位于北巴颜喀拉造山带的中段,为区域印支造山过程晚期Au-Sb成矿作用的产物。该矿床为具有层控性和受断裂构造、隐伏岩浆活动控制的金矿床。矿体主要呈脉状、似脉状和透镜状赋存于三叠系巴颜喀拉群砂岩板岩互层组内,并严格受断裂破碎带的控制。大场金矿床先后经历了金、锑2期矿化,矿化平均成矿深度分别为5.9km和6.9km,锑矿化深度略浅于金矿化。成矿流体总体属中温、较低盐度、低密度的CO2-H2O-N2-H2S-CH4±CO±有机碳氢化合物体系。该矿床与造山型金矿具有相似的地质地球化学特征,其金矿化属造山型金矿的中成矿化,其锑矿化为造山型金矿的浅成矿化。

皖南青阳-泾县地区中酸性脉岩锆石特征、U-Pb年龄及地质意义

文章在对皖南青阳-泾县地区与金-锑多金属矿化有关的中酸性脉岩进行系统调查的基础上,开展了锆石特征及U-Pb定年研究,识别出新生锆石、变质重结晶锆石、捕获锆石和继承锆石共4类锆石,并相应获得一系列年龄值。新生锆石和变质重结晶锆石年龄(125～124 Ma)代表中酸性脉岩形成时代,该年龄值与皖南地区燕山期晚阶段A型花岗岩(130～123 Ma)年龄基本一致,指示二者为同一期岩浆热事件的产物。微量元素特征显示中酸性脉岩源区存在石榴子石残留,而A型花岗岩源区存在斜长石残留,指示源区具双峰式岩浆组合特征,表明该时期皖南地区处于强烈的拉张构造背景下。捕获锆石给出148～142 Ma和136～132 Ma 2组年龄,对应于皖南燕山期早阶段和晚阶段早侵入岩的年龄,暗示脉岩出露区的深部存在隐伏的燕山早期岩浆岩,脉岩岩浆侵位过程中同化混染了早期岩浆岩。继承锆石给出的年龄与扬子板块地壳增生和再造事件中的3期模式增长的年龄相对应,反映与江南过渡带可能有相同的基底物质组成。中酸性脉岩中锆石具有较低的Ce4+/Ce3+比值,表明其岩浆结晶时具有相对低的氧逸度,有利于金、锑的硫化物的形成,进而发育金-锑矿化。区内多金属矿床(点)具有较为明显的分带性,近岩基的中酸性岩株及其接触带发育斑岩-矽卡岩型矿床,成矿元素以钨、钼、铜为主;远离岩基的岩枝或岩脉状中酸性脉岩中及旁侧断裂带内发育脉状矿化,成矿元素以金、银、锑为主,显示出区域成矿作用受断裂构造系统、岩浆活动期次和成矿元素活动性的共同制约。

Electrochemical behavior of galena and jamesonite flotation in high alkaline pulp

In order to effectively separate galena and jamesonite and improve the recovery during the mixing flotation, the interaction mechanisms between the minerals and the collector of diethyl dithiocarbamate （DDTC） were investigated. Single mineral flotation test was organized to research the effect of pulp pH value on the flotation behavior of galena and jamesonite. Electrochemistry property of the interaction of these two minerals with DDTC was investigated by cyclic voltammetry and Tafel tests. Flotation test shows that the recovery of jamesonite in high alkaline pulp is strongly depressed by lime （Ca（OH）2）. The cyclic voltammetry and Tafel tests results show that the interaction between galena and DDTC is an electrochemical process. High pH value has little influence on the interaction between galena and DDTC, while it has great effect on jamesonite due to self-oxidation and specific adsorption of OH^- and CaOH^＋ on jamesonite surface. Non-electroactive hydroxyl compound and low-electroconductive calcium compounds cover the surface of jamesonite, which impedes electron transfer and DDTC adsorption, thus leads to very low floatability of jamesonite.

黔西南雄武背斜地区找矿远景浅析——以小补衣金矿勘查区为例

雄武背斜地区金矿床(点)有较好的找矿标志;物探测量显示二叠系中统四大寨组(P_2sd)及其之下存在隐伏断裂构造,经钻探验证发育于P_2sd的内断层破碎带硅化角砾岩中,见金矿化、雄雌黄化、锑矿化;用黔西南金矿的两层楼成矿模式找矿,是今后雄武背斜地区的找矿方向。

Application of reflux classifier with closely spaced inclined channels in pre-concentrate process of fine antimony oxide particles

In this work,the reflux classifier with closely spaced inclined channels is used as the pre-concentration facility to improve the separation efficiency before the shaking table separation.Three operating parameters of reflux classifier(RC)to pre-concentrate fine(0.023−0.15 mm)tailings of antimony oxide were optimized by response surface methodology(RSM)using a three-level Box-Behnken design(BBD).The parameters studied for the optimization were feeding speed,underflow,and ascending water speed.Second-order response functions were produced for the Sb grade and recovery rate of the concentrate.Taking advantage of the quadratic programming,when the factors of feeding,underflow and ascending water are respectively 225,30 and 133 cm^3/min,a better result can be achieved for the concentrate grade of 2.31% and recovery rate of 83.17%.At the same time,70.48% of the tailings with the grade of 0.20% were discarded out of the feeding.The results indicated that the reflux classifier has a good performance in dealing with fine tailings of antimony oxide.Moreover,second-order polynomial equations,ANOVA,and three-dimensional surface plots were developed to evaluate the effects of each parameter on Sb grade and recovery rate of the concentrate.

Sodium sulfide leaching of low-grade jamesonite concentrate in production of sodium pyroantimoniate

Sodium sulfide leaching of a low-grade jamesonite concentrate in the production of sodium pyroantimoniate through the air oxidation process and the influencing factors on the leaching rate of antimony were investigated. In order to decrease the consumption of sodium sulfide and increase the concentration of antimony in the leaching solution, two-stage leaching of jamesonite concentrate and combination leaching of high-grade stibnite concentrate and jamesonite concentrate were used. The experimental results show that the consumptions of sodium sulfide for the two-stage leaching process and the combination leaching process are decreased by 20% and 60% compared to those of one-stage leaching process respectively. The final concentrations of antimony in the leaching solutions of both processes are above 100g/L.

Effect of Fe/SiO2 and CaO/SiO2 mass ratios on metal recovery rate and metal content in slag in oxygen-enriched direct smelting of jamesonite concentrate

The oxygen-enriched direct smelting of jamesonite concentrate was carried out at 1250℃by changing the slag composition.The effects of Fe/SiO2 and Ca O/SiO2 mass ratios on the metal recovery rate as well as metal content in slag were investigated.Experimental results indicated that the metal(Pb+Sb)recovery rate was up to 88.30%,and metal(Pb+Sb)content in slag was below 1 wt.%under the condition of slag composition of 21-22 wt.%Fe,19-20 wt.%SiO2 and 17-18 wt.%Ca O with Fe/SiO2 mass ratio of 1.1:1 and Ca O/SiO2 mass ratio of 0.9:1.The microanalysis of the alloy and slag demonstrated that the main phases in the alloy contained metallic Pb,metallic Sb and a small amount of Cu2 Sb and Fe Sb2 intermetallic compounds.The slag was mainly composed of kirschsteinite and fayalite.Zinc in the raw material was mainly oxidized into the slag phase in the form of zinc oxide.

Mechanism of stibnite volatilization at high temperature

The volatilization of stibnite(Sb2S3) in nitrogen from 700 to 1000 °C was investigated by using thermogravimetric analysis. The results indicate that in inert atmosphere, stibnite can be volatilized most efficiently as Sb2S3(g) at a linear rate below850 °C, with activation energy of 137.18 k J/mol, and the reaction rate constant can be expressed as k=206901exp(-16.5/T). Stibnite can be decomposed into Sb and sulfur at temperature above 850 °C in a nitrogen atmosphere. However, in the presence of oxygen,stibnite is oxidized into Sb and SO2 gas at high temperature. Otherwise, Sb is oxidized quickly into antimony oxides such as Sb2O3 and Sb O2, while Sb2O3 can be volatilized efficiently at high temperature.

Leaching kinetics of antimony-bearing complex sulfides ore in hydrochloric acid solution with ozone

The leaching kinetics of Sb and Fe from antimony-bearing complex sulfides ore was investigated in HCl solution by oxidation?leaching with ozone.The effects of temperature,HCl concentration,stirring speed and particle size on the process were explored.It is found that the recoveries of Sb and Fe reach86.1%and28.8%,respectively,when the reaction conditions are4.0mol/L HCl,900r/min stirring speed at85°C with<0.074mm particle size after50min leaching.XRD analysis indicates that no new solid product forms in the leaching residue and the leaching process can be described by shrinking core model.The leaching of Sb corresponds to diffusion-controlled model at low temperature(15?45°C)and mixed-controlled model at high temperature(45?85°C),and the apparent activation energies are6.91and17.93kJ/mol,respectively.The leaching of Fe corresponds to diffusion-controlled model,and the apparent activation energy is1.99kJ/mol.Three semi-empirical rate equations are obtained to describe the leaching process.

Modelling and process optimisation of antimony removal from a complex copper concentrate

The modelling and optimization for the alkaline sulphide leaching of a complex copper concentrate containing 1.69% Sb and 0.14% Sn were studied.Response surface methodology,in combination with central composite face-centred design（RSM-CCF）,was used to optimise the operating parameters.The leaching temperature,sulphide ion concentration and solid concentration were chosen as the variables,and the response parameters were antimony and tin recovery,and the time required to achieve 90% Sb dissolution.It was confirmed that the leaching process was strongly dependent on the reaction temperature as well as the sulphide ion concentration without any significant dependence on the solid concentration.Furthermore,a mathematical model was constructed to characterise the leaching behaviour.The results from the model allow identification of the most favourable leaching conditions.The model was validated experimentally,and the results show that the model is reliable and accurate in predicting the leaching process.

Getting and X-Ray Diffraction Analysis of the Uranium Catalyst SAPO-U, Nd, Sb, Bi on the Basis of Natural Zeolite Deposits Chankanayskoe

To study the physical and chemical properties of uranium catalyst by impregnation and calcination us was first obtained uranium catalyst SAPO-U, Nd, Sb, Bi. The method of X-ray structure has been studied of the uranium catalyst SAPO-U, Nd, Sb, Bi.