湖北宜昌×××条带状磷块岩选矿试验研究

×××磷矿属海相沉积型磷块岩矿床,主要具有胶状泥晶结构和磷质砂屑结构,以条带状构造为主。采用单一反浮选选矿工艺,使用硫酸为抑制剂、中化地质矿山总局地质研究院研制的K-02为捕收剂,在常温条件下取得较好的选矿工艺指标。进行了实验室重液浮沉试验。     

内蒙×××蓝晶石矿可选性试验研究

对内蒙×××蓝晶石矿采用脱泥-碱性介质浮选-磁选和脱泥-磁选-酸性介质浮选两种工艺流程进行可选性试验研究。结果表明,酸性介质浮选的分选效率和选择性较好。该矿采用脱泥-磁选-酸性介质浮选工艺流程,获得了较好的试验指标。     

浙江萤石矿床的稀土元素地球化学特征木

文章根据浙江14个萤石矿床(点)的94个萤石和49个赋矿岩石样品的稀土元素分布特征,将萤石矿床分为两种类型:即轻稀土富集型(萤石的∑REE=30×10~(-6)～80×10~(-6),Y=10×10~(-6)～50×10~(-6),∑Ce/∑Y≥1,La/Yb>6);重稀土富集型(萤石的∑REE=40×10~(-6)～70×10~(-6),Y=30×10~(-6)～110×10~(-6),∑Ce/∑Y<1,La/Yb<3)。前者从早阶段到晚阶段,萤石的∑REE及Y含量趋于减小,LREE/HREE及La/Yb值增大;后者从早期到晚期,萤石的∑REE和Y含量以及LREE/HREE和La/Yb比值变化则相反。轻稀土富集型萤石的矿床规模越大,萤石与未蚀变围岩的REE含量差值越大;重稀土富集型萤石的矿床规模越大,萤石与未蚀变围岩的REE含量差值越小。     

“曲化平”方法在吉林×××矿区的应用和效果

一、前言 M_4低缓异常(图1),是吉林冶金地质公司608队在1981年做地面磁法普查时发现的。该异常位于吉林省南部×××铁矿西南四公里处,处于老岭背斜南东翼隆起部位。异常区内地层主要是震旦系大罗圈河组,不整合覆盖于老岭群大栗子组之上,厚度约300—500米。×××组地层呈一些小天窗零星出露于沟谷之中。测区的西南角和东北角有少量的中生界侏罗系一白垩系地层分布,不整合(构造不整合)于大罗圈河组地层之上。×××铁矿位于该区的东北部。××××铁矿赋存于大栗子组含铁层中,矿体上盘为千     

江西宁都坎田萤石矿床稀土元素地球化学特征及其指示意义

赣南地区萤石资源丰富, 坎田萤石矿位于赣南地区的兴国—宁都萤石成矿带上, 矿体赋存于晚侏罗世黑云母花岗岩内。本文结合研究区的区域地质背景, 对江西宁都坎田萤石矿床的萤石及围岩进行了稀土元素地球化学特征研究, 以探讨坎田萤石矿床的成矿流体来源和矿床成因。其研究结果表明, 萤石的稀土元素总量为34.11×10–6~78.12×10–6, 属于轻稀土富集型, 稀土元素配分曲线形态基本一致; 围岩的稀土元素总量为94.14×10–6~175.72×10–6, 其配分模式与萤石具有相似同步性, 且萤石与围岩具有相近的Sm/Nd比值, 均表明萤石的成矿流体来源与围岩密切相关。结合前人在赣南地区对萤石气液包裹体进行氢氧同位素特征的研究, 认为成矿流体主要来源于大气降水, 成矿物质Ca和F元素主要来自于大气降水对燕山早期的黑云母花岗岩的淋滤和萃取。通过研究区的地质背景、萤石的强烈负Eu异常特征以及Tb/Ca-Tb/La关系图, 认为研究区萤石矿属于还原环境下的中低温热液充填型萤石矿床。     

内蒙古东七一山萤石矿床的稀土元素地球化学特征及成因

运用等离子质谱和等离子体光谱对内蒙古东七一山萤石矿的萤石矿石和围岩样品的稀土元素进行了系统分析.结果表明,矿石的∑REE<30×10-6,LREE为5×10-6～15×10-6,HREE<5×10-6,Y<20 ×10-6;而围岩的∑REE>290×10-6,LREE>240×10-6,HREE>40×10-6,Y>70×10-6.可将萤石矿石的稀土元素的分布型式分为轻、重稀土富集型两类一类矿石的∑REE多小于29×10-6,LREE/HREE和La/Yb分别大于7和12,δEu、δCe的变化范围分别为0.85～1.10,Ce、Eu基本不显异常;另一类的∑REE 约18×10-6 ,LREE/HREE和La/Yb分别小于3和2,δEu为0.45～0.70,δCe为0.70～0.90,具明显的负Eu异常,Ce微具负异常.矿石与围岩的稀土地球化学研究显示,该萤石矿系岩浆热液成因.     

A捕收剂在磷矿石浮选中优缺点性能研究和改进措施探索

通过对一些难选磷矿石系统的浮选试验研究发现:A捕收剂作为一种不饱和脂肪酸,可以取代或者部分取代AW、阜新皂等其它浮选捕收剂;另外,当A捕收剂与表面活性剂组成脂肪酸类混合型捕收剂时,可改善A捕收剂的浮选性能,并取得了较好的试验结果。     

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．     

石英与钠长石浮选分离的研究

用十八胺(阳离子捕收剂)和十二烷基磺酸钠(阴离子捕收剂,SDS)作浮选为捕收剂分离石英与钠长石,研究了浮选条件对分离效果的影响以及捕收剂在矿物表面的吸附行为.结果表明,最佳浮选条件是浮选液的pH=2,阴、阳离子捕收剂的浓度分别为3.0×10-6 mol/L和4.0×10-6 mol/L;阴阳离子捕收剂在石英与钠长石两种矿物上表现出相同的吸附行为.在最佳浮选条件下,对不同配比的石英和钠长石混合物进行浮选,石英回收率为14%,钠长石回收率达80%,分离效果显著;对含微量长石的石英矿粉进行浮选,分离效果与石英与钠长石混合物相近.     

某萤石矿阶段磨矿阶段浮选工艺探讨

某萤石矿中萤石与石英密切共生.采用磨矿-浮选工艺流程进行选矿试验,虽然所得萤石精矿w（CaF2）达98％以上,但精矿中杂质w（SiO2）＞1％.采用阶段磨矿阶段浮选工艺流程,获得了w（CaF2）=98.07％,w（SiO2） =0.77％的优质萤石精矿;粗精矿再磨使萤石充分单体解离,有助于降低浮选精矿中二氧化硅.     

Interaction of thionocarbamate and thiourea collectors with sulphide minerals: a flotation and adsorption study

The ability of O-isopropyl-N-ethyl thionocarbamate (IPETC), O-isobutyl-N-ethoxycarbonyl thionocarbamate (IBECTC) and butyl ethoxycarbonyl thiourea (BECTU) collectors to increase the flotation of the sulphide minerals, chalcopyrite, galena and pyrite, has been studied. For each collector, the flotation characteristics of these minerals, flotation rate constant and flotation recovery maximum, have been calculated from the flotation data and compared as a function of pH and collector concentration. Overall, the flotation performance of these collectors is stronger for chalcopyrite than for galena and pyrite. Flotation increases with collector concentration and decreasing pH values. For chalcopyrite, the collector performances of BECTU are slightly better than those of IPETC but far superior to those of IBECTC, especially at high pH values or at low collector concentrations. The flotation performance of these collectors has been shown to be in good agreement with the amount of collector adsorbed at the mineral surface. The affinity of BECTU for the various minerals has been calculated using a multilayer adsorption model.     

新型捕收剂RA-92在低品位碳酸锰矿选矿中的应用

微细粒低品位锰矿由于颗粒间的非选择性聚集、浮选药剂用量大、浮选效率低等技术难题而致使其利用困难,造成大量浪费。在品位低于13%的锰矿浮选技术研究中,捕收剂最受关注,前人已研究了多种类型的捕收剂,所得精矿品位在16.9%~18.3%之间,回收率为56%~97%,回收率比较理想,但精矿品位总体不高。本文将新型捕收剂RA-92应用于湖南凤凰-花垣地区低品位碳酸锰矿(锰品位为10.7%)的选矿工艺中,实验研究了磨矿细度、pH值、抑制剂和捕收剂用量对浮选效果的影响,在最佳工艺条件下,精矿品位由原矿的10.7%提升至17.4%,回收率达到80.2%。研究表明RA-92对碳酸锰矿具有良好的捕收性能,浮选工艺相对简单且捕收剂用量少,浮选成本较低,可为此种捕获剂在微细粒低品位碳酸盐锰矿选矿中的应用得到推广。     

Effect of collector, pH and ionic strength on the cationic flotation of kaolinite

The effect of amine collector type, pH, and ionic strength on the flotation behaviour of kaolinite was investigated in a series of laboratory batch flotation tests. In distilled water, ether diamine, a strong collector for silica, does not induce any flotation or only very weak flotation of kaolinite over a wide pH range from pH 3 to pH 10.5. Ether monoamine causes strong flotation of kaolinite in distilled water, especially in acidic solutions, but high dosages of the collector are required. Such observations are in contrast to the flotation behaviour of oxide minerals such as silica for which ether diamine shows stronger collecting power than ether monoamine. The pH dependence of kaolinite flotation is also opposite to that of oxides, with lower flotation recovery obtained at higher pH. In contrast to oxides, the flotation recovery of kaolinite increases with ionic strength. It was demonstrated that the enhanced flotation of kaolinite in NaCl solutions cannot be attributed to the frothing ability of NaCl or the intercalation of kaolinite by alkylamines. It is proposed that the screened zeta potential of kaolinite particles in a high ionic strength environment causes random aggregation of kaolinite particles exposing hydrophobic (001) silica plane in the presence of ether amines.     

The influence of humic materials on the flotation of coal

The effect of humic material on the flotation response of coal has been examined. The results show that while hydrogen ions do not adversely affect the flotation of coal particles, they interact with humic material adsorbed on the surface of the clay particles and render their surfaces oleophilic. This behaviour enables the clay particles to adsorb collector in preference to the coal particles and thus inhibit coal flotation.     

ToF-SIMS-derived hydrophobicity in DTP flotation of chalcopyrite: Contact angle distributions in flotation streams

Particle hydrophobicity has been derived from Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) measurements and its impact on the flotation behaviour of chalcopyrite investigated. Batch flotation tests were performed using a dithiophosphate-type of collector in different concentrations. Three flotation regimes were studied using particle size ranges of 20–38 μm, 75–105 μm and 150–210 μm. The individual particle contact angle, and hence, the distribution of contact angles of chalcopyrite within feed, concentrate and tail flotation samples has been determined using ToF-SIMS secondary ions. The effects of particle size and hydrophobicity on the flotation behaviour have been investigated using this new approach. The hydrodynamic effects of the particle size were highlighted by the different distributions of contact angles obtained for each concentrate size fraction, with fine and coarse sizes requiring higher average contact angles to float. This effect was overtaken by hydrophobicity when a high collector concentration was used. The broad distribution of contact angles observed in all samples, i.e. heterogeneity in hydrophobicity, has significant consequences for interpreting flotation behaviour. The methodology of analysis conducted in this study was applied to real ore and can be used as a quantitative, diagnostic tool for examining surface chemical factors affecting hydrophobicity. This new technique has promise and may advance the understanding of mechanisms, which may lead to better control strategies for improving flotation performance. Furthermore, any mineral–collector system can be targeted, provided appropriate calibration is performed.     

Flotation of synthetic zinc carbonate using potassium ethylxanthate

An attempt at flotation of fine grains of zinc carbonate using potassium ethylxanthate as the collector and sulphydryl and copper ions as the activators has been undertaken. Results of the flotation tests have been interpreted in terms of the adsorption of activating agents as well as the grain size effect.     

Hallimond tube flotation of scheelite and calcite with amines

Hallimond tube flotation experiments have been carried out on the two calcium minerals scheelite and calcite using dodecylammonium chloride as collector. The main variables studied were the calcium ion concentration and the pH.In the case of scheelite, addition of calcium chloride markedly lowered the flotation recovery. Recovery was also lowered when the pH was reduced below about 10. Since it is known that the zeta potential of scheelite is almost independent of pH this confirms that co-adsorption of un-ionized amine is necessary for good flotation. Other un-ionized long-chain molecules can replace the amine; thus it was shown that excellent flotation can be obtained event at about pH 7 by adding dodecanol together with dodecylammonium chloride. With the completely ionic trimethyldodecylammonium chloride recoveries were poor and were independent of pH.In the case of calcite, calcium chloride had no immediate effect on flotation recovery, but at low collector concentrations marked depression occurred after many hours standing in the presence of calcium ions. The effect of pH on flotation of calcite was anomalous and there appear to be two pH regions in which recoveries are high.The results are discussed and attention is drawn to the need for more thorough studies of the calcium carbonate/water interface.     

Surface chemical mechanisms of inadvertent recovery of chromite in UG2 ore flotation: Residual layer identification using statistical ToF-SIMS analysis

In the UG2 ore (Bushveld Complex, South Africa) flotation, normally more than 3% of the gangue minerals, principally chromite with talc and pyroxene, report to the concentrate diluting the PGM recovery and contributing to subsequent processing costs. Previous studies have identified residual talc-like layers on orthopyroxene surfaces in Merensky ore flotation contributing to inadvertent flotation of relatively large particles (20–150 µm) of this mineral. Chromite (75–150 µm) from flotation of UG2 ore has been similarly examined. Statistical comparison of ToF-SIMS analysis of particles from concentrate and tails reveals no significant difference in Cu, Pb, Ni and collector (IBX and DTP) signals between these streams but surface exposure of Mg and Si is favoured in the concentrate. The flotation rate of coarse chromite correlates with the exposures of magnesium and silicon in patches on the chromite surface; higher exposures give earlier flotation. Conversely, there is a negative correlation with signals corresponding to the chromite surface, i.e. Cr, Fe, Al. Flotation of chromite without collector has confirmed this statistical discrimination. Hydrophobic talc-like residual layers, similar to those found on orthopyroxene surfaces, probably from partial alteration, explain this flotation mechanism.