硫化矿直接还原提取金属新工艺重要意义和研究现状

本从硫化矿火法冶金的现状出发，讨论研究了硫化矿直接还原提取金属新工艺的重要意义，综述了世界上对这一新方法研究的现状和存在的问题，提出了实现这一方法的可能性和思路。     

Engineering geological properties of Miocene hard clays along the middle line of the North–South Diversion Water Project in China

Miocene hard clays are widely distributed in eastern China and are associated with extensive damage to engineering structures. This paper presents the engineering geological properties of Miocene hard clays along the middle line of the North–South Diversion Water Project (NSDWP), including areas of the Nanyang Basin as well as the Fangcheng-Baofeng and Handan-Yongnian regions. Results of laboratory testing show that beneath the weathering zone the Miocene hard clays have similar engineering geological properties, including a high clay fraction with significant montmorillonite, high physico-chemical activity, high water content and high to very high shrink/swell. The effects of wetting and drying cycles on the swelling potential of the hard clays are summarized and attention drawn to the importance of these when considering excavation and construction.

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On Increase in Efficiency of Luminescent Concentration of Mineral Raw Material

The ways are considered for increasing the efficiency of luminescent separation of many types of mineral raw material due to the presence of calcite in them. The versatility of luminescent method for mineral raw material separation is shown by studying apatite-calcite ore beneficiation.     

示烃成岩矿物与油气成藏的关系——以东营凹陷为例

示烃成岩矿物是指与烃类活动具有成因关系的成岩矿物.通过综合利用地质、矿物岩石和地球化学方法,识别出了铁白云石、铁方解石、高岭石和黄铁矿4种示烃成岩矿物.对东营凹陷示烃成岩矿物在研究区不同层系中的分布和发育特征的分析结果表明,对示烃成岩矿物的研究可以在研究区流体输导体系中再现流体运动的过程及规律,分析其中控制物质演变和能量再分配的主导因素,揭示沉积盆地的油气生成、运移和成藏过程与成矿作用的对应关系,并对深部成岩作用以及油气运聚成藏在埋藏阶段的成岩响应进行评估.该研究成果对油气勘探开发具有较高的理论和应用价值.     

Iron compounds electrodeposited onto a transparent semiconductor: Synthesis and characterisation by UV-vis spectroscopy

Homogeneous thin layers of lepidocrocite, green rust incorporating chloride anions (GRCl-GR1) and green rust incorporating sulphate anions (GRSO₄-GR2) were successfully electrodeposited onto tin dioxide substrate (SnO₂). The UV-vis spectroscopy absorbance, measured just after synthesis, increases linearly with the amount of iron compounds confirming that the electrodeposition is a homogeneous process. From the spectra, the absorption coefficients were determined for the three compounds. The monitoring by UV-vis spectroscopy measurements in real time of the oxidation in the air of the two unstable compounds, GRCl and GRSO₄, shows that the two green rusts have a different behaviour due to their own structure. The presence of an isobestic point in the case of GRSO₄ translates one equilibrium with its oxidised compound. This phenomenon is not observed for GRCl, however, the characteristic variation of the absorbance in the high wavelengths gives information on its oxidation reaction. From simple measurements, fruitful information on green rusts is obtained and this experimental system may be applied to other unstable solid compounds.     

含金多金属混合矿选矿试验研究

通过对洋鸡山金矿含金多金属混合矿的两个选矿工艺流程的研究及分析比较，铜优选浮选－－硫精矿焙砂氰化－－尾矿全泥氰化工艺流程比浮选－－氰化－－浮选工艺流程优越，技术可行，经济合理。     

Occurrence of iron in industrial granitic pegmatite

Granitic pegmatite is used as raw material for industrial minerals in the production of feldspar and quartz for glass, ceramic and porcelain. One of the most important quality parameters in the feldspar is the content of iron (Fe). At the Lillesand plant, Norway, pegmatite is floated to produce quartz, albite and microcline products. Fe is mostly removed through flotation and magnetic separation, but some Fe is still present in the final products, the amount depending on the raw material source. Rietveld X-ray Diffraction (XRD), Point counting by optical microscopy, and Electron Microprobe Analysis (EPMA) combined with image analysis of Back-Scatter Electron (BSE) images was used to quantify the mineralogy and to map the distribution Fe in the pegmatites. The study showed that Fe is present as mineral inclusions in feldspar, in addition to its occurrence in minor mineral components such as mica and chlorite. The frequency of Fe-mineral inclusions was higher in albite than in microcline, and they were often associated with micro-fractures and areas of alteration. These findings reveal a potential for reducing total Fe₂O₃ in the microcline products.     

A rheological investigation of the behaviour of two Southern African platinum ores

With the installation of ultrafine grinding on many platinum operations in southern Africa, there were concerns as to whether this would cause rheologically complex behaviour during the subsequent flotation of the ore. Rheologically complex behaviour refers to the non-Newtonian behaviour experienced by some suspensions, associated with exponential increases in yield stress and viscosity with increasing solids content. This is attributed to particle size and solids concentration effects, surface chemistry, and mineralogy. In this study, the rheological behaviour of two different platinum ores; a western limb UG2 ore and a Great Dyke platinum ore were investigated and compared with that of single mineral studies of the major gangue minerals of platinum ores (chromite, orthopyroxene, plagioclase and talc). The results show that Great Dyke ore is considerably more rheologically complex than UG2 ore. Great Dyke flotation concentrate shows high yield stress and viscosity at low solids concentrations (>20 vol.% solids). Should the ROM ore in a Great Dyke flotation operation suddenly show significant changes in ore mineralogy, the rheological properties of the slurry should be considered since they may be detrimental to the overall performance of the operation (e.g. loss of recovery through poor gas dispersion). In contrast, the rheological behaviour of UG2 flotation samples shows little cause for concern for the plant operator. Comparison of the pure mineral samples shows that the complex rheological behaviour of the Great Dyke ore may be attributed to the high degree of low temperature alteration and the formation of phyllosilicate minerals such as talc, more than particle size effects.     

Distribution of lipids and trace minerals in different muscle sites of farmed and wild turbot (Psetta maxima)

Lipid and trace mineral composition were studied in different sites of the edible flesh of farmed and wild turbot (Psetta maxima). Lipid matter (total content, sterols, tocopherols) showed to accumulate in the edge zone (EZ), except for phospholipid (PL), which provided a distribution that was found to be independent from the kind of turbot and the zone considered. Fatty acid composition of total lipids showed a non‐homogeneous distribution, as the EZ exhibited a different fatty acid group composition (higher monounsaturated and lower polyunsaturated and ω3/ω6 ratio values) than the other zones considered; fewer differences were observed by considering the PL fatty acid composition. Most minerals (Ca, Cu, Fe, Mn and Se) studied showed to be homogeneously distributed along the muscle sites of the wild fish, while more differences were obtained when considering the farmed one. For both kinds of turbots, the most important difference was obtained in the case of Zn, as a largely higher content in the EZ than in the other zones was detected. A close relationship between Zn and total lipid contents (r² = 0.90 and 0.76 for farmed and wild turbots, respectively) was observed.     

Study on the discontinuance evalution theory of the minerals resource construction item

The period of the minerals resource construction items is very long, which affected largely by the changeable market. The discontinuance evalution theory and content of construction item about the resource used up and economic evalution theories of the invest were brought forward from the two aspects of the resource using value and the income rate.