Quantitative characterisation of processed phlogopite ore from Silver City Dome District, Kansas, USA, by automated mineralogy

Historically, phlogopite and olivine have been mined in the Silver City Dome District in Kansas, USA, from lamproite ultra-potassic igneous rock for use as a supplement in cattle feed. Micro-Lite LLC is now evaluating processing techniques for recovery of phlogopite to be used for reinforcement in plastics, high temperature applications, and electrical insulators, which requires a higher grade phlogopite product. To determine the purity of the processed ore, QEMSCAN^® was utilised to identify and quantify phlogopite and impurities, including olivine, pyroxenes, feldspars, titanium phases (mainly titanite and perovskite), apatite, magnetite, chromite, and other phases. Samples were prepared and analysed in a manner to decrease or eliminate preferred orientation of phlogopite to provide accurate quantitative results. The results show that the flotation product has a higher concentration of phlogopite at 87% (by mass), compared to 78% in the hydrosizer product. The main impurity phase in both products is olivine (10% in the flotation product and 18% in the hydrosizer product). In the hydrosizer product, 15% of the sample consists of liberated phlogopite particles, while in the flotation product 58% of the sample occurs as pure, liberated phlogopite particles.     

Degradation of Phytate in Foods by Phytases in Fruit and Vegetable Extracts

ABSTRACT The ability of phytases from fresh fruits and vegetables to degrade phytate in foods was determined in vitro. In contrast to the more consistent presence of phytase in vegetables, only a few fruits contained detectable phytase activity. The highest phytase activities were 121 and 97 nmol min^‐1 g^‐1 in scallion leaves and avocado fruit, respectively. Avocado fruit also contained 0.14% phytate on a wet‐weight basis. Crude phytase extracts were incubated with ground corn tortillas or refried beans at 37 °C. Most of the phytate was degraded within 30 min by a 4‐fold excess by dry weight of scallion leaves. Avocado extracts incubated alone metabolized most of their endogenous phytate within 2 h.     

国内非金属矿干燥设备的现状与发展趋势

本文分析了国内非金属矿干燥设备的现状与发展趋势,针对目前设备存在的问题提出了新型专用干燥设备的性能要求,并对市场上可能出现的新型干燥设备的机型做了预测。     

20钢管翘皮缺陷原因分析

电子探针分析表明，翘皮缺陷内部存在聚集的大型夹杂物，翘皮缺陷的形成，是在穿管深加工过程中，管壁不断减薄，夹杂物逐渐外露，表皮外翻所致。翘皮处的夹杂物矿相是以铝酸钙和黄长石为主，还存在少量锆刚玉变质体以及镁铝尖晶石，跟下水口侵蚀反应产物相吻合；聚集的大型夹杂物与下水口侵蚀后的脱落物有关。     

Study on Visible Photoluminescence and Absorption Spectra of Fergusonite Group Minerals

The fergusonite group minerals, havingthe formula RENbO4 (RE = La, Ce, Pr, ..'Y), are known for their complicated compost.nons and .t...t...,[lj. The group mineralsgenerally appear in metamict amorphous formsin the nature. It is difficult to discern the genetic polymorphic structllres according to theiramorphous forms. High-temperature X--raydiffraetion and annealling recrystallization (a.~perimellt~ were used to study the high--temperature phase transition of the group minerals. Itwas de…     

Combined SEM/EDX and micro-Raman spectroscopy analysis of uranium minerals from a former uranium mine

Samples of the secondary uranium minerals collected in the abandoned uranium mine at Pecs (Hungary) were investigated by two micro-techniques: scanning electron microscopy (SEM/EDX) and micro-Raman spectroscopy (MRS). They were applied to locate U-rich particles and identify the chemical form and oxidation state of the uranium compounds. The most abundant mineral was a K and/or Na uranyl sulphate (zippeite group). U(VI) was also present in the form showing intensive Raman scattering at 860 cm⁻¹ which can be attributed to uranium trioxide. This research has shown the successful application of micro-Raman spectroscopy for the identification of uranyl mineral species on the level of individual particles.     

复合矿物硫酸盐激发剂对低钙液态渣的激活作用

本文探讨了复合矿物硫酸盐激发剂对低钙液态渣的激活作用。结果表明复合矿物硫酸盐激发剂能显著地提高用作水泥混合材的低钙液态渣的活性，并提高其水泥的强度，尤其是１ｄ、３ｄ的早期强度。采用复合矿物硫酸盐激发剂技术生产水泥是大量综合利用低钙液态渣的一条有效途径，具有较好的社会效益和环境效益     

‘Peaks in space’ – crystallography in planetary science: past impacts and future opportunities

Crystallography has done much to underpin and enhance our understanding of our planetary neighbours. From analysis of the samples plucked from space by audacious sample-return missions, to the detailed study of meteorites that have landed on our planet's surface; investigations of the crystal structures, the growth of components and the physical properties of these precious samples has been key to teasing out the story of these fragments and their parent bodies. To prove that there are no limits to the ends that a crystallographer will take to collect planetary data, there is now one diffractometer working another planet, Mars. Not to be daunted by the lack of samples from beyond the terrestrial planets, crystallography has also been at the forefront of in situ experiments that recreate the extremes of planetary environments. This review will capture how crystallography has been used to all of these ends and reveal a number of opportunities for future application of the technique.     

黏土矿物及粉粒对昔格达组粉质黏土可塑性的影响

结合西昌钒钛钢铁新基地所揭露的昔格达组粉质黏土的矿物组成及颗粒级配,通过验证性试验及前人研究成果,对黏土矿物及土体的颗粒级配对昔格达组粉质黏土塑性指数的影响进行分析。结果表明:黏土矿物及高粉粒含量是影响昔格达组粉质黏土可塑性的主要因素,高粉粒含量对昔格达组粉质黏土可塑性的影响比粉质黏土中黏土矿物种类及含量对其可塑性的影响大。但粉粒含量对黏性土体的塑性指数的贡献值具有一定范围,一般介于6～10。     

Adsorption of natural surfactants on sandstone rocks: Effect on the quality of the recovered asphaltenic oil

Natural surfactants are important for any enhancing oil recovery applications since these kinds of surfactants have less detrimental effects and also lower cost in comparison to the industrial surfactants. Adsorption of surfactants on sandstone minerals is an important issue which needs to be considered before applying any surfactant-based enhanced oil recovery technique. In this study, a new model based on adaptive neuro-fuzzy interference system was developed in order to simulate the kinetic behavior of natural surfactants adsorption on sandstone minerals with high accuracy. Performance of the model was investigated by comparing the results of the proposed model with the results of previous well-known kinetic models. Results demonstrated that this model has the highest accuracy compared to the other well-established models found in literature. Finally, in order to show the importance of modeling surfactants adsorption, the effect of a natural surfactant on the quality of the produced oil was investigated by performing SARA analysis on the recovered oil at various conditions of surfactant adsorption. It is shown that in the case of lower surfactant adsorption on sandstone minerals, the produced oil has higher asphaltene fractions.