Nutritive Evaluation of the Bambara Groundnut Ci12 Landrace [Vigna subterranea (L.) Verdc. (Fabaceae)] Produced in C?te d’Ivoire

The nutritional evaluation of the Bambara groundnut Ci12 landrace (Vigna subterranea (L.) Verdc.) seeds produced in Côte d’Ivoire shows a 19% content of protein, containing all the essential amino acids with tryptophan as the limiting amino acid, a total dietary fiber level of 10%, with a low soluble fraction content, and a fat content of 1.4%, with a high proportion of total unsaturated fatty acids (61%) of which 36% were n-6 fatty acids. This legume contains phosphorus, as the major mineral, followed by magnesium and calcium, and trace elements (iron, copper and zinc). It is characterized by the same amount of α-tocopherol and antioxidant capacity as common legumes. The high concentration of essential amino acids, n-6 fatty acids and minerals, mainly Fe, in the Ci12 landrace of Bambara groundnut indicates that this local legume has the potentiality to improve the nutritional status in Côte d’Ivoire and it could be regarded as a nutrient dense food.     

鄂尔多斯盆地西部长8储层胶结物特征

运用偏光显微镜、X衍射、扫描电镜等分析测试技术,对鄂尔多斯盆地西部长8储层砂岩胶结物类型及特征进行研究,结果表明:研究区粘土胶结物以伊利石、高岭石、绿泥石和伊蒙间层矿物为主,其相对含量分别为20.11%~42.19%、18.13%~32.51%、23.84%~62.72%、1.86%~25.10%。由于岩石中含有较多的富铁凝灰质,大部分在沉积成岩环境中绿泥石化,这类物质在进入沉积水域之后发生了强烈的水化作用并析出大量的铁氧化物,从而形成了对粘土矿物的侵染,说明沉积环境Eh值比较高,沉积—早成岩早期环境相对比较开放,大量三八面体绿泥石的出现反映了早成岩中晚期强烈的还原环境。碳酸盐类胶结物以方解石为主,其次为铁白云石和菱铁矿。C/O同位素分析表明,碳酸盐胶结在本区贯穿于整个成岩期。普通方解石一般形成于成岩早期,铁方解石和铁白云石形成于成岩中、晚期。     

国外某铁金钴矿选矿试验研究

国外某铁矿富含金和钴,主要有价矿物为磁铁矿,其次是自然金和钴矿,根据矿石性质,综合对比了"磁-浮"与"磁-重"两种流程,最终,采用"磁-重"联合流程,在原矿含铁49.89%,含钴0.047%,含金0.82g/t的情况下,获得产率69.98%,铁品位67.63%,回收率93.81%的铁精矿;产率0.25%,钴品位10.22%,回收率56.51%,金品位197.57g/t,回收率57.21%的含金钴精矿。     

硅酸盐矿物浮选过程的理论模拟

由于硅酸盐矿物在各类矿物加工中具有十分重要的地位,几乎所有的矿物加工过程都涉及有用矿物与硅酸盐矿物的浮选分离过程,开展硅酸盐矿物的浮选,尤其是复杂矿物体系硅酸盐浮选的实践与理论研究,具有重要的意义。本文结合本课题团队对烷基胺类浮选药剂在云母类层状硅酸盐矿物表面吸附的分子动力学模拟,重点阐述了计算模拟研究方法、理论与力场等,通过研究捕收剂/水/矿物体系的动力学过程,了解捕收剂在矿物表面的吸附形态、疏水性和疏水链等物理性质。     

吉林开山屯铬铁矿自然重砂异常及找矿指示意义

自然重砂测量是矿产勘查的最直接手段,在实践中能够有效揭示找矿线索。吉林省开山屯铬铁矿床具有悠久的开采历史,通过对与基性—超基性岩密切相关的开山屯铬铁矿床的标型矿物,即铬铁矿、黄铁矿、自然金、辰砂等自然重砂矿物的统计分析,异常的空间分布特征以及空间组合特征,全面展示了开山屯铬铁矿床自然重砂矿物异常的规律性。并结合该矿床化探异常的综合研究,确定了铬铁矿重砂异常的矿致性质以及重要的找矿指示意义。同时建立起开山屯铬铁矿床的重砂找矿模式,并对模型进行了初步探讨。     

Swelling of clay minerals in ammonium leaching of weathered crust elution-deposited rare earth ores

The effect of hydrated radius, cation valence, pH and solution concentration on the zeta potential of clay minerals was investigated, and the relation between zeta potential of clay minerals and swelling was discussed in different leaching agents as well. The results show that the zeta potential of clay minerals decreases with the hydrated ionic radius increasing. It could be seen that the zeta potential of the clay minerals in AICl_3 solution is positive,whereas that in NH_4C1, KCl and MgCl_2 solution is negative. And the zeta potential of clay minerals increases with the cation valence increasing. Moreover, the zeta potential of clay minerals decreases with the solution pH increasing,whereas that increases with the solution concentration increasing in different ammonium solutions. In addition,the swelling of clay minerals decreases while the zeta potential of clay minerals increasing in different ammonium solutions. The ability of compound ammonium to inhibit the swelling of clay minerals is lower than that of single ammonium solution.     

超细立磨在非金属矿超细加工中的应用

应用料层高压研磨粉碎和涡流超细分级相结合的原理,使ATL新型超细立磨可以进行非金属矿的超细加工,其具有显著的节能效果,缓和了超细微粉细度、产量和能耗之间的矛盾,超细立磨越来越受到客户的青睐,已成为非金属矿超细微粉行业的主流设备.本文介绍的ATL超细立磨工艺系统以及在超细重钙领域的成功应用,证明了其在非金属矿超细加工领域具有优质性能和较高应用价值,其生产指标和产品性能指标均达到台湾同类超细立磨的标准.     

Correlation and Prediction of Thermodynamic Data for Oxide and Silicate Minerals

Often one needs to estimate heat capacities and related properties such as the entropy for a particular material through interpolation, extrapolation, or comparison with data for related materials. A scheme is discussed to perform such estimates, focusing on the vibrational entropy. At intermediate and high temperatures, the entropy depends only on the logarithmic average over the phonon frequencies. This average can be factorized, so that the atomic masses separate from the interatomic force constants. Thus, one can account for the mass effect in the vibrational entropy and get a remaining quantity which depends only on the force constants, i.e., on the electronic structure, and shows a strong regularity when chemically similar materials are compared. In the framework of these ideas, estimates based on an additivity rule for the entropy of a complex system in terms of the entropies of the constituents, and also relations between the vibrational entropy and sound velocities, are discussed. Oxide and silicate minerals are used as examples.     

莫斯科西南部人工填土的物质成分与性质特征

现代大型城市中广泛分布着人工填土,以莫斯科西南部为例,详细说明其成因,矿物与化学成份,并对粒度与微聚集成份进行分析,对其工程地质性质特征做出分析。莫斯科西南部人工填土中含有大量原生硅酸盐,如石英、钠长石、微斜长石;含有非晶质物、少量的碳酸盐与粘土矿物。由于有机物的存在,土样都具有一定的亲水性。土样的化学成分与俄罗斯板块第四纪粘土状土的化学成分很相似。粒度成分与土的成因具有一致性,从试验结果反映出人工填土具有很强的不均匀性和较低的聚集性.根据塑性指数可以将其归类为粉土和亚粘土,而土的分散度对其水理性质起着决定性的作用。人工填土的活动性指数很低,基本属于相对不活动类型的土。莫斯科西南部人工填土与天然土相比具有较差的力学性质,还未形成坚实的土体结构。     

The influence of different minerals on the mechanical resistance of asphalt mixtures

The adsorption of five asphalts processed in Brazilian refineries and designated as A, B, C, D and E, and their asphaltenes and maltenes constituents, from toluene solutions, onto quartz, feldspar and biotite and the relationship between this tendency and the mechanical properties of the asphalt pavement have been investigated. For all minerals asphalts A and C strongly absorbed the others. Their respective curves levelling off between 3.5 and 4.0 mg g^− 1 for gneiss and quartz, increasing to 5 and 6 mg g^− 1 for feldspar and biotite. The eletrophoretic mobility of quartz was not modified by the adsorption of asphaltenes in contrast to that observed for feldspar and biotite, indicating that the sites liable for the surface charge of the latter minerals were affected by the presence of the adsorbed organic species. Regarding the mechanical resistance tests for asphalt mixtures, only asphalts A and C gave that would be considered values acceptable by the Brazilian National Department of Terrestrial Infra-structure (DNIT) (> 80%). Those results indicate that the chemical interaction among minerals and asphalts should affect for good or bad the mechanical resistance of the asphalt mixture.