某金矿尾矿提纯石英应用对比试验研究

针对某金矿，在回收金银的基础上，对金银浮选尾矿进行云母和长石浮选，以及提纯石英试验，最终获得SiO2品位99.91%的石英产品。提纯石英产品与比利时矽比科矿业有限公司石英产品进行对比试验，通过化学成分、粒度组成、熔制、粘度和热膨胀系数测试对比试验，得出金矿提纯石英达到甚至超过矽比科进口石英产品的各项技术指标。     

Sintering behaviour of fluorapatite–silicate composites produced from natural fluorapatite and quartz

In this work, the sintering behaviour of fluorapatite (FAp)–silicate composites prepared by mixing variable amounts of natural quartz (2.5 wt% to 20 wt%) and FAp was studied. The composites were pressureless sintered in air at temperatures from 1000 °C to 1350 °C. The effects of temperatures on the densification, phase formation, chemical bonding and Vickers hardness of the composites were evaluated. All the samples exhibited mixed phase, comprising FAp and francolite as the major constituents along with some minor phases of cristobalite, wollastonite, dicalcium silicate and/or whitlockite dependent on the quartz content and sintering temperature. The composite containing 2.5 wt% quartz exhibited the best sintering properties. The highest bulk density of 3 g/cm³ and a Vickers hardness of >4.2 GPa were obtained for the 2.5 wt% quartz–FAp composite when sintered at 1100 °C. The addition of quartz was found to alter the microstructure of the composites, where it exhibited a rod-like morphology when sintered at 1000 °C and a regular rounded grain structure when sintered at 1350 °C. A wetted grain surface was observed for composites containing high quartz content and was believed to be associated with a transient liquid phase sintering.     

Strength and dilatancy behaviors of deep sands in Shanghai with a focus on grain size and shape effect

With rapid development of infrastructures like tunnels and open excavations in Shanghai, investigations on deeper soils have become critically important. Most of the existing laboratory works were focused on the clayey strata up to Layer 6 in Shanghai, i.e. at depth of up to 40 m. In this paper, Layers 7, 9, and 11, which were mostly formed of sandy soils at depth of up to 150 m, were experimentally investigated with respect to physico-mechanical behaviors. The stress–strain behaviors were analyzed by the consolidated drained/undrained (CD/CU) triaxial tests under monotonic loading. One-dimensional (1D) oedometer tests were performed to investigate the consolidation properties of the sandy soils. Specimens were prepared at three different relative densities for each layer. Also, the micro-images and particle size analyzers were used to analyze the shape and size of the sand grains. The influences of grain size, density, and angularity on the stress–strain behaviors and compressibility were also studied. Compared to the other layers, Layer 11 had the smallest mean grain size (D₅₀), highest compressibility, and lowest shear strength. In contrast, Layer 9 had the largest mean grain size, lowest compressibility, and highest shear strength. Layer 7 was of intermediate mean grain size, exhibiting more compressibility and less shear strength than that of Layer 9. Also, the critical state parameters and maximum dilatancy rate of different layers were discussed.     

特细砂混凝土的应用及其经济性

通过介绍特细砂混凝土在嘉陵江流域的马回、东西关、桐子壕等水电站建设中的应用情况 ,分析了特细砂混凝土的特性和配合比等特点 ,并闸明了在施工中使用特细砂混凝土的经济效益。     

N.m.r. line shape-relaxation correlation analysis of bitumen and oil sands

The first results of the analysis of bitumen and oil sands using the recently developed n.m.r. spingrouping technique are presented. The n.m.r. relaxation experiments were carried out on bitumen, and on natural and dried oil sands samples. The results indicate that the spin-grouping can resolve and quantify several components of the samples studied. The bitumen and bitumen fraction of the oil sands are resolved according to their spin-spin relaxation times into three major groups: solid-like (rigid), solid-like (mobile) and semi-liquid. The water in the oil sands exists in two different environments. Tentatively one environment is assigned to be the bridges between the sand grains, while the other is assigned to be the clay surface. One can conclude that with spin grouping of complex mixtures the decomposition (in which components are resolved according to their dynamic state) is possible. The accuracy of such resolution is of the order of a few per cent.     

双旋Y切石英振子厚度模式的频温特性的研究

本文利用描述固体中弹性声波的克里斯托费尔方程,建立了双旋Y切石英振子厚度模式的频温特性分析方法,并编制了相应的计算机程序。该程序可给出双旋Y切石英振子在任意切角(ф_3ф_1)下的厚度模(a、b、c模)的频率温度特性曲线。文中给出了单旋AT切、BT切(b模)、双旋SC切(b、c模)、FC切、IT切、LC切、NL_1切、NL_2切、AK切等各已知切型的频温特性曲线。对石英谐振器的切角灵敏度和切角误差进行了分析。     

临南油田夏52块沙三中泥质砂岩油层精细评价

临南油田夏 5 2块沙三中泥质砂岩油层分布广 ,未动用程度高 ,为了稳定产量 ,急需寻找可直接投产的泥质砂岩油层。本文利用相渗实验资料建立油相相对渗透率与含水饱和度关系 ,从而建立有效渗透率的解释模型。依据有效渗透率和有效厚度将泥质砂岩油层划分等级 ,分区评价 ,这不仅有利于合理开采和保护此类油层 ,降低其生产成本 ,也为预测此类油层产能提供依据     

前置酸加砂压裂新工艺试验研究及现场应用

通过整合酸压和加砂压裂技术优势，集成为前置酸加砂压裂工艺技术。该工艺技术主要通过酸液溶蚀提高储层渗透性、抑制粘土矿物膨胀、溶解压裂液滤饼及残胶、酸压缝内填充支撑剂提高导流能力等4个方面的作用来提高改造效果。结合不同试验区储层特征，优选了酸液体系，创造性地形成了与长庆低渗透储层特点相适应的前置酸加砂压裂工艺技术，在镇53等5个区块共计试验百余口，取得了较好试验效果，为长庆低渗油田的改造提供了一项新技术措施。     

高黏原油和石英砂复配体系中水合物生成实验研究

在油井开采原油时,会产生伴生气,而在高压和低温环境中会生成天然气水合物,进而堵塞运输管道,因此研究油砂体系（含原油的体系）和纯石英砂体系（不含原油的体系）中水合物生成情况具有重要意义。在初始压力为4.00、6.00、8.00 MPa,石英砂粒径为20、30、60、80目,温度恒定的条件下,研究了油砂体系和纯石英砂体系中甲烷水合物的生成情况以及最终耗气量。结果表明,在初始压力相同的油砂体系中,石英砂粒径越小,水合物生成诱导期越短,水合物生成速率越大。研究石英砂粒径对水合物生成最终耗气量的影响发现,随着石英砂粒径的减小,耗气量先增加后减少,当石英砂粒径为60目时,耗气量达到最大,其值为0.19 mol。同时,对油砂体系和纯石英砂体系中水合物生成情况进行了对比。结果表明,由于两种体系中都存在SDS（十二烷基硫酸钠）溶液,因此水合物生成速率相差不大;在石英砂粒径相同的条件下,油砂体系中最终耗气量小于纯石英砂体系中的最终耗气量,这说明原油对水合物生成具有抑制作用。在油砂体系中,压力越大,越有利于水合物的生成。     

Chemistry of organosulphur compound types occurring in heavy oil sands: 3. Reaction of thiophene and tetrahydrothiophene with vanadyl and nickel salts

As part of a study of the chemistry of the steam-stimulated recovery of heavy oils, the hydrolysis and subsequent desulphurization of tetrahydrothiophene and thiophene by aqueous solutions of vanadyl and nickel salts was investigated. Vanadyl sulphate and vanadyl chloride were shown to behave very differently, emphasizing that these salts have different molecular species in aqueous solutions.