共查询到20条相似文献,搜索用时 109 毫秒
1.
难处理金精矿加压氧化-氰化提金工艺研究 总被引:8,自引:0,他引:8
对新疆阿希难浸金精矿进行了酸性加压氧化-氰化浸金试验研究,考察了各种因素对加压氧化和氰化浸金效果的影响。在适宜条件下,金浸出率达到97%以上。 相似文献
2.
碱性热压氧化预处理浑江金精矿提金工艺试验研究 总被引:1,自引:0,他引:1
热压氧化预处理提金工艺已被成功地用于难处理矿石中金的回收.特别是酸性热压氧化法应用较多,自1985年以来,先后被美国的Mclanglin金矿,巴西的Sao.Be-nto金矿和美国的Getchell金矿等用来处理难浸金矿,而用于难处理金矿的碱性热压氧化法的报道较少,美国的Mercur金矿是其中之一.无论酸性还是碱性热压氧化其主要目的都是通过适当地破坏对金形成包裹的矿物的晶格结构,使金解离暴露出来,以便用常规氰化法提金.实际应用中要根据矿 相似文献
3.
4.
康家湾含砷金硫精矿提金工艺的研究进展与评述 总被引:1,自引:0,他引:1
介绍了康家湾含砷金硫精矿的矿物特征与几种提金工艺的研究进展,评述了各方案的优、缺点,指出了采用焙烧法和生物预氧化提金工艺的应用前景。 相似文献
5.
7.
细菌氧化—氰化浸金工艺试验研究 总被引:5,自引:0,他引:5
主要介绍了对其含砷浮选金精矿进行的100kg/d细菌氧化-氰化浸金连续扩大试验所取得的成果;并对试验结果进行了分析与评价;同时指出了今后细菌氧化-氰化浸金的研究方向。 相似文献
8.
介绍了康家湾含砷金硫精矿的矿物特征与几种提金工艺的研究进展,评述了各方案的优缺点,指出了采用焙烧法和生物预氧化提金工艺的应用前景。 相似文献
9.
10.
难处理金精矿生物氧化-氰化炭浸法提金试验 总被引:1,自引:0,他引:1
针对某难处理金精矿含砷、高碳的特点,采用生物氧化-氰化炭浸提金工艺,考察了矿浆浓度、氧化时间、溶氧量、搅拌速度、培养基用量等因素对Fe、As、S脱除率、硫化物氧化率及金浸出率的影响。氰化炭浸试验结果表明,金的浸出率由直接氰化炭浸时的15.53%提高到95.82%,同时分析了氧化过程Eh、pH变化及Fe的行为。 相似文献
11.
Experimental studies in man are an indispensable complement to epidemiological studies and experimental studies on animals. They aim at understanding the mechanisms of action of the main pollutants and at knowing their thresholds of triggering of the acute effects on the respiratory system. The studies made in man involve controlled exposure to different atmospheric pollutants, with measurement of the functional respiratory repercussions, studies of modification of the cells in broncho-alveolar lavage, as well as experimental protocols that combine inhalation of allergen and exposure to atmospheric pollutants by allergic subjects. The main results that are available are reported to distinguish those from normal subjects and those who are allergic. More recent protocols are based on exposure to concentrations that are close to atmospheric concentrations or those that are met in work places. The main data in the literature are reported in this journal and concern SO2 acid aerosols, dioxides of nitrogen, ozone and diesel particles. Pathogenic hypotheses concerning the undesirable effects of atmospheric pollutants on the respiratory system are considered. 相似文献
12.
The fact that centrally acting analgesics have abuse potential commensurate with their analgesic activity raises the question of whether these effects are related. The abuse potential of drugs depends on their ability to produce reinforcing effects, which are mediated by a neural system that includes the ventral tegmental dopamine cells and their connections with the ventral striatum. Morphine and amphetamine are both powerful analgesics and have high abuse potential. Their analgesic and reinforcing effects are mediated by similar receptors, similar sites of action, and overlapping neural substrates. These coincidences suggest that reinforcers may produce analgesia by transforming the aversive affective state evoked by pain into a more positive affective state. The implications of this hypothesis and its relation to other known mechanisms of analgesia are discussed. The hypothesis predicts that drugs with reinforcing effects should produce analgesia. A survey of drugs acting through 21 classes of receptors reveals that in 13 classes there is evidence for both analgesic and reinforcing effects that are approximately equipotent. The GABA(A) agonists were found to be the only drugs with confirmed abuse potential that lack analgesic activity. The interpretation of this and several other anomalous cases is discussed. 相似文献
13.
The mechanical characteristics of rock masses anchored with bolts play a critical role in anchored slope and underground buildings. In this study, the components and their mixing ratios of similar materials, such as rock masses, are simulated. The materials similar to the anchored bolts and cement are selected. The physical and mechanic properties of these materials are tested. Based on these, an experimental model and a method are designed with a focus on a uniaxial compression test on anchored rock masses. A series of tests on the anchored specimens’ uniaxial compression strength are conducted under the conditions of varying numbers and installations of anchor bolts. The results reveal that compared with the specimens without anchor bolts, the peak strength, elastic modulus, and shear strength of the specimens with both perpendicular and horizontal bolts are improved. Furthermore, it is indicated that the improvement attributable to the horizontal bolts is slightly lower than that with vertical bolts. This suggests that the uniaxial compression strength is heterogeneous in different directions. 相似文献
14.
Assessment of Time of Concentration Formulas for Overland Flow 总被引:2,自引:0,他引:2
Tommy S. W. Wong 《Canadian Metallurgical Quarterly》2005,131(4):383-387
Despite the importance of overland time of concentration on the design discharge, engineers are often bewildered by the array of formulas available in the literature without knowing the accuracy of each formula. This assessment covers nine formulas published between 1946 and 1993, which are intended for overland flow only that is subjected to uniform rain. The assessment compares the estimates from the formulas with experimental values that are derived under the same conditions for two surfaces: concrete and grass. The assessment shows that formulas that do not account for the rainfall intensity are only valid for a limited range of rainfall intensities. The formulas that account for the rainfall intensity generally show better agreement with the experimental data. Finally, the assessment gives two rankings of the formulas for the two surfaces in accordance to their accuracy as compared to the experimental data. The formula that has the best accuracy for both surfaces is the Chen and Wong formula. 相似文献
15.
The data, presented by Eysenck (see 30: 909), concerned with the notion that communists and fascists are similar in being "tough-minded" and "authoritarian" are critically examined. A detailed treatment of the sampling and measurement techniques employed to obtain the revelant data are presented. The author concludes that: (1) "The samples studied are not representative of the present population, and that generalizations drawn from these samples are therefore unwarranted; (2) the 'tough-mindedness' scale leads to misleading comparisons among members of various political parties because of biases built into the scoring system." In addition, the author concludes that the communists and fascists did differ from one another in many "crucial aspects." (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
16.
晶内铁素体及其组织控制技术研究概况 总被引:1,自引:0,他引:1
介绍了晶内铁素体的组织特点以及晶内铁素体组织对钢材力学性能的影响,得出晶内铁素体能显著提高钢的冲击韧性。详细阐述了晶内铁素体的形核机理,分析表明目前晶内铁素体形核机理仍不够完善,尚未形成统一的机制。同时介绍了钛氧化物、MnS、稀土氧化物等促进晶内铁素体形核的夹杂物,指出含Ti复合夹杂物是理想的晶内铁素体形核核心。最后分析了夹杂物尺寸、冷却速度对晶内铁素体形核的影响,并简述了一些晶内铁素体组织控制技术,结果表明Ti-B 处理、Ti-Mg处理效果优于单独的Ti处理。 相似文献
17.
Evaluation of Cyclic Softening in Silts and Clays 总被引:2,自引:0,他引:2
Procedures are presented for evaluating the potential for cyclic softening (i.e., onset of significant strains or strength loss) in saturated silts and clays during earthquakes. The recommended procedures are applicable for fine-grained soils with sufficient plasticity that they would be characterized as behaving more fundamentally like clays in undrained monotonic or cyclic loading. The procedures are presented in a form that is similar to that used in semiempirical liquefaction procedures. Expressions are developed for a static shear stress correction factor and a magnitude scaling factor. Guidelines and empirical relations are presented for determining cyclic resistance ratios based on different approaches to characterizing fine-grained soil deposits. The potential consequences of cyclic softening, and the major variables affecting such consequences, are discussed. Application of these procedures is demonstrated through the analysis of the Carrefour Shopping Center case history from the 1999 Kocaeli earthquake. The proposed procedures, in conjunction with associated liquefaction susceptibility criteria, provide an improved means for distinguishing between the conditions that do and those that do not lead to ground deformations in fine-grained soil deposits during earthquakes. 相似文献
18.
AL Koch 《Canadian Metallurgical Quarterly》1998,149(10):689-701
The organization of chains of oligopeptidoglycan in the saccular wall is of critical importance in the study of the mechanism and physiology of prokaryotic wall growth. The electron microphotographs of De Pedro et al. present new findings and can be used to negate or at least raise questions about the previously accepted conclusion that the glycan chains are oriented transversely to the axis of rod-shaped Escherichia coli. This suggests caution in assuming that the glycan chains in the murein structure are parallel to each other and are perpendicular to the axis of the cell. These results should reopen the question of not only the orientation of the peptidoglycan chains, but the possibility of variability in orientation. Three classes of hypotheses about wall growth are reconsidered and problems with them are presented. The new results from De Pedro's laboratory and the experimental glycan chain length distribution argue against proposed systematic models. These include models that postulate belts or hoops stretched around the circumference of the cell and mechanisms that insert new chains of the length of presumptive "docking" strands in the stress-bearing wall. They are consistent, however, with the surface stress theory that proposes that random enzyme action together with physical forces are involved in the elongation of the rod-shaped Gram-negative wall. 相似文献
19.
20.
Experimental Investigations of Response of Suction Caissons to Transient Vertical Loading 总被引:1,自引:0,他引:1
Suction caissons are a relatively new design being considered for use as foundations in a wide variety of offshore applications. They are unusual in that, in contrast with the development of offshore piling, there is no onshore experience that can be used as the basis for the development of designs. It is therefore essential to identify key behavioral patterns and mechanisms that govern capacity under a wide variety of loading regimes, particularly those derived from the cyclic wave loading. The object here is to establish a broad framework of response. More detailed work specific to a site or project would be required for detailed design. This paper describes experimental investigations into the vertical loading response of a suction caisson foundation. The experiments are carried out on the laboratory floor using a sophisticated three-degree-of-freedom loading rig. The caissons are embedded in sand saturated with viscous silicon oil so that modeled drainage times are representative of typical offshore conditions. The experiments involve cyclic loading about different mean loads, including cycling into tension and monotonic loading at different rates. The relationship between the cyclic loading and monotonic loading is explored. One of the key conclusions from the results is that serviceability requirements will dictate design rather than capacity. Perhaps surprisingly, for the experiments undertaken, the rate of loading had little effect on the response. 相似文献