Advanced Materials Research Vols. 989-994

Abstract: This paper has a comprehensive analysis on the bauxite in Wuchuan-Zheng, an-Daozhen (WZD) area, northern Guizhou, China through synthesize former research. The understanding of mineralogic, petrologic and geochemical characteristics is deep, and sedimentary environment, parent rock and mineralization process have been defined. Main questions need further research as follow: minerogenetic epoch; migration mechanism of elements; genesis of rare earth mineral.

Abstract: At present, relatively few drilling surveys have been conducted on coral reefs, and comprehensive geological info on coral reefs is difficult to obtain. However, research of coral reef is of great importance to our development and exploitation of maritime resources. The survey of South China Sea some Islands saw China’s first usage of digital borehole camera technology, which resulted in a large amount of first-hand geological data. Because the coral reef, special rock mass, integrity evaluation is very difficult, we proposed the RMDI and coring rate comparative analysis method. The evaluation method is applied to the South China Sea some Islands, and the evaluation results prove generally consistent with actual cores. The results indicate that: (1) high-resolution borehole images can provide reliable results for evaluation of coral reef integrity; (2) The RMDI and coring rate comparative analysis method is a feasible approach for the evaluation of coral reef integrity along the full or partial depth of a borehole.

Abstract: Through systematically geologic survey and observation of drills and rock slices this paper have a comprehensive research on special structure of bauxite in Wuchuan-Zheng^,an-Daozhen (WZD) area. Special structure mainly includes directional structure of clast, leaching structure and colloid structure. Clast is erratic boulder indicating high energy environment. Leaching structure shows there is an eluvial process in mineralizaton process, and leaching is important for the formation of high grade bauxite. Appearance of colloidal in WZD bauxite shows that agglutinate of gel is one of the reasons for the formation of WZD bauxite. Clastic structure, leaching structure and colloidal structure demonstrate that mineralizaton process of WZD bauxite is a very complicated process.

Abstract: Through systematically geologic survey, observation of drills and rock slices and geochemical analysis this paper have a comprehensive research on oxidized and reduced conditions of bauxite in Wuchuan-Zheng^,an-Daozhen (WZD) area. The results shows that color, component, lithology and grade of WZD bauxite have vertical alteration; Metallogenetic environment of WZD bauxite in penecontemporaneous period is oxidized, and from top to bottom, oxygen content is gradually decreased; Not only the similar stratigraphic position in different zone of WZD area have different oxygen content, but also identical stratigraphic position in different period has different oxygen content.

Abstract: Beneficiation of a low-grade barite ore assaying 64.32% BaSO₄ was conducted by flotation using sodium oleate and sodium silicate. The effect of grinding fineness, type and dosage of flotation reagent in roughing were investigated. Based on the optimum flotation conditions, a close circuit flowsheet was established. Finally, two barite concentrates assaying 96.32% and 91.26% BaSO₄ can be obtained at the recovery of 91.94% and 5.25%, respectively, by applying two-time roughing and two-time cleaning operations.

Abstract: Effect of grinding fineness and inhibitors on mixed flotation of low copper and nickel were studied and a new nickel inhibitor YS was used in the process of separation of copper and nickel. The results indicated that the high-quality mixed concentrate with the recoveries of Cu and Ni 76% and 65.6% and the grade of Cu and Ni were 4.66% and 4.3%, respectively, was got under the condition of sodium silicate (200 g/t), CMC (200 g/t), copper sulphate200 g/t, amyl xanthate 100 g/t and pine oil 30 g/t with the grinding fineness of-0.074mm80%. Then, Qualified Cu concentrate with the grade26.65% and recovery 55.62%, Qualified Ni concentrate with the grade26.65% and recovery 55.62%, respectively, were got by using the new nickel inhibitor YS in the separation flotation of copper and nickel.

Abstract: The concentration and distribution of Cr, Pb and Zn in 22 Jurassic coals from northern Shaanxi,and Ningxi, China were studied. The samples were collected from eight coal mines of five different region, including Yuyang Region, Hengshan, Shenmu, Huangling and Lingwu. Comparing with Chinese coals, American coals and coal Clarke value: Pb showed different degree enrichment in the study region except Ningxia ; Cr was enriched in Shenmu coals, Huangling coals and Hengshan coals; whereas the content of Zn in the study region coals was lower than in American coals. Horizontal variation of the three elements in the study region indicated that different elements showed different variation trend. Based on statistical analyses, Pb showed a moderate relationship with ash yield, whereas Cr had a high correlation coefficients with total sulfur.

Abstract: Water level determines channel capacity, in order to protect the safety of navigation and give full play to the advantages of shipping, the paper analyzes the relationship between the draft and loading rate of various types of ships, and proposed the quantitative model of impact of water level changes on channel capacity, the results showed: small ships are less affected by water level changes, and large ships are great affected by water level changes, the actual amount of cargo related the ship design parameters, this article has a certain reference value for navigation management and planning.

Abstract: Carbonate reef reservoir buried deeply, show great heterogeneity, Therefore, effective reservoir prediction is the key to the biohermal reservoir. In practical research, based on of the single well sequence stratigraphic framework, combined with these sequence stratigraphic framework and seismic section, found the reservoir development area in the longitudinal, which sq1-HST and sq3-HST is the main period of reservoir development, and then through the seismic Seismic multiple-attribute inversion, predicted porosity of system tracts of reservoir development in the sequence stratigraphic framework. Porosity inversion results shown, Changxing formation reservoir is mainly distributed in the central and north-central of Jiannan area.

Abstract: Acidity and alkalinity of metallogenetic environment in penecontemporaneous period is very important for the informing of high grade bauxite. Through the research on migration regular of elements, the position of rare earth mineral and the qualitative alternation of bauxite we found that metallogenetic environment is acidic in penecontemporaneous period, from top to bottom of the profile acidity is decreased gradually. In the acidic condition, Si and Fe moved downward but Al is relative enrichment in the middle-upper part of profile.