Advanced Materials Research Vols. 690-693

Abstract: The gaseous fluorides formation mechanism in the roasting process of the fluorite-bearing iron concentrate was studied by thermodynamic calculation, differential thermal analysis (DTA) and chemical analysis. The results show that fluorine in the fluorite-bearing iron concentrate begins to escape since 400~500°C, and the emission rate of fluorine significantly increases when the temperature is above 1100°C; in the roasting process of fluorite-bearing iron concentrate, SiO₂, K₂O, Na₂O, MgO, Al₂O₃ in the gangue and water vapor in roasting atmospher react with CaF₂ in fluorite to generate such gaseous fluorides as SiF₄, KF, NaF, MgF₂, AlF₃ and HF; with the increase of roasting temperature, the emission rate of fluorine increases obviously; and the water vapor in roasting atmosphere can improve escaping of fluorine.The results provide a theoretical basis for the improvement of roasting technology to reduce fluorine emission in the roasting or sintering process of Baiyanobo iron concentrate.

Abstract: Based on the field geological survey and the previous correlational studies, remote sensing interpretation and field geological survey methods are combined and used in this study. The mineral field geological characteristics, ore body geological characteristics, wall-rock alternation and metallogenic model were analysized and summarized in the XiaChen-WangChangMu fluorite mine in TianTai basin, which is a cretaceous inherited-transition basin that has the advantageous environment riched in fluorite. The main ore-bodies are lenticular or vein-like, and the general strike of ore-body is NW trending, while the dip slip is NE or SW, lateral plunging direction mainly from northwest to southeast. The supposed ore forming process in this area is as follows: atmosphere precipitation seeps into the fracture and pores in the rock. Heated by geothermy or other heat sources, the fluoride were leached out continuously; the ore-forming fluids rise along the ore-controlling fracture during the metallogenic stage as the environment change. SiO2 is the first mineral to be precipitated, then the fluids turn from acid into weak acid, and the fluorite begins to crystallize and form the main ore body, with carbonation symbolizing the end of the mineralization.

Abstract: In view of the request of 3D visualization on mine laneway, according to traverse measurement data and profile data, by use of triangulated irregular network, the shortest dagonal method and the adjacent feature points to pace method ,using Matlab language, the 3D laneway body were established. The result shows that the method is feasible and has a simple and fast reconstruction method.

Abstract: According to the nature ofthe ore which containing hematite and magnetite,under the conditions,forexample,ore grade is 24.07%,the fitst fineness of grinding -200 mesh is 50%，thesecond fineness of grinding -200 mesh ismore than 93%, it is concluded that concentrating circuit consisting of firstgrind-Feebleness magnetic separation -high intensity magnetic separation，secondgrind-second-high intensity magnetic separation- reverse flotation .Ultimately, A concentrate with aproductivity of 18.90%，a grade of 65.21% TFe and the recovery of 51.29% was yielded.

Abstract: The ore compositions in a certain newly proven tin polymetallic ore are complicated, closely mosaic between different minerals and fine-grained disseminated. The main compositions in the ore exist mostly in the form of sulfide, and are associated partly with oxidized ore. It is difficult to separate each metallic mineral to accept qualified concentrates and ensure higher recovery rates. Aiming at characteristics and occurrences of the ore, the project emphatically selects and contrasts the test flow of selective flotation, partial bulk flotation and flotation-and-gravity-concentration, and uses effective reagent system to control the impurity contents in every concentrate, and strengthen the recovery of associated silver at the same time of producing major metallic minerals. Metallic minerals, including copper, lead, zinc, tin, sulfur and silver, can be fully recovered by adopting combined procedure of selective flotation and gravity concentration, and other associated components in the ore are also recovered comprehensively, so the technology indexes of various products obtained are excellent.

Abstract: The activation effect of ball-to-powder ratio and activation time on phosphorite ore that takes place in mechanochemical activation has been investigated in present paper, which is carried out in a planetary mill AGO-II. The results show that, particle sizes decreased after activation; the leaching rate of water-soluble P₂O₅ increased 4.6 percentage as ball-to-powder ratio rose from 8:1 to 40:1; the activated particle of samples has been highly dispersed, while the leaching rate of water-soluble P₂O₅ reached 10.1% after milling 15 minutes during activation, which was 4 times as high as the un-activated samples. The results show a potential utilization of low-medium grade phosphorite ore with mechanochemical activation directly.

Abstract: Hierarchical porous materials attract considerable attentions due to their interesting structures and superior adsorption capabilities. In this work, a novel macro- and meso-porous hierarchical material, MCM-41/diatomite, has successfully been synthesized from natural diatomite and tetraethoxysilane by basic hydrothermal method. Nitrogen adsorption/desorption isotherms, low angle XRD and SEM analysis were carried out to character the multiple porous structure and morphology of MCM-41/diatomite. The resultant compound displayed high specific surface area (862~1041 m²/g) and macro-meso-porous hierarchical structure. The morphology of MCM-41/diatomite could be various, such as worm-like, grape-like, flocky, and acaleph-like, due to different ratio between TEOS, PEG, and NaOH. Moreover, the results of adsorption experiments show that some of the resultant MCM-41/diatomite display stronger adsorption capabilities than simply mesoporous MCM-41, due to the macro-meso-porous hierarchical structure, which would further extend the application of MCM-41/diatomite as adsorbent and catalyst support.

Abstract: In this paper, the study of leaching mechanism from low-grade manganese ores by using ternary complex reductant of hydrogen peroxide, glucose and cellulose was discussed. Quantitative and qualitative analysis were conducted about original manganese and manganese slag by XRD and FTIR. XRD quantitative analysis showed that manganese content in manganese ore is about 11%; The FTIR spectra qualitatively analyzed that part broken of the C=C bond in the manganese samples leads to divalent manganese be released.

Abstract: Minor structure of coal seam has a great influence on safe and economic coal mining. It has been noticed by more and more people that the application of 3D-seismic exploration technology to solve minor structures in coal mining. In this paper, geostatistics method was adopted to solve the relativity between multi-attitude and small structures, qualitative and quantitative predicate the mine small structures, which can improve the interpretation precision, and can promote the interpreter’s efficiency, then created more economic value.

Abstract: This paper is aimed to find out the main reason of late accumulation of Kunbei area in Qaidam Basin using geochemistry and seismic data and to provide scientific evidence to the potential petroleum exploration in this area. Reservoirs in Kunbei fault terrace zone originate from petreoleum generated by source rocks of E₃² in Zhahaquan depression after N₂³(about 5.2Ma), which means a charcteristic of hysteretic hydrocarbon generation. Brine inclusions shows two hydrocarbon charging periods.The first charging most likely happens at N₁ and the second begins at N₂¹,continuing to Q.Two deformaton stages exist in the study area due to the Tibet Plateau uplifting. The accumulations of first stage have been damaged after Middle N₁. The reservoirs of Kunbei zone at present are almost orignated from E₃² in depression. Above all,the primary cause of late accumulation is due to long-distance effects of the Tibet Plateau uplifting.