In this paper we put forward a new concept——the ore of associated gain element. It is thought that the theoretical index forecast of dressing and smelting should be the component part of contents of technological mi...In this paper we put forward a new concept——the ore of associated gain element. It is thought that the theoretical index forecast of dressing and smelting should be the component part of contents of technological mineralogy study. The relative problems of the representativeness of ore sample, the handling of study sample and the choice of test means, and the examination of element existance form in the ore, etc., are discussed.展开更多
Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore.An oolitic hematite ore was roasted using suspension roasting technology at different temperatures.The phase tr...Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore.An oolitic hematite ore was roasted using suspension roasting technology at different temperatures.The phase transformation for iron minerals was investigated by XRD and Mossbauer spectrum,and the characteristics of roasted product were analyzed by VSM and SEM-EDS.Results indicate that the magnetic concentrate is of 58.73% Fe with iron recovery of 83.96% at 650 °C.The hematite is rapidly transformed into magnetite during the roasting with transformation ratio of 92.75% at 650 °C.Roasting temperature has a significant influence on the phase transformation of hematite to magnetite.The transformation ratio increases with increased temperature.After roasting,the magnetic susceptibility is significantly improved,while iron ore microstructure is not altered significantly.展开更多
With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the re...With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the requirements-tasking-effectscycle from one day to hours, the various resources of the wholedata acquisition chain （including satellites, ground stations, dataprocessing centers, users, etc.） should be taken into an overallconsideration, and the traditional batch task planning mode shouldbe transformed into the user-oriented task planning mode. Consideringthere are many approaches for data acquisition due tothe new techniques of ORS satellite, the data acquisition chaintask planning problem for ORS satellite can be seen as the multimodalroute planning problem. Thereby, a framework is presentedusing label-constrained shortest path technique with the conflictresolution. To apply this framework to solve the ORS satellite taskplanning problem, the preprocessing and the conflict resolutionstrategies are discussed in detail. Based on the above work, theuser-oriented data acquisition chain task planning algorithm forORS satellite is proposed. The exact solution can be obtainedin polynomial time using the proposed algorithm. The simulationexperiments validate the feasibility and the adaptability of the proposedapproach.展开更多
Currently there have been formed industrial uranium deposits in Kyzylkum province that refer to three types of formations—exogenetic uranium formation in the sediments of Mesozoic-Cenozoic cover,endogenic molybdenum-...Currently there have been formed industrial uranium deposits in Kyzylkum province that refer to three types of formations—exogenetic uranium formation in the sediments of Mesozoic-Cenozoic cover,endogenic molybdenum-uranium formation and polygenic molybdenum-uranium-vanadium formation in carbon-siliceous shale formations ("black-shale"type).Carbon-siliceous shales are展开更多
Bolshetagninskoe deposit is one of the most important Russia niobium potential sources. It is confined to carbonatite complex of the same name that is situated in the Sayan Mountains, Eastern Siberia. In the result of...Bolshetagninskoe deposit is one of the most important Russia niobium potential sources. It is confined to carbonatite complex of the same name that is situated in the Sayan Mountains, Eastern Siberia. In the result of VIMS exploration niobium ores reserves have been applied by Russian State Reserve Committee in 2012 year. Ores contain about 1% Nb2O5 and are unique in that the economic pyrochlore mineralization is concentrated in alkaline metasomatic rocks but not in carbonatites[1]. During exploration 47 borehole samples and 6 bulk samples were collected and studied by process mineralogy techniques (optic mineralogical analyze, optic image analyzer system, XRD, EPMA). 26 borehole samples and 2 bulk samples were tested by rougher floatation to define geometallurgical items and to understand the ore’s behavior. Four volumetric samples have been tested by commissioned flowsheet (radiometric separation → impact milling → selective floatation → pyrochlore leaching → ferroniobium). There are three ore types in the Bolshetagninskoe deposit: microcline-pyrochlore (MP), biotite-columbite-pyrochlore (BCP) and carbonate-pyrochlore (CP). MP type is the most important one. MP ore consists of microcline (59wt%–70wt%) with minor carbonates, apatite, sulfides, goethite. Pyrochlore, the essential Nb mineral (94% of ore Nb content), occurs as fine grains (weighted average grain size is 57 μn). Since pyrochlore grains are fine and friable, the ore preparation size and method is a main problem of its treatment. While primary ore processing is effective to remove about 30% waste material it is important to evaluate its influence on floatation feed grade.展开更多
Graphite and graphite-like materials widely are present at black shale and magmatic ores. The nature of these carbon materials (CM) is multifarious. In what cause connects a mineralization with carbon. The great numbe...Graphite and graphite-like materials widely are present at black shale and magmatic ores. The nature of these carbon materials (CM) is multifarious. In what cause connects a mineralization with carbon. The great numbers of parameters, namely, the temperature, the pressure, the shear stress, the catalytic species, the host-rock lithology, the time and etc., have an influence on the graphitization process. Accumulations of gold and platinum group elements in black graphite shale and extraction of these metals from rocks depend in considerable degree from structural properties of CM. Raman spectroscopy has wide applied for various carbon modifications, including nano-structuring materials. The first and second-order Raman spectrum have been correlated with changes in the structure of graphite. There is a linear relationship between temperature and Raman R2 and R1 parameters (derived from the area and intensity of the defect band (D) relative to the ordered graphite band (G), respectively). The purpose of the present study is to characterize the rocks and CM from carbon-rich rocks of gold-ore deposits of the black-shale formation and magmatic ores using micro-Raman spectroscopy technique (Horiba Jobin Ivon LabRam spectrometer). Exciting was performed with 325 nm line of He-Cd laser. The graphite and graphite-like samples from many ore deposits of Russia and Kazahstan are investigations. R1 and R2 ratio indicate variable degree of organisation CM in the samples. The results show different spectral variations of CM with metamorphic grade: the well-ordered graphite from magmatic rocks, more - ordered and the disordered less graphitized CM from black-shale ores. For the first time in the world practice the Raman spectroscopy technique has been applied to determine the temperature of graphitizing for CM at gold-ore deposits of the black-shale formation. The temperatures obtained on carboniferous substance for the gold deposits range from 405°С to 280°С. Temperature of CM formation from Pt-low sulphide ores of the Talnakh deposit ranges from 4700C to 6500C. It has been shown that the carbon-rich phases from black-shale and magmatic rocks have various degrees of graphitization and different carbon forms.展开更多
The Influence of pulp pH, dispersants and auxiliary collectors on reverse flotation of carbonate-containing iron ores were explored. Interactions between iron ores and quartz were theoretically analyzed by flotation s...The Influence of pulp pH, dispersants and auxiliary collectors on reverse flotation of carbonate-containing iron ores were explored. Interactions between iron ores and quartz were theoretically analyzed by flotation solution chemistry and DLVO theory. The results indicated that the iron concentrate grade improved sharply when pH increased from 11.0 to 12.0, but changed unobviously when pH was larger than 12.0, which was related to solution chemistry of siderite and interactions among particles. Sodium tripolyphosphate was an effective dispersant and sodium dodecyl sulfate was an effective auxiliary collector of KS-III. Both recovery and grade enhanced by the action of sodium dodecyl sulfate or sodium tripolyphosphate when pH was 12.0.展开更多
文摘In this paper we put forward a new concept——the ore of associated gain element. It is thought that the theoretical index forecast of dressing and smelting should be the component part of contents of technological mineralogy study. The relative problems of the representativeness of ore sample, the handling of study sample and the choice of test means, and the examination of element existance form in the ore, etc., are discussed.
基金Project([2011]01-69-07)supported by the China Geological Survey Project
文摘Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore.An oolitic hematite ore was roasted using suspension roasting technology at different temperatures.The phase transformation for iron minerals was investigated by XRD and Mossbauer spectrum,and the characteristics of roasted product were analyzed by VSM and SEM-EDS.Results indicate that the magnetic concentrate is of 58.73% Fe with iron recovery of 83.96% at 650 °C.The hematite is rapidly transformed into magnetite during the roasting with transformation ratio of 92.75% at 650 °C.Roasting temperature has a significant influence on the phase transformation of hematite to magnetite.The transformation ratio increases with increased temperature.After roasting,the magnetic susceptibility is significantly improved,while iron ore microstructure is not altered significantly.
基金supported by the National Natural Science Foundation of China(6110118461174159)
文摘With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the requirements-tasking-effectscycle from one day to hours, the various resources of the wholedata acquisition chain （including satellites, ground stations, dataprocessing centers, users, etc.） should be taken into an overallconsideration, and the traditional batch task planning mode shouldbe transformed into the user-oriented task planning mode. Consideringthere are many approaches for data acquisition due tothe new techniques of ORS satellite, the data acquisition chaintask planning problem for ORS satellite can be seen as the multimodalroute planning problem. Thereby, a framework is presentedusing label-constrained shortest path technique with the conflictresolution. To apply this framework to solve the ORS satellite taskplanning problem, the preprocessing and the conflict resolutionstrategies are discussed in detail. Based on the above work, theuser-oriented data acquisition chain task planning algorithm forORS satellite is proposed. The exact solution can be obtainedin polynomial time using the proposed algorithm. The simulationexperiments validate the feasibility and the adaptability of the proposedapproach.
文摘Currently there have been formed industrial uranium deposits in Kyzylkum province that refer to three types of formations—exogenetic uranium formation in the sediments of Mesozoic-Cenozoic cover,endogenic molybdenum-uranium formation and polygenic molybdenum-uranium-vanadium formation in carbon-siliceous shale formations ("black-shale"type).Carbon-siliceous shales are
文摘Bolshetagninskoe deposit is one of the most important Russia niobium potential sources. It is confined to carbonatite complex of the same name that is situated in the Sayan Mountains, Eastern Siberia. In the result of VIMS exploration niobium ores reserves have been applied by Russian State Reserve Committee in 2012 year. Ores contain about 1% Nb2O5 and are unique in that the economic pyrochlore mineralization is concentrated in alkaline metasomatic rocks but not in carbonatites[1]. During exploration 47 borehole samples and 6 bulk samples were collected and studied by process mineralogy techniques (optic mineralogical analyze, optic image analyzer system, XRD, EPMA). 26 borehole samples and 2 bulk samples were tested by rougher floatation to define geometallurgical items and to understand the ore’s behavior. Four volumetric samples have been tested by commissioned flowsheet (radiometric separation → impact milling → selective floatation → pyrochlore leaching → ferroniobium). There are three ore types in the Bolshetagninskoe deposit: microcline-pyrochlore (MP), biotite-columbite-pyrochlore (BCP) and carbonate-pyrochlore (CP). MP type is the most important one. MP ore consists of microcline (59wt%–70wt%) with minor carbonates, apatite, sulfides, goethite. Pyrochlore, the essential Nb mineral (94% of ore Nb content), occurs as fine grains (weighted average grain size is 57 μn). Since pyrochlore grains are fine and friable, the ore preparation size and method is a main problem of its treatment. While primary ore processing is effective to remove about 30% waste material it is important to evaluate its influence on floatation feed grade.
文摘Graphite and graphite-like materials widely are present at black shale and magmatic ores. The nature of these carbon materials (CM) is multifarious. In what cause connects a mineralization with carbon. The great numbers of parameters, namely, the temperature, the pressure, the shear stress, the catalytic species, the host-rock lithology, the time and etc., have an influence on the graphitization process. Accumulations of gold and platinum group elements in black graphite shale and extraction of these metals from rocks depend in considerable degree from structural properties of CM. Raman spectroscopy has wide applied for various carbon modifications, including nano-structuring materials. The first and second-order Raman spectrum have been correlated with changes in the structure of graphite. There is a linear relationship between temperature and Raman R2 and R1 parameters (derived from the area and intensity of the defect band (D) relative to the ordered graphite band (G), respectively). The purpose of the present study is to characterize the rocks and CM from carbon-rich rocks of gold-ore deposits of the black-shale formation and magmatic ores using micro-Raman spectroscopy technique (Horiba Jobin Ivon LabRam spectrometer). Exciting was performed with 325 nm line of He-Cd laser. The graphite and graphite-like samples from many ore deposits of Russia and Kazahstan are investigations. R1 and R2 ratio indicate variable degree of organisation CM in the samples. The results show different spectral variations of CM with metamorphic grade: the well-ordered graphite from magmatic rocks, more - ordered and the disordered less graphitized CM from black-shale ores. For the first time in the world practice the Raman spectroscopy technique has been applied to determine the temperature of graphitizing for CM at gold-ore deposits of the black-shale formation. The temperatures obtained on carboniferous substance for the gold deposits range from 405°С to 280°С. Temperature of CM formation from Pt-low sulphide ores of the Talnakh deposit ranges from 4700C to 6500C. It has been shown that the carbon-rich phases from black-shale and magmatic rocks have various degrees of graphitization and different carbon forms.
文摘The Influence of pulp pH, dispersants and auxiliary collectors on reverse flotation of carbonate-containing iron ores were explored. Interactions between iron ores and quartz were theoretically analyzed by flotation solution chemistry and DLVO theory. The results indicated that the iron concentrate grade improved sharply when pH increased from 11.0 to 12.0, but changed unobviously when pH was larger than 12.0, which was related to solution chemistry of siderite and interactions among particles. Sodium tripolyphosphate was an effective dispersant and sodium dodecyl sulfate was an effective auxiliary collector of KS-III. Both recovery and grade enhanced by the action of sodium dodecyl sulfate or sodium tripolyphosphate when pH was 12.0.
