Advanced Materials Research Vol. 813

Abstract: The ore samples which contained 1.15% Cu were selected from one copper oxide ore in Guizhou. The oxidation rate of copper mineral was up to 83.48%. The run-of-mine ore characters were thorough studied. On the basis of the analysis of raw ore properties, the copper concentrate with grade above 22.1% and recovery of 88.52% were obtained by using a new type of highly efficient compound collector and the process flows with one roughing-two cleaning-two scavenging.

Abstract: The results of research of environmental and social security of tin processing toxic waste stored in the tailing ponds are shown. To reduce the negative environment impact the necessity to develop the measures, including restoration of mining disturbed land, was substantiated.

Abstract: Estimation of the effect of hypergene and technogene processes proceeding in the ore bodies of the mining excavations and the tailings of the old tailing dump of the Krasnorechenskaya concentrating mills of Dalnegorsk district showed that mineralization of solutions in all modeling systems is high. This allows the hypergene minerals to be crystallized from the solutions. The solutions form the mine and drainage waters, in which the content of sulfide elements is tens, hundreds, thousands, and even tens of thousands times higher than the background characteristics.

Abstract: In this paper, mineralogical phase transformations of Indonesia nickel laterite ores are studied during calcinations, the thermodynamics of process are also investigated. Different factors that affect the reduction of the laterite ores are tested and analyzed by Differential Scanning Calorimeter (DSC), X-ray Diffraction (XRD), Brunauer Emmett Teller (BET) and Scanning Electron Microscope (SEM). The results show that during calcination process, goethite is dehydrolyzed by removing structural water at about 300°C, which then transforms to hematite, and serpentine decomposes at around 600~700°C, leading to formulate olivine if agglomerating at higher temperature. By thermodynamics calculation, the goethite dehydration temperature is under 100°C, and about 200°C for serpentine decomposition. It might be the inclusions in ore which make laterite become hard to decompose.

Abstract: This work examines the recovery of magnesium from desiliconization slag of nickel laterite ores by carbonation process. The effects of reaction temperature, reaction time, liquid/solid ratio and CO₂ flow rate on magnesium dissolution are investigated. The optimized experimental conditions of recovering magnesium were gained by the analysis of orthogonal experiments.

Abstract: The samples belong to low grade siliceous collophanite. Main useful mineral is cellophane and main gangue minerals are quartz , calcite and dolomite. The grade of P₂O₅ is 21.98% and the grade of SiO₂ is 31.34%. Through the straight-reverse flotation, the phosphate concentrates with a grade of 27.68% and the recovery of 83.04% were obtained. The content of MgO is 0.92% in phosphate concentrates.

Abstract: To determine the safe distance between spreader and the upper verge of dump slope, a 2D and 3D slope model was built respectively, the limit equilibrium method and the finite element method with shear strength reduction technique (FEM-SSR) were introduced to analyze the stability of the spreader. For the slope under the action of variable external loads, the simple genetic algorithm (SGA) sometimes fails to converge to the global optimum, for this reason, an improved optimum maintaining simple genetic algorithm (OMSGA) was utilized to search for the critical slip surface, and the probability of the global convergence was improved greatly. On the basis of the three-dimensional elastic-plastic finite element model of the dump slope, the minimum sinkage of spreader track which interferes the spreaders normal operation was taken as the criterion to determine the safety factor, according to this idea, the deformation in the elastic stage during the process of strength reduction was considered, and a more reliable safety factor by the variable stiffness method was obtained.

Abstract: For a nickel oxide ore, 1^# ore sample was treated by sulfuric acid leaching and 2^# ore sample was treated by ammonium sulfate roasting-sulfuric acid leaching through exploring experiments. The leaching rate of 92.04% with l^# nickel oxide ore and the leaching rate of 72.36% with 2^# nickel oxide ore were obtained by conducting the conditional experiments of sulfuric acid concentration, leaching time, ammonium sulfate dosage and so on.

Abstract: During recent years, various researches have been done to improve combustion process and through that, increasing the fuel economy of diesel engines of heavy truck. However, the controlled thermal management system has not been significantly employed for further reduction of specific diesel oil consumption and increase of truck mileage. Approximately 30% of fuel supplied energy is rejected to the ambient via cooling system which place massive demands for advanced design cooling systems to realize greater engine thermal efficiency. Advanced thermal management system can reduce the fuel consumption, pollutant emissions, warm up time, and enhance overall engine performance. This paper presents a control strategy which enhances the operational performance of the diesel truck using thermal management on two different real driving cycles. Firstly, the cooling system model was validated with experimental data, and then replaced with an advanced controlled thermal management system using a 1-D simulation model. A parametric study is performed using the developed model to examine the effects of advanced control thermal management system on the truck performance. The criteria for selecting the optimum pump speed, fan speed and the valve lift depend on the real truck thermal state to minimize parasitic and pumping losses and the total amount of heat rejected to the ambient. The analysis of the preliminary results indicates that the controlled strategy can reduce the parasitic losses, enhance fuel economy and reducing packing requirements.

Abstract: Haoyaoerhudong gold deposit is located in Inner Mongolia Wulate county. We analysis the characteristics of fluid composition. Salinity values range is from 3.40% to 20.40%; The density of the fluid is from 0.68 to 0.97 g/cm3;Ore-forming pressure is from 11.44 to 58.42MPa;According them, We can separate the fluid into Quartz-pyrite stage, Ore-forming fluid is divided into four stages in Haoyaoerhudong gold deposit. It is quartz calcite phase, the late stage of quartz vein, quartz polymetallic sulfide phase and quartz Pyrite phase. Quartz polymetallic sulfide phase and quartz Pyrite phase is the main metallogenic period in Haoyaoerhudong gold deposit.