Advanced Materials Research Vols. 1073-1076

Abstract: Transient electromagnetic method is one of the geophysical prospecting methods to detect mine goaf. The paper analyzes the unique electrical characteristics of the stratum containing goaf. TEM inverts the apparent resistivity and delineates the mine goaf and determines water content by observing the pure secondary field. The method is sensitive to geologic bodies of low resistivity and has higher resolution. The paper takes some one mine in Shanxi as example to prove the practicability and effectiveness of TEM in production. It has certain reference significance in detecting mine goaf.

Abstract: In order to utilize the unclassified tailings and reduce the cost of backfill in Jinchuan mine, compressive strength experiments were conducted by taking unclassified tailings as aggregating material. The influence of unclassified tailings on compressive strength was studied, and the influence of unclassified tailings on Hydration products and microstructures was analyzed by XRD and SEM also. The results show that the fine particle size and higher mud content of unclassified tailings have adverse effect on early strength, especially on 3d compressive strength, but it can mprove the long-term strength. The hydration products of the new backfill cementitious materials is mainly C-S-H gel, the flocculent C-S-H gel form dense gel-structure and bond the aggregates together form the high mechanical strength. With the new backfill cementitious materials can achieve 30% utilization of unclassified tailings in Mine Filling, and attained the goal of reducing backfill costs and protecting the environment.

Abstract: As the zinc minerals of easy separation drying up, efficient utilization of refractory zinc oxide ores is getting more and more attention, especially for siliceous zinc oxide ore is quite difficult to separate, and it is a challenge for worldwide mineral processing industry. This article mainly used the density functional theory and X-ray photoelectron spectroscopy to study the adsorption mechanism of amine collectors on hemimorphite, when the composite activator was working.

Abstract: The test researched the influence of layered coke charging, sandwich clamping coke charging and central coke charging with edge delaminating on the development of carbon solution reaction in shaft and the reduction of the iron-bearing burden on the condition of the same proportion of high and low reaction coke. It showed that the reduction degree of the layered type coke distribution is the best, and the loss of carbon solution is the minimum using the same proportion of high reaction coke and low reaction coke. Compared with the other two type coke distribution, the layered type coke distribution is promising to increase reaction efficiency in blast furnaces and decrease the energy consumption of blast furnace melting.

Abstract: Aimed at the frequency gas accident of coal mine, we designed a coal mine gas monitoring system based on Arduino microcontroller. The MQ-4 gas sensor was used to collect gas concentration, wireless ZigBee was used to transfer data of gas concentration to PC. The system can display gas concentration real-timely by LCD and use SD card to store the data. The system will send out sound and light alarm when the gas concentration overruns. Industrial tests have been carried out in Wuyang coal mine. Results show that gas monitoring system can well adapt to environment of underground coal mine and the measurement is accurate. The system is real-time monitoring and early warning. It has the characteristics of low power consumption, low cost, wireless, good market prospect.

Abstract: In order to enhance the quality of iron concentrate from magnetic separation, reverse-flotation technology is often applied in iron ore dressing plant. However, this technology has disadvantages in operating cost, energy consumption and environmental protection (Zhao Chunfu, Wu Jianghua &Wang Hui ,2005). Developing innovative equipment to process magnetite ore more-effectively is a way to get rid of these disadvantages of reverse flotation and improve the quality of iron concentrate. This paper describes the development of Complex Flashing-Field Magnetic Cleaner, a new kind of equipment based on the principle of combination of separation in magnetic field and separation in gravity field (Hao Shuhua & Jiang Wenli,2002). This innovative equipment possesses a tailor-made magnetic system and has the characteristics of a magnetic field which can strengthen the formation of magnetic agglomerations and the dispersion of gangue minerals to improve the quality of separation. The automatic control system developed specifically for this equipment can further increase the accuracy of separation and stabilize the process. Test results showed that this equipment is reliable in operation, economically beneficial and it has large potential of application.

Abstract: Coal gas is a key factor in coal mine production safety, gas outburst and other threats can cause suffocation mine operating personnel, damage to human health, the gas reaches the ignition and combustion gases can cause encountered gas and coal dust explosion; while the main gas or the Earth's atmosphere sources of pollution. Therefore, effective governance gas to gas as a resource to achieve coal and gas extraction, to eliminate sudden end, and take advantage of the gas, reducing its air pollution is a major issue in the field of coal mining, the paper gas utilization, gas drainage aspects of mining, mine gas drainage system briefly described.

Abstract: SAGD dynamic temperature and pressure monitoring technology can be used to detect multi-point temperature and pressure in production well, determine liquid state, accurately identify the movement direction of steam and breakthrough position so that it can effectively guide SAGD production and reduce operation costs, thereby significantly improve heavy oil recovery.

Abstract: In this paper, the indexes have been determined for identifying ineffective injection-production circulation and corresponding mathematical model was constructed with fuzzy theory. Application examples show that this method is simple, fast and accurate. For high and extra-high water cut oilfields, because of the long-term erosion of injected water, there are some high penetrative channels between the injection and production wells, resulting in most injected water along the channel to cause the invalid injection and production, for which it is hard to increase water flooding swept volume, causing flooding and high water cut well and reducing oil production. To improve the effectiveness of water injection to achieve stable yields, it is important to take the measures of ineffective injection-production wells profile control, plugging and so on for fast and accurate identifying ineffective injection-production wells. To that end, this paper applied fuzzy theory to establishing the mathematical model for identifying ineffective injection-production wells.

Abstract: Conventional drip irrigation systems are working under constant working pressure, but the core component emitter is prone to clogging. Round-flow emitter is selected as the research object. Computational fluid dynamics software FLUENT 6.3 is applied to simulate the hydraulic performance of the round-flow emitter under the condition of vibration pressure. Vibration modes are selected as the sine waveform, triangular waveform and rectangle waveform. Three vibration parameters such as basic pressure, vibration period and vibration amplitude are taken as the factors to design the orthogonal experiment. Simulation results show that, water fluctuation and energy dissipation of round-flow emitter in vibration mode are better than that of constant pressure. The combination of basic hydraulic pressure 8m, vibration period 72s, vibration amplitude 6m is the optimal vibration parameters. The research of this paper provides a certain reference for selecting the vibration parameters of the vibration mode.