Abstract: Diesel fuel fire experiments were conducted in NIOSH’s Pittsburgh Research Laboratory’s (PRL) Safety Research Coal Mine (SRCM) to determine the critical air velocity for preventing smoke rollback. Such information is necessary for the preplanning and implementation of ventilation changes during mine fire fighting and rescue operations. The fire intensity varied from 50 kW to 300 kW depending upon the fuel tray area. Airflow in the 2 m high and 2.9 m wide coal mine entry was regulated during the course of each experiment; measured upwind from the fire as an average over the entry cross-section with an ultrasonic airflow sensor; and recorded dynamically with a mine monitoring system. The extent of smoke reversal was monitored with light obscuration monitors, ionization smoke sensors, and visual observations. Experimental results for the critical air velocity for smoke reversal as a function of fire intensity compared very well with model predictions based upon a computational fluid dynamics (CFD) fire dynamics simulator.

Abstract: Most discussions of sustainable development (SD) in mining relate to metal mines in rural areas. Industrial minerals (IM) are closer to urban areas primarily owing to a high transport-cost component of delivered cost. This visibility to large populations overshadows IMs relatively small operation size and generally lower waste volume and toxicity. The IM industry needs to rethink its way of doing business to fit into the SD paradigm. Society and business in general will also undergo significant change to enable industrial SD along the lines of triple-bottom-line accounting with government pushing everyone. The benefit to IM mining from embracing SD is a renewal in their social license to operate and a rebirth of mining as a positively-viewed force in society. This positive view would lead to lower acquisition costs because society would not fight so hard to eliminate nearby mining. This would ease the current exploration woes of the IM industry by opening up new deposits for exploration and more readily allowing placement of mines nearer to markets. The earlier in the exploration process SD is initiated, the better.

Abstract: The cyanided tailings from gold ore dressing plant contains many recoverable metallic elements such as Au,Ag,Cu,Pb.The recovering of these elements will not only increase economic profit of mine but also reduce environmental pollution.

Abstract: The mining industry recognizes the importance of engineering controls as a primary means of preventing hear­ ing loss.The noise-control treatments most commonly observed on drills and bolters during this study were windshields, sound-absorbing mate­ rial and hydraulic motor covers. These controls were evaluated on machines at underground metal mines to determine the amount of noise reduction achieved by each control.The results indicate that absorb­ ing material has very little effect on the noise level. The noise reduction attributable to the motor covers was dependent on the material used to create the cover. Properly installed windshields were the most consistent control. Introduction/background Noise-induced hearing loss is now the most common occupational illness in the United States, with 30 million workers exposed to excessive noise levels (NIOSH, 1996). This is of particular concern to the mining industry, where many workers are exposed to damaging noise levels. As a result, approximately 90 percent of coal miners and nearly 70 percent of metal/nonmetal miners exhibit a hearing disability by age 50 (Franks 1996, 1997). One of the many reasons for the prevalence of hear­ ing loss is the lack of successful engineering noise con­ trols for the equipment used in the underground mining industry. The relatively small market for mining equip­ ment, combined with the unique requirements imposed by the sometimes-hostile mining environment, has lim­ ited manufacturer innovation and the transfer of tech­ nology from other industries. Fortunately, the mining industry has recognized the importance of engineering noise con­ trols as a primary means of reducing noise exposure and preventing noiseinduced hearing loss among mine workers. Even though a lack of readily available proven control technology has hindered the imple­ mentation of controls, potential noise-control solutions are being crafted and tried at the mine level by mine workers, operators, manufac­ turers, consultants and government personnel. A downside to this initiative is that in an attempt to reduce worker noise exposure, many operators in­ stall noise treatments without know­ ing how much noise reduction to expect from the treatment before installation or how much noise re­ duction is actually achieved after in­ stallation. In some cases, due to improper material selection, placement or installation, little to no sound reduction occurs after the ap­ plication of noise treatments. In other cases, noise treatments are applied when the source sound level does not warrant treatment, thus wasting valuable resources. Not only do unsuccessful noise controls cost the industry time and money, they also do nothing to decrease the equipment operator’s risk of noiseinduced hearing loss. Approach A short-term goal of the U.S. National Institute for Occupational Safety and Health (NIOSH) is to identify possible noise-control solutions that are being applied to pieces of machinery and to characterize the noise re­ ductions attributed to those controls. In addition to lo­ cating and assessing existing controls, NIOSH is also identifying processes or machines in need of noise con­ trols, identifying gaps in technology that impede the use of noise controls and identifying bar­ riers to the use of noise controls, in­ cluding collateral hazards. To commence this task, NIOSH sur­ veyed seven underground metal mines in the western part of United States that had installed noise con­ trols on pieces of mining equipment. During the course of the study, noise controls installed on locomo­ tives, haul trucks, face drills, roof bolters and load-haul-dumps (LHD) were evaluated using several acous­ tical-measurement techniques. The results can be used by the industry as a guide to focus noise reduction and hearing-conservation efforts on controls that show the most prom­ ise. Space does not permit reporting all of the findings from all of the equipment tested, and space does not permit reporting all the results from each measurement technique to be presented here. Therefore, only the sound-level results of the machines with the most installed engineering controls, specifically the jumbo face drills and roof bolters, are discussed. The remainder of the findings will be published elsewhere, but a summary of all of the acoustical techniques used is presented below. FIGURE 1 Two-channel sound level measurement. FIGURE 2 Sound-intensity measurements. Methods To determine the actual amount of noise attenuation achieved by each applied noise control at the machine-operator position, several acoustic measurement techniques were used take measurements both with and without the noise-control treatments in place. Sound-level and sound-intensity measurements were performed using Bruel & Kjaer (B&K) 2260 Investigators Running Enhanced Sound Analysis and Sound Intensity software, respectively. The B&K Investigator is a precision Type I instrument (ANSI S1.4) that has a tolerance of 1 dB between 500 and 4,000 Hz. Noise exposure was measured using a Quest Q-400 Noise Dosimeter. The Quest Q-400 is a single microphone, dual-channel device that allows for the simultaneous measurement of noise using two different evaluation criteria.

Abstract: Membrane bioreactor(MBR) based on intensified biochemical reaction is a new technology of wastewater treatment,possessing advantages of high-rate of pollutant removal and low-generation of mud.The forms and characteristics of recent MBRs and their problems in application are summarized and analyzed,and suggestions for improvement are made.A test is made which shows how MBR is used in practice.

Abstract: The coarse grain size and small specific surface area of Chengchao iron ore concentrate influence negatively the output and quality of pelletAfter introduction of high-pressure roll press,the quality of pellet is improved remarkably and the smooth and stable running of grate-rotary kiln is ensured

Abstract: This paper narrates the source,distribution and hazard of the acid mine drainageIt analyses and summarizes the present status of the economical and practical technology of treating acid mine drainage such as modification of mineral dressing flow,neutralization method,sulfuration method,displacement neutralization method,etcThe paper also further expounds the developmental prospects of the technology of treating acid mine drainage

Abstract: Factors influencing since long time the price of China's iron ore final products are analyzed.On this basis, a reasonable price of iron ore final products is recommended that should be taken into financial evaluation list for investment project of an iron ore mine.

Abstract: General status of development of direct reduction technology is summarized.Equipment and their operation used in Midrex,HYL III,Finmet and DryIron direct reduction technologies are introduced.On this basis,the latest progresses and development trend of direct reduction technology in the world are discussed.

Abstract: As viewed from stratum,structure,magma activity,ancient geographic lithofacies and source of ore body forming materials,the features regularities of formation of Huize lead-zinc ore body are analyzed.The decision is that Huize lead-zinc ore body is a hot water sediment—dynamically reformed superposition ore body formed through multiple phases stages and due to many reasons.

Abstract: Based on explanation of position,role and recent status of non-ferrous mining industry in China's national economy,the problems such as shortage of resources,backward technology,small size of enterprise,unreasonable structural organization,high energy consumption and serious pollution are discussed and some measures for improvement are suggested.

Abstract: The industrial test using combination of two-stages continuous grinding,middling re-grinding,gravity separation,high-intensity magnetic separation and anionic reverse flotation has been done in Guanbaoshan Mine with satisfactory results.The flowsheet has been proven advanced and practicable.

Abstract: This paper analyes the shortcomings of (1～9)scale process on determining the weight value of multi-objective decision-making for mining method selection and presents (0,1,2)scale process to determine the weight value ,which can reduce and avoid the error of weight value coming from the experts subjective causes.Basing on objective data,the evaluation matrix is constructed and finally an example is given to show the effectiveness and reasonableness of the method.

Abstract: The features and functions of software Dreamweaver for design of Web Pages are introduced.At the same time, the characteristics of HTML Language and CSS Format and their application in Web Pages are explained.

Abstract: The geological conditions,mining history,and actual status of surface subsidence in Beiminghe Iron Ore Mine is explained in brief.On this basis,the reasons causing surface subsidence are analyzed.

Abstract: The research actuality of using bentonite for the disposal of heavy metal wastewater at home and abroad was introduced.The modification methods of bentonite were discussed.The effects, affecting factors,mechanism and isotherm of bentonite adsorption on heavy metal were generalized.In addition,the development tendency and application prospects of bentonite in disposal of heavy metal wastewater were forecast.