淮北下组煤底板灰岩水现状及防治措施

在对淮北煤田几对生产矿井资料研究的基础上,分析了下组煤底板灰岩水充水因素及其突水的可能性,表明灰岩水对淮北煤田安全开采有着重大的威胁,提出了灰岩水突水防治措施,同时也指出了目前矿井突水预防理论及措施上存在的不足。     

Hydrogeochemistry and Quality Assessment of Mine Water of West Bokaro Coalfields,Hazaribag, Jharkhand,India

A total of 33 samples of mine water discharges from the different mines of West Bokaro Coalfields of Hazaribag district of Jharkhand, India, were analyzed to carry out qualitative assessment and suitability for domestic, irrigation and industrial purposes. The electrical conductivity （EC） for measured samples and spatial differences reflects the wide variation in lithology, surface activities and hydrological regime prevailing in the region. The anion chemistry shows the dominance of SO42- and HCO3 with minor contribution from CI, NO3 and F. The cation chemistry indicate that 79% of the samples are Ca 〉 Mg 〉 Na 〉 K, while the 6% belong to Ca 〉 Na 〉 Mg 〉 K and 1% of Ca 〉 Mg 〉 K 〉 Na. Concentrations of some heavy metals （Fe, Mn, Ni, Cr） are found to be well above the prescribed permissible levels recommended for the drinking water. The water quality assessment for drinking purposes indicate that most of the mine water having high TDS, total hardness （TH） and sulphate concentrations, suggests that mine water of the study area is not suitable for direct use in drinking and domestic purposes. The mine water can be used for irrigation purposes; however, high values of salinity, %Na, SAR, RSC and Mg-hazard at certain sites restrict its suitability for agriculture uses.     

A Survey of Ferruginous Minewater Impacts in the Welsh Coalfields

The aim of this study was to locate all ferruginous discharges within the Welsh coalfield areas and to assess their impact upon receiving watercourses. The project was undertaken in two stages. In the first stage, visual assessments were carried out on an area of river bed affected by iron hydroxide deposition. Chemical samples of the discharges and the receiving watercourse were analysed for a suite of physico-chemical determinands. Ninety discharges were located impacting upon 59.4 km of river, and an area of 22 ha was affected by iron hydroxide deposits.
A ranking method, incorporating the physical/chemical determinands, was developed to assess the comparative impact which discharges were having on receiving watercourses. A total of 33 of the top ranked discharges- (20 to classified watercourses and 13 to unclassified watercourses) having the highest environmental impact were selected; chemical, biological and fisheries impact assessments were then carried out on these discharges in the second stage of the project. The sites were then ranked on the basis of biological and fisheries impact. A list of the highest impacted sites was produced, and some of these were further investigated for remediation options and associated costs.     

Rare earth elements in flotation products of coals from East Kootenay coalfields,British Columbia

With the identification of coal deposits that are enriched in rare earth elements (REEs) across the world, coal and coal by-products are considered as an alternative source for REEs due to the combined supply and demand restrictions for these elements. Studies are being conducted to recover these elements from various coal sources. In this study, coal samples from the East Kootenay coalfields in British Columbia, Canada were examined for the presence of REEs in run-of-mine coal samples and flotation products.Results reveal that on an ash basis, the concentration of REEs varies from 174 to 1038 mg/kg in the samples. To understand the REE as sociation, which is essential for extraction purposes, a three-step sequential extraction process along with a mineralogical evaluation using scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX) and quantitative X-ray diffraction (XRD) data was used. It is found that a significant portion of REEs in the feed samples were reported to middling and tailings streams. The mineralogical analyses reveal REE association with aluminosilicate mineral in the samples.     

Technology of groundwater reservoir construction in goafs of shallow coalfields

In exploiting shallow coal resources in western China, conservation of water resources is often subjugated to considera-tions of safety and production in coal mines. In order to maintain a sustainable development in the Shenfu-Dongsheng coalfield, we propose a technology of constructing groundwater reservoirs in goals in shallow coalfields to protect fragile ecological environ-ments. Given the premise of safe production, we selected an appropriate goal as the site for constructing a groundwater reservoir and used a mine water recharge technique in combination with other related techniques for effective water conservation. Then fil-tering and purification techniques were used to purify the mine water given the physical and chemical properties of mine water and its filling material, ,thereby greatly reducing suspended matter, calcium and other harmful ions in the water. With the potential of widely application, the research result has been successfully applied in the Daliuta coal mine, to great economic and ecological effect. Therefore, this achievement provides a new way for mine water conservation in shallow coal resources in western China.     

HIGH-RESOLUTION SEQUENCE STRATIGRAPHIC ANALYSIS OF THE PERMIAN IN THE WESTERN SHANDONG AND HUAINAN-HUAIBEI COALFIELDS

The sedimentary characteristics and their combination succession of the Permian in the Shandong and Huainan-Huaibei coalfields are analyzed. The mid- and short-term stratigraphic base-level cycles are identified. High-resolution sequences are divided based on the above results. The study shows that the stratigraphic base-level cyclic method is an efficient way in the determination of the high-resolution sequences, especially in the classification of the terrestrial and transitional depositional succession.     

同煤集团千万吨级矿井群建设开发模式研究

千万吨级矿井集群的开发建设是当前煤炭产业发展的趋势。对于老矿区建设发展千万吨级矿井集群,面临着由资源赋存、理念创新、技术突破以及管理变革等方面难点。立足自身条件,大同煤矿集团创新发展了双系煤田、整装煤田、整合矿井三种千万吨级矿井的建设模式,在深入研究三种模式的基础上,归纳其在设计理念、开采方式、技术应用以及管理方式等方面的创新之处,总结大同煤矿集团千万吨矿井建设开发模式,为其他同类型千万吨级矿井建设创新提供一定的理论指导意义。