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Amenability to dry processing of high ash thermal coal using a pneumatic table

International Journal of Mining Science and Technology 2015年第6期25卷 955-961页

作者： Dey Shobhana Gangadhar B. Gopalkrishna S.J. mineral processing Division CSIR-National Metallurgical Laboratory Jamshedpur 831007 India departrnent of mineral processing Vsku Pg Centre gellary 5831 lg India

High ash thermal coal from India was used to conduct the dry processing of fine coal using a pneumatic table to evolve a techno-economically novel technique. The fine as-received sample having 55.2g ash was subjected to washability studies at variant densities from 1.4 to 2.2 to assess the amenability to separa- tion. The experiments were conducted using a central composite design for assessing the interactive effects of the variable parameters of a pneumatic table on the product yield and ash content. The performance of the pneumatic table was analyzed in terms of clean coal yield, recovery of combustibles, separation efficiency （Esp） and useful heat value of clean coal. The combustibles of clean coal obtained through a single stage operation at 35% and 38.7% ash were 40% and 63% respectively. However, the two stage processing was more effective in reducing the ash content in the clean coal. The rougher concentrate generated at higher ash level was subsequently processed in different conditions at 35% ash level, and 58g combustibles could be recovered. Hence, two stage processing increases the combustibles by 18 units and the useful heat value of clean coal increases from 1190 kcal/kg to 3750 kcal/kg.

关键词： Dry processingAir flow rateMinimum fluidizing velocityOrganic efficiency

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New Technologies on Mine Process Tailing Disposal

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Journal of Geological Resource and Engineering 2016年第2期4卷 63-72页

作者： Bascetin A Tuylu S Adlguzel D Ozdemir O Mining Engineering departrnent Engineering Faculty Istanbul University Istanbu134413 Turkey

Tailings are formed as a result of mine processing. When these tailings are left in an environment in an inappropriate manner, they create a danger against the environment and human health. Therefore, the safe disposal of mine tailings above the ground is environmentally quite important. Today, tailing dams are generally used in the disposal of these mine tailings. However, this method has many environmental disadvantages such as AMD （acid mine drainage）, heavy metal mobilization etc. For this reason, the use of alternative methods such as surface paste tailing disposal or geotextile methods are gradually increasing in the world. In this study, the advantages and disadvantages of the surface paste tailing disposal method and tailing disposal method using geotextile material compared to the traditional tailing dam method were evaluated in detail, and, the costs of these three methods for a typical Pb-Zn mine establishment were compared. The analysis indicated that the unit costs of the tailing dam, the surface disposal method, and the geotextile method were calculated as 2.25 S/ton, 2.29 S/ton, and 7.39 S/ton, respectively. However, the unit price of surface paste disposal method become 2.79 S/ton when cement was used. The higher cost of the unit price of the tailing disposal method using geotextile method was attributed to the high cost of geotextile material.

关键词： Mine tailing tailing dam surface paste disposal geotextile material.

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Effect of intracranial hypertension on cerebral hemorrhage induced autonomic nerve imbalance

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Neural Regeneration Research 2007年第3期2卷 175-178页

作者： Xuelong Jin Wenli Jing Fengxia Yan Zhaoqiang Zhang Fengjun Lǚ Shuiqing Jing Na Sun Kazushige Mizoguchi Department of Physiology School of Basic Medical Sciences Tianjin Medical University Tianjin 300070 China departrnent of Physiology Chengde Medical College Chengde 067000 Hebei Province China Department of Geriatric Medicine National Center for Geriatrics and Gerontology Japan

BACKGROUND： Cerebral hemorrhage can cause the imbalance of nerve function, whereas its mechanism and main impact factors are still not quite clear. OBJECTIVE： To explore the rules about the changes of intracranial pressure in brainstem hemorrhage and internal capsule hemorrhage, and analyze the role of intracranial hypertension in the changes of nerve function caused by cerebral hemorrhage. DESIGN： A self-controlled trial. SETTING： Department of Physiology, Tianjin Medical University. MATERIALS： Sixty-five healthy male Japanese white rabbits with long ears （1.5-1.8 kg） were supplied and fed by the Department of Animal Experiment of Tianjin Medical University. The RM6240B biological signal collecting and processing system was used. METHODS： The experiments were conducted in the Department of Physiology, Tianjin Medical University from August 2001 to May 2006. ① The rabbits were anesthetized, then fixed onto the brain stereotaxic apparatus, and afterwards fenestration on skull and intubation to lateral ventricle were *** dynamic changes of intracranial pressure were monitored continuously. Rabbits were infused with autologous arterial blood （0.3 mL） into midbrain corpora quadrigemina inferior colliculus to induce model of acute brainstem hemorrhage; models of internal capsule hemorrhage were established by infusing autologous arterial blood into internal capsule. ② The dynamic intracranial pressures under the above conditions were recorded continuously with the RM6240B biological signal collecting and processing system. ③ An animal model of persistent intracranial hypertension was established by infusion of physiologic saline into lateral ventricle. ④ The changes of the intensity of autonomic nerve discharge were analyzed, using the biological signal collecting and processing system before and after hemorrhage and under persistent intracranial hypertension.⑤ Ten animal models of internal capsule hemorrhage and 10 of bminstem hemorrhage were selected respecti

关键词： autonomic nervous system cerebral hemorrhage intracranial pressure

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