Investigation on the pretreatment and cleaning technologies ofAustralian brown coal

在这个项目中，我们研究了澳大利亚褐煤煤矿的环境问题，以及褐煤脱水和脱水废水处理的有效技术。项目成员参观了拉特罗布河谷维多利亚的褐煤煤矿，并与褐煤研究人员进行了讨论。澳大利亚成员应邀参加了与煤炭利用有关的国际会议。这个项目是在会议结束后举行的Work Shop上介绍的，许多澳大利亚和日本的研究人员一起讨论了褐煤的利用。5名成员在澳大利亚褐煤研究机构停留了1-2个月，对褐煤矿山和最新的褐煤脱水技术进行了详细的调查。结果表明：1)露天褐煤在燃烧和废水处理过程中，微量元素的释放将是一个严重的问题。2)高灰分有机残渣是准备出口到日本和韩国的煤的副产品。该电厂目前正在利用有机废渣进行煤炭制备。3)MTE(机械热表达式)作为一种高效的脱水工艺受到了关注。4)一名澳大利亚博士生在京都停留了两周，利用首席研究员开发的Ni/C催化剂对MTE工艺的废水进行了水热气化。5)确定了实现MTE水热气化的操作条件。6)考察了碱金属、砷化合物和硒化合物的释放行为。7)用MM方法和MD方法模拟了与褐煤聚集体结构有关的氢键。

In this project, we researched the environmental problems in Australian brown coal mine and efficient techniques for the dewatering of brown coals and the treatment of wastewaters from dewatering processes. Project members visited brown coal mine in Victoria, Latrobe Valley and discussed with the brown coal researchers. Australian members were invited to the International Conference related to coal utilization. This project was introduced in the Work Shop held just after the conference and many Australian and Japanese researchers discussed together about the brown coal utilization. 5 members have stayed at Australian brown coal research institutes for 1 - 2 months to carry out detail surveys of brown coal mine and recent technologies related to brown coal dewatering. Following results were obtained1)Release of trace elements during combustion and treatment of wastewater in the open cut brown coal mine will be serious problems.2)Organic residue with high ash content is the byproduct of the preparation of coal for the export to Japan and Korea. The power plant is now working utilizing the organic residue for coal preparation.3)MTE (Mechanical Thermal Expression) is focused on as an efficient dewatering process. The relationship between the process conditions and wastewater properties was clarified.4)An Australian PhD student has stayed at Kyoto for two weeks and performed the hydrothermal gasification of wastewater for MTE process using Ni/C catalyst developed by the head investigators. The possibility for treating MTE wastewater was presented.5)It was found that the efficiency for whole process should be considered to determine the operating conditions for realizing the hydrothermal gasification process with MTE process.6)Release behavior of alkali metals, arsenic compounds, and selenium compounds was examined.7)Hydrogen bondings related to the aggregate structure of brown coal were simulated by using MM method and MD method.