石炭灰・スラグの現状と展望(<特集>石炭灰とスラグ)

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Since the oil crisis, the diversification of energy has been of prime importance in the Electric Utility Industry. Coal is still one of important Japan's primary energy sources; it has gradually increased since the oil crisis of 1973 and accounts for about 20% now. The annual amount of coal ash generated from the coal-fired station in 2008 is about 10 million tons. Because of decreased production of a recent cement industry in Japan, it's imperative that we look for a new other effective use strategy except the raw material of cement as the main effective usage of coal ash. Moreover, from the viewpoint of global warming in recent years, IGCC system is expected to put into practical use instead of pulverized coal thermal power generation system. In this case, slag comes out as fused coal ash from IGCC system, and the research on its effective use is just in an early phase now. Modern steel production started in 1901 in Japan. Blast furnace slag had been used mostly as a construction material within the ironworks because of the rapid growth of the industry with Japan. Due to decrease of slag use within the ironworks in 1970's, the broad utilization of slag outside the ironworks public use become necessary. Nippon Slag Association was established in 1978 under the cooperation of steel makers and slag dealers for promoting the utilization of slag to public use. The Association acted an important role for setting up standards and guidelines of slag materials for utilization in cooperation with universities, governmental organizations and companies. The slag is now in use as a material in its own right in various sectors. Stable quality and properties the slag that are difficult to obtain from natural materials attract increasing attention in this century as an environmentally friendly material from the perspectives of resource saving, energy conservation and CO_2 reduction. The current state and future prospect of coal ash and slag are reviewed in this chapter.
2011-05-20

石炭灰・スラグの現状と展望(<特集>石炭灰とスラグ)

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