Vol.11 no.3 2019

Research paper : High-value materials from incineration residues of burnable garbage (N. FUKAYA et al.)−125−Synthesiology - English edition Vol.11 No.3 (2018) between the “seeds” and “needs” of the specialists from totally different elds, and the fact that they were able to start joint research to tackle new topics.Moreover, in this research, announcement was made in the form of a joint press release for the results of joint research by Mitsui E&S and AIST. As a result, during the rst half of the research period, joint research was started to tackle new topics, and in the latter half, we received several inquiries from companies that “wanted to use the silica made from molten slag,” and this led to user acquisition for sample distribution work. In the next chapter, details of the activities will be described along the scenario.2 Background of development2.1 Current situation of municipal garbage disposalEver since the Great East Japan Earthquake, importance is increasing for the usage and popularization of autonomous distributed energy.[1] Municipal garbage disposal plants are capable of utilizing thermal energy generated when disposing garbage, and are drawing attention as distributed energy recovery facilities that are constructed in every local government unit throughout Japan. On the other hand, incineration ashes are produced after burning garbage at these disposal plants, and most of them are buried in landll sites. However, in some disposal plants, to reduce the volume of ashes, they are melted at high temperature, cooled in water, and recovered as vitried solids called “molten slag.” According to the statistics for FY 2015, there are 1,141 municipal garbage disposal plants in Japan. There are several disposal methods, and there are 220 plants with melting facilities to produce molten slag.[2] Although this is 20 % of the total number of municipal garbage disposal plants, power generation capacity is 3,645 GWh, and this is 45 % of the total 8,175 GWh generated by municipal garbage disposal plants. This is important value of power generation plants.2.2 Characteristic of molten slagThe main components of molten slag derived from garbage are SiO2, CaO, and Al2O3. Although the composition ratio may fluctuate depending on region or season, the total of these three components is about 70 wt% of the composition, and SiO2 is about 40–50 %. The production volume of molten slag at municipal garbage disposal plants that treat general waste in Japan reaches about 800,000 ton/year (FY 2015) (Fig. 2). In 2006, two JIS standards (JIS A5031 and JIS A5032; one for concrete aggregate and the other for roads) were established to define the safety of molten slag and to promote its effective use. The items for quality control include physical properties (density, water absorption, abrasion loss, etc.), chemical properties (composition, etc.), and safety tests (elution amount and content of hazardous materials). The current use of molten slag is mostly for construction material. Most uses are for infrastructure construction including about 34 % as road aggregate and about 17 % as concrete aggregate (Fig. 3).[2]Fig. 1 Scenario of this research and future prospectsProspectsCurrent situationJoint research○ Resource savings by substance circulation, advanced use of distributed energy, energy savings of manufacturing proces○ Using waste residue as resource, return to society as high value-added, functional materialsContacts from companies of various industrial elds after press releaseand othersVarious adsorbentPaint, sealantAdditives to synthetic rubber and tireVarious industrial uses of silicaDissemination of research results 2Social issuesUse of distributed energyEnergy savings in manufacturing silicon chemical productsDiscovery of new technologyDissemination of research results 1Demand from industryCreation of technological potentialTechnology for manufacturing functional chemical products using silica contained in sand or incineration ash as raw material (Organic silicon functional chemical product manufacturing process 2012‒2013 METI, from 2014 NEDO)Poster presentation at AIST Techno Bridge about the technology for direct manufacturing of silicon chemical products from silicaEective use of “molten slag” produced at municipal garbage disposal plantsEciency of garbage disposal by local governmentsSynthesis of silica with high specic surface area and mesoporous silica using molten slag as raw materialJoint press release of AIST and Mitsui Shipbuilding & Engineering (at the time) “Functional materials manufactured from incineration residues of burnable garbage”

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