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1987年6月5日至11日,国家环保局和中国环境科学学会,在南京举办了“全国首届资源综合利用技术交流交易会”(简称“双交会”)。“双交会”上展出了大量有关利用工业废渣生产新型建筑材料的项目。在粉煤灰和煤渣利用上,有株洲电厂的粉煤灰空心微珠分选技术;望亭发电厂等的粉煤灰漂珠保温隔热砖;宁夏建材研究所等的粉煤灰加气混凝土砌块;石家庄加气混凝土厂的无水泥粉煤灰加气混凝土工艺;山西粉煤灰资源开发公司的炉渣混凝土空心砌块、液态渣硅酸盐水泥及粉煤灰喷射水泥新技术等。
From June 5th to 11th, 1987, the National Environmental Protection Agency and the Chinese Society of Environmental Sciences held the “National First Resources Comprehensive Utilization Technology Exchange Fair” (referred to as “Double Crossing”) in Nanjing. The “Double Crossings” exhibited a large number of projects concerning the use of industrial wastes for the production of new building materials. In the use of fly ash and coal ash, there are sorting technologies for fly ash hollow microspheres in Zhuzhou Power Plant; fly ash floating bead thermal insulation bricks in Wangting Power Plant; and fly ash refueling in Ningxia Building Materials Research Institute Concrete block; cementless fly ash aerated concrete process of Shijiazhuang Aerated Concrete Plant; slag concrete hollow block of Shanxi Fly Ash Resource Development Company, new technology of liquid slag portland cement and fly ash spray cement.