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化工部第二化建公司在安装镇海石油化工总厂从日本引进的30万t化肥装置中,在硫磺回收工段硫磺槽等设备上采用日本AR耐酸水泥作为内衬防腐隔热材料。这种水泥是以硅酸盐为粉料,以石英为主、长石为辅的粗细集料,粒度为40～80目和80～120目两种,并混有温石棉纤维、氟硅酸钠等。使用时按100份耐酸水泥加13～16份水(重量比)配比拌和均匀。这种耐酸水泥加水搅拌1～5min即可使用。初凝时间:20℃以上时约40min;10～20℃时,约60min。拌和料应在初凝前用完。 1.AR水泥在5℃以下时才需采取冬季取暖施工措施。 2.用于设备内衬厚度50mm时,要求一次施工即可达到所规定的厚度,不需要分层粉刷也不会产生起壳、流淌等现象。 3.AR水泥施工完毕不需酸处理。
In the 300,000 t fertilizer plant imported from Japan by the Zhenhai Petrochemical General Plant, the Second Chemical Construction Department of the Ministry of Chemical Industry used Japanese AR acid-resistant cement as the lining anti-corrosion and heat insulation material in the sulphur tanks and other equipment in the sulfur recovery section. This cement is a silicate powder, mainly quartz, supplemented by feldspar coarse aggregate, particle size of 40 to 80 mesh and 80 to 120 mesh two, and mixed with chrysotile fiber, fluosilicic acid Sodium and so on. When used, mix 100 parts of acid-resistant cement with 13-16 parts of water (by weight). This acid-resistant cement can be used by stirring with water for 1 to 5 minutes. Initial setting time: about 40 minutes at 20°C; about 60 minutes at 10 to 20°C. Mixing materials should be used up before initial setting. 1. It is necessary to adopt winter heating construction measures when AR cement is below 5°C. 2. When used for equipment with a lining thickness of 50mm, a single construction is required to reach the specified thickness. No stratified painting is required and no crusts, turbulence, etc. are generated. 3. The AR cement is finished without acid treatment.