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铸石是一种硅酸铝铁复盐,它具有突出的耐磨性能和优良的耐化学腐蚀性能。它是以天然的辉绿岩为主料,能在100～150℃左右长期使用。铸石粉广泛用作各种胶泥填料,用在设备防腐衬里,使用温度可达300℃左右。但此种胶泥孔隙大,易渗透,故应设置防渗层,采用复合固化剂(氟硅酸钠加一氧化铝),可减少胶泥孔隙率,增高强度,提高耐稀酸性能。上海染化五厂已多年用在各种容器衬里,使用后只发现有部份漏洞及涨鼓现象,经修复后仍可继续使用。铸石也有一些缺点,如板材性脆,不耐冲击。
Cast stone is an aluminum silicate double salt, it has outstanding wear resistance and excellent chemical resistance. It is based on natural diabase, which can be used for about 100 ~ 150 ℃ for a long time. Casting stone powder is widely used as a variety of clay filler, used in equipment, anti-corrosion lining, the use of temperature up to 300 ℃. However, such a large pore porosity, easy to penetrate, it should be set anti-seepage layer, the use of composite curing agent (sodium fluosilicate plus aluminum oxide), can reduce the porosity of clay, increased strength, improve resistance to dilute acid. Shanghai Dyeing and Finishing Plant has been used in various container linings for many years. After using it, it only found some loopholes and upheavals. After being repaired, it can still be used continuously. Cast stone also has some disadvantages, such as plate brittle, impatience impact.