It is shown that expansible ettringite forms in the topochemical reaction,and crystallizes in-situ on the surface of unhydrated aluminate minerals and orients radially.
Modified calcium aluminate as a purifying agent, with two functions both of coagulability and desaltification, can be produced from industrial waste slag from alumina plant.
Strontium aluminate is more expensive, but it has a longer persistence, which means it emits visible light more slowly, and glows longer after being energized.
杂物与下水口侵蚀后的脱落物有关。
列 
料中的氧化铝溶出率＊的测
方法。
晶，呈放射状生长。
常见的有硫化锌和铝酸锶。
，
味着它发出可见光的速度较慢，充电后发光时间更
