摘要:
Cast iron pipe (12,15) and other elongated hollow articles are lined with a cementitious mortar for certain applications, such as the transmission of potable water or sewage. To improve the resistance to attack from acids and to provide a crack and holiday free cement lining, a calcium alumina cement (22) is used to line the article. A plasticizer such as fireclay is added to the calcium alumina cement prior to its application. The cement lined article is then coated with an asphaltic based coating (26,28) and then cured in a high humidity environment. An epoxy coating (16,18) may be applied to the bell end (10) and spigot end (14) of the pipe before the application of the cement.
摘要:
A method and apparatus for feeding alloy additive and burden materials to the burden in a vertical shaft furnace working volume generally by gravity feeding the alloy additive to the furnace tuyere (22) for entrainment in the blast media and transfer to the burden, which improves the recovery rate of the charged additive components in the molten metal and allows utilization of undersized materials without secondary handling and treatment of the feed materials or utilization of pneumatic feed apparatus.