Covering agent

Abstract

The invention discloses a covering agent. The covering agent is characterized by consisting of 30-45% of magnesia, 5-14% of graphite powder, 25-34% of expanded perlite, and 22-40% of rice husk ash which are mixed and processed. The covering agent can be added with 5-8% of fluorite. The covering agent can form integrative insulation layer which prevents heat emission to keep warm, has a function of absorbing inclusions, and is applicable to slag heat preservation and covering in casting of ferrous materials such as grey cast iron, spheroidal cast iron, cast steel and the like.

Description

technical field [0001] The invention relates to a covering agent, in particular to a covering agent used for heat preservation of molten metal in a ladle before casting in the metal casting industry. Background technique [0002] In the prior art, the traditional plant ash has been used for heat preservation of the molten metal in the ladle before casting in the foundry industry. The plant ash is flammable, difficult to keep, and pollutes the environment. The slag-collecting thermal insulation covering agent, this covering agent has the functions of heat preservation and slag collection, but because the perlite content is too high, it is easy to hang the bag, which often causes damage to the lining of the ladle. The patent publication number is CN1118291A. Although the covering agent solves the bag-hanging problem, the multi-processing of mixed ingredients is more complicated. [0003] At present, acidic and neutral covering agents made of thermal insulation materials such ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the traditional plant ash has been used for heat preservation of the molten metal in the ladle before casting in the foundry industry. The plant ash is flammable, difficult to keep, and pollutes the environment. The slag-collecting thermal insulation covering agent, this covering agent has the functions of heat preservation and slag collection, but because the perlite content is too high, it is easy to hang the bag, which often causes damage to the lining of the ladle. The patent publication number is CN1118291A. Although the covering agent solves the problem of hanging bags, the processing of mixed ingredients is more complicated

[0003] At present, acidic and neutral covering agents made of carbonized rice husk, perlite and other insulation materials are usually used in China, which can only play the role of insulation, and have no function of absorbing inclusions.