Covering agent for iron casting

Abstract

The invention discloses a covering agent for iron casting. The covering agent is prepared from, by weight, 5-8% of calcium bicarbonate powder, 14-29% of metallic magnesium powder, 1-2% of metallic rhenium powder, 5-16% of potassium nitrate, 1% of zirconium carbonate powder, 25-35% of buttonwood sawdust powder, 15-30% of plant ash, 9-17% of metallic iron powder and 5-8% of calcium carbide powder, and the covering agent is obtained by mixing and processing the components. The covering agent for the iron casting can generate heat itself, improvement of the heat preservation and heat insulation effects of the covering agent is facilitated, the condensing rate of metal liquid on a casting riser is slowed down, and the capacity of the covering agent for absorbing impurities in the metal liquid is enhanced.

Description

technical field [0001] The invention relates to a covering agent for cast iron, in particular to a covering agent used in the foundry field of the metal industry to keep molten metal warm. Background technique [0002] In the prior art, in the casting field, the molten metal in the ladle must be kept warm before and during the casting process. The heat preservation method has been using the traditional plant ash, but the plant ash is flammable and pollutes the environment; the slag-collecting heat-preservation covering agent disclosed in the patent publication number CN1032959A has the functions of heat preservation and slag collection, but because the perlite content is too high, it is easy to hang Ladle, often cause damage to the lining of the ladle. At present, acidic and neutral covering agents made of carbonized rice husk and perlite are usually used in China, which have poor heat preservation effect. The covering agent itself has no heating function and cannot compens...

AI Technical Summary

Problems solved by technology

The heat preservation method has been using the traditional plant ash, but the plant ash is flammable and pollutes the environment; the slag-collecting heat-preservation covering agent disclosed in the patent publication number CN1032959A, although it has the functions of heat preservation and slag collection, is easy to hang due to the high perlite content. ladle, often causing damage to the lining of the ladle

At present, acidic and neutral covering agents made of carbonized rice husk, perlite and other insulation materials are usually used in China, and the insulation effect is poor. The covering agent itself does not have a heating function and cannot compensate for the temperature drop during the casting process.