Metallurgy

Application in metallurgy

Properties of vermiculite, such as high melting point (1350 ºС), low thermal conductivity, the neutrality of the interaction with the molten metal, identified the possibility of its use for casting iron and steel.

 

Vermiculite in paper bags down on the bottom of the molds before casting the melt. When filling molds with metal, paper burns, vermiculite rises to the surface and covers the profitable part.

 

This allows you to dramatically reduce heat loss and increase the residence time of metal in liquid state.


Piping in bars, warmed in a manner fully displayed in the profit and underneath is a dense, healthy metal.

Determination of the chemical composition of the metal cross section of the ingot shows the lack of phase separation zones, due to specific crystallization in vermiculite shirt.

 

Also swollen vermiculite in the industry for lining steel ladles, and electrolytic furnaces used vermiculite plates.

 

Vermiculite is used as a swollen insulation filling at insulated surfaces from -260 to 1100 ºС.


Thermal insulation products on the basis of expanded vermiculite should be used in isolation units with a working temperature of 900 - 1200 ºС.


Heat insulating vermiculite board is widely applied in isolation :

• Removable panels cover the annular furnace

• External insulation of glass furnaces

• Lining of roller kilns

• Insulation of electrolyses

• Insulation of brick kilns


Details about the properties of vermiculite insulation materials described in the case Insulation section