METHOD AND DEVICE FOR DECREASING LEVEL OF CONTAMINATION OF TREATED ITEMS Russian patent published in 2009 - IPC C21D1/773 F27B5/04 F27D7/06 

FIELD: metallurgy.

SUBSTANCE: to decrease level of contamination of item at its heating in relatively contaminated atmosphere heating of item is performed in the first container which is filled with protecting gas at the first stage; further item is placed in the second container. Before heating the item there is created vacuum in the second container, while in the first container partial pressure of chemical compound contaminating the item is lowered. The first container is equipped with a device for supply of protecting gas, with a device for communicating the internal cavity of the first container with the internal cavity of the second container, also for creating depression in the first container at vacuumisation of the second container and for reducing partial pressure of the chemical compound contaminating the item. Material with considerable specific surface is placed in the first container; reacting with the chemical compound contaminating the item the material suppresses the compound and decreases level of contamination of the item.

EFFECT: decreased level of contamination of items during their heating in furnace.

39 cl, 6 dwg, 2 ex