(FR2670406-A1)      The vitrification procedure and appts. for waste prods. from household sources, hospitals or industry, including PCBs, consists of enclosing the waste in a container (10) which has m.pt. of Tc and is incinerated in a furnace (200) which is raised to a temp. Tf which is above Tc by a high-temp. jet generator (100, 110). The temp. of the jet is Tj, and it is directed at an angle D.    The container (10) is placed in the furnace (200) in line with the axis of the jet, and the difference in temps. Tf-Tc is adjusted so that in the first stage of incineration the jet pierces the container and raises the wate material to a temperature of Td, with the different temperatures satisfying the relationship Tj is greater than Td is greater than Tf is greater than Tc.    In the second stage of incineration the container and waste are completely vitrified into a vitreous magma at a temperature substantially the same as the mean temperature of the furnace Tf. The magma is then recovered from the furnace, and fumes resulting from the incineration are treated in a post-combustion unit (300).    ADVANTAGE -   Enables waste prods. to be coverted into chemically and bacteriologically inert substances.    (EP491615-B1)      Process for vitrification of waste enclosed in a container (10), characterised in that, the said container being made of a material of melting temperature Tc, the said process comprises the stages consisting, in a furnace (200) heated to a mean temperature Tf which is higher than Tc by a high-temperature generator (100) with a heat jet (110) directed along an axis D and in which the jet temperature is Tj, - in placing the container (10) in the furnace (200) on the axis D of the said heat jet (110), the temperature difference Tf-Tc being adjusted so that, in a first stage preceding the melting of the container, the said heat jet pierces the said container (10) locally and brings the waste thus confined to a temperature Tw which is higher than the mean temperature Tf of the furnace, the temperatures then obeying the inequalities: Tj is greater than Tw is greater than Tf is greater than Tc - in performing, in a second stage following the melting of the container (10), the complete vitrification, with air deficiency, of the container and of the waste into a vitreous magma (11), at a temperature substantially equal to the mean temperature Tf of the furnace (200), - in recovering the said vitreous magma (11) out of the furnace (200).