Process for disposal of waste by combustion with oxygen

The process for the disposal of raw waste material comprising:

• (a) combusting in a combustion chamber, without after burning, raw waste material with a combustion supporting gas which has not been pre-heated to produce waste gases, flue dust and non-combustible, non-volatile liquid slag, said gas containing at least 50% oxygen and said combustion occurring at an associated temperature of combustion;
• (b) introducing a additive selected from the group consisting of non-ferrous metals, non-ferrous metal compounds, and non-ferrous oxides into the waste gases;
• (c) cooling the waste gases produced during step (a) by recovering energy therefrom;
• (d) reducing the temperature of combustion to the range of 1,200.degree. C. to 1,800.degree. C. by at least one of (i) lowering the calorific value of the waste material, (ii) recycling at least a part of the cooled waste gases from step (b) and (iii) cooling the combustion chamber;
• (e) removing the flue dust from the waste gases;
• and
• (f) discharging the non-combustible non-volatile liquid slag.

A process for the disposal of raw waste material comprising the steps of:

• (a) providing waste feed stock in the form of a solid, a paste or a liquid, said waste feed stock comprising said raw waste material;
• (b) reacting the waste feed stock in the presence of a combustion supporting gas which has not been preheated, said gas containing at least 50% oxygen, to produce waste gases, flue dust and non-combustible, non-volatile liquid slag;
• (c) controlling the composition of said waste feed stock so that said flue dust and said non-volatile liquid slag comprise one or more residual components selected from the group consisting of non-ferrous metals, non-ferrous metallic compounds, and non-ferrous metal oxides;
• (d) reducing the temperature of the products within the combustion chamber to the range of 1,200.degree. C.-1,800.degree. C.;
• (e) cooling the waste gases in a waste heat boiler and recovering energy from said waste heat boiler;
• (f) removing the dust from said waste gases;
• and
• (g) discharging the non-combustible, non-volatile liquid-slag.