METHOD FOR THE USE OF POWDERED MATERIAL

Abstract: There is disclosed a method for utilising powdery material, particularly combustible powdery waste material, e.g. paint powder or paint abrasive dust, where the powdery material in a way known per se is rolled or compressed to tablets, pills or briquettes as the rolling or compressing occurs in such a way that so high frictional heat is produced in order that the surface of the tablets, pills or briquettes "fuses". In a very simple way it hereby becomes considerably easier to dispose of and simultaneously to utilise environmental waste of the said type as the briquetted waste materail may be used a fuel which is easily fired into e.g. incinerators or combustion units of power stations, and which is now completely without dust explosion risk.

Description: Method for the use of powdered material The present invention concerns a method for utilising powdery material, particularly combustible powdery waste material, and of the kind indicated in the preamble of claim 1. Disposal of environmentally dangerous waste in the form of paint powder and/or paint abrasive dust from industrial painters and similar powdery waste material may in practice result in a very great economic load for the firm in question. Legal disposal of such environmental waste occurs by packing it into plastic bags and cardboard boxes of e.g. 20 kg and transporting the environmental waste to Kommunekemi (public incineration works for chemical waste in Denmark) which claims a destruction fee of the order DKK 4.50 per kg. The relatively great fee for destruction is the reason in practice that too often one sees illegal deposition on rubbish dumps or illegal incineration on the area of the firm or, even worse, in nature. By its nature, incineration is a very risky affair since the actual powdery waste products very often have so high calorific value and are so unstable that there is risk of completely uncontrollable, explosive fires, which, by the way, is the real reason for the actual environmental waste to be required sent to destruction at Kommunekemi by order from the environmental authorities. On that background, the purpose of the invention is to indicate a method for utilising powdery material, especially combustible powdery waste material, the method ena- bling disposal and simultaneous utilisation of environmental waste of the kind mentioned in a very simple way. The method according to the invention is characterised in that the powdery material in a way known per se is rolled or compressed to tablets, pills or briquettes. In a very simple way it hereby becomes considerably easier to dispose of and simultaneously to utilise environmental waste of the said type as the briquetted waste material may be used a fuel which is easily fired into e.g. incinerators or combustion units of power stations, and which is now completely without dust explosion risk. It is a very important aspect of the invention that by the indicated way it becomes possible to make a useful fuel from otherwise difficult environmental waste, i.e. instead of paying a relatively great destruction fee, it now becomes possible to sell the briquetted waste material, preferably for use as fuel in power station boilers etc. Suitably, the method according to the invention is performed in such a way that by the compressing so high frictional heat is produced for the surface of the tablets, pills or briquettes to "fuse", i.e. the briquettes become dustless to the greatest possible extent. Advantageously, the method according to the invention may be utilised in such a way that compressing occurs by means of screw compressor wherefrom the compressed material is discharged as a sintered, cylindric sausage of material which is continuously broken off into lesser briquette-like pieces. Besides, it may be advantageous that the method according to the invention is performed so that a suitable binder is added to the powdery waste material prior to the rolling or compressing. Preferably, the method according to the invention is performed so that the tablets, pills or briquettes are used as fuel, e.g. in power station boilers and/or cogeneration plants. The making of the tablets, pills or briquettes by rolling or compressing will not be explained in more detail as materials known per se are preferably used for rolling or compressing of the powdery waste material to tablets, pills or preferably briquettes.

Claims: CLAIMS 1. A method for utilising powdery material, particularly combustible powdery waste material, e.g. paint powder or paint abrasive dust, characterised in that the powdery material in a way known per se is rolled or compressed to tablets, pills or briquettes. 2. A method according to claim 1, characterised in that the rolling or compressing occurs in a such way that so high frictional heat is produced in order that the surface of the tablets, pills or briquettes "fuses". 3. A method according to claim 1, characterised in that the compressing occurs by means of a screw compressor from which the compressed material is discharged as a sintered, cylindric sausage of material which is continuously broken off into lesser briquette-like pieces. 4. A method according to claim 1, characterised in that a suitable binder is added to the powdery waste material prior to the rolling or compressing. 5. A method according to any preceding claim, characterised in that the tablets, pills or briquettes are used as fuel, e.g. in power station boilers or cogeneration plants.

Inventors: JENSEN GERT HJORT, THAGAARD NIELS, JENSEN, GERT, HJORT, THAGAARD, NIELS
Applicants: JENSEN GERT HJORT, THAGAARD NIELS, JENSEN, GERT, HJORT, THAGAARD, NIELS
Application year: 2000
Main classification: C10L5
IPC codes: B05B15, C10L5