Rockwool International A/s

Leif Moeller Jensen

Lars Boellund

Lars Elmekilde Hansen

Lars Kresten Hansen

Peter Farkas Hansen

Gurli Mogensen

Peter Farkas Binderup Hansen

Peter Farkas Bindercup Hansen

Ole Andreasen

Hans Hoyer

Trine Frickmann

The invention relates to a method of making a mineral melt comprising providing a circulating combustion chamber () which comprises an upper zone (), a lower zone () and a base zone (), injecting particulate fuel, particulate mineral material and primary combustion gas which has optionally an oxygen level of at least 25% by volume into the upper zone of the circulating combustion chamber so that the fuel undergoes pyrolysis in the upper zone to produce char, thereby melting the particulate mineral materials to form a mineral melt and generating exhaust gases, injecting secondary combustion gas which has optionally an Oxygen level of at least 25% by volume into the lower zone of the circulating combustion chamber so that the char combusts, thereby completing combustion of the fuel, and separating the mineral melt from the hot exhaust gases so that the hot exhaust gases pass though an outlet in the circulating combustion chamber and the mineral melt collects in the base zone. The melt is optionally fiberized. The invention also relates to apparatus suitable for use in the method.

Process and apparatus for making a mineral melt

The present invention relates to a method of making mineral fibers, comprising providing a circulating combustion chamber () which comprises a top section (), a bottom section () and a base section (), injecting primary fuel, particulate mineral material and primary combustion gas into the top section of the circulating combustion chamber and combusting the primary fuel thereby melting the particulate material to form a mineral melt and generating exhaust gases, separating the mineral melt from the exhaust gases wherein the exhaust gases pass through an outlet () in the circulating combustion chamber and the mineral melt collects in the base section of the circulating combustion chamber, injecting secondary fuel, which comprises liquid or gaseous fuel, and secondary combustion gas into the bottom section of the circulating combustion chamber to form a flame in the bottom section which heats the melt, and flowing a stream of the collected melt through an outlet () in the base section to a centrifugal fiberising apparatus and forming fibers. The present invention also provides an apparatus for use in the method of the invention.

Process of and apparatus for making mineral fibers

Particulate mineral material suitable for forming a fiberisable melt is melted in a flame formed by combustion of powdered carbonaceous fuel with preheated air and the particulate mineral material is then preheated, and the exhaust gases are subjected to NOx reduction, in a cyclone preheater ().

Process and apparatus for making mineral fibres

In a method for the preparation of a melt for the production of mineral wool a raw material is introduced at the top of a shaft furnace and heated to melting temperature partly with a hot gas formed by plasma heating and partly with a hot gas formed by combustion of one or more gaseous hydrocarbons, the latter gas stream being introduced at a level at which the temperature does not exceed 1250.degree. C., and the melt formed is discharged at the bottom of the shaft furnace.

Method and furnace for the preparation of a melt for mineral wool

Method of preparing a melt for the production of mineral wool

Method of producing a melt from rock materials in a cupola furnace which materials are charged as uniformly-shaped briquettes together with coke. In order to recue the content of CO in the exhaust and to increase the melting capacity of the furnace, the flow of combustion air related to the cross-section of the furnace is at least 60 Nm.sup.3 /m.sup.2 minute, and the briquettes having such a shape that a porosity in the combustion zone is more than 0.45.

Method of producing molten stone material in a cupola furnace

Alkali resistant, synthetic, mineral fibres having the following composition on weight basis: SiO.sub.2 : 42-50%, Al.sub.2 O.sub.3 : 8-13%, Iron oxides (calculated as FeO): 6-11%, CaO: 4-11%, MgO: 17-22%, TiO.sub.2 : 0.5-3% and alkali metal oxides: 0.5-3.5%.

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Frederiksberg, Denmark

Leif Moeller Jensen