Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1993-04-21
1995-12-05
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 36, 65 19, 106714, 106789, 106791, C03C 610, C03C 1306
Patent
active
054729173
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a raw material briquette for mineral wool production containing mineral raw material and binder therefore. The invention also concerns a process for the preparation of this briquette, as well as a process for the production of mineral wool, wherein the briquettes according to the invention are used as raw material.
Mineral wool is manufactured by melting mineral raw material in a melting furnace, either in a traditional cupola furnace, in a gas cupola furnace or in an electrical furnace. In the different furnace types, heat energy is introduced in the mineral raw material in different ways: in a traditional cupola furnace the mineral raw material is charged together with a fuel, usually coke, in a gas cupola furnace heat is introduced by burning gas or some other fluid fuel and in an electrical furnace electrodes are used which extend into the furnace.
One problem with cupola furnaces is that only relatively coarse material can be used as a more finely ground material has a tendency to form a compact mass in the furnace, which makes the necessary flow of air and flue gases through the charge difficult. In addition, finely ground material is more difficult to handle and it gives rise to inconvenient dust formation, wherefore the use of finely ground material is problematic also in electrical furnaces. Consequently it is not possible to use all the raw material sources which otherwise would be available, e.g. the waste, i.e. excess fibres and unfiberized material, so called pearls, which are produced during mineral wool manufacture, certain slag types, industrial waste from flotation processes, or e.g. the finest fractions from crushing of coarser material. This naturally means an economical loss, but also a limitation of available raw material compositions, e.g. when producing special fibres.
In connection with cupola furnaces one has tried to solve the problem by forming the finer raw material into raw material briquettes containing e.g. coal and coke (SE 8301233.6). Thus it is known to use, as a binder in raw material briquettes, hydraulic binders, especially portland cement and clay. The use of portland cement has the disadvantage that the briquette exhibits poor heat durability and loses its strength and turns brittle already at relatively low temperatures of 400.degree. to 500.degree. C., whereby the problem relating to the presence of particulate material in the furnace by no means is obviated. In the FI-patent application 840296 there is suggested the use of a briquette which, besides other mineral raw material, contains at least 20 percent of waste material from mineral wool production and at least 35 percent of a clay binder. A disadvantage with such a briquette are the high amounts of binder used, which provide for a large addition on the one hand of iron and on the other hand of aluminium in the mineral melt, which additions are not always of advantage in the finished mineral fibre, e.g. when a higher degree of solubility of the fibre is desired. Another disadvantage with clay bound briquettes is their poor moisture resistance, wherefore during storage they tend to take up water and disintegrate.
The aim of the present invention is to overcome the afore-mentioned drawbacks and provide a raw material briquette which exhibits good characteristics both during manufacture, i.e. good production economy, as well as good strength characteristics after manufacture, e.g. good storage resistance, especially against moisture, as well as good characteristics during mineral wool production itself, irrespective if this takes place in a cupola or an electrical furnace. The latter requirement means that the briquette does not disintegrate at low furnace temperatures, i.e. at temperatures below 1000.degree. C., and that its melting behaviour is well defined. This means that by regulating the components in the briquette it is actually possible to regulate to some degree the melting conditions in the furnace, e.g. the melting point for the raw material charge. The briquette also makes a bett
REFERENCES:
patent: 447360 (1891-03-01), Rockwell
patent: 544706 (1895-08-01), Whiting
patent: 1711676 (1916-02-01), Sutcliffe
patent: 2976162 (1961-03-01), Ekdahl
patent: 3294505 (1966-12-01), Garrison
patent: 4518432 (1985-05-01), Hess et al.
patent: 4545797 (1985-10-01), Elattar
patent: 4617045 (1986-10-01), Bronshtein
patent: 4662941 (1987-05-01), Hagerman
patent: 4720295 (1988-01-01), Bronshtein
patent: 4778523 (1988-10-01), Tomari et al.
patent: 4818289 (1989-04-01), Mantymaki
patent: 5100840 (1992-03-01), Urabe
Sarudis Mariana
Talling Bob Lars O.
Bell Mark L.
Paroc Oy AB
Sample David
LandOfFree
Raw material briquette for mineral wool production and process f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Raw material briquette for mineral wool production and process f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Raw material briquette for mineral wool production and process f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1374049