EP1192112A1 - Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production - Google Patents

Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production

Info

Publication number
EP1192112A1
EP1192112A1 EP00947836A EP00947836A EP1192112A1 EP 1192112 A1 EP1192112 A1 EP 1192112A1 EP 00947836 A EP00947836 A EP 00947836A EP 00947836 A EP00947836 A EP 00947836A EP 1192112 A1 EP1192112 A1 EP 1192112A1
Authority
EP
European Patent Office
Prior art keywords
process according
briquettes
particulate material
particulate
furnace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00947836A
Other languages
German (de)
English (en)
Inventor
Jean Marie Wilhelmus Cuypers
Raymond Smit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockwool AS
Original Assignee
Rockwool International AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rockwool International AS filed Critical Rockwool International AS
Priority to EP00947836A priority Critical patent/EP1192112A1/fr
Publication of EP1192112A1 publication Critical patent/EP1192112A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/002—Use of waste materials, e.g. slags
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/02—Pretreated ingredients
    • C03C1/026—Pelletisation or prereacting of powdered raw materials
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions

Definitions

  • This invention relates to processes of making high alumina content man-made vitreous fibres (MMVF) from a mineral charge which includes briquettes, and to briquettes for this purpose, as well as processes for producing the briquettes .
  • MMVF man-made vitreous fibres
  • MMVF may be made by forming a mineral melt by melting a mineral charge in a furnace and fiberising the melt, usually by a centrifugal fiberising process.
  • a furnace which are used, there is a large pool of melt and the mineral charge is melted into this pool. Examples are tank and electric furnaces. In such furnaces, the physical form (i.e., lump or powder) of the mineral charge is less important since the melting is conducted into a large volume of previously melted material .
  • furnace which is used for forming the melt for MMVF production, especially of fibres of the types that are referred to as rock (including stone or slag) fibres.
  • This is a shaft furnace in which the furnace contains a self-supporting column of solid coarse mineral material and combustion gases permeate through this column so as to heat it and cause melting.
  • the melt drains to the bottom of the column, where a pool of melt is usually formed, and the melt is removed from the base of the furnace. Since the column has to be both self- supporting and permeable it is necessary that the mineral material should be relatively coarse and should have considerable strength, despite the high temperatures in the column (which may exceed 1000°C) .
  • the mineral material can be formed of coarsely crushed rock and slag provided this will withstand the pressures and temperatures in the self-supporting column in the shaft furnace. It is known to convert the finer particulate materials such as sands into bonded briquettes for addition to the furnace. These should have sufficient strength and temperature resistance to withstand the conditions in the self-supporting column in the shaft furnace in order that they melt prior to collapsing.
  • WO97/30002 specifically describes the use of bauxite.
  • bauxite (calcined and/or uncalcined) is the material which has been most widely proposed and used for the manufacture of such fibres.
  • bauxite is a relatively expensive raw material and the use of bauxite incurs difficulties (additional to its cost) in a shaft furnace containing a self-supporting stack of mineral material.
  • bauxite In a shaft furnace bauxite must be charged in a form which can form part of the self-supporting stack. Thus it can be charged as coarse rock. In shaft furnaces the residence time of material in the small melt pool at the base of the furnace is short, and the raw materials must be incorporated sufficiently rapidly in this pool of melt if a melt is to be obtained which is suitable for provision of final product having good properties.
  • Bauxite requires a high temperature for melting, in particular if provided in the form of coarse rock, due to its slow rate of melting.
  • Bauxite can also be provided as part of the briquette component, which requires major energy expenditure to crush and grind the bauxite into a suitable form.
  • bauxite gives melting problems due to its high melting point.
  • a proportion of the bauxite does not melt at all but is instead dissolved in the melting zone and in the pool of melt at the base of the furnace.
  • fuel in particular solid fossil fuel such as coke. This increases costs and improves melting.
  • the bauxite if even a small proportion of the bauxite is not melted or dissolved completely, it accumulates in the bottom of the furnace. The accumulated bauxite reduces the volume of the melt pool and the residence time in that pool is thus reduced further. Consequently the accumulated unmelted bauxite must be removed from the furnace from time to time.
  • Briquettes are particularly useful for forming part, often most, of the charge in a shaft furnace. They may also be used as part of the charge in an electric furnace . Briquettes are a useful vehicle for adding to the furnace components of the charge which have small size. These include waste from MMVF production processes (MMVF waste) . MMVF waste is a useful and economical component for inclusion in briquettes but tends to have a rather high moisture content. This may for instance be around 10 to 15%, but may be up to 80%. This moisture content can arise due to contact of the fibres with water as they are being removed from the base of the spinning chamber or other stage of the production process from which they come. This moisture content, if high, can cause difficulties in formation of briquettes.
  • O98/30512 describes a binder system for the production of briquettes. It acknowledges that calcined bauxite is known for use as a binder in the production of briquettes. This publication described an alternative binder produced by sintering a mixture of crude bauxite and marl and then grinding the sintered product . The binder is apparently intended as a replacement for Portland cement and appears to have a particle size distribution in which substantially all particles have size below 50 ⁇ m. Although production of mineral fibre products is mentioned generally, there is no indication of specific fibre types for which the briquettes containing the defined binder should be used.
  • Al 2 0 3 based on oxides by providing in a furnace a mineral charge which includes briquettes, melting the charge to provide a melt, removing melt from the furnace and fiberising the melt, characterised in that the briquettes comprise particulate alumina-containing material which has a size at least 90% by weight below 700 microns, alumina content at least 50% by weight of the material and porosity measured by mercury porosimetry (as discussed below) such that the percentage of pores of size below 1 ⁇ m is at least 20%, preferably at least 25%.
  • the combination of small size and high porosity defined means firstly that the particulate material has improved melting and dissolution properties in the furnace, especially in a shaft furnace such as a cupola furnace, in comparison with crushed bauxite. This is achieved despite the high content of alumina, which is very similar to that of bauxite. We also find that the combination of high surface area and small size influences the interaction of the particulate material with moisture- containing materials in briquettes.
  • the particulate alumina-containing material has a defined small size of at least 90% by weight below 700 microns.
  • at least 90 wt. % are below 600 microns, more preferably below 500 microns.
  • at least 90 wt. % are below 300 microns, more preferably below 250 microns.
  • at least 50 wt. % of the particles have a size at least 30 microns, and preferably at least 60 wt. % have a size at least 40 microns.
  • the average particle size is from 30 to 100 microns, preferably 40 to 80 microns.
  • Particle size can be measured by known laser scattering techniques (eg using the Malvern technique) .
  • Porosity of the particulate material is determined using mercury porosimetry. Porosity is measured for pores from diameter 0.0100 to 1000.000 ⁇ m. Porosity can be measured using an Autopore II 9220 apparatus, available from the company Micromeritics . An appropriate penetrometer should be chosen according to the usage instructions and we find that part numbers 920-61714-00 and 920-61716-00 are often appropriate.
  • the percentage of porosity provided by pores of size less than 1 ⁇ m is established as follows.
  • the cumulative intrusion is plotted (for the pore size range discussed above) against pore diameter.
  • the total cumulative intrusion at pore diameter 0.01 ⁇ m can be designated as x.
  • the cumulative intrusion at diameter 1 ⁇ m can be designated as y.
  • This mercury porosimetry measurement method also gives a value of total pore area and this value is preferably at least 4 m 2 /g, more preferably at least 6, in particular at least 8 or 10 m 2 /g and in particular at least 12 m 2 /g.
  • This mercury porosimetry method also gives a value of porosity and this value is preferably at least 40%, more preferably at least 45 or 55%.
  • the material also has multi-point surface area measured by BET analysis of at least 2 m 2 /g, preferably at least 10 m 2 /g.
  • the surface area of the particulate material is the multi-point surface area value given by BET analysis.
  • This value is preferably at least 2 m 2 /g, more preferably at least 10 m 2 /g, most preferably at least 20 m 2 /g. It may in particular be at least 30 m 2 /g and particularly preferably at least 50 m 2 /g.
  • BET analysis also gives a value of single point surface area and preferably this property also has the preferred values given above.
  • BET analysis is a well known technique and may be carried out using any suitable apparatus, in particular the
  • the porosity and surface area are also influential in controlling the behaviour of the particulate material in contact with moisture during briquette formation.
  • the particulate material is substantially inert to moisture.
  • substantially inert we mean that the material undergoes substantially no chemical reaction with moisture under the conditions to which it is subjected during the briquetting process. Temperature of briquetting may range from room temperature
  • cement briquettes are produced at around room temperature and molasses briquettes (form stones) may be formed at temperatures up to 60°C.
  • Briquetting pressure may be around 20 kN/line centimetre in the case of molasses briquettes and the material should be inert under these conditions.
  • Cement briquettes are often made by vibrating the particulate material in a mould without substantial pressure and the particulate material should not react chemically with moisture under these conditions. In general, the material is inert under conventional briquetting conditions.
  • particulate materials which are inert to moisture under the briquetting conditions give advantages over those which are not inert and which undergo substantial reaction with moisture.
  • materials according to the invention absorb or adsorb water easily, thus alleviating briquetting problems with moisture- containing materials, but since they do not chemically react with the water they release it easily when charged to the furnace.
  • the water absorbed or adsorbed into or onto the particulate material may be driven off at a temperature of around 100°C, whereas if the material reacts with water a temperature of from 200 to 400°C would be necessary. With this preferred feature of the invention it is possible to ensure that most or all of the absorbed water is driven off at the top of a shaft furnace, where the temperature is relatively low.
  • the inert raw material can have advantages when the overall moisture content of the raw materials used to form the briquettes is rather low.
  • a low level of moisture eg at least 0.5% or at least 1% by weight of the mixture used for moulding the briquettes, up to 5% or 3%) is advantageous for reaction with binder.
  • the material of the invention can adsorb or absorb moisture but give it up during the briquetting process (if necessary for reaction with the binder) since it has not chemically reacted with the moisture.
  • Suitable preferred particulate alumina-containing materials can be defined in terms of their hygroscopicity . In particular, they can be defined by means of the percentage increase in weight (based on weight before testing) of the particulate material when it is exposed to relative humidity of 90% at 20°C for 24 hours. Preferably the weight increase is at least 2 wt . %, more preferably at least 4 wt . %, in particular around 5 wt . % or greater.
  • preferred materials have this hygroscopicity without being provided with extremely fine particle size.
  • the material preferably has both the preferred minimum particle sizes discussed above and the preferred hygroscopicity properties.
  • Suitable materials which can be used as the particulate alumina-containing material include activated bauxite. This can be made in known manner, eg by roasting gibbsite at around 400 to 800°C.
  • Particularly preferred materials are filter dusts from the calcination of bauxite and other processes involving heating and/or calcination of high alumina materials, in particular in the production of refractory materials.
  • Various filter dusts are known from a wide variety of processes, and various wastes are known from the production of high alumina refractories, but the majority do not have the combination of chemical analysis and physical properties discussed above. However, filter dusts can be found with these properties.
  • the filter dust as received may have the defined particle size range but if not it can be subjected to treatment such as sieving in order to provide this particle size range. It is particularly beneficial in the invention to be able to use materials of this type because they are generally waste products and are normally sent to landfill after collection. Thus use of these materials provides both an economical means for obtaining the properties essential in the invention and a use for a material which would otherwise be dumped.
  • the filter dust can be obtained as a by-product of the process of calcination of bauxite. This is carried out for instance during the production of materials for refractories, use in MMVF products and abrasives.
  • Dust from the calcination of bauxite in the production of pure alumina may be used.
  • bauxite containing Al (OH) 3 is calcined in a furnace.
  • Suitable furnaces include rotary kilns, stationary calciners, round kilns, shaft kilns and reverbatory furnaces, although rotary furnaces are most common.
  • Flue gas from this process contains fine solids which may be separated from the gas, for instance by filtration or electrostatic precipitation. The solids collected are the filter dust.
  • the coarse Al(OH) 3 is washed. It is then sent to the furnace, optionally after being dewatered and dried. Usually it is the flue gas from the furnace (e.g. rotary kiln) which provides the filter dust.
  • the furnace e.g. rotary kiln
  • the washed Al (OH) 3 is dewatered and dried, often in a flash dryer and often with hot gas. Solids and gas are separated so that solids are passed to further processing. However, some filter dust may be recovered from the gas at this stage either by filtration or electrostatic precipitation. This filter dust may be used as the particulate material in the invention. The solids then are passed to further heating stages to ensure calcination. From these stages the flue gas is also recovered and filter dust from this, obtained by filtration or electrostatic precipitation, may also be used in the invention.
  • the particulate alumina-containing material is filter dust obtained from processes of refractory production.
  • bauxite is calcined in a furnace such as a rotary kiln or a shaft furnace at temperatures of around 1,100 to 1,650°C. This sinters the bauxite and reduces its porosity.
  • the flue gas from this process is usually cleaned, for instance by a precipitator
  • the dust is obtained from precipitators used in such a process for cleaning the flue gas from a rotary kiln.
  • Filter dusts of these types may have (as received) particle size distribution as follows, in which case they can be used in the invention without modification: 30 to 60% below 60 microns 30 to 70% from 63 to 212 microns 5 to 20% from 125 to 250 microns 0.5 to 8% from 250 to 500 microns 0 to 3% from 0.5 to 1mm 0 to 1% above 1mm
  • the particulate material has content of alumina of from 50 to 99%, preferably 60 to 95%, more preferably 75 to 90%, eg 80 to 88%, by weight of the material.
  • the preferred filter dusts discussed above are particularly advantageous because they have chemical composition very similar to that of bauxite . They tend to have higher ignition loss, around 2 to 8%, in comparison with below 1% for calcined bauxite.
  • the particulate material before inclusion in the briquettes preferably has water content below 10% by weight based on dry weight of the material.
  • the preferred filter dusts generally have water content below 1%.
  • the fibres produced in the invention have high aluminium content (measured by weight of A1 2 0 3 ) , namely at least 14%, preferably at least 15%, more preferably at least 16% and in particular at least 18%. Generally the amount of aluminium is not more than 35%, preferably not more than 30%, more preferably not more than 26 or 23%.
  • the fibres and the melt from which they are formed have an analysis (measured as % by weight of oxides) of other elements within the various ranges defined by the following normal and preferred lower and upper limits :
  • Si0 2 at least 30, 32, 35 or 37; not more than 51, 48, 45 or 43
  • CaO at least 2, 8 or 10; not more than 30, 25 or 20 MgO: at least 2 or 5; not more than 25, 20 or 15 FeO (including Fe 2 0 3 ) : at least 2 or 5; not more than
  • FeO+MgO at least 10, 12 or 15; not more than 30, 25 or 20 Na 2 0+K 2 0: zero or at least 1; not more than 10
  • CaO+Na 2 0+K 2 0 at least 10 or 15; not more than 30 or
  • Ti0 2 zero or at least 1; not more than 6, 4 or 2
  • Ti0 2 +FeO at least 4 or 6; not more than 18 or 12 B 2 0 3 : zero or at least 1; not more than 5 or 3
  • P 2 0 5 zero or at least 1; not more than 8 or 5
  • the invention is of particular value in the production of fibres which can be shown to be soluble in physiological saline.
  • Suitable high aluminium, biologically soluble, fibres which can advantageously be made in the present invention are described in W096/14454 and W096/14274. Others are described in WO97/29057, DE-U-2970027 and WO97/30002. Reference should be made to each of these.
  • the fibres preferably have an adequate solubility in lung fluids as shown in vivo tests or in vitro tests, typically conducted in physiological saline buffered to about pH 4.5. Suitable solubilities are described in W096/14454. Usually the rate of dissolution is at least 10 or 20nm per day in that saline.
  • the fibres preferably have sintering temperature above 800°C, more preferably above 1000°C.
  • the melt preferably has a viscosity at fibre forming temperature of 5 to 100 poise, preferably 10 to 70 poise, at 1400°C.
  • the furnace is preferably a shaft furnace (as discussed above) in which a self-supporting stack of mineral material is heated and melt drains to the base of the stack. Usually it forms a pool from which it is run off to the fibre-forming process. In some cases the melt can be run from the base of the stack into another chamber where it collects as pool and from which it is run off to the fibre-forming process.
  • the preferred type of shaft furnace is a cupola.
  • the invention is preferably applied in a shaft furnace but it can provide benefits in other furnaces such as tank and electric furnaces in which a large pool of melt is provided into which the mineral charge is melted.
  • the charge includes briquettes.
  • the briquettes are made in known manner by molding a mix of the desired particulate materials (including the high alumina material) and a binder into the desired briquette shape and curing the binder.
  • the binder may be a hydraulic binder, that is one which is activated by water, for instance cement such as Portland cement .
  • Other hydraulic binders can be used as partial or complete replacement for the cement and examples include lime, blast furnace slag powder (JP-A-51075711) and certain other slags and even cement kiln dust and ground MMVF shot (US 4662941 and US 4724295) .
  • Alternative binders include clay.
  • the briquettes may also be formed with an organic binder such as molasses, for instance as described in W095/34514; such briquettes are described herein as form stones.
  • the invention has particular benefits when the briquettes include materials which are provided having moisture content, in particular moisture content above about 5%. These include power plant bottom ash, water quenched metallurgical slags, paper sludge and sewage sludge and MMVF waste. As discussed above the latter tends have a significant moisture content as a result of exposure to water during transfer from the base of the spinning chamber or other position in the production process from which it comes . MMVF waste obtained from the screw conveyor below the spinner tends to have moisture content around 5%. MMVF waste retrieved from the cleaning of the spinning chamber tends to have moisture content from 20 to 80%. Although these mineral wool wastes may be subjected to mechanical pressing prior to use, normally they are not otherwise dried.
  • the briquettes comprise at least 25 wt . % MMVF waste, preferably at least 45 wt . % . However, they generally do not comprise more than 80 wt . % and preferably comprise less than 65 wt.%.
  • moisture-containing materials may be present in amounts of up to 30 wt.% and include those mentioned above.
  • the moisture-containing materials such as MMVF waste tend to cause difficulty during the briquetting process in particular when the binder is molasses, although there can be problems with clay briquettes and to a lesser extent cement briquettes .
  • At least 10%, more preferably at least 15 or 20%, of the aluminium in the melt, measured by weight Al 2 0 3j is provided by the defined particulate aluminium- containing material.
  • the briquettes comprise the particulate aluminium- containing material. Generally all of the aluminium- containing particulate material included in the charge is included as a component of the briquettes.
  • briquettes generally contain (by weight) at least one significant (e.g. above 25%) proportion of the charge is in the form of briquettes.
  • the briquettes generally contain (by weight) at least one significant (e.g. above 25%) proportion of the charge is in the form of briquettes.
  • the briquettes generally contain (by weight) at least one significant (e.g. above 25%) proportion of the charge is in the form of briquettes.
  • the briquettes generally contain (by weight) at least
  • the defined aluminium-containing mineral preferably at least 10 or 15%. They may contain more than 20% but generally do not contain more than 45 or 50% of the defined aluminium-containing material.
  • the other materials in the briquettes and in the rest of the charge may be any suitable virgin or waste materials.
  • Suitable wastes include slags from the metallurgical industry, especially steelmaking slags such as converter slags or EAF slags, and slags from the ferro-alloy industry such as ferro-chromium, ferro-manganese or ferro-silica slags; slags and residues from the primary production of aluminium such as spent aluminium pot lining or red mud; dried or wet sludge from the paper industry; sewage sludge; molasses; bleaching clay; residues from the incineration of household and industrial wastes, especially slags or filter ashes from the incineration of municipal solid wastes; glass waste (or slags) from the vitrification of other waste products; glass cullet; waste products from the mining industry, especially minestone from the excavation of coal; residues from the incineration of fossil fuel, especially from the combustion of coal at power plants; spent abrasive sand; spent moulding sand from
  • the MMV fibres may be made from the fibre-forming mineral melt in conventional manner. Generally they are made by a centrifugal fibre- forming process. For instance the fibres may be formed by a spinning cup process in which they are thrown outwardly through perforations in a spinning cup, or melt may be thrown off a rotating disc and fibre formation may be promoted by blasting jets of gas through the melt . Preferably a cascade spinner is used and fibre formation is conducted by pouring the melt onto the first rotor in a cascade spinner.
  • the melt is poured onto the first of a set of two, three or four rotors, each of which rotates about a substantially horizontal axis, whereby melt on the first rotor is primarily thrown onto the second (lower) rotor although some may be thrown off the first rotor as fibres, and melt on the second rotor is thrown off as fibres although some may be thrown towards the third (lower) rotor, and so forth.
  • the MMV fibres may be used for any of the purposes for which MMVF products are known. These include fire insulation and protection, thermal insulation, noise reduction and regulation, construction, horticultural media, and reinforcement of other products such as plastics and as a filler.
  • the materials may be in the form of bonded batts (which may be flat or curved) or the materials may be comminuted into a granulate. Bonded batts include materials such as slabs and pipe sections.
  • the preferred materials may also be defined independently (but less preferably) in terms of their surface area. Therefore in a second aspect the invention provides a process of producing man-made vitreous fibres having a composition which contains at least 14% aluminium
  • briquettes comprise particulate alumina-containing material having size at least 90% below 700 ⁇ m, alumina content of at least 50 wt.% and multi-point surface area measured by BET analysis of at least 2 m 2 /g, preferably at least 10 m 2 /g.
  • this material and process have all of the preferred properties discussed above in connection with the first aspect of the invention, as well as the defined BET multi-point surface area.
  • the invention also provides briquettes (and processes for their production) containing the particulate alumina- containing materials discussed above, preferably at least 5 wt . % of these materials.
  • Example 1 Each of the examples below describes briquette components of a charge for a cupola furnace which can be incorporated into a melt which can be fiberised, for instance using a cascade spinner.
  • Example 2 This example sets out mercury porosimetry data for samples of a material suitable for use in the invention and comparative results for milled bauxite. The data was obtained using an Autopore II 9220 apparatus available from the company Micromeritics, using software version V3.03. Milled Bauxite
  • Penetrometer Number 14/0078 Advancing Angle: 130.0 deg Penetrometer Constant: 10.79 ⁇ L/pF Receding Contact Angle: 130.0 deg Penetrometer Weight: 63.6179 g Mercury Surface Tension: 485.0 dyn/cm Stem Volume: 0.4120 mL
  • Penetrometer Constant 21.63 ⁇ L/pF Receding Contact Angle: 130.0 deg Penetrometer Weight: 61.0300 g Mercury Surface Tension: 485.0 dyn/cm Stem Volume: 1.1980 mL
  • Figures 1 and 2 demonstrate the relationship between cumulative intrusion and pore diameter.
  • Figure 1 (for milled bauxite) shows that total cumulative intrusion is around 0.21 ml/g. Approximately 85% (0.18/0.21) is provided by pores of size above 1 ⁇ m, shown by the value of cumulative intrusion of 0.18 ml/g at 1 ⁇ m pore diameter. Therefore 100-85, namely approximately 15%, is provided by pores of size below 1 ⁇ m.
  • Figure 2 shows that approximately 36% porosity is provided by pores of diameter below 1 ⁇ m in the case of the filter dust of the invention (0.30 ml/g cumulative intrusion at 1 ⁇ m out of total 0.47 ml/g) .
  • the data below was measured by BET analysis by methods appropriate for determining the BET values preferred in the invention.
  • the data below sets out the properties, measured by BET, of samples of a material suitable for use in the invention and comparative results for milled bauxite.
  • the data was obtained using a Gemini No. 2360 apparatus, available from the company Micromeritics. Software used was version 2.01. Milled Bauxite

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Glass Compositions (AREA)

Abstract

La présente invention concerne des fibres vitreuses synthétiques contenant au moins 14 % Al2O3 obtenues en fusionnant une charge minérale comprenant des briquettes et en procédant au fibrage de la coulée. Au cours du procédé, les briquettes comprennent un matériau contenant de l'alumine particulaire présentant une taille en-dessous de 700 νm sur au moins 90 % du poids, une teneur de Al2O3d'au moins 50 % en poids et au moins 20 %, de préférence au moins 25 %, de porosité assurée par des pores d'un diamètre de moins de 1 νm, mesurée par porosimétrie au mercure. En outre, cette invention concerne des briquettes et leurs procédés de fabrication.
EP00947836A 1999-06-10 2000-06-07 Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production Withdrawn EP1192112A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00947836A EP1192112A1 (fr) 1999-06-10 2000-06-07 Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99304552 1999-06-10
EP99304552 1999-06-10
EP00947836A EP1192112A1 (fr) 1999-06-10 2000-06-07 Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production
PCT/EP2000/005281 WO2000076929A1 (fr) 1999-06-10 2000-06-07 Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production

Publications (1)

Publication Number Publication Date
EP1192112A1 true EP1192112A1 (fr) 2002-04-03

Family

ID=8241446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00947836A Withdrawn EP1192112A1 (fr) 1999-06-10 2000-06-07 Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production

Country Status (5)

Country Link
EP (1) EP1192112A1 (fr)
AU (1) AU6149400A (fr)
HU (1) HUP0300503A3 (fr)
PL (1) PL352713A1 (fr)
WO (1) WO2000076929A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2254540T3 (es) * 2001-02-21 2006-06-16 DEUTSCHE ROCKWOOL MINERALWOLL GMBH & CO. OHG Procedimiento para fabricar materiales aislantes de fibras minerales.
EP1558532A1 (fr) * 2002-11-06 2005-08-03 Rockwool International A/S Procede de preparation d'une masse minerale fondue
WO2006015647A1 (fr) * 2004-08-09 2006-02-16 Deutsche Rockwool Mineralwoll Gmbh & Co. Ohg Procede pour produire une masse fondue minerale et brique moulee
WO2006015846A1 (fr) * 2004-08-09 2006-02-16 Deutsche Rockwool Mineralwoll Gmbh & Co. Ohg Procede pour produire une matiere fondue minerale et des briques moulees
ES2316241B1 (es) * 2006-06-01 2009-12-30 Universidade De Santiago De Compostela Procedimiento para la obtencion de fibras vitreas a partir de residuos de pizarra y otros residuos industriales.
EP2443074A1 (fr) * 2009-06-19 2012-04-25 Rockwool International A/S Procédé de traitement de laine de roche
EP2415721A1 (fr) * 2010-07-30 2012-02-08 Rockwool International A/S Corps compacté à utiliser en tant que charge minérale dans la production de laine minérale

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9525641D0 (en) * 1995-12-15 1996-02-14 Rockwool Int Production of mineral fibres
FI960705A (fi) * 1996-02-16 1997-08-17 Paroc Oy Ab Mineraalikuitu
US6067821A (en) * 1996-10-07 2000-05-30 Owens Corning Fiberglas Technology, Inc. Process for making mineral wool fibers from lumps of uncalcined raw bauxite
AU5765798A (en) * 1997-01-11 1998-08-03 Deutsche Rockwool Mineralwoll-Gmbh Inorganic binder
DE98965734T1 (de) * 1997-12-02 2007-01-18 Rockwool International A/S Briketts für die mineralfaserherstellung und deren verwendung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0076929A1 *

Also Published As

Publication number Publication date
PL352713A1 (en) 2003-09-08
HUP0300503A3 (en) 2005-02-28
HUP0300503A2 (hu) 2003-06-28
WO2000076929A1 (fr) 2000-12-21
AU6149400A (en) 2001-01-02

Similar Documents

Publication Publication Date Title
CA2312838C (fr) Briquettes pour la production de fibres minerales et leur utilisation
WO2006074946A2 (fr) Agregats de synthese comprenant des boues d'epuration et d'autres dechets et procedes pour produire des agregats de ce type
CA2506769C (fr) Procede de preparation d'une masse minerale fondue
WO2008046074A2 (fr) Composition d'agent de soutènement et de matière granuleuse au ferrosilicate
EP1192112A1 (fr) Briquettes, leur utilisation dans la fabrication de fibres minerales et leur production
EP0866776B1 (fr) Production de fibres minerales
RU2374206C1 (ru) Сырьевая смесь и способ изготовления керамических изделий
JP2007261880A (ja) 焼結物の製造方法
EP1036041B1 (fr) Procede de production de fibres vitreuses
EP0766653B1 (fr) Production de fibres minerales
WO1999028249A1 (fr) Procede et dispositif de production de fibres vitreuses
EP1065176A1 (fr) Production de fibres vitreuses synthétiques
RU2365542C2 (ru) Способ изготовления изоляционных материалов из минеральных волокон и засыпка для плавильного агрегата для получения минерального расплава
JP2003095713A (ja) 無機質固化体の製造方法
CN107377867A (zh) 一种铸钢涂料及其制备方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20011212

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB LI

AX Request for extension of the european patent

Free format text: AL;LT PAYMENT 20011227;LV;MK;RO;SI PAYMENT 20011227

17Q First examination report despatched

Effective date: 20030722

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20040203