SI9600242A - ARTIFICIAL MINERAL FIBERS WITH Ki>40 AND PROCES FOR THEIR PREPARATION - Google Patents

Abstract

Artificial mineral fibres with Ki > 40 and the mean thickness of 5 micrometres to 9 micrometres in which the raw materials for the preparation of artificial mineral fibres with the briquetting procedure are transformed into briquettes, suitable for the melting in the cupola furnace at 1300 degrees Centigrade to 1500 degrees Centigrade and defibrating on the system of counter-rotating 2, 3 or 4 wheels and with the use of an intermediate after heat pan, additional after heat heaters on wheels and discharge on wheels and low pressure in the collecting chamber; the chemical composition of the mineral fibres is determined with the following ratios of oxides in percentage by weight: X(SiO2)=39-54.1 % by weight, X(CaO)=26-35 % by weight, X(MgO)=12-18 % by weight, X(BaO)=0-4 % by weight, X(TiO2)=0-0.2 % by weight, X(Fe2O3)=0.3-4.5 % by weight, X(Na2O)+ X(K2O)=0-5.1 % by weight, X(Al2O3)=0.8-3.1 % by weight, residue less than 1 % by weight.

Description

Artificial mineral fibers with Ki> 40 and process for their preparation

The present invention relates to new mineral fibers with Ki> 40 and to a process for their preparation. The fibers are distinguished by their good insulation properties, temperature resistance and biodegradability.

BACKGROUND OF THE INVENTION

Artificial mineral fibers based on magmatic rocks with a feedstock ratio of e.g. 65 - 70% by weight of diabase and 30-35% by weight of dolomite and chemical composition of 40 - 45% by weight of SiO ₂ , 14 - 17% by weight of A1 ₂ O ₃ , 20 - 35% by weight (CaO + MgO), 2 - 5 wt.% (K ₂ O + Na ₂ 0), 5 - 10 wt.% Fe ₂ O3 are used for thermal and acoustic insulations in construction and engineering.

The introduction of harsh protective measures in the production and use of hazardous materials has in recent years also affected the field of fibrous materials, both natural and man-made, organic and inorganic (V. Draeger, Gesundheitliche Aspekte bei der Herstellung und Verarbeitung von Mineralwolle - Erzeugnisah, insbesonderere) -Dammstoffen, Baustoffindustrie, 6 November (1990), 178-180). Their geometric resemblance to asbestos fibers was a sufficient reason for listing them as potentially dangerous in the first phase and then being declared carcinogenic (F. Pott. KH Friedrichs, Tumoren der Ratte nach ip - Injection faserformiger Staube, Naturwiss. 59 (1972) 318, C. Haefner, Erzeugen MineralwollDammstoffe beim Menschen Krebs ?, Zbl. Arbeitsmed. 42 (1992), 236-240).

According to the International Agency for Research on Cancer (IARC), asbestos fibers are classified in Group 1 - materials that are carcinogenic to humans. According to this same classification, mineral and glass fibers are classified in Group 2B - the material may be carcinogenic to humans. According to various proposals for the classification of inorganic and organic fibers, since February 1993, all those fibers which, in terms of geometry, meet the following criteria are considered to be potentially dangerous: length> 5 mm, diameter <3 mm, length / diameter ratio> 3. For work Products containing mineral fibers of the following dimensions are subject to the provisions of the Decree on Dangerous Substances (Regeln fur Sicherheit und Gesundheitsschutz beim Umgang mit kunstli chen Mineralfasem (GUV 19.14), Bundesverband der Unfallversicherungstrager der Offentlichen 1994 A B Hand. Harmfulness assessment. the carcinogenicity of natural or mineral fiber powders is given in TRGS 905, Technical Rules for Hazardous Substances, and has also been published in the German Official Journal of Labor. (Bundesarbeitsblatt 6/1994, Technische Regeln fur Gefahrstoffe, TRGS 905, Verzichnis krebserzeugender, E rbsgut verandernd. Oder fortpflanzungsgefahrdender Stoffe (Bekantruachung des BMA nach § 52 Abs. 3 Gefahrstofverordung 1995, 1995).

The rating applies to fibers of length> 5 pm, diameter <3 pm and length to diameter ratio> 3: 1 (WH0 fibers). The fiber assessment by category is also expressed on the basis of the carcinogenicity index, given by the ratio:

Ki = Σ Na ₂ 0, K ₂ O, B ₂ O ₃ , CaO, MgO, BaO - 2xA1 ₂ O ₃

- vitreous WH0 fibers of Ki <30 are to be classified as Category 2 carcinogenic;

- vitreous WH0 fibers of 30 <Ki <40 are to be classified in Category 3 and are conditionally carcinogenic;

- vitreous WH0 fibers with Ki> 40 have no classification, they are not carcinogenic.

Classification of glassy WH0 fibers may also be performed on the basis of a carcinogenicity test with intraperitoneal administration, in particular if fibers with a size distribution typical of the workplace are tested. Such analysis is especially recommended for WH0 fibers with 25 <Ki <40 (conditionally carcinogenic).

Documents WO 95/35265, WO 95/32925, WO 95/32926, WO 96/0413, WO 95/31410, WO 95/32927 and SK 780-95 describe the composition of mineral and glass fibers having high biological solubility in compared to standard mineral fibers and are conditionally carcinogenic according to the above classification (TRGS 905). These fibers require specific demonstration of harmlessness with increased biological solubility and are therefore not comparable to the present invention.

SUBJECT MATTER OF THE INVENTION

The invention relates to the chemical composition, raw materials used and technological process for the production of artificial mineral fibers characterized by Ki-factors higher than 40, good insulating properties, temperature resistance and biodegradability. The object and object of the invention is to make artificial mineral fibers from such a raw material cartridge, which is converted into a mold by the briquetting process, suitable for melting in a dome oven at temperatures of 1300 ° C -1500 ° C and stretching on the system anti-rotating 2,3 or 4 wheels, whereby an intermediate heating pan can be used before the melt is folded to ensure homogeneity and constant temperature to the wheels of the melt in contact. The artificial mineral fibers thus produced have a controlled and defined average diameter and length of the fibers, which is ensured by the use of additional burners for heating the wheels of the emerging mineral fibers and by the blowing of the emerging fibers from the wheels and by directing the pressure in the collecting chamber. Mineral fibers made from a feedstock defined in this way and made using the technology described have a chemical composition in which the weight ratio of the oxides is such that it meets in each applicable requirement a Ki> 40. Artificial mineral fibers manufactured and products thereof, such as felts, sheets and moldings, have a thermal conductivity with a density of 0.035 to 0.040 W / mK, a permissible permanent use temperature higher than 700 ° C and a melting point above I000 ° C. According to the invention, the problem is solved with artificial mineral fibers based on different feedstocks, consisting of different basic components described in the embodiments, but always in such a ratio that after melting them in the dome furnace and melting the melt into centrifuge fibers the composition of the resulting artificial mineral fibers, expressed by the following X-ratio of oxides by weight:

X (SiO ₂ ) = 35-54 wt.% X (CaO) = 24-36 wt.% X (MgO) = 8-20 wt.% X (BaO) = The scoreboard is now 0-4 wt.% X (TiO ₂ ) = o-i,: 'Wt.% X (Fe ₂ O ₃ ) = 0.3-6 wt.% X (At ₂ O) = 0-10 wt.% X (K ₂ O) = 0-10 wt.% X (A1 ₂ O ₃ ) less as 5 wt.% The rest less as 1 wt.%

where:

(At ₂ O + K ₂ O) = 0-10 wt.% (CaO + MgO) = 32-54 wt.% BaO = 0- 4 wt.% PbO 0- 0.2 wt.% B ₂ O ₃ ⁼ 0-7 wt.% p ₂ 0 ₅ 0- 0.8 wt.% TiO ₂ 0- 1.2 wt.% Mn ₂ O ₃ = 0- 1.5 wt.% Cr ₂ O ₃ ⁼ 0-1 wt.%

Compared to the known artificial mineral fibers, the object of the invention differs from them in the substantially changed raw material design, the applied briquetting technology in connection with the melting in the dome and the melting of the centrifuge while simultaneously using an intermediate heating pan and additional heating blowers to warm up the mineral fibers. with a chemical composition designed to contain a high proportion of alkaline earth oxides, in particular MgO and CaO, to provide manufactured artificial mineral fibers with good thermal and acoustic insulation properties, a permanent temperature of use above 700 ° C, and such chemical composition that in each the combination of the surines used provides artificial mineral fibers manufactured with a Ki value of> 40 with respect to the weight ratio of the oxides and an average fiber thickness of between 5 μτη and 9 / cm.

The invention is explained, but by no means limited, by the following Examples.

EXECUTIVE EXAMPLES

Example 1:

'k

Mixture of basic raw materials in a weight ratio of 10% diabase, 25% dunite, 20% wollastonite, 25% dolomite, 10% waste glass and 10% cement after homogenisation of the mixture and briquetting of the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and 1500 ° C gives a melt that can be swathed on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO ₂ = 40,5% A1 ₂ O ₃ = 2.9% Fe ₂ O ₃ = 3.7% CaO = 28.5% MgO = 19.8% BaO = 0.2% TiO ₂ = 0.2% At ₂ O + K ₂ O = 3.1% Cr ₂ O ₃ s 0.4% Mn ₂ O ₃ = 0.1% Other less as 0.6%

The artificial mineral fibers produced had a Ki = 46.0 factor and an average fiber diameter between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.037 W / mK and the upper permanent use temperature is higher than 730 ° C.

Example 2:

A mixture of basic materials by weight of 10% diabase, 35% dunite, 30% limestone, 15% glass, 10% cement after homogenizing the mixture and briquetting the mixture into briquettes for filling the dome furnace after melting between 135 ° C and 1500 ° C gives a melt, which is folded on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO ₂ = 39.9% A1 ₂ O ₃ = 3.1% Fe ₂ O ₃ = 4,5% CaO = 29.3% MgO = 17.9% BaO = 0.3% TiO ₂ = 0.2% At ₂ O + K ₂ O = 3.8% Cr ₂ O ₃ = 0.5% Mn ₂ O ₃ = 0,1% The rest less than 0.4%

The artificial mineral fibers produced had a factor Ki = 44.8 and an average fiber diameter between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.036 W / mK and the upper permanent use temperature is higher than 720 ° C.

Implementing, examples;

A mixture of basic raw materials in a weight ratio of 10% diabase, 35% dunite, 25% limestone, 10% glass, 10% cement after homogenizing the mixture and briquetting the mixture into briquettes for filling the dome furnace after melting between 135 ° C and 1500 ° C gives a melt, which is folded on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO2 = 39,4% A1 ₂ O ₃ = 3.5% Fe ₂ O ₃ = 5.0% CaO = 28.1% MgO = 19.2% BaO - 0.2% TiO ₂ = 0.2% At ₂ O + K ₂ O = 3.1% Cr ₂ O ₃ = 0.5% Mn ₂ O ₃ = 0.1% The rest less than 0.7%

The artificial mineral fibers produced had a Ki = 43.6 factor and an average fiber diameter of 6.5 pm to 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.039 W / mK and the upper permanent use temperature is higher than 740 ° C.

Example 4

Mixture of basic raw materials by weight of 35% diabase, 5% SiO ₂ , 30% dolomite, 10 limestone, 10% glass, 10% cement after homogenization of the mixture and briquetting of the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and 1500 ° C gives a melt that can be swollen on a system of counter-rotating wheels with or without the use of an intermediate dosing pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO ₂ = 35.0% A1 ₂ O ₃ = 5.0% Fe ₂ O3 = 6.0% CaO - 35,5% ' MgO = 14.0% BaO = 0.2% TiO ₂ = 1.2% At ₂ O + K ₂ O = 2.4% Mn ₂ 0s = 0.2% The rest less than 0.5%

The artificial mineral fibers produced had a Ki = 42.1 factor and a mean fiber diameter between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.038 W / mK and the upper permanent use temperature is higher than 740 ° C.

Example 5

A mixture of basic raw materials in a weight ratio of 20% SiO ₂ , 60% dolomite, 10% glass, 10% cement after homogenization of the mixture and briquetting of the mixture into briquettes for filling the dome furnace after melting between 135O ° C and 1500 ° C gives a molten metal on a system of counter-rotating wheels, with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fiber heating, having the following chemical composition by weight:

SiO ₂ = 40.6% AI2O3 = 1.5% Fe ₂ O ₃ = 0.7% CaO = 35,8% MgO = 18.2% BaO 0.3% TiO ₂ = 0.2% At ₂ O + K ₂ O = 2.4% The rest less than 0.3%

The artificial mineral fibers manufactured had a Ki = 53.7 factor and an average fiber diameter of 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.036 W / mK and the upper permanent use temperature is higher than 800 ° C.

Example 6

A mixture of basic raw materials in a weight ratio of 5% SiO ₂ , 30% dolomite, 55% glass, 10% cement after homogenization of the mixture and briquetting of the mixture into briquettes for filling the dome furnace after melting between I350 ° C and 1500 ° C gives a melt which is leached on a system of counter-rotating wheels, with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fiber heating, having the following chemical composition by weight:

SiO ₂ = 54.1% A1 ₂ O ₃ = 1.3% Fe ₂ O ₃ = 0.5% CaO = 24.0% MgO = 8.1% BaO = 1.3% TiO-> ₌ 0.1%

At ₂ O + K ₂ O = 10.0%

Other less than 0.6%

The artificial mineral fibers produced had a Ki = 40.8 factor and an average fiber diameter between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.038 W / mK and the upper permanent use temperature is higher than 700 ° C.

Example 7

A mixture of basic raw materials in a weight ratio of 20% SiO ₂ , 45% dolomite, 25% glass and 10% cement after homogenizing the mixture and briquetting the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and 1500 ° C gives a molten metal on a system of counter-rotating wheels, with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fiber heating, having the following chemical composition by weight:

SiO ₂ = 50.2% A1 ₂ O ₃ = 1.4% Fe ₂ O ₃ = 0.5% CaO = 28,9% MgO = 12,3% BaO = 0.6% At ₂ O + K ₂ O = 5.1% TiO ₂ = 0.2% The rest less than 0.8%

The artificial mineral fibers produced had a Ki = 44, l factor and an average fiber diameter of between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.040 W / mK and the upper permanent use temperature is higher than 760 ° C.

Example 8

A mixture of basic raw materials in a weight ratio of 24% SiO ₂ , 45% dolomite, 10.5% glass, 20% cement and 0.5% Mn ₂ O ₃ after homogenisation of the mixture and briquetting of the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and 1500 ° C gives a melt that can be rolled out on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO ₂ = 45.4% A1 ₂ O ₃ = 1.4% Fe ₂ O ₃ = 0.6% CaO = 35,0% MgO = 12,5% BaO = 0.4% At ₂ O + K ₂ O = 3.1% TiO ₂ = 0.2% Mn ₂ O ₃ = 0.5% PbO = 0.1% The rest less than 0.8%

The artificial mineral fibers produced had a Ki = 48.2 factor and a mean fiber diameter between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.037 W / mK and the upper permanent use temperature is higher than 740 ° C.

Case Study 9

Mixture of basic raw materials by weight of 20.5% SiO ₂ , 47% dolomite, 19.6% glass, 9.4% cement and 3.5% barium carbonate after homogenisation of the mixture and briquetting of the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and l $ 00 ° C gives a melt that can be swathed on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO ₂ = 46.7% A1 ₂ O ₃ = 1.3% Fe ₂ O ₃ = 0.4% CaO = 29.3% MgO 13.1% BaO = 4.0% At ₂ O + K ₂ O = 3.8% TiO ₂ = 0.2% Mn ₂ O ₃ = 0.2% The rest less than 1.0%

The artificial mineral fibers produced had a Ki = 47.6 factor and an average fiber diameter of between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.036 W / mK and the upper permanent use temperature is higher than 730 ° C.

Example 10

A mixture of basic raw materials by weight of 26.3% SiO ₂ , 49.1% dolomite, 12.1% glass, 10.7% cement, 0.8% Cr ₂ O ₃ and 1% apatite after homogenisation of the mixture and briquetting of the mixture in briquettes for filling a dome furnace after melting between 1350 ° C and 1500 ° C gives a melt that can be folded on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for heating into artificial mineral fibers with the following chemical composition in percentage by weight:

SiO ₂ = 46.9% A12O3 = 1.7% Fe ₂ O ₃ = 0.4% CaO = 30.2% MgO = 14.3% At ₂ O + K ₂ O = 1.9% Cr ₂ O ₃ = 1.0% TiO ₂ = 1.0% P ₂ O ₅ = 0,8% PbO = 2.0% The rest less than 0.7%

The artificial mineral fibers produced had a Ki = 43.4 factor and an average fiber diameter of between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.039 W / mK and the upper permanent use temperature is higher than 730 ° C.

Example 11

Mixture of basic raw materials by weight of 34% SiO2, 45% dolomite, 9.5% glass, 10% cement, 0.3% Cr ₂ O3 and 1.2% Mn ₂ O3 after homogenisation of the mixture and briquetting of the mixture into dome briquettes After melting between 1350 ° C and I500 ° C, the furnace is meltable on a counter-rotating wheel system with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fibers with the following chemical composition by weight:

SiO ₂

AI2O3

Fe ₂ C> 3

54.1%

0,8%

0.3%

CaO = Ί / and <4 26, S% MgO = 12,5% BaO = 0.4% At ₂ O + K ₂ O = 2.5% Cr ₂ O3 = 0.3% Mn ₂ O3 = 1.5% The rest less than 0.7%

The artificial mineral fibers produced had a Ki = 40.6 factor and an average fiber diameter between 6.5μπι and 8.0μπι depending on the stretching conditions. The thermal conductivity of such artificial mineral fibers is 0.035 W / mK and the upper permanent use temperature is higher than 740 ° C.

Example 12

Mixture of basic raw materials in a weight ratio of 32.7% SiO ₂ , 35.9% dolomite, 9.0% glass, 11.0% cement, 11.0% destructible, 0.2% CriOj and 0.2% Mn ₂ O3 after homogenisation of the mixture and briquetting the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and 1500 ° C, it gives a melt which can be folded on a system of counter-rotating wheels with or without the use of an intermediate heating pan and with or without additional heaters for heating in artificial mineral fibers, having the following chemical composition by weight:

SiO ₂ = 52,1% A1 ₂ O ₃ = 1.3% Fe ₂ O ₃ = 0.5% CaO = 25.7% MgO = 9,8% BaO = 0.2% At ₂ O + K ₂ O = 1.9% Cr ₂ O3 = 0.2% TiO ₂ = 0.1%

MmOs = -0.2% PbO 0.1% b ₂ o ₃ = 7.0% The rest less than 0.9%

The artificial mineral fibers produced had a Ki = 42.0 factor and a mean fiber diameter between 6.5pm and 8.0pm depending on the chemical conditions. The thermal conductivity of such artificial mineral fibers is 0.039 W / mK and the upper permanent use temperature is higher than 700 ° C.

Example 13

A mixture of basic raw materials with a weight ratio of 66.7% v / ollastonite and 33.3% dunite after homogenizing the mixture and briquetting the mixture into briquettes for filling the dome furnace after melting between 135 ° C and 1500 ° C gives a melt. rotating wheels, with or without the use of an intermediate heating pan, and with or without additional heaters for artificial mineral fiber heating, having the following chemical composition by weight:

SiO, - 50,0% AI2O3 = 0.9% Fe, O ₃ = 2.5% CaO = 31.9% MgO = 13.5% Cr ₂ O ₃ = 0.5% The rest less than 0.7%

The manufactured artificial mineral fibers had a Ki = 43.6 m average fiber diameter between 7.2um and 9.1 um, depending on the chemical conditions.

The thermal conductivity of such artificial mineral fibers is 0.039 W / mK. the upper permanent use temperature being higher than 760 ° C.

Example 14

Mixture of basic raw materials in a weight ratio of 10% diabases, 25% SiO ₂ , 10% dolomite, 18% limestone, 8% glass, 10% cement, 15% magnesite, 3% destructible, 0.5% Mn ₂ O ₃ and 0, 5% Cr ₂ O ₃ after homogenisation of the mixture and briquetting the mixture into briquettes for filling the dome furnace after melting between 1350 ° C and 1500 ° C gives a melt which is extruded on a counter-rotating wheel system with or without the use of an intermediate heating pan and with or without additional heaters for artificial mineral fiber heating, having the following chemical composition by weight:

SiO ₂ 47,9% A1 ₂ O ₃ 2.5% Fe ₂ O ₃ 1.9% CaO 27.4% MgO 13,8% BaO 0.2% TiO ₂ 0.2% At ₂ O + K ₂ O = 2.1% Mn ₂ O ₃ = 0.6% Cr ₂ O ₃ 0.6% B ₂ O ₃ = 1.8% Other less than 1.0%

The artificial mineral fibers produced had a Ki = 40.3 factor and a mean fiber diameter of 6.7 / wm and 9.4 / wm according to the stretching conditions, according to their chemical composition. The thermal conductivity of such artificial mineral fibers is 0.038 W / mK and the upper permanent use temperature is higher than 740 ° C.

Claims (1)

PATENT APPLICATION Artificial mineral fibers of Ki> 40 and an average thickness of 5 pm to 9 pm, characterized in that the raw materials for the production of artificial mineral fibers are converted into briquettes by briquetting process, suitable for melting in a dome oven at 1300 ° C to 1500 ° C, and roll-over on a 2, 3 or 4 wheel counterbalancing system, using an intermediate heat sink, additional hot air heaters on wheels and blowers on the wheels and vacuum in the sump chamber, and that the chemical composition of the artificial mineral fibers is determined by the following proportions of oxides by weight: X (SiO ₂ ) = 39-54.1 weight% X (CaO) = 26-35 weight% X (MgO) = 12 -18 weight% X (BaO) = 0-4 weight% X (TiO ₂ ) = 0 -0.2 wt% X (Fe ₂ O ₂ ) = 0.3 - 4.5 wt% X (Na ₂ O) + X (K ₂ O) = 0-5.1 wt% X (A1 ₂ O ₃ ) = 0.8 - 3.1% by weight remaining less than 1% by weight. For: TERMO d.d. CITY, rf. ο / e. IUP Ljabijana ' ABSTRACT Artificial mineral fibers with Ki> 40 and process for their preparation Artificial mineral fibers with Ki> 40 and an average thickness of 5 pm to 9 pm, in which the raw material for the manufacture of artificial mineral fibers is converted into briquettes by briquetting, suitable for melting in a dome oven at 1300 ° C to 1500 ° C anti-rotating 2, 3 or 4 wheels, using an intermediate heat sink, additional hot air heaters on wheels and blowers on wheels and vacuum in the sump chamber, and that the chemical composition of artificial mineral fibers is determined by the following proportions of oxides by weight: X (SiO ₂ ) = 39 - 54.1% by weight X (CaO) = 26 -35 weight% X (MgO) = 12-18 weight% X (BaO) = 0-4 weight% X (TiO ₂ ) = 0-0.2 weight% X (Fe ₂ O ₃ ) = 0.3 - 4.5 wt% X (Na ₂ O) + X (K ₂ O) = 0-5.1 wt% X (A1 ₂ O ₃ ) = 0.8 - 3.1 wt% residual less as 1 weight%.