# US 2023/0057024 A1 · Method for producing mineral wool

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- Number: US 2023/0057024 A1
- Document ID: US20230057024A1
- Status: Published application
- Kind: A1
- Application number: 17/784,310
- Filed: 2020-12-09
- Published: 2023-02-23
- Earliest claimed: 2019-12-11
- Assignees: Saint-Gobain Isover
- Applicants: Saint-Gobain Isover
- Inventors: Andrea GIOIA
- Web page: https://patentgrep.com/patent/US20230057024A1

## CPC

- C03C 13/06: Mineral fibres, e.g. slag wool, mineral wool, rock wool
- C03B 5/02: in electric furnaces {, e.g. by dielectric heating (electric heating in general H05B)}
- C03B 5/2356: {Submerged heating, e.g. by using heat pipes, hot gas or submerged combustion burners (bubblers C03B5/193)}
- C03B 37/04: by using centrifugal force {, e.g. spinning through radial orifices; Construction of the spinner cups therefor (bonder application C03C25/00)}
- C03C 1/002: {Use of waste materials, e.g. slags}
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/11: containing halogen or nitrogen
- C03C 4/0014: {Biodegradable glass}
- C03C 2213/00: Glass fibres or filaments
- Y02P 40/50: Glass production, e.g. reusing waste heat during processing or shaping
- 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
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to a method for producing mineral wool having a chemical composition, expressed as a percentage by weight of oxides, comprising: SiO2 30-50% Al2O3 15-35% CaO 5-25% MgO 1-25% Fe2O3 2-15% Na2O + K2O >10% said method comprising providing a mixture of raw materials, melting said mixture of raw materials to obtain a molten material, and fiberizing the molten material; characterized in that the mixture of raw materials comprises at least 8.5% by weight of a recycled raw material comprising at least 3% of magnesium, expressed by weight of oxides, said recycled raw material being substantially free of carbonates, and in that the mixture of raw materials is free of dolomite and magnesia.

## Claims

### Claim 1

A method for producing mineral wool having a chemical composition, expressed as a percentage by weight of oxides, comprising:
[[SiO2]] SiO2
30-50%;
Al2O3
15-35%;
CaO
5-25%;
MgO
1-25%;
Fe2O3
2-15%; and
Na2O + K2O
>10%,
said method comprising:
melting a mixture of raw materials to obtain a molten material; and
fiberizing the molten material;
wherein the mixture of raw materials is in pulverulent form and comprises at least 8.5% by weight of a recycled raw material comprising at least 3% of magnesium, expressed by weight of oxides, said recycled raw material being substantially free of carbonates, and wherein mixture of raw materials is free of dolomite and magnesia.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the chemical composition of the mineral wool comprises less than 0.1% by weight of halogen.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the recycled raw material comprises less than 0.9% by weight of halogen.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the recycled raw material is free of fluorine.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the recycled raw material comprises up to 2% by weight of aluminum metal.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the recycled raw material has a chemical composition, expressed by weight of oxides, comprising:
Al2O3
50 to 80%;
[[SiO2]] SiO2
2 to 25%;
MgO
3 to 20%;
Fe2O3
0.5 to 10%.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the recycled raw material has a chemical composition, expressed by weight of oxides, in which a weight ratio of Al2O3/MgO is greater than 8.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the mixture of raw materials does not comprise briquettes.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the mixture of raw materials comprises at least 1% by weight of bauxite.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the mixture of raw materials is melted in a fuel-fired furnace and/or by electric melting.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the fiberizing is carried out by internal centrifugation.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the recycled raw material comprises less than 0.6% by weight of halogen.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the mixture of raw materials is melted in a submerged combustion furnace.