# US 4,381,348 A · Blue colored artificial stone stocks and method of manufacturing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,381,348 A
- Document ID: US4381348A
- Status: Granted
- Kind: A
- Application number: 06/335,186
- Filed: 1981-12-28
- Granted: 1983-04-26
- Earliest claimed: 1980-12-29
- Assignees: Nippon Kokan Kabushiki Kaisha
- Inventors: Toshio Kamatani; Hirohisa Ishiguro; Kensei Itakura; Kazuo Yamagishi
- Web page: https://patentgrep.com/patent/US4381348A

## CPC

- C03C 10/0063: {containing waste materials, e.g. slags}
- C03C 1/002: {Use of waste materials, e.g. slags}
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 10/0045: {containing SiO2, Al2O3 and MgO as main constituents}
- C04B 5/00: Treatment of {metallurgical} slag (manufacture of slag wool C03B; in, or for, the production of metals C21B, C22B); Artificial stone from molten {metallurgical} slag {(other cast stone C04B32/005; mechanical aspects B28B1/54)}
- C04B 5/06: Ingredients, other than water, added to the molten slag {or to the granulating medium or before remelting}; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
- C04B 32/005: {Artificial stone obtained by melting at least part of the composition, e.g. metal (C04B28/36 and C03C take precedence; cast stone from molten slag C04B5/00; artificial stone obtained by melting the polymeric ingredient of the composition C04B26/00)}
- 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
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A low cost beautiful blue colored artificial stone stock is obtained by using a high carbon or low carbon slag formed at the time of preparing ferrochromium, as it is or after incorporated with an expensive addition. The stone stock has a composition of 40-70% by weight of SiO.sub.2, 0.1-5% by weight of a low grade chromium oxide and the balance of CaO, MgO and Al.sub.2 O.sub.3.

## Claims

### Claim 1

A blue colored artificial stone stock containing 40-70% by weight of SiO.sub.2, 0.1-5% by weight of chromium oxide having an oxidation number up to 2 and the balance of CaO, MgO and Al.sub.2 O.sub.3.

### Claim 2

A blue colored artificial stone stock containing 40-70% by weight of SiO.sub.2, 0.1-5% by weight of chromium oxide having an oxidation number up to 2, 5-15% by weight of CaO, 17-23% by weight of MgO and 6-20% by weight of Al.sub.2 O.sub.3.

### Claim 3

A method of manufacturing a blue colored artificial stone stock comprising the steps of:
preparing a raw material selected from the group consisting of a high carbon ferrochromium slag, a low carbon ferrochromium slag and a silicochromium slag and mixture thereof;
adding SiO.sub.2 and a reducing agent to said raw material;
melting the resulting mixture;
adjusting the composition of the molten mixture so that it contains 40 to 70% by weight of SiO.sub.2 and 0.1 to 5% by weight of chromium oxide having an oxidation number up to 2; and
then slowly cooling the molten mixture to form said blue colored artificial stone stock.

### Claim 4 (depends on 3)

The method according to claim 3 wherein said cooling is effected at a rate of less than 10.degree. C./min.

### Claim 5

A method of manufacturing a blue colored artificial stone stock comprising the steps of:
preparing a raw material mixture of a chromium containing mineral, a silicon containing mineral and a reducing agent;
the quantity of Cr.sub.2 O.sub.3 in said raw material being 4-8% by weight and the quantity of said reducing agent being 1.4-1.8 times the stoichiometric quantity necessary to reduce said Cr.sub.2 O.sub.3 to CrO;
melting said raw material to form a molten mixture; and adjusting the composition of said molten mixture so that it contains 40-70% by weight SiO.sub.2 and 0.7-1.9% by weight total chromium.

### Claim 6 (depends on 5)

The method according to claim 5 wherein when said raw material contains an iron oxide, and the quantity of said reducing agent is 1.4-1.8 times the stoichiometric quantity necessary to reduce said Cr.sub.2 O.sub.3 and said iron oxide to CrO and Fe.

### Claim 7 (depends on 5)

The method according to claim 5 wherein said raw material comprises a slag formed at the time of preparing ferrochromium.

### Claim 8 (depends on 5, 6)

The method according to claim 5 or 6 wherein said reducing agent comprises coke.

### Claim 9 (depends on 3)

The method of claim 3 wherein said molten mixture contains between 48 and 60% SiO.sub.2, and between 0.3 and 3% of said chromium oxide, and wherein said reducing agent comprises coke.

### Claim 10 (depends on 1, 2)

The blue colored artificial stone stock according to claim 1 or 2 which contains between 48 and 60% SiO.sub.2, and between 0.3 and 3% of said chromium oxide.