Blue colored artificial stone stocks and method of manufacturing the same
AssigneeNippon Kokan Kabushiki Kaisha
InventorsToshio Kamatani, Hirohisa Ishiguro, Kensei Itakura, Kazuo Yamagishi
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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.
Claims10
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.
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.
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.
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.
Dependencies are inferred from the claim text.