Alumina-magnesia oxide, method of making the same, and fine pulverulent body of the same
AssigneeTaimei Kagaku Kogyo Kabushiki Kaisha
InventorsTokio Kamiyanagi, Takayuki Fujita, Noriho Harumiya
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Abstract
An object of the present invention is to provide an alumina-magnesia oxide which can be fine pulverulent bodies by pulverizing. In the alumina-magnesia oxide of the present invention includes: 70-73 WT % of alumina component, which is converted into alumina (Al.sub.2 O.sub.3); and 27-30 WT % of magnesia component, which is converted into magnesia (MgO). The alumina-magnesia oxide is formed into a pulverulent body, which is a hollow grain having loosed bulk density of 0.15 g/cm.sup.3 or less and average grain diameter of 10 .mu.m or more.
Claims8
An alumina-magnesia oxide, being made from a basic aqueous solution including an aluminum salt comprising poly aluminum chloride and a magnesium salt comprising magnesium chloride wherein said basic aqueous solution satisfies the following molar ratio formulas:
- Mg/Al=0.46-0.55;
- and
- Cl/Al=1.3-3.7,
- in which the total concentration of the aluminum salt and the magnesium salt, which are converted into oxides, is 12-20 WT %, said alumina-magnesia oxide, including:
- 7- 73WT % of an alumina component, which is converted into a alumina (Al.sub.2 O.sub.3);
- and
- 27-30 WT % of a magnesia component, which is converted into magnesia (MgO),
- wherein said alumina-magnesia oxide is formed into a pulverulent body, which is a hollow grain having a loose bulk density of 0.15 g/cm.sup.3 or less and an average grain diameter of 10 .mu.m or more.
A method of making alumina-magnesia oxide, comprising of the steps of:
- spraying an aqueous solution of an aluminum salt and a magnesia salt in an oxidizing atmosphere;
- and
- roasting said sprayed aqueous solution so as to form an alumina-magnesia oxide mainly having a spinel crystal form,
- wherein said aqueous solution is a basic aqueous solution including an aluminum salt and magnesium salt in which total concentration of the aluminum salt and magnesium salt, which are converted into oxides, is 12-20 WT %, and
- wherein said alumina-magnesia oxide is formed into a pulverulent body, which is a hollow grain.
A fine alumina-magnesia oxide pulverulent body being made from a basic aqueous solution including an aluminum salt and a magnesium salt in which the total concentration of the aluminum salt and the magnesium salt, which are converted into oxides, is 12-20 WT %, said fine alumina-magnesia oxide pulverulent body, including:
- 70-73 WT % of an alumina component, which is converted into alumina (Al.sub.2 O.sub.3);
- and
- 27-30 WT % of an magnesia component, which is converted into magnesia (MgO),
- wherein said fine pulverulent body is formed by pulverizing a hollow alumina-magnesia oxide grain including said alumina component and said magnesia component, and
- wherein the diameter of said fine pulverulent body is 1 .mu.m or less.
Dependencies are inferred from the claim text.