KR910011693A - High purity, coarse crystal sintered magnesia clinker and its manufacturing method - Google Patents

Abstract

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Description

High purity, coarse crystal sintered magnesia clinker and its manufacturing method

As this is a public information case, the full text was not included.

1 is an X-ray diffraction diagram of a powder which is an example of the magnesia clinker of the present invention.

Claims (10)

Perry's clay and containing a Cr ₂ O ₃ employed in the crystal, 0.4 to 6.5% by weight, a content of Cr ₂ O _3, Perry clay average crystal grain diameter is more than 60㎛ contribution, and the particle diameter of the clay's 150㎛ Perry's of Sintered magnesia clinker, wherein the number of particles of the crystal occupies at least 10% of the total number of particles of the crystal. The method of claim 1, wherein the sintered magnesia clinker is expressed in weight percent of oxide, Cr ₂ O ₃ 0.40 to 6.5% 1.0% or less of components other than MgO and Cr ₂ O ₃ Sintered magnesia clinker with a chemical composition of. The method according to claim 1 or 2, wherein the sintered magnesia clinker is expressed in weight percent of an oxide, MgO 93.0% or more CaO 0.50% or less B ₂ O ₃ 0.10% or less Cr ₂ O ₃ 0.40 to 6.5% Sintered magnesia clinker having a chemical composition of at least 3.40 g / cm 2 and having a bulk density. 4. The sintered magnesia clinker according to any one of claims 1 to 3, wherein the number of particles of the pericles crystal having a particle size of 150 mu m or more occupies at least 12% of the total number of particles of the crystal. The method of claim 1, wherein the sintered magnesia clinker is represented by weight percent of oxide, MgO 93.1% or more CaO 0.30% or less B ₂ O ₃ 0.05% or less Cr ₂ O ₃ 0.40 to 6.5% Have a chemical composition of and have a bulk density of at least 3.45 g / cm 2 and have an average crystal grain size of pericles of at least 80 μm, and the number of particles of pericle crystals having a particle diameter of at least 150 μm, at least of the total number of particles of this crystal. Sintered magnesia clinker occupies 20%. The particle size according to any one of claims 1 to 5, having a bulk density of at least 3.48 g / cm 2 and an average crystal grain size of the pericles of 100 µm or more, and the number of particles of the pelletized crystals having a particle diameter of 150 µm or more. Sintered magnesia clinker, which occupies at least 27% of the total particle number of the crystals. The sintered magnesia clinker according to any one of claims 1 to 6, wherein a large part of Cr ₂ O ₃ to be contained is dissolved in the perclade crystal. As a criterion for breaking, the composition of the following weight basis: MgO 99.0% or more CaO 0.50% or less B ₂ O ₃ 0.15% or less A method for producing the sintered magnesia clinker according to any one of claims 1 to 7, characterized in that the chromium compound is mixed with magnesium hydroxide or magnesium oxide having a compound, pressure molding the obtained mixture, and then firing. The method according to claim 8, wherein magnesium hydroxide or magnesium oxide is a force reference value, and the composition based on the following weight basis: MgO 99.4% or more CaO 0.30% or less B ₂ O ₃ 0.05% or less Characterized by having a. The method according to claim 8, wherein magnesium oxide obtained by adding an alkali raw material such as lime oil to seawater is used. ※ Note: The disclosure is based on the initial application.