Ube Chemical Industries, Co., Ltd.

Ube Chemical Industries, Ltd.

Akira Kaneyasu

Kosei Yamamoto

Toshiichi Iwamoto

Yo Arita

A lightweight magnesia clinker containing magnesium oxide in an amount of more than 85 wt. % and having an apparent porosity of more than 40 vol. % and a bulk specific gravity of less than 2.0 g/cm.sup.3 is disclosed. In the lightweight magnesia clinker, the amount of magnesia clinker particles having a particle diameter of smaller than 3 mm is more than 90 wt. % of the amount of all magnesia clinker particles, and the amount of pores formed in the magnesia clicker particles having a pore size of smaller than 50 .mu.m is more than 90 vol. % of the amount of all pores. A process for the preparation of said lightweight magnesia clinker is also disclosed.

Lightweight magnesia clinker and process for the preparation of the same

A magnesia-calcia clinker having a high density, said clinker containing MgO, CaO and Fe.sub.2 O.sub.3 as oxides, having the following chemical composition in percent by weight

High-density magnesia-calcia clinker and process for production thereof

High density magnesia clinker characterized by having a chemical composition, as oxides in weight %, of

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Ube, Japan

Akira Kaneyasu