Process for producing high quality high purity magnesite by two-step calcining natural cryptocrystalline magnesite

The two-step calcining process of producing high quality high purity magnesite with natural cryptocrystalline magnesite includes the steps of: water washing cryptocrystalline magnesite, drying, crushing to 0-5 mm size, roasting in a boiling furnace, stepped milling, mixing the ground material with a...

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1. Verfasser:	QINGGUANG YANG
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE
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Zusammenfassung:	The two-step calcining process of producing high quality high purity magnesite with natural cryptocrystalline magnesite includes the steps of: water washing cryptocrystalline magnesite, drying, crushing to 0-5 mm size, roasting in a boiling furnace, stepped milling, mixing the ground material with anionic activating agent, pressing ball inside a dry ball pressing system, curing for 48 hr, and calcining in a high temperature vertical oil kiln at 1950-2050deg.c for 18-20 hr. The product has a MgO content of 98-99 %, bulk density of 3.40-3.45g/cu cm. Compared with sea water magnesite, the product has low production cost and high fire resisting strength.