Method of utilizing artificially synthesized microporous spinel to prepare magnesium aluminate spinel firebrick with low thermal conductivity

• Main Authors: HEINRICH LIEVER, ZHONGTING MA, JINGHUI QIAN, TOM AXMANN
• Format: Patent
• Language: Chinese; English
• Published: 14.07.2017
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention discloses a method of utilizing artificially synthesized microporous spinel to prepare a magnesium aluminate spinel firebrick with low thermal conductivity, and belongs to the technical field of refractory materials. The method is characterized by comprising the following steps: grinding a main raw material composed of industrial alumina and caustic calcined magnesite, water, and a foaming agent to obtain slurry; draining the slurry, extruding the slurry in vacuum, drying and sintering the slurry to obtain microporous spinel; dry-mixing dead burnt magnesite and microporous spinel according to a certain mass ratio, then adding water and a bonding agent to carry out wet-mixing; punching the mixture by a press machine to form a semi-finished brick blank, drying the brick blank in a drying kiln, and finally burning the brick blank in a tunnel kiln. Microporous spinel and dead burnt magnesite are mixed, moulded by a press machine, and finally burned to form a novel magnesium aluminate spinel firebric