Abstract: A resin bonded refractory composition of increased pressability and consequently increased density and strength is made by adding potassium borate to prior art refractory compositions.
Type:
Grant
Filed:
October 30, 1989
Date of Patent:
March 26, 1991
Assignee:
National Refractories & Minerals Corporation
Abstract: Gunning apparatus adapted to be carried by a mobile device such as a fork lift truck and inserted in a side door of a furnace such as an electric furnace and used to gun refractory material onto the inside surface of the furnace lining comprises a boom with one end adapted to be attached to the mobile device and the other end carrying a spray nozzle which can be rotated about a vertical axis, the boom also carrying channels to convey, separately, refractory and water to a mixer where the refractory and water are admixed, a channel to carry the admixture to the spray nozzle, and a motor to rotate the spray nozzle.
Type:
Grant
Filed:
May 7, 1987
Date of Patent:
October 25, 1988
Assignee:
National Refractories & Minerals Corporation
Abstract: An improved refractory composition especially adapted for use as a gunning mix is made of aggregate (for example, periclase) and a bonding material (for example, aluminum sulfate, boric acid, and citric acid) to which is added attapulgite. The composition may also contain other materials, as is known in the art.
Type:
Grant
Filed:
October 14, 1986
Date of Patent:
October 18, 1988
Assignee:
National Refractories & Minerals Corporation
Abstract: A ladle or other vessel for containing molten metal, for example molten steel, is lined with refractory at least some of which (e.g. in the slag line area) is unfired refractory bonded with a phosphate bond such as a long-chain glassy polyphosphate and containing, at least in the material smaller than 0.15 mm (-100 mesh), a high-lime periclase grain. This type of refractory shows unexpectedly high resistance to erosion and corrosion in the environment of a steelmaking ladle.
Type:
Grant
Filed:
November 29, 1984
Date of Patent:
February 18, 1986
Assignee:
National Refractories & Minerals Corporation