Production of periclase refractory utilizing alkyd resins
AssigneeGeneral Refractories Company
InventorWate Thewis Bakker
Life of this patent
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Abstract
Improved periclase refractories are prepared by using an alkyd resin binder for tempering and pressing periclase grains into refractory shapes such as bricks. The pressed shapes are dried and fired. After firing, the refractory shapes are impregnated under vacuum with molten pitch and can then be used as lining in basic oxygen steelmaking furnaces. The fired refractory bricks have a greatly improved modulus of rupture at 1482.degree.C. of 3000-4000 p.s.i. The alkyd resin is generally incorporated in amounts of 2.5 to 4.5 weight percent. The green strength of the alkyd resin bonded bricks can be improved by adding a strong organic acid to the alkyd resin prior to mixing it with periclase grains. The green strength of bricks produced from such a mixture is between 30 and 40 p.s.i.
Claims14
A process for improved fired periclase refractories comprising mixing refractory periclase grain with 2.5 to 4.5% of alkyd resin, based on the weight of the grain, to form a refractory batch capable of being pressed into refractory shapes, pressing the batch into green refractory shapes aat a pressure of from 8,000 to 20,000 p.s.i., drying the green shapes at a temperature of from 100.degree. to 288.degree.C, and firing the dried shapes at a firing temperature of from 1538.degree. to 1760.degree.C.
A process for producing improved periclase refractories suitable for use in basic oxygen steelmaking furnaces, the process comprising grinding, crushing and sizing periclase grains to obtain a dense packing mixture;
- mixing the sized refractory grain mixture with 2.5 - 4.5% alkyd resin, based on the weight of the grain, to form a batch;
- blending the batch for 5 to 15 minutes in a mixer;
- pressing the blended batch into green refractory shapes at 8,000 to 20,000 p.s.i.;
- drying the green shapes at 100.degree. to 288.degree.C;
- and firing the dried shapes at 1538.degree. to 1760.degree.C.
Dependencies are inferred from the claim text.