US 4,396,422 A · Process for producing iron and refractory material

Abstract

There is disclosed a process for producing iron and refractory material for use as a raw material for a refractory brick and as an aggregate for a castable refractory product. A mixture of aluminum smelting residue and scale is introduced into a furnace. The mixture is melted in the furnace and a thermit reaction is generated. After the completion of the thermit reaction, a molten iron and a molten slag are cooled. Particularly the molten slag is gradually cooled. The slag is crushed to form the refractory material. Alternatively, in order to produce iron and alumina cement, quicklime and/or limestone are further introduced into the furnace. The molten slag is cooled rapidly to form a clinker. The clinker is crushed to a powder size to form the alumina cement.

Claims7

Dependent claims

A process for producing iron and a refractory material for use as a raw material for a refractory brick and as an aggregate for a castable refractory product, which process comprises the steps of:

(a) introducing a mixture of aluminum smelting residue and scale into a furnace, said aluminum smelting residue being composed mainly of metallic aluminum and alumina, and said scale being composed mainly of iron oxide;
(b) melting said mixture in the furnace and generating a thermit reaction between the metallic aluminum in said aluminum smelting residue and the iron oxide in said scale, so that said mixture is formed into molten iron and molten slag;
(c) cooling said molten iron and said molten slag after the completion of said thermit reaction, said molten slag being gradually cooled to cause crystal growth therein;
and
(d) crushing said slag to particle size or powder size to form the refractory material.

2 more elements

Dependencies are inferred from the claim text.

Process for producing iron and refractory material

Life of this patent

Process for producing iron and refractory material

Life of this patent

Abstract

Claims7