Refractory material
AssigneeVesuvius Crucible Company
InventorIan Strawbridge
Life of this patent
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Abstract
The invention relates to refractory waste materials and in particular to waste materials removed from furnace linings. Refractory waste materials often have hydrolysable contaminants making the material unsuitable for use in making new products. The invention provides an economical treatment process that renders such materials suitable for reuse. The process includes maintaining a particulate feedstock created from the waste material at a temperature in the range 275-500° C. and applying superheated steam to the material.
Claims10
A process for producing a stabilized refractory aggregate from material comprising graphite and at least one oxide selected from the group consisting of magnesia and alumina, the process comprising applying superheated steam to a particulate feedstock formed from the reclaimed material while maintaining the particulate feedstock at a temperature from 100-500° C. so that the oxide and graphite are substantially non-reactive and hydratable contaminants in the particulate feedstock are hydrated.
A process for producing a stabilized refractory aggregate from material containing magnesia-graphite reclaimed from a refractory lining after the lining's useful life comprising:
- placing a particulate feedstock formed from the reclaimed material in a vessel;
- and
- applying superheated steam to the particulate feedstock while maintaining the particulate feedstock at a temperature from 275-500° C. for a residence time sufficient so that magnesia and graphite are substantially non-reactive and hydratable contaminants in the particulate feedstock are hydrated.
Dependencies are inferred from the claim text.