Patent · US Expired

Process of calcining limestone in a rotary kiln

US4259081A · kind A · utility

13Cited by

4References

7Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Gerhard Reuter · Ismaning, DE
Wolfram Schnabel · Idstein, DE
Herbert Lausch · Frankfurt am Main, DE

Key dates

Filing date	Apr 20, 1978
Grant date	Mar 31, 1981
Priority date	—
Expiry date	Apr 20, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P40/40
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for the calcining of limestone or hydrated lime by thermal treatment thereof with hot gases in a rotary kiln through which the kiln atmosphere and the charge are countercurrently passed, which kiln is fed with solid carbonaceous fuel, is described. The invention resides in introducing an oxygen-containing gas into a horizontal region across the rotary kiln defined by a point along the length of the kiln where ignitable particles of said solid fuel first appear and a second point along the length of said rotary kiln which is spaced from the charging end of said kiln not more than 50% of the length thereof. The oxygen-containing gases are injected through nozzle blocks in said rotary kiln, and oxygen-containing gas is introduced into the free space of said kiln.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.