Heat treatment of lime sludge
US5711802A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1996 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Sep 17, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B7/2025
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method and plant for heat treatment of lime sludge (CaCO.sub.3) formed by the causticizing process during the manufacture of paper pulp. The lime sludge is dried and pulverized in a first process stage and preheated in a second process stage by means of hot exhaust gas coming from a kiln. In order to ensure that the temperature in the second process stage does not exceed a predetermined temperature lying within the range from 400.degree.-600.degree. C., the relationship between the amount of energy available in the exhaust gas for preheating in the second process stage and the amount of accumulated energy in the material which is to be preheated is regulated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.