The test production aspect of 200Mt/a grate-kiln oxidized pellet production line in Hangang,and the process characteristics and chief equipments were presented.

Basic features,reasonable heat treatment regime and matching of air system for grate-kiln oxidized pellet technology are discussed.

0 Mt grate-kiln oxidized pellet process in Hangang and how to solve the problems met in trial are introduced.

4 Mt/a grate rotary-kiln production line in Shagang Iron & Steel Groups Corporation,there were a series of problems in operation.

Electrostatic precipitator(ESP)used for purifying flue gas from grate rotary-kiln of Dagushan Pellet Plant is introduced.

The test production aspect of 200Mt/a grate-kiln oxidized pellet production line in HANGANG, and the process characteristics and chief equipments were presented in this paper.

Aimed at the problems that refractory material in grate-rotary kiln and pellet cooler were marred,the reasons causing the refractory mar were analyzeds and the methods and measures to lengthen the lifetime of refractory material in grate-rotary kiln was proposed.

In grate-rotary kiln\'s tests,after preheated at 900 ℃ for 6 min and fired at 1220 ℃ for 10 min,the pellets can take good physical strength and good chemical composition.

By analyzing three pelletizing processes and present situation of pellets industry, proper roasting technics-grate kiln should be popularized.