Preparation of pre-reduced pellet using pyrite cinder containing nonferrous metals with high temperature chloridizingreduction roasting technology—Effect of CaCl₂ additive

Abstract

The role of CaCl₂ during the high temperature chloridizing-reduction roasting process was investigated, aiming at acquiring high strength blast furnace burden with high iron grade and low nonferrous metals content. The effects of CaCl₂ dosage on pelletizing, preheating and reduction were investigated. The results show that CaCl₂ can improve the wet drop strength but reduces the thermostability of pyrite cinder green balls. When the dosage of CaCl₂ exceeds 1%, the compressive strength of preheated pellets decreases while the growth of iron oxide particles is improved. Furthermore, the compressive strength of pre-reduced pellets increases but the metallization degree of pre-reduced pellets decreases with CaCl₂ additive. The removal tests indicate that Zn can be removed completely without CaCl₂ additive, Cu is removed only under the condition with CaCl₂ additive and part of Pb must be removed by CaCl₂ additive.

Keywords

pyrite cinder / CaCl₂ additive / pelletizing / chloridising / reduction

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