Research on reduction impurities in the iron ore by chloridification roasting

Abstract

High impurity levels significantly impact iron ore smelting. In order to reduce impurities to meet the requirements for raw materials in blast furnace iron production, this study investigates the efficiency of impurity reduction using chloridification roasting. Several laboratory experiments were conducted to analyze the effects of reducing agent dosage on impurity reduction from iron ores. The study determined an optimal roasting temperature of approximately 1250°C, with oxygen as the roasting medium. The recommended reducing agent dosage was approximately 9%. Specifically, the reduction efficiencies for sulfur (S), lead (Pb), zinc (Zn), copper (Cu), and arsenic (As) were found to be 56.42%, 99.68%, 69.78%, 38.46%, and 23.91%, respectively. Additionally, the ore pellets exhibited good crystallization, a dense mineral structure, and a compressive strength of 2054.5 N per ore pellet.