The iron-containing electric-furnace steelmaking waste: physical and chemical properties and acidic modification

Svetlana Sverguzova,Zhanna Sapronova,Anastasia Svyatchenko,Ildar Shaihiev,S Bratan

doi:10.1051/e3sconf/201912600076

Abstract

The electric furnace steelmaking dust is formed at melting metalized pellets in electric-arc steel-making furnaces and is a largetonnage waste. It contains such elements as Fe, Mg, Al, C, Si, Zn, Mn, Na. The ferrous and ferric iron compounds in the EFS dust are mostly presented with oxides — the compounds, which are poorly soluble in aqueous media and can’t take part in exchange reactions under ordinary conditions. The acid treatment with HCl allows obtaining a coagulating suspension, which can be usedfor wastewater treatment. Besides, there was detected up to 14 % of CaO, both free and in calcium silicates such as CaSiO3 and Ca2SiO4. So, in the process of treatment with EFS dust the formation of polysilicic acids helps increasing the purification efficiency.

Highlights

IntroductionOver 30% (by some estimates – up to 50%) of the annual global amount of steel is produced by means of electric-furnace steelmaking [1,2,3,4]
Over 30% of the annual global amount of steel is produced by means of electric-furnace steelmaking [1,2,3,4]
According to the X-ray phase analysis data, the ferrous and ferric iron compounds in the electric furnace steelmaking (EFS) dust are mostly presented with oxides – compounds, which are poorly soluble in water media and can’t take part in exchange reactions under ordinary conditions

Summary

Introduction

Over 30% (by some estimates – up to 50%) of the annual global amount of steel is produced by means of electric-furnace steelmaking [1,2,3,4]. The steel melting processes take place at high temperatures – RYHU ɋ which is accompanied by intensive dust and gas separation [4]. The electric furnace steelmaking (EFS) dust is formed at melting metalized pellets in electric-arc steel-making furnaces in amount of 25 kg per ton of steel and is concentrated in filters in the course of gas purification [8]. The dust is recycled by sintering of a composite [15]; it can be recirculated together with rolling scale to the electric-arc furnace [16]

Methods

Results

Conclusion