The possibility evaluation of zinc sulphate forms extraction from sludge of PJSC EVRAZ NTMK with following metalloflux obtaining

O Yu Sheshukov,I V Nekrasov,D K Egiazaryan,M A Mikheenkov

doi:10.1088/1757-899x/966/1/012047

Abstract

EVRAZ NTMK JSC has significant amount of blast furnace sludges, that accumulated in dumps. Chemical and phase analysis of that sludges was carried out. It has shown significant amount of zinc sulphate, which prevents such sludge utilization in a blast furnace. Moreover, zinc sulphate requires a high temperature unit for recycling by common schemes. The possibility of zinc sulphate conversation into oxidized zinc with simultaneous metallized residue obtaining under the common for Waelz process temperatures was confirmed in laboratory. The obtained during laboratory experiments metallized residue is suitable for using in blast furnace as charge addition. The results of a thermodynamic analysis of the zinc sulphate conversion to oxide and the physicochemical basis for the extraction of such zinc forms are presented. Theoretical calculations and laboratory experiments confirmed that sludges with zinc sulphate could be suitable materials for blast furnace. But, sludges of different processes allow to obtain fired briquettes with different physical properties.

Highlights

A significant amount of sludge from the blast furnace shop has been accumulated on the EVRAZ NTMK JSC
This processing method is not possible, due to zinc containing in these sludges, which leads to the formation of zinc crust in the upper part of the blast furnace
Materials and experimental method To assess the possibility of removing zinc from the sludge of EVRAZ NTMK JSC, the company provided two samples of sludge: from the blast furnace shop and from the open-hearth furnace dust aspiration system

Summary

Introduction

1. Introduction A significant amount of sludge from the blast furnace shop has been accumulated on the EVRAZ NTMK JSC. The easiest way to process these sludges is to mix them to raw materials of blast furnace. This processing method is not possible, due to zinc containing in these sludges, which leads to the formation of zinc crust in the upper part of the blast furnace. Zinc crust complicate the flow of the blast furnace process and their removal is possible only with overhaul of the blast furnace.

Results

Conclusion