Features of metallurgy waste mainly processing with account for raw material contrast

Alexander Burdonov,Konstantin Prokhorov,Vyacheslav Barakhtenko,Yuri Novikov,I Rasskazov,S Tkach

doi:10.1051/e3sconf/202019202026

Abstract

This work presents research studies of alumina-containing estimates formed during the production of aluminum on electrolyzers with self-burning anodes during technological operations at PJSC RUSAL Bratsk. Material from the territory of the electrolysis workshop, with a mark of ± 0, is a mixture of finely dispersed powder, 2.5 mm in size (on average 62.78% by weight) with pieces of material from 0.5 to 6 cm in size. , 26% by weight). As a result of the work, the particle size and chemical-metallurgical properties of an alumina-containing estimate were studied. During the research, the content of valuable components and impurities in the sample of various classes was determined. In the process of mineralogical analysis, two phases were identified in the products: dark, black-gray and light, grayish-white. It is proved that these phases have significant differences in the chemical composition of the feed. Spectroscopic studies showed significant differences in the colorimetric characteristics of the raw materials, which is a fundamental factor for the use of photometric separation. Based on preliminary studies on the separation of alumina-containing estimates by photometric separation, the fundamental possibility of purifying contaminated material from technological impurities has been established.

Highlights

The metallurgical industry makes a significant contribution to environmental pollution, in particular, the production of aluminum by electrolysis of cryolite-alumina melts [1-3]
Estimates are waste of complex variable composition, swept away in the electrolysis shops. An interest in their processing lies in the fact that they contain a significant amount of valuable components (Na3AlF6, Al2O3, AlF3), the extraction of which and reuse in the production of aluminum can help reduce the cost of production
The purpose of the research was to study the process of processing alumina-containing estimates of PJSC RUSAL Bratsk (Bratsk Aluminum Plant) for a possible return to the electrolysis process

Summary

Introduction

The metallurgical industry makes a significant contribution to environmental pollution, in particular, the production of aluminum by electrolysis of cryolite-alumina melts [1-3]. The main reason for the formation of a large amount of waste at Russian primary aluminum enterprises is the use of cryolite-alumina melt electrolysis technology with the installation of baths with a self-burning anode - with the Soderberg anode [7]. Estimates are waste of complex variable composition, swept away in the electrolysis shops An interest in their processing lies in the fact that they contain a significant amount of valuable components (Na3AlF6, Al2O3, AlF3), the extraction of which and reuse in the production of aluminum can help reduce the cost of production. The purpose of the research was to study the process of processing alumina-containing estimates of PJSC RUSAL Bratsk (Bratsk Aluminum Plant) for a possible return to the electrolysis process

Formulation of the problem

Research part

Findings