Views: 201 Author: SEPPE Publish Time: 2023-06-12 Origin: related online excerpts
Bauxite is the primary source of metallurgical-grade alumina, used to make aluminium metal, and non-metallurgical alumina, used in a range of industrial applications.
About 80-85% of bauxite mined is processed via the Bayer Process to make alumina trihydrate (ATH), then smelter grade alumina (SGA), from which aluminium metal is derived.The remaining 10-15% of crude bauxite is used to produce a range of non-metallurgical bauxite grades and non-metallurgical alumina grades.
The main applications for non-metallurgical bauxites are refractories, abrasives, high aluminium cements, aluminium chemicals and activated bauxite and alumina.Other uses include filters and pigments for plastics and elastomers; special calcined aluminas for ceramics, refractories, abrasives, soft-burned calcined aluminas, hard-burned calcined aluminas for alumina cements, calcium-aluminate cements and mineral wool.
There are three main grades of non-metallurgical bauxite.
Abrasive-grade bauxite, used to produce abrasives;
Chemical-grade bauxite, used to produce aluminium chemicals;
Refractory-grade bauxite, used to produce high alumina refractories.