... refractory, bauxite clinker, carborundum, raw glass, machinery-made construction sand, stone and other metallurgical slag. It has higher ... refractory, bauxite clinker, carborundum, raw glass, machinery-made construction sand, stone and other metallurgical slag. It has ... refractory, bauxite clinker, carborundum, raw glass, machinery-made construction sand, stone and other metallurgical slag. It has ...