1. AN APPARATUS FOR PRODUCING BUILDING MATERIALS COMPRISING CONTAINER MEANS OF SUBSTANTIALLY CIRCULAR CROSS SECTION FOR HOLDING A LIQUID SLAG BATH IN A SUBSTANTIALLY CIRCULAR CROSS SECTIONAL AREA WITH A SUBSTANTIALLY CIRCULAR SLAG BATH SURFACE CIRCUMFERENCE, RAW MATERIALS DISCHARGE MEANS FOR DISCHARGING SOLID RAW MATERIALS INTO THE LIQUID SLAG BATH TANGENTIALLY TO AT LEAST ONE FIRST IMAGINARY CIRCLE ASSUMED AT THE SLAG BATH SURFACE AND CONCENTRIC TO THE SLAG BATH SURFACE CIRCUMFERENCE, FUELS AND COMBUSTION AGENTS DISCHARGE MEANS FOR DISCHARGING FUELS AND COMBUSTION AGENTS INTO THE SLAG BATH TANGENTIALLY TO AT LEAST ONE SECOND IMAGINARY CIRCLE ASSUMED AT THE SLAG BATH SURFACE, SAID SECOND IMAGINARY CIRCLE HAVING A DIFFERENT RADIUS FROM THE FIRST IMAGINARY CIRCLE, AND OVERFLOW MEANS SPACED AT LEAST 200 MILLIMETERS ABOVE THE BOTTOM OF THE CONTAINER MEANS FOR WITHDRAWING THE LIQUID SLAG BATH.