One hundred tons of waste lime mud are re-calcined daily in this 22' 3" diameter hearth furnace.

Calcinating

BSP Multiple Hearth Furnaces are the lowest cost method for re-calcinating lime. Systems now operating in waste water treatment plants and sugar refineries range in capacity from 3,000 lbs/day to 150 tons/day. Annual cost is as low as $20/ton, depending on amortization, interest rate, fee and operating schedule.

BSP furnaces have been installed in filtered and air-dried lime mud applications. Tests on limestone spalls also indicate a high quality lime can be produced..

The flexibility built into all BSP systems easily compensates for normal fluctuation in feed organics, moisture or CaO content.

Roasting

BSP furnaces are used in many metallurgical processes ranging from oxidation of sulfide concentrates to direct reduction for metallizing purposes. The furnace has also been used for heat shrinking, densification and many other processes.

The most common metallurgical application of the BSP unit has been the control of sulfur content and copper and molybdenum concentrates. It has also been used to improve leachability of metallic carbonate ores. Among the new applications under investigation are the roasting of stack fines, bag-house dust, precipitator dust and ore tailings for reclamation of valuable metals.

In recovery operations, materials can be heated by direct flame within tenths of degrees of fusion temperature with complete control. For example, cast iron chips from engine block machining can be de-oiled in a BSP furnace without chip fusion. Chips are directly briquetted for recycling.