Abstract: A turntable furnace for heating particulate material and which is particularly suited for the industrial production of litharge. The particulate material is heated inside the furnace on a turntable hearth and distributed radially outwardly from the center of the hearth to a discharge opening by a pair of water cooled screw augers. The rotational speed of the turntable hearth and the screw augers may be independently controlled to vary the amount of mixing and blending of the particulate material and to vary the length of time the particulate material is subjected to heat.

Abstract: A stationary horizontal cylindrical reactor for the production of lead oxide comprises a series of horizontal rotating blades to promote and maintain the oxidation reaction, to provide a particle size reduction and to effect centrifugal classification of the lead oxide produced in the reaction. The reactor includes a chamber supplied with raw lead, air and water, and by the use of the entire reactor chamber-blade interface as a reaction zone results in a highly energy efficient and high rate production apparatus. The apparatus is extremely versatile and can be used to produce low free lead (less than 1%) litharge (PbO) and high free lead or leady litharge on a consistent high volume basis.

Abstract: A stationary horizontal cylindrical reactor for the production of lead oxide utilizes a series of horizontal rotating blades to promote and maintain the oxidation reaction, to provide a particle size reduction and to effect centrifugal classification of the lead oxide produced in the reaction. The preheated reactor chamber is supplied with raw lead, air and water, and the use of the entire reactor chamber-blade interface as a reaction zone results in a highly energy efficient and high rate production process. The process is extremely versatile and can be used to produce low free lead (less than 1%) litharge (PbO) and high free lead or leady litharge on a consistent high volume basis.