Abstract: Apparatus for treatment and making of construction materials and the like having a rotary kiln. Calcined material from the rotary kiln is reduced in size by driven rolls and delivered as free-flowing material at an upper end region to a vertical shaft kiln having peripheral walls inclined from the vertical no more than 3.degree. and diverging downwardly. A sidewall of the shaft kiln has perforations inclined downwardly for flow of hot gases into the shaft kiln in the general direction of flow of material downwardly in said shaft kiln. The treated material from the shaft kiln is discharged from a lower end region and transported therefrom by a grate system having heaters for heating the treated material thereon.

Abstract: A device for recovery of chlorine-containing compounds from waste gases having a chamber for passage of waste gases, including an inlet and outlet pipes and fans arranged in pairs inside the chamber along the gas flow, one opposite another, their blades being arranged parallel to the flow of waste gases through the chamber.

Abstract: A process for producing cement comprises grinding of a mixture of raw components containing calcium chloride. The resulting raw mixture is subjected to calcination at a temperature within the range of from 1,000 to 1,100.degree. C to produce a clinker which is then crushed at a temperature of from 900 to 1,100.degree. C. The crushed clinker is fractionated at a temperature of from 1,000 to 1,100.degree. C with a stream of the fuel combustion products at the speed thereof of from 6 to 30 m/sec. Two clinker fractions are thus obtained, namely: a fraction with a particle size of from 3 to 20 mm and a fraction with a particle size of from 0.1 to 3 mm. Each fraction is separately desalted at a temperature of from 900 to 1,100.degree. C by way of contacting with a stream of the heating agent comprising the fuel combustion products. The resulting desalted clinker fractions are cooled and ground.