Device for producing supplementary cementitious material

A device for heat-treating solid material in granular form, wherein the device comprises a kiln and an external heat generator wherein said kiln comprises at least one sloped sliding surface on which a bed of said solid material slides down within said kiln due to gravity while a hot gas generated by the external heat generator is led through said solid material to heat said solid material to a desired temperature in order to change the substance properties of said solid material, wherein said external heat generator for generating said hot gas is external to said kiln, wherein said kiln further comprises at least one kiln gas inlet through which said hot gas enters said kiln such that the necessary temperature of said hot gas can be controlled precisely in that said hot gas is generated in said external heat generator, ensuring that the solid material does not experience temperatures above an allowed maximum temperature, and further such that the solid material is not exposed to radiation from a burner, wherein said device further comprises a preheater for preheating said solid material before it enters the kiln and a cooler for cooling said heat-treated solid material exiting said kiln, wherein the cooler, the kiln and the preheater are arranged in vertical alignment one above the other, respectively, wherein the device further comprises at least one bypass for guiding cooling gas used for cooling the heat-treated solid material in the cooler, after having been heated by the heat-treated solid material, to the preheater.

A device for heat-treating solid material in granular form, wherein the device comprises a kiln and an external heat generator wherein said kiln comprises at least one sloped sliding surface on which a bed of said solid material slides down within said kiln due to gravity while a hot gas generated by the external heat generator is led through said solid material to heat said solid material to a desired temperature in order to change the substance properties of said solid material, wherein said external heat generator for generating said hot gas is external to said kiln, wherein said kiln further comprises at least one kiln gas inlet through which said hot gas enters said kiln such that the necessary temperature of said hot gas can be controlled precisely in that said hot gas is generated in said external heat generator, ensuring that the solid material does not experience temperatures above an allowed maximum temperature, and further such that the solid material is not exposed to radiation from a burner, wherein said device further comprises a preheater for preheating said solid material before it enters the kiln and a cooler for cooling said heat-treated solid material exiting said kiln, wherein the cooler, the kiln and the preheater are arranged in vertical alignment one above the other, respectively, wherein the preheater comprises several preheating sections in which preheating of the solid material occurs in several preheating steps, wherein the cooler comprises several cooling sections in which cooling of the solid material occurs in several cooling steps, and wherein the device is adapted and configured such that gas can be extracted or added in at least one or in all of said preheating and cooling steps.