A method of granulation by agglomeration of ceramic compositions ground in dry phase characterized in that it comprises the steps of: - Entering, at room temperature, a ceramic composition of powdery components in dry phase with grain sizes of less than 120 micrometers obtained from ground minerals or clay content or other compositions made up only of clays and inorganic material after dry-phase grinding, in a horizontally arranged rotary cylindrical device through the intake on the upper part of a first side end, the composition of powdery content being up to 60% of said mineral components, said device comprising a central shaft with perpendicular bars provided with paddles at the ends thereof, - Said powdery components having a moisture content when introduced in the cylindrical device between 0.5% and 2.5% by weight, - Spraying a specific amount of water in the upper part of the first side end of the device, between 11% and 13% by weight of the dry mass to be granulated, without binders or additives, in the cylindrical device, depending on the entered ceramic composition and on the granulation to be obtained, - Continuously granulating said ceramic composition of powdery components inside the cylindrical device, between 40°C and 80°C, by means of moving said components for the formation of granules from said first end to a second side end moving the granules along the entire length of the device due to the rotation action of the device, with said bars and paddles, at a rotational speed between 500 and 3000 rpm, keeping the rotational speed and the amount of water constant when granulating the ceramic composition of powdery components, the rotational speed depending on the introduced ceramic composition and on the granulation to be obtained; - Extracting the granulated material from the cylindrical device through the outlet in the lower part of said second end, being the moisture content of said material between 10 and 14% by weight depending on the ceramic composition introduced in the cylindrical device and the temperature is of the order of 40°-50°C, and - Reducing the moisture content of the granulated material extracted from the device to 6% by weight. - Entering, at room temperature, a ceramic composition of powdery components in dry phase with grain sizes of less than 120 micrometers obtained from ground minerals or clay content or other compositions made up only of clays and inorganic material after dry-phase grinding, in a horizontally arranged rotary cylindrical device through the intake on the upper part of a first side end, the composition of powdery content being up to 60% of said mineral components, said device comprising a central shaft with perpendicular bars provided with paddles at the ends thereof, - Said powdery components having a moisture content when introduced in the cylindrical device between 0.5% and 2.5% by weight, - Spraying a specific amount of water in the upper part of the first side end of the device, between 11% and 13% by weight of the dry mass to be granulated, without binders or additives, in the cylindrical device, depending on the entered ceramic composition and on the granulation to be obtained, - Continuously granulating said ceramic composition of powdery components inside the cylindrical device, between 40°C and 80°C, by means of moving said components for the formation of granules from said first end to a second side end moving the granules along the entire length of the device due to the rotation action of the device, with said bars and paddles, at a rotational speed between 500 and 3000 rpm, keeping the rotational speed and the amount of water constant when granulating the ceramic composition of powdery components, the rotational speed depending on the introduced ceramic composition and on the granulation to be obtained; - Extracting the granulated material from the cylindrical device through the outlet in the lower part of said second end, being the moisture content of said material between 10 and 14% by weight depending on the ceramic composition introduced in the cylindrical device and the temperature is of the order of 40°-50°C, and - Reducing the moisture content of the granulated material extracted from the device to 6% by weight.