Porcelain stoneware production process and products

A process for the production of porcelain stoneware products having an average thickness greater than or equal to 4.5 cm, starting from a mixture comprising a plurality of raw materials and a percentage between 1% and 40% of ashes residual from the combustion of urban waste, wherein a pre-treatment of said ashes is applied, the ashes pre-treatment comprising:

• a primary deferrization phase in which said ashes are subjected to the action of permanent magnets for the separation of ferrous fractions;
• a phase of separation of a fine fraction with a particle size between 0 mm and 8 mm and a coarse fraction with a particle size between 8 mm and 80 mm;
• a grinding step of said coarse fraction, with a granulometric reduction ratio between 1/6 and 1/8;
• a phase of demetallization through an induced current system, for the separation of aluminium fractions.
• wherein said mixture comprises one or more of the following raw materials:
• Percentage in
• Raw material
• the mixture
• 1
• Caolino BG (Minerali
• 12-15%
• Industriali):
• 2
• MF/TV (Svimisa)
• 12-15%
• 3
• Argilla Sigillo (Saxa Gres)
• 25-45%
• 4
• Sabbia Sasifo (Sibelco)
• 10-16%
• 5
• Sigillo (Plasticizer clay)
• 6-12%
• wherein the process comprises a step of grinding said ashes and/or said raw materials, such as to reduce them to a particle size of less than 150 μm.