Device and method for the thermal treatment of a mineral feedstock

An apparatus for thermal treatment of a mineral starting material, comprising:

• a calciner, including at least a first calciner section, a second calciner section, and a third calciner section;
• wherein the first calciner section is arranged vertically;
• wherein the second calciner section is arranged at an incline;
• wherein the third calciner section is arranged vertically;
• wherein the second calciner section has an angle α between the horizontal and a flow direction of the second calciner section;
• wherein the angle α is between 20° and 80°;
• wherein the first calciner section includes a first hydraulic diameter dh,1;
• wherein the second calciner section includes a second hydraulic diameter dh,2;
• wherein the second hydraulic diameter dh,2 is less than or equal to the first hydraulic diameter dh,1 multiplied by the sine of the angle α;
• wherein the first calciner section and the second calciner section are configured to have a gas stream flow through them from bottom to top;
• wherein the first calciner is arranged below the second calciner section;
• wherein the third calciner section is arranged above the second calciner section;
• wherein a fuel feed for a solid fuel is arranged at an upper end of the second calciner section;
• wherein the lower side of the second calciner section is stepped;
• wherein the second calciner section includes a first starting material feed arranged in the lower 20% of the second calciner section;
• wherein the first starting material feed supplies starting material into the gas stream of the second calciner section from above or from the side.