Method for producing potassium-calcium fertilizer by using potassium feldspar, limestone and phosphogypsum

The invention relates to a method for producing potassium-calcium fertilizer by using potassium feldspar, limestone and phosphogypsum, and belongs to the technical fields of three-waste treatment and chemical engineering technical field. The method comprises that: the feldspar, the limestone and the phosphogypsum are mixed in certain proportion, subjected to grinding, ball forming or block forming and then baked in a rotary kiln, vertical kiln or tunnel kiln, and the sintered grog is crushed and packaged into products of the potassium-calcium fertilizer. One of main raw materials for producing the potassium-calcium fertilizer is industrial waste residue phosphogypsum, and the method has more advantages than the prior methods for producing the potassium-calcium fertilizer.