Pre-crushing process of ceramic hard raw materials

The invention provides a pre-crushing process of ceramic hard raw materials. The process comprises the following steps that 1, coarse crushing is carried out on the materials, and discharging particlesize is not larger than 80 mm; 2, the materials coarsely crushed in the first step are subjected to intermediate crushing, the discharging particle size in the step is not larger than 25 mm, and thetotal amount of the materials with the particle size not larger than 25 mm is not smaller than 45% of the total amount of the materials subjected to intermediate crushing; 3, the materials subjected to intermediate crushing in the second step are subjected to first-stage screening, and the discharging particle size in the step is not larger than 25mm; 4, the materials subjected to first-stage screening in the third step are finely crushed, the discharging particle size in the step is less than 10mm, and the total amount of the materials with the particle size less than 10mm is not less than 60% of the total amount of t