Shale brick firing process

The invention discloses a shale brick firing process in the field of shale bricks. The shale brick firing process comprises the following steps: S1, burdening: preparing coal gangue and shale according to a ratio of 1: 2, 3: 2 or 5: 3; S2, crushing and sieving: crushing the coal gangue and the shale by using a jaw crusher to obtain fragments with the particle size of less than 3 mm, crushing by using a fine crusher, and sieving by using meshes with different grades of less than 0.05 mm, 0.05-1.2 mm and 1.2-2 mm respectively according to the proportion of 35-50% of plastic particles, 20-65% offilling particles and less than 30% of coarse particles until the particles pass through the meshes; and S3, stirring and settling: adding water into the sieved powder, putting the obtained mixture into a stirrer, uniformly stirring, putting the stirred mixture into a storage room after stirring is completed, and settling for 72 hours. Purple grey silty shale sandwiched thin-layer sandstone is used as a substitute resourc