Why recycling ceramic doesn't exist?

Because it's inefficient. Re-use would be possible. Re-use as a neutral filling material is also an option. Recycling in the sense that you make new ceramic parts out of them would be very difficult and energy intensive. Much easier, cheaper and - in the final run - environmentally friendly just to make new stuff. After all, the raw material also is basically a neutral filling material. So in a sense, by using the shredded ceramics e.g. as foundation material, you do recycle them - just on a geological, not a human timescale.