My first mod, made mostly vanilla friendly. It adds three new blocks:
(None of theese use up any fuel)
Grinder :
Grinds cobblestone into gravel and gravel into sand.
(Also grinds netherrack with a chance to get netherite scrap)
Washer:
Turns gravel into IronDust and flint;
Turns sand into GoldenDust and DiamondDust.
Burner:
Makes nuggets out of dust.
Recipes:
Grinder

Washer

Burner

Feel free to leave a comment if you find any bugs :)
(Recommended to use with Simple conveyor belts and Block Breaker & Block Placer mods)