acid leaching stage的用法和样例：
- The acid leaching kinetics of serpentine was researched.
- The reaction rate was dually controlled by chemical reaction and diffusion in the initial stage of pressure acid leaching, but was mainly by chemical reaction in the latter stage.
- The effect of pre-treatment of the asbestos tailings on the acid leaching reaction of asbestos tailings was studied.
- By chemical dispersion and acid leaching,silica nanowires were prepared from natural mineral chrysotile.