In order to make better use of zinc-containing dust in steel plants, effects such as digestion time, material moisture content, mass ratio of OG-LT mixed dust and digestion method on the degree of f-CaO digestion in EAF and converter-LT dusts in iron and steel plants are studied combined with the production process of on-site rotary hearth furnace. The results show that: prolonging digestion time and increasing moisture content are beneficial to improve the slaking rate of EAF and converter-LT dusts, but f-CaO cannot be completely digested. On the premise of ensuring the material fluidity and smooth operation of production, when the moisture content is 15%, it needs to be digested for at least 48 hours, and the slaking rate of f-CaO in EAF and converter-LT dusts can reach above 80%. When the mass ratio of OG mud to LT dust exceeds 2: 1, the slaking rate of f-CaO in OG-LT mixed dust reaches over 70%. The production site can solve the adverse effects of the digestion reaction of f-CaO on the production by placing it with water on the floor and increasing the proportion of OG mud in the mixed dust. In addition, such processes as water immersion and mechanical activation are also important measures to improve the f-CaO slaking rate of zinc-containing dust.