Experimental Study on the Treatment of Zinc-Containing Rotary Hearth Furnace Dust

In this chapter, the treatment process of the rotary hearth furnace (RHF) dust containing Zn, K and Na was studied by experimental method, including the processes of water leaching and addition of NaOH to the filtrate produced by the water leaching process. Water leaching experiment showed that almost all K and Na contents entered the filtrate, while the Zn content in the filtrate was reduced by 7%, and the Cl was reduced by 16%. The experimental of NaOH addition to the filtrate showed that the Zn form of the precipitate was ZnO and Zn-5(OH)(8)Cl-2 when the pH of the solution was 7.5-13. And when the amount of NaOH is increased from 1 time to 1.5 times of the theoretical consumption, the precipitation rate of Zn is increased from 80.31 to 89.54%, and when the amount of NaOH is increased from 1.5 times to 2 times, the precipitation rate of Zn is 89.54%.