Effects of particle size and ferric hydroxo complex ...
The grinding tests were performed in a laboratory vertical mill (JM-2, Changsha, Hunan Province, China) at a stirring speed of 600 rpm. The mill barrel was made of corundum with a volume of 200 mL, and the top of the stirring rod was covered with a nylon material, which was done to avoid the introduction of excess iron ions, except for the grinding media, which affected the experiments.