Self-magnetization of weakly magnetic iron minerals

The surface self-magnetization of weakly magnetic iron minerals was realized by using the dissolution characteristic of siderite and hematite in an acidic condition,without adding any iron ions,only adjusting the pH value in the slurry and controlling the reaction temperature.The effects of reaction time,ferric ions concentration,H₂O₂ addition and reaction temperature on the dissolution behavior of siderite in an acidic condition were investigated in this experiment.The recovery rate of siderite increased from 53.8% to 94.6% at 100℃ by the self-magnetization.So it can be determined that reaction temperature is an important factor to affect the self-magnetization.Mixture minerals made of siderite and hematite were used to repeat the self-magnetization experiment of siderite,and their recovery rate increased from 66.8% to 72.6%.Finally,actual mixture minerals made of siderite and hematite were also used to carry out the self-magnetization experiment.The results were consistent with those of the single-mineral experiments and the mixed mineral experiments.The recovery rate of the actual mixture minerals improved from 46.3% up to 63.1%,realizing the self-magnetization of mineral samples.