Abstract
The effective utilization and clean recycling of tailings are important to solve land occupation and waste mine pollution problems. A semi-industry experiment of hydrogen-based mineral phase transformation for tailings is conducted with a roasting temperature of 500 °C, a reducing gas concentration of 20 %, a total gas volume of 12 m3/h, and a handing capacity of 100 kg/h. A concentrate product with an iron grade of 66.75 % and a recovery of 82.79 % was obtained. The detail roasted iron phases of 23.96 % Fe3O4 (A) and 47.93 % Fe3O4 (B) were obtained. The maximum saturation magnetization increased from 6.69 to 18.96 A·m2·kg−1 after roasting. The surface of Fe3O4 occurred on the iron mineral surface. The SEM-EDS results showed the order of reduce behavior. In addition, the pollutions of the roasting process were controlled strictly, and the final benefit was calculated to be $33.86 million.
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