Abstract
High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93% phosphorus (present as collophane). Low-intensity magnetic separation (LIMS) was combined with reverse flotation to increase the iron and reduce the phosphorus contents of the roasted product. The results showed that an optimized iron ore concentrate with an iron grade of 67.54%, phosphorus content of 0.11%, and iron recovery of 78.99% were obtained under LIMS conditions that employed a grind of 95% −0.038 mm and a magnetic field of 0.10 T. Optimized rougher reverse-flotation conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 800 g/t, 1000 g/t, and 40 g/t, respectively; optimized scavenging conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 400 g/t, 500 g/t, and 20 g/t, respectively. Study of the mechanism of phosphorus reduction showed that the toluenesulfonamide could be adsorbed on the surface of quartz after the action of starch, but adsorption was significantly weakened. The starch inhibitor negatively affected adsorption on quartz, but positively influenced adsorption of phosphorus minerals.
Highlights
IntroductionSuspended flash magnetic roasting is a new technology for the treatment of refractory iron ore
Suspended flash magnetic roasting is a new technology for the treatment of refractory iron ore.Raw materials, such as refractory iron ores with low grade and low-intensity magnetization or iron-containing tailings, can be processed by drying and grinding without need of pelletization
High-phosphorus oolitic iron ore from Western Hubei that had been processed by suspended flash magnetic roasting was collected as the test sample
Summary
Suspended flash magnetic roasting is a new technology for the treatment of refractory iron ore. Raw materials, such as refractory iron ores with low grade and low-intensity magnetization (e.g., siderite, limonite, hematite, and goethite) or iron-containing tailings, can be processed by drying and grinding without need of pelletization. The raw material ore powder is exchanged with hot exhaust gas discharged from the magnetic roaster after a multi-stage cyclone preheater and enters the suspended magnetic roasting reaction furnace, which is characterized by its high temperature and weakly reducing atmosphere [1,2,3]. The fine dry mineral powder is contacted in a suspended state with CO and reacts instantaneously. The ore powder after magnetic roasting is subjected to a multi-stage
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