Gas-based reduction dephosphorization and phosphorus occurrence form of high-phosphorus oolitic hematite
The reserves of high-phosphorus oolitic hematite in China are abundant.But due to its complex mineral composition and high phosphorus content,it cannot be directly used as a raw material for ironmaking,which seriously limits its utilization value.Therefore,taking high phosphorus oolitic hematite as the research object,the influence of four process parameters,including reduction temperature,holding time,alkalinity,and hydrogen flow rate,on the dephosphorization effect was studied using a gas based reduction magnetic separation process.The research results indicate that as the reduction temperature,holding time,alkalinity,and hydrogen flow rate increase,the iron grade and iron recovery rate gradually increase,while the phosphorus content decreases.By comparing the microstructure of each reduction product under different conditions,it was observed that the reduction temperature,holding time,and alkalinity can all promote the aggregation and growth of iron particles and their separation from gangue minerals,while the change in hydrogen flow rate is not significant.Under the conditions of reducing temperature of 1050 ℃,holding time of 90 min,alkalinity of 1.2,and hydrogen flow rate of 200 mL/min,all indicators are optimal.At this time,the iron grade of the concentrate is 77.53％,the iron recovery rate is 77.94％,the mass fraction of phosphorus is 0.26％,and the dephosphorization rate reaches 71.74％.
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