巴西赤铁精矿成球性能试验

为确定铁品位为67.45%、SiO₂含量为2.54%、-0.045 mm占95.72%、比表面积为1 647.00 cm²/g的巴西Carajas赤铁精矿造球的合适工艺技术参数，以铁品位为14.38%、SiO₂含量为67.22%、-0.045 mm占87.27%、比表面积为1 698.85 cm²/g的山西某赤铁矿强磁选尾矿为调硅剂，以吸水率为436.01%、蒙脱石含量为62.22%、-0.074 mm占99.4%的某膨润土为黏结剂，以生球落下强度、抗压强度、爆裂温度为评价指标，研究了生球原料的成分和性质、造球工艺参数对生球性能的影响。试验确定的赤铁精矿（含所加铁尾矿）的比表面积为1 768 cm²/g，膨润土的质量分数为0.8%，尾矿与精矿的质量比为2.2%，赤铁精矿水分为8.0%，造球过程中生球的水分为10.0%，造球时间为12 min，造球盘的转速为22 r/min，对应的生球落下强度为6.8次，抗压强度为14.15 N，爆裂温度为427 ℃。

Pelletizing Properties of Hematite Concentrate from Brazil

The effects of content and properties of raw materials and pelletizing parameters on properties of green pellet were studied in order to determine the appropriate technology parameters for pelletizing of a Brazilian Carajas hematite concentrate with Fe grade of 67.45%,SiO₂ content of 2.54%, particle size of 95.72% passing -0.045 mm and specific surface area of 1 647 cm²/g as main raw material, the hematite tailings from Shanxi with Fe grade of 14.38%, SiO₂ content of 67.22%,particle size of 87.27% passing 0.045 mm and specific surface area of 1 698.85 cm²/g produced from high intensity magnetic separation as silicon agents, bentonite with water absorption rate of 436.01%, montmorillonite content of 62.22% and particle size of 99.4% 0.074 mm used as binder, with drop strength, compressive intensity, and burst temperature of green pellet as evaluating index. The result showed that the optimum conditions for pelletizing were hematite concentrate specific surface area of of 1 768 cm²/g, bentonite dosage of 0.8%, ratio of tailings to hematite concentrate of 2.2%, moisture content of hematite concentrate at 8.0%, moisture content of green pellet at 10.0% during pelletizing, pelletizing for 12 minutes, revolving speed of the plate at 22 r/min, and the corresponding dropping strength and compressive strength were 6.8 times and 14.15 N respectively with critical burst temperature of 427 ℃.