中文摘要：

利用内径150mm的D型有机玻璃流化床模型，对澳矿、巴西矿、北方矿和钒钛矿典型铁矿粉的流化特性进行了实验研究，获得了其流化特性曲线、初始流化速度和最大床层压降，并将初始流化速度的实测值和理论计算值进行了比较分析．结果表明，矿粉粒度是影响其流化特性的最主要因素，粒径越大，床层所需要的初始流化速度越大，实测值和理论估算值基本相符；粒度小于0．125mm钒钛矿流动性较差，在流化过程中易出现沟流现象；粒度范围较宽的矿粉，完全流态化时，细矿粉随气流夹带逸出明显；在粒度相同的情况下，几种不同的铁矿粉的开始流化速度接近，而床层压降有较大差异，巴西矿的床层压降明显大于其他三种铁矿粉．最大床层压降的最小值均出现在粒度为0．25～0．425mm，为铁矿粉流态化还原过程中较适宜的粒度范围．

英文摘要：

Fluidization characteristics of some typical iron ore powders （Australian ore, Brazilian ore, Beifang ore, schreyerite ore） were studied using a D-type organic glass tube model with 150 mm diameter. The pressure drop as a function of the gas velocity for the iron ore powder was obtained, the minimum fluidized velocity and the largest pressure drop showed a basic agreement with the theoretically estimated values. The results indicated that the particle size was the main influential factor on the fluidization characteristics, the minimum fluidization velocity increased obviously with increasing of the particle size. The schreyerite ore with the particle size less than 0.125 mm showed a poor flowability, and channeling occurred in the process of fluidization. The particularly fine iron ore escaped from fluidized bed along with the gas flow when the powder in broader particle size was perfectly fluidized. For the four different iron ores with the same particle size, the minimum fluidized velocity was close, but the pressure drop was quite different. The bed pressure drop of Brazilian ore was much greater than other three iron ores. All the minimum value of the largest bed pressure drop appeared between 0.25 mm and 0.45 mm, which was considered as suitable particle size range in the iron ore fluidized reduction process.