摘要
对菱铁矿和褐铁矿精矿进行了造球、焙烧试验研究,结果表明:在菱铁精矿中配加褐铁矿的同时配加磁铁矿,既可提高生球强度,又可提高爆裂温度;链篦机—回转窑焙烧该球团时,操作难度大,球团矿质量差;采用烧结法焙烧菱铁矿和褐铁矿球团时,因高温保持时间短而导致球团强度低,配入磁铁矿后,既延长了高温保持时间,又提高了成品率、转鼓强度和抗压强度,增加预热段可改善烧结指标;用带式焙烧法焙烧菱铁矿和褐铁矿球团时,获得了成品率为98.26%,利用系数为0.654t/(m2·h),转鼓强度为80.65%和抗压强度为1762N/个的球团矿。该研究为我国储量丰富,但难焙烧的菱铁矿和褐铁矿的开发利用提供了新思路。
Balling and roasting of pellet with siderite and limonite is investigated in this paper. The results show that green-ball strength and shock temperature are increased when adding limonite and magnetite into siderite. It was difficult to roast this kind of ore pellet using grate-kiln, and the quality of pellet is bad. Because the time of keeping high temperature is short during sintering, the compressive strength of pellet is low. The high temperature time prolonged and the yield, tumbler strength and compressive strength increased when adding magnetite. Besides, sintering index improved when increasing preheating process. The yield is 98.26%, utilization coefficient is 0.654 t/（m^2·h）, tumbler strength is 80.65% and compressive strength is 1762 N per pellet when using fabric calcinations. The study supplies new method of using siderite and limonite which are abundant but difficult to be roasted.
基金
国家杰出青年科学基金(50725416)
