酒钢难选铁矿石的磁化焙烧—磁选工艺研究

发布时间：2018-05-18 02:11

本文选题：镜铁山矿 + 白尖矿　；参考：《华北理工大学》2015年硕士论文

【摘要】：酒钢目前的块矿竖炉磁化焙烧工艺存在铁回收率低和粉矿难以处理的问题,迫切需要开发新的铁矿石处理工艺,本文在研究原燃料物理化学性能的基础上,通过实验室模拟,系统地研究酒钢镜铁山矿和白尖矿原矿粉的生球造球、干燥、磁化焙烧及磁选工艺过程,从中发现:镜铁山矿原矿粉造球过程中将膨润土配比控制为2%左右、煤粉配比控制为2%左右、原矿粉粒度中-200目比例控制为80%、生球水分控制在9.5%左右是比较适宜的。在生球干燥过程中将球团矿层厚度控制为200mm左右,干燥气流速度控制为1m/s左右、干燥气流温度控制为300℃左右、干燥时间控制为10min可以满足原矿粉球团矿磁化焙烧的需要。用高温反应管在800℃隔绝空气条件下对镜铁山矿原矿粉球团进行磁化焙烧40min,磁化焙烧后镜铁山矿原矿粉球团矿采用两段磨矿和两段磁选流程,可以获得TFe为61.86%左右的铁精矿,铁精矿产率和TFe回收率分别达到52.10%和85.07%。白尖矿原矿粉造球过程中将膨润土配比控制为1~2%、煤粉配比控制为2%左右、原矿粉粒度中-200目比例控制为60%~80%,生球水分控制为9.0%左右,可以生产出合格的原矿粉生球。在生球干燥过程中将球团矿层厚度控制为200mm左右,干燥气流速度控制为1m/s左右、干燥气流温度控制为300℃左右、干燥时间控制为10min是比较适宜的。用高温反应管在800℃隔绝空气条件下对白尖矿原矿粉球团磁化焙烧40min,磁化焙烧后白尖矿原矿粉球团矿采用两段磨矿和两段磁选流程后可以获得TFe为59.03%左右的铁精矿,铁精矿产率和TFe回收率分别达到42.33%和74.54%。
[Abstract]:The magnetization roasting process of the current block shaft furnace of Jiuquan Iron and steel company has the problems of low iron recovery and hard to deal with the powder ore. It is urgent to develop a new iron ore treatment process. On the basis of studying the physical and chemical properties of the raw fuel, this paper systematically studies the pellet making and drying of the raw mineral powder of Jiuquan Iron hill and white pointed ore through laboratory simulation. The process of magnetization roasting and magnetic separation shows that the ratio of bentonite is controlled to about 2%, the ratio of pulverized coal is controlled to about 2%, the ratio of -200 mesh in the particle size of raw mineral powder is 80%, and the water control of raw ball is about 9.5%. The thickness of pellet layer is controlled to 20 in the drying process of raw ball. Around 0mm, the drying air velocity is about 1m/s, the drying air temperature is about 300 C. The drying time is 10min, which can satisfy the need of magnetization roasting of the raw ore powder pellet. The magnetized roasting of the original ore powder pellets of the mirror Tieshan mine was roasted for 40min with the high temperature reaction tube at 800 degrees centigrade. The ore powder pellet uses two stages of grinding and two sections of magnetic separation process. The iron concentrate with TFe of 61.86% can be obtained. The yield of iron concentrate and the recovery rate of TFe can reach 52.10% and 85.07%. white pointed ore powder in the process. The ratio of bentonite is controlled to 1~2%, the ratio of pulverized coal is 2% left right, and the proportion of -200 mesh in the particle size of the raw ore powder is 60%~80%, The water control of the raw ball is about 9%, which can produce a qualified raw ball of raw mineral powder. In the process of drying the ball, the thickness of the pellet is controlled to about 200mm, the drying air velocity is about 1m/s, the drying air temperature is controlled to about 300 C, and the drying time is 10min is more suitable. The high temperature reaction tube is cut off at 800. The original ore powder pellets of white pointed ore were magnetized and roasted for 40min under gas conditions. After magnetized roasting, the original ore powder pellets in white pointed ore were used in two stages of grinding and two stages of magnetic separation. The iron concentrate of about 59.03% of TFe could be obtained. The yield of iron concentrate and the recovery rate of TFe reached 42.33% and 74.54%., respectively.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951;TD924

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