镜铁矿细粒粉矿制粒—回转窑磁化焙烧及分选研究

发布时间：2018-09-10 09:48

【摘要】：酒钢镜铁矿粉矿矿物组成和嵌布关系复杂,采用常规选矿工艺难以有效分选。磁化焙烧是目前处理这类粉矿最为有效的方法,回转窑磁化焙烧是合理的工艺,但细粒级粉矿(尤其是0~1 mm粒级)不能直接进入回转窑磁化焙烧,磨矿造球又存在精矿品位低,工艺复杂,成本高等问题。本论文结合粉矿自身特点,采用制粒回转窑磁化焙烧工艺处理该粉矿,简化了工艺,降低了成本,同时获得良好的选矿指标,并对焙烧过程、分选流程、影响精矿品位因素和经济效益进行了研究。镜铁矿粉矿主要含铁矿物为镜铁矿、菱铁矿和褐铁矿,脉石矿物主要为石英、碧玉和铁白云石,含铁矿物嵌布粒度细,且部分脉石矿物含铁,使得粉矿矿物组成和嵌布关系复杂,常规选矿方法难以分选。粉矿在膨润土配比1.2%,水分8%、制粒时间10 min条件下获得3~5 mm的制粒小球,制粒小球使用Φ0.21×2 m电热回转窑在外配2.5%兰炭,焙烧温度750°C,窑内停留时间60 min,填充率20%条件下磁化焙烧,获得铁品位53.01%,回收率87.66%的选矿指标。结合焙烧矿XRD图对焙烧过程进行分析,验证了焙烧温度选取的合理性。焙烧后大部分含铁矿物还原成磁铁矿,提高了矿石可选性。制粒小球焙烧后,0~1 mm粒级仅增加了6.78%,粉化率较低。Φ0.65-0.45×9 m变径回转窑对该粉矿的焙烧效果良好,未产生结圈现象。对焙烧温度740~760°C,兰炭配比2.5%条件下的焙烧矿进行磁选流程试验,经过一粗一扫一精流程,获得精矿品位56.16%、回收率85.84%的良好指标。分析认为精矿中碧玉等脉石矿物、菱铁矿还原而来的磁铁矿影响了精矿品位,难以通过磨矿提高单体解离度的方法优化精矿品位。采用制粒-回转窑磁化焙烧-磁选工艺处理镜铁矿细粒粉矿,提高了粉矿的利用效率,获得良好的经济效益,为此类粉矿的利用提供了借鉴。
[Abstract]:The mineral composition and distribution relationship of ophanite ore in Jiugang are very complicated, so it is difficult to separate ore effectively by conventional dressing technology. Magnetization roasting is the most effective method to treat this kind of powdery ore at present. Magnetization roasting in rotary kiln is a reasonable process, but fine grained powder (especially 0 ~ (1 mm) can not directly enter the magnetization roasting in rotary kiln, and the concentrate grade is low in grinding and pelletizing. Complex process, high cost and other problems. In this paper, according to the characteristics of the powder ore, the magnetization roasting process of the granulating rotary kiln is used to treat the powder ore, which simplifies the process, reduces the cost, and obtains a good mineral dressing index, and the roasting process and the separation process are also given. The factors affecting the grade of concentrate and the economic benefit were studied. The main ferric minerals are goerite, siderite and limonite, the gangue minerals are mainly quartz, Jasper and dolomite, and some gangue minerals contain iron. The relation between mineral composition and distribution is complicated, and it is difficult to separate ore by conventional dressing method. The granulated pellets of 3 ~ 5 mm were obtained under the condition of bentonite ratio 1.2, moisture 8 and granulation time 10 min. The pelletizing pellets were magnetized roasted with 2.5% blue charcoal in 桅 0.21 脳 2 m electrothermal rotary kiln, the calcination temperature was 750 掳C, and the residence time was 60 min, filling rate 20%. The iron grade of 53.01 and the recovery rate of 87.66% were obtained. The roasting process was analyzed with XRD diagram of roasting ore, and the rationality of roasting temperature was verified. Most of the iron-bearing minerals are reduced to magnetite after calcination, which improves the separability of ore. After roasting, the particle grade of 0 ~ 0 ~ 1 mm increased only 6.78%, and the pulverization rate was low. The roasting effect of 桅 0.65-0.45 脳 9 m rotary kiln was good, and there was no ring formation phenomenon. The magnetic separation process of roasting ore under the conditions of 740,760 掳C and 2.5% ratio of blue and carbon was carried out. The fine index of concentrate grade 56.16g and recovery rate 85.84% were obtained after one coarse one sweep and one fine process. It is considered that the grade of concentrate is affected by the reduction of siderite from gangue minerals such as Jasper, so it is difficult to optimize the grade of concentrate by grinding to improve the degree of monomer dissociation. The granulating rotary kiln magnetization roasting-magnetic separation process has been used to treat the fine granulated ore of gooseite. The utilization efficiency of the fine ore has been improved and good economic benefit has been obtained. It provides a reference for the utilization of this kind of powder ore.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD951

【相似文献】