吉林临江铁锰矿分离技术研究
摘要
自1996年以来,我国钢铁产量一直居世界首位。钢铁工业生产的飞速发展,导致铁矿石需求和生产的迅猛增长,铁矿石生产呈现供不应求的局面。我国从2003年起,成为世界进口铁矿石最多的国家,2007年铁矿石进口量高达3.83亿吨。2008年进口铁矿石的价格再次上涨65%,使本已在高位运行的铁矿石价格再次大幅攀升。国家虽然出台了一些相关的宏观调控政策,以抑制部分行业的过快发展,减缓钢铁生产的增长,但是随着我国居民消费结构的升级、工业化和城镇化步伐的加快,对钢铁产品的需求还将继续增加,钢铁工业还将继续发展,铁矿石大量依赖进口的局面难以在短期内得到扭转。
我国高品位的优质铁矿资源逐渐枯竭,随之而来的国际铁矿石价格的大幅提高,迫使我们必须以战略性的眼光,有预见性地开发潜在的铁矿资源。我国铁矿石的主要特点是“贫”、“细”、“杂”,平均铁品位32%,比世界平均品位低11个百分点。我国97.5%的铁矿石需要选矿处理,并且复杂难选的红铁矿所占比例较大(约占铁矿石储量的20.8%)。在这种情况下,开展难选低品位铁矿石的选矿关键技术研究就显得尤为重要。
本论文以吉林临江难选铁锰矿(又名羚羊铁矿石)石为研究对象,在系统工艺矿物学研究的基础上,系统研究了采用正浮选、反浮选、磁选、焙烧磁选等多种工艺时各种试验条件对该铁锰矿石分选效果的影响,并着重研究了采用焙烧磁选工艺时,磁化焙烧温度、不同焙烧粒级、焙烧时间、还原剂种类和添加量等条件对焙烧磁选效果的影响,研究结果表明,临江铁锰矿石的正反浮选试验结果均不佳,铁矿物不能得到有效分离；用焙烧磁选方法处理铁锰矿石可得到符合要求的铁精矿,即焙烧—磁选是处理临江铁锰矿石最有效的分选工艺,当磁化焙烧温度为750-800°C,焙烧时间为40-120min,实验室获得了铁精矿品位最高达到67%的产品；以河北丰宁丰东煤矿次烟煤为还原剂时,煤的适宜填加量为8%,可以获得铁精矿品位58%以上,回收率70%以上的较理想指标；分级焙烧试验结果表明,粗粒级(-20mm+12mm)矿石焙烧时可获得品位为56.32%,回收率为96%的分选结果,比中、细粒级矿石焙烧磁选相比效果更好,采用粗粒级焙烧是处理临江铁锰矿石的适宜方案。
上述研究成果为高效合理利用吉林临江难选铁锰矿石提供了参考依据。
Since 1996, the steel output of China is always most in the world. With the rapid development of steel industrial production, it is caused that violent increase of demand and production of iron ores, and demand of iron ores exceeds supply. From 2003, China becomes most country for import quantity of iron ores, the import quantity of iron ores is as high as 383 millions tons in 2007. The price of import iron ores rise 65% again in 2008, which makes the high price of iron ores rise substantially again. Although some related macro-control policies were enacted by the government to restrain exceed rapid development of partial professions and slows down the increase of steel production, however with upgrade of consumed structure of resident and development of industrialization and urbanization, the demand for steel product will still increase continuously, steel industry will still be developed continuously, the situation that the iron ores relies on importing in large quantities is hard to get torsion in short period.
The high quality resource of iron ores is gradually exhausted in China, in addition of the price of iron ores rise substantially, so we have to develop potential iron ores resource with strategic and foresighted vision. The major characteristic of the iron ores of China is "poor", "fine" and "miscellaneous", average iron grade is 32% and lower 11 percents than world average iron grade, the iron ores of the 97.5% need be handled by mineral processing, and the proportion of complex hematite which hard to separated is greater (20.8% of iron ores reserves). Therefore, it is particularly important to develop the crucial technology of mineral processing for low grade iron ores hard to be separated.
With Jilin Linjiang iron-manganese ore(namely Jilin antelope iron ore) as research object, on the foundation of systematic technology mineralogy research, the effect of various testing conditions on separation results of the iron-manganese ore had been studied systematicly with various technology, such as direct flotation, reverse flotation, magnetic separation, roast-magnetic separation, and so on. The roast-magnetic separation conditions have been researched emphatically, such as matnetizing roast temperature, roast size, roast time, the kind and adding quantity of reductant, and so on. The study results show, direct and reverse flotation test effect of Linjiang iron-manganese ore aren't so good, iron minerals aren't separated effectively, and the iron concentrate that accords with quality requirement can be got by roast-magnetic separation technology, that is said, roast-magnetic separation technology is most effective process to separate Linjiang iron-manganese ore, when matnetizing roast temperature is 750℃-800℃, roast time is 40-120 min, the concentrate of 67% Fe grade can be got; With secondly bituminite of Hebei Fongning coal mine as reductant, suitable add quantity of coal is 8%, the concentrate of over 58% Fe grade and 70% recovery can be got. The results of classification roast test show, the separation results of 56.32% grade,96% recovery can be got by roasting of coarse size ore (-20mm+12mm), the roast-magnetic separation of coarse size ore is better than middle and fine size ore, the roast of coarse size ore is suitable for Linjiang iron-manganese ore.
Above-mentioned research results provide reference basis for making use of Jilin Linjiang iron-manganese ore efficiently and reasonably,.
我国高品位的优质铁矿资源逐渐枯竭,随之而来的国际铁矿石价格的大幅提高,迫使我们必须以战略性的眼光,有预见性地开发潜在的铁矿资源。我国铁矿石的主要特点是“贫”、“细”、“杂”,平均铁品位32%,比世界平均品位低11个百分点。我国97.5%的铁矿石需要选矿处理,并且复杂难选的红铁矿所占比例较大(约占铁矿石储量的20.8%)。在这种情况下,开展难选低品位铁矿石的选矿关键技术研究就显得尤为重要。
本论文以吉林临江难选铁锰矿(又名羚羊铁矿石)石为研究对象,在系统工艺矿物学研究的基础上,系统研究了采用正浮选、反浮选、磁选、焙烧磁选等多种工艺时各种试验条件对该铁锰矿石分选效果的影响,并着重研究了采用焙烧磁选工艺时,磁化焙烧温度、不同焙烧粒级、焙烧时间、还原剂种类和添加量等条件对焙烧磁选效果的影响,研究结果表明,临江铁锰矿石的正反浮选试验结果均不佳,铁矿物不能得到有效分离；用焙烧磁选方法处理铁锰矿石可得到符合要求的铁精矿,即焙烧—磁选是处理临江铁锰矿石最有效的分选工艺,当磁化焙烧温度为750-800°C,焙烧时间为40-120min,实验室获得了铁精矿品位最高达到67%的产品；以河北丰宁丰东煤矿次烟煤为还原剂时,煤的适宜填加量为8%,可以获得铁精矿品位58%以上,回收率70%以上的较理想指标；分级焙烧试验结果表明,粗粒级(-20mm+12mm)矿石焙烧时可获得品位为56.32%,回收率为96%的分选结果,比中、细粒级矿石焙烧磁选相比效果更好,采用粗粒级焙烧是处理临江铁锰矿石的适宜方案。
上述研究成果为高效合理利用吉林临江难选铁锰矿石提供了参考依据。
Since 1996, the steel output of China is always most in the world. With the rapid development of steel industrial production, it is caused that violent increase of demand and production of iron ores, and demand of iron ores exceeds supply. From 2003, China becomes most country for import quantity of iron ores, the import quantity of iron ores is as high as 383 millions tons in 2007. The price of import iron ores rise 65% again in 2008, which makes the high price of iron ores rise substantially again. Although some related macro-control policies were enacted by the government to restrain exceed rapid development of partial professions and slows down the increase of steel production, however with upgrade of consumed structure of resident and development of industrialization and urbanization, the demand for steel product will still increase continuously, steel industry will still be developed continuously, the situation that the iron ores relies on importing in large quantities is hard to get torsion in short period.
The high quality resource of iron ores is gradually exhausted in China, in addition of the price of iron ores rise substantially, so we have to develop potential iron ores resource with strategic and foresighted vision. The major characteristic of the iron ores of China is "poor", "fine" and "miscellaneous", average iron grade is 32% and lower 11 percents than world average iron grade, the iron ores of the 97.5% need be handled by mineral processing, and the proportion of complex hematite which hard to separated is greater (20.8% of iron ores reserves). Therefore, it is particularly important to develop the crucial technology of mineral processing for low grade iron ores hard to be separated.
With Jilin Linjiang iron-manganese ore(namely Jilin antelope iron ore) as research object, on the foundation of systematic technology mineralogy research, the effect of various testing conditions on separation results of the iron-manganese ore had been studied systematicly with various technology, such as direct flotation, reverse flotation, magnetic separation, roast-magnetic separation, and so on. The roast-magnetic separation conditions have been researched emphatically, such as matnetizing roast temperature, roast size, roast time, the kind and adding quantity of reductant, and so on. The study results show, direct and reverse flotation test effect of Linjiang iron-manganese ore aren't so good, iron minerals aren't separated effectively, and the iron concentrate that accords with quality requirement can be got by roast-magnetic separation technology, that is said, roast-magnetic separation technology is most effective process to separate Linjiang iron-manganese ore, when matnetizing roast temperature is 750℃-800℃, roast time is 40-120 min, the concentrate of 67% Fe grade can be got; With secondly bituminite of Hebei Fongning coal mine as reductant, suitable add quantity of coal is 8%, the concentrate of over 58% Fe grade and 70% recovery can be got. The results of classification roast test show, the separation results of 56.32% grade,96% recovery can be got by roasting of coarse size ore (-20mm+12mm), the roast-magnetic separation of coarse size ore is better than middle and fine size ore, the roast of coarse size ore is suitable for Linjiang iron-manganese ore.
Above-mentioned research results provide reference basis for making use of Jilin Linjiang iron-manganese ore efficiently and reasonably,.
引文
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