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Iron recovery from the waste generated during the cutting of granite

机译:从切割过程中产生的废物中回收铁 花岗岩

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摘要

Metallic iron is present in the waste left whengranite blocks are cut. Thus, the purpose of this study wasto characterize this waste using chemical and particle sizeanalyses. To achieve this, X-ray diffraction and scanningelectron microscopy coupled with electron back-scattereddiffraction were used. To find the method with the bestmetallic iron recovery from the waste of ornamental rock,three distinct methods were examined: magnetic separation,table concentration and cyclone processing. The firstmethod involved three steps: (1) use of a wet high-intensitymagnetic separator, where only the equipment’s remainingmagnetic field was present; (2) the material from the firststep was then submitted to separation again, this time usinga magnet for rare earth particles; and (3) this material aftertwo separation processes was finally submitted to ferromagneticseparation. The second method used a concentrationtable set at various inclinations, oscillationfrequencies and wash flow rates. Meanwhile, for the thirdmethod, the cyclone tests, only the water pressure wasvaried. After each test, a chemical analysis was performedto determine the metallic iron present in each sample. Thetests revealed that magnetic separation presents the bestresults. Using this technique, a ferrous concentrate with93 % metallic iron content and a granite concentrate withonly 0.6 % metallic iron were obtained. On the other hand,in the table concentrator tests, the ferrous concentrate only
机译:切割花岗岩块时残留的废料中存在金属铁。因此,本研究的目的是使用化学和粒度分析来表征这种废物。为了达到这个目的,使用了X射线衍射和扫描电子显微镜以及电子背散射衍射。为了找到从观赏石废料中回收最佳金属铁的方法,研究了三种不同的方法:磁选,表浓缩和旋风分离器处理。第一种方法包括三个步骤:(1)使用湿式高强度磁选机,其中仅存在设备的剩余磁场; (2)然后将第一步得到的材料再次进行分离,这次使用的磁体是稀土颗粒; (3)经过两次分离后,该材料最终进行了铁磁分离。第二种方法是在不同的倾斜度,振荡频率和洗涤流速下使用浓度表。同时,对于第三种方法,旋风测试,仅改变水压。每次测试后,进行化学分析以确定每个样品中存在的金属铁。测试表明,磁分离法表现出最好的结果。使用该技术,获得了金属铁含量为93%的铁精矿和仅金属铁含量为0.6%的花岗岩精矿。另一方面,在台式选矿厂测试中,仅铁精矿

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