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Development of an alternative to magnetite for use as heavy media in coal washeries

机译：开发磁铁矿替代品，用作洗煤厂的重介质

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摘要

Magnetite is presently used by many coal washeries in India as a dense medium in dense-medium cyclones for coarse coal cleaning. Considering the high cost of magnetite, efforts were made at R&D, Tata Steel, India to develop alternatives to magnetite. Studies revealed that the magnetic fraction of blast furnace flue dust (MFFD) had requisite properties for use as heavy media. Systematic studies in the laboratory, at pilot-scale and then the plant showed that MFFD can function as a dense medium. A process flow route was developed for the generation of MFFD, which has now been patented by the company. The ball mill-hydrocyclone circuit generally used in coal washeries for grinding magnetite can be used to generate the MFFD with slight modifications. However, close control of the size distribution of the MFFD is required. Also nucleonic gauges, if any in the plant need to be re-calibrated.
机译：目前，印度许多洗煤厂都使用磁铁矿作为致密介质，在致密介质旋风分离器中进行粗煤清洁。考虑到磁铁矿的高成本，印度塔塔钢铁公司的研发部门努力开发磁铁矿的替代品。研究表明，高炉烟道粉尘（MFFD）的磁性部分具有用作重介质的必要性能。在实验室进行了中试规模的系统研究，然后工厂进行了试验，结果表明MFFD可以用作致密培养基。已开发了用于生成MFFD的工艺流程路线，该路线现已获得该公司的专利。通常用于选煤厂以研磨磁铁矿的球磨机-水力旋流器回路可用于生成MFFD，但需要进行一些改动。但是，需要严格控制MFFD的大小分布。如果需要，还需要对核子规进行校准。

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