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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Evaluation of alternative solid media for coal beneficiation using an air dense-medium fluidized bed
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Evaluation of alternative solid media for coal beneficiation using an air dense-medium fluidized bed

机译：空气致密介质流化床评价煤矿替代固体培养基

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摘要

A study was carried out to identify alternative dense media with potential for use in coal beneficiation in South Africa. Magnetite, pyrrhotite, silica sand, granulated blast furnace slag, and coal discards were tested. Magnetite and pyrrhotite provided the most uniform and stable bed densities, with bed density variation less than 0.7% and standard deviation less than 0.0025 g/cms. A100% magnetite bed yielded a product with an ash content of about 20.30% and calorific value of about 25.24 MJ/kg from a feed coal of size fraction -13 +6 mm and ash content of 39.27%. A cleaner coal product containg about 14.50% ash and with calorific value of 27.30 MJ/kg was obtained from a bed of pyrrhotite and magnetite blend at a weight ratio of 40:60. The same blend reduced the total sulphur content from 2.49% in the feed coal to about 0.41% at a cut density of 1.63 g/cm~3 at a probable error (Ep) of 0.083. The beneficiation of coal in a pure magnetite bed was not as effective as with the pyrrhotite-magnetite mixed bed.
机译：进行了一项研究，以确定替代密集介质，占南非煤炭的潜力。磁铁矿，烟草酸盐，二氧化硅砂，粒状高炉炉渣和煤炭丢弃。磁铁矿和PyrrHotite提供了最均匀且稳定的床密度，床密度变异小于0.7％，标准差小于0.0025克/厘米。 A100％磁铁矿床产生灰分含量约为20.30％的灰分含量约为25.24mJ / kg，尺寸分数-13 + 6 mm，灰分含量为39.27％。可选择约14.50％的灰分和热量值为27.30mJ / kg的更清洁的煤产物是从Pyrlotite和磁铁矿混合物的重量比为40:60。相同的混合物将进料煤中的2.49％的总硫含量降低至约0.41％，在可能的误差（EP）为1.63g / cm〜3的切割密度为0.083。纯磁铁矿床中的煤的矿物与Pyrlotite-Mariafalite混合床的煤不如如上有效。

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