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- W2016641570 abstract "Removal of gangue materials, principally silica and alumina, from a magnetically-separated, iron-rich fraction of bituminous coal fly ash shows promise of yielding an iron ore grade concentrate. As separated, the iron-rich fraction contains 65 to 75 wt. % iron oxides or about 50 % of the iron originally in the ash.A hydrothermal caustic extraction followed by a mild acid wash has been found to give a residue containing as high as 95 % iron oxides, a concentration that compares favorably with that found in taconite and other concentrate pellets used as feed to blast and electric reduction furnaces. The controlling step in the process is the caustic extraction which dissolves the highly insoluble silica and allumina from the fly ash matrix. As the extraction proceeds, aluminate and silicate compounds precipitate onto the surface of the iron-rich particles and must be removed by a subsequent acid wash. The precipitate does not interfere significantly with the dissolution of silica and alumina by the caustic solution.During the caustic extraction, the solution rapidly becomes saturated, and, if it were not for the precipitation, dissolution of the gangue from the ash would cease. The simultaneous dissolution-precipitation allows use of high solid to liquid ratios and reuse of the caustic as the extraction proceeds. A typical extraction residue contains, on a weight basis, about 65% Fe, 4% Al203 and 2% SiO2. Pelleting and sintering should give an iron oxide produce suitable for use in the manufacture of iron and steel." @default.
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- W2016641570 date "1982-08-01" @default.
- W2016641570 modified "2023-09-27" @default.
- W2016641570 title "Production of an iron ore concentrate from the iron-rich fraction of power plant fly ash" @default.
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- W2016641570 doi "https://doi.org/10.1016/0166-3097(82)90078-5" @default.
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