| This paper describes the results on the formation of iron powders using the waste pickling liquor of steel. 1) The formation of iron powders is easily proceeded when the iron oxides and iron hydroxides precipitated at pH 12-13 in the pickling liquor are reduced for 1 hour under conditions of the flow rate of 0.3 1/min of hydrogen at 750℃. The particle size of the iron powders is in the range of 1-5 ㎛ and they have saturation magnetization of 178.5emu/g at 8 kOe which is equivalent to 82% of the theoretical value of pure Fe. 2) As the result of filtering from the pickling liquor of steel, the residue concentrates of the filtrate solution were conformed to be mainly of Cl, Cr^(3-), Cr^(64), and Zn with their concentrations of 3282, 0.077, 0.084 and 0.035 ppm, respectively. Accordingly. it may not be a problem as a foul water of urban. |
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