Fig. 1. The proposed system of mine water treatment.
Fig. 2. The mechanism of iron removal using solid catalyst.
Fig. 3. Iron ion concentration before and after air oxidation for each Fe(OH)3.
Fig. 4. FT-IR spectra of solid catalyst, magnetite and solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material.
Fig. 5. FT-IR spectra of solid catalyst, magnetite and solid catalyst-modified magnetite using FeCl3 as a starting material.
Fig. 6. Iron ion concentration before and after air oxidation using pure magnetite, pure solid catalyst and solid catalyst-modified magnetite. (N=3, N=4 for only modified magnetite using FeCl3.)
Fig. 7. Potentiometric titration of distilled water, pure magnetite and pure solid catalyst (Fe2(SO4)3 or FeCl3 as a starting material).
Fig. 8. The flow of the separation process of mine water.
Fig. 9. Suspension before and after sedimentation for 30 minutes.
TABLE Ⅰ COMPARISON OF EXISTING MINE WATER PURIFICATION METHODS.
TABLE Ⅱ EXPERIMENTAL CONDITIONS OF AIR OXIDATION USING SOLID CATALYSTS.
TABLE Ⅲ MAGNETIC SUSCEPTIBILITY AND PARTICLE SIZE OF SOLID CATALYST.
TABLE Ⅳ THE RESULT OF WEIGHT MEASUREMENT.
TABLE Ⅴ THE RESULT OF PARTICLE SIZE.
TABLE Ⅵ EXPERIMENTAL CONDITION OF AIR OXIDATION USING SOLID CATALYST-MODIFIED MAGNETITE.
TABLE Ⅶ THE REMOVAL RATIO OF IRON ION USING MAGNETITE, SOLID CATALYST AND SOLID CATALYST-MODIFIED MAGNETITE.
TABLE Ⅷ pH CHANGE IN SOLID CATALYST AND SOLID CATALYST MODIFIED MAGNETITE TO SIMULATED MINE WATER.
TABLE Ⅸ TURBIDITY AND ITS REDUCTION RATIO BEFORE AND AFTER MAGNETIC SEPARATION OF SOLID CATALYST-MODIFIED MAGNETITE USING Fe2(SO4)3 OR FeCl3 AS A STARTING MATERIAL.
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