Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Fundamental study on sustainable treatment system of mine water using magnetized solid catalyst

  • Received : 2019.01.21
  • Accepted : 2019.03.16
  • Published : 2019.06.30
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Abstract

In the mine exploration sites, sustainable treatment system of mine water with energy saving and minimized chemical additives is required. Since most of the mine water contains highly-concentrated ferrous ion, it is necessary to study on the removal method of iron ions. We propose the system consisting of two processes; precipitation process by air oxidation using solid catalyst-modified magnetite and separation process combining gravitational sedimentation and magnetic separation using a permanent magnet. Firstly, in the precipitation process (a former process of the system), we succeeded to prepare solid catalyst-modified magnetite. Air oxidation using solid catalyst-modified magnetite using $Fe_2(SO_4)_3$ as a starting material showed high iron removal capability. Secondly, in the separation process (latter process of the system), solid catalyst-modified magnetite using $Fe_2(SO_4)_3$ as a starting material can be separated by a superconducting bulk magnet and a permanent magnet.

Keywords

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Fig. 1. The proposed system of mine water treatment.

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Fig. 2. The mechanism of iron removal using solid catalyst.

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Fig. 3. Iron ion concentration before and after air oxidation for each Fe(OH)3.

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Fig. 4. FT-IR spectra of solid catalyst, magnetite and solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material.

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Fig. 5. FT-IR spectra of solid catalyst, magnetite and solid catalyst-modified magnetite using FeCl3 as a starting material.

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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.)

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Fig. 7. Potentiometric titration of distilled water, pure magnetite and pure solid catalyst (Fe2(SO4)3 or FeCl3 as a starting material).

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Fig. 8. The flow of the separation process of mine water.

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Fig. 9. Suspension before and after sedimentation for 30 minutes.

TABLE Ⅰ COMPARISON OF EXISTING MINE WATER PURIFICATION METHODS.

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TABLE Ⅱ EXPERIMENTAL CONDITIONS OF AIR OXIDATION USING SOLID CATALYSTS.

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TABLE Ⅲ MAGNETIC SUSCEPTIBILITY AND PARTICLE SIZE OF SOLID CATALYST.

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TABLE Ⅳ THE RESULT OF WEIGHT MEASUREMENT.

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TABLE Ⅴ THE RESULT OF PARTICLE SIZE.

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TABLE Ⅵ EXPERIMENTAL CONDITION OF AIR OXIDATION USING SOLID CATALYST-MODIFIED MAGNETITE.

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TABLE Ⅶ THE REMOVAL RATIO OF IRON ION USING MAGNETITE, SOLID CATALYST AND SOLID CATALYST-MODIFIED MAGNETITE.

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TABLE Ⅷ pH CHANGE IN SOLID CATALYST AND SOLID CATALYST MODIFIED MAGNETITE TO SIMULATED MINE WATER.

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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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