• Title/Summary/Keyword: Ferric oxide

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Adsorption of $\alpha$-Fe2O3 on the Surface of Mica Particles (운모표면에 대한 $\alpha$산화철 흡착)

  • 김대웅;조동희;김명숙;박면용
    • Journal of the Korean Ceramic Society
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    • v.24 no.3
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    • pp.215-222
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    • 1987
  • ${\alpha}$-Ferric Hydrous Oxide and ${\alpha}$-Ferric Oxide were obtained as following processes that Ferric Nitrate solution was adjusted to pH 6-8 with Ammonium Hydroxide, refluxed the Iron precipitate for 1 hr. at 80$^{\circ}C$, washed it with water and Methanol (95%), dried it to obtain ${\alpha}$-Ferric Hydrous Oxide at 60$^{\circ}C$, and then heated in atmosphere to prepare ${\alpha}$-Ferric Oxide for 1 hr. at 450$^{\circ}C$. Mica particles cleaned with ultrasonicator (45KHz) in water were mixed with Ferric Nitrate solution and treated it to adsorb ${\alpha}$-Ferric Oxide on the surface of mica particles by using the abovementioned processes, but the heated temperature was at 500$^{\circ}C$. The maximum wavelength of reflected light on the surface of mica-${\alpha}$-Ferric Oxide (50%) was appeared at 546nm but -Ferric Oxide free mica only was at 436 nm. The maximum wavelength was shifted to longer when the weight ratios of ${\alpha}$-Ferric Oxide to mica was changed from 1% to 50%.

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A Study on the Manufacture of $\alpha$-Fe$_2$O (Major Material of Ferrite) by Waste Pickling Liquor of Steel (강철의 산세폐액으로부터 Ferrite의 주원료인 Fe$_3$O$_3$의 제조에 관한 연구)

  • 최석진
    • Journal of the Korean Ceramic Society
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    • v.13 no.1
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    • pp.25-29
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    • 1976
  • The properties vary with quality of ferric-oxide that is major material of ferrites. In this point of view, a manufacturing method of pure and homogeneous fine ferric oxide is very important. The characters of this study are as follows: 1) Ferric oxide was made from waste pickling liquor of steel. 2) The crude ferric-oxide that is made by roasting the pickling liquor was dissolved in 20% HCI solution and then produced ferric chloride is purified by ethyl ether extraction. 3) The methanol solution of purified ferric chloride was sprayed into the refractory tube with compressed air and propane gas and then ignited leading to the ferric-oxide powder. 4) The produced oxide powder was introduced to the scrubber type vessel throught cooling system in order to collect the powder. 5) Crystalline phase of the powder was identified by X-ray diffraction and particle size, crystalline shape of the powder were investigated by settling method and electron microscope and the effects of concentration of ferric chloride in methanol on grain size were discussed. Results were obtained as fellows: 1) Total impurity in the ferric oxide produced from waste pickling liquor was 3.7%. 2) The solubilityof crude ferric oxide that was made from waste pickling liquor in HCI solution increased with the HCI concentration and reached to saturation range at 15% HCI concentration. 3) Extraction of FeCl3 increased with HCI concentration which is solvent. 4) Alpha ferric oxide obtained was very fine crystalline particles, the mean crystalline grain increased with the concentration of ferric chloride, and mean grain size distributed from 3.5$\mu$(at 0.5mole/l) to 0.5$\mu$(at 0.05mole/l).

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Magnetism of Ferric Iron Oxide and Its Significance in Martian Lithosphere (화성 암권의 진화해석을 위한 예비연구: 3가철 산화물의 자화특성)

  • Jeong, Doo-Hee;Yu, Yong-Jae
    • Journal of the Mineralogical Society of Korea
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    • v.24 no.3
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    • pp.189-194
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    • 2011
  • Martian satellite missions indicate that Martian equatorial plains are covered by ferric iron oxide. As a non-destructive technique, low-temperature treatment of remanent magnetization is effective in identifying magnetic minerals in rocks. In the present study, four sets of ferric iron oxides were prepared by aqueous alteration of ferrihydrite at warm conditions and four others by dehydration of goethite. As the amount of aluminous trivalent cations increases, crystallographic lattice parameters and N$\acute{e}$el temperatures decrease. Such declines originate from lattice distortion as the smaller aluminous trivalent cations substitue the larger terric irons. Whilst high remanence memory was observed for aqueously produced ferric iron oxide, low remanence memory was observed for dehydrated ferric iron oxide. In the future. magnetic remanence memory would be powerful in diagnosing the origin of ferric iron oxide.

High Purity Ferric Oxide : Origin of Impurities and IROX-NKK Purification Process

  • Maeda, T.
    • Resources Recycling
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    • v.11 no.5
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    • pp.21-23
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    • 2002
  • A new process based on the co-precipitation method was developed fer removing harmful impurities during Mn-Zn ferrite production such as $SiO_2$ and P from waste pickle liquor. By this process a final result of less than 100 ppm of $SiO_2$ and less than 10 ppm of P content in the ferric oxide is easily attained. Though Ca cannot be removed by this process, water rinsing of the ferric oxide is effective fer reducing Ca content to less than 100 pm. For further purification, the origins of each impurity must be investigated and then taken away.

Experimental Studies on the Effects of Ferric Oxide (철액수(鐵液水)의 효능(效能)에 관(關)한 실험적(實驗的) 연구(然究))

  • Jang, Hyun Jin
    • Journal of Sasang Constitutional Medicine
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    • v.3 no.1
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    • pp.173-183
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    • 1991
  • These studies were conducted about the effects of Ferric oxide in the aspect of the basic pharmacology through experimental animals with the investigation of its clinical effects on oriental medical literatures of Ferric oxide. The results were as follows: 1. The analgenic effects induced by acetic acid were significant. 2. The anticonvulsive effects induced by ECT unit were significant. 3. The sedative effects in Rotor rod method were significant. 4. The number of platelets was increased but not significantly. 5. Prothrombin time was decreased significantly. 6. Fibrinogen was increased but not significantly. 7. The degree of concentration of FDP was decreased significantly. According to the above results, it is considered that Ferric oxide retains effectiveness on the treatment of cerebral stroke.

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Experimental Simulation of Iron Oxide Formation on Low Alloy Steel Evaporator Tubes for Power Plant in the Presence of Iron Ions

  • Choi, Mi-Hwa;Rhee, Choong-Kyun
    • Bulletin of the Korean Chemical Society
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    • v.30 no.11
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    • pp.2577-2583
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    • 2009
  • Presented are the formation of iron oxide layers on evaporator tubes in an actual fossil power plant operated under all volatile treatment (AVT) condition and an experimental simulation of iron oxide formation in the presence of ferrous and ferric ions. After actual operations for 12781 and 36326 hr in the power plant, two iron oxide layers of magnetite on the evaporator tubes were found: a continuous inner layer and a porous outer layer. The experimental simulation (i.e., artificial corrosion in the presence of ferrous and ferric ions at 100 ppm level for 100 hr) reveals that ferrous ions turn the continuous inner oxide layer on tube metal to cracks and pores, while ferric ions facilitate the production of porous outer oxide layer consisting of large crystallites. Based on a comparison of the oxide layers produced in the experimental simulation with those observed on the actually used tubes, we propose possible routes for oxid layer formation schematically. In addition, the limits of the proposed corrosion routes are discussed in detail.

Standard of Hwangtoh Pack Product (황토팩 제품의 규격)

  • Sohn, Young-Taek
    • Journal of Pharmaceutical Investigation
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    • v.35 no.6
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    • pp.467-469
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    • 2005
  • The purpose of this study was to investigate main ingredients of Hwangtoh (Korean yellow ochre), especially ferric oxide $(Fe_{2}O_{3})$ content. In this study, X-ray fluorescence spectrophotometry was employed to analyze the ingredients of Hwangtoh. The ferric oxide $(Fe_{2}O_{3})$ contents of Hwangtoh from Hwa Sun, Ham An, Chil Gok, Sun Chun, Ha Dong, San Chung, Go Chang, Kim Che and Jeong Eup were 1.5, 5.66, 11.76, 6.63, 2.74, 11.4, 4.84, 7.21 and 6.23%, respectively. Based on the above results, any Hwangtoh sample didn't meet the ferric oxide $(Fe_{2}O_{3})$ content criterion.

Improvement of biosand filter embedded with ferric-manganese-silica oxide adsorbent to remove arsenic in the developing countries (개발도상국에서 Hybrid Ferric-Manganese-Silica Oxide를 적용한 비소 제거용 정수 BSFilter 적정기술개발)

  • Jeong, Ingyu;Dockko, Seok
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.5
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    • pp.641-648
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    • 2013
  • Arsenic (As) contamination in drinking water is severe problem for about 100 million people who live in Bangladesh, Cambodia, Nepal, India, Vietnam, Myanmar, Mongolia, and Ethiopia etc. Chronic doses cause skin cancer, blackfoot disease, and cardiac damage. Even though the biosand filter (BSF) is popular in many developing countries, it could not remove effectively hazardous ions as As. Adsorbent is effective and feasible to reduce As. In this study the improved biosand filter (iBSF) was embedded with adsorbent, was tested to evaluate As removal as well as organic removal. In 20 days removal of turbidity, bacteria, and $UV_{254}$ have shown 60-95 % removal. Arsenic was removed more than 99.9 % in the columns embedded with silica oxides of ferric manganese ($FM{\alpha}$) while 5.8 ~ 38.3 % in columns without $FM{\alpha}$. Isotherm test showed that average amount of the adsorbed arsenic on the oxides was 0.56 mg/G.

Synthesis of Iron Oxide Using Ferrous and Ferric Sulfate (황산제일철과 황산제이철을 이용한 산화철 합성)

  • Eom, Tae-Hyoung;Tuan, Huynh Thanh;Kim, Sam-Joong;Suh, Dong-Soo
    • Korean Journal of Materials Research
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    • v.20 no.6
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    • pp.301-306
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    • 2010
  • The chemical formula of magnetite ($Fe_3O_4$) is $FeO{\cdot}Fe_2O_3$, t magnetite being composed of divalent ferrous ion and trivalent ferric ion. In this study, the influence of the coexistence of ferrous and ferric ion on the formation of iron oxide was investigated. The effect of the co-precipitation parameters (equivalent ratio and reaction temperature) on the formation of iron oxide was investigated using ferric sulfate, ferrous sulfate and ammonia. The equivalent ratio was varied from 0.1 to 3.0 and the reaction temperature was varied from 25 to 75. The concentration of the three starting solutions was 0.01mole. Jarosite was formed when equivalent ratios were 0.1-0.25 and jarosite, goethite, magnetite were formed when equivalent ratios were 0.25-0.6. Single-phase magnetite was formed when the equivalent ratio was above 0.65. The crystallite size and median particle size of the magnetite decreased when the equivalent ratio was increased from 0.65 to 3.0. However, the crystallite size and median particle size of the magnetite increased when the reaction temperature was increased from $25^{\circ}C$ to $75^{\circ}C$. When ferric and ferrous sulfates were used together, the synthetic conditions to get single phase magnetite became simpler than when ferrous sulfate was used alone because of the co-existence of $Fe^{2+}$ and $Fe^{3+}$ in the solution.