• Feed Journal
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• v.4 no.9 s.37
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• pp.40-45
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• 2006

• KOREAN POULTRY JOURNAL
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• v.38 no.7 s.441
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• pp.188-194
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• 2006

풍전부화장-임직원 승진인사 단행/ (주)한펠-고객감사초청세미나 개최 및 승진인사/ (주)마광-영업 및 기타부서 사원 영입/ 우진비엔지(주)-보건복지부장관 표창 수상/ 서울사료(주)-하절기 제품 강화를 통한 대농가 서비스/ 바이엘코리아-곰팡이독소 세미나 개최/ (주)삼양애니팜-품질향상을 위한 주사제 생산시설 교체/ 서부사료-창립37주년 기념행사 개최 및 직원채용/ (주)애그리브랜드 퓨리나코리아-40주년 창립기념식 및 사업전진대회 개최/ (주)경축-창립 36주년 기념 자연보호 행사 개최/ 네오바이오(주)-링거 솔루션 '하이드로솔' 출시/ (주)파루-파리유인제 '파리팡' 출시/ 해훈케미칼(주)-친환경 '파리' 스프레이 유인포충제 '터치킬라-에스' 양계업계 관심집중/ 동부한농-신제푼 넉다운-P, 수퍼킬 출시, 연막·분무 모두 가능한 친환경 살충제 "넉다운-P", 효과 빠른 파리전용 유인 살충제 "수퍼킬"

• Resources Recycling
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• v.2 no.2
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• pp.27-38
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• 1993

In this study, we investigated the grinding and sedimentation(elutriation) process of the dusts for the effective separation of high purity iron and iron oxides. For characterization of the dust, particle size distribution and chemical composition, were examined. The results obtained in this study may be summarized as follows : 1. The converter CF(clarifier) dust of the Pohang 1st, 2nd steel making factory and EC(Evaporation Cooler), EP(Eltrostatic precititator) dust of the Kwangyang 2nd steel making factory are composed $\alpha$-Fe(21~50%), FeO(wustite)$Fe_3$$O_4$(magnetite), $Fe_2$$O_3$, CaO, $Al_2$$O_3$, $SiO_2$, and etc. 2. Pure iron has ductile characteristic in nature, particle size of the pure iron increase by increasing the grinding time. On the other hand, it is conformed that bo고 particles of hematite and magnetite become less than 325 mesh after 10 minutes grinding. 3. By applying the elutriation technique for the EC dust of the Kwangyang 2nd steel making factory, the iron powder of high content more than 99.17% of pure Fe was recovered with 37.8% yield at grinding time for 40 minutes. 4. By applying the elutriation technique for the CF dust of the Pohang 2nd steel making factory, the iron powder of high content more than 98.38% of pure Fe was recovered with 44.42% yield at grinding time for 40 minutes. 5. When magnetic separation was performed using plastic bonding magnet of 70 gauss, more than 98% Fe grade of iron powder was recovered in the size range +65 -200 mesh but the recovery of it was low.

• Resources Recycling
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• v.19 no.2
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• pp.35-44
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• 2010

As the competition of acquiring foreign resources of advanced countries and developing countries intensifies, South Korea which imports most of the mineral resources, started to re-develop domestic mines for molybdenite ore, in order to secure stable natural resources and decrease foreign currency expense. In this study, as a result of performing XRD and composite analysis on Dongwon NMC's (the sole producer of molybdenite ore in Korea) final concentrate(Mo 50.4%), Quartz, Grossular and Hedenbergite exists as impurities and size analysis showed that in relative coarse particle range of 60~140 mesh was formed with high grade over 57% Mo. Also, a test was performed to confirm the possibilities of increasing the grade and recovery of Dong won NMC's final ore. As a result, Mo 58.6% ($MoS_2$ 97.83%) was obtained with 87.47% recovery at a condition of 15 minutes grinding time, Kerosene as collector 0.1 l/ton, AF as Frother 65 7.2 l/ton, wash water of 630 ml/min and air flow rate of 1,197 ml/min.