호주산 저품위 동광의 부유선별에 관한 특성조사

김준수,김우진,황하,김명준,김완태,Kim, Joon Soo,Kim, Woo Jin,Hwang, Ha,Kim, Myong Jun,Kim, Wantae 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.6

본 연구의 목적은 호주산 저품위 동광을 부유선별하여 정광으로 회수하고자 할 때, 최적의 부유선별 조건을 얻고자 하는데 있다. 본 연구에서는 저품위 동광의 파분쇄 및 분급에 의해 선별에 적절한 입자크기의 시료를 얻은 다음, 이를 대상으로 부유선별 시 포수제, 활성제, 억제제의 첨가량 및 광액의 pH 변화가 부선효율에 미치는 영향을 조사함으로써 품위가 향상된 정광을 얻고자 하였다. 본 연구실험결과 얻은 최적의 부유선별 조건은 광액산도 pH9.0, 활성제 500 g/t $CuSO_4{\cdot}5H_2O$, 포수제 500 g/t K.E.X, 억제제 1500 g/t $Na_2SO_3$, 광액농도는 25 wt.% 이었다. 최적조건하에서 얻은 정광중의 동 품위 및 회수율은 각각 4 wt.%와 65 wt.% 정도이었고 대부분 철 성분을 함유한 광물 이었다. The purpose of this study is to obtain an optimum condition of the concentrate by floatation using Australian low grade copper ore of suitable particle size by crushing, grinding and sizing. The effect of the dosage of collector, activator, depressant and change of acidity on the floatation was investigated. The floatation conditions comprising of pH 9.0 acidity, 500g/t $CuSO_4{\cdot}5H_2O$ activator, 500g/t K.E.X. collector, 1500g/t $Na_2SO_3$ depressant and 25wt.% plup density were optimized. Grade and recovery of copper in the concentrate obtained by froth floatation under optimum conditions were 4wt.% and 65wt.% respectively.

홍천산 모나자이트의 가성소다 분해 및 침출

김준수,윤호성,김성돈,김철주,이진영,Kim Joon-Soo,Yoon Ho-Sung,Kim Sung-Don,Kim Chul-Joo,Lee Jin-Young 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.4

본 연구에서는 국내 홍천산 모나자이트 정광의 가성소다 분해 및 분해산물의 염산 침출에 대한 처리조건을 확립하고자 하였다. 분해 반응의 조건은 입자크기의 -200 mesh 이하이면 적절하였고, 반응온도 $460^{\circ}C$부근에서 원활한 분해가 이루어 졌으며, 가성소다 첨가량은 NaOH/TREO mole ratio 6정도가 효과적이다. 또한 침출반응의 조건은 염산농도 8N 및 반응온도 $80^{\circ}C$이상이 침출에 적절하였으며, 반응시간 2시간 및 광액 농도 10%가 효과적이다. 그리고 최적조건하에서 모나자이트의 분해 침출율은 90%이상이였고, 부산물 형태로 인산소다 화합물은 효과적으로 회수하였으며, 희토류 원소별 분리에 적합한 시료용액을 조제하였다. In this study, treatment conditions for monazite concentrate in Hong-Cheon area deposit were studied with NaOH fritting decomposition and HCl leaching experiments. At condition of NaOH fritting decomposition, it was appropriate to adopt particle size of -200 mesh monazite, reaction temperature of about $460^{\circ}C$ and NaOH/TREO mole ratio of 6. In case of HCl leaching for decomposed product, it was appropriate to use hydrochloric acid of above 8N with leaching temperature of above $80^{\circ}C$, leaching time of 2 hrs and pulp density of about 10%. A rate of decomposition and leaching for monazite was above 90% under optimum conditions. Sodium phosphate compound was effectively recovered from NaOH decomposed solution, and mixed rare earth chloride solution was prepared with HCl leaching of decomposed product.

쿠싱병에 대한 경접형동접근법의 내분비학적 결과

김준수,김창진,하상수,김정훈,이정교,권병덕,홍성관,이기업,이봉재,김용재,최충곤,이호규,Kim, Joon Soo,Kim, Chang Jin,Ha, Sang Soo,Kim, Jung Hoon,Lee, Jung Gyo,Kwun, Byung Duk,Hong, Sung Kwan,Lee, Ki Up,Lee, Bong Jae,Kim, Yong Jae,Choi, Choo 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.5

Objective : We analyzed the clinical and endocrinological results of the transsphenoidal microsurgery for ACTH secreting pituitary adenomas. Marerials and Methods : From October 1995 to August 2000, 18 patients underwent transsphenoidal microsurgery for Cushing's disease. We analyzed the surgical results of 17 patients, one patient who was previously operated from other hospital was excluded. Age of the patients were 18 to 61 years old(mean 37.7), male to female ratio was 1 : 3.3, and follow-up period was 3 to 50 months(mean 20.3). The selection of candidates for transsphenoidal exploration was based on endocrinologic criteria. Magnetic resonance imaging was the preferred radiologic test. Selective inferior petrosal sinus sampling of adrenocorticotropic hormone futher refined the diagnosis when endocrinologic and radiologic procedures were not definitive. Results : Results of the preoperative endocrinological test were : level of serum ACTH 29.4 to $225{\mu}g/dL$(mean $93.88{\mu}g/dL$) ; serum cortisol 11.9 to $47.5{\mu}g/dL$(mean $27.49{\mu}g/dL$) ; 24-hour urine free cortisol 235 to $1019{\mu}g/day$(mean $571.0{\mu}g/day$). Inferior petrosal sinus sampling for ACTH was performed in 11 patients and all were confirmed by Cushing's disease and we could predict the laterality of the tumor in 9 of 11 patients. We performed transsphenoidal selective adenomectomy in 5 patients, adenomectomy and subtotal hypophysectomy in 2 patients, adenomectomy and partial hypophysectomy in 9 patients, and in the remaining one patient, hemihypophysectomy followed by total hypophysectomy due to remission failure. Fifteen of 17 patients(88.2%) showed endocrinological remission. Glucocorticoid replacement therapy was performed in all the patients who showed remission for 1 to 24 months(mean 5.9 months), and 6 patients received steroid over 6 months. Conclusion : We conclude that the direct demonstration of a tumor in the pituitary gland by MRI is the most important and definitive diagnostic tool and the location of a mass should be confirmed with increased level of ACTH by the inferior petrosal sinus sampling. Transsphenoidal microsurgery is effective treatment modality for Cushing's disease and the immediate postoperative evaluation of the surgical resection of the tumor is very important. The patients should show hypocortisolism, decreased, subnormal serum ACTH and cortisol levels and 24-hours urine free cortisol. We performed 18 transsphenoidal microsurgery for Cushing's disease in 17 patients and 15 patients(88.2%) showed endocrinological remission.

Ilmenite의 炭素還元에 의한 $TiO_2$ 品位 向上 硏究

김준수,김성돈,박형규,Kim, Joon-Soo,Kim, Sung-Don,Park, Hyung-Kyu,Sohn, Hong-Yong 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.5

본 연구는 탄소 환원반응을 이용하여 ilmenite 중 $TiO_2$의 품위 향상을 목적으로 ilmenite 중에 존재하는 철산화물의 탄소환원에 가장 효과적인 첨가물과 최적조건을 검토하였다. Ilmenite 중 철산화물의 환원에 가장 적절한 환원제의 종류 및 첨가량은 $FeCl_3$로서 ilmenite 시료무게의 2 wt.%이었고, 또한 최적의 탄소환원제 양은 당량비로 2배였다. 그리고 적절한 환원온도 및 시간은 $1100^{\circ}C$ 부근으로서 대부분 철산화물의 환원반응이 종료되는 30분 정도로 조사되었다. 이와 같은 조건하에서 얻어진 환원반응 생성물은 자력선별 공정을 거치면 rutile의 대체 자원으로 사용이 가능함을 확인하였다. It has been carried our for establishing the methodology to upgrade $TiO_2$ by carbothermal reduction of iron oxide in ilmenite. Based on present experimental results, the possibility for substitution with rutile has been investigated. It could by proposed that the 2 wt.% $FeCl_3$ of sample and carbon of 2 equivalents are optimum conditions as a feeding materials. And also appropriate reducing temperature and reduction time were about $1100^{\circ}C$ and 30 minutes. The product obtained by the processes of carbon reduction and magnetic separation may be used the substitute mineral of rutile.

SiC 휘스커로 강화한 6061 Al 합금 복합재료의 기계적 특성에 미치는 열간압출의 영향

김준수,임수근 ( Jun Su Kim,Su Geun Lim ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.2

N/A Both cast and extruded composites of SiC whisker reinforced 6061 Al alloy matrix were fabricated by high pressure infiltration of the alloy melt into the SiC preform and subsequent hot extrusion of the composite ingots. The micro structures, age hardening behavior and mechanical properties have been examined on the both cast and extruded composites of SiCw/6061. The cast composites of SiCw/6061 were obtained in which SiC whiskers were randomly oriented. Hot extrusion of these cast composites lead to alignment of the whisker in the direction of extrusion. Strengthening effect of whisker in the extruded composites is lower than that of the cast composites. The cast composites of SiCw/6061 showed higher thensile strength and lower elongation than extruded composites of SiCw/6061 at all testing temperatures. Lower tensile strength and higher elongation of the extruded composites were attributable to fine grain structures in which grain boundary sliding occurred preferentially at elevated temperatures.

건설시설물 친환경VE 의사 판단 모델 NIA 제안

김준수,김병수,Kim, Joon-Soo,Kim, Byung-Soo 대한토목학회 2015 대한토목학회논문집 Vol.35 No.6

우리나라 경제성장의 핵심 원동력이었던 건설업은 오늘날 환경부하량 배출이 가장 많은 산업으로 류되고 있다. 이에 건설업은 친환경을 실현하고자 많은 노력을 기울였지만 그 효과는 미비한 실정이다. 본 연구는 사업 초기단계에서 친환경 VE가 적용이 가능하면 건설업의 친환경 효과가 클 것이라 판단되기에 발주자의 친환경 VE 의사를 파악 할 수 있는 NIA 모델을 개발 후 시뮬레이션 하였다. 경북북부권 환경에너지 종합타운 조성 민간사업의 제안 보고서를 기반으로 친환경 VE 의사를 묻는 20문항을 시뮬레이션 한 결과 50%의 친환경 의사가 있음을 도출 할 수 있었다. 본 연구의 결과는 친환경 VE 의사를 도출하기 위하여 설문조사를 한 후 NIA를 활용하여 건설 초기단계에서 친환경적인 설계를 위한 의사결정시 판단자료로 제공 될 수 있을 것이다. Construction industry that was the core driving force of Korean economic growth is now being classified as an industry with the largest environmental load emission. Although various efforts were made accordingly to realize eco-friendliness, its effects is insufficient currently. Based on the understanding that eco effect of construction industry would be significant if Eco VE is applicable in the initial project stage, NIA model for understanding the eco VE decision of project owner was developed with simulations in this paper. Based on the proposal report of a private project to develop the Gyeongbuk Northern Region Environmental Energy Town, 20 questions on eco VE decision were used through simulations. The result showed 50% eco-friendly decision. The result of this study can be used to provide decision-making data for eco design in the initial stage of construction by utilizing NIA upon conducting survey research to deduce eco VE decision.

세계의 Tire Cord 현황과 국산 Cord에 관하여

김준수,Kim, Jun-Su 대한타이어공업협회 1969 타이어 고무 Vol.24 No.-

Research and Development for the Recovery of Uranium and Vanadium from Korean Black Shale Ore

김준수,Kim, Joon Soo The Korean Institute of Resources Recycling 2013 資源 리싸이클링 Vol.22 No.1

This general paper covers three parts of the uranium research and development. Part one covers scope of research and development of uranium ore and future prospect, supply and demand of uranium in the world market, deposit, grade and properties of Korean uranium ore and the second part covers status of previous study and supply target for yellow cake, technology of leaching, separation and preparation, procedure of the recovery of U / V from Korean black shale ore. Final part concludes the summary of the present discussion. 본 발표는 국내 흑색 점판암으로부터 우라늄 및 바나듐 회수의 일반적인 현황 및 연구개발에 관한 내용이다. 우라늄 화합물(yellow cake)의 세계적인 수급 및 향후 전망뿐만 아니라, 국내 우라늄광의 매장량, 품위 및 특성에 대해 설명하였다. 그리고 국내 우라늄광의 기술개발에 관한 기 연구 실적 및 수행중인 연구과제의 개략적인 내용에 대해 기술하였다. 또한, 우라늄 및 바나듐 성분이 함유된 국내 흑색 점판암을 대상으로 하여 침출, 분리정제 및 회수에 관한 기술을 하였다.

세계의 Tire Cord 현황과 국산 Cord에 대하여

김준수,Kim, Jun-Su 대한타이어공업협회 1969 타이어 고무 Vol.23 No.-

고압 다이캐스트의 새로운 기술

김준수,임태원 ( Jun Su Kim,Tae Won Lim ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.3