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저품위 동광으로부터 습식제련공정에 의한 구리의 분리 공정 연구
신동주,주성호,이동석,전호석,신선명,Shin, Dong Ju,Joo, Sung-Ho,Lee, Dongseok,Jeon, Ho-Seok,Shin, Shun Myung 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.5
In this study, we attempted to separate and recover Cu from low-grade copper ore by a hydrometallurgical process. The leaching sample obtained after crushing and sieving by 0.355 mm of low-grade copper ore contained 1.5% Cu, 4.7% Fe, 1.0% Mn, and 0.3% Zn. The Cu in the oxide ore was very well leached into sulfuric acid and 97% Cu leaching efficiency was achieved at 80℃ and 3 M sulfuric acid (H<sub>2</sub>SO<sub>4</sub>). From the leaching solution, Cu was separated by solvent extraction from Fe, Mn, and Zn using LIX984N. The separation tendency between Cu and other metals was confirmed through the distribution ratio and separation factor. By plotting the McCabe-Thiele Diagram, the optimum condition for recovering Cu is 5 vol.% LIX984N, 2-stage counter-current solvent extraction, and an O/A ratio of 0.5. Using this method, 99% of the Cu was extracted and a CuSO<sub>4</sub> solution was finally obtained that contained 1.6 g/L Cu after the stripping process using 2 M H<sub>2</sub>SO<sub>4</sub>.
국내산 함바나듐 티탄자철광으로부터 CaO 배소를 통한 바나듐 침출거동
신동주,주성호,이동석,전호석,신선명,Shin, Dong Ju,Joo, Sung-Ho,Lee, Dongseok,Jeon, Ho-Seok,Shin, Shun Myung 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.4
In this study, the leaching behavior of vanadium (V) was investigated through CaO roasting and sulfuric acid leaching from domestic V-bearing titanomagnetite (VTM). Changes in the phase according to the amount of CaO added and roasting temperature were analyzed. Regardless of the roasting conditions, perovskite (CaTiO<sub>3</sub>) was preferred to form. When the CaO content was increased, the calcium ferrite (CaFeO<sub>x</sub>) phase was formed; otherwise, ferrite (Fe<sub>2</sub>O<sub>3</sub>) was preferred. After CaO was roasted, leaching was performed for 6 h with 1M sulfuric acid at 50℃ and a 10% solid-liquid ratio. Results of leaching revealed that when the roasted product was sintered, V was not sufficiently oxidized, and the leaching efficiency decreased. In addition, when the roasting temperature was low, the leaching efficiency of V decreased due to the influence of unreacted excess CaO. To lower the leaching efficiency of iron and titanium in VTM concentrates, suppressing the formation of CaTiO<sub>3</sub> and CaFeO<sub>x</sub> was necessary by minimizing the amount of CaO added. Consequently, a leaching efficiency of 86% V, 4.3% Fe, and 6.5% Ti was obtained when the roasted product of 1150℃ and 10 wt% CaO was leached.
Halofuginone 국소 도포가 피부 창상 치유에 미치는 영향
신동주(Dong Ju Shin),김도원(Do Won Kim),이석종(Seok Jong Lee),김정철(Jung Chul Kim) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.3
N/A Background:During normal wound healing the formation of scars and fibrous tissue occurs, which consists largely of collagen fibril, but excessive fibrosis and scar formation become clinical problems. Collagen remodelling during scar formation is dependent on both continued collagen synthesis and collagen catabolism. Halofuginone, a plant alkaloid, is known to inhibit collagen type I synthesis at the transcriptional level. Objective:The purposes of this study were to investigate the effects of topical application of halofuginone on the healing of wounds. Method:Topical solutions containing halofuginone of variable concentrations were applied on the full-thickness excisional wounds of hairless mice and 0.1% halofuginone ointments applied on the suture site of rats and the normal skin of hairless mice daily. In addition, we performed a one-time intradermal injection of 0.1% halofuginone solution on the normal skin of the hairless mice. We examined the collagen content of the skin of hairless mice and rats treated with halofuginone solutions and ointments during the healing process by performing hematoxylin-eosin and Masson's trichrome stains. We assessed, from time to time, the change in the full-thickness excisional wound size of hairless mice treated with halofuginone solutions of variable concentrations during the healing process and observed clinically the healing process of hairless mice with the full-thickness excisional wound. Result: 1. The wound size after daily application of 0.001% and 0.1% halofuginone solutions on the full-thickness excisional wounds of hairless mice decreased more slowly in comparison with the control group(p<0.05). (Korean J Dermatol 2000;38(3):305~313)
증례 보고 : 요골 원위부 골절의 수장 금속판 고정술 후 근위부 나사못에서 발생한 장무지 신전건 파열 -증례 보고-
신동주 ( Dong Ju Shin ),남승오 ( Seung Oh Nam ),조훈식 ( Hun Sik Cho ) 대한골절학회 2013 대한골절학회지 Vol.26 No.4
요골 원위부 골절에서 수장 금속판 고정술 후 돌출된 원위부의 나사못에 의해 발생한 장무지 신전건 파열에 관한 보고는 증가하고 있다. 그러나 저자들은 국내외 보고가 매우 드문 근위부 나사못의 돌출부에서 발생한 장무지 신전건 파열 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. As volar plate fixation of distal radius fracture becomes more common, reports of ruptured extensor pollicis longus tendon by a protruding distal screw tip are also increasing steadily. Authors have experienced a rare case of ruptured extensor pollicis longus tendon at the prominent proximal screw of fixed volar plate for distal radius fracture, and we report it herein with a review of the literature.
신동주 ( Dong Ju Shin ),변영수 ( Young Soo Byun ),장세앙 ( Se Ang Chang ),박옥랑 ( Ok Rang Park ),김신윤 ( Shin Yoon Kim ),황대희 ( Dae Hee Hwang ),이성락 ( Sung Rak Lee ),김동영 ( Dong Young Kim ) 대한골절학회 2006 대한골절학회지 Vol.19 No.4
목적: 분만과 관련한 치골 결합 분리의 임상적 특징 및 발병률을 알아보고 정상군과의 비교를 통하여 위험인자를 확인하며 치료결과를 분석하였다. 대상 및 방법: 1992년 1월부터 2004년 12월까지 66,721명의 분만 중, 치골 결합 분리로 진단된 72명을 대상으로 하였다. 치골 결합부 분리 증상이 없었던 산모 498명을 대조군으로 정하고 χ2-검사와 Student t-검사를 사용하여 위험인자를 분석하였고, 최종 추시에서 방사선학적 평가와 Majeed의 방법을 이용한 기능적 평가를 하였다. 결과: 치골 분리의 간격은 평균 13.8 mm (범위, 6∼43)이고 최종 추시상 평균 4.9 mm (범위, 3∼16)였으며 증상의 발현은 분만 중에서부터 분만 후 3일까지 다양한 시기에 나타났다. 발병률은 927명 중 1명이었고 통계학적 검증을 통하여 신생아의 체중, 분만 2기의 지연, 분만 시 흡인기의 사용이 위험인자로 확인되었다. 최종 추시된 63명 중 우수 52예 (82.5%), 양호 9예 (14.3%), 보통 2예 (3.2%)였다. 결론: 분만에 의한 치골 결합의 분리는 태아의 체중이 많이 나가는 경우, 분만 2기가 지연되는 경우, 분만 시 흡인기가 필요한 경우 위험성이 증가하였다. 최종 추시 상 다양한 방사선학적 결과에도 불구하고 보존적 치료로 좋은 결과를 얻을 수 있었다. Purpose: To evaluate the clinical features and incidence of separation of the symphysis pubis during childbirth, and to evaluate the risk factors of the lesion and the outcome of treatment. Materials and Methods: Seventy two cases of separation of symphysis pubis among 66,721 delivery between January 1992 and December 2004 was selected. The control group was composed of 498 cases without separation of symphysis pubis during childbirth. Several factors increasing the risk of this lesion were assessed using x2-test and Student t-test. The final outcome was evaluated on radiographs and the grading system of Majeed. Results: Mean width of the joint was initially 13.8 mm (range, 6∼43) and finally 4.9 mm (range, 3∼16). Onset of symptoms occurred variably from labor to postpartum day 3. Incidence of separation of symphysis pubis was one among 927 deliveries. The separation group differed significantly from the control with respect to birth weight, the prolonged 2nd stage of labor, and the use of vacuum-delivery. Of 63 cases at final, 52 cases (82.5%) had excellent result, 9 (14.3%) had good and 2 (3.2%) had fair. Conclusion: The result showed that high birth weight, the prolonged second stage of labor and vacuum-delivery were risk factors of separation of the symphysis pubis during childbirth. This lesion was treated well with conservative methods, although variable radiological findings were noted at final follow-up.
신동주(Dong-Ju Shin),권기태(Ki Tae Kwon),허동명(Dong-Myeong Huh),김지환(Ji-Hwan Kim),박재영(Jae-young Park),이충열(Chung-Yeol Lee) 대한견주관절의학회 2010 대한견주관절의학회지 Vol.13 No.1
목적: 감염성 심내막염과 동반된 견관절 화농성 관절염의 치료 경험을 보고하고자 한다. 대상 및 방법: 감염성 심내막염에 동반한 화농성 견관절염을 가진 70세 남자 환자에 대하여 심장 판막 치환술 및 관절경하 활막 절제술과 배농술을 시행 하였다. 결과: 감염에 대한 순조로운 치유와 기능의 회복을 보였다. 결론: 상대적으로 견관절에 화농성 관절염이 동반되는 경우는 매우 드문 것으로 보고 되고 있으나 감염성 심내막염에 동반하는 일반적인 근골격계 증상으로 간과한다면 심각한 합병증으로 발생할 수 있음으로 주의 깊게 판단하여야 한다고 생각한다. Purpose: We report a case of pyogenic arthritis of the shoulder secondary to infective endocarditis. Materials and Methods: A 70 year-old male who had suffered from pyogenic arthritis of the left shoulder secondary to infective endocarditis was treated with artificial valvuloplasty, arthroscopic synovectomy and drainage. Results: Infection was cured and the patient achieved a good functional outcome. Conclusion: Pyogenic arthritis of the shoulder is rarely associated with infective endocarditis. However, if the symptoms are misdiagnosed as musculoskeletal symptoms associated with infective endocarditis, serious complications may arise. As such, musculoskeletal symptoms associated with infective endocarditis should be paid careful attention.
신동주(Dong-Ju Shin),남승오(Seung-Oh Nam),김태은(Tae-Eun Kim),박기홍(Ki-Hong Park) 대한정형외과학회 2015 대한정형외과학회지 Vol.50 No.1
견관절의 극상근 내 침윤성 근육 내 지방종은 극히 드문 증례로 저자들은 극상건의 부분 파열이 동반된 극상근 내 침윤성 지방종 환자에 대해 수술적 제거 및 회전근개의 봉합술을 시행하였고, 1년 추시 자기공명영상 결과상에서도 만족스러운 결과를 얻어 이에 대한 문헌 고찰과 함께 보고하고자 한다. Infiltrating lipoma in supraspinatus muscle on the shoulder is very rare. We performed open excision and rotator cuff repair on a patient who had infiltrating lipoma in supraspinatus muscle with partial tear of the supraspinatus tendon. We achieved a satisfactory outcome on one-year follow-up magnetic resonance imaging. We report on the case with a review of the literature.