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유가금속(有價金屬) 회수(回收)를 위한 PCB 스크랩의 건식처리기술(乾式處理技術)
신동엽,이상동,정현부,유병돈,한정환,정진기,Shin, Dong-Yeop,Lee, Sang-Dong,Jeong, Hyeon-Bu,You, Byung-Don,Han, Jeong-Whan,Jung, Jin-Ki 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.2
폐 컴퓨터나 OA기기 중 PCB (Printed Circuit Board)에는 귀금속을 포함한 많은 양의 금속성분이 함유되어 있으며, 본 연구에서는 이들을 분리회수하기 위한 건식처리 기술을 검토하였다. 폐 컴퓨터로부터 얻은 PCB 스크랩을 산화처리한 시료에 대해 정량분석을 실시하고, 함유된 산화물 종류에 대하여 적합한 슬래그계를 선정하여 유가금속을 분리회수하기 위한 산화물 성분의 슬래그화를 시도하였다. 용융작업을 위해 슈퍼칸탈 회전로를 사용하였으며, 이때 도가니 회전이 금속의 회수율에 미치는 영향을 조사하였다. It is well known that PCB (Printed Circuit Board) is a complex mixture of various metals. In this study, pyro-metallurgical process was investigated to extract valuable metallic components from the PCB scrap. PCB scrap was shredded and oxidized to remove plastic materials, and then, quantitative analysis were made. 15 mass %$Al_2O_3-45$ mass %CaO-40 mass %$SiO_2$ and 32 mass %$SiO_2-20$ mass %$Al_2O_3-38$ mass %CaO-10 mass %MgO, were chosen as basic slag compositions which are determined based on the quantitative analysis of PCB scrap. During experiments a super kanthal rotating furnace was used to melt and separate metallic components. Moreover the revolution effect on was the recovery of valuable metals from PCB scrap also investigated.
산화처리된 PCB 스크랩을 첨가한 Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-CaO 3성분계 슬래그의 점도
권의혁,한신석,지재홍,한정환,유병돈,김병수,이재천,Kwon, Eui-Hyuk,Han, Sin-Suk,Ji, Jae-Hong,Han, Jeong-Whan,You, Byung-Don,Kim, Byung-Soo,Lee, Jae-Chun 한국재료학회 2003 한국재료학회지 Vol.13 No.4
In order to explore the possibility to extract precious metals from PCB(Printed Circuit Board) scrap by gravity separation, a high temperature melting process was adopted, from the recycling view point, to investigate the influence of viscosity on A1$_2$$O_3$-CaO$-SiO_2$ slag system composed of PCB scrap. For optimizing the pre-treatment process of PCB scrap, an experimental condition for the complete calcination and oxidation of organic materials in PCB scrap was established and a quantitative analysis of oxidized PCB scrap was also carrie out. It was found that 6 hours were enough for the complete oxidation of PCB scrap at 1273 K in an atmosphere condition. A slag, l5wt%$A1_2$$O_3$-45wt%CaO-40wt%SiO$_2$, was chosen as a basic slag composition which is determined based on the quantitative analysis of PCB scrap. Viscosities were measured in slag systems both made from pure fluxes and from PCB scrap with additional fluxes. Slag viscosities composed of pure fluxes were measured to be 5.29 poise and 30.52 poise at temperatures of 1773 and 1573 K, whereas that of PCB scrap with additional fluxes were 3.37 poise and 69.89 poise, respectively.
홍성훈 ( Seong Hun Hong ),전병혁 ( Byoung Hyuk Jeon ),유병돈 ( Byung Don You ),김종덕 ( Jong Deok Kim ),장필용 ( Pill Yong Jang ),강수창 ( Soo Chang Kang ),금창훈 ( Chang Hun Geum ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.2
A fundamental study of the distillation behavior of ferromanganese alloy melts was carried out at 1773 K and 0.1333 kPa (=1 Torr). During the distillation of ferromanganese alloy melts under reduced pressure, manganese vaporizes preferentially to phosphorus and other solute elements. High purity manganese metal with a very low content of solute elements can be obtained by distillation of ferromanganese alloy melts. The evaporation of manganese is suppressed as the carbon content of ferromanganese alloy melt increases due to the decrease of activity and vapor pressure of the manganese. When the carbon content of ferromanganese alloy melt is high, melt droplets are ejected from the bath, especially in the early stages of the distillation, and the solute elements in the splashed droplets contaminate the condensed material. The ejection of melt droplets is presumed to be caused by the increase of melting temperature and viscosity of the surface layer of melt due to the enrichment of solute elements such as carbon and iron.
감압 하에서 마그네슘 합금(AM50) 스크랩 용탕의 증발 거동에 관한 연구
위창현 ( Chang Hyun Wi ),홍성훈 ( Seong Hun Hong ),유병돈 ( Byung Don You ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.3
In order to develop the vacuum distillation process of magnesium alloy scrap, a fundamental study on the evaporation behavior of magnesium alloy (AM50) scrap melt was carried out. Melt temperature, pressure, reaction time, and initial specific surface area of melt were considered as experimental variables. The evaporation rate of magnesium increased with the increase of melt temperature and initial specific surface area of melt, and with the decrease of the pressure. The activation energy of magnesium evaporation reaction calculated by an Arrhenius plot decreased with the decrease of the pressure and with the increase of the initial specific surface area of melt. An empirical equation was derived for the evaporation rate of magnesium from AM50 alloy melt.
CaO-Fe(t)O-MgO-SiO2(≤5mass%)-ΣMxOy계 슬래그의 MgO포화용해도와 용철 간 산소평형
신동엽 ( Dong Yeop Shin ),이주호 ( Joo Ho Lee ),홍성훈 ( Seong Hun Hong ),유병돈 ( Byung Don You ),서성모 ( Seong Mo Seo ),박종민 ( Jong Min Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.8
Oxygen equilibrium and the solubility of MgO have been measured in the CaO-Fe(t)O-MgO-SiO2(≤5 mass%)-ΣMxOy slag in equilibrium with liquid iron in the temperature range of 1550 to 1700℃. The effect of oxides on the MgO solubility, and a method for calculating the solubility of MgO using slag composition and temperature, were discussed. The solubility of MgO is increased with increasing temperature and Fe(t)O content, and with decreasing basicity (C/S). The effect of ΣMxOy on the solubility of MgO is a dilution effect due to the increase in slag volume. The activity and activity coefficient of Fe(t)O decreased with increasing basicity (B). The effect of temperature on the activity was negligible. The value of ρ=Fe3+/Fe2+ increased with the increase of the slag basicity (B") and the decrease of the Fe(t)O content in the slag.
홍성훈 ( Seong Hun Hong ),전병혁 ( Byoung Hyuk Jeon ),위창현 ( Chang Hyun Wi ),신동엽 ( Dong Yub Shin ),유병돈 ( Byung Don You ),서성모 ( Seong Mo Seo ),박종민 ( Jong Min Park ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.12
As a fundamental study in the development of a distillation process for ferromanganese alloy melts, the evaporation behavior of an electrolytic manganese melt under reduced pressure was investigated. The melt temperature, vacuum degree, surface area of the melt, and reaction time were considered as experimental variables. The amount of vaporized manganese increases linearly as the reaction time increases, and the evaporation of manganese was promoted by increasing the temperature and surface area of the melt. In the pressure range below the equilibrium vapor pressure of manganese, the amount of vaporized manganese per unit surface area of the melt increased sharply with a decrease of the pressure in the reaction chamber. An empirical equation for the evaporation rate of manganese was derived by regression analysis. The evaporation coefficient of manganese was determined to be approximately 3.84×10(-3) (g·K1/2)/(Pa·cm2·min) under the investigated conditions.
주성웅 ( Seong Woong Joo ),신종대 ( Jong Dae Shin ),신동경 ( Dong Kyung Shin ),홍성훈 ( Seong Hun Hong ),기준성 ( Jun Sung Ki ),황진일 ( Jin Ii Hwang ),유병돈 ( Byung Don You ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.10
The reduction behavior of low level oxides such as (T.Fe), (MnO) and (P2O5) in molten EAF slag was investigated using commercial reductants. In an air atmosphere, the slag volume increased and the reduction rate of the slag was very low due to the oxidation loss of reductants by oxygen in the air. The reduction rate of the slag was also low when a commercial reductant was used alone in an Ar gas atmosphere. The reason is probably because the material transfer through the interface between the slag and reductant is difficult due to the formation of high melting point oxide. When reductants were mixed with burnt lime in order to form low melting point reaction products, the reduction rate of the slag increased up to the range of 45-70%. By using the mixtures of reductants and burnt lime so as to form a low melting point slag at the reaction end, the reduction rate of the slag was improved up to 60-85%.
전로 제강 슬래그의 MgO 포화용해도에 대한 Al2O3의 영향
김주훈 ( Ju Hun Kim ),홍성훈 ( Seong Hun Hong ),주성웅 ( Seong Woong Joo ),신진욱 ( Jin Wook Shin ),김대현 ( Dae Hyun Kim ),최현수 ( Hyun Soo Choi ),하창수 ( Chang Soo Ha ),유병돈 ( Byung Don You ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.11
In order to investigate the feasibility of use of DRI containing a large quantity of Al2O3 in BOF steelmaking process, the solubility of MgO in BOF slag system with the Al2O3 content was studied in the temperature range of 1550 to 1650 ℃. The saturation content of MgO in the BOF slag increases linearly with the increase of the Al2O3 content due to the complex ionization of Al2O3. The MgO solubility in the slag decreases with in increase of the slag basicity and FetO content, and increases with an increase in the temperature. The effect of MnO on the MgO solubility in the slag was negligible, and MnO had a dilution effect on the slag composition due to the increase in slag volume. An index of slag composition for MgO solubility was derived by a regression analysis. An empirical equation was derived for the saturation content of MgO in slag as a fuction of the slag composition index and the temperature. (Received January 13, 2014)
김주훈 ( Ju Hun Kim ),주성웅 ( Seong Woong Joo ),김동준 ( Dong Jun Kim ),김수영 ( Soo Young Kim ),황진일 ( Jin Il Hwang ),이형철 ( Hyung Chul Lee ),유병돈 ( Byung Don You ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.10
The reduction behavior of molten electric arc furnace (EAF) slag containing (FeO), (MnO) and (P2O5) was investigated using graphite as a reductant. Reaction temperature (1400-1600 ℃) and slag basicity (0.5-2.0) were varied during the experiment. Alumina and magnesia crucibles were used to observe the effect of refractory on the reduction behavior of the molten EAF slag. When an alumina crucible was used, (Al2O3) content in the slag increased significantly by its elution from the crucible. The content of poorly reducible oxides, (CaO), (MgO), and (SiO2), maintained an almost constant level regardless of the reaction temperature, because the increase of (Al2O3) and the decrease in reducible oxides (FeO, MnO, P2O5 etc.) offset one another. The reduction degree of reducible oxides evaluated through chemical composition analysis agreed well with that calculated by off-gas analysis. The reduction degree increased with an increase in the reaction temperature and the slag basicity. The reduction degree in the magnesia crucible was higher than that in the alumina crucible at identical conditions. When a magnesia crucible was used, the reduction reaction was more promoted due to the enhancement of the activity of (FeO) and (MnO), compared to the alumina crucible.