Journal of the Korean Institute of Resources Recycling最新文献

{"title":"The Study on the Removal Process of Heavy Metals from Mine Drainage Using Coal Bottom Ash","authors":"H. Kim, J. M. Lee, In-Kyu Han","doi":"10.7844/KIRR.2020.29.6.41","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.41","url":null,"abstract":"","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82446290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Study on Synthesis of Mayenite by Using Recycled Aluminium Resource for Application in Insulating Material","authors":"Byoungyong Im, Yubin Kang, S. Joo, D. Kim","doi":"10.7844/KIRR.2020.29.6.65","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.65","url":null,"abstract":"Black dross is a dark gray dross generated during the aluminum recycling process that uses flux, and contains NaCl, KCl, Al2O3, MgO, etc. Black dross is separated into soluble substances (NaCl, KCl) and insoluble substances (Al2O4, MgO) through the dissolution process. Soluble materials can be reused as salt flux, and Al2O3 and MgO can be upcycled to various ceramic materials through the synthesis process. In this study, Mayenite was synthesized using Al2O3 and MgO recovered from black dross, and the synthesis was performed according to the mixing ratio and reaction temperature. It was confirmed that when Mayenite was synthesized using black dross (spinel) and CaCO3, precursors were changed to Mg0.4Al2.4O4 and CaO at 700 °C, and to Ca12Al14O33 (Mayenite) after 800 °C. In the mixing conditions experiment, it was confirmed that the Mayenite XRD peak increased with increase of the CaCO3 content, and the Mg0.4Al2.4O4 XRD peak decreased. As a result of the BET analysis of the synthesized powder, the surface area decreased as the fine particles were grown and agglomerated in the process of generating mayenite.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87321858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research Trends in Flotation of Waste-plastics and Its Use as Functional Materials","authors":"Yosep Han, R. Kim, Hye-Jin Hong, In-Su Park, Dong‐Gyun Kim, Y. Kim, Hoseok Jeon, Hankwon Chang","doi":"10.7844/KIRR.2020.29.6.15","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.15","url":null,"abstract":"In recent years, there is an increasing interest in environmental friendly treatment of waste-plastics in terms of the generation of microplastics. Accordingly, the recycling of waste-plastics is very important because it provides advantages of volume reduction, mitigation of carbon dioxide emission, and reproduction of value-added products. In particular, in order to recycle the eco-friendly waste-plastics, it is necessary to use a physical separation methods, and among them, flotation separation, which can separate material (i.e., polymer component) in waste-plastics is well known as a very effective separation method in terms of material recycle. Therefore, in this review, the research trend of flotation separation for effective separation of mixture waste-plastics was investigated. In addition, through the reported research results, approaches to use as new functional materials from polymers, which are raw materials for waste-plastics, are summarized.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84017798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Interaction between Depressants Zinc Sulfate and Xanthate on the Flotation of Sphalerite","authors":"Minkyu Kim, Kwang-Seok You","doi":"10.7844/KIRR.2020.29.6.98","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.98","url":null,"abstract":"In this study, the depression behavior of zinc sulfate on the sphalerite with the addition of potassium butyl xanthate was investigated to clear the relationship between zinc sulfate and xanthate in depression of sphalerite. As a result of the experiment, it was confirmed that the depress effect of zinc sulfate on the sphalerite declined with the increase of its addition amount. From the results of SEM-EDS and FT-IR analysis, it was found out that the amorphous precipitate of metal xanthate (Zn-BX) was formed in sphalerite concentrate, when the solubility product of [Zn]·[BX] in the pulp solution exceeded 3.71×10, which is the solubility of Zn-butyl xanthate. It is considered that the Zn-butyl xanthate had a negative effect on the depression of sphalerite.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88185605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Study on the Removal of Sulfate in Li2CO3 by Recrystallization","authors":"Kihun Kim, Yeon-Chul Cho, In-Hwan Jang, Jae-Woo Ahn","doi":"10.7844/KIRR.2020.29.6.27","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.27","url":null,"abstract":"In order to remove sulfate(SO4 2-) and purify the Li2CO3, dissolution and recrystallization of crude Li2CO3 using distilled water and HCl solution was performed. When Li2CO3 was dissolved using distilled water, the amount of dissolved Li2CO3(wt.%) increased as the solution temperature decrease and showed about 1.50 wt.% at 2.5°C. In addition, when Na2CO3 was added and the Li2CO3 solution was recrystallized, the recrystallization(%) increased with increasing temperature, resulting in a 49.00 % at 95 °C. On the other hand, when Li2CO3 was dissolved using HCl solution, there was no effect of reaction temperature. As the concentration of HCl solution increased, the amount of dissolved Li2CO3(wt.%) increased, indicating 7.10 wt.% in 2.0 M HCl solution. When the LiCl solution was recrystallized by adding Na2CO3, it exhibited a recrystallization(%) of 86.10 % at a reaction temperature of 70 °C, and showed a sulfate ion removal(%) of 96.50 % or more. Finally, more than 99.10 % of Na and more than 99.90 % of sulfate were removed from the recrystallized Li2CO3 powder through water washing, and purified Li2CO3 with a purity of 99.10 % could be recovered.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83141069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Study of Organic Impurity Removal Efficiency for Waste LCD Touch Panel Glass by Solvents Types","authors":"Yubin Kang, Jin-Ju Choi, Jae Layng Park, C. Lee","doi":"10.7844/KIRR.2020.29.6.57","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.57","url":null,"abstract":"In this study, removal of OCA and organic impurities for recycling LCD touch panel glass was conducted by mechanical and chemical dissolution methode. Cut mill and oscillation mill were used for mechanical crushing of touch panel, and water, ethanol, dichloromethane were used to remove OCA and organic impurities. As a result of TGA, when applied only dicloromethane in the process, the efficiency of organic removal was to be best. In addition, removal effect of organic impurities increased as the cleaning temperature increased. As a result of zeta potential analysis to confirm the dispersion degree of touch panel glass in the solvent, the absolute value of the zeta potenial of water with the lowest cleaning effect was lower than other solvents, and it was confirmed that efficiency of organic removal is affected not only by the chemical dissolution properties but also the physical dispersion properties in the solvent.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87021840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of Bubble Size in Flotation Column using Image Analysis System","authors":"Ki-Seon An, Hogeun Park","doi":"10.7844/KIRR.2020.29.6.104","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.104","url":null,"abstract":"Bubble size in froth flotation has long been recognized as a key factor which affects the bubble residence time, the bubble surface area flux (Sb) and the carrying rate (Cr). This paper presents method of bubble size measurement, relationship between operating variables and gas dispersion properties in flotation column. Using high speed camera and image analysis system, bubble size has been directly measured as a function of operating parameters (e.g., superficial gas rate (Jg), superficial wash water rate (Jw), frother concentration) in flotation column. Relationship compared to measured and estimated bubble size was obtained within error ranges of ±15~20% and mean bubble size was 0.718mm. From this system the empirical relationship to control the bubble size and distribution has been developed under operating conditions such as Jg of 0.65~1.3cm/s, Jw of 0.13~0.52cm/s and frother concentration of 60~200ppm. Surface tension and bubble size decreased as frother concentration increased. It seemed that critical coalescence concentration (CCC) of bubbles was 200ppm so that surface tension was the · Received : December 10, 2020 · Revised : December 18, 2020 · Accepted : December 23, 2020 § Corresponding Author : Chul-Hyun Park (E-mail : chpark@chosun.ac.kr) Department of Energy and Resources Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Korea cThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited. 이미지 분석시스템을 이용한 부선컬럼에서 기포크기의 측정 105 자원리싸이클링 제 29권 제 6호, 2020 1. 서 론 부유선별에서 기포는 유용물질의 운송수단으로써 중 요한 역할을 한다. 기포와 광물간의 충돌, 부착 및 탈착 과 정의 빈도 및 선택성에 따라 선별효율이 달라진다. 컬럼 부선의 구조는 크게 포집대와 세척대로 대별된다. 포집대 영역에서는 기포발생장치인 스파져(Sparger)에서 발생된 기포의 상향류와 급광 및 세척수의 하향류를 통해 믹싱이 이루어지고 유용광물이 선택적으로 기포에 부착되어 세 척대로 부유된다. 세척대는 바이어스에 의해 무용광물을 포집대로 떨어뜨리는 역할을 한다. 포집대에서 기포발생, 믹싱 및 유용광물의 회수에 중요 한 역할을 하는 가스분산특성은 기포크기, 가스홀드업, 가 스속도 및 기포표면적비 등의 요소들로 나타낼 수 있다. 특히 기포크기 및 특성은 부선효율에 큰 영향을 미치는 주 요 인자로써 기계적인 요소(기포발생장치, 난류 및 가스 유량 등), 용액의 화학적변화(기포제 종류 및 농도), 광액 의 상태(밀도 및 점도등) 및 기타요인(온도 및 대기압 등) 에 따라 다르게 생성 된다. 이와 같은 다양한 요인들과 기포크기와의 상관관계를 규명하고 정립함에 따라 컬럼 부선 효율을 최적화할 수 있다. 기포크기 측정은 2000년대 초반까지 대부분 컬럼상단 부 내에 삽입된 튜브로 상승 기포를 추출하는 방식이 널리 이용되었고 상단부에 배출된 기포크기와 Masliyah (1979) 의 간섭침강식을 비교한 관계식에 의해 컬럼내부의 기 포크기가 평가되었다. 이후 컬럼내부와 유사한 환경에 서 빠르게 이동하는 기포의 감속 및 명확한 기포의 이미지 를 얻기 위한 연구가 지속되었고 특정 구간의 기포를 별도 의 기포뷰어(Bubble viewer)에 추출/측정법, 컬럼의 벽 에 45°의 관을 삽입하여 얇은 cell에 기포를 추출/측정법 그리고 Viewer 및 cell의 두 방식을 응용한 기포크기 측정 법이 이용되었다. 기존의 외부추출 방법들은 컬럼내부의 실질적인 기포 크기를 반영하지 못하는 단점이 있었다. 따라서 컬럼내부 에서 직접 기포를 측정하기 위한 방법들이 시도되었다. 컬럼내부에서 상승하는 기포크기를 직접 촬영 및 측정 연 구, 컴퓨터 이미지 분석시스템을 이용한 기포크기 및 상 태 연구, 전기저항 토모그래피와 압력계를 이용한 컬럼 내부 모델화 및 기포분포의 연구, 기포와 광물부착 및 기포병합/분포의 연구들이 진행되었다. 본 연구에서는 초고속카메라 및 제이스(ZEISS) 이미 지 ","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"313 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75240355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Current Research Trends for Recovery of Rare Earth Elements Contained in Coal Ash","authors":"Young-Jin Kim, Moon-Kwan Choi, Jun-hyung Seo, Byung-Ryeol Kim, Kye-Hong Cho","doi":"10.7844/KIRR.2020.29.6.3","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.3","url":null,"abstract":"This study aims to introduce and review on the recovery technologies of rare earth elements(REEs) from coal ash. Many researchers have been carried out by various beneficiation processes, such as particle size separation, magnetic separation, specific gravity, and flotation to recover rare earth elements from coal ash generated from Pulverized Coal(PC) boiler. Through the beneficiation process, it was confirmed that concentration of rare earth elements was much lower than the 4,700 ppm, and that additional enrichment treatment through wet process was needed for the products recovered after the beneficiation process. It was confirmed that the rare earth elements contained in coal ash were applied to the leaching process after pretreatment such as alkali-fusion to improve leaching efficiency. Although beneficiation and leaching methods have been studied, its optimum recovery technologies for rare earth elements not been confirmed up to now, research on the recovery of rare earth contained in coal ash is reported to continue. In case of Korea, the technology for the recovery of rare earth elements from coal ash and coal by-product could not been confirmed up to present. In these reasons, it is urgent to develop technologies such as beneficiation and leaching process continuously.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84321151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Basic Study on the Recycling of Wasted Cemented Carbide by the Zn Bath Process(Ⅰ)","authors":"Kyung-Sik Kim, In-Ho Kim, C. Lee, Chang-Bin Song","doi":"10.7844/KIRR.2020.29.6.35","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.35","url":null,"abstract":"In this study were carried out basic experiments mainly to investigate important reaction mechanism, the reaction temperature, time and the addition amount of Zn in recycling of waste cemented carbide by the zinc bath process. As a result, it was required that the Zn bath reaction was heated more than at 800°C to accelerate reaction of melted Zn and Co inside of wasted cemented carbide. Furthermore, thickness of the waste cemented carbide was reduced linearly according to increase of reaction time at 700°C for 0.5~2h in the zinc bath reaction. Also the zinc bath reaction was examined that heating in lower than at 800°C for 3h and then heated more than at 900°C for 1h(above 3.0x10 torr vaccum) was suitable to reduce vapour loss amount of Zn in the zinc bath process.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88941263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Burnability and Mineral Properties of Clinker Added Chlorine","authors":"Tae-yeon Kim, Nam-Il Kim, Yong-sik Chu","doi":"10.7844/KIRR.2020.29.6.48","DOIUrl":"https://doi.org/10.7844/KIRR.2020.29.6.48","url":null,"abstract":"In this study, raw mix was mixed with CaCl2 for analyzing characteristics of clinker added chlorine and chlorine was added by 2,000ppm at high concentration condition. The raw mix added chlorine was burned at 1250°C~1350°C and maintained during 10minutes at each maximum temperature. Clinker target modulus was LSF 92, SM 2.5 and IM 1.6 in this study. The burnability of clinker added chlorine was identified by free-CaO content. Free-CaO content decreased as chlorine content increased and free-CaO content of 1350°C-2000ppm clinker decreased by 1.5%. Optical microscope and XRD Analyses were used for identify mineral properties of clinker added chlorine. The mineral of clinker could not be observed at 1250°C and the size of alite grew larger as chlorine content increased at 1350°C. It showed a good crystallizability as chlorine content increased. As chlorine content of clinker increased, clinker showed a good burnability and mineral property.","PeriodicalId":17385,"journal":{"name":"Journal of the Korean Institute of Resources Recycling","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82556221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}