A Study on the Separation and Recovery of Useful Metallic Elements(Zn,  Pb) from the 2nd Dust in Refining of Crude-Zinc Oxide

Jae-hong Yoon; Chi-hyun Yoon

doi:10.7844/kirr.2021.30.1.66

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2021 Vol.30, Issue 1 Preview Page Next Page

Research Paper

A Study on the Separation and Recovery of Useful Metallic Elements(Zn, Pb) from the 2nd Dust in Refining of Crude-Zinc Oxide 조산화아연의 정제과정에서 발생된 2차분진으로부터 유용금속원소(Zn, Pb)의 분리회수에 관한 연구

28 February 2021. pp. 66-76

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Abstract

Electric arc furnace dust (EAFD) contains compounds, such as oxides and chlorides, including large quantities of Zn, Pb and Fe. An efficient and stable method for the extraction of metal elements from EAFD is the Rotary Kiln Process. This method is used to recover Zn in the form of crude ZnO (approximately 60%) via the addition of a reducing agent (coke, anthracite) and limestone (for basicity control) to EAFD. This process is commonly used in industry as well as in research and development. Currently, this method is used in many Korean commercial plants, producing approximately 150,000 tons of Crude ZnO per year. The majority of Zn is found in crude ZnO (approximately 76%). In addition components such as Pb, Cd, Sn, In, Fe, Cl, and F are present as oxides, chlorides, and alkaline compounds. This elements have an adverse effect on the zinc smelting process. Therefore, a refining process that eliminates these impurities is essential. In this study, we developed a process technology that efficiently separates Zn and Pb from byproducts (mainly chlorides). A bag filter was used to collect Zn and Pb generated during the dry purification process of crude ZnO. Pure components were recovered as metals or metal carbonate.

Keywords

EAFD (Electric Arc Furnace Dust)

Recycling

Crude Zinc Oxide Roasting

Oxidation Roasting Products Recycling

ZnCO₃(S)

PbCO₃(S)

전기로 제강분진 중에는 아연(Zn), 납(Pb)등과 같은 유가금속들이, 다양한 화합물(산화물 또는 염화물 등)의 형태로 다량 함유되어 있다. 전기로 제강분진 내에 함유되어 있는 이들 유용금속원소들을, 가장 효율적이며 안정적으로 회수할 수 있는 대표적인 방법으로서는 Rotary Kiln Process가 있다. Rotary Kiln Process는 전기로 제강분진에 환원제(Coke, 무연탄)와 석회석(염기도 제어용)을 첨가하여 성형한 후에 가열함으로서, 아연성분을 조산화아연(Crude Zinc Oxide : 60% Zn)의 형태로 회수하는 방법으로 오래전에 이미 상용화되었으며, 지금도 공정 및 설비의 단점을 개선하기 위한 연구개발을 지속적으로 수행하고 있다. 현재 국내에서도 전기로 제강분진을 재활용하여 조산화아연을 생산하는 다수의 상용화공장들이 가동되고 있다. 조산화아연 중에는, 아연성분 외에도 다양한 기타의 성분원소들(Pb, Cd, Sn, In, Fe, Cl, F 등)이 산화물, 염화물, 알칼리 화합물 등의 형태로 함께 혼재되어 있다. 그러므로 조산화아연을 건식 또는 습식아연제련용 원료로서 그대로 사용하게 되면 조산화아연에 함유된 이들 불순물 성분들이 미치는 악영향으로 인하여, 아연제련과정에서 많은 문제점들이 발생하므로. 따라서 이들 불순물 성분원소들을 가능하면 모두 제거하기 위한 건식 또는 습식정제공정이 추가로 필요하다. 따라서 본 연구에서는 조산화아연의 건식휘발 정제공정에서 발생되어 백필터에 포집된 아연(Zn) 및 납(Pb)을 함유한 2차분진(2nd Dust)으로부터 아연(Zn)과 납(Pb)을 효율적으로 분리하고, 더욱 부가가치를 높이기 위하여 Zn-cementation법으로 이들 성분원소들을 금속탄산염의 형태로 분리회수할 수 있는 공정기술에 대하여 기초적인 연구를 수행하였다.

키워드

전기로제강분진

재활용

조산화아연 산화배소

산화배소 부산물

ZnCO₃(s)

PbCO₃(s)

References

Sune Eriksson, 1991 : Disposal, Recycling & Recovery of EAF Exhaust Dust, AIME. pp.145-149.

Eung-Cho Lee, 1998 : Study on the development of hydro-metallurgy processes of Electric Arc Furnace dust, Research report, National research foundation of Korea.

Eung-Cho Lee, 1998 : Study on the development of hydro-metallurgical processes of electric Arc Furnace dust, Research report, National research foundation of Korea.

H.K. Shin, D.Y. Lee, S.M. Moon, 1999 : Recovery of Metals from EAF Dust with RAPID System GME'99, pp.450-456.

Kim, B.S., Park, J.T., Kim, D.S., et al., 2006 : Carbothermic reduction of zinc oxide with iron oxide, Journal of Korean Institute of Resources Recycling, 15(4), pp.44-51.

Kim, B.S., Kim, D.S., Park, J.T., et al., 2007 : Thermal reduction of zinc oxide in EAF dust by solid carbon under Non-isothermal condition, Journal of Korean Institute of Met. & Mater., 45(8), pp.458-464.

Kim, B.S., Park, J.T., Kim, D.S., et al., 2006 : Carbothermic Reduction of Zinc Oxide with Iron Oxide, J. of Korean Inst. of Resources Recycling, 15(4), pp.44-51.

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 30
No :1
Pages :66-76
Received Date : 2020-12-23
Revised Date : 2021-02-01; 2021-02-15
Accepted Date : 2021-02-19
DOI :https://doi.org/10.7844/kirr.2021.30.1.66

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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