Cu-Ni-Co-Fe-S 매트의 분쇄/분급 공정 설계
Closed Grinding Circuit Design of Cu-Ni-Co-Fe-S Matte
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초록
Cu-Fe-Ni-Co-S 매트의 분쇄일지수를 측정하였으며, 이어서 볼밀과 스파이럴 분급기로 구성된 매트의 폐회로 분쇄 공정을 설계하였다. 우선 XRF와 SEM-EDS 분석을 이용하여 매트의 광물학적, 화학적 조성 변화를 조사하였다. 이어서 본드 분쇄 일지수 시험 방법을 이용하여 본드 분쇄 일지수를 측정하였으며, 측정된 본드 분쇄 일지수를 바탕으로 분쇄 공정에서 사용되는 기기의 종류와 규격을 결정하였다. 실험 결과, 매트에 황 함량이 많을수록 본드 분쇄일지수 값이 낮게 나타났으며, 황 함량이 15.9 wt.%에서 24.9 wt.%으로 증가함에 따라 최대 45%의 분쇄일지수가 감소함을 확인할 수 있었다. 분쇄 공정 설계 시, 개회로와 폐회로 공정을 비교하였으며, 폐회로 공정 운용 시 분급 공정으로습식 싸이클론과 스파이럴 분급기의 사용을 검토하였다.
Abstract
Bond work index of Cu-Ni-Co-Fe-S matte having different sulfur contents was measured, followed by closed grinding circuit design which consisted of ball mill and spiral classifier. At first, the mineralogical and chemical contents of the matte was analyzed using XRF and SEM-EDS method. Afterward, Grinding work index of matte was estimated using the Bond work index test. The work index measured was used to determine grinding circuit specification lastly. It was found that the more the sulfur concentration was in the matte, the less Bond work index value was as sulfur contents increased from S 15.9 wt.% - S 24.9 wt.%. As a result, the grinding energy was reduced up to 45% in the range. For grinding process design, Closed grinding circuit was compared with open grinding circuit, in which hydrocyclone and spiral classifier were also investigated.
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