摘要
Abstract
This study focuses on the middlings from a copper slag concentrator plant,conducting a systematic study on their process mineralogy.The results indicate that the copper in the middlings primarily exists as sulfides,with minor amounts present as native/alloy,iron oxides,and silicates.Most of the minerals are in the size range of-5 μm,with very fine particle sizes,and most of them are intergrowths,which makes flotation difficult.After the re-grinding treatment of the middling,the liberation degree of elemental copper and copper sulfides is significantly improved,the exposure degree of copper particles is obviously increased,and the embedding degree with silicate gangue is significantly reduced.The results of the closed-circuit flotation in the laboratory show that after the flotation of the unground middlings,a copper concentrate with a copper grade of 4.38%and a recovery rate of 51.33%was obtained,and the copper grade of the tailings was 0.37%.While after regrinding and separation,a copper concentrate with a copper grade of 7.63%and a recovery rate of 64.67%was obtained,and the copper grade of the tailings was 0.28%.Regrinding increased the copper grade of the concentrate by 3.25 percentage points and the recovery rate by 13.34 percentage points,while reducing the copper grade of the tailings by 0.09 percentage points.The closed-circuit flotation test with a flotation column shows that when the middling from the slag is directly floated by the flotation column without re-grinding,a copper concentrate with a Cu grade of 5.25%and a recovery rate of 34.29%is obtained,and the Cu grade of the tailings is 0.67%;while after re-grinding,the obtained concentrate has a copper grade of 5.85%and a recovery rate of 50.39%,and the Cu grade of the tailings is 0.53%.Re-grinding has increased the grade of the copper concentrate by 0.60 percentage points and reduced the Cu grade of the tailings by 0.14 percentage points.关键词
铜渣/工艺矿物学/浮选/中矿再磨/浮选柱/解离度Key words
copper slag/process mineralogy/flotation/re-grinding of middling/flotation column/liberation degree分类
矿业与冶金
