多源有色冶炼固废中稀散金属可控富集过程的生命周期评价--以富集碲为例

Study on the life cycle evaluation of the controlled enrichment process of scattered metals in the solid waste of multisource nonferrous smelting solid waste-taking tellurium enrichment as an example

为研究从多种有色金属冶炼过程产生的浸出渣、黑铜泥和铜砷饼等有色冶炼固废中稀散金属Te可控富集过程资源消耗及环境影响情况,运用生命周期评价(LCA)技术评估了该过程对环境的负荷。在eFootprint上建立相应的LCA模型,并对研究范围、清单数据、环境影响结果等进行分析。结果表明,该工艺生产过程对初级能源消耗、水资源消耗、全球变暖潜值、酸化及生态毒性的影响较大。从1.00 t多源有色冶炼固废中富集1.46 kg碲粉,要消耗8089.53 MJ的初级能源和11645.43 kg水资源,还排放803.45 kg造成温室效应的气体,产生5.10 kg酸性物质,并且生态毒性指标值为2.98。结合工艺特点,通过对LCA结果和清单数据敏感度分析,为整个生产过程提供了绿色改进方案。

In order to study the resource consumption and environmental impact of the controllable enrichment process of scattered metals in non-ferrous smelting solid wastes such as leaching residue,black copper mud and copper arsenic residue generated from various non-ferrous metal smelting processes,life cycle assessment(LCA)was used to evaluate the environmental load of the process.The corresponding LCA model was established on eFootprint,and the research scope,inventory data and environmental impact results were analyzed.The results show that the process has a great impact on primary energy consumption,water consumption,global warming potential,acidification and ecotoxicity.Enrichment of 1.46 kg tellurium powder from 1.00 tons of non-ferrous smelting solid waste consumes 8089.53 MJ of primary energy and 11645.43 kg of water resources,emits 803.45 kg of greenhouse gases and produces 5.10 kg of acidic substances.The ecotoxicity index value was 2.98.Combined with the process characteristics,through sensitivity analysis of LCA results and inventory data,a green improvement scheme is provided for the whole production process.