关键词: 硼铁矿, 火法分离, 环境影响, 生命周期评价

Abstract: A life cycle impact assessment method was applied to analyze the environmental impacts resulting from the process of pyrometallurgical separation of paigeite ore quantitatively. The correlative environmental impacts include climate change, acidification, photochemical ozone formation, nutrient enrichment, human toxicity, mineral depletion, fossil energy depletion, water depletion and land occupation, and the impact scores are expressed as mining and processing of 10000 t paigeite ore. The results showed that climate change score is 1.45′107 kg CO2-eq, acidification score 3.61′104 kg SO2-eq, photochemical ozone formation score 7.16′102 kg C2H4-eq, nutrient enrichment score 30.41 kg PO43--eq, human toxicity score 2.43′104 kg C6H4Cl2-eq, mineral depletion and fossil energy depletion scores are 7.72′103 kg Sb-eq and 3.68′10-1 kg Sb-eq respectively, water depletion score 1.24′105 m3 and land occupation score 7.98′106 kg solid waste. In view of the production link, water depletion and land occupation resulting from material production is dominant, the scores of climate change, photochemical ozone formation, nutrient enrichment, mineral depletion and fossil energy depletion resulting from smelting by blast furnace are larger than that from other production link, and borax production holds a very important place in acidification and human toxicity. From the source of each environmental impact, the impacts resulting from energy production are larger than that from production process for all impact categories expect mineral depletion, water depletion, energy depletion and land occupation.

Key words: paigeite ore, pyrometallurgical separation, environmental impact, life cycle assessment