| There are many kinds of solid wastes in China's copper lead zinc smelting industry,which contain a large number of valuable resources such as copper,lead zinc,silver and nickel,and environmental toxic components such as cadmium,chromium,mercury and arsenic.Taking the zinc smelting subsystem of copper lead zinc comprehensive smelting base in Shuikoushan area as an example,on the basis of literature review,expert consultation and field investigation,combined with the actual process production situation,three solid waste collaborative utilization modes of ‘Direct storage and sale',‘Internal circulation of the system' and ‘Co utilization of copper,lead and zinc'were constructed.Firstly,the system boundary of solid waste collaborative utilization is divided based on the life cycle assessment method,and the data of resource energy consumption and pollutant emission required in the life cycle assessment stage are collected.With the help of simapro analysis software and Ecoinvent3,ELCD and RCEES2017 database platforms,the inventory analysis model is established,and the life cycle environmental impact of solid waste co utilization was quantitatively evaluated by Re Ci Pe 2016 Midpoint(E)method.The specific categories include global warming,ozone layer destruction,particulate matter formation,acidification,water eutrophication,human carcinogenic toxicity,human non carcinogenic toxicity,mineral resource consumption and fossil resource consumption.Based on the results of life cycle assessment,the resource consumption,environmental risk,material circulation and economic benefit of zinc smelting system were calculated by combining AHP and entropy method,and the ecological efficiency of different solid waste collaborative utilization modes was comprehensively evaluated.The results show that:(1)The environmental impact load of scenario 3 is the lowest,only 14.25%.Compared with scenario 2,the environmental impact load of scenario 3 decreases by19.61%.At the same time,scenario 3 has the highest ecological efficiency,and its comprehensive evaluation index of ecological efficiency is three times higher than scenario 1,that is,the direct treatment mode of solid waste.Among them,from scenario 1 to scenario 3,the environmental impact load of the ecosystem showed a decreasing trend,from scenario 1 to scenario 2 decreased by 6.94%,and from scenario 3 further decreased by 14.99%,reaching the lowest value.(2)From the results of standardized environmental impact types,the main environmental impact types caused by the three scenarios of solid waste collaborative treatment production process are human carcinogenic toxicity and human non carcinogenic toxicity,accounting for more than 95%,followed by acidification,particulate matter formation,global warming and fossil resource consumption,accounting for 0.1% to 0.3%,and the proportion of ozone layer destruction and mineral resource consumption is relatively high The influence value is the smallest.(3)From the perspective of material circulation and economic benefits,the comprehensive utilization rate of scenario 3 solid waste reached 97.62%,Cu,Pb and Zn recovery rate reached 97.19%,97.52% and 99.55% respectively,and the total profit increased by 111548000 yuan;however,from the perspective of environmental risk,the heavy metal environmental pollution emission in the waste gas of copper lead zinc co smelting solid waste mode increased by nearly 1591.8 t.The heavy metal pollution emission in solid waste was reduced by 1470.4t.(4)From the perspective of improving the overall comprehensive ecological and environmental benefits,through the construction of copper,lead and zinc solid waste collaborative smelting industry mode,strengthening the comprehensive utilization of solid waste among zinc copper and zinc lead systems,the resource output efficiency of enterprises can be greatly improved,but in this process,the air pollution emission control of solid waste toxic pollutants needs to be strengthened. |
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