Life Cycle Evaluation Of Multi-source Non-ferrous Smelting Solid Waste Recycling Process In Jiangxi Province

Multi-source non-ferrous smelting solid waste comes from various non-ferrous metal smelting processes.It is rich in valuable metal resources such as scattered metals and has recycling value.In addition,the chemical composition of secondary solid waste generated in the process of recovering valuable metals is similar to the chemical composition of building material raw materials,and can be used as a raw material substitute for the production of environmentally friendly building materials.In recent years,many scholars have carried out research on the resource utilization of multi-source non-ferrous smelting solid waste.In order to make the multi-source non-ferrous smelting solid waste recycling process more low-carbon and cleaner,the life cycle assessment method was introduced to analyze this,and put forward scientific suggestions for this process.Reasonable improvement suggestions to promote the construction and development of ecological civilization in Jiangxi Province.This study uses the life cycle assessment technology to collect the input and output data of the multi-source non-ferrous smelting solid waste resource utilization in the tellurium（Te）enrichment process and the secondary solid waste mixed into the cement clinker production process in Jiangxi Province.Chinese Life Cycle Database（CLCD）and CLCD method,on e Footprint software,enrich Te process,secondary solid waste composite cement clinker production process and ordinary silicic acid with multi-source non-ferrous smelting solid waste fire method and oxygen-enriched molten pool smelting technology A life cycle assessment study was carried out for the production process of salt cement clinker.By analyzing the controllable enrichment process of Te in the multi-source non-ferrous smelting solid waste,comprehensively comparing and analyzing the environmental impact index values of the secondary solid waste composite cement clinker and ordinary Portland cement clinker production process at each stage,identify the multi-source non-ferrous smelting solid waste.The controllable enrichment process of Te in waste,the main environmental impact indicators of environmental load caused by the production process of secondary solid waste composite cement clinker,the key unit process and the key process,etc.,and suggestions for improvement are put forward.The main conclusions of this study are:（1）The key impact indicators causing the environmental load of Te controllable enrichment process in 1.00 ton of multi-source non-ferrous smelting solid waste are primary energy consumption（PED）,water consumption（WU）,climate warming potential（GWP）,acidification（AP）and ecotoxicity（ET）,the values were 8089.53?kg,11645.43?kg,803.45?kg,5.10?kg,and 2.98,respectively.Among them,the normalized value of sulfur dioxide（SO₂）index is the largest,which is 1.98×10^-10.After the weighted summation,it is known that SO₂has the highest contribution to the comprehensive index of energy conservation and emission reduction in the 13th Five-Year Plan（ECER-135）,reaching 26.30%.The key unit process to improve the process is the pyro process stage;key processes are oxygen,electricity and tap water production,coal mining,and direct emissions of lead（Pb）,carbon dioxide（CO₂）and SO₂.（2）Except for the ozone layer depletion index,other environmental impact index values in the production process of 1.00 tons of secondary composite cement clinker are all lower than those in the production process of 1.00 ton of ordinary Portland cement clinker,resulting in the environmental load of the two clinker production processes.The types of key impact indicators are PED,WU and GWP.These three indicators in the production process of secondary composite cement clinker decreased by 3.77%,33.02%and 1.72%respectively compared with the latter,and the ECER-135 value of the latter was higher than that of the former.1.20×10^-10,after the weighted summation,it is known that the CO₂index in the production process of the secondary composite cement clinker has the most obvious impact on the comprehensive index,which is 59.13%,and in the range of 110?km to 620?km,the PED,WU and GWP values only increase 0.46%,0.26%and0.23%.The key unit process for optimizing this process is the clinker calcination stage;key processes are coal and shale mining,total electricity and tap water production,CO₂ emissions.