Environmental Impact Of Production Of Rare Earth Oxide From Ionic Rare Earth And NdFeB Waste Based On LCA

How to control the environmental impact of rare earth is an important research direction of rare earth development and product production in the field of resource and environmental effects in recent years.This article analyzes the literature through the literature review,and analyzes the research progress of ionic rare earth immersion process,extraction separation process,and rare earth waste recycling research progress;then based on the life cycle evaluation method,the e Footprint life cycle evaluation system is the main platform as the main platform as the main platform.Modeling calculation of the two different process processes of ionic rare earth and recycling of rare earth products for the production of rare earth products for the production of rare earth products,which explores the results of the two channels that affect the environment and the evaluation results of energy conservation and emission reduction.The results of the study show that every 1kg hybrid oxidation rare earth contributes the index of the production process of ionic rare earth resources,respectively,SO₂（9.94E-09 kg）,CO₂（4.28E-09 kg）,NO_X（4.88E-09 kg）,and NH₃-N（6.94E-09 kg）,COD（5.92E-10 kg）and IWU（9.06E-09 kg）,the contribution of recycling the production process of钕iron boron waste is SO₂（7.34E-09 kg）,CO₂（2.62E-09 kg）,NOx（2.93E-09 kg）,NH₃-N（6.87E-10 kg）,COD（2.06E-09 kg）,and IWU（1.95E-09kg）.From the perspective of energy conservation and emission reduction assessment,the contribution of ammonium sulfate to the production process of ionic rare earth resources is the largest;the contribution of oxalic acid to the production process of recycling cymbal iron boron waste is the largest;All need to be valued.Studies believe that the key material,process analysis,and sensitivity analysis will help find the development point that helps low-carbon green production,and then avoid pollution transfer or transformation caused by the need for end governance.In the process of developing ionic rare earth resources to produce products such as oxidation rare earth,ammonium bicarbonate,ammonium sulfate,and oxalic acid used in the place of immersion in place is the main source of environmental impact.Therefore,it is necessary to optimize the analysis of this stage to effectively reduce this.Potential environmental impact of the process.In the process of recycling the production of rare earths such as cymbal iron boron waste,oxalic acid precipitators used during the precipitation stage of the oxide are the largest auxiliary materials for potential environmental impacts,and process optimization analysis is required for this stage.In addition,through comparative analysis of the production of rare earth oxide LCA with fluorocarbon ore sources,it is found that contributing to water indexes,ionic rare earth ore as raw materials is 5104 times the production process of fluorocarbon mines as the raw material production process.Studies believe that whether the magnesium salt ore process can effectively alleviate the environmental impact brought by the water immersion process,it remains to be explored,but there is no doubt that the recycling of rare earth waste is of great significance to alleviate the environmental pressure of the rare earth industry.It can not only provide scientific guidance and suggestions for the path of green and low-carbon sustainable development for middle and upstream rare earth enterprises,but also provide a basis for energy conservation and emission reduction when choosing relevant enterprises in the industry chain when choosing middle rare earth products.