The Research Of Leaching Separation From Extracted Vanadium Residue Using Sulfuric Acid Roasting Method And Preparation Of Function Materials

Nowadays,with the increasingly severe shortage of resources and environmental pollution,the utilization of waste materials has become the focus of research in the society.Chengde is a large vanadium titanium magnetite resource base,but it generates a lot of extracted vanadium residue when Simple mining vanadium titanium magnetite,which on the ecological environment caused very serious damage.Therefore,considering the fields of materials,energy and environmental protection,this paper presents a new method to prepare LiFePO4 cathode materials and oil proppant.The extraction of vanadium slag and sulfuric acid mixed roasting,the dissolution and solid-liquid separation of Fe elements in the form of ion concentration in the solution.The Fe elements in the solution were detected by chemical analysis method.Orthogonal experimental design,on this basis and single factor optimization experiments,effects of sulfuric acid and vanadium dregs molar ratio,water and sulfuric acid volume ratio,calcination temperature,holding time of the four factors in different levels of Fe extraction rate influence,and to determine the optimum roasting technics:sulfuric acid and molar ratio of waste slag and vanadium 2.5:1,acid water volume ratio 1:1.5,roasting temperature of 320?,insulation time 3h.The extraction rate of Fe reached 96.8%under this condition.The iron rich solution as raw material preparation of ammonium jarosite,and preparation of LiFePO4 as iron source.Design of the single factor optimization experiments,the reaction temperature,solution pH and reaction time on the effect of the quantity of alum,and to determine the optimum alum process:reaction temperature 95?,reaction pH 2.5,reaction time 6h.Under the condition of the existing 86.8%Fe conversion to ammonium jarosite.Ammonium jarosite as iron source,Li2CO3 as lithium source,glucose(sugarand starch)as carbon source,NH4H2PO4 as phosphorus source,administered by the furnace high temperature calcination prepared LiFePO4.The effects of adding different carbon sources and different C content on the electrochemical performance of lithium ion batteries were also explored.After analysis,with glucose mo lar ratio of carbon source and the adding amount of C and yellow ammonium jarosite is 55%,the battery has a better electrochemical performance.The first discharge specific capacity can reach 141.6mAh/g,the first charge discharge efficiency can reach 98.9%.Taking titanium slag and bauxite as raw materials to prepare oil proppant,considering the factors such as performance and cost,one best recipe is obtained:it is 80 wt%bauxite,20wt%the titanium slag,when the temperature is 1375? and holding time is 2h,the result of the performance is:The volume density is 1.58 g/cm3,the apparent density is 2.86g/cm3,the damage rate is 4.12%,those indicators meet the requirements of the low density high ? strength oil proppant in China National Petroleum Company standard.