Study On Recycling Of Industrial Grade Ammonium Phosphate Waste Residue

Based on the industrial grade ammonium phosphate(IMAP)residue produced by a chemical enterprise in Hubei as the research obj ect,the physicochemical properties of the slag were qualitatively and quantitatively analyzed by XRD,ICP-MAS,and ion chromatography.On this basis,the residue was washed,dried,acid soluble,defluorinated,desulphurized,extracted,and reversed.The best conditions for the acid solution,the best conditions for the removal of fluorine and sulfur,the best conditions for extraction and stripping are determined,and the final purpose of the effective extraction of phosphorus in the waste residue is achieved.Qualitative and quantitative analysis of fresh filter slag shows that there are some compounds such as NH4)2S04?NH4H2PO4?Mg(Fe?Al)(NH4)2(HPO4)2F3?MgHPO4?CaHPO4,etc.The water soluble phosphorus content decreased from 18.24%to 5.58 and the total phosphorus content decreased from 44.7%to 34.76%The residue contains(NH4)2SO4?CaHPO4?MgHPO4?NH4H2PO4?Mg(Fe?Al)(NH4)2(HPO4)2F3 and other compoundsFor(?)residue content of each component in the total phosphorus(P2O5):44.70%,(?)water soluble phosphorus(P2O5):18.24%,(?)(SO3):3.52%,(?)(MgO=):8.75%,(?)(CaO):2.10%,(?)(Fe2O3):1.75%,(?)(Al2O3):4.72%,(?)(N):8.33%,(?)(F):7.3 1%Water filter residue content of components for(?)total phosphorus(P2O5):34.76%,(?)water soluble phosphorus(P2O5):5.58%,(?)(SO3):1.89%,(?)(MgO=):9.80%,(?)(CaO):2.52%,(?)(Fe2O3):2.39%,(?)(Al2O3):6.42%,(?)(N):6.17%,(?)(F):10.98%Acid soluble experiment,the best reaction conditions as follows:85 ?,2.0 mol/L H2SO4,30 minIn the defluorination experiment,the optimum reaction conditions were as follows:sodium carbonate 300 rmins 40 ?,molar defluorination dose 1,the defluorination rate 80.8%Preliminary desulphurization experiment,the optimum reaction conditions are calcium carbonate,60 ?,300 r/min,the desulfurization dose mole ratio is 1,120 min,the preliminary desulphurization rate is 94.4%;In the experiment of deep desulphurization,the optimum reaction conditions are barium carbonate,the molar number of barium carbonate added in the solution is the residual SO42-mol number in solution for 7 min,and the rate of deep desulfurization is 98.6%In the extraction experiment,the optimum reaction conditions are as follows n-butanol 10 min,room temperature 20 ??(33%)phosphoric acid solution 200 r/min,extraction rate 52.47%In the experiment of stripping,the optimum conditions are as follows:the volume of extraction solution is 5 min,the temperature is 20 ?,the ratio of stripping is 82.29%,the amount of water is 40%,the volume of extraction solution is 5 min,the temperature is 20 ?,and the stripping rate is 82.29%The physical and chemical properties of industrial grade ammonium phosphate waste residue were studied and its composition and composition were analyzed.The experimental process of water washing,acid washing,defluorination,desulphurization,extraction and back extraction was carried out.The total recovery rate of phosphorus reached 51.13 in theory,which provided a technical route for the recycling of phosphorus-rich waste residue produced by phosphorus chemical industry.