SCN^- from desulphurization waste solution of cocking plant was separated by D241 anion exchange resin. When SCN＂ concentration of the waste liquid is O.116mg/ml, its dynamic exchange capability is 93.61mg/g resin. T...SCN^- from desulphurization waste solution of cocking plant was separated by D241 anion exchange resin. When SCN＂ concentration of the waste liquid is O.116mg/ml, its dynamic exchange capability is 93.61mg/g resin. The condition of use KOH as eluted solution to elute SCN^- is KOH concentration 0.5mol/L, flow velocity 60mi/h, with 60ml eluted solution can completely elute SCN＂ which exchanged from waste solution. Vaporized the eluted solution, obtain the KSCN crystal in which the concentration of SCN^- is 53.34%, converts to KSCN is 89.2%. SCN^- crystal was separate out from Na2SO3/KOH mixed solution. The relationship between the proportion of Na2S2O3/KOH, free liquids in crystal and the saturation solution volume when crystal appear, the content of KSCN in crystal： the ratio of K2S2O3/KSCN show direct ratio with the saturation solution volume when the crystal birth, r^2=0.9964; when the ratio of K2S2O3/KSCN is between 0.15 and 0.25, the content of SCN^- in the crystals grow with K2S2O3 content increases, the content of free liquids in crystal also along with it increase; When the ratio of Na2S2O3/KOH is 0.15, the content of SCN^- is 54.56%; convert to KSCN is 76.2%. When the ratio of K2S2O3/ESCN is 0.25, the content of SCN^- is 65.28%; convert to KSCN is 91.2%. When the ratio of K2S2O3/KSCN exceeds 0.25, the content of SCN^- in the crystals and the content of free liquids in crystal reduce when the ratio of K2S2O3/KSCN increase.展开更多
文摘SCN^- from desulphurization waste solution of cocking plant was separated by D241 anion exchange resin. When SCN＂ concentration of the waste liquid is O.116mg/ml, its dynamic exchange capability is 93.61mg/g resin. The condition of use KOH as eluted solution to elute SCN^- is KOH concentration 0.5mol/L, flow velocity 60mi/h, with 60ml eluted solution can completely elute SCN＂ which exchanged from waste solution. Vaporized the eluted solution, obtain the KSCN crystal in which the concentration of SCN^- is 53.34%, converts to KSCN is 89.2%. SCN^- crystal was separate out from Na2SO3/KOH mixed solution. The relationship between the proportion of Na2S2O3/KOH, free liquids in crystal and the saturation solution volume when crystal appear, the content of KSCN in crystal： the ratio of K2S2O3/KSCN show direct ratio with the saturation solution volume when the crystal birth, r^2=0.9964; when the ratio of K2S2O3/KSCN is between 0.15 and 0.25, the content of SCN^- in the crystals grow with K2S2O3 content increases, the content of free liquids in crystal also along with it increase; When the ratio of Na2S2O3/KOH is 0.15, the content of SCN^- is 54.56%; convert to KSCN is 76.2%. When the ratio of K2S2O3/ESCN is 0.25, the content of SCN^- is 65.28%; convert to KSCN is 91.2%. When the ratio of K2S2O3/KSCN exceeds 0.25, the content of SCN^- in the crystals and the content of free liquids in crystal reduce when the ratio of K2S2O3/KSCN increase.
