Study On Removing The Iron Ions In The Sulphuric Acid By D001Ion Exchange Resin

Sulfate has the laudatory name of the mother of industrial, and it is widely used inchemical industry and steel.But in the process of production, the utilization rate of sulfuricacid is very low. A large number of sulfuric acid discharge with acid waste water, whichcan not only make the water or soil acidification and cause harm to ecological environmentbut also waste a lot of resource waste if it is discharged as the wastewater withouttreatment. Waste sulphuric acid and sulfuric acid wastewater treatment is an urgent need onthe subject. sulfuric acid and sulfuric acid wastewater is acidity and it contains largeamounts of impurities. Removing waste sulfuric acid and sulfuric acid wastewater has thevital significance to reuse sulfuric acid for recycling. The process of producing sulfuricacid when raw material is pyrite, iron ions content of impurity is high. Thus, we mustremove ferric ion to recover sulfuric acid.By reading lots of literature,iron removal methods at home and abroad are reviewedin the first chapter of paper. Comparing advantages and disadvantag-es of iron removalmethods, and combining with the actual production process route, the paper ultimatelydetermine the ion exchange process for iron removal methods. Ion exchange method is touse the exchange of ion exchanger with pending solution carries on the exchange reactionof metal ions. The metal ion is replaced to exchange group to be removed.This craft hassimple process, low equipment investment cost, easy operation, and repeatedly used.andthe iron removal effect is good. It is a kind of efficient economic and environmentalprotection to remove iron.The second chapter of this paper introduce the experimental apparatus,experimentmethod and the determination method of iron ions content in sulfuric acid.The third chapter of this paper is to solve the problem of resin screening and the effectof resin deironing. Four different resin are choosed.They are D001resin and D003resin(large hole, Strong cation exchange resin), D68resin (chelating resin), HZ160(anion resin),with the dynamic saturation adsorption capacity as an index. Considered from two aspectsof resin adsorption capacity and regeneration ability, the paper determine the D001resin as the ultimate job deironing resin and investigate deferrization effect factors on resin.Thepaper has examined the effects of temperature on the adsorption.When temperatureincreases, D001resin adsorption quantity of iron ion will also continue to increase.Sotemperature increment is good for resin adsorption, When balance reaches a certain degree,the ultimate concentration of a solution is no longer change. Isothermal adsorption curveupward trend slowly becomes very smooth. The saturated adsorption capacity alsobasically maintains constant. Considering the actual production process demands, roomtemperature is choosed to determine the adsorption.The influence of velocity on theadsorption effect is investigated.When the velocity are1.5ml/min,2.0ml/min,2.5ml/min,an-d3.0ml/min, the iron removal rate are close;when u=3.5ml/min, the resin adsorptionability is stronger, iron ion removal rate increases significantly; when velocity is smalllower, the rate of adsorption rate is slower, which means that the same volume of resin canadsorb more iron ions when flow velocity is slow. When samples acid capacity is greaterthan250ml, resin adsorption ability bacomes weak, iron ion removal rate changes little.In the forth chapter,the paper has studied thermodynamics and kinetics of D001resinadsorption.(1) by thermodynamic test, fitting of resin adsorption process was calculated bythe isothermal adsorption model, the fitting results show that the adsorption isotherm ofLangmiur and Freundlich equation fitting of the R value is above0.99, the fitting effect isvery good, but the R value of Langmiur equation is higher, which shows that Langmiurequation can better fit the resin adsorption process.From the Freundlich equation fitting ofn is greater than1, it explains that adsorption can easy conduct.By van’t hoff equation,according to the calculated thermodynamic function change,it shows that resin adsorptionprocess of adsorption free energy changes are less than zero. It can be seen that D001resinand iron ion exchange reaction is a spontaneous process; Resin exchange reaction enthalpychange is more than zero.It can be known that the adsorption process is endothermic.Temperature increment is conducive to the adsorption of exchange reaction; the calculatedsystem adsorption entropy change is more than0, which indicated that the chaotic degreeof the adsorption process increases.Resin adsorption kinetics fitting results show that thequasi secondary dynamics mathematical model fitting R2value is greater than must first order kinetics mathematical model, and therefore must level2dynamic mathematicalmodel can better describe D001resin absorption of iron ion behavior.Through the adsorpti-on process control steps of mathematical model fitting, particle diffusion for D001resinand iron ion exchange adsorption reaction rate control steps.The pretreatment and regeneration process of resin was studied in chapter five. Itsmain content contains below:1.It has studied the influence work of pretreatment of thedifferent ways of resin adsorption.By comparing the two ways of dynamic adsorptioneffect economic and environmental costs, the paper chooses to use hydrochloric acid topretreat D001resin.2.D001resin is choosed as evaluation index for saturated adsorptionamount of iron ions. The optimum technological conditions orthogonal experiment designoptimization D001resin pretreatment is5%HCl,5bv HCl,20, and the processing time is2h.3.The saturated adsorption resin is regenerated by using hydrochloric acid.The saturate-d adsorption amount of iron ions with resin is choosed as evaluation index, The optimalprocess conditions of the orthogonal experiment design optimization is D001resin regener-ation7%HCl,5bv HCl, regeneration temperature30, and regeneration time of3h.The continuous operation expanded experiment and repeatability research have beenstudied in chapter six. Through the expansion of repetitive verification test and repeatedverification test, under the best conditions of normal temperature, adsorption operationtime is about1h, regeneration agent is7%dilute hydrochloric acid,3BV hydrochloric acidsolution, regeneration time is3h. After regeneration, resin adsorption experiments may berepeated. reach saturation capacity close to that degree every time. resin regenerationstability stay75%above, and the resin have no breakage phenomenon throughout the cycle,and mechanical strength and reproducibility is better.