Study On Removal Of Chloride Ions In The Zinc Sulfate Solution And Immobilized Antichlor

There are series of questions in the process of zinc hydrometallurgy because chlorideconcentration was seriously overweight in the zinc sulfate electrolyte leaching from zinc ore,such as, and electrode was fast corroded by, thus, the quality of electrolytic Zinc productdecreased significantly, the conditions for environmental technology were contaminated bythe high chloride concentration and other issues.In the paper, firstly, the liquid-liquid ionexchange was proposed to remove chloride ions in solution of zinc sulfate. Then furtherexplored the immobilization and screening for tertiary amine as extractant to prepare specificfunction ion exchange resin for adsorption chlorine ions. Finally, there were different tertiaryamines immobilized acetyl chloride polystyrene resin that used for the adsorption of chlorideions in the solution of zinc sulfate, in order to achieve solid-liquid phase separation forchloride ions and zinc sulfate electrolyte.In the study on the liquid-liquid ion exchange, take zinc sulfate solution as inorganicphase, tri-n-octylamine as exchange agent, solvent oil as diluent, resulting in organic phase.During the mixing of the two phases, the chloride ions got into the organic phase frominorganic phase and formed tri-n-octylamine hydrochloride to achieve a liquid-liquidseparation of chloride ions. The study found that mixing aqueous solution of tri-n-octylaminehydrochloride with a concentration of sulfuric acid, and chloride ions on tri-n-octylaminehydrochloride and sulfuric acid hydrogen in the aqueous solution can exchange, in order toachieve elution and circulation for tri-octylamine. The recycling and regeneration of thetri-n-octylamine was actually the process that the conversion of tri-n-octylamine bisulfate andtri-n-octylamine hydrochloride.In the study tertiary amine was immobilized, selected chloroacetyl polystyrene asskeleton, the tertiary amines of four different number of carbon atoms were selected asfunctional groups. Four tertiary amines were triethylamine, tri-n-butylamine, tri-n-hexylamineand tri-n-octylamine. The paper studied the amination reaction of chloromethylated polystyrene resins and four kinds of tertiary amines under the same reaction conditions. Itsdifference of solid carrier preliminary could be characterized by changes of weight gain,disubstitution and loading amount of the resins. and further characterized by IR spectroscopyand elemental analysis instruments. The study found that degree of difficulty when thedifferent carbon number of tertiary amine immobilized in chloroacetylated polystyrenebackbone, which did not fully comply with the report in the literature, such as the results oftri-n-hexylamine immobilized was poor than tri-n-octylamine.In the study on solid-liquid separation, first, four kinds of quaternary ammonium resinwere transformed from chlorine-based resin to acid type resin, and then exchanged chlorideion with zinc sulfate electrolyte. Finally, eluted the resin that absorbed chloride ions to recycle.The study found that the property of which different immobilized tertiary amine resinadsorbed chloride ions in zinc sulfate solution depended on the amine loadings size, and itwas not obviously related to the type of amine.The results showed that the process of liquid-liquid ion exchange removed chloride ionsin zinc sulfate solution for hydrometallurgy electrolyte was best, but the loss of solvationeffects and harm caused by tri-n-octylamine also should be took in consideration. Althoughthe immobilization and dechlorination effects of three triethylamine chloracetylatedpolystyrene resin were the best, but the amount of solid carrier was low. It is difficult toachieve the amount of solid carrier and the effect of dechlorination that the process required,so how to increase loading amount of of the tertiary amine also needs further study.