Accurate determination of zinc ion content in rust removal waste acid of steel by EDTA titration
In response to the problem of inaccurate determination of zinc ion content in the comprehensive utilization process of rust removal waste acid,a method of accurately determining the zinc ion content in rust removal waste acid by using pH control for settling ferric ions and EDTA titration is propoesd in this paper.Through polynomial fitting,the regression equation of the fitted curve for zinc ion content is obtained.The effect of Fe3+and Fe2+on the results is studied and analyzed,and solutions are proposed.It is also found that the addition of polyacrylamide(PAM)as a coagulant can accelerate the precipitation of Fe3+.This method can provide a basis for the comprehensive utilization of such waste acids.
Waste acidEDTA titrationZinc content determinationAmphoteric property of zinc hydroxideFitting curvePAM
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NSTL
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