The kinetic of solution of yttrium hydroxide in HCl

The research of solution of rare earth hydroxide product of xenotime sand in HCl have been done. Yttrium hydroxide was the most content in the rare earth hydroxide product of xenotime sand The purpose of this research for determination of rate constant of solution reaction Yttrium hydroxide in HCl. The parameters was observed were temperature of reaction and concentration of Y (Y₀) in the rare earth hydroxide product of xenotime sand as feed. From the data reaction of reaction time and concentration of Y in HCl (Y) at the variation temperature and (Y₀) can be concluded that the rate constant of reaction was influenced by temperature of reaction and concentration of reactant. The all solution reaction of yttrium hydroxide in HCl was the second order reaction. The relation the second rate constant with temperature (1/T) as exponential function so the Arrhenius equation become k = 0,8954e^-87,7658/RT and can be expressed as linear function. - ln k = (1055.6/T) + 2.6088 with the linearity factor or correlation coefficient = 0.8954 From the calculation was obtained the value of activation energy 87.762584 kcal/mol.⁰K. The reaction of the second rate constant with (Y₀) as polynomial function k = -4.10^-5(Y)² + 0.0032 (Y) - 0.0194 with correlation coefficient = A = 0.9807. (author)