湿式亜鉛製錬における亜鉛末によるコバルトイオン除去に関する研究 (第2報)

抄録

In purification of ZnSO₄ solution on the wet process of electrolytic zinc, it has been thought to be diffcult to remove Co⁺⁺by zinc dust alone.
As reported in the 1st paper, zinc dust named “A type” was developed in Aizu Smelting Plant and this has ability to remove Co⁺⁺in ZnSO₄solution by zinc dust alone.
This zinc dust contains small amounts of Sb and Pb, and the cementation mechanism of Co⁺⁺by this zinc dust was reported in the 1st paper.
The object of this paper is to deliver the rate equation based on the cementation mechanism and to estimate the reaction rate in several cases. It may be concluded from the results of this studies that the cementation mechanism of Co⁺⁺ by zinc dust in the 1st paper is most adequate.
The reaction rate in this paper is estimated as follows.
log x₀-log x=a (1-at) t a=0.064hr^-1
x: concentration of Co⁺⁺
x_o: initial concentration of Co⁺⁺
a: rate constant; t: time
Constitution of rate constant (a)
a =a₁ (T₁-T_o) ⁿ=a₁ (T-45) ²;
T: temperature of solution
a =a₂Z^m=a₂Z^0.78; Z: amount of zinc dust
a =a₃p^l=a₃p^1/2; P: rate of Sb in zinc dust (%)
a =a_4·1/d; d: mean diameter of zinc dust.