研究了110—160℃及po_2<4900 kPa条件下,硫酸溶液中γ-NiS(针镍矿)氧化浸取动力学。浸取速率过程可用表面无固体生成物沉积的核心收缩模型描述,如 1-(1-α)~(1/3)=(k/ρr_0)t=Kt浸取速率在pH<2.5时,与H~+浓度无关;pH>2.5时,为pH值的一个函数。浸取反应对氧分压来说为0.5级。反应的表观活化能为97.5kJ·mol~(-1),pH<2.5时,上式中的速率常数可表示为 K=1.45×10~5(4.55+1/(?)_0)P_(O_2)~(1/2)[H~+]~(?)e~(-11720/T)溶液中少量Cu~(2+),Ag~+的存在,降低了对γ-NiS的浸取速率。
The kinetics of oxygen leaching of synthetic γ-Nis, or milerite, in dilute H_2SO_4 solution under oxygen pressure, below 4900 kPa, at the temperature range from 110 to 160℃ was studied. The leaching rate can be described by an unreacted shrinking core with no solid product formed on the surface. The rate of reaction can be reflected by the following equation: 1-(1-α)~(1/3)=(k/ρr_0)t=Kt The rate Constant K in the above equation can be expressed as: K=1.45×10~5(4.55+1/(?)_0)P_(O_2)~(1/2)[H~+]~(?)e~(-11720/T) The reaction rate will be retarded by tbe Cu and Ag ions in solution.
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