In this present paper, chelating extraction of metals from spent hydrodesulphurization catalyst was carried out using ethylene diamine tetraacetic acid as complexing agent. Mo, Ni and Co metals were precipitated in ammonium molybdate, nickel dimethylglyoxime and cobalt hydroxide forms at pH:2, pH:6 and pH:10, respectively. The highest metal extraction yields (90.22% Mo, 96.71% Co, 95.31% Ni and 19.98% Al) were achieved under optimum process conditions. The activation energy values (E_a) of Co, Mo and Ni were calculated as 14.36 kJ/mol, 16.85 kJ/mol and 15.93 kJ/mol, respectively. It was determined that leaching kinetics fitted to the pseudo-first homogenous model and the chelating process was controlled by diffusion mechanism. In the light of the kinetic data, the kinetic equation including the process parameters was obtained as follows: \(\ln \left( {1 - x} \right) = 1.217 \times 10^{ - 4} [(C_{A} )^{1.068} \left( D \right)^{ - 0.929} (K/S)^{ - 0.850} (R)^{0.185} \exp ( - 6462.6/T)] t\). The results provided a new approach both for reducing the solid waste load of the petrochemical industry and for efficient recovery of metals from the spent hydrodesulphurization catalyst using EDTA.

本文以乙二胺四乙酸为络合剂，从废加氢脱硫催化剂中螯合萃取金属。Mo，Ni和Co金属分别以钼酸铵，二甲基乙二肟镍和氢氧化钴的形式在pH：2，pH：6和pH：10沉淀。在最佳工艺条件下，金属提取率最高（90.22％Mo，96.71％Co，95.31％Ni和19.98％Al）。活化能值（E _aCo，Mo和Ni的计算值分别为14.36 kJ / mol，16.85 kJ / mol和15.93 kJ / mol。已确定浸出动力学符合拟第一均质模型和螯合过程是由扩散机制控制的。根据动力学数据，得出包含过程参数的动力学方程，如下所示：\（\ ln \ left（{1-x} \ right）= 1.217 \ times 10 ^ {-4} [（C_ {A }）^ {1.068} \ left（D \ right）^ {-0.929}（K / S）^ {-0.850}（R）^ {0.185} \ exp（-6462.6 / T）] t \）。结果为减少石化工业的固体废物负荷和使用EDTA从废加氢脱硫催化剂中有效回收金属提供了一种新方法。