| 摘要 |
Suggested is a method for maintaining the ratio of the oxime to equilibrium modifier concentration in solvent extraction circuits, said solvents essentially consisting of (a) at least one ketoxime and/or aldoxime;
(b) at least one equilibrium modifier; and
(c) at least one diluent;
comprising the following steps:
(i) taking a sample of the plant organic, determining the copper max load and equilibrated strip point of the plant organic;
(ii) preparing a solution A of said component (a) in (c) to give a copper max load equivalent to that of the circuit organic, diluting small portions of the plant organic with solution A, determining the respective equilibrated strip point of each diluted solution and graphing the equilibrated strip point versus the degree of dilution of the circuit organic, where the degree of dilution of the plant organic is taken as 1, to create a calibration curve;
(iii) preparing a solution of the fresh reagent in component (c) having a copper max load (CuML) equivalent to that of the plant circuit organic and determining its equilibrated strip point (EqSP1);
(iv) determining the required dilution factor, D, by extrapolation from the graph using the equilibrated strip point for the fresh organic (EqSP1);
(v) calculating the volume V 2 in liters after dilution to which the circuit organic must be increased by using equation (1) V 2 = D * V 1
whereby V 1 stands for the volume of circuit organic in liters;
(vi) adding sufficient volume of oxime (a) and diluent (c) to be effectively equivalent to adding a volume of organic phase equal to V 2 - V 1 having a Cu ML equivalent to the circuit organic;
(viii) repeating steps (i) to (vi) as necessary. |
