Although the above two results indicate a difference between the specific values ​​of the preferred strong base group content, both of them prove that the resin used for gold extraction should be a bifunctional resin, and the strong base group content has some kind The preferred range is very clear. And the difference between the two may mean that the composition of the solution used in the two sets of experiments is significantly different: for solutions with low bismuth metal content and relatively high gold content, it is advantageous to have a high base group content in the resin, so that the resin The gold capacity is higher and the adsorption amount of the base metal is not too high; on the contrary, when the gold content is low and the base metal content is much higher (such as the test and results of the former Soviet Union mentioned above), the bifunctional resin with high adsorption selectivity should be selected, among which The low base group content and comprehensive index are favorable for the adsorption of gold AM-2 resin, which is the best one of the bifunctional gold extraction resins at that time. Table 4  Characteristics of several strong base and weakly basic anion exchange resins [254] Types of Brand Matrix material Functional group Strong base group content /% Pore ​​structure Strong alkaline AM-П Styrene-divinylbenzene Quaternary amine 77~81 big hole AM Styrene-divinylbenzene Quaternary amine gel AB-17 Styrene-divinylbenzene Quaternary amine big hole A101DU Styrene-divinylbenzene Quaternary amine 　 IRA-400 Styrene-divinylbenzene Quaternary amine 　 717 Styrene-divinylbenzene Quaternary amine 　 Weakly alkaline AM-2Б Styrene-divinylbenzene Tertiary amine, quaternary amine 50 big hole AП-2 Styrene-divinylbenzene Tertiary amine 35.5 AП-3 Styrene-divinylbenzene Tertiary amine 27 365B Styrene-divinylbenzene Tertiary amine, quaternary amine 　 A378 Styrene-divinylbenzene Tertiary amine 16.5 IRA-93 Styrene-divinylbenzene Tertiary amine 5.8 AH-18 Styrene-divinylbenzene Tertiary amine 　 IRA-68 Acrylamine Tertiary amine 2.4 704 Styrene-divinylbenzene Tertiary amine, quaternary amine 　 A7 Phenolic secondary amine Secondary amine 0.6 A308 Epoxy polyamine Tertiary amine 14.7 A305 Epoxy polyamine Mixed amine 11.2 A260 Fatty amine Mixed amine 3 MG-1 Acrylic-divinylbenzene Mixed amine 3.9 Note: 1 mixed amines are mixtures of primary, secondary and tertiary amines, sometimes containing small amounts of quaternary amine groups. A comparative adsorption test was conducted on a weakly basic phenolic resin A7, a bifunctional resin IRA-93 and a strongly basic quaternary amine resin A101DU in a manually prepared cyanide solution of pH=11. The results are shown in Table 5. It can be seen from the table that the total exchange capacity of the three resins is the largest with A101DU and the smallest with A7; the selectivity to gold is best with IRA-93, and A7 is the smallest, they conclude that: a bifunctional group containing a certain amount of quaternary amine groups Weakly basic resin is currently the best gold extraction resin. Table 5  Adsorption partition coefficient of three kinds of resins Resin grade A7 IRA-93 A101DU metal Au 710 3230 18950 Ag 90 210 2210 Co 120 170 21170 Cu 20 100 3880 Ni 10 510 24400 Fe 115 240 4260 Zn 13370 1080 46000 ( Au+Ag ): Impurity 01:17.0 01:01.5 01:04.7
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The characteristics of anion exchange resins for the adsorption of gold from cyanide or slurry by the tests of the former Soviet Union, South Africa and China are shown in Table 4.
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