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.
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.

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.

[next]

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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