The main influencing factor of resin slurry technology - ion
2020-10-10 10:01Introduction：The main influencing factor of resin slurry technology - ion-exchange resin type Used for adsorption of gold and silver exchange resin from cyanide pulp are strongly basic anion exchange resin (such as AM, AB - 17, Amberlite IRA - 400, 717
The main influencing factor of resin slurry technology - ion-exchange resin type
Used for adsorption of gold and silver exchange resin from cyanide pulp are strongly basic anion exchange resin (such as AM, AB - 17, Amberlite IRA - 400, 717, etc.), weak basic anion exchange resin (such as AH - 18, 704, etc.), hybrid basic anion exchange resin (such as AM-2B, AⅡ-2, etc.).In terms of adsorption selection, weakly alkaline anion resin is superior to strongly alkaline anion resin, but it has low strength, poor adsorption kinetics and difficult desorption.In terms of adsorption kinetics, strong alkali anion exchange resin and mixed alkaline anion exchange resin are better.Widely used in the former Soviet union hybrid anion resin AM–2B, it is a kind of exchange of bifunctional macroreticular resin, skeleton for styrene and divinyl benzene copolymer and chlorinated methanol treatment crosslinking degree is 10% ~ 12%, the matrix contains 1:1 strong alkali quaternary amine group and the weak alkaline tertiary amine groups, the monomer can be represented as:
Its characteristic is: macroreticular, Moore Cl - exchange capacity of 3.2 (mg·mol)/g, particle size of 0.6 ~ 1.2 mm, specific surface area of 32 m2/g, depending on the density of 0.42 g/cm3, dry resin water expansion coefficient of 2.7, storage temperature is not lower than 5 ℃, water content of 50% ~ 58%.To remove acidic impurities, first soak 0.5% HCl or sulfuric acid solution of 3 ~ 4 times resin volumes and remove the foam of finely divided resin.This kind of resin has better selectivity, higher mechanical strength, better adsorption and desorption properties.
AB-17, Amberlite IRA-400 and domestic 717 resins have high mechanical strength and good adsorption and desorption kinetics, but they have poor adsorption selectivity for gold. Generally, the adsorption amount of gold only accounts for about 18% of the total adsorption capacity. The exchange capacity of amberliteira-400 to monocyanate complex is listed in table 5-14.
Table 5-14. Exchange capacity of Amberlite IRA-400 for monocyanate complex
|
metal |
Au | Ag | Ni | Cu | Zn | Co | Fe(Ⅱ) |
|
· Adsorption capacity/mg • g -1 |
659.1 |
340.8 |
106.9 |
82.1 |
81.6 |
76.3 |
48.8 |
