Ion exchange resin for extraction and adsorption of gold cyanide

&Nbsp; Activated carbon is traditionally used to adsorb gold
Precious gold will be adsorbed on the surface by activated carbon, and then washed or burned directly to recover gold
The use of ion exchange resin for recovery * has many advantages over activated carbon, because through the special manufacturing process, we can place selective ions on its structural effective functional groups to selectively adsorb this precious metal
Therefore, due to its economic advantages, ion exchange resins are widely used for * recovery
Most of them use anion exchange resin to exchange adsorption *& Nbsp& Nbsp& Nbsp& Nbsp; In the process of extracting gold with cyanide, gold will exist in the form of anionic gold cyanide, namely Au (CN) 2-; Then it is recovered by anion exchange resin of strong base or weak base
Such as   Tulsion®& Nbsp; A-21s (strong base), tulsion®& Nbsp; A-27mp (strong base) and tulsion®& Nbsp; A-2x MP (weak base)
(a) Application of strong base ion exchange resin: this type of strong base anion resin has a functional group of quaternary ammonium
In high pH solution, Au (CN) 2- is adsorbed by exchanging the opposite ions of chloride ions; The reaction mechanism is as follows: xxxnr3 *x + Au (CN) 2- & Nbsp----& Gt& Nbsp; XXX NR3 * Au (CN) 2 + x then washes the adsorbed gold with stronger anion resin or other chemical reactions
Usually, the most economical alternative reaction is to wash gold out with zinc cyanide or thiocyanate, as follows: xxxnr3*au (CN) 2 + scn+ & Nbsp----& Gt; Xxxnr3*scn + Au (CN) 2xxxnr3*au (CN) 2 + Zn (CN) 42+ & Nbsp----& Gt& Nbsp; [xxxnr3*]2 Zn (CN) 4 + 2 Au (CN) 2 no matter what method is used to wash out the gold complex, the strong acid anion resin must be finally converted back to the sulfate type with sulfuric acid or ferric sulfate to facilitate the next reaction mechanism mode of gold adsorption
The reaction mechanism replied is as follows: xxxnr3*au (CN) 2 + SC (NH2) 2 + 2h2so4 --& Gt& Nbsp; Application of xxxnr3*hso4 + 2 hcn+[au{sc (NH2) 2}2]+hso4-b) weak base anion exchange resin: the other is weak base anion exchange resin
Since this weak base anion resin exists in the form of free radicals, it must be treated with acid before being used to adsorb gold
The reaction mechanism is as follows: xxxnr2 + hx ----& Gt; Xxxnr2h*x- Xxxnr2 h+x + Au (CN) 2 ----& Gt; Xxxnr2 h+au (CN) 2 +xxxnr2h+au (CN) 2 + naoh ----& Gt; Xxxnr2 + na+au (CN) 2 + H2O because of the high exchange capacity of ion exchange resin and the high processing capacity, for the small operating system mode, incineration is usually used to replace washing to collect gold back and forth
Tulsion®& Nbsp; A-21 s is a strong base anion exchange resin with polystyrene structure
It has a special ammonium functional group with superior chemical properties, and has excellent operating performance due to its natural crack free characteristics
It has excellent operating performance for weak acids, strong inorganic acids and halides
It is widely used in gold mining, electroplating, waste electronic recovery and other industries
It has the advantages of high exchange capacity, low leakage and strong selectivity
It can even extract and adsorb gold cyanide in the environment of cobalt and nickel

Typical characteristics:   Tulsion®& Nbsp; A-21 s & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Type /type & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Strong base anion exchange resin& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Cross linked polystyrene physical form& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Moist spherical beads ionic form & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Chlorine /chlorine total exchange capacity & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 1
3 meq/ml mesh /screen size USS (wet)  & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 16 to 50 particle size & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 0
3 - 1
2 mm humidity /moisture content & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 54± 3% pH range /ph range & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 0 - 14 backwash density /backwash set density & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 42 - 44lbs/ft3 (670 - 710 g/l) solubility & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Insoluble in all common solvents
Typical operating conditions:   Tulsion®& Nbsp; A-21 s & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; Max operating temperature & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 60 ℃ resin bed height /resin bed depth & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 800 mm maximum service flow & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 60 m2/hr/m2 backwash expansion space & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 60 - 75% backwash flow rate & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 5 - 10 m/ Hr/m? Regenerant ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; NaOH regeneration level & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 40 - 160 g/l regenerant concentration & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 4-5% regeneration flow rate & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 5- 10 m/ Hr/m? Regeneration contact time & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 30-60 min regeneration slow flow rate& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 2 bv minimum slow rinse flow rate & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; At regeneration flow rate /fast & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; At service flow rate /fast rinse volume & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp; 4- 6 BV