Vitrkele 912 (V912) is a new type of gold sorbent that binds metal chelators to fine-grained porous substrates such as glass or polystyrene for selective recovery of gold from solution. And remove a variety of functions such as toxic metals.
1. Recovery of cyanide with V912 adsorbent
V912 has long been used in North America to recover toxic metals from process waste. Recently, the Gabanintha gold mine in Meekatharra, Australia was tested with V912 to prove that V912 is a multifunctional adsorbent because it contains several ligands on the highly crosslinked polystyrene resin, so it It not only adsorbs cyanide, but also adsorbs many metal cyanide complexes. It is especially suitable for the recovery of metal cyanide, mainly because it is not susceptible to chemical pollution and is not easy to mechanically wear. Although the density and particle size of V912 are relatively small, even smaller than most of the adsorbents in the carbon slurry method, it can still reach good contact with the slurry in a very thick slurry, and the screening performance is also good.
For example, in a set of four mechanically stirred adsorption tanks connected in series, the tail liquid of the carbon immersion workshop 10 m 3 /d flows through the set of adsorption tanks and is discharged. The adsorbent taken out from the adsorption tank is sifted, washed with water, and then transferred to a desorption step for two stages of desorption, one for removing metal from the V912 adsorbent and the other for recovering cyanide.
When the eluate discharged from the cyanide desorption process is passed through a sealed tower vapour (operating under negative pressure), the rising air stream removes the cyanide from the HCN gas and transfers it to the adsorption column. Medium, where it is absorbed by NaOH to form sodium cyanide. The discarded eluate is discharged into the tailings pond. The Gabanintha gold selection plant proves that the V912 is not subject to significant chemical contamination and mechanical wear, and it is estimated that the new Vitrokele process is also significantly more economically efficient than other treatment processes.
Second, the use of Vitrokele adsorbent to recover gold
Vitrokele metal chelating agent ion exchange gold recovery process, also known as Devoe-Holbein (D-H) method, the process is similar to carbon slurry method (CIP) and resin slurry method (RIP), it is also known as VIP Law (Vitrokeleinpulp).
A new VIP gold extraction process developed by Dvor Holbein International. The company's patented process uses a successful, individually tested technology from Edward LeBelimann's Australian laboratory, which is investigating its production capacity at the Salcigen Gold Mine in France. There are 7 million tons of tailings containing 1.6 to 2.08 g/t of gold.
The initial direction of this new process research is for polluted water purification in the nuclear waste and metal processing industries, as well as gold recovery from solutions in the mining industry. This technology does not utilize bacteria or other organisms, but contains solid porous binders such as glass, polyurethane, polystyrene, etc., which can hold gold tightly (ligand). Different blends with unique selectivity and high regeneration rates can be produced according to different industrial uses. In June 1985, Dvor Holbein studied the addition of an effective, selective gold-carrying mixture and used it in tailings treatment.
The new blend utilizes both chemical and electronic technologies and is suitable for both heap leaching and slurry methods. Compared with the carbon slurry method, the recycling cost can be greatly reduced. If the inventor's wishes can be achieved, the new adsorbent has more advantages than the adsorbents used in the past, such as activated carbon and ion exchange resins.
In addition to its comparable capacity to gold and ion exchange resins in terms of gold loading capacity and adsorption kinetics, Dvor Holbein's new adsorbent also outperforms commonly used adsorbents in other properties. An extraordinary advantage of this new process is its high performance, that is, it can make the adsorption capacity of gold out of the economical value level from impure and mixed solution, and will not cause new pollution of adsorbent. And blocked.
The adsorbent is irreversible in the state of gold loading, which indicates that the chemical reaction is very favorable for the adsorption state. The carbon adsorption of gold depends on the concentration gradient of the adsorbent and gold in the solution.
The above two properties may be the main advantages of the new adsorbent plus. From the perspective of mass production, the controllability of repeated purification and recovery of the durability of the substrate is also of great practical value.
The recent semi-industrial trials conducted by Nedpac Engineering in Western Australia have proven to replace activated carbon as an adsorbent and have more technical and economic indicators than other gold extraction processes. Unfortunately, no specific data on this process has been provided so far, and no detailed industrial production reports have been reported.
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