Question

Cyanide process is used for the concentration of:
A. Au
B. Ag
C. Al
D. Fe

Answer 1

The process of cyanidation is also called the industrial process or the MacArthur-Forrest process, is a hydrometallurgical technique for extracting the metal from low-grade ore by converting the it to a water-soluble coordination complex.

Complete step by step answer:
Cyanide are useful to extract gold, either in a very controlled mill environment, or more crudely on rock piles within the open. Cyanide "vat leaching" mixes finely crushed ore with a cyanide salt in water. The cyanide binds to the gold ions, and makes them soluble in water, thereby allowing separation from the rock.
Cyanide process could be a technique for extracting gold or silver from low-grade ore by converting the gold or silver to a water soluble coordination complex.

The industrial process is as explained below-
The ore is grounded and crushed. If the ore containing the gold has other styles of metals or any reasonably sulphide minerals then it requires additional quiet treatments before researching the method of leaching. The gold is mixed with the cyanide which ends up in the subsequent Elsener’s equation and reaction. this can be done to create soluble gold
Now the gold is soluble. This method of creating soluble gold is thought as leaching. Within the process of leaching, a dilute type of cyanide is added into the ore containing the gold. Since gold is soluble after the leaching process, it's liberal to move through the membrane while the remainder of ore cannot labor under the membrane. Lime is added to cyanide to form the pH in between 10-11 to favour the reactants and produce them to equilibrium.
The slurry formed is then treated with the activated zinc or carbon for the extraction of gold. Cementation is the next process which involves the employment of zinc electrodes with a paste of carbon immersed within the solution containing the gold cyanide.
So, the correct answer is “Option A and B”.

Note: As Gold and silver are not soluble in water therefore cyanide is used which stabilizes the gold and silver species in solution, and an oxidant such as oxygen is required to dissolve the metals.