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Various types vein gold ore beneficiation process aspect Test Mineral Processing gold ore depending on its nature, processing methods used are different, but generally re-election, flotation, amalgamation, cyanide, and in recent years a resin-in-pulp, Carbon slurry adsorption method, heap leaching method for gold extraction. For some types of ore, a combined gold extraction process is often used.
The gold ore beneficiation test technical scheme is used in the production practice. There are many options for the gold selection process. The following are commonly used:
1. Single amalgamation
This process is suitable for the treatment of quartz vein primary deposits and oxidized ores containing coarse gold. Mercury amalgamation is an ancient and popular method of gold selection. In the modern gold industry production, the amalgamation method still occupies a very important position. Since gold is mostly in a free state in the ore, a part of the gold particles in various ores can be recovered by amalgamation. Practice has proved that the early recovery of a part of the gold particles by the amalgamation method in the gold selection process can significantly reduce the loss of coarse gold in the tailings.
Gold ore dressing test technical scheme The theoretical basis of gold amalgamation is that mercury can selectively wet the gold particles and then diffuse into the wet gold particles.
In water-based pulp, when mercury is in contact with the surface of gold particles, the contact surface formed by gold and mercury replaces the original contact surface between gold and water and mercury and water, thereby reducing surface energy and destroying the barrier gold. A hydrated membrane in contact with mercury. At this point, mercury rapidly diffuses along the surface of the gold particles and reduces the surface energy at the interface. Mercury then diffuses into the interior of the gold particles, forming a mercury-amalgam (mercury paste).
Gold ore beneficiation test technical scheme The amalgamation and gold extraction method is divided into two types: internal mixed mercury and external mixed mercury. The amalgamation equipment used has a mercury-mixing plate, a mercury-mixing chute, a skimmer, a mercury-mixing cylinder and a dedicated small ball mill or rod mill.
The process of amalgamation and gold extraction is simple, easy to operate and low in cost. However, mercury is a toxic substance and is very harmful to the human body. Therefore, the concentrator that uses mercury amalgamation should strictly abide by the safety technical operating procedures to minimize the harm of mercury vapor and metallic mercury to the human body.
2. Mercury-re-election joint process
This process is divided into two schemes: first, after remixing, and after re-election and then amalgamation. The first remixing process after mixing mercury is suitable for treating simple quartz veins containing gold ore. The first re-selection of the mercury-mixing process is suitable for the treatment of gold ore, but the surface is contaminated with oxide film and is not easy to directly mix mercury ore, and gold ore with low gold content.
3. Re-election (amalgamation)-cyanide joint process
This process is suitable for the treatment of quartz veins containing gold oxide ore. The ore is first re-elected, and the obtained concentrate is re-selected for mercury amalgamation; or the ore is directly mixed with mercury, and the tailings, graded ore, and mixed sand are separately cyanated.
4, a single flotation process
This process is suitable for the treatment of sulfide-bearing gold-bearing quartz vein ore and polymetallic gold-bearing sulfide ore and carbon-containing ( graphite ) ore with fine gold particles and high floatability.
5, gold ore dressing test technical program
Mercury-flotation combined process This process uses amalgamation to recover coarse gold from the ore and amalgamation tailings for flotation. This process is suitable for processing single ore-treated ore, gold-bearing oxidized ore, and ore associated with free gold. The use of this process has a higher recovery rate than a single flotation process.
6. Whole mud cyanidation (direct cyanidation) process
Gold is produced in quartz vein ore in the form of fine or fine particles dispersed. The ore is deeply oxidized and does not contain Cu, As, Sb, Bi and carbonaceous materials. Such ore is best suited for the full mud cyanidation process.
Cyanidation method is one of the main methods to extract gold and silver. Gold extraction in this way has the advantages of high recovery rate, strong adaptability to ore, and real estate gold, so it is widely used.
Cyanide gold extraction consists of four steps: leaching of gold-bearing ore in cyanide solution, separation of gold-containing precious liquid and leaching residue, precipitation of gold leaching and melting of gold mud. The shortcoming of this kind of gold extraction method is that cyanide is a highly toxic substance, which is easy to pollute the environment. In practice, it is necessary to strictly protect and control the environment.
7. Flotation-cyanide joint process
This process has the following three scenarios:
(1) Flotation - concentrate cyanidation process. It is suitable for processing gold and sulphide gold-bearing quartz veins close symbiotic ore quartz and pyrite ores.
(2) Flotation-baking-cyanide process. This process is suitable for the treatment of minerals that are free of cyanidation and contain only a small amount of gold.
8. Flotation-re-election joint process
This process is based on flotation, and is suitable for ore that is symbiotic with gold and sulfide and can only be recovered by smelting. It is also suitable for gold-bearing quartz vein ore with uneven coarse inlay and higher recovery than single flotation.
9, heap leaching
Heap leaching is a type of gold extraction by cyanidation, which is suitable for the treatment of ore with a lower gold content. The main advantages are simple process, low investment and low cost.
The above nine processes are principle processes and their internal structure should vary depending on the type and nature of the ore being treated.
Regardless of which type of ore, as long as it contains coarse gold, the principle of early harvest and overcharge should be implemented. Before the ore enters the flotation operation, the coarse gold should be recovered in time by re-election, amalgamation or single-slot flotation.
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