Various types of gold ore have different beneficiation methods due to their different properties, but gravity separation, flotation, amalgamation, cyanidation, and recent resin slurry method, carbon slurry adsorption method, and heap leaching method are commonly used to extract gold. craft. For certain types of ores, the combined gold extraction process is often used.

     Gold ore beneficiation test technical scheme

     There are many gold selection process schemes used in production practice, and the following are usually used:

      1. Single amalgamation

     This process is suitable for processing primary deposits of quartz veins and oxidized ores containing coarse-grained gold. Gold extraction by amalgamation is an ancient and common method of gold selection. In modern gold industrial production, the amalgamation method still occupies a very important position. Since gold mostly appears in a free state in ores, some gold particles in all kinds of ores can be recovered by amalgamation. The practice has proved that using the amalgamation method to recover part of the gold particles in advance in the gold beneficiation process can significantly reduce the loss of coarse-grained gold in the tailings.

      2. The Combined process of amalgamation and gravity separation

     This process is divided into two schemes: first amalgamation and then re-selection and first re-election and then amalgamation. The process of amalgamation followed by gravity separation is suitable for processing simple quartz vein gold-bearing ores. The amalgamation process after gravity separation is suitable for processing ores with large gold particles, but the surface is polluted and coated with an oxide film, which is not easy to be amalgamated directly, and placer gold ores with low gold content.

     3. The Combined process of re-election (mercury mixing)-cyanide

     This process is suitable for processing gold-bearing oxide ores in quartz veins. The raw ore is re-selected first, and the concentrate obtained from the re-selection is amalgamated, or the raw ore is directly amalgamated, and the tailings, graded ore, and mixed sand are cyanided separately.

     4. Single flotation process

     This process is suitable for processing sulfide gold-bearing quartz vein ores, polymetallic gold-bearing sulfide ores, and carbon (graphite) ores with finer gold particles and high buoyancy.

      5. The Combined process of amalgamation and flotation

     This process is to use amalgamation to recover the coarse gold in the ore, and the amalgamation tailings are used for flotation. This process is suitable for processing single-flotation ores, gold-bearing oxide ores, and ores with associated free gold. The recovery rate obtained by this process is higher than that obtained by a single flotation process.

     6. Full mud cyanidation (direct cyanidation) process

     Gold is produced in the quartz vein ore in a fine-grained or fine-grained dispersed state. The ore is highly oxidized and does not contain Cu, As, Sb, Bi, and carbonaceous substances. Such ores are most suitable for the full slime cyanidation process.

     7. Combined flotation-cyanidation process

     (1) Flotation - concentrate cyanidation process. It is suitable for processing gold-bearing quartz vein ores and quartz pyrite ores that have a close symbiotic relationship between gold and sulfide.

     (2) Flotation-roasting-cyanidation process. This process is suitable for the treatment of minerals that contain floatable minerals that are harmful to cyanide, and only a small amount of gold is bound to this mineral.

      8. Combined flotation-reelection process

     This process is mainly based on flotation, which is suitable for ores where gold and sulfide are closely symbiotic and can only be recovered by smelting. It is also suitable for gold-bearing quartz vein ore with uneven distribution of rough accumulation and a higher recovery rate than single flotation.

      9. Heap leaching method

     Heap leaching is a type of gold extraction by cyanidation, which is suitable for ores with low gold content. The main advantages are a simple process, less investment, and low cost.

     No matter what kind of ore, as long as it contains coarse-grained gold, the principle of early harvest and more should be implemented. Before the ore enters the flotation operation, the coarse-grained gold should be recovered in time by gravity separation, amalgamation, or single-cell flotation.