Mechanical dissociation degree of ore:refers to the degree of separation of target minerals and gangue(impurities) in the ore.After crushing,the mineral particles exist independently,which is convinient for subsequent AI photoelectric sorting efficient separation.

Crushing is the premise to ensure the simple operation and low cost of the subsequent mineral processing process, and it is also the premise to ensure the low energy consumption of concentrate smelting. Hydrometallurgy such as leaching process only requires that the useful minerals can be effectively contacted with the leaching solution, but for the separation of high-grade concentrate, the minerals must be effectively dissociated before the subsequent leaching process can be carried out.

The situation of the gangue in the ore enveloping the useful minerals is represented in a gridded form. The useful minerals are divided into six small grids in the figure, and each small grid contains both useful minerals and gangue. It can be seen that even if the ore is crushed and ground finely, the complete dissociation of the minerals cannot be achieved. The small grids in the figure that contain both gangue and useful minerals are called medium ore, and only further grinding can achieve the dissociation of the medium ore. The ratio of the mass of monomer useful minerals to the total mass of useful mineral gangue is called the degree of dissociation. The degree of dissociation is high for ores with a weaker degree of combination of useful minerals and gangue, such as sedimentary rocks. However, for hard rock ores with a higher degree of combination of the two, the degree of dissociation is very low. The main reason for the low degree of dissociation of hard rock ores is that the content of useful minerals in monomer form in the ore is low and the mineral fracture during the grinding process mainly unfolds along the cracks of the ore, and the gangue content of the crushed product is still very high. For this type of ore, there are already many schemes to improve the degree of dissociation, such as applying external force at the mineral grain boundary to make the crushed product mostly monomer useful minerals.

In the above figure, area A represents useful minerals, and area AA represents useful minerals associated with gangue. The right side of the figure shows the composition of the ore after crushing: Type 1 is mostly useful minerals, with a low gangue content, and is a concentrate; Type 2 and Type 3 are medium ore, and the economic efficiency of re-crushing of Type 3 is better than that of Type 2; Type 4 is mainly gangue, with a very low content of useful minerals, and is a tailings.

In actual production, the best mineral dissociation degree is generally determined through laboratory tests and semi-industrial tests, and on this basis, a suitable industrial mineral processing technology is designed. The specific indicators for testing industrial mineral processing production are: the concentrate is mainly composed of useful minerals, and a certain amount of middlings and gangue containing useful minerals is allowed; the tailings are mainly gangue.