The monomer and the continuum of minerals are the two basic forms of granules composed of ore and milled products. As the fineness of the grinding increases, the amount of monomer and the amount of continuous biomass in the product will rise and fall with each other. The ore-forming mineral evolves into a monomeric process under the action of external forces and is called mineral dissociation. The pulverization dissociation defined by Gordon 1939 refers to the coarse-grained continuum particles, which are crushed and ground into fine particles having a particle size smaller than the particle size of the constituent mineral crystals. Dissociation into monomers. At this time, because the binding force between different minerals is not destroyed, the fracture surface which causes the particle size to decrease often crosses the interface. The dissociation is the intermetallic formation of the continuum under external force. The common boundary is separated from each other. The dissociation is the ideal dissociation method expected by mineral engineering because it requires only a small amount of energy to achieve mineral dissociation. However, the mineral dissociation in the actual crushing and grinding process is often two. The method coexists and is mainly based on pulverization and dissociation. Because only the physical properties of adjacent minerals are very different, and the interface bonding strength is much smaller than the mineral strength of the two sides of the interface, it is possible for the mineral to preferentially separate from the interface under the action of external force. This type of ore is rare in nature. Gordon designed a simple ideal geometric model to illustrate the pulverization dissociation due to particle volume reduction. He envisaged that the ore test block consisting of P and G2 equal minerals is a cube with a length of 10 cm. The cube contains 1000 parallel-sized mineral crystals of equal size. These represent small square cubes of P and G minerals. The side length is 10 mm. In the orthorhombic ore test block, the two minerals are separated from each other and equidistantly arranged into a whole. When the ore test block is subjected to an external force, it will be broken into several square-sized cubes of the same size in a square grid manner. The square mesh fracture surface is parallel to the square mineral crystal plane but does not coincide (the coincidence is the dissociation). Figure 2-11-1 is a partial plan view of the model. The thin line is the interface boundary line of the mineral crystal, thick line Representative fracture surface can be seen from the figure, when the ore is crushed into particles cube side length of 10mm, all products are particles with the living body without monomers occurs only when the particles are pulverized into small particles 5mm square, products only part of the monomer occurs. Since the ore P, G 2-mineral same state, so in this case both the degree of dissociation of monomers are equal to 12.5%. it is not difficult to imagine, when the dust lump ore test 
FIG 2-11-1 pulverized dissociation geometric model
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