Mineral relative grindability, mineral interface bonding strength, and mineral particle strength

November 09, 2024

In order to analyze the effects of grindability, strength and other factors on mineral dissociation, Malvik (1982) conducted experimental studies on two groups of minerals with different properties. A group of lower intensity grindability minerals: sphalerite, yellow copper ore, galena; is a group of high strength is difficult to mill minerals: pyrite, hematite, magnetite, pyrrhotite . The test results show that, in terms of the particle size of the grinding product, the dissociative, low-strength, low-hardness minerals can be quickly and completely dissociated under the condition of coarse grinding fineness. At this time, if fine grinding is performed again, as the fineness of the product grinding decreases, only the dissociation degree of the mineral at the coarse particle level is continuously reduced. As the product is further finely ground, the coarse-grained, easily millable mineral monomer will enter the fine fraction faster than its continuum. The case of difficult-to-grind minerals is different from it. It is generally impossible to make the hard-to-grind minerals dissociate in the initial stage of grinding. Therefore, when the fineness of the product grinding falls due to re-grinding, with the continuous organism Dissociation of minerals, the degree of monomer dissociation of such minerals in the coarse fraction will increase. Figure 2-11-5 shows the effect of the relative grindability of minerals on mineral dissociation with two opposite-order particle size dissociation curves.

Figure 2-11-6 is a plot of Malvik used to characterize the dissociation of mineral particle binding strength. When the particle interface bonding strength is greater than the particle's own strength, the product is finely ground again, and the first pulverized will be the dissociated monomer. However, the continuous body is more retained due to the higher mineral bond strength. Therefore, the dissociation of coarser-grade minerals will decrease as the fineness of the product is reduced. If the interfacial bonding strength of the ore-forming mineral is smaller than the particle's own strength, the mineral dissociation degree of the grinding product is coarser than that of the product. Since the broken particles are subjected to an external force at this time, the particles are preferentially separated from the mineral interface, so that a different result from the previous one occurs. When the properties of the two minerals are different and the strength is equal, the degree of mineral dissociation of each coarse fraction of the product is naturally a constant independent of the fineness of the product.

Electric Wire Rope Hoist

Eurocrane electric Wire Rope Hoist increased the hook working area with its compact design.Increased the utilization of limited factory space.Crane system with Eurocrane electric hoist can effectively reduce the weight of the equipment to reduce power consumption,and the operating noise is lower than the requirement of international standard.Hence it is known as an equipment with comfort of operation,economicalcost,and low energy consumption.Eurocrane wire rope hoist has four types,including fixed type,low headroom trolley type,normal headroom trolley type and double girder trolley type.

Electric Wire Rope Hoist,Electric Wire Rope Hoist With Trolley,Wire Rope Hoist,Eelectrical Wire Rope Hoist

Eurocrane (China) Co., Ltd. , https://www.eurocranepart.com