Grinding fineness gap and adjustment

1. Particle size The so-called particle size is a measure of the size of the ore (block ore). The ore mixture is divided into several particle sizes according to the particle size. These levels are called the particle size. The relative content of each particle size in the particle size mixture is called the particle size. composition. In the process of flotation process, in order to ensure high technical index of flotation, it is important to study the influence of ore size on flotation and determine the optimal inclusion size and other process conditions based on the ore properties.

Second, the impact of particle size on flotation Flotation not only requires the dissociation of mineral monomers, but also requires the appropriate inclusion of particle size. The ore is too thick, even if the mineral has been dissociated from the monomer, it will not float because it exceeds the floating capacity of the bubble. The upper limit of the flotation particle size of various minerals is different, such as 0.2-0.25 mm for sulfides and 0.25-0.3 mm for non-sulfurized ores. For some of the less dense non-metallic minerals, such as coal, grain size can be increased. However, the minerals are too finely ground, and the 0.01 mm mineral particles are also not well floated. Practice has also shown that the flotation behavior is different for different particle sizes. Table 1 lists the flotation of lead-zinc ore in industrial conditions, the recovery of various size.

Table 1 Recovery of various grades of lead and zinc in flotation under industrial conditions

The data in Table 1 shows that different minerals have their optimal flotation particle size range. The inclusion of too coarse particle size (0.1mm in size) and very fine ore particles (less than 0.006mm) are not conducive to flotation, and the recovery rate is low. In the production process, the particle size change of the ore into the flotation is measured in time, and the adjustment basis is provided for guiding the grinding and grading operation, which is the inspection work to be carried out in each class on the site every day. In the absence of automatic measurement of particle size and automatic adjustment, rapid screening is generally used. The tools used in this method are balances, concentration pots and sieves (0.074mm or 0.15mm, etc.). Once every 1 to 2 hours, you can grasp the granularity of the selected ones in time, and the application is very convenient. According to the change of the selected particle size, the operating conditions of the grinding and grading cycle are changed in time, such as adjusting the ore feeding rate, grinding concentration and grading concentration of the grinding machine.

At the same time, the granular composition of the flotation concentrate and tailings can be checked, and the change of the fineness can be found. For example, the loss of the coarse-grained grade in the tailings increases, that is, the so-called “running rough”, indicating that the grinding fineness is insufficient; if the loss is It is a fine-grained grade, which means that it is too fine, which requires timely adjustment of the process conditions of the grinding and grading operation. Both coarse and fine particles (0.010 mm) have many special physical and physicochemical properties. Their flotation behavior is different from that of a general particle size, and therefore, special process conditions are required during the flotation process.

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