The magnetic separation process depends on the parameters of the selected magnetic separator and also on the characteristics of the ore being processed. The main properties of the ore that affect the magnetic separation process of iron ore beneficiation equipment are: the magnetic susceptibility of the selected mineral, the weight and relative grain size, the grain size characteristics, the content of the magnetic component, the moisture and the shape and state of the surface of the ore. The difference in the magnetic susceptibility of various minerals in the ore is the mineral sorting process in the magnetic field. When selecting a strong magnetic ore, the magnetization coefficient of the ferromagnetic mineral, for example, the magnetization coefficient of magnetite (X0≌80,000 x10-6) is more than its associated mineral quartz , ordinary hornblende, pyroxene and garnet. The specific susceptibility (X0 is below 20X10-5) is hundreds of times larger. When selecting other weakly magnetic minerals, magnetic components - hematite, soft manganese ore, manganese ore and wolframite marsh geometric susceptibility (X0 by the 25 × 10-6 to 300 x10-6 just over the non-magnetic minerals - quartz , limestone , etc. The specific magnetic susceptibility (X0 is less than 25 × 10-6). The ferromagnetic mineral has a high specific magnetic susceptibility. In most cases, in the magnetic field of the magnetic separator, The magnetic force on this mineral greatly exceeds the gravity. When dealing with weak magnetic ore, even in the magnetic field of a high-strength (magnetic field strength of 1800 Oersted) magnetic field, the magnetic force acting on the alkaline component exceeds the gravity one. Little, this is due to the fact that the magnetic susceptibility of magnetic minerals in ferromagnetic minerals is not large. The ferromagnetic minerals in the magnetic field of the magnetic separator are subjected to a large magnetic force, which can be used for the material to be treated and the hydraulic disturbance, and achieve high magnetic separation productivity. The larger the difference between the specific magnetic susceptibility of the magnetic mineral and the non-magnetic mineral, the larger the specific magnetic susceptibility of the magnetic mineral in the treated mineral stone, the easier the magnetic separation process is. The difference in specific gravity between the magnetic minerals and the non-alkaline minerals in the treated material also affects the magnetic separation process. Depending on the conditions of the magnetic separation process performed by various magnetic separators, although the specific gravity conditions are opposite, it may promote the separation of magnetic and non-magnetic minerals, and may also hinder the separation of magnetic and non-magnetic minerals. For example, in a magnetic separator with a magnetic direction opposite to the direction of gravity (or the component of gravity) (the magnetic separator of the lower ore feeding), the non-magnetic component has a large ratio (other conditions are the same), thus facilitating magnetic separation. process. The reason is that heavier non-magnetic particles are easily separated from the magnetic particles under the use of gravity. When the direction of the magnetic force is consistent with the direction of gravity (or gravity component) (the upper feeding belt type picker and the spiral groove type magnetic separator), the non-magnetic composition has a large ratio, which is not conducive to the separation of magnetic and non-magnetic minerals. Instead, it will hinder their separation. Because the selection process of the upper ore belt magnetic separator and the spiral groove magnetic separator is to flush and discharge the non-magnetic mineral by the flushing water flow, only the non-magnetic mineral with a small specific gravity contributes to the sorting process. Going on. The particle size of the material being processed is one of the most important factors affecting the magnetic separation process. The dry magnetic separation process of ferromagnetic ore can be used to treat materials with a particle size of 120 to 150 mm. The wet magnetic separation process of ferromagnetic ore and the dry and wet magnetic separation process of magnetic ore can be used to treat materials with a particle size of no more than 6-8 mm. The material to be treated increases its specific surface area as the particle size decreases, so that during dry magnetic separation, the ore particles increase the specific frictional force due to the adhesion of the ore particles to each other. If the direction of the magnetic force is opposite to the direction of gravity, the non-magnetic particles are no longer mixed into the magnetic portion together with the magnetic particles only when the gravity of the ore particles is greater than the friction between the ore particles due to the adhesion of the ore particles. Therefore, the minimum particle size of the material to be treated should be limited. Indicates the relationship between the result of the mixture of 50% hematite and 50% quartz and the particle size of the material. From this curve, when the particle size of the material is as low as 0.1-0.15 mm, the separation index (hematite content β% and recovery ε% in the magnetic portion) is greatly reduced. Plastic Coated Electric Kettle
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Several properties affect iron ore ore processing equipment (magnetic separator classification) the merits of the magnetic separation process