The design of the centrifugal concentrator of the ore dressing equipment is mainly for the drum, including the diameter, length and speed of the drum, followed by the selection of the control mechanism and the feeding device.
The length of the drum mainly affects the recovery rate. The drum is short and the recovery rate is reduced. The tin selection practice shows that the selection of the centrifugal concentrator with a diameter of 800mm is mainly in the o 40Gmm
This length of the drum is done on the drum. The length of the concentrate is higher, and the recovery rate accounts for more than 80% of the ore supply, accounting for more than 90% of the total concentrate. Industrially, when sorting low grade tungsten and tin, diameter 600 is selected from iron ore length of the drum of the centrifugal concentrator was 800 mm, length of the drum diameter centrifugal concentrator 1600 is 900mm, 2000mm in diameter The double taper centrifugal concentrator drum has a drum length of 1100 mm. It is not necessary to rotate the drum too long, and it is not good to hedge the stability of the concentrate and equipment. The drum slope is generally 3'-56. The slope is large, the concentrate yield is small, the grade is high, and the recovery rate is low.
The drum gradient of the centrifugal concentrator for rough selection and dressing equipment is less than the selected slope. The gradient of the drum can be designed as double slope or multi-slope, that is, the slope of the ore end is large. The magnetic separator of the ore dressing equipment is mainly classified according to the magnetic field strength of the magnetic field type, the magnetic field gradient, the sorting medium and the structural characteristics of the sorting mechanism. Constant magnetic field magnetic separator.
(1) The magnitude and direction of the magnetic field strength of this machine do not change with time. The magnetic source is a water long magnet or a DC electromagnet.
(2) Rotating magnetic field magnetic separator. The magnitude and direction of the magnetic field strength of the machine is always at any time, and the magnetic source is generally a permanent magnet whose polarity alternates around the sleeve.
(3) Alternating magnetic field magnetic separator. The magnitude and direction of the magnetic field strength of the machine change with time, and the magnetic source is an alternating current electromagnet.
(4) Pulsating magnetic field magnetic separator. The magnitude of the magnetic field strength of the machine changes with time, and its direction does not change. The magnetic source is an electromagnet that simultaneously transmits alternating current to direct current. The closed loop through which the magnetic flux is concentrated is called a magnetic circuit. The magnetic system of the magnetic separator needs to generate a magnetic field of a certain intensity, and requires that most of the magnetic flux in the magnetic field be concentrated through the sorting space. For this reason, a magnetic conductor in which a ferromagnetic substance is usually formed into a certain shape forms a magnetic circuit together with a sorting space. A coil is wound around a portion of the magnetic conductor, or the magnetic conductor surrounds the coil. Since the magnetic permeability of the ferromagnetic substance is much larger than that of air, most of the magnetic flux is concentrated in the path formed by the magnetic conductor. For the permanent magnet magnetic circuit, the energized coil of the above magnetic circuit is replaced with a hydromagnet.
Magnetic circuits and circuits are similar in form but have essential differences. Circuit is composed of larger conductive metal conductors formed of a closed loop, all of the current flow in the conductor; magnetic circuit is made large magnetic permeability constituting a closed conductor loop, in most of the magnetic flux loop by. At present, the demagnetizers used in production are all electromagnetic. The electromagnetic demagnetizer is a combination of several cylindrical coils with the same inner diameter and different outer diameters. The shape of the combined coil is a tower shape. The magnetic field characteristics of the electromagnetic demagnetizer are described by the change of the magnetic field strength on the axis of the tower coil, and the magnetic field strength is expressed by the maximum value of the magnetic field strength on the axis. In order to ensure a good demagnetization effect, the type and nature of the demagnetized product are required. Determine the appropriate magnetic field strength of the demagnetizer, the magnetic field gradient, and the stoppage of the magnetic product in the demagnetizer. According to the experience and data of production practice, the maximum magnetic field strength of the demagnetizer should be more than 5 times that of the mineral cohesive force, in order to achieve a good demagnetization effect. The ratio of the magnetic field gradient value to the maximum magnetic field strength on the demagnetizer axis should not exceed 5%. When using 50-cycle AC, ensure that the magnetic field is repeatedly turned 12 times or more, and the demagnetization time should be greater than. With these basic parameters, it is easy to determine the diameter of the demagnet working pipe by the flow rate and flow rate of the demagnetized product, the formulas (2-I 34) and (2-135), thereby determining the inner diameter of the demagnetizer and its Total length.
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