SU1763017A1 - Method of jigging - Google Patents

Abstract

Usage: mineral processing. Essence: the boundary of the stratification of a material into a heavy and light fraction oscillates in time with the deposition cycle. The separation of fractions is carried out synchronously with the depositing cycle at the boundary of the stratification, which ensures minimal clogging of fractions 4 sludge.

Description

The invention relates to the field of mineral processing, in particular to methods for the separation of materials according to density.

The known method of jigging in air-pulsating jigging machines of the OM type is based on dividing the granular material into fractions according to density in a pulsating flow of water 1. With this method of jigging, the material is fed to the sieve into the separation zone, where heavy particles go to the lower layers and the lungs to the upper ones. The separated material enters the discharge zone, in which the heavy fraction is removed through the discharge horizontal slot and the collection pocket, and the light fraction through the overflow threshold. The quality of separation is ensured by the change in productivity during the unloading of the heavy fraction.

The disadvantage of the described method is low jigging efficiency, since in the discharge zone at the overflow threshold, the material to be separated is mixed, which leads to mutual clogging of the separated fractions.

There is a known method for separating material in an air stream in which the material is fed to a vibrating and air-blown stream. The material that is on the supporting sieve, under the influence of vibration and upward air flow, goes into a fluidized state. At a certain mode of oscillation of the support sieve and air velocity in the fluidized bed, the material is stratified into fractions according to density. To isolate the fractions obtained, a dividing plane is used, the position of which is established unchanged during the separation of the starting material. After the first separation, the upper layer of material is fed to an additional supporting sieve, where secondary separation of material into fractions 2 occurs.

The disadvantage of the considered method is the low jigging efficiency, since dividing planes having a fixed position cannot separate the material whose separation boundary

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It continuously changes during the jigging process.

There is a known method implemented in a jigging machine with a moving sieve, to which the starting material is fed. The sieve box communicates vertical fluctuations, the frequency, shape and amplitude of which, as well as the sieve slope affect the deposit of the source material. The separated material from the separation zone is fed to the discharge zone, where a heavy fraction is released through the discharge gap. The upper limit of the discharge gap is established by the signal of the float controlling the level of the heavy fraction in the compacted state of bed 3.

The disadvantage of the described method is the low jigging efficiency, since the level of the heavy fraction is measured in a compacted bed state, while unloading is performed continuously during bed pulsation. The aim of the invention is to increase the efficiency of the jigging process.

The goal is achieved by the fact that according to the proposed method, the material is fed to the sieve, the separating liquid is given pulsations (for a jigging machine with a fixed sieve) or oscillation to a sieve - for a jigging machine with a mobile sieve. In this case, the separation of the material into several fractions occurs, the separation and removal of the separated fractions synchronously with the deposit cycle at the boundaries of the separation.

The control of the interface between the fractions is carried out by a float, which, together with the dividing plane, moves during the jigging cycle.

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Figure 1 shows a diagram of the separation of material into fractions; Fig. 2 shows the oscillations of individual layers of the material being divided during the jigging process; Figs. 3 and 4 are a version of a jigging machine with a fixed sieve, where the starting material is fed to the jigging compartment 1 to the fixed sieve 2. Under the action of water pulsations, fractions are separated by density, the separation boundary of which, simultaneously with the jigging cycle, is monitored by the float 7 (in the position range 7 and 71) with the sensor 6, the signal from which is transmitted to the control system 8, which through the actuator 5, synchronously the float, moves the separator plane 3 (in the range of positions 3 and 3). Thus, the proposed method provides minimal mutual clogging of the fractions and allows the jigging process to be carried out in one section of the jigging machine.

As a result of the use of the proposed invention, the design of the produced multi-section air-water jigging machines is changed.

Claims (1)

Claims The method of jigging, including feeding the source material into the separation medium on a sieve, communicating pulsations of the separation medium or oscillations to the sieve, separating the material into several fractions, separating and removing fractions, characterized in that, in order to increase the efficiency of the jigging process synchronously jigging cycle at the boundaries of the bundle, which vary during the jigging cycle. . „- - 1 JXzZdt-JlC L. and Phi 1 .sEi.f FIG. 2 Jl vw t I Border divided I I compacted / moose / m / SUN pagffesetftj /) $ 0 p / evil ns by Bay I, & foHe Wu u 5 f TF + yLF Ap + yGR fig P1LG7