SU1213198A1 - Method of averaging loose materials - Google Patents

Description

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The invention relates to ore processing, and more specifically to methods for averaging the qualitative composition of bulk materials, and can be used in the mining, chemical, food and other industries.

The purpose of the invention is to simplify the management of the averaging process, to ensure the continuity of the operation of the bunkers and to stabilize the mode of their loading.

The system that implements the proposed method contains a switchgear (depending on the monitored indicator, this can be a chain of screens, electromagnetic separators, nuclear-physical analyzers, etc.) and a system of dosing bins that are equipped with material level sensors (for example, rotary type), which can be installed either in a chain across the entire height of the bunker, or in a single instance with the possibility of movement in height. The sensors are electrically or mechanically connected to variable output feeders (for example, belt, screw). A collecting conveyor is used to combine the output streams.

The method is implemented as follows.

The initial material flow enters the distribution device, where it is divided into qualitatively heterogeneous flows. Each stream enters its intended bin in the quantity in which it is present in the original material flow. During the loading process, the material is transmitted to the sensors, transmitting information about the amount of material loaded into each bunker. Simultaneously with the loading, the system is unloaded. At the same time, the performance of the feeders is unchangeable in accordance with the signals from the sensors, and the intensity of each output stream is all, the time remains proportional to the amount of materials in the corresponding bunker (in the particular case proportional to the level of material). On the conveyor, the output streams are combined to form an average material flow.

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This mode easily reduces the amplitude, and in a number of cases it smoothes the high frequency of the initial oscillations, thereby providing an increase in

flow homogeneity. The stability of the output flow is close to the averaging indices of the so-called ideal mixers (pulsators), but this is achieved much easier for any materials. The method can be implemented in another mode.

In the initial position, all bins are empty. Start the system boot and

continue until the material level in one of the bins reaches the upper limit position. The loading is stopped, the sensors are brought to the surface of the material and

they occupy the original position. In this position, the sensors measure the amount of material in each bunker and determine the performance of each feeder. Turn on boot feeders and start loading again. The initial material level is lowered, being covered with layers of new feed material. As it descends from the starting position

the difference in levels gradually decreases as the feeders do not change their performance. The levels are located in intermediate positions, and by the time they arrive at the feeds are completely aligned. At the moment of exit of their hoppers, the newly loaded material occupies a different position. Sensors are shifted to this position, and feeders change their

performance according to new material level data. The next averaging cycle begins. Thus, the difference of this mode from the previous one is

The fact that the capacity of the feeders does not vary continuously, but is discrete and is kept constant for each averaging cycle.

The proposed method allows to significantly simplify the averaging process in dosing and mixing systems and ensure their uninterrupted operation in at least two different modes, which makes them very convenient for a wide variety of technological processes. This method ensures the constant quality of the composition of the output stream.

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even in the presence of special controlling devices at the outlet of the dosing-mixing system. The method does not require the continuous measurement of the quality of the output stream in the case of deviation from the required value of the adjustment in the operation of the bins. The uniformity of the output stream is achieved only by the dependence of the discharge capacities of the bunkers on the amount of material in the bunker. A system operating according to the inventive method is practically inertialess, since the output flows of the bins at the point of their combination are always mixed in optimal proportions. In the known methods, from bunker feeders to the quality control point of the total flow, the material goes some way and, therefore, if a deviation is detected in the output flow and instantaneous adjustment of the performance of the feeders, material of a distorted quality arrives for some time, i.e. such methods are inertial.

In those cases when the flow dispatched from the conveyor must be constant in performance, the performance of each feeder must be chosen taking into account the total

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performance. However, this condition is not always necessary, for example, when unloading a bunker system into wagons.

5 With multi-component averaging, the method must be applied as many times over as many components are averaged. In addition, each subsequent stage serves to average the material over the next component. In this case, the number of bins used is equal to the total number of intervals of all components. For example, for the three components, separable

15 in terms of four bays, 12 bins are required. This drastically reduces the number of bunkers used, since otherwise (a single averaging is simultaneous over all components), the number of bunkers is equal to the number of all possible combinations of the contents of all components (for example, for the three components divided by content

25 into four intervals, 64 bins required.

If one of the monitored indicators of the quality of a material is its composition, then averaging

30 by size is held last in order to avoid possible averaging in the process of unloading from the bunker at the previous stages.

Claims (1)

METHOD FOR AVERAGING BULK MATERIALS, including dividing the initial material flow into flows according to the content of the controlled component, loading the resulting flows into metering bins, their subsequent unloading into a combined stream, characterized in that, in order to simplify the control of the averaging process, stabilize the loading mode of bins and ensure the continuity of their work, the unloading of each hopper into the combined stream is carried out with a capacity proportional to the quality of the material in the hopper. ^{1 12}