SU437955A1 - Apparatus for determining the concentration of magnetite in iron ore dressing products - Google Patents

Description

one

The invention can be used in laboratories and at magnetically concentrating factories to control magnetite in a stream of magnetic separation tails.

Devices are known for determining the concentration of magnetite in iron ore dressing products, which contain sensing and compensating coils connected to each other, measuring and correcting amplifiers with reversible electro-motors, on one magnetic core. gattel at their exits.

However, such devices, due to the instability of the parameters of the coils, the magnetic core, and the mains, have a zero drift and low accuracy when measuring the enrichment products of iron ores having a low magnetite concentration.

The purpose of the invention is to improve the accuracy of determining the concentration of magnetite.

This is achieved by the fact that the device is equipped with a non-magnetic metal, for example brass, plate attached to elements rigidly connected to the shaft of the reversible electric motor at the output of the correction amplifier, and the correction amplifier and the reversible electric motor at its output are connected to a voltage source that is out of phase 90 ° relative to the network.

FIG. 1 shows schematically the structure of a sensor; FIG. 2 is a circuit diagram of the proposed device.

The proposed device includes a magnetic core 1, primary coils 2, sensing 3 and compensating 4 coils, a slurry pipeline (cuvette) 5, a recording device consisting of a measuring amplifier 6 with a reversing electric motor 7 and a working induction coil 8, and a correction amplifier 9 with a reversing electric motor 10. On the motor shaft 10 through rigidly connected elements.

And a non-magnetic metal plate 12 is attached.

Measuring amplifier 6, reversible

electric motor 7, primary coils 2 and

The working induction coil 8 is connected to the mains voltage, and the corrected amplifier 9 with a reversible electric motor 10 is powered from a voltage source that is out of phase φ by 90 ° relative to the mains.

Counter-switched coils 3 and 4 are connected in series with the secondary windings of the working induction coil 8 and with the capacitor 13. The unbalance voltage taken from the capacitor 13 is fed simultaneously to the measuring 6 and the correcting 9 amplifiers.

Magnetite in the slurry pipeline increases the magnetic flux passing through the sensing coil. The emf caused by the increase in this flux is fed to a recording instrument that captures the magnetite concentration.

The imbalance in phase at the output of the sensing and compensating coils, resulting from the instability of the parameters of these coils, the magnetic core and the supply network, causes a voltage component that is out of phase relative to the mains to be 90 °. This voltage is applied to a correction amplifier, the reversing motor of which, by moving the metal plate over the sensing and compensating coils of the magnetic circuit, eliminates the nonidentity of active losses, automatically eliminating the unbalance at the output of these coils.

Subject invention

A device for determining the concentration of magnetite in iron ore enrichment products, containing sensing and compensating coils, facing one another, measuring and correcting amplifiers with reversible electric motors at their outputs, in order to improve the determination accuracy, the device is equipped with non-magnetic metal eg a brass plate attached to elements rigidly connected to the shaft of a reversible electric motor at the output of a correction amplifier, and ruyuschy amplifier and a reversible electric motor at its output connected to a voltage source, shifted in phase by 90 ° with respect to the network.

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