SU827784A1 - Method of breaking ore with electric current - Google Patents

Description

In order to carry out the method, two electrodes are placed on opposite sides of oversize, which are connected to the pinhole of a punctured one-wavelength voltage and a low rectified voltage of high rectified voltage for high power. 1 The source of breakdown voltage of the breaking voltage is connected to each other with one polarity and separated by diodes connected in the circuit of the source of breaking voltage, according to reference.

The iB circuit of the source of breakdown voltage is established by a regulator, for example, with phase voltage regulation. The signal for voltage reduction comes from a current sensor, calculated as a response at the boundary current. As soon as the current in the channel of the sample increases to the limit value, the current sensor gives a signal to turn on the servomotor to regulate the voltage of the phase controller in the direction of decreasing. With a reduced breakdown voltage, the breakdown current is reduced. iKaK only oi reaches the limit value, the phase regulator turns off the servo drive, with a new increase in the current, the phase controller again decreases the voltage across the voltage.

Using the half-wave as the breakdown voltage allows, on the one hand, to have a high amplitude voltage for the breakdown, which at the same time is pulsed (it is known that the initial breakdown occurs more intensively in the pulsing mode than with a constant voltage supply) On the other hand, half-wave and voltage can produce an average current equal to half the current rectified or alternating.

The reduced average value of the current allows it to withstand a longer time, which allows the creation of a channel of the sample.

In order to be able to reliably pick up a channel by a powerful low voltage source, it is necessary that the resistance of the channel to the sample is sufficiently small.

In order to increase the efficiency, the breakdown voltage is reduced according to the law of maintaining the boundary current of this system.

By reducing the breakdown voltage to a value close to the magnitude of the voltage from a powerful source (breaking voltage), the channel is picked up by the current of this source.

Since both sources (breakdown and destruction) are connected to one piece of ore at the same time, pickup from a powerful source will occur in the shortest possible time, automatically, since the breakdown channel heats up sufficiently fully and the resistance of the channel also decreases so much that the current from a powerful source of destruction at the time of the pickup will not

less current breakdown, then the process of further heating of the channel bzdet flow 3 dole satisfactorily.

Using the proposed method in comparison with the known gives the following

advantages:

the ability to sample ore chunks of large size and nroby ores with high electrical resistance;

high efficiency of the destruction process due to fast pickup of the sample channel.

Claims (2)

1. The method of destruction by electric current, which involves using a high voltage direct current for breakdown, and for destroying the ore, a low voltage, which also differs from the fact that, in order to reduce the energy intensity of the process, the ore is supplied with a current of a half-wave voltage, herewith, as the resistance of the ore decreases, the minimum current strength necessary for its destruction is maintained. 2. The method according to item I, which is connected with the fact that low and high voltage current sources are interconnected and ore with the same polarity. Sources of information taken into account during exerntize: 1. USSR author's certificate number 162796, cl. E 21 C 37 (18, 1958). 2. USSR author's certificate number 514954, cl. E 21 S.37 / 1: 8, 1974.