The article provides an overview of methods for concentrating juices and juice-containing liquids and proposes a vacuum method for concentrating juices, based on previous experiments on vacuum cooling of water. Vacuum-evaporative concentration of juices has a number of advantages that can be successfully implemented in production. The developments of water use as a refrigerant, as well as experiments on machines with an open cycle, provide the necessary and sufficient material for development in the field of concentrating juices. The use of low temperatures creates the evacuation effect.

The article describes the analysis of the operation of existing production facilities for the extraction and processing of deposits. The study of the effective functioning of the natural-technical system in the extraction of a useful component of deposits is an extremely urgent and promising task. The purpose of the research is to study the object of the natural-technical system and determine the type of static ventilation characteristics. The tasks will be solved on the basis of a comprehensive study of the object of the natural-technical system. Experimental data necessary for constructing static characteristics associated with conducting a special experiment on the production site that violates the normal mode of ventilation is obtained. The research and development of a method for determining the static characteristics of ventilation objects, according to normal operation, which are obtained without interrupting the technological process of extracting the useful component.

The paper presents an analysis of operating currents and torques during self-starting of motors with a voltage of 6 kV for cases of short circuit in the head feeders from the main step-down substation and in the feeders to the most distant substations of mining enterprises. For the network under consideration, the characteristic modes are: short circuit on the buses of shop substations. For the mining industry when selfstarting asynchronous motors with a squirrel-cage rotor and synchronous motors with asynchronous startup, the current multiplicity will be determined by the duration of the power failure (run-down duration). It has been established that the acceleration of motors during self-start will be somewhat slower than the usual start, since self-start begins at a speed of 0.89–0.94 of the synchronous speed and a resistance torque is equal to 0.65–0.75 of the maximum motor torque. The self-starting time of the motors is from 9 s to 42 s. To ensure self-starting conditions in the most severe modes in mountain conditions, it is necessary to make changes to the protection settings presented in the work.