RU2760950C1 - Method for producing raw materials for production of mica paper from dumps of mica mines - Google Patents

Abstract

FIELD: chemistry.SUBSTANCE: invention relates to a method for enriching mica for production of mica paper used primarily in the electrotechnical industry. The method for producing raw materials for production of mica paper from dumps of mica mines includes the stages of using slot and sieve vibrating screens. At the third stage, the remaining small-sized mica plates with a size of less than 4 cm2and the remaining rock enter an aerodynamic separator, wherein fine-sized mica and fine rock are separated by means of air supply.EFFECT: increase in the productivity due to production of mica with a size of less than 4 cm2from dumps and purification thereof is provided.1 cl, 1 dwg, 1 ex

Description

FIELD OF TECHNOLOGY

The technical solution relates to a method for the enrichment of mica for the production of mica papers used mainly in the electrical industry, in particular for insulating gaskets, insulation of windings of electrical machines, high-voltage cables or between collector lamellas, etc.

LEVEL OF TECHNOLOGY

It is known that dumps are the placement on the surface of empty (overburden) rocks or substandard mineral raw materials, as well as tailings of concentration plants, waste or slags from various industries and the combustion of solid fuel. The dumps contain a fairly large amount of minerals, including mica raw materials. The mica raw material itself in the dumps is represented by small-sized mica crystals, pressed / bonded to the rock.

When enriching mica ores, namely mica of the class - 20 mm (mica less than 4 cm ² ), belonging to the category of small-sized micas, are not extracted and together with the rock mass are sent to the dump, although they make up to 30% of the total amount of mined mica, which is an ineffective process of enrichment and rational use of valuable raw materials. At the same time, small-sized mica, less than 4 cm ² in size, is used only for the production of ground and crushed mica (Volkov KI "Properties, extraction and processing of mica". East Siberian book publishing house, 1977).

Known pneumatic separator (UA84202 from 31.10.2006, class IPC В07В 9/00, В07В 4/02) is used in the mining industry, when enrichment for pneumatic separation of raw materials (a mixture of crystalline rocks and clay), which is characterized by the presence of clay particles, associated with solid mineral particles that have a different particle size distribution. The pneumatic separator contains a housing with an air supply mouth, an outlet and dividing cans connected to the base of the housing. In the upper part of the body, on shock-absorbing supports, a loading device is fixed, connected to a vibration exciter, which is made in the form of a receiving watering can with a roar. The loading device is equipped with cantilevered bumpers-grinders made of elastic-yielding material, which are installed with the possibility of abutting the working surface of the screen, and are also fixed on the inner generatrix of the receiving watering can. The tops of the dividing lines are equipped with hinged slide gates, made with the possibility of fixing the position, above which an aerodynamic grate is installed at the level of the base of the body. The implementation of the invention allows for effective separation of rock mass, which has clay impurities, the volume of which exceeds the volume of mineral particles that contain a useful component.

The disadvantage of the specified pneumatic separator is the use only for a mixture of crystalline rocks and clay. In addition, there is no sorting of rocks by weight.

Also known technology Sobennikov N.V. "Development of technology for the extraction and processing of mica raw materials from the dumps of the Slyudyanoye flogopite deposit" (dissertation abstract for the degree of candidate of technical sciences, Irkutsk, 2006). The aim of the work is to develop a technology for the enrichment and processing of small-sized mica raw materials, subject to the rational use of natural resources, while analyzing the raw material base (dumps of rock mass) of the Mica phlogopite deposit and the feasibility of using small-sized micas of the class - 20 + 1 mm.

The disadvantage is the use of small-sized micas of the class - 20 + 1 mm. In this case, smaller ones less than 10 mm are not considered.

Known technology for the extraction of mica from the waste of mining and processing enterprises (Perfilova Yu.V. Thesis for the degree of candidate of technical sciences, Irkutsk 2008) and technology for the extraction and processing of mica raw materials from dumps of mica deposits of phlogopite (Sobennikov N.V. Thesis and abstract on VAK RF 25.00.13, electronic deposit https://www.dissects.com/content/razrabotka-tekhnologii-izvlecheniya-i-pererabotki-slyudyanogo-syrya-iz-otvalov-slyudyanskogo), where the possibility of enriching mica in form is considered. In the stated technologies, mica is processed using slotted and sieve vibrating screens. Used mica of large and medium size, namely over 4 cm ² , which after processing goes to the manufacture of mica paper, and the rock with fine mica goes to the dump. These technologies are taken as a prototype.

Also known aerodynamic separator - designed for cleaning from any kind of garbage, and sorting by weight of seeds of cereals, legumes, forage, oil and grass crops. Previously, separators of this type were not used for cleaning rocks.

The task of the technical solution is to develop a method for obtaining raw materials for the production of mica paper from dumps of mica mines, which increases productivity by obtaining and purifying mica from dumps of less than 4 cm ² and its further use to obtain mica paper.

DISCLOSURE OF THE ESSENCE OF THE TECHNICAL SOLUTION

The technical result of the above problem is achieved through the development of a method for obtaining raw materials for the production of mica paper from dumps of mica mines, which includes the stages of using slot and sieve vibrating screens, while sorting mica by weight is additionally introduced, due to the use of an aerodynamic separator with a horizontal air flow.

According to the technical solution, the method is achieved due to the fact that the sorting of mica is carried out with a size of less than 4 cm ² .

These technical solutions provide an additional amount of raw materials for the production of mica paper, due to the use of small-sized mica, less than 4 cm ² .

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 schematically shows a block diagram of a method for obtaining raw materials for the production of mica paper from dumps of mica mines, where

pos. 1 - slotted vibrating screen, is a device with metal parallel strips located at a certain distance, for example, but not limited to 3 to 5 mm;

pos. 2 - sieve vibrating screen, is a device with a lattice, where the cells are made in the form of a square, for example, but not limited to, about 20 × 20 mm ^{2 in} size;

pos. 3 - belt conveyor, is a continuous transporting device, the working body of which is a movable endless belt, enveloping two end drums - drive and tension;

pos. 4 - aerodynamic separator, is a device for separating materials into light and heavy fractions.

IMPLEMENTATION OF THE TECHNICAL SOLUTION

In the technical solution, the terms used are understood as the following concepts:

"Raw mica" - mica and breed.

"Mica" and "mica crystals", "mica particles" are one and the same, namely mica in the form of crystals.

At the same time, in addition, the Applicant considers to give the following explanations:

The undersize product of stage I is mica and fine rock.

The undersize product of the II stage is a smaller size of mica, in comparison with the mica of the I stage and a fine rock, due to the use of a fine mesh at the stage II.

The oversize product of the I stage is a large rock sent to the dump.

The oversize product of the II stage - represents the sent mica and medium rock to the conveyor belt, where manual sampling takes place.

For mica / mica crystals, the following divisions are adopted:

- purchased crystals with a size of 100 cm2 or more are used for the production of sheet products, such as viewing windows and television mica, etc .;

- medium crystals, ranging in size from 50 to 100 cm2 - in capacitor and radio-component areas;

- medium-small crystals, ranging in size from 25 to 50 cm2 - in capacitor and radio-component areas;

- small crystals, ranging in size from 4 to 25 cm2 - are used for the production of mica papers (mica plastics and mica);

- less than 4 cm ² - sent to the dump - previously almost never used.

To date, the technology of enrichment of mica raw materials after mining at mica deposits is known, which is a standard separation of mica raw materials - mica from the accompanying rock are used slot (1) and mesh (2) vibrating screens, where after mesh (2) mica enters the belt conveyor ( 3), where manual sampling of mica is made according to the size of their area.

The claimed technical solution provides for the production and purification of mica from dumps less than 4 cm ² and its further use for the production of mica paper.

The claimed method of obtaining raw materials for the production of mica paper from dumps of mica mines is carried out in three stages:

The first stage is the separation of mica and rock in shape. The work takes place with the help of a loading hopper (not shown in Fig. 1) mica raw material enters the slotted vibrating screen (item 1), into the slot. The size of the slot, for example, but not limited to 3 to 5 mm, where, during vibration at a certain inclination, approximately 20 °, mica, which is a plate, falls into stage II (undersize product). And rocks of various shapes (oversize product) go to the dump.

The second stage is the separation of mica and rock by area. The work is carried out using a vibrating sieve screen (pos. 2), where, also with vibration and a certain inclination, approximately 20 °, the rock and mica are sorted. In this case, mica with a rock (oversize product) larger than 4 cm ² falls on the belt conveyor (pos. 3), where the manual sampling of mica takes place. And mica with a size of less than 4 cm ² with small rocks falls on stage III (undersize product).

The third stage, previously not used anywhere, which meets the criterion of "novelty" is the separation of mica and rock by weight. At this stage, the remaining small-sized mica plates, less than 4 cm ² in size, and the remaining rock enter the aerodynamic separator (pos. 4), where, with the help of air supply, the small-sized mica and small rock are separated, since the rock having a greater weight than mica leaves into a dump (waste), and mica rises through the air (finished product) and is subsequently collected for sending it for processing to obtain mica paper. The finished product of stage III is mica with a size of 0.5 cm ² to 4 cm ² with an amount of rock acceptable for the production of mica paper, less than 3%. At the same time, at stage III there is a by-product - dust (dusty mica), also with a permissible rock threshold of less than 3%, which is used for grinding.

Example 1:

An experiment was carried out at one of the enterprises where mica paper is produced.

The essence of the experiment: mica raw materials were used from a dump of a mica deposit, in the amount of 30 tons. The raw material was passed through three stages. About 16 tons of mica paper was received, corresponding to TU No. 3491-088-00281915-2007.

The claimed technical solution, namely a method of obtaining raw materials for the production of mica paper from dumps of mica mines, through the use of an aerodynamic separator, provides an increase in productivity, due to the processing of raw materials from dumps of mica deposits.

Claims (1)

A method of obtaining raw materials for the production of mica paper from dumps of mica mines, including the stages of using slot and sieve vibrating screens and characterized in that at the third stage, the remaining small-sized mica plates with a size of less than 4 cm ² and the remaining rock fall into an aerodynamic separator, where, by means of feeding air separation of fine mica and fine rock.

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