SU1421162A1 - Method of obtaining electric insulating material - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to the production of refractory insulation materials used in various electrical heating devices operating at temperatures up to 1000 C. The purpose of scrapping electrical heating units is based on the resulting material by reducing the magnet content. The inclusions in the powder. The magneto-containing raw material is melted, the periclase is cooled, ground to an euren size less than 0.5 mm, subjected to magnetic separation, heat treated, cooled, scattered into fractions G, –0.16 mm and less than 0.16 mm, the magnetic separation of the fraction less than 0.16 mm is carried out, mixed with the remaining part, and the strength of 1 psat of the layered structure is introduced, table 2. and

Description

11A2II62

The invention relates to the field of electrical engineering, in particular, to the production of refractory insulation materials used in various electric heating devices operating at temperatures preferably up to 1000 ° C.

The purpose of the invention is to increase the service life of the heaters, fQ based on the material obtained by reducing the content of magnetic inclusions in the powder.

Below is an example of the implementation of the method in accordance with the invention.

The magnesium-containing raw material melts, cooling the periclase, crushing it. to a grain size less than 0.5 mm, subjected to magnetic separation, heat treated JQ, cooled, scattered into fractions of 0.4-0.16 mm and less than 0.16 mm, magnetic separation of the fraction less than 0.16 mm is carried out, mixed silicate of a layered structure in an amount of 1.% is introduced with the remaining part.

As a silicate of a layered structure, for example, it is naturally referred to the second class according to GOST 13236-83, and obtained by the author. No. 931836 - to the third class (0.30%). The electrophysical properties of both materials are in the same class and in accordance with the requirements of the highest class according to GOST 13236-83 (Table 1).

In the smelting of periclase from chemically pure raw materials, the periclase faults obtained according to the invention on the content of iron oxides belong to the first class (. 0, according to the author. No. 931836 - to the second grade (0.20%). Electrophysical properties of these materials also correspond to the highest class according to GOST 13236-83 (Table 2).

Magnetic inclusions of periclase powder, smelted both from primed brucite and chemically pure raw material according to the invention, decrease by a factor of 2 compared with the conventional method.

The service life of thermoelectric heating pipes made using periclase, obtained in accordance with the invention, increases

talc, rhirophyllite, muscovite, flo-ZO Up to 900 h (compared to 800 h for

gopit, kaolinite, serpentine, asbestos or their synthetic analogues,

Magnetic inclusions are determined according to GOST-13236-83 for the obtained electrical insulating material on the Magnit-704 device. Measurements were made on the material produced from various types of raw material: natural raw material - cultivar brucite, chemically pure raw material - burned magnesia.

The measurement results are shown in Table 1 and 2.

As follows from the obtained data, electrical periclase according to the invention has a higher quality compared with that obtained in a known manner.

So, periclase powder obtained in accordance with the invention from Kuldur brucite, according to the content of iron oxides (Fe, iOj 0.20%)

35

known method).

Claims (1)

Invention Formula The method of producing an electrically insulating material, in which magnesium containing raw materials is melted, is ground to a grain size less than 0.5 mm, is subjected to magnetic separation, thermo. process, fractionated by fractionation, separation is carried out, the addition of a silicate of a layered structure is introduced, characterized in that, c. the purpose of extending the service life of electric heaters on the basis of the material obtained is by reducing the content of magnetic inclusions in the powder; when scattering, fractions of 0.4-0.16 mm and less than 0.16 are separated and subsequent separation causes fractions of less than 0.16 mm. 45 50 refers to the second class according to GOST 13236-83, and received by the author. No. 931836 - to the third class (0.30%). The electrophysical properties of both materials are within the same class and meet the requirements of the highest class according to GOST 13236-83 (Table 1). In the smelting of periclase from chemically pure raw materials, the periclase powders obtained according to the invention, according to the content of iron oxides, belong to the first class (0.12% according to the author. No. 931836 - to the second class (0.20%). Electrophysical properties of the specified materials also correspond to the highest class according to GOST 13236-83 (table 2). The magnetic inclusions of periclase powder, smelted from both natural brucite and chemically pure raw materials according to the invention, are reduced by a factor of 2 compared with the known method., The service life of heaters made using the periclase obtained in accordance with the invention increases Up to 900 h (compared to 800 h for known method). Invention Formula The method of obtaining electrically insulating material, in which the magnesium-containing raw material is melted, crushed to a grain size less than 0.5 mm, is subjected to magnetic separation, heat treated, dispersed in fractions, separation is carried out, the addition of a silicate of a layered structure is introduced, / characterized in that, p. the purpose of extending the service life of heaters based on the material obtained by reducing the content of magnetic inclusions in the powder, with dispersion, fractions of 0.4–0.16 mm and less than 0.16 mm are separated and fractions less than 0.16 mm are subjected to subsequent separation. 3 421162 Table I Electrotechnical properties of peri-slurry smelted from Kuldur brucite Massova dale Fe, 0j, % b 0,300,020 0,300,020 0,350,025 0,250,010 0,280,016 ,five- e 0,300,020 0,300,020 0,350,025 0,250,010 0,280,016 granularity made up 0.25 The specific electrical resistance of the final product, Ohm-cm P2 and temperature e C 1000 800 3, 4-10 0,018 dispersed component g Separation granular component The introduction of the additive in the dispersed component Mixing Final product . Table 2 The properties of electrical periclaev, of the chemically pure type The proposed method Melting Cooling Shredding one Separation Heat treatment Sieving: Fractions less than 0.5- 0.16 mm Fraction less 0.16 mm Separation fractions less than about 16 mm Continuation of table 1 4.5 / 10 1,1-Ш 0.006 0.014 0.008 0,200,016. 0,200,016 0,240,020 0,160,018 0,180,020 0, 160.016. 0, 260.020 0,120,008 0, 28 0.021 0.20 0.015 0.20 0.015 5.510 1.2-1