RU1640944C - Charge for manufacturing electric-insulating materials - Google Patents

Abstract

The invention relates to a mixture for the production of electrical insulation materials used in the electrical industry. The purpose of the invention is to reduce losses of the finished product and the expansion of the mineral resource base while maintaining the high physical and ceramic properties of the electrical insulating material. The mixture for producing an electrically insulating material contains, wt.%: Electrofused perknlaeovy powder 92.5 - 97.0; dust gas treatment electrofusion production of magnesium oxide 3.0-7.5. The apparent density of the samples is 2.34-2.40 g / cm3, fluidity 0.4.4 - 0.53 g / s, specific resistance at 800 ° C (6, -2-7.4) - K) 7 ohm cm Loss of finely divided fractions are absent, 1 tab. S /)

Description

The invention relates to firs for producing ceramic electrical insulating materials and can be used in the electrical industry in small diameter tubular electric heaters (TENs) (diameter less than 10 mm).

The chain of the invention is the reduction of losses of the finished product and the expansion of the mineral resource base while maintaining the high physical and ceramic properties of the electrical insulating material.

As a finely dispersed additive, gas treatment dust from electric smelting production of magnesium oxide is used, including May.%: Mr, 0 85.0-91.8;

CaO 0.91-1.34; SiOz 0.42-1.84; A1e03 0.32-2.44, Ke20e 0.04-0.14; p.p.p. 6.51-9.24.

Magnesium-containing raw materials (natural brucite or magnesite) are melted in an electric arc furnace. The resulting fused magnesium oxide block is cooled, then ground. The obtained powder in an amount of 97 wt.% Is mixed with melting dust in an amount of 3.0 wt.%, Captured by the cyclone during melting. Stirring is carried out in a ball mill, heat treatment is carried out in a rotary kiln in atmospheric air at a temperature of 800-1200 ° C for 2 hours. Then from gooe

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samples are taken to determine the properties of the powders.

The properties of the powder of electrical insulation material obtained from the claimed charge and according to the prototype are shown in the table.

The proposed mixture has physicochemical characteristics at the level of the known, but upon receipt of it there is no loss of the finished product, while in the prototype the screening of the finely dispersed fraction is 10-15 ms.%. I

The proposed mixture allows the use of production waste, improve the environmental situation and increase the output of high-quality electrical insulating material.

Claims (1)

The claims  to obtain an electrically insulating material, including electrically melted periclase powder and a finely dispersed additive, it is desirable that, in order to reduce the loss of the finished product and expand the mineral resource base while maintaining high physico-ceramic properties of the electrically insulating material, it contains, as a tocodispersed additive, gas cleaning dust from the electric smelting production of magnesium oxide in the following, ratio of components, wt.%: Electroplaned periclase ear 92.5-97.0 Gas cleaning dust electric smelter oxide production magnesium 3.0-7.5 Material Composition, Casual - Teku-Specific mag.% with density, electrical capacity g / resistance after ut at 800 ° C, DYASKI, OM SM g / cm1 Periclase Powder92, 52.40 0.44 7.4.107 Dust smelter 7, 5 --..-.-,., ------....-. 1в.в, в -.-.- ,. Periclase powder 97.0 2.34 0.53 6.2-10G Melting dust 3, 0 Periclase powder Fresh 95, 02.350.50 7.3 tO Smelting dust 5, 0 According to the prototype, 2.36-2.38 0.52-6.3-10G 0.62 Compiled by L. Bulgakova Editor E. Savina Tehrrd A. ровrovchuk Corrector S. Shekmar Order 1084 Circulation VNIIIPI of the State KOMNTRCH for inventions and discoveries under the USSR State Committee for Science and Technology N3035, MOGKRCH, Zh-15, Rauska nab., 4/5 Ochch odnly-ed tELEKNG mLrch t Patent, Uzhhorod, st. Gashrin, 101