SU1096249A1 - Refractory protective daubing composition - Google Patents

Abstract

REFRACTORY PROTECTIVE COATING, including fireclay or corundum, or kyanite-sillimanite concentrate, refractory clay or ground asbestos, aluminum hydroxide, phosphate bond, which is designed to increase the metal resistance and accelerate the coating, to apply a paste, apply, apply, apply, apply, apply, apply, and apply, to put a paste on the surface of the coating, to apply a metal-resistant coating and to accelerate the coating, to apply a paste, to apply the coating, to apply a paste, to apply the coating, and to apply a paste to put on the surface. cement or ground chalk, or slag of aluminothermic production of metallic chromium and barium sulphate in the following ratio of components, wt.%: Refractory clay 4-12 I.PI threshing asbestos 4-8 Aluminum hydroxide 25-35 Phosphate Binder Alumina cement or ground chalk, or i slag of alumino-thermal production of metalna 2-7 c chrome 10-25 Barium sulphate Chamotte or corundum, or kylen-schshmanitovy Else, concentrate

Description

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4 CO. The invention relates to the composition of refractory masses used to protect the linings of induction furnaces and other thermal units for melting, holding and transporting aluminum alloys. Known refractory mass used for the repair of fireclay or dinas masonry lj, including aluminosilicate fireclay (83-97 wt.%. Refractory clay (0-10 wt.%) As a plastic additive, phosphoric acid (12-18 wt.%) as phosphate binder and aluminum hydroxide (3-7 wt.%). The disadvantages of the coating are the absence of solidity at normal temperature, low metal resistance due to wettability and impregnation with the melt. The most similar in technical terms; the effect to the proposed is refractory ma cca 2j 5 inclusive,%: schamot 49 49; refractory clay 18-29; hydroxide aluminum 4-8; phosphate bond 8-18. Its disadvantages are low metal resistance and slow twing. The purpose of the invention is to increase metal resistance and accelerating hard coating. The goal is to achieve a fireproof protective coating that includes fireclay or corundum, or d-tensillimanite concentrate, refractory clay or ground asbestos, aluminum hydroxide, phosphate bond, additionally contained alumina cement W: grind and ground, shak slag aluminot Thermal production of metallic chromium and barium sulphate at the following ratio-i components, wt.%: Refractory clay or ground asbestos 4--12 Aluminum hydroxide 4-8 Phosphorous binder 25-35 Alumina cement or ground chalk, or aluminothermic slag metal production chromium /.-/ Barium sulfuric acid 10-25 Chamotte or corundum, or kyanite-silymanite concentrate The remaining Mass for coating is prepared as follows. The dry powders are thoroughly mixed, then the required amount of phosphate binder is added and the mixture is mixed until a homogeneous mass is obtained. The coating is applied to the lining in any suitable way. The coatings made from the masses of the proposed composition are characterized by the following properties: Compressive strength, kg C / cm after 2 hours of drying at 170-220 after 360-405 blistering 1. Gluoika impregnation metmet (ohm), mm No impregnation Comp. mixtures of coating and properties are given in table. 1 and 2, the hardening of the coating, depending on the content of calcium oxide and phosphate SBZUyush; it occurs in: ultats; their chemical interactions;: g; -51: formation of calcium phosphates B 1-1.5 hours. In addition, the formation of calcium phosphates significantly (C) increases chemical resistance to aluminum alloys and mechanical .ecv-: its strength of the coating. An increase in the content of the calcium-containing component of more than 7% by weight means that it increases the rate of hardening, resulting in a sharp decrease: h); the time of mass suitability for bseiieiirra, - C1 Il; its content is less than 2%; Pekhapichnaya durability of the coating and its chemical resistance to aluminum alloys .: Adoption of sulfuric barium in the composition of the plaster helps to increase the durability of the binder and the strength of the joint. LPS-lecKH preventing its melt impregnation, increasing the metalloustoychi-: awn With increasing sulphate content (dawn than 25 wt% prochnostt wash properties of practically do not change..

310962Л94

Reducing its content to less than other thermal units for melt 10 wt.% Reduces mechanical strength, aging and transportation of aluminum and its metal-resistant mini alloys by 1.5-1.8 times, high efficiency. High performance indicators Using a refractory protective material to reduce labor costs

coating allows for an increase in cleaning and maintenance, specific

metal resistance of the coating, its consumption of refractories and circles of auxiliary erosion resistance, reduction of adhesive materials, increase

overgrowing of the lining to increase the capacity of the melting aggregate of induction crucible furnaces. „

5li protective coating contribute

Table 1

Zapolnitelshamot alumina-mullite fireclay 453423- mullitokorundovyy- - - 45 35 korund- - --disten-sillimanite concentrates - - - I Plastic Additives refractory clay asbestos 124moloty April 8 - - -. 9 calcium- aluminate component tsement25 7 - ground chalk - - - 25 slag of aluminothermic production of metallic chromium - .- Phosphate linkage orthophosphoric acid35 32 25 35 -. alumochromophosphate binding - - - - - 30 Aluminum hydroxide 4 6 846 Barium sulphate 10 15 25 10 15 - - - - - 23 - - 45 35 23 - - - 45 36 23 12-9 - 4 - 12 - 4- 12- 8 7 - - - 5 - - 7 2 - - 25 - - - 7 25 - - - - 30 - 35 30 25 35 - 25 8 46 8. 4 6 8 25 10 15 25 10 15 25

Compressive strength, kg / cm

after 2 hours of drying at

175 205 220 178 200 220 170 208 220 173 193 220

after roasting at 750 ° С 360 385 403 365 380 405 360 398 400 366 380 400 Metal resistance (depth of metal impregnation), mm Metal not

Table 2 penetrates the depth, the melt coating is not wetted

Claims (1)

FIRE-RESISTANT PROTECTIVE COATING, including fireclay or corundum, or distene-sillimanite concentrate, refractory clay or ground asbestos, aluminum hydroxide, phosphate binder, characterized in that, in order to increase the metal resistance and accelerate hardening of the coating, it additionally contains alumina cement or ground chalk, or slag aluminothermic production of metallic chromium and barium sulfate in the following ratio of components, wt.%: Fire-clay or ground asbestos 4-12 Aluminum hydroxide 4-8 Phosphate bond 25-35 Alumina cement or ground chalk, or aluminothermic slag metal production (L chrome chromium 2-7 Barium Sulfate 10-25 Fireclay or corundum, or U. distene sillimanite ON THE concentrate Rest. ON THE W ς © 6249