SU973505A1 - Raw mix for making heat insulating products - Google Patents

Description

(54) RAW MATERIALS FOR THE MANUFACTURE OF HEAT-INSULATING PRODUCTS The invention relates to construction materials and is intended for the manufacture of heat-insulating products. The known raw material mixture for the production of heat insulating products, including phosphate binder and filler, is a mixture of fireclay, refractory clay raw material and claydite C13 gravel. The disadvantage of this composition is low mechanical flexural strength, since the main components in the known composition are chamotte and expanded clay gravel, the latter is not an active additive and does not form chemical bonds with the phosphate binder, and the chamotte does not interact with phosphoric acid and do not provide high mechanical strength of products. The closest technical solution to the invention is a raw material mixture 2 for the manufacture of thermal insulation products, including refractory naphtha lnitel, orthophosphoric acid, zfir and blowing agent with the following ratio of components, weight,% Refractory filler 53-60 Orthophosphoric acid17-21 Ether .14,1-15,1 Foaming agent 8.9-10.9 The disadvantage of the known composition is low mechanical resistance to bending and compression. The purpose of the invention is to increase the mechanical strength during bending and compression, as well as the disposal of industrial waste. The goal is achieved by the fact that the raw material mixture for the manufacture of thermal insulation products, including phosphate binder and refractory filler, contains refractory clay as a refractory filler, alumina with a specific surface area of 8500 cMVr, and alumina production and an additional sintered high alumina mass: wt.%: Phosphate binder 35-45 Clay refractory 6-8 Alumina with

specific surface

7, 8500 cm2 / g 40-46 Sludge electrocorundum

production 8.5-10

A spexa with a high alumina mass of 0.5-1.0 The introduction into the raw material mixture of dense high alumina mass in the form of molded granules with a ratio of diameter to length from 1: 3 to 1:30 stacked in a plane perpendicular to the applied load allows It significantly increases the mechanical strength during bending and compression. The combination of the mixture of the active form of finely ground alumina with unfired clay and phosphate binder leads to the chemical formation of strong phosphate bonds, promotes high reactivity in the binding agent and its high adhesion to the filler-sludge of alumina production and reinforcing high-alumina speciated mass. This leads to the appearance of crystalline neoplasms with high mechanical properties, and has a favorable effect on the splicing of the main binding component with the bearing force skeleton of the filler. The combination of the bulk structure and its reinforcing structural mesh of ceramic elements allows a significant increase in the mechanical strength of the thermal insulation products. The composition uses waste products of the abrasive and ceramic industries: electrocorundum sludge in the form of detrital crystals with a diameter of 0.5 to 20 µm, and sintering with a high-aluminaist mass in the form of hollow tubes or solid rods manufactured by drawing ceramic material especially as filler or glass Ceramic production waste (cuttings of thermocouple straws, substandard granulated speckled noodles).

With an increase in the initial mass of electrocorundum sludge and high-alumina sintering mass to the maximum indicated percentage, the compressive and flexural strength of products increases significantly, but the heat resistance index somewhat decreases. With a decrease in the initial mass of the sludge and the sintering of the high-alumina mass to the minimum indicated percentage, the compressive and bending strength of the products somewhat decreases, but the thermal resistance increases.

Example 1. 35% of an alumina-chromophosphate binder is thoroughly mixed with a previously prepared mixture consisting of 46% by weight of alumina with a specific surface, 8500 cMVr, 8% by weight of refractory clay and 10% by weight of electrocorundum sludge. 1/3 of the mixed mass is placed in a mold, then 1.0 wt.% Of the sintered high-alumina mass is laid, and then the remaining part, the shape with the mixture, is subjected to a thermal sample, bot, e at t / 300-350 ° C. Example 2. 41 wt.% Orthophosphoric acid is thoroughly mixed with a pre-prepared mixture consisting of 43.32 wt.% Alumina with a specific surface area of 7/8500, b wt.% Of refractory clay and 9 wt.% Of electrocorundum sludge 1/3 part the mixed mass is placed in the mold, then 0.68% by weight of the dense sintered high-alumina mass is laid and the remaining mixture, the form with the mixture is subjected to heat treatment at t 300-350 ° C.

Example 3. 45% by weight of orthophosphoric acid is thoroughly mixed with a premixed mixture consisting of 40% by weight of alumina with a specific surface of .8500 6% by weight of refractory clay and 8.5% by weight of electro-corvadagous sludge. 1/3 of the mixed mass is placed in the mold, then 0.5 wt.% Of the dense sintered high-alumina mass is laid and the remaining mixture, the mold with the mixture is heat treated at t 300350 ° C.

The table shows the characteristics of thermal insulation material of the proposed composition and prototype, confirmed by the test report.

All thermal insulation products made from the raw material mixture of the specified composition have high mechanical strength in compression and bending in comparison with the known ones, which makes it possible to expand the application areas of the products, improve the efficiency and quality of operation of thermal units and reduce labor costs by 30%.

The economic effect of using the invention is 30 thousand rubles. from one furnace. .

Composition, wt.%

Strength, kgf / cm, with

bend

; compression

Alumochromophosphate binder 35

Alumina with a specific surface area / 8500 cMVr 46

Clay refractory

Electrocorundum sludge

Sintering with a high alumina mass1.0

Orthophosphoric acid

Alumina with a specific surface area of 7 / 8.500 cm V g 43.32

Clay refractory 6 88.3

Electrocorundum sludge 9

Speksha with high-alumina mass0,68

Phosphoric acid

Alumina with a specific surface of 7.8500

Clay refractory

Vortex Sludge

Speksha with high alumina mass

Prototype

Burnt Alumina

23.4

8 85.2

ten

41

26.0

45

24.1

6 87.4 8.5

0.5

51.2

Composition, weight,%

Aluminum hydroxide

Phosphoric acid

Ether

Claims (2)

Frother Formula of the invention Raw material mixture for the manufacture of thermal insulation products, including phosphate binder and refractory to filler, characterized in that, in order to improve the mechanical strength in bending and compression and recycling of production waste, it contains refractory clay as a refractory filler, alumina with a specific surface area of 7/8500 cm / g, sludge from electrocorundum production, and additionally sinter high-alumina mass in the following ratio of components j wt.%: Table continuation Strength limit, kgf / sy, at bend compression1 1.0 Phosphate Bond 35-45 Clay refractory 6-8 Alumina with a specific surface of 8500 cm2 / g40-46 Electro-alumina production sludge 8.5-10 Spokesh from a high-earthman mass 0.5-1.0 Information sources, ny into account in examination 1, USSR Copyright Certificate 08930, cl. From 04 To 29/02, 1973. 2. USSR author's certificate 08989, cl. From 04 To 35/10, 1971.