SU903350A1 - Refractory coating - Google Patents

Description

C54) REFRACTORY LINING

I

The invention relates to the technology of refractories, in particular, refractory coatings hardening at ordinary temperatures and including aluminosilicate filler, magnesite powder, phosphate binder and additives, increasing adhesion and strength, and can be used as coatings for chamotte refractory materials and in the form of heat-imperfections, strength, aluminates, strength, and can be used as coatings for chamotte refractory materials and in the case of heat-resistant, durability, and can be used as coatings for chamotte-type refractory materials and in the case of heat-resistant, durability, and can be used as coatings for chamotte refractory materials and in the case of heat-resistant, durability, and can be used as coatings for chamotte refractory materials and in the case of heat-resistant, durability, and can be used as coatings for chamotte refractory materials and in the case of heat-resistant, durability and durability; units in the metallurgical, chemical and building materials industry.

A refractory coating is known, which includes chamotte powder, phosphoric acid, and electrocorundum sludge waste.

However, this coating is characterized by insufficient strength and adhesion to concrete.

The purpose of the invention is higher strength and adhesion to refractories.

This is achieved by the fact that the refractory coating, including chamotte powder, orthophosphoric acid, electrocorun waste slurry, additionally contains magnesite powder and zircon concentrate

with the following ratio of components

weight.%;

Chamotte powder35-38

Orthophosphoric Acid37-39 Slime Otshchish 1

electrocorundum 13-18

Magnesite Powder4-8

Zircon concentrate3-5

When sharing in composition

10 refractory coating of electrocorundum sludge waste and magnesite powder, the heat treatment temperature is reduced to 150-200 ° C. After heating to 200 ° C, the prochuty reaches 230-290 kgf / cm. Also fire

15 resistant coating hardens and without heating after soaking for 5-7 days at normal temperatures. The thermal resistance and wear resistance of the coating are also increased due to the incorporation of two dissimilar crystalline phases, such as corundum in sludge waste and zircon in zircon concentrate.

Characteristics of raw materials.

3903350

The sludge waste from the production of electrocorundum must contain at least 70% AljOj, the content of particles less than 63 µm should be 60-75%. For use as a coating component, the sludge waste is dried and sieved through a No. 1 sieve to remove lumps.

Chamotte powder of class B should not contain grains more than 1 mm more than 5%, the content of particles less than 63 µm should be 50-70%.

; The magnesite powder (metallurgical magnesite) is applied with the following particle size distribution:

Hole sizePrivate leftovers,%

in light, mm

0.8

1.5

5.1

11.3

38.5

27.1

15.7 Zircon concentrate KPTs-1 should comply with CMTU 05-29-67. Orthophosphoric acid, corresponding to GOST 6552-58, must be diluted with water to a density of 1.48 g / cm before preparing the plaster. I get fireproof plaster as follows. All the dry ingredients: chamotte powder, electrocorundum sludge waste, magnesite powder and zircon concentrate, dosed by weight, are mixed until a homogeneous mixture is obtained, but not less than 5 minutes, then the necessary amount of phosphoric acid is added and thoroughly mixed again. Then the coating is applied in the usual way - by spraying or drying - on the surface of the protected refractory with a thickness of 2-5 mm. Three mixtures of the ingredients listed in Table 2 are prepared to obtain a refractory coating. one.

From the above compositions of refractory masses, cubic specimens with a face size of 7.07x7.07x7.07 cm are made by vibrating. They are subjected to tests for ultimate compressive strength, fire resistance, and thermal durability. In addition, refractory coating is applied to the built-up cubic samples, made of chamotte refractories, to determine the shear strength and determine the timing of hardening during normal

temperatures.

Physics and mechanical characteristics of the compositions of refractory coating studied are given in table. 2

After 5 days, she hardened in air 3 composition, after 7 days - compounds 1 and 2.

The adhesion of the studied plasterings is high: When determining the shear strength on the boundary-chambered refractory - plaster after heating 1200 ° C, the destruction of the specimen occurs on the refractory, and not on the plaster or boundary of the refractory - plaster. This indicates a high adhesion of the coatings with refractories. Due to its high strength and adhesive bonding, the coating has wear resistance. As can be seen from the table, the coatings have high strength already after heating to 200 ° C, which indicates a decrease in the temperature of their hardening, due to the joint introduction of light powder, zircon concentrate and electrofluoric acid slime. High values of compressive strength after heating to 1200 ° C and adhesion to heat resistance exceed the same characteristics for known compositions. Table 1

Strength at szhapsh, kgf / cm, after heating to, ° С

200,100

Density, g / cm, after heating to 1200 ° C

Refractoriness, C

Thermal stability,

during cycles 800 - water, pcs

Adhesion on shear strength, MPa

Claims (1)

Invention Formula Refractory coating, including chamotte powder, orthophosphoric acid, electrocorundum sludge wastes, about 1 ml and tea, so that, in order to increase strength and adhesion to the refractory material, it contains a magnetite pore (syrup) and zirconium concentrate is attached to a paste. .%: table 2 237 231,282,298 1.76 1.73 1520 1480 EO 32 Fireclay powder35-38 Orthophosphorus i1 acid 37-39 Slurry waste of electrocorundum13-18 Magnehovy powder4-8 Circus concentrate 3-5 The sources of information taken into account in the examination I. USSR Avkfskoe certificate № 628121, l. From 04 To 19/00, 1977.