SU1609776A1 - Charge for making refractories - Google Patents

Abstract

This invention relates to masses for making carbonaceous refractories. The purpose of the invention is to increase the resistance to oxidation, high temperature strength and increased slime resistance. Mass contains, by weight. %: crystalline graphite 5-15

phenolic powder binder 2.5-3.5

liquid phenolic binder 3.2-4.2

fused chrome – alumina – spinellide fraction ≤ 0.06 mm and the rest is periclase filler. The limit products of the compressive strength at 1500 ° C was 13,8-15 MPa emost oxidized at 1300 ° C after 3 hours of exposure in an electric 67-83% shlakoustoychivost 0.3-0.4 mg / cm ² s. 2 tab.

Description

The invention relates to refractory industrial sawing, in particular to the production of basic carbon-containing refractories for lining the most wear-out stag areas; advanced thermal units, such as converters, preferably with a combined or gas-oxygen purge.

The purpose of the invention is to increase oxidation resistance, high temperature strength and increase slag resistance.

The following materials are used to obtain refractory products: fused periclase powders with a 96% MgO mass fraction, calcined periclase powders with a 85% MgO mass fraction, crystalline graphite with mass

carbon content 80%, fused chrome alumina spinelide powders with a SiO mass fraction of 1.2%, a phenolic powder binder of the SPP-010A grade, a liquid phenol binder (bakelite varnish) and ethylene glycol. Using the above materials - molded products from the masses, the compositions of which are given in table. D. Preparation of mixes carried out in laboratory mixing runners. The kneading weight is 3 kg. Preparation of the dough of the mass of 1.

In mixing runners in quantities corresponding to a given composition, serves the components of the mass in the following mode: fused powder of periclase fr. 3-1 mm and 2/3 total

about

O5

. the amount of liquid phenol binder followed by the complete coating of the grains with a binder, fused powder of periclase fr. mm, graphite and after mixing - within 2-3. min the remaining amount of liquid phenolic binder, followed by stirring. for -v 3 min; thin-

, m lotuyu component of the charge fr. , 0.06 mm / fused powder per KJtasa and after stirring for 3 mmn phenolic powder

n

the subsequent binder is final

n "stirring all the components. at

for min to obtain a homogeneous mass. Total duration

P11) igotovlen mass amounted to 18

26) 1F1H.

The procedure for preparing mass mixes of compositions 2 ,, 3 ,. 4, 6 is similar to the preparation of composition 1 ". Instead of finely ground melted pore, periclase fr, 0.06 mm, melt powder of chrome glino-spinelide is introduced into the mass. tayuke fr. 0.06 mm, the preparation of the kneading of the mass of composition 3 in addition to the above, instead of the liquid phenolic binder, is used ethylene gl-jol

Preparation of the kneading of the mass of 7–9, i binder coatings; annealed powder of periclase FR, 1-0 mm, graphite and after stirring for 2-3 minutes the remaining amount of liquid phenolic binder, followed by stirring for minutes powdered phenolic binder, followed by final mixing of all components for -rv 5 minutes to obtain a homogeneous mass. The total cooking time is 18-20 minutes. From 1 x mass prepared with a specific pressing pressure of 100 MPa. Samples of 36 mm and h 40 mm are molded on a hydraulic press. Samples after molding are subjected to heat treatment at 200 C.

0

0

five

..

five

0 5

5 0 5

0

On the heat-treated samples, the apparent density was determined according to GOST 2409 and the open porosity was determined by

GOST 2409-80.

The compressive strength of the samples was determined according to GOST 4071-80. .

Slag tolerance of the samples was determined by the method of a cylinder rotating in the slag on a plant designed at the Institute of Refractories. The wear of the refractory was evaluated according to the chemical and analytical determinations of the components of the sample dissolved in the slag.

Resistance to oxidation of the samples was evaluated based on the degree of their decarburization after 3 hours of exposure in an electric furnace preheated to 1,300 s,

The calculation of oxidation was carried out according to the formula:

.OO „-

OBS,

where is the sample area, oxidized, sawn in diameter; about & total sample area,

sawn in diameter. Physical and technical properties of products are given in table. 2

As follows from Table 2, samples made from the mass of the prototype, composition 1, have a high density but low slag resistance, high temperature strength, and are not resistant to oxidation.

Samples of the masses of the proposed composition have higher high-temperature strength characteristics, are more resistant to oxidation, have a higher slag resistance than products from the mass of the prototype, with almost equivalent apparent density. The apparent density of the samples from the masses of the proposed composition is made of 1- & 1x based on sintered periclase powders (composition 8-10), although lower than the density of products from the mass of the paste, however, the former are also characterized by resistance, oxidation resistance and high temperature resistance.

Claims (1)

Formula The mixture for the manufacture of refractory products, containing rod,, wt.%: Crystalline graphite 5-15, in conjunction. phenolic powder 2.5-3.5, liquid phenolic binder 3.2-4.2, fine-ground component 20-25, granular periclase, the rest, in order to increase oxidation resistance, high temperature strength and increase slag resistance, it contains as a ground component a square chrome alumina spine-1t. Table 6lit2