SU1430382A1 - Refractory composition - Google Patents

Abstract

The invention relates to refractory masses that can be used in the manufacture of refractory. blocks bearing significant mechanical stress when exposed to high temperatures. The purpose of the invention is to improve formability and increase the strength at temperatures from 600-1300 C. The mass contains, by weight,%: kaolin 9-12; sodium trimetaphosphate, 3-10; water 2-6; periclase else. At the firing temperature of 600, tOOO, compressive strength, respectively, amounted to 1185- 2415, 2432- 2880 and 2430-4180 kgf / m, and the bending strength is 500-801,. - and 907-1418 kgf / m. There was no shrinkage at 1300 ° C / 7, 2 wasts.

Description

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The invention relates to construction materials, in particular to compositions based on {magnesite or periclase, purpose of the invention. improvement of shape and povnepenie durability. at temperatures from 600 to IBOO C,

Sodium trimetaphosphate is a crystalline product, readily soluble injected, has the formula

(KARO) e.

Periclase used fine grind

in accordance with GOST 13236-83.

The chemical composition of periclase,%; MgO 97.0; CaO 1.5; Re, 0: 0.3; AljOs 0.75; SiO-2 0.8; RFP 0.02,

Specific surface 4574.

Kaolin used the Glukhovitsky deposit (GOST 6138-52), jero composition,%: SiOj 46.09-49.26; AljO, 34.99-39.26; 0.05-4.27; traces - 4.72; CaO 0.03-0.65; MgO traces - 0.32; traces - 0.32; 0.4; 80s traces - 0.32; ШШ l3,2-t3,78.

Specific compositions of the mass are given in table. one.

Table 1

In order to obtain refractory masses Dried at BOC, for 1 h, a solution of tri- and then heat-treated at 600 sodium metaphosphate in water was previously prepared. The obtained -j- 1000, TZOO C for 1 hour, the nasal solution was introduced into a mixture of periclase and kaolin. The resulting mass is pres. In tab. 2 presents the properties popped at a pressure of 1000 IOOO kgf / m, mass.

Table 2

12415 2653

22350 2432

31185 2880

Prototype

504-570 294-472 155-184

Refractoriness up to 1850 C.

to

, Poor formability, smallpox capacity of edges.

Kaolin plasticizes the mass, modifies the sintering of magnesite, Trimetaphosphate sodium is a sintering agent, creating frame phosphate systems, which determines the high strength of the compositions obtained. In addition, Trimetaphosphate enters into chemical interaction with both kaolin and periclase while increasing the density and heat resistance of the compositions. The cyclic trimetaphosphate is broken and the resulting radicals interact with metal oxides and silica,

Improving the strength, improving the sintering of periclase refractory compositions due to the formation at high temperatures of compounds 2MgO 2 A1dO2 2MgO SiO; MgO and other compounds having a complex chemical composition due to phosphate moieties and, for example, MgNaPO,

In addition, the thermal conductivity of periclase refractory mass of 1.28 KCAP / m; bulk weight 3.2 g / cm; abrasion 0.27 g / cm.

The resulting mass is much cheaper than the mass of the prototype due to the use of kaolin instead of dispersion

alumina. Kaolin is cheaper and reactive, in addition, there is no graphite and there is no need to use finely ground periclase. Mass more technological and easy to implement,.

The resulting mass can be used in the manufacture of refractory blocks experiencing significant mechanical stress and exposure to high temperatures.

Claims (1)

Invention Formula A refractory mass, including periclase, an alumina-containing co-component, a phosphate binder, and water, C, in order to improve moldability and increase strength at temperatures from 600 to, it contains kaolin as an alumina-containing component, Zune - Trimetaphosphate sodium in the following ratio of components, May,%: Kaolin9-12 Trimetaphosphate sodium 3-10 Water 2-6 Periclase Else