SU1578107A1 - Refractory compound - Google Patents

Abstract

The invention relates to the manufacture of refractories and can be used in metallurgy and power engineering for the manufacture of monolithic linings and protective coatings. The purpose of the invention is to increase adhesion to the surface to be protected, resistance in slags and thermal resistance. A refractory mass containing an aluminosilicate filler, a phosphorate binder, a waste of an alumina chromium catalyst and a plasticizer, contains a high alumina chamotte as an aluminosilicate filler and additionally alumina in a mixture of joint grinding with a waste of alumina chromium catalyst and a plasticizer taken in a ratio of 0.05: 0.8 : 0.15 - 0.25: 0.5: 0.25, in the following ratio, wt.%: Phosphate binder 5-18

mixture of joint grinding of alumina with wastes of alumina chromium catalyst and plasticizer 30-45

high-alumina chamotte rest. The invention allows to increase the heat resistance up to 25-28 heat cycles, increase the stability in the slag and increase the adhesion by 2-2.5 times. 2 tab.

Description

The invention relates to the composition of refractory masses and can be used in metallurgy and power engineering for the manufacture of monolithic linings and protective coatings.

The purpose of the invention is to increase adhesion to the surface to be protected, resistance in slags and thermal resistance.

The refractory mass is prepared as follows.

Example 1 and 6. Pre-heat treated at 1600-1650 C a mixture of aluminum chromium catalyst waste,%: A1-00 72-73; Cr, 0 4; SiOi 9S5; (TU 38-103-544-83)

and a plasticizer (clay according to TU 14-8-218-75), taken in a ratio of 0.8: 0.2, was crushed, crushed, and a mixture of joint grinding from ground briquette, plasticizer and alumina was prepared, with the final ratio of aluminum chromium waste catalyst, plasticizer and alumina, should be equal to 0.8: 0.15: 0.05. Kyanite chamotte (sod. A1gO-, 65%) is moistened with 10% orthophosphoric acid, stirred, the mixture is added to the joint grinding and mixed again. The total mixing time should be 15-20 minutes. Ich masses are molded

ate 1

00

At a specific pressure of 20 MPa, the samples are heat treated and the properties are determined.

Example 2.4 and 7, 60% of a mixture of joint grinding from waste aluminum-chromium catalyst, corundum fireclay containing A1203- 97% and kaolin according to TU 14-8-160-75, taken in the ratio listed in the table, briquetted, heat treated at 1600 ° C, crushed and mixed with the remaining 40% crude mixture.

High-alumina chamotte containing A1 0372% moisten the binder according to Table 1, mix, add a mixture of co-milling, form samples at a specific pressure of 60 MPa, heat-treat at i400-1500 ° C and determine the properties .

Example and 5 “Prepare a mixture-joint grinding from waste of an electro corundum and bentonite glumeochromic catalyst in accordance with GOST 3226-77 in the ratio: for a mass of 1-0.65:: 0.30: 0.05, for a mass of 0.9: 0 , 08; : 0.0 / and this mixture is injected with a precursor. When moistened chamotte with a content of 68% s, the mass is stirred for 10 min, the samples are molded at a pressure of 20 MPa, the thermoprocessing is processed at 15GO-1600 ° C and determined em properties

Properties of prototypes are given in table 2.

The content in the mass of the mixture of joint grinding in the amount of 30-40% provides the most dense structure of the lining both during its application and after heat treatment. When its content is less than 30%, the packing density of the grains in the volume is small due to the lack of finely dispersed constituent, and when it is in excess of over 45%, repressions and microcracks are formed, which also reduce the lining density and, consequently, its stability in aggressive slags

When the content in the mixture of joint grinding of the lumochrome catalyst waste is less than 50%, the wettability of the lining with metals and slags and, consequently, its wear, increases due to the decrease in chromium oxide in it. Increasing this component by more than 80% is impossible due to the need to introduce a sufficient amount (at least 15%) of a plasticizer, which

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$ g

5 n

" with

five

0

five

determines the adhesion of the mass and sintering. linings. It is not practical to increase the plasticizer over 25% in the ERP, since this component dramatically increases the sintering of the mass, the binder detaches from the filler grains, cuttings appear and the wear of the metal and slag increases due to their permeability to the refractory, the heat resistance and strength decrease. When the corundum content in the bond is less than 5%, after heat treatment, a significant amount of glass phase introduced by clay is formed, and consequently, the durability of the lining decreases, and as the corundum increases by more than 25%, the product growth increases in firing, cracks appear, and the durability decreases.

The prototype is made from the mass of the composition, wt.%:

Chamotte with content

A1gOe 37% 63

Chromite5

Alumina chromic

catalyst) 0

Clay10

Phosphoric acid 12

The components were mixed, moistened with a binder, the samples were molded at a specific pressure of 20 MPa, and heat treated at 1400–1500 C.

Claims (1)

As can be seen from table 2, the stability in the slag of experimental samples compared with the prototype is higher by 25-40%, the tensile strength and heat resistance are 2 times higher. Invention Formula The refractory mass, including an aluminosilicate filler, a phosphate binder, a waste of an alumina chromium catalyst and a plasticizer, is characterized in that, in order to increase adhesion to the protected surface, stability in slags and thermal stability, it contains high-alumina chamotte and thermal stability. - alumina in a mixture of joint grinding with waste chromium catalyst and plasticizer taken in a ratio of 0.05: 0.8: 0.15-0.25: 0.5: 0.25 in the following ratio, wt.% : Phosphate Binder 5-18 The mixture of joint grinding alumina with zlkgmohromovogo waste catalyst and plasticizer 30-45 High alumina fireclay Table Rest, High alumina fireclay Mixture of joint grinding chromium catalyst alumina, plasticizer when their ratio: 0.80: 0.05: 0.15 0.5: 0.25: 0.25 0.6: 0.2: 0.2 0.4: 0.3: 0.3 0.84: 0, 08: 0.08 Phosphate binder orthophosphoric acid Alumochrompho spat binder tripolyphosphate nari Indicators .riroziJTiini 73 115 91 40 27 28 26 25 5 4 9.5 12.1 9.0 19 17  . 13 15 13 60 55 30 40 77 50 20 35 thirty 50 ten 15 20 table 2 Samples iJTiini Prototype 45 13 45 4 8 10 18 sixteen thirty