SU791690A1 - Refractory concrete mix - Google Patents

Description

one

The invention relates to the composition of a refractory concrete mixture used, for example, for the production of heat-resistant structures of glass melting furnaces or other thermal units with a temperature of service.

Also known refractory mass, including, wt.%:

Shamot6O-75

Clay6-1O

Alumochrome

phosphate bond 4-6

Chromite 3-5

Technical

alumina-15

Magnesite2-4 flj.

The disadvantages of this composition are low slag resistance and short service life of the resulting material.

The closest to the essence of the technical solution and the achieved effect of the proposed invention is a refractory concrete mix, including, wt.%:

Phosphate

9-2 g

binder

Fire clay

7-12

Hydroxide

3-7

aluminum

Alumina 27-41

Fine

amorphous silica1-3 zem Else JL2.J.

Fireclay

ten

The disadvantages of this composition are low slag resistance, a large open prrhnost and a short service life of the material obtained.

The aim of the invention is to increase slag resistance, decrease porosity and increase the service life of products.

This is achieved by the fact that the refractory concrete mixture, including phosphate

20 Noah "binder, alumina, kaolin, aluminum hydroxide, chamotte and additive, contains orthophosphoric acid with a density of 1.471, 52 g / cm as a binder, and boric anhydride or boric acid as an additive in the following ratio, wt. %: Orthophosphoric acid with a density of 1.47-1.52 8-20 Alumina26-35 Kaolin8-12 Aluminum hydroxide 5-7 Boric anhydride or boric acid2-4 FireclayOther Introduction to a concrete mixture of boron compounds promotes the formation of mobile, polymeric borophosphato chains that are jointly with polymer al m and silicate phosphates form a dense structure at medium temperatures and form a final structure with low porosity at high temperatures, able to withstand the aggressive effects of industrial slags. Example I. In a concrete mixer, a mass of the following composition is prepared, the weight of chamotte 22, alumina 35, kaalkn 12, aluminum hydroxide 7, boric anhydride 4, orthophosphoric acid (density 1.5 g / cm) 2O. The components are thoroughly mixed to obtain a homogeneous mass and the product is formed with semi-dry lipeccoBamieM with a single force of 150 kgf / cm. After molding, the product is heat treated at a temperature of 150–18 ° C for 12–16 h, after which they are ready for operation. P roman er 2 (with an optimal ratio of components). In a concrete mixer, a mass of the following composition is prepared, wt.%: Chamotte 42, alumina 22, kaolin II aluminum hydroxide 6. boric anhydride 3, rthophosphoric acid (density 1.5 g / cm) 16. The technology for preparing a concrete mix is similar to the technology of example I Froze. In a concrete mixer, a mass of the following composition is prepared, wt.%: Chamotte 51, alumina 26, kaolin 8, aluminum hydroxide 5, boric acid 2 orthophosphoric acid (density 1.5 g / cm) 8. The technology of concrete preparation is similar to the technology of example I .- The main physicomechanical ha - .. characteristics of the resulting material and the prototype, confirmed by the test act, are shown in the table.

Seeming density

kg / mA

Strength at j

compression, kgf / cm

Porosity is open,%

Slag penetration rate, mm per month

Claims (2)

1. USSR author's certificate Ni 619467, cl. C O4 B 33/22, 1977. 2. USSR author's certificate for application number 26O7138 / 29-33, cl. C Q4 e 29/02, 1978.