SU943214A1 - Raw mix for preparing refractory concrete - Google Patents

Description

The invention relates to building materials and can be used in the manufacture of piece refractory products, mortars, concretes, gunning mixtures. Known refractory mass, inclusive, wt.%: Mixture of aluminum 77-98, chromium oxide 1-25, magnesium oxide 0.10, 5, phosphoric anhydride 0.5-, O 1 J. The disadvantage of this mass is low resistance in the melt sulfur salts. Known refractory mixture, including weight. %: electrocorundum fraction 160-200 µm 30-36, electrocorundum fraction 800-1000 µm 27-32, aluminum-chromophosphate bond 8-9,, 23-35 2. The disadvantage of this mixture is the low resistance in the molten sulfur salts. A known refractory mass, including, by weight, is: corundum 5.78, fine ground technical alumina 10–20, phosphate link 4–16, fine ground magnesite 8–20 3. The closest in technical essence and effect to be achieved is the composition 4J, including, wt.%: Alumochromophosphate binder 10-25 Electro-fused corundum fraction 50-60 µm 20-60 Zircon fraction 150-160 µm6-25 Technical alumina fraction -15 µm 3-10 Phosposite Else The disadvantage of these masses is low melt resistance sulfur salts and short periods of safety technology properties of the mass.

The purpose of the invention is to increase the strength of concrete and stability in the molten sulfur salts.

The goal is achieved by the fact that the raw mix for the production of refractory concrete, including phosphate binder, electrocorundum, alumina, zirconium compound, contains electrocorundum of a fraction of 80 125 microns and 500-600 microns, calcined

the main fraction of the earth is $ 0.08 µm and, as a zirconium compound, a zirconium fraction of 0.15 µm or a zirconium concentrate of a fraction of 0.63 µm, or a stabilized zirconium dioxide fraction of 0.15 µm in the following ratio of components, ppm:

Phosphate Binder 2-10

Burnt Alumina

fraction 0.0810-30

Zirconium compound 5 35

Electrocorundum fraction

80-125 microns and 500-600 microns

The introduction of a finely dispersed additive of a zirconium compound up to 35 causes the formation of zircon aluminophosphates, which are characterized by high stability in melts of sulfurous soda, as well as by the long-term preservation of the technological properties of the mass at normal temperatures.

Example 1. 50 electrocorundum of the 500-600 µm fraction and 10 electrocorundum of the 80-125 µm fraction are mixed with 25 vibrated alumina fractions less than 0.08 µm and with 10% zircon fraction less than 0-15 µm then 5 orthophosphoric acid are added with mixing, and products from the mass after firing in the range of 3001300 C are ready for service at high temperatures.

Example 2. 30% of electrocorundum fraction 500-600 µm and electrocorundum of fractions 80-125 µm, 301 calcined alumina fractions less than 0.08 µm, 5% of zircon concentrate fractions less than 0.63 µm are mixed with 10 aluminum chromophosphate binder.

Products from the mass after heat treatment at 300-1300 ° C are suitable for service at high temperatures in the melt of sulfur sols:

Example 3. The electrocorundum fraction of 500-600 microns and 20X electrocorundum of the 80-125 micron fraction are mixed with 10% burnt alumina fraction of less than 0.08 micron and 35 of stabilized zirconia less than 0.15 micron. Orthophosphoric acid is then added. Mass ready for use.

Properties of refractory concrete, proposed and known compositions are given in the table.

Thermal stability from 800 C - air

Heat resistance from 1300 С - water

Stability in the melt of salt, h

8-50

Not tested

58

65

72

56

38

62

0.3-0.5

The use of refractory Oeton saves 10-12 rubles / m of lining.

Claims (3)

1. US patent number 38628 5, class. 106-59, 1975 / 2. USSR author's certificate number 461077, cl. C 0 B, 29/02, 1975. 3. Authors certificate of the USSR N 421673, cl. C 0 8 35/18, 1975. 4, USSR Author's Certificate N 610823, cl. C B 29/02, 1376.