Refractory concretes GOST in the steel industry for furnace manufacturers to purchase their hand-blend lining

Refractory concretes of phosphates and the technology of their production.

 

 

Production technology allows to produce a bunch of “phosphate concrete – phosphate cement” for the manufacture of refractory products of any complexity, in which the suture coupling strength actually exceeds the strength of phosphate concrete. Such phosphate refractory concretes have a high degree of homogeneity, accuracy of geometric dimensions, stability, performance.

 

Description

Physico-mechanical characteristics of refractory phosphate concrete

Advantages

 


Description:

Refractory concretes of phosphate – a new kind of refractory materials. Phosphate refractory concretes are produced on alumophosphates bundle in the form of orthophosphate of aluminum and high-purity crystalline fillers (electrocorundum, silicon carbide) to produce alumina (up to +1800°C), silicon carbide (up to +1000°C) phosphate concretes with different characteristics.

The original technology of formation of the phosphate concrete under pressure and firing the finished products to +900°C can produce products of almost any configuration (including thin-walled and high forms), and provides for high degree of homogeneity, accuracy, geometrical dimensions, stability, performance.

Production technology allows to produce a bunch of “phosphate concrete – phosphate cement” for the manufacture of refractory products of any complexity, in which the suture coupling strength actually exceeds the strength of phosphate concrete.

 


Physico-mechanical characteristics of phosphate refractory concretes:

Features:

Value:

Operating temperature, °C

to +1800

Density, kg/m3

3000 – 3100

Total porosity, %

8,0 – 25,0

Compressive strength, MPa, not less

30 – 50

The coefficient of linear expansion, K-1

7×10-6

Thermal conductivity, W/(m*K)
at 100°C
at 1000°C

0,23 – 30,0
0,25 – 25,0

Changes in the thermal characteristics at the time of the process

dramatically increasing the strength and elasticity

Thermal resistance*

>>100

*- The number of cycles of heating to 1200°C and abrupt water cooling to 25°C.

The resistance of some other refractories: Dinas – 1÷2; chamotte – 10÷25; high-alumina – 15÷20; magnesia – 1÷2; periklazokhromntovykh – 5÷20.

 

Advantages:

The advantages of phosphate concretes in the claimed temperature range:

the lack of effects of shedding and cracking due to the low porosity and high strength of phosphate concrete,

– the hardness of the material (7,5 – 8,5 Mohs) allows to produce plate size 400×400 mm (including hearths ovens),

chemical purity of the material pods, acid resistance and resistance to oxides of carbon allows the use of phosphate concretes in aggressive environments.