Classification and preparation of refractory concrete

Refractory concrete is a new type of material, it is with the alum with disabilities cement, phosphate and water glass as cementing agent, mixed with waste brick as aggregate particles with a certain physical properties can be maintained without damage under high temperature.
1.Types of refractory concrete at present: according to the classification of cementing materials:Alum cement refractory concrete;Phosphoric acid refractory concrete;Water glass refractory concrete;Portland cement refractory concrete;Low quality calcium aluminate cement refractory concrete;Magnesia cement refractory concrete;Slag silicate refractory concrete;Lightweight refractory concrete;
According to the use of temperature:Refractory concrete (below 1000 ℃);Medium temperature refractory concrete (below 1200 ℃);High temperature refractory concrete (above 1200 ℃)At present widely used is alum with disabilities cement refractory concrete, phosphate refractory concrete and water glass refractory concrete.
2.Preparation of phosphoric acid refractory concrete
Raw materials: industrial phosphoric acid: acid concentration of 85%, need to dilute, dilute, the phosphoric acid slowly into the hot water, and constantly stirring evenly。Mix proportion: phosphoric acid: water =1:1 (weight ratio). After diluted phosphoric acid is 40 ~ 45%, the specific gravity is as follows: the proportion is as follows: 1. The proportion of the fixed after a day is 1.27 (can be used to measure the gravity meter)Admixture size: <0.008 mm, the content should be greater than 85%. coagulant: No. 400 alum with disabilities cement.Ingredients: mixed trapped material: according to aggregate, admixture =70:30. Preparation of phosphoric acid 5 ~ 6% mixed evenly. Piled up at a temperature of 15 to 25℃, trapped material time is greater than 16 hours. The purpose is to make the trapped material of iron and phosphate the full effect of material, the hydrogen produced in the ramming molding in addition to the front, so as to avoid concrete forming bulging.
Two: the mixed material trapped alum with disabilities cement 3% coagulant by weight of 2 to the material in the mix. After half a minute, then add phosphoric acid to the appropriate thickness (8 ~ 10%), about two times the total phosphate added Na 13 ~ 15%. Alum with disabilities cement (accelerator) with the addition of temperature. When air temperature is high and should be less added or not, such as low temperature should be more appropriate.
Maintenance: after the concrete has been formed, it can be cured in the dry environment at 20 DEG C, and the curing temperature can not be too low
Baking: after the formation of the body before the use of baking is to determine the use of the effect and the life of the furnace body。120 ~ 150 degrees of concrete in the middle of the water out of the basic.450 ~ 500 degrees of concrete in the crystallization of water basic queue.Therefore, the thickness of concrete baked baked more than 400 mm, in order to reduce the refractory concrete temperature difference between inside and outside, can be considered in 800 C, 1000 C, 1300 C temperature stage with holding time.The baking oven, when the temperature rose to 350 degrees above, such as water or steam to produce a large number of ramming making refractory concrete surface, which show that the drainage is intense, to slow the heating time and holding time.

Taurus Refractory ramming mass Factory mainly engaged in professional manufacturer of development, production and sales of the refractory mixture such as melting copper, aluminum and zinc furnace lining. And supply castable refractory for copper smelting, ramming mass for molten copper,fire clay,refractory mortar, refractory cement ,refractory mixture, refractory concrete and silica sand for copper smelting.
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