Acid Resistant Castables

Acid resistant castables (also called refractory acid-resistant castables or refractory acid-proof castables), also known as refractory castables, is a refractory material that can withstand acid erosion and is extensively used in non-ferrous metallurgy, chemical industry, chimneys, and other applications.

Acid resistant castables adopt special fine coke, primary quartz, and some corundum as aggregate, acid-resistant cement, pure calcium aluminate cement as a binder, and adding ultrafine powder and composite additives. It has the advantages of high-temperature resistance, acid corrosion resistance, and strong wear resistance.

Acid resistant castables have a larger quantity of binding agent and moisture, as well as better fluidity, as compared to other unshaped refractories. Unshaped refractory has a wide range of applications and can be applied by pouring or ramming, depending on the materials utilized and the binding agent employed.

With a density of 1.381.42g/cm3, the acid-resistant castables are made up of 60 percent 70 percent acid-resistant aggregate, 30 percent 40 percent powder, and 13 percent -16 percent sodium silicate solution. Whenever the agent is introduced, the quantity of refractory material that is 10% to 12% of the mass of the sodium silicate solution and resists acidic medium corrosion at 800 to 1200 °C is referred to as acid resistant castables.

The general composition of acid resistant castables is: acid-proof refractory aggregate 60%-70%, powder 30%-40%, plus the density of 1.38-1.42g/cm3 sodium silicate solution 13%-16%, with sodium fluorosilicate as the hardening agent, the addition amount is 10%-12% of the quality of sodium silicate solution. Alkali, hot phosphoric acid, and high fat are not resistant to acid castables.