Lightweight acid resistant castable

Lightweight acid-resistant castables are mainly used in anti-corrosion flue and chimney linings, acid storage tanks, pickling tank linings, nitric acid shrinkage tower linings, acid recovery furnace linings and other refractory castables corroded by acidic high-temperature gases. It can improve the air tightness and integrity of the lining wall and the corrosion resistance of the lining. It is currently a widely used refractory material.

Brief introduction of lightweight castables

Lightweight acid-resistant castables are composed of lightweight aggregates, powders, binders and additives, and the main component of the binder is water glass. The lightweight aggregate structure has a large porosity, a rough surface, and a particle size of about 5mm. The aggregate and powder have high water absorption and hygroscopicity, and poor fluidity after mixing according to the mix ratio. The product has good physical and chemical properties, with low bulk density, fast solidification when adding water, high operating temperature, compressive strength increases with the increase of temperature and acidity, low thermal conductivity, and low linear expansion coefficient.

Physical and chemical indicators of lightweight acid-resistant castables

Item		RS-1	RS-2
Bulk Density	g/cm3	0.8+-0.2	1.2+-0.2
Cold Crushing Strength	110℃*24h	7.5	10
	400℃*4h	7.5	10
Cold modules of rupture	Mpa	1	1
Acid resistance (40%sulfuric acid soak, 48hcompressive strength)	Mpa	7.5	10
Long-term use temperature	℃	600
Initial condensation	45
Final condensation	10

Characteristics of acid-resistant castables

Lightweight: The castable uses lightweight aggregates or additives such as foaming agents to give it a lower density, thereby reducing the deadweight of the structure. This helps to reduce equipment load and reduce energy consumption.

Acid resistance: Lightweight acid-resistant castables use special aggregates and binders with good acid resistance. It can resist the erosion of acidic media and maintain the stability and durability of the structure.

Temperature resistance: The castable has a certain high temperature resistance and can maintain the stability and performance of the structure in a high temperature and acidic environment.

Easy construction: Lightweight acid-resistant castables have good castability and plasticity, and are suitable for structures of various shapes and sizes. It can be constructed by pouring, spraying, etc., which is convenient for coating and maintenance of complex structures.

Application of lightweight acid-resistant castable

1. Lightweight refractory and acid-resistant castables are suitable for alkali-resistant corrosion-resistant parts at high temperatures.
2. Lightweight refractory and acid-resistant castables are suitable for high chimneys, high-temperature flues, and duct linings.
3. Lightweight refractory and acid-resistant castables are used for acid-resistant projects of acid-resistant storage tanks and tanks in the petroleum, chemisch, nonferrous metallurgy and other industries.