Laying quality directly decides lining tightness and life. Joint control comes first: high-temperature furnaces usually require joints ≤2 mm (≤1 mm at critical zones), medium/low-temperature furnaces 2–3 mm. Oversized joints let gas and slag penetrate — a leading cause of early failure.
Lay in staggered courses so vertical joints never align; install shaped and curved bricks by number for tight fit. Mortar must match the brick: high-alumina mortar for high-alumina brick, silica mortar for silica, magnesia mortar for magnesia — and check joint fullness to ensure dense beds.
Expansion joints are equally critical: calculate width and spacing from the brick’s expansion coefficient and furnace temperature, and place them away from load-bearing structures. Cold-state laying must reserve expansion allowance, or bricks will crush each other during heat-up.
Site conditions matter too: insulate against frost in winter and protect mortar from moisture in rain. Songrui provides laying plans and on-site technical guidance.
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