After a long-time operation, flaky cracks may occur in the furnace’s refractory, which causes the temperature to rise on the surface of steel furnaces and threatens the safety of the furnace structure; with non-hydraulic grouting technology, the non-hydraulic materials can be pressed into the furnace and smoothly enter the damaged refractory cavity, gradually condense and form a high-strength structure which can have a heat insulation effect at the same time.