Mortise arch brick of sulfur production furnace

The utility model discloses a mortise arch brick of a sulfur production furnace, and belongs to the technical field of a refractory material for a sulfur production furnace as a sulfur recovery unit. The mortise arch brick of the sulfur production furnace is characterized by comprising an arch brick body (1), wherein the top face and the bottom face of the arch brick body (1) are respectively planes with a corresponding same central angle (A); the middle-upper parts of the front and back faces of the arch brick body (1) are provided with corresponding splicing parts; adjacent bricks are spliced together through the splicing parts. The arch brick, disclosed by the utility model, is small in mass, the laying is labor-saving, mouth locking is convenient, the arch brick is provided with a groove and a boss, thus the integrity of a hearth is guaranteed, and the phenomena such as flame out due to brick joints and overtemperature are effectively prevented.