The gap between the bricks in the brick ladle masonry is called the ladle joint. The tank bottom masonry has horizontal joints between brick layers and vertical vertical joints perpendicular to the horizontal joints. The tank wall annular masonry has brick layer horizontal joints and vertical joints in the radial direction perpendicular to it - radial vertical joints.
With the emergence of continuous casting ladle and refining ladle, the temperature of molten steel in the tank is increased and the residence time of molten steel in the tank is prolonged, and the tank lining is changed to alkaline bricks and carbon-containing bricks. In the case that ordinary ladle has been upgraded to refined ladle, the tank lining should have been upgraded to Class I masonry. Most of the foreign refined ladle brick linings have been changed to Class I masonry, such as the foreign ASEA-SKF ladle chrome magnesia brick working lining, and the thickness of the cladding joints does not exceed 1mm. However, the thickness of the joints of the lining of the refined ladle bricks in my country has not been reduced to not more than 1mm, and the joints of no more than 2mm of ordinary ladle are still used in the past. The thickness of the joints of the lining of refined ladle bricks in my country can be transitioned from the current no more than 2mm to no more than 1.5mm, and strive to be no more than 1mm, which is completely achievable.
The working lining of the refined ladle is upgraded to Class I masonry, and the measures in terms of brick size (such as brick selection and molding) when the thickness of the joint is not more than 1mm:
(1) For the straight-shaped bricks at the bottom of the tank, the refractory brick manufacturers are classified according to thickness, marked with positive and negative signs, and supplied in batches.
(2) For the long wedge-shaped bricks on the flat side of the tank wall (including universal bricks or semi-universal bricks), bricks are selected according to thickness in the refractory brick factory, marked with positive and negative signs and supplied in batches.
(3) For vertical wedge-shaped bricks with thick sides, select bricks according to the brick layer height (brick size B) in the refractory brick factory, mark them with positive and negative signs, and supply them in batches.
(4) For flat vertical wide wedge-shaped bricks, the bricks are selected according to the brick thickness (brick size B) in the refractory brick factory, marked with positive and negative signs and supplied in batches.
(5) For vertical wide wedge-shaped bricks and side-thick wedge-shaped bricks, the forming taper of the height dimension of the brick layer is not expected to exceed 0.5%, and the upper or lower brick surface under pressure (equivalent to the upper cover plate or lower floor) markings for easy identification during masonry operations.