Method for producing ladle joint material by utilizing waste corundum bricks

Abstract

The invention discloses a method for producing a ladle joint material by utilizing waste corundum bricks. The method comprises the following steps of: conveying 35 parts of 1-8 mm waste corundum brick granules, 35 parts of 0.1-8 mm white fused alumina granules, 10 parts of powder materials, 10 parts of alumina powder, 3 parts of fused magnesia powder, 1 part of silica powder and 6 parts of calcium aluminate cement into a stirrer, and fully stirring to obtain the ladle joint material finished product. The obtained ladle joint material finished product has the physical and chemical indexes as follows: after the ladle joint material is dried at the temperature of 110 DEG C for 24 hours, the compressive strength is more than 40MPa, and the flexural strength is more than 5MPa; and after the ladle joint material is sintered at the temperature of 1550 DEG C for 24 hours, the bulk density is not less than 3.0 g/cm<3>, the flexural strength is more than 12MPa, and the linear change rate is +/-0.5%. In the method disclosed by the invention, 1/3 of waste corundum brick granules are used as aggregates, thus the cost of the ladle joint material and the cost of per ton of steel are greatly lowered; and calcium aluminate cement is used for binding, and alumina, fused magnesia and silica are used as media, thus the problem that the recovered waste corundum brick granules are easy to crack when used in high-grade pouring materials is solved, and the requirements for safety and durability of the ladle are achieved.

Description

technical field [0001] The invention relates to refractory materials, in particular to a method for producing ladle joint material by using waste corundum bricks. Background technique [0002] The ladle joint material is mainly used for the part of the ladle's overall air-permeable brick, nozzle seat brick, air-permeable seat brick and magnesia-carbon brick. The main materials include corundum spinel, chrome corundum or aluminum-magnesia. Judging from the published articles on the recycling of waste refractory materials, the recycling of high-grade materials such as integral air-permeable bricks, corundum seat bricks, and nozzle seat bricks after ladle removal is limited to the production of high-alumina bauxite particles and grinding powder. Fire clay, or used as ramming material, plastic, etc., has a relatively narrow application range and the cost reduction is not obvious. Because it is easy to crack even if a small amount of waste corundum brick particles are added to h...

AI Technical Summary

Problems solved by technology

Since it is easy to crack even if a small amount of waste corundum brick particles are added to high-grade castables, the possibility of using waste corundum bricks to replace large amounts of corundum particles of the same grade is limited.