Permanent lining ramming material for steel ladle

Abstract

The invention discloses a permanent lining ramming material for a steel ladle. The ramming material comprises the following components in parts by weight: 45-47 parts of a magnesia-calcium clinker, 6-8 parts of waste alumina-magnesia spinel firebricks, 10-12 parts of sintering converter slag, 2-4 parts of boron nitride, 3-5 parts of attapulgite, 12-14 parts of ordinary bauxite, 3-5 parts of kaolin, 2-4 parts of asbestos fibers, 3-5 parts of alumina silicate fibers, 4-6 parts of corn starch and 4-6 parts of sodium borate, wherein the content of CaO in the magnesia-calcium clinker is 18%-24%, and is prepared from particles with three particle sizes in a mixing manner; the magnesia-calcium clinker of which the particle sizes are 3-1mm accounts for 2%; the magnesia-calcium clinker of which the particle sizes are 1-0.074mm accounts for 45%; the magnesia-calcium clinker of which the particle sizes are less than 0.074mm accounts for 35%; the waste alumina-magnesia spinel firebricks are prepared from particles with two particle sizes in the mixing manner; the waste alumina-magnesia spinel firebricks of which the particle sizes are more than or equal to 2mm and less than 5mm accounts for 40%; the waste alumina-magnesia spinel firebricks of which the particle sizes are less than or equal to 2mm accounts for 60%; and the particle sizes of the sintering converter slag are -80 meshes.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a permanent lining ramming material for a ladle. Background technique [0002] At present, there are mainly two construction methods for the permanent lining of ladles in the world: one is the early wet brickwork process, and the other is the pouring process adopted in recent years. The former requires high-alumina bricks or magnesia bricks and fire mud to fill the joints. The cost of materials is high, the work is complicated, the labor intensity is high, and the integrity is not good, so there are hidden safety hazards in the later use of the ladle; It is reduced, but the requirements for raw materials are higher, and the construction process is more complicated. It is necessary to increase equipment such as molds, mixers and vibration motors, and increase the process of stirring, pouring, vibration, health preservation, and baking. The overall cost is still h...

AI Technical Summary

Problems solved by technology

The former requires high-alumina bricks or magnesia bricks and fire mud to fill the joints. The cost of materials is high, the work is complicated, the labor intensity is high, and the integrity is not good, so there are hidden safety hazards in the later use of the ladle; It is reduced, but the requirements for raw materials are higher, and the construction process is more complicated. It is necessary to increase equipment such as molds, mixers and vibration motors, and increase the process of stirring, pouring, vibration, health preservation, and baking. The overall cost is still high and is affected by regional humidity. , temperature and other conditions, the popularization and application are limited

[0003] Judging from the published papers on castables and the castables actually used, the castables for permanent ladle lining are made of corundum, spinel, high alumina, mullite, etc. Lining castables not only increase the cost of raw materials and per ton steel cost, but also cause a great waste of resources

Judging from the relevant published patent applications, there is also a permanent lining for ladles developed by using recycled materials such as waste bricks. It is easy to cause deterioration of castable performance, and there is a danger of ladle piercing through the ladle

[0004] Another construction method using ramming material as the permanent lining of the ladle, there are individual reports about this method and the prior art reports on the materials used, such as CN200810190947.8, this patent document uses the ramming material method as an alternative to wet masonry And castable method proposed, its composition is simple, convenient construction, and achieved certain results, but because of its relatively simple components, its working life is short, it is difficult to maintain 2 or 3 contract service, making the permanent lining "permanent" "The two words are greatly discounted