High-performance wet spray coating material for blast furnaces, and preparation method thereof

Abstract

The invention discloses a high-performance wet spray coating material for blast furnaces, wherein the high-performance wet spray coating material comprises, by weight, 45-75 parts of aggregate, 15-25parts of alumina powder, 2-7 parts of spodumene, 5-10 parts of calcium aluminate cement, 0.5-1.5 parts of Guangxi white clay, 2-8 parts of alumina micro-powder, 3-9 parts of silica fume, 1-4 parts ofbrown fused alumina, 0.05-0.5 part of a composite water reducing agent, and 0.5-4 parts of a quick-setting agent. The preparation steps comprise: weighing the raw materials according to the mass ratio; mixing and stirring the aggregate, the alumina powder, the spodumene, the calcium aluminate cement, the Guangxi white clay, the alumina micro-powder, the silica fume and the brown fused alumina to obtain a stirring material a; adding the calcium aluminate cement and the composite water reducing agent to the stirring material a, and stirring; and inspecting, and packaging. According to the present invention, the wet spray coating material has good rheological property during the use, cannot flow and shed after the wet spray coating material reaches the spray coating working surface, has characteristics of significantly reduced rebound rate and increased adhesion rate, and further has high compressive strength and high bending strength after being dried.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a high-performance wet spray coating for blast furnaces and a preparation method thereof. Background technique [0002] During the operation of the blast furnace, the wear, erosion, and shedding of the charge will cause damage to the furnace lining, burnout of the cooling wall, and redness of the furnace shell, etc., which will affect the normal operation of the blast furnace. It is necessary to use spray paint to repair the furnace lining in time. [0003] Spray coatings are divided into dry spray coatings, semi-dry spray coatings and wet spray coatings. In fact, there is not much difference between traditional dry spray coatings and semi-dry spray coatings. When using, a large amount of water is added at the nozzle of the spray gun. The dry or semi-dry spray paint passes through the nozzle of the spray gun at high speed in an instant, and the material and water can...

AI Technical Summary

Problems solved by technology

[0002] During the operation of the blast furnace, the wear, erosion, and shedding of the charge will cause damage to the furnace lining, burnout of the cooling wall, and redness of the furnace shell, etc., which will affect the normal operation of the blast furnace. It is necessary to use spray paint to repair the furnace lining in time

[0003] Spray coatings are divided into dry spray coatings, semi-dry spray coatings and wet spray coatings. In fact, there is not much difference between traditional dry spray coatings and semi-dry spray coatings. When using, a large amount of water is added at the nozzle of the spray gun. Dry or semi-dry spray paint passes through the nozzle of the spray gun instantly at high speed, and the material and water cannot be mixed uniformly

As a result, a series of insurmountable disadvantages have been brought about, such as: water addition is controlled by the spray gunner, and cannot be accurately metered and added according to the design; high-efficiency water reducing agent cannot be added to spray paint, and its water consumption will far exceed that of the same grade. Castables, so its performance will be greatly reduced compared with castables of the same grade; the sprayed layer has become a cumulative layer of water and materials alternately stacked, it is difficult to form a uniform performance and easy to produce layered peeling; a large number of particles in the spray Material rebound, fine powder material scattering, original particle gradation design is completely destroyed, etc.

[0004] Wet spray coatings can solve the above problems very well, but wet spray coatings also have poor rheological properties (that is, pumpability) during spraying, and the sprayed coatings flow on the working surface, rebound and have insufficient mechanical properties after drying. problem that needs to be resolved