Silica sol bonded corundum refractory mortar

Abstract

The invention discloses silica sol bonded corundum refractory mortar. The refractory mortar is prepared from corundum, green clay, quartz powder, yellow dextrin, carboxymethyl cellulose, alumina micro-powder, a water reducing agent and silica sol. The refractory mortar has high normal-temperature bonding strength and medium-high temperature bonding strength, is micro-expansive after being fired atthe high temperature of 1,500 DEG C, has high refractoriness under load and full mortar joints, emits no irritating odor in a using process and is harmless to the human body and equipment, paving seams are compact in a long-term high-temperature operating process of an industrial furnace and are not cracked, completeness and gas tightness of masonry are guaranteed, and the service life of the furnace is prolonged.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials, in particular to corundum refractory mud combined with silica sol. Background technique [0002] In the prior art, corundum refractory mud in various high-temperature industrial kilns is mainly used to build corundum refractory bricks. In the process of long-term use, the damage of brick lining is mainly from the brick joints, that is, the damage of refractory mud. start. Refractory mud is a weak point that affects the safety and stability of industrial kilns and prolongs the life of kilns. There are generally two types of water-based refractory mud prepared by traditional technical means, one of which can be used directly after adding water and stirring, and this kind of mud generally has low bonding strength; the other is used after adding phosphate solution and stirring, this kind of mud The bonding strength is high, but phosphate will reduce the load softening temperat...

AI Technical Summary

Problems solved by technology

There are generally two types of water-based refractory mud prepared by traditional technical means, one of which can be used directly after adding water and stirring, and this kind of mud generally has low bonding strength; the other is used after adding phosphate solution and stirring, this kind of mud The bonding strength is high, but phosphate will reduce the load softening temperature point of the material, and phosphate is acidic, which is corrosive to the human body and construction equipment. For example, general mud mixing equipment is made of iron, and phosphate will interact with Iron reacts and brings iron into the refractory mud, which deteriorates the performance of the refractory mud

The low load softening temperature point indicates that the material has poor high temperature resistance. Under the long-term high-temperature operation of industrial kilns, the mud is easy to soften and lose strength, resulting in kiln deformation, brick drop, and even collapse.

In addition, these two types of mud generally shrink greatly during the high-temperature operation of the kiln, which may easily cause the bonding surface between the brick and the refractory mud to separate, or cause cracks and gaps, resulting in poor airtightness of the masonry and air leakage.

Images