JPS60141680A - Refractories for patching repairment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a refractory patch for patching repair used for local repair of damaged areas.

Conventionally, for repairing the refractory lining of molten metal containers, stamping materials or patching materials made by adding sodium phosphate or aluminum phosphate gold binder to fireproof aggregate and fireclay have been used as repair refractories. Have you been
These stamp materials have 0) insufficient adhesion;
When large-walled construction or thick-walled construction is carried out, the refractory material is likely to peel or fall off due to its own weight. (3) Separation phenomenon occurs between fireproof material and water or binder due to difference in specific gravity during storage; (2) Due to reaction between aggregate, clay, or fine components contained therein and binder. , easy to cause changes over time such as hardening, etc., were problems in terms of operation and implementation.

In view of the current situation, the present invention was made to propose a monolithic refractory suitable for repairing localized erosion damage, and by adding a mixture of orthophosphoric acid and ultrafine silica powder, The object of the present invention is to provide a refractory for patching repair that is rich in plasticity, has excellent adhesive strength, and has a dense refractory structure.

Hereinafter, one embodiment of the present invention will be explained. The aggregate is a mixture of one or more of chamots, alumina, silica, zircon, rosite, etc., and is divided into coarse, medium, and fine particles. Although it is classified as appropriate, in order to obtain high corrosion resistance as a refractory, chamorous or alumina materials are preferable, and there is no need to make any special difference in particle distribution compared to conventional stamp materials.

Adding fireproof clay to the above aggregate is effective in imparting appropriate plasticity and workability, and ball clay, bentonite, kibushi clay, kaolin, etc. are excellent. The blending ratio is preferably 5 to 15 wt%; if it is less than 5 wt%, the above effects cannot be sufficiently obtained, and if it exceeds 15 wt%, the corrosion resistance of the refractory will decrease.

Orthophosphoric acid, which is the binder material, is used as it is in 85% solution, 75% solution, etc., which is a normal industrial chemical.Orthophosphoric acid brings appropriate viscosity to the patching repair material, and after drying and dehydration, it can be used as a refractory. Contributes to the development of strength.

Silica super-1 relief powder is generally known as anhydrous or hydrated amorphous silicic acid, evaporated silica, etc., but the one used in the present invention is 90% or more of 5i02 and 90% or more of ultrafine powder of 5μ or less. Vaporized silica is preferred.

The ultrafine silica powder improves the adhesion of the patching material and also improves the sinterability at high temperatures.

The orthophosphoric acid-silica ultrafine powder binder is made by adding 30 to 200 parts by weight of silica ultrafine powder to 100 parts by weight of orthophosphoric acid.
) Obtained by mixing JO. The amount of ultrafine silica powder added is 3
If it is less than 0 parts by weight, the relative amount of the solution will increase, resulting in a decrease in viscosity and will not be effective in eliminating the drawbacks (a) to (b) above. If it exceeds 200 parts by weight, the viscosity will increase and the solution will Mixing with the binder can cause problems and further reduce the durability of the refractory used as a binder. Orthophosphoric acid and ultrafine silica powder are mixed in advance before being used as a binder (preferably before 24°C or more Terama).
The reason for this is that ultrafine silica powder has a large bulk, so if it is directly fed into a mixer, it avoids a severe drop in cross-talk. By reacting in advance, the patching material is prevented from deteriorating over time, and since ultrafine silica powder is easily peptized by acid, it is possible to smoothly mix a large amount of ultrafine silica powder up to 200 parts by weight. This is because it has the effect of improving the storage stability of patching materials when used as a binder.

Orthophosphoric acid as a binder thus obtained
Silica ultrafine powder liquid is a mixture of fireproof aggregate and fireclay 10
Add 5 to 30 parts by weight of 0 weight per part. If it is less than 5 parts by weight, there will be a relative shortage of ultrafine silica powder, which is the same as above; however, the disadvantages of B) to (→) cannot be overcome, and if it exceeds 30 parts by weight, the viscosity will be inappropriate and workability will be reduced. This is because it deteriorates the corrosion resistance of refractories.

Next, specific examples of implementing the present invention will be given. As shown in Table 1, fire-resistant aggregate and fire-resistant clay are mixed, a binder is added thereto, and the mixture is kneaded with an ordinary mixer to make a patching material.The separation phenomenon at that time and its properties as a patching material were investigated. The results are also shown in Table 1.

Arashi 1 to 3 are examples of the present invention! 'h4 and 5 are comparative examples in which the amount of binder added is small or large, and Wind 6 is a conventional product.

Separation phenomenon refers to the separation characteristics of whether or not the powder part and solution part separate after adding a binder to refractory aggregate and fireclay and kneading them. Pile it up in a conical shape with the bottom diameter and height approximately equal on the plate, and make sure that the solution does not seep out from around the bottom.
, those that seep into the surrounding area are △, those that flow out from the periphery are ×
It was evaluated by As a result of moisture measurement, it is shown that the mixture with low moisture content is low in preparation and can be kneaded with a small amount of water mixed.This is also correlated with the separation phenomenon, and low moisture content improves the strength of the refractory after hardening. As a matter of fact, N[L1-3 are excellent in these properties, and it can be seen that the ultrafine silica powder acts effectively.

The preservability was determined by placing 2 kq of the mixed material in a sealed container and leaving it to stand still, and measuring the preservability by the number of days until the surface became hardened. Kites 1 to 3 of this example and Comparative Example α5 have good storage stability, while kites containing little or no ultrafine silica powder have poor storage stability.

The skinning phenomenon that inhibits vapor dissipation and causes blistering during drying did not occur with this foil, and stability from mixing to use was ensured.

To measure adhesive strength, bricks of the same quality as the material to be repaired are placed in one side of a mold that is twice the size of the material to be repaired, and the patching material is poured into the cavity and compacted so that the bricks are concentrated. The applied pressure at the time of rupture at the joint was measured. 1*L
The adhesives of Examples 1 to 3 have greater adhesive strength than the comparative example Blood 4.5, and are much better in adhesiveness than the conventional example Na6.

As can be seen from the above explanation, the refractory for patching and repair of the present invention has solved the problems that were inevitable with conventional refractories, and has also achieved effects such as shortening the drying period due to moisture reduction. When it was used as a refractory for repairing damaged parts of tanditshu, there was no occurrence of peeling, falling off, blistering, etc. that occurred in the past, and it improved operational stability and had great benefits in terms of work performance. .

Claims (1)

[Claims] Add 100 parts by weight of a mixture of refractory aggregates such as chamots, alumina, and silica to 100 parts of fireclay and fire-resistant aggregates such as zirconite, and 3 parts ultrafine silica powder to 100 parts by weight of an orthophosphoric acid solution.
A refractory for patching repair, characterized in that 5 to 30 parts by weight of a solution prepared by mixing 0 to 200 parts by weight are added.