CN112823147B

CN112823147B - Hot filling material

Info

Publication number: CN112823147B
Application number: CN201980065524.XA
Authority: CN
Inventors: 本田和宽; 白曼统一; 赤井哲; 中道翼; 大野洋辅
Original assignee: Krosaki Harima Corp
Current assignee: Krosaki Harima Corp
Priority date: 2018-10-22
Filing date: 2019-10-17
Publication date: 2022-06-03
Anticipated expiration: 2039-10-17
Also published as: TWI752363B; CN112823147A; TW202021931A; JP6470866B1; WO2020085191A1; JP2020066537A

Abstract

The purpose of the present invention is to improve the filling properties of a hot-fill material. Specifically, the present invention provides a hot-fill material obtained by adding a binder and water to 100 mass% of a refractory raw material, wherein the hot-fill material contains 25 to 60 mass% of a basic raw material having a particle diameter of 1mm or more and 5 to 25 mass% of a basic raw material having a particle diameter of 20 μm or more and less than 106 μm in a proportion of 100 mass% of the refractory raw material, and the content of the basic raw material having a particle diameter of less than 20 μm in a proportion of 100 mass% of the refractory raw material is 30 mass% or less (including 0).

Description

Hot filling material

Technical Field

The present invention relates to a hot fill material.

Background

One mode of use of the hot fill material will be described by taking an example of the replacement operation of the steel outlet sleeve of the converter.

As shown in fig. 1(a), first, the converter 1 after tapping is tilted about the pivot shaft 2 so that the tap hole 3 approaches the table 4. The operator uses a breaker 5 to break down the old jacket tube 6 and remove it from the tap hole 3.

As shown in fig. 1(B), the converter 1 is then tilted about the pivot shaft 2 so that the tap hole 3 faces downward, and a new sleeve 7 is fitted into the tap hole 3. Next, the hot fill material 8 is discharged into a gap (hereinafter referred to as a "construction target site") between the new casing 7 and the main body of the converter 1 using the discharge device 9 so that the construction target site is filled with the hot fill material 8.

The hot-fill material 8 is obtained by adding a binder and water to a refractory material containing an alkaline material. In the example of fig. 1(B), water is added to the discharge pipe 10 of the discharge device 9. The temperature of the site to be worked is, for example, about 600 to 1000 ℃, and the hot-fill material 8 boils immediately after filling. The hot filler 8 is stirred in the portion to be worked by the force of the boiling, and is tightly filled in the portion to be worked. After the boiling and settling, the hot-fill material 8 is cured by the bonding action of the adhesive (see, for example, patent document 1).

Such a hot-fill material is required to have, as its basic characteristic, a filling property into a gap as in the above-described site to be worked, but the filling property has been insufficient in the past.

Patent literature

Patent document 1: japanese patent No. 4960906

Disclosure of Invention

The invention aims to improve the filling property of a hot filling material.

Since the thermal filling material is filled into the gap, if curing occurs before filling into the gap, the filling property deteriorates (the filling property into the gap cannot be ensured). Accordingly, the present inventors have made experiments and studies with a view to the particle size structure of the alkali raw material constituting the hot-fill material, and as a result, have found that when an appropriate amount of the alkali raw material having a particle size of 20 μm or more and less than 106 μm is contained, the hot-fill material is easily filled into the gap, and the solidification occurs after the gap is filled.

That is, according to an aspect of the present invention, the following hot fill material can be provided.

A hot-fill material comprising a refractory raw material and, added thereto, 100% by mass of a binder and water,

contains 25 to 60 mass% of a basic material having a particle diameter of 1mm or more and 5 to 25 mass% of a basic material having a particle diameter of 20 μm or more and less than 106 μm in a proportion of 100 mass% of the refractory material,

the content of the alkaline material having a particle diameter of less than 20 μm is 30 mass% or less (including 0) in terms of the proportion of 100 mass% of the refractory material.

The particle size in the present invention means the size of the mesh when the refractory raw material particles are screened and separated by a sieve, for example, the alkaline raw material having a particle size of less than 20 μm means the alkaline raw material having passed through the sieve having a mesh size of 20 μm, and the alkaline raw material having a particle size of 20 μm or more means the alkaline raw material having not passed through the sieve having a mesh size of 20 μm.

According to the present invention, the filling property of the hot-fill material can be improved.

Drawings

Fig. 1 is a diagram showing one usage form of the thermal filler.

Fig. 2 is a diagram showing a brick group used for evaluation of filling property.

Description of the symbols

1-converter; 2-a pivot; 3-tapping hole; 4-a workbench; 5-a crusher; 6-old casing; 7-new sleeve; 8-hot fill material; 9-a spitting device; 10-a discharge pipe; 11-brick group; 11 a-magnesia carbon brick; 12-gap.

Detailed Description

The hot-fill material of the present invention contains 5 to 25 mass% of an alkaline material having a particle diameter of 20 to less than 106 μm, based on 100 mass% of the refractory material. Although the alkaline raw material dissolves Mg²⁺Ion, Ca²⁺Ions, the dissolved Mg²⁺Ion, Ca²⁺The ions react with the binder or the like to contribute to curing of the work, but the specific surface area of the alkaline material having a particle diameter of 20 μm or more and less than 106 μm is appropriate, so thatThis is to elute Mg at an appropriate elution rate²⁺Ion, Ca²⁺Ions. Therefore, by containing the alkali material having a particle size of 20 μm or more and less than 106 μm in an appropriate amount, the applied body can be cured at an appropriate timing. Further, by containing the alkali material having a particle size of 20 μm or more and less than 106 μm in an appropriate amount, the fluidity of the hot-fill material can be improved, and gap filling can be facilitated. That is, since the hot-fill material containing 5 to 25 mass% of the alkali material having a particle size of 20 μm or more and less than 106 μm is easily filled into the gap and is cured after the gap is filled, the filling property into the gap can be improved.

When the content of the alkaline raw material having a particle diameter of 20 μm or more and less than 106 μm is less than 5% by mass, the applied body is not cured or it takes a long time to cure the applied body, which may cause an obstacle to practical operation. On the other hand, if the content of the alkaline material having a particle size of 20 μm or more and less than 106 μm exceeds 25 mass%, the gap is once filled with the alkaline material, but the applied body shrinks by heat to form a gap again.

The content of the alkaline material having a particle diameter of 20 μm or more and less than 106 μm is preferably 10 mass% or more and 20 mass% or less.

The hot-fill material of the present invention contains 25 to 60 mass% of an alkaline material having a particle diameter of 1mm or more based on 100 mass% of the refractory material. When the content of the alkaline material having a particle size of 1mm or more is less than 25% by mass, the balance of the particle size composition of the refractory material is deteriorated, and the strength of the worked article is lowered. On the other hand, when the content of the alkaline material having a particle size of 1mm or more exceeds 60 mass%, voids increase in the worked article, and the strength of the worked article is still reduced.

The content of the alkaline raw material having a particle diameter of 1mm or more is preferably 30% by mass or more and 50% by mass or less.

In the hot-fill material of the present invention, the content of the alkaline raw material having a particle size of less than 20 μm is 30% by mass or less (including 0). When the content of the alkaline raw material having a particle size of less than 20 μm exceeds 30 mass%, Mg²⁺Ion, Ca²⁺The ions are eluted too fast and fill the gapsCuring occurs before and thus uniform filling cannot be achieved. The content of the alkaline raw material having a particle diameter of less than 20 μm is preferably 20% by mass or less (including 0).

The hot-fill material of the present invention may or may not contain an alkaline material having a particle size of 106 μm or more and less than 1 mm.

As the alkali material, an alkali material generally used for a hot-fill material can be used, and examples thereof include magnesia, dolomite, olivine, brucite, calcium carbonate, magnesia-carbon type, and the like. The hot-fill material of the present invention may contain alumina, spinel, silicon carbide, alumina-silica, and the like as a refractory material other than the basic material.

SiO, which is a preferable example of the hot-fill material of the present invention, is contained in the refractory raw material in an amount of 100 mass%₂And Fe₂O₃Is 3.2 to 7 mass%, and Fe₂O₃The content of (b) is 1.5% by mass or less (including 0). SiO 2₂And Fe₂O₃Can form compound with MgO and CaO in alkaline raw material to inhibit Mg²⁺Ion, Ca²⁺The effect of ion elution. Therefore, although the increase in viscosity and the decrease in filling property due to the early solidification of the work can be suppressed, SiO is used₂And Fe₂O₃When the total amount of (B) is less than 3.2% by mass, Mg inhibition cannot be sufficiently exhibited²⁺Ion, Ca²⁺The effect of ion elution. On the other hand, when SiO₂And Fe₂O₃When the total amount of (B) exceeds 7 mass%, Mg²⁺Ion, Ca²⁺The ions are less than the proper elution rate and become hard to solidify. SiO is preferred₂And Fe₂O₃The total amount of (B) is 3.2 to 5.5 mass%.

In addition, since when Fe₂O₃When the content of (b) exceeds 1.5 mass%, a low-melting-point compound is generated, which may lower the corrosion resistance, and therefore Fe is preferable₂O₃The content of (b) is 1.5% by mass or less (including 0).

Here, Fe₂O₃In the content of (A) is that X-ray fluorescence analysis is used for testingThe amount of Fe in the sample was measured and converted into oxides (Fe)₂O₃) The latter content. Likewise, SiO₂The content of (A) is determined by detecting the amount of Si in the sample by X-ray fluorescence analysis and converting the amount into oxide (SiO)₂) The latter content.

The hot-fill material of the present invention is a hot-fill material obtained by adding a binder and water to 100% by mass of the refractory raw material described above.

As the binder, a binder generally used for a hot-fill material can be used, and examples thereof include phosphate, silicate, asphalt, powdered resin, and alumina cement, but typically, a binder containing at least 1 selected from phosphate and silicate can be used. Examples of the phosphate include sodium phosphate, potassium phosphate, lithium phosphate, calcium phosphate, magnesium phosphate, and aluminum phosphate, and examples of the silicate include sodium silicate, potassium silicate, and calcium silicate. The amount of the binder added may be, for example, 1 mass% or more and 10 mass% or less based on 100 mass% of the refractory raw material, as in the case of a general hot-fill material.

In addition, additives may be used in the binder. As the additive, various additives such as a curing agent, a dispersing agent, and a thickener can be used. For example, hydrated lime may be used as the curing agent, phosphate may be used as the dispersant, and clay may be used as the thickener.

The amount of water added may be 30 to 60 mass% based on 100 mass% of the refractory raw material, for example, as in the case of a conventional hot-fill material.

The hot-fill material of the present invention as described above may be discharged by air using the discharge device 9 as shown in fig. 1(B), or may be poured without using the discharge device 9, or may be charged into a container that can be burned.

Examples

Tables 1 and 2 show the composition of the refractory raw materials and the evaluation results of examples of the present invention and comparative examples. In tables 1 and 2, magnesium oxide was used as the "basic raw material" in addition to example 8, and magnesium oxide and dolomite were used in combination in example 8. The evaluation items and evaluation methods are as follows.

< filling >

After the brick set 11 was heated to 1000 ℃, the hot-fill material of each example obtained by adding an appropriate amount of binder (sodium phosphate) and water to the refractory raw materials of each example shown in tables 1 and 2 was poured into the quadrangular pyramid-shaped gap 12 having an angle of 15mm × 230mm formed in the brick set 11 (combination of 4 magnesia carbon bricks 11 a) as shown in fig. 2. After cooling, the brick set 11 was cut to confirm the filling property into the gap 12 (the size of the gap not filled). In the evaluation of the filling property, the case where there was no unfilled gap or the size of the unfilled gap was less than 1mm was regarded as o (good), the case where the size of the unfilled gap was 1mm or more and less than 2mm was regarded as Δ (acceptable), and the case where the size of the unfilled gap was 2mm or more was regarded as x (not acceptable).

< strength of construction body >

The hot-fill material of each example obtained by adding an appropriate amount of a binder (sodium phosphate) and water to the refractory raw materials of each example shown in tables 1 and 2 was poured into a mold heated to 1000 ℃, boiled and solidified, cooled to normal temperature, and taken out of the mold as an application body, and a cut piece cut out of the application body in a size of 40mm × 40mm × 160mm was used as a test piece, except that the flexural strength was measured in accordance with japanese industrial standard JIS-R2575. The bending strength of each example was divided by the bending strength of comparative example 1, and the value obtained by multiplying the bending strength by 100 was used as a bending strength index. The larger the bending strength index is, the higher the strength of the structure body is. In the evaluation of the strength of the construction body, the case where the flexural strength index exceeds 110 was regarded as o (good), the case where the flexural strength index exceeds 100 and is not more than 110 was regarded as Δ (ok), and the case where the flexural strength index is not more than 100 was regarded as x (not ok).

< compactness >

The apparent porosity of the above construction article was measured in accordance with Japanese Industrial Standard JIS-R2205-1992. The apparent porosity of each example was divided by the apparent porosity of comparative example 1 and the value obtained by multiplying the value by 100 was defined as an apparent porosity index. The smaller the apparent porosity index, the higher the denseness of the worked article. In the evaluation of the denseness, the case where the apparent porosity index was 90 or less was regarded as o (good), the case where the apparent porosity index was more than 90 and less than 100 was regarded as Δ (ok), and the case where the apparent porosity index was 100 or more was regarded as x (not ok).

< resistance to slag infiltration >

In the rotary erosion test apparatus, the maximum slag penetration depth after erosion of a test piece cut out from the above construction body at 1650 ℃ for 5 hours was measured using converter slag as an erosion agent. The value obtained by dividing the maximum slag infiltration depth of each example by the maximum slag infiltration depth of comparative example 1 by 100 times was used as the slag infiltration depth index. The smaller the slag infiltration depth index is, the higher the slag infiltration resistance is. In the evaluation of the slag infiltration resistance, the case where the slag infiltration depth index was 90 or less was regarded as o (good), the case where the slag infiltration depth index was more than 90 and less than 100 was regarded as Δ (ok), and the case where the slag infiltration depth index was 100 or more was regarded as x (not ok).

< comprehensive evaluation >

In each of the above evaluations, the case of all o was regarded as o (good), the case of no x and Δ in any one of the items was regarded as Δ (ok), and the case of any one of the items being x was regarded as x (not ok).

TABLE 1

TABLE 2

Examples 1 to 11 are hot-fill materials within the scope of the present invention. The overall evaluation was all ≈ (good) or Δ (ok), thereby obtaining good results.

Comparative example 1 is an example in which the content of the alkaline material having a particle size of 20 μm or more and less than 106 μm is small. The cured article was not sufficiently cured, and all of the evaluations were x (impossible).

Comparative example 2 is an example in which the content of the alkaline material having a particle size of 20 μm or more and less than 106 μm is large. The filling property was evaluated as x (not possible).

Comparative example 3 is an example in which the content of the alkaline material having a particle size of 1mm or more is small. The strength of the construction body was evaluated as X (not acceptable).

Comparative example 4 is an example in which the content of the alkaline material having a particle size of 1mm or more is large. The increase of the gaps in the construction body leads to the decrease of compactness, and simultaneously, the strength and the slag infiltration resistance of the construction body are decreased. Further, since the content of such a coarse alkaline material having a particle size of 1mm or more is large, the filling property into the gap is also lowered.

Comparative example 5 is an example in which the content of the alkaline raw material having a particle size of less than 20 μm is large. The filling property was evaluated as x (not possible).

Claims

1. A hot-fill material comprising a refractory raw material and, added thereto, 100% by mass of a binder and water,

the content of the alkaline material having a particle diameter of less than 20 [ mu ] m is 30 mass% or less and 0 is contained in 100 mass% of the refractory material.

2. Hot fill material according to claim 1,

contains 30 to 50 mass% of a basic material having a particle diameter of 1mm or more and 10 to 20 mass% of a basic material having a particle diameter of 20 μm or more and less than 106 μm in a proportion of 100 mass% of the refractory material,

the content of the alkaline material having a particle diameter of less than 20 [ mu ] m is 20 mass% or less and 0 is contained in 100 mass% of the refractory material.

3. The hot-fill material as claimed in claim 1 or 2, wherein SiO is present in an amount of 100 mass% of the refractory raw material₂And Fe₂O₃The total amount of (B) is 3.2-7% by mass,and Fe₂O₃The content of (b) is 1.5% by mass or less and contains 0.

4. The hot-fill material as claimed in claim 1 or 2, wherein SiO is present in an amount of 100 mass% of the refractory raw material₂And Fe₂O₃The total amount of (B) is 3.2-5.5 mass%, and Fe₂O₃The content of (b) is 1.5% by mass or less and contains 0.

5. Hot fill material according to claim 1 or 2, wherein the binder comprises at least 1 selected from phosphates and silicates.

6. The hot fill material of claim 3, wherein the binder comprises at least 1 selected from the group consisting of phosphates and silicates.

7. The hot fill material of claim 4, wherein the binder comprises at least 1 selected from the group consisting of phosphates and silicates.