Hot filler
Technical field
[0001]
　The present invention relates to a hot filler.
Background technology
[0002]
　One usage form of the hot filler will be described by taking as an example the replacement work of the converter outlet sleeve. As shown in FIG. 1A, first, the converter 1 that has finished steel removal is tilted around the trunnion 2 so that the steel output port 3 approaches the work floor 4. The operator disassembles the old sleeve 6 by the breaker 5 and removes it from the steel outlet 3.
　As shown in FIG. 1 (B), next, the converter 1 is tilted so that the steel outlet 3 faces downward with the trunnion 2 as the axis, and the new sleeve 7 is fitted into the steel outlet 3. Next, using the discharge device 9, the hot filler 8 is discharged into the gap between the new sleeve 7 and the main body of the converter 1 (hereinafter referred to as “construction target location”), and the construction target location is hot-filled. Fill with material 8.
[0003]
　The hot filler 8 is formed by adding a binder and water to a fireproof raw material containing a basic raw material. In the example of FIG. 1B, water is added in the discharge pipe 10 of the discharge device 9. The temperature of the construction target portion is, for example, about 600 to 1000 ° C., and the hot filler 8 boils immediately after filling. Due to this boiling force, the hot filler 8 is agitated in the construction target location and is densely filled in the construction target location. After the boiling has subsided, the hot filler 8 is cured by the binding action of the binder (see, for example, Patent Document 1).
[0004]
　Such a hot filler is required to have a filling property in a gap as described above as a basic property, but the filling property has not been sufficient in the past.
Prior art literature
Patent documents
[0005]
Patent Document 1: Japanese Patent No. 4960906
Outline of the invention
Problems to be solved by the invention
[0006]
　An object to be solved by the present invention is to improve the filling property of the hot filler.
Means to solve problems
[0007]
　Since the hot filler is filled in the gap, if it is cured before it is filled in the gap, the filling property deteriorates (the filling property in the gap cannot be ensured). Therefore, as a result of repeated experiments and studies focusing on the particle size composition of the basic raw material constituting the hot filler, the present inventors have found that an appropriate amount of the basic raw material having a particle size of 20 μm or more and less than 106 μm is contained in the hot filling material. It was found that the material is easily filled in the gap and hardens after being filled in the gap.
[0008]
　That is, according to one aspect of the present invention, the following hot filler is provided.
　A hot filler made by adding a binder and water to 100% by mass of a fire-resistant raw
　material, and 25% by mass or more of a basic raw material having a particle size of 1 mm or more as a percentage of the 100% by mass of the fire-resistant raw material. It contains 5% by mass or more and 25% by mass or less of a basic raw material having a particle size of 20 μm or more and less than 106 μm
　, and the content of the basic raw material having a particle size of less than 20 μm is 30 in the proportion of 100% by mass of the fireproof raw material. A hot filler having a mass% or less (including 0).
[0009]
　The particle size referred to in the present invention is the size of the sieve mesh when the fireproof raw material particles are sieved and separated. For example, a basic raw material having a particle size of less than 20 μm has a sieve mesh of 20 μm. A basic raw material having a particle size of 20 μm or more is a basic raw material having a sieve mesh of 20 μm that does not pass through the sieve.
Effect of the invention
[0010]
　According to the present invention, the filling property of the hot filler can be improved.
A brief description of the drawing
[0011]
FIG. 1 is a diagram showing a usage pattern of a hot filler.
[Fig. 2] The figure which shows the brick set used for the evaluation of the filling property.
Mode for carrying out the invention
[0012]
　The hot filler of the present invention contains 5% by mass or more and 25% by mass or less of a basic raw material having a particle size of 20 μm or more and less than 106 μm in a proportion of 100% by mass of the fireproof raw material. The basic raw material elutes Mg 2+ ions and Ca 2+ ions, and the eluted Mg 2+ ions and Ca 2+ ions react with binders and the like to contribute to the hardening of the work piece. Since the specific surface area of ​​the sex raw material is appropriate, Mg 2+ ions and Ca 2+ ions are eluted at an appropriate elution rate. Therefore, by containing an appropriate amount of the basic raw material having a particle size of 20 μm or more and less than 106 μm, the construction body can be cured at an appropriate timing. Further, by containing an appropriate amount of the basic raw material having a particle size of 20 μm or more and less than 106 μm, the fluidity of the hot filler is improved and it becomes easy to fill the gap. That is, a hot filler containing 5% by mass or more and 25% by mass or less of a basic raw material having a particle size of 20 μm or more and less than 106 μm is easily filled in the gap, and is cured after being filled in the gap. Is improved.
　If the content of the basic raw material having a particle size of 20 μm or more and less than 106 μm is less than 5% by mass, the work piece does not harden or it takes a long time to harden the work piece, which hinders the actual operation. On the other hand, when the content of the basic raw material having a particle size of 20 μm or more and less than 106 μm is more than 25% by mass, the gap is once filled, but the work piece shrinks due to heat reception and a gap is generated again.
　The content of the basic raw material having a particle size of 20 μm or more and less than 106 μm is preferably 10% by mass or more and 20% by mass or less.
[0013]
　The hot filler of the present invention contains 25% by mass or more and 60% by mass or less of a basic raw material having a particle size of 1 mm or more in a proportion of 100% by mass of the fireproof raw material. When the content of the basic raw material having a particle size of 1 mm or more is less than 25% by mass, the balance of the particle size composition of the fireproof raw material becomes poor and the strength of the construction body decreases. On the other hand, when the content of the basic raw material having a particle size of 1 mm or more is more than 60% by mass, the number of voids in the construction body increases, and the strength of the construction body also decreases.
　The content of the basic raw material having a particle size of 1 mm or more is preferably 30% by mass or more and 50% by mass or less.
[0014]
　The content of the basic raw material having a particle size of less than 20 μm in the hot filler of the present invention is 30% by mass or less (including 0). When the content of the basic raw material having a particle size of less than 20 μm is more than 30% by mass, Mg 2+ ions and Ca 2+ ions are eluted too quickly and harden before being filled in the gaps, so that they cannot be filled uniformly. The content of the basic raw material having a particle size of less than 20 μm is preferably 20% by mass or less (including 0).
[0015]
　The hot filler of the present invention may or may not contain a basic raw material having a particle size of 106 μm or more and less than 1 mm.
[0016]
　As the basic raw material, a basic raw material generally used for hot fillers can be used, and examples thereof include magnesia, dolomite, olivine, brucite, calcium carbonate, and magnesia-carbon type. .. Further, the hot filler of the present invention may contain alumina, spinel, silicon carbide, alumina-silica, etc. as a fireproof raw material other than the basic raw material.
[0017]
　The hot filler of the present invention has a total amount of SiO 2 and Fe 2 O 3 of 3.2% by mass or more and 7% by mass or less and Fe 2 O 3 in a proportion of 100% by mass of the fireproof raw material . The content is preferably 1.5% by mass or less (including 0). SiO 2 and Fe 2 O 3 form a compound with MgO and CaO in the basic raw material, and have an effect of suppressing elution of Mg 2+ ions and Ca 2+ ions. Therefore, it is possible to prevent the construction body from being cured at an early stage and becoming highly viscous to reduce the filling property. However, when the total amount of SiO 2 and Fe 2 O 3 is less than 3.2% by mass, Mg 2+ ions can be prevented. , The effect of suppressing the elution of Ca 2+ ions is not sufficiently exhibited. On the other hand, SiO 2 and Fe 2 O When the total amount of 3 exceeds 7% by mass, Mg 2+ ions and Ca 2+ ions fall below an appropriate elution rate, making it difficult to cure. The total amount of SiO 2 and Fe 2 O 3 is more preferably 3.2% by mass or more and 5.5% by mass or less.
　Further, if the content of Fe 2 O 3 exceeds 1.5% by mass, a low melting point compound may be produced and the corrosion resistance may be lowered. Therefore, the content of Fe 2 O 3 is 1.5% by mass or less (0). ) Is preferable.
　Here, the content of Fe 2 O 3 is assumed to be converted to oxide (Fe 2 O 3 ) by detecting the amount of Fe in the sample by fluorescent X-ray analysis . Similarly, the content of SiO 2 is assumed to be converted to oxide (SiO 2 ) by detecting the amount of Si in the sample by fluorescent X-ray analysis .
[0018]
　The hot filler of the present invention is obtained by adding a binder and water to 100% by mass of the fireproof raw material as described above.
　As the binder, those generally used for hot fillers can be used, and examples thereof include phosphates, silicates, pitches, powder resins, alumina cements, etc., but phosphorus is typically used. Use one containing at least one selected from phosphates and silicates. Examples of the phosphate include sodium phosphate, potassium phosphate, lithium phosphate, calcium phosphate, magnesium phosphate, aluminum phosphate and the like, and silicates include sodium silicate, potassium silicate and calcium silicate. Further, the amount of the binder added may be the same as that of a general hot filler, and is, for example, 1% by mass or more and 10% by mass or less in the outer cover with respect to 100% by mass of the fireproof raw material.
　An additive may be used as the binder. As the additive, various additives such as a curing agent, a dispersant, and a thickener can be used. For example, slaked lime can be used as the curing agent, phosphate can be used as the dispersant, and clay can be used as the thickener.
[0019]
　The amount of water added may be the same as that of a general hot filler. For example, the amount of water added is 30% by mass or more and 60% by mass or less with respect to 100% by mass of the fireproof raw material.
[0020]
　The hot filler of the present invention as described above may be discharged with air using the discharge device 9 as shown in FIG. 1 (B), or may be poured without using the discharge device 9. It may be put in a container to be burnt down.
Example
[0021]
　Tables 1 and 2 show the fire-resistant raw material configurations and evaluation results of Examples and Comparative Examples of the present invention. In Tables 1 and 2, magnesia was used as the "basic raw material" except in Example 8, and in Example 8, magnesia and dolomite were used in combination. The evaluation items and evaluation methods are as follows.
[0022]
As
　shown in FIG. 2, bricks are set in the hot fillers of each example obtained by adding an appropriate amount of binder (sodium phosphate) and water to the fireproof raw materials of each example shown in Tables 1 and 2. This brick set 11 was heated to 1000 ° C. and then poured into a quadrangular pyramid-shaped gap 12 of 15 mm square × 230 mm formed in 11 (combination of 4 magnesia-carbon bricks 11a). After cooling, the brick set 11 was cut, and the filling property (the size of the unfilled gap) into the gap 12 was confirmed. In the evaluation of fillability, ○ (good) when there is no unfilled gap or the size of the unfilled gap is less than 1 mm, and △ (possible) when the size of the unfilled gap is 1 mm or more and less than 2 mm. The case where the size of the unfilled gap is 2 mm or more is marked with x (impossible).
[0023]

　A mold obtained by adding an appropriate amount of binder (sodium phosphate) and water to the fire-resistant raw materials of each example shown in Tables 1 and 2 and heating the hot filler of each example to 1000 ° C. After pouring into the inside, boiling and curing, and then cooling to room temperature, it is taken out from the mold as a work piece, and a piece cut out from this work piece to a size of 40 mm × 40 mm × 160 mm is used as a test piece. The bending strength was measured according to. The value obtained by dividing the bending strength of each example by the bending strength of Comparative Example 1 and multiplying by 100 was used as the bending strength index. The larger the bending strength index, the higher the strength of the construction body. In the evaluation of the strength of the construction body, the case where the flexural strength index was more than 110 was evaluated as ◯ (good), the case where the bending strength index was more than 100 and 110 or less was evaluated as Δ (possible), and the case where the bending strength index was 100 or less was evaluated as × (impossible).
[0024]
<
　Denseness > The apparent porosity of the above-mentioned construction body was measured in accordance with JIS-R2205-1992. The apparent porosity of each example was divided by the apparent porosity of Comparative Example 1 and multiplied by 100 to obtain the apparent porosity index. The smaller the apparent porosity index, the higher the precision of the construction body. In the evaluation of the denseness, the case where the apparent porosity index was 90 or less was evaluated as ◯ (good), the case where it was more than 90 and less than 100 was evaluated as Δ (possible), and the case where it was 100 or more was evaluated as × (impossible).
[0025]
In a
　rotary erosion test device, a converter slag is used as an erosion agent, and the maximum slag infiltration depth when a test piece cut out from the above-mentioned construction body is eroded at 1650 ° C. for 5 hours is measured. did. The value obtained by dividing the maximum slag infiltration depth of each example by the maximum slag infiltration depth of Comparative Example 1 and multiplying by 100 was used as the slag infiltration depth index. The smaller the slag infiltration depth index, the higher the slag infiltration resistance. In the evaluation of slag infiltration resistance, the case where the slag infiltration depth index was 90 or less was evaluated as ◯ (good), the case where the slag infiltration depth index was more than 90 and less than 100 was evaluated as Δ (possible), and the case where the slag infiltration depth index was 100 or more was evaluated as × (impossible).
[0026]
In
　each of the above evaluations, if all are ○, then ○ (good), if there is no × and there is △, then △ (possible), and if any one is ×, then × (impossible). did.
[0029]
　Examples 1 to 11 are hot fillers within the scope of the present invention. In each case, the overall evaluation was ○ (good) or △ (possible), and good results were obtained.
[0030]
　Comparative Example 1 is an example in which the content of the basic raw material having a particle size of 20 μm or more and less than 106 μm is small. The construction body could not be sufficiently cured, and all the evaluations were x (impossible).
　Comparative Example 2 is an example in which the content of the basic raw material having a particle size of 20 μm or more and less than 106 μm is large. The evaluation of filling property was x (impossible).
[0031]
　Comparative Example 3 is an example in which the content of the basic raw material having a particle size of 1 mm or more is small. The evaluation of the strength of the construction body was x (impossible).
　Comparative Example 4 is an example in which the content of a basic raw material having a particle size of 1 mm or more is large. The number of voids in the construction body increased, the denseness decreased, and the strength and slag infiltration resistance of the construction body decreased. In addition, since the content of the coarse-grained basic raw material having a particle size of 1 mm or more is large, the filling property into the gap is also lowered.
[0032]
　Comparative Example 5 is an example in which the content of the basic raw material having a particle size of less than 20 μm is large. The evaluation of filling property was x (impossible).
Code description
[0033]
　1 converter
　2 trunnion
　3 steel outlet
　4 work floor
　5 breaker
　6 old sleeve
　7 new sleeve
　8 hot filler
　9 discharge device
　10 discharge pipe
　11 brick set
　11a magnesia-carbon brick
　12 gap
The scope of the claims
[Claim 1]
　A hot filler made by adding a binder and water to 100% by mass of a fire-resistant raw
　material, and 25% by mass or more of a basic raw material having a particle size of 1 mm or more as a percentage of the 100% by mass of the fire-resistant raw material. It contains 5% by mass or more and 25% by mass or less of a basic raw material having a particle size of 20 μm or more and less than 106 μm
　, and the content of the basic raw material having a particle size of less than 20 μm is 30 in the proportion of 100% by mass of the fireproof raw material. A hot filler having a mass% or less (including 0).
[Claim 2]
　30% by mass or more and 50% by mass or less of a basic raw material having a particle size of 1 mm or more and 10% by mass or more and 20% by mass or less of a basic raw material having a particle size of 20 μm or more and less than 106 μm are contained in 100% by mass of the fireproof raw material.
　The hot filler according to claim 1 , wherein the content of the basic raw material having a particle size of less than 20 μm is 20% by mass or less (including 0) in the proportion of 100% by mass of the fireproof raw material.
[Claim 3]
　The total amount of SiO 2 and Fe 2 O 3 is 3.2% by mass or more and 7% by mass or less, and the content of Fe 2 O 3 is 1.5% by mass in proportion to 100% by mass of the fireproof raw material. The hot filler according to claim 1 or 2, which is as follows (including 0).
[Claim 4]
　The total amount of SiO 2 and Fe 2 O 3 is 3.2% by mass or more and 5.5% by mass or less, and the content of Fe 2 O 3 is 1.5 in proportion to 100% by mass of the fireproof raw material. The hot filler according to claim 1 or 2, wherein the content is mass% or less (including 0).
[Claim 5]
　The hot filler according to any one of claims 1 to 4, wherein the binder contains at least one selected from phosphates and silicates.