JPH0251443A - Rock wool - Google Patents

Abstract

PURPOSE:To industrially produce rock wool capable of being melted and formed into a fiber and having superior heat resistance, compressive strength and restorability after compression at a low cost by using olivine, steel slag and a silica component regulating agent as principal components. CONSTITUTION:Rock wool is composed of, by weight, 5-30% olivine, 55-90% molten or solid steel slag and 5-15% silica component regulating agent such as silica, pottery stone or pagodite so as to obtain a compsn. consisting of 35-45% SiO2, 5-15% Al2O3, 20-35% CaO, 5-20% MgO, 0-5% FeO and <=5%, in total, of inevitable components (TiO2, MnO, Na2O, K2O and S). The rock wool is used as a ceiling material, a fireproof heat insulating material, a substitute for asbestos, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has high compressive strength and compressive recovery properties, and more specifically, it is suitable for use in V&O rock, steel slag, and high silica content as a silica component regulator. This invention relates to rock wool that is made from natural stone, has a fiberization temperature similar to that of ordinary slag-based rock wool, has flexible fibers, and is lightweight and has excellent compressive strength and compressive recovery properties.

This rock wool has made it possible to expand existing applications and develop new applications, such as mineral fiber boards (ceiling panels), fireproofing, heat retention, and insulation materials, and asbestos substitutes.

[Conventional technology] Conventionally, slag-based rock wool using steel slag,
Natural stones such as silica stone are added to steel slag as a composition adjusting agent, and melted in a cupola or electric furnace.The molten material is then blown by a high-speed rotary body using centrifugal force or compressed air, and further by centrifugal force and compressed air. RAM is manufactured using a method that uses blowing. Such slag wool-based rock wool has higher heat resistance than glass wool, but lower than ceramic wool. It also has lower compressive strength and compressive recovery than glass wool, is less flexible than glass wool and ceramic wool, and has a higher heat resistance than inorganic fibers. It has performance problems that are common to all types, such as the tendency to be easily eroded by water.

Reflecting the performance of slag wool-based rock wool and the advantage that it can be manufactured at low cost, a nonflammable sound-absorbing mineral material I is currently being developed.
IH board (ceiling board), mainly medium to high temperature (approximately 500 to 6
Although it is used in large quantities as an industrial heat insulating material and a fireproof coating material (00°C), the current situation is that it has not been possible to expand its use in conventional product fields or develop new uses.

[Problems to be Solved by the Invention] The present invention uses the same melting equipment (cupola type or electric furnace) as the conventional slag-based rock wool, and the same fiberization method, that is, using centrifugal force or compressed air, and furthermore, by using the sound of rain. The purpose was to obtain rock wool that can be made into fibers, can be manufactured using inexpensive raw materials, and has excellent compression strength and compression recovery properties.

As a result of various studies, the inventors of the present invention found that 5 to 30% by weight of scraped rock and 55 to 90% of steel slag in a molten or solid state.
5 to 15% by weight of a silica component regulator, Si0 35 to 45% by weight, Al2O 35 to 15% by weight, CaO 20 to 35% by weight, Mao 5 to 20% by weight, FeO 0 to 5% by weight. is the main component, with TiO2 and Mn01 as inevitable components.
Rock wool with a maximum total of 5% by weight of NaO, K2O and S can be manufactured in conventional cupolas as well as electric furnaces, and has excellent compressive strength and compressive recovery properties.
This has made it possible to expand the uses of conventional slag-based rock wool products (mineral ceiling panels, insulation materials, fireproof coatings) and to develop new uses such as asbestos substitutes.

[Means for Solving the Problems] As a method for improving the compressive strength and compressive recovery properties, which are the objects of the present invention, S i 02 and Mac.

Addition of FeO is effective. However, simply S i O
When 2 is increased, the softening temperature is lowered, and melting starts at a lower temperature. Particularly in cupolas, upper melting occurs and the pressure inside the furnace increases, making operation difficult. Therefore, as with the first objective, it is necessary to reduce the viscosity, but
Alkali metal and metal oxides do not contribute to improving fiber strength, and among alkaline earth metal oxides, CaO is not preferred because it makes the obtained fiber brittle and easily deteriorates. Therefore, MGO is suitable as a component that reduces viscosity and improves 1lII strength. Further, although the FeO component does not have a large effect on viscosity, it is better to include a large amount in order to improve fiber strength.

In order to add this MgO component and FeO component at low cost,
As with the first purpose, it is preferable to use excavation rocks. lol
1.1 rock exists in the Hokkaido area in huge quantities and can be obtained at low cost. In addition, at least a part of the excavated rock is made of Ma that has been metamorphosed from the excavated rock to the extent that it does not impair its meltability.
It is also possible to replace it with O-rich serpentinite.

From the above points, in order to obtain the components to achieve the purpose of the present invention at low cost, and to industrially produce 1 q of fiber using conventional slag-based rock wool equipment, it is necessary to
It is preferable to mix up to 30% by weight of steel slag, 55 to 90% by weight of steel slag, and 5 to 15% of natural stone as a silica component regulator.

Natural stones used as the silica component adjusting agent in the present invention include silica stone, china stone, and wax stone. The component range of the resulting mixture is S
Regarding iO2, it is desirable to have as much as possible in order to improve the fiber strength, but it is preferably 45% by weight or more because the viscosity increases and the melting temperature becomes high. Further, in order to obtain good quality mu, 35% by weight or more is required.

Although it is desirable to have a large amount of Al2O3 in order to improve heat resistance, it is preferably 15% by weight or less since the melting temperature is extremely high, and 5% by weight is required in order not to impair heat resistance. Since the obtained fibers are brittle and easily deteriorate, CaO is contained in an amount of 35% by weight or less, preferably 30% by weight or less, and in order to obtain the effect of reducing viscosity,
It is preferably 0% by weight or more. It is desirable to actively add MoO, which contributes to the strength and flexibility of the resulting fibers, but as the content of this component increases, the devitrification temperature rises and operability deteriorates, so it is preferably 20% or less.

Moreover, if it is less than 5% by weight, no improvement in heat resistance can be expected.

FeO contributes to improving heat resistance and 1411 strength, but too much FeO causes operational problems such as iron removal, so it is
The range of ω% is preferable. In addition, as an unavoidable component, T
Although 20 and S may be present in iO, Mn01Na20, the total amount thereof must be 5% by weight or less so as not to impair the object of the present invention.

When the raw material rock is melted in a cupola, the particle size is suitably 10 to 100 #lI, and coke fuel is added to this. In addition, when melting in an electric furnace, the size of the raw material rock particles and steel slag when using solid state steel slag is 1 to 5 m, and when using molten state steel slag, the raw material rock particles The size of is 1
~5m is suitable, and it can be melted at 1400~1600°C using carbon or molybdenum electrodes.

The rock type used in the present invention is called magnesia-rich dunnite, which has already been used industrially. In Japan, there are Akaishi mines from Ehime, Hidaka from Hokkaido,
Furthermore, it is known that it is produced in the Ishikawa region of the Fukushima region. Steel slag is slag produced especially in the steel tapping process. Commercially available silica stone is used.

Table 1 lists typical compositions of raw materials used in the present invention.

Examples of the present invention will be described below. In the example, w11g! of Table 1 is used. Rock, steel slag and silica stone were used.

Example 1 W1 right type 0% by weight with particle size 10-50s, steel slag 8
0 weight percent and 10 weight percent silica stone were mixed together, heated and melted in a cupola, and the melt was heated at the fiberization temperature shown in Table 2 using multiple internally cooled high-speed rotating bodies (one rotor with an inner diameter of 10 inches, one outer diameter rotor, and Diameter 1
The fibers were collected using three 4-inch rotors at a rotational speed of 500 rpm and a compressed air flow (about 100 TrL/sec).

Table 2 shows the results of analysis of the composition and measurement of physical properties of the rock wool obtained.

Example 2 65% by weight of molten steel slag was added with a particle size of 1 to 5 m1i
25% by weight of wIN rock and 10% by weight of silica stone were added, heated and melted in an electric furnace using a carbon electrode, and collected into tiAN. Table 2 shows the results of analysis of the composition and measurement of physical properties of the rock wool obtained.

Comparative example 1 Ordinary slag-based rock wool is shown as a comparative example.

The formulation, composition and measurement results are shown in Table 2.

Table 2 8 Kinkoku Hani〒Unavoidable components (TiO2, MnO, 20.N
a2O,S measurement method (1) Melt viscosity fiberization temperature (3) Average fiber diameter (4) Fiber strength (5) Heat-resistant temperature ^ Mixing viscosity balance (manufactured by Yoshikeiki) Two-color radiation thermometer (Chino) 100 fibers were arbitrarily taken out from the sample and an electron micrograph (magnification: 1000) was taken to show the average value.

Ten made by Toyo Baldwin Tensile fracture using Chiron Measure the load and break the value Point cross-sectional area (fiber diameter at break point Measured with an electron microscope and found the cross-sectional area ). Up This measurement was performed on approximately 100 fibers. fiber diameter - tensile Create a graph of intensity and regression According to the formula, at the average fiber diameter Calculate fiber strength (tensile strength) did.

JIS A9504 Hot load (6) Compressive strength (7) Compressive recovery rate Heavy sample density 60 kg/TrL3 sample (100 as + It was compressed to a thickness and the load was measured.

A sample with a density of 60 kg/TrL3 (1 00 s + Then, the restoration rate was calculated from the original thickness.

[Effects of the Invention] As described above in Examples 1 and 2, the rock wool of the present invention can be used not only in electric furnaces but also in conventional slag type With rock wool melting equipment (cupola furnace, etc.), S i 02, MQO
It will be understood that it is possible to melt the fibers by increasing the number of components, can be produced industrially at low cost, and has excellent performance in heat resistance, compressive strength, and compressive recovery. As a result, conventional rock wool-related products (ceiling panels, high-strength insulation, insulation materials such as heat insulation boards, such as roof insulation materials, insulation base materials for floating floor construction methods, fireproof coating materials, and fillers for brake linings, etc.) Expansion of uses and alternative products for asbestos have become possible. In addition, due to its good compression and recovery properties, transportation,
It has the advantage that it can be packed compactly and does not take up much space when stored.

Claims (2)

[Claims] (1) A mixture of 5-30% by weight of transported rock, 55-90% by weight of steel slag in a molten or solid state, and 5-15% by weight of a silica component regulator, and 35-45% by weight of SiO_2. % Al_2O_3 5-15% by weight CaO 20-35% by weight MgO 5-20% by weight FeO 0-5% by weight The main components are TiO_2 and MnO as inevitable components.
, Na_2O, K_2O and S total up to 5% by weight
Rock wool characterized by up to. (2) The rock wool according to claim 1, wherein the silica component regulator is selected from natural stones such as silica stone, china stone, and wax stone.