JP2002068769A - Method of producing inorganic particle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of easily producing an inorganic particle in a high yield. SOLUTION: In this method of producing the inorganic particle, CaO and Al2O3 materials are fed to a melting apparatus and are heated and melted, thereafter the melted product is blown away to produce both spherical and fibrous inorganic particles. It is preferable that CaO and Al2O3 materials are fed to the melting apparatus in 30-60 wt.% of CaO and 70-40 wt.% of Al2O3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic particle capable of increasing the product yield by simultaneously producing a spherical and fibrous inorganic particle by blowing away a melt having a specific chemical component. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, spherical inorganic particles and fibrous inorganic particles have been used for various purposes. For example, spherical inorganic particles are used as a fine aggregate for mortar / concrete or a filler for resin in order to improve the fluidity of mortar / concrete or resin. The fibrous inorganic particles are used, for example, as a reinforcing material for mortar and concrete.

[0003] As a method of producing spherical inorganic particles, for example, Japanese Patent Application Laid-Open No. 8-157246 discloses a ceramic-based fine bone for concrete made of an approximately spherical electric furnace oxidized slag having fine irregularities on its surface. A material is disclosed. The ceramic fine aggregate for concrete is poured into an electric furnace oxidized slag melt into a high-speed rotating bladed drum, and the melt is crushed and granulated by the bladed drum, and the granulated melt is subjected to water mist atmosphere. And obtained by quenching. It is disclosed that the ceramic fine aggregate having a particle diameter of 2.5 mm or less is substantially spherical. On the other hand, fibrous inorganic particles are generally produced by taking out a melt of a raw material as a fine stream and fibrillating it by spinning.

[0004]

SUMMARY OF THE INVENTION The above-mentioned JP-A-8-157246 is disclosed.
In the ceramic fine aggregate for concrete disclosed in Japanese Unexamined Patent Publication, a substantially spherical inorganic particle having a particle size of 2.5 mm or less can be obtained, but a bladed drum that rotates a melt of an electric furnace oxidized slag at a high speed. , And the melt must be crushed and granulated, and its production is troublesome. On the other hand, it is known that, in the production of fibrous inorganic particles by the above spinning, particles called shots (particles that are not fibrillated) are involved in addition to the fibrous inorganic particles. Such shots range from nearly spherical to mangled, and generally have unstable shapes and are difficult to collect as shots. Therefore, in the production of fibrous inorganic particles, there is a problem that the product yield is low (about 70 to 80%).

The present invention has been made in view of the above problems, and has as its object to provide a method for producing inorganic particles which is easy and can increase the product yield. .

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a molten material having a specific chemical component has been blown off to produce spherical and fibrous inorganic particles at the same time. By doing so, the inventors have found that the above-mentioned problems are solved, and have completed the present invention.

That is, the present invention provides a method for simultaneously producing spherical and fibrous inorganic particles by charging a CaO raw material and an Al ₂ O ₃ raw material into a melting device, heating and melting the molten material, and then blowing the molten material. A method for producing a characteristic inorganic particle (claim 1). And the CaO raw material and the Al ₂ O ₃ raw material are _{two of} CaO and Al ₂ O ₃ .
It is preferable that the CaO content is 30-60 wt% and the Al ₂ O ₃ content is 70-40 wt% in terms of the components in the melting device (claim 2).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The method for producing inorganic particles of the present invention comprises: a CaO raw material and Al ₂ O ₃
The present invention is characterized in that spherical and fibrous inorganic particles are simultaneously produced by introducing a raw material into a melting device, heating and melting the melt, and then blowing the melt away. In the present invention, since the inorganic particles are produced by blowing away the melt,
Easy to manufacture. In addition, since a melt having a specific chemical component (mainly composed of a CaO component and an Al ₂ O ₃ component) is used, spherical and fibrous inorganic particles can be produced at the same time. Since the granular inorganic particles are simultaneously produced, the product yield can be increased (90% or more).

The method for producing inorganic particles of the present invention will be specifically described. In the present invention, first, a CaO raw material and an Al ₂ O ₃ raw material are charged into a melting device and melted. In the present invention
The CaO feed, quicklime, hydrated lime, industrial raw materials limestone, etc., as the Al ₂ O ₃ raw material, bauxite, bands shale, aluminum hydroxide, industrial materials such as alumina. The raw materials may be mixed before being charged into the melting device, or may be individually charged into the melting device. The raw material may be in the form of powder,
Alternatively, a lump may be used. The melting apparatus used in the present invention is not particularly limited, and examples thereof include a kiln, an electric furnace, a reverberatory furnace, and a cupola.

[0010] The mixing ratio of the CaO raw material and the Al ₂ O ₃ raw material depends on the melting temperature and the viscosity of the melt when producing inorganic particles.
And the amount of CaO is 30 to 60 wt% bicomponent Conversion _{Al 2 O 3, Al 2 O} 3 amount is preferably 70 to 40 wt%. Outside of the above range, the melting temperature becomes high and it becomes difficult to melt, or the viscosity of the melt becomes large and it becomes difficult to blow off the melt, which is not preferable. The above-mentioned industrial raw materials contain impurities such as SiO ₂ , Fe ₂ O ₃ , TiO ₂ , and MgO. The inorganic particles produced in the present invention may contain these impurities in a total amount of 10% by weight or less.

Next, the melt is cooled by blowing it off to produce spherical and fibrous inorganic particles at the same time.
The blow-off of the melt may be performed, for example, by using a device generally used in a blowing process, such as by blowing with high-pressure air. In the present invention, the ratio of the spherical inorganic particles and the fibrous inorganic particles can be changed by changing the pressure or the like at the time of blowing off the melt. For example, if the pressure at which the melt is blown off is increased, the proportion of the fibrous inorganic particles can be increased.

In the inorganic particles produced by the present invention, spherical inorganic particles are used, for example, for fine aggregate for mortar and concrete, resin filler, etc., and fibrous inorganic particles are used, for example. Used for applications such as reinforcement for mortar and concrete.

The spherical inorganic particles referred to in the present invention are:
A rounded grain without a corner. Specifically, for example, when the granules are projected and measured for the granule contour, the sum of the curvature radii r of the contours of each granule is divided by the product of the maximum inscribed radius R of the granule and any number. Value (degree of roundness)
Is preferably 0.5 or more. At this time, the radius of curvature r of the contour of each particle is larger than 0 and r> R with respect to the maximum inscribed radius R of the particle. In addition, the fibrous inorganic particles referred to in the present invention refer to particles having a diameter of 3 mm or less and an aspect ratio of 2.0 or more. The shape of the inorganic particles may be measured using, for example, an image analyzer. The spherical and fibrous inorganic particles produced in the present invention may be either crystalline or amorphous.

[0014]

Test Examples Hereinafter, the present invention will be described with reference to test examples. CaO
Quicklime as a source, Al edition using soil shale as ₂ O ₃ source, CaO amount in two components in terms of chemical composition CaO and Al ₂ O ₃ is from 34 to 5
After mixing so that the amount of Al ₂ O ₃ becomes 0 to 50% by weight, the mixture was put into a melting apparatus (electric furnace) and melted at 1600 ° C.
The melt is blown off with high-pressure air by a blower,
Spherical granules of 1 to 2 mm (roundness: 0.8 to 1.0) and diameters of 0.001 to 2 mm
At the same time, fibrous particles having an aspect ratio of 2.5 or more were produced (the ratio of spherical particles to fibrous particles (weight ratio) was 50:50). The product yield was about 96%.

[0015]

As described in detail above, in the method for producing inorganic particles according to the present invention, the CaO raw material and the Al ₂ O ₃ raw material are charged into a melting device, heated and melted, and then the melt is blown off. Thus, the production of the inorganic particles is easy. In addition, since a melt having a specific chemical component (mainly a CaO component and an Al ₂ O ₃ component) is used, spherical and fibrous inorganic particles can be simultaneously produced, and spherical and fibrous inorganic particles can be produced. High production yield (90%)
Above).

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Claims (2)

[Claims] 1. An inorganic material, wherein a CaO raw material and an Al ₂ O ₃ raw material are put into a melting device, heated and melted, and then the melt is blown off to produce spherical and fibrous inorganic particles at the same time. Manufacturing method of granules. 2. The CaO raw material and the Al ₂ O ₃ raw material are mixed with CaO and Al ₂ O ₃ .
In component terms, CaO amount is 30 to 60 wt%, the production method of the inorganic particles of claim 1 in which the amount of Al ₂ O ₃ is charged into the melting apparatus so that 70 to 40 wt%.