WO2008129705A1

WO2008129705A1 - Asbestos-free high-purity natural flaky mineral and process for production thereof

Info

Publication number: WO2008129705A1
Application number: PCT/JP2007/070678
Authority: WO
Inventors: Yohiko Mito; Takatsugu Ushirouchi
Original assignee: Showa Kde Co., Ltd.
Priority date: 2007-04-04
Filing date: 2007-10-17
Publication date: 2008-10-30
Also published as: CN101687654B; JP2008254960A; CN101687654A; JP5588589B2

Abstract

The invention provides an asbestos-free high-purity natural flaky mineral obtained by ridding a natural flaky mineral raw ore of non-flaky mineral components and asbestos contained therein as impurities; and a process for producing easily an asbestos-free high-purity natural flaky mineral. The invention relates to an asbestos-free high-purity natural flaky mineral produced by a process which comprises coarsely crushing an asbestos-containing natural flaky mineral raw ore to prepare the first mixture comprising flakes consisting of a flaky mineral alone, lumps consisting of asbestos-containing non-flaky minerals and/or lumps consisting of a flaky mineral, and powdery asbestos; screening the first mixture to prepare the second mixture having a classifiable particle size range; and separating the second mixture with a specific gravity difference separation apparatus into flakes consisting of a flaky mineral alone, lumps consisting of asbestos-containing non-flaky minerals and/or lumps consisting of a flaky mineral, and powdery asbestos.

Description

Description Asbestos One high-purity natural scale-like mineral and its production method Technical Field

The present invention relates to an asbestos-free high-purity natural scaly mineral and a method for producing the same. More specifically, the present invention relates to a mineral component other than a scaly mineral mixed as an impurity from a natural scaly mineral ore and It is an aspect-free, high-purity natural scaly mineral obtained by separating Aspes-Koji and its production method. Background art

Wind separation is widely used to separate mineral components other than flake minerals from natural flake mineral ore, but the classification accuracy is poor and the specific gravity difference is very small. It was difficult to separate the powdered components, and there was a limit to the separation.

On the other hand, the wet separation method, which sorts by floating or non-floating in the liquid, or the difference in the settling speed, is suitable for sorting low-density materials such as mixed wood chips and powder. It is difficult to separate, for example, granular or massive mineral components other than flaky minerals and flaky minerals. In addition to the limitations of separation, it is necessary to dry after sorting and is complicated and costly. There was a problem to become.

Conventionally, a shredder dust separation method and device that separates and recycles copper shredder dust using an air table (refer to Patent Document 1), waste by specific gravity difference using an air table Specific gravity difference sorting device (patent document) 2), specific gravity separation device that separates useful materials such as copper wire from industrial waste containing foreign materials such as glass, plastic, and carbon (see Patent Document 3)

Patent Document 1: Japanese Patent Laid-Open No. 1 1 3 4 7 5 2 9

Patent Document 2: Japanese Patent Laid-Open No. 2 0 0 2 — 1 3 6 9 4 2

Mouth

Patent Document 3: Japanese Patent Application Laid-Open No. 10- 3 1 4 6 7 5

Disclosure of the invention

Problems to be solved by the invention

Among scale-like minerals, vermiculites widely used as industrial materials, building materials, agricultural and horticultural materials, etc. are highly likely to contain a very small amount of dust, and the Ministry of Health, Labor and Welfare was formulated. 0 8 2 8 0 0 No. 1 “Asbestos content analysis method in natural minerals” is required to be thoroughly managed.

,

Only the Parabola mine in South Africa is a force that uses the method of drilling only the area where there is no possibility of contamination by Aspes 卜 by using this method ^ This method is used for small mines such as China However, it is currently imported into Japan with a small amount of asbestos mixed.

The first object of the present invention is to separate mineral components and asbestos other than flaky minerals mixed as impurities from natural flaky mineral ore used as industrial raw materials in natural ores. Providing asbestos-free and high-purity natural scaly minerals,

The second object of the present invention is to provide a process for easily producing an asbestos-free high-purity natural scaly mineral. Means for solving the problem

The first invention of the present invention for solving the above-mentioned problem is that the mineral component and asbestos other than the flaky mineral obtained by separating from the natural flaky mineral ore containing asbestos as an impurity are substantially present. It is an asbestos-free high-purity natural scale-like mineral characterized by not being contained in.

According to a second aspect of the present invention, in the asbestos-free high-purity natural scale-like mineral according to the first aspect of the present invention, the scale-like mineral is vermiculite and Z or mica. According to a third aspect of the present invention, a natural scale-like mineral ore containing asbestos is coarsely pulverized to obtain a scale-like product composed only of the scale-like mineral, and a mineral other than the scale-like mineral containing the best. After preparing a first mixture containing a lump comprising a lump and a lump or flake mineral, and a powdery powder, it is adjusted to a particle size range that can be classified by a sieve. A second mixture is prepared, and the second mixture is separated from the scaly matter composed only of scaly minerals using a specific gravity difference separator, and the agglomerates composed of minerals other than the scaly minerals including the dust and / or Alternatively, it is a method for producing an asbestos-free high-purity natural scale-like mineral, characterized by separating into a lump of scale-like mineral and powdery asbestos.

According to a fourth aspect of the present invention, in the third production method of the present invention, the specific gravity difference separation device is an air table. According to a fifth aspect of the present invention, in the fourth production method of the present invention, the air permeable sheet-like vibrating body in which wind is allowed to flow upward from below the air permeable sheet-like vibrating body provided at an inclination. The second mixture is supplied onto the inclined surface of the glass, and the scale-like material is lifted by the buoyancy of the wind. The mass is moved downward and separated by the action of gravity, and the lump is not lifted by the buoyancy caused by the wind, and is moved upward and separated by the action of the vibration. And collecting the mineral component including the best powder that is separated from the mi mixture and transferred upward by the wind circulated upward from below the air-permeable sheet-like vibrator. Special feature.

A sixth invention of the present invention is characterized in that in the production method according to any one of the third to fifth inventions, the separated flakes are further washed with water. The invention's effect

The first aspect-free high-purity natural scaly mineral of the present invention substantially contains mineral components and asbestos other than scaly minerals obtained by separating from natural scaly minerals containing asbestos as impurities. It is characterized by not being,

Since it is substantially free of mineral components and asbestos other than scaly minerals, it is highly safe and has high purity, so that the yield can be improved, and there is a remarkable effect that it can be applied safely to various applications.

A second invention of the present invention is characterized in that, in the first asbestos-free high-purity natural scale-like mineral of the present invention, the scale-like mineral is vermiculite and / or mica, and does not include a best. Because it contains virtually no mineral components other than vermiculite or mica, it is highly safe and has good purity, so it can improve yield, and can be used as a high-purity vermiculite or high-purity mica. It has the remarkable effect that it can be applied with care. According to a third aspect of the present invention, a natural scaly mineral ore containing asbestos is coarsely pulverized to obtain a scaly product composed only of scaly minerals and a mineral other than a scaly mineral containing asbestos. And a second mixture adjusted to a particle size range that can be classified by sieving. The second mixture is prepared using a differential gravity separator, and a scale-like material composed only of a flaky mineral, and a lump and a mineral or a flaky mineral composed of a mineral other than a scale-like mineral containing a paste. An asbestos-free high-purity natural scale-like mineral, characterized in that it is separated into a lump made of

Asbestos-free high-purity natural scale-like minerals can be easily produced from natural scale-like minerals containing asbestos.

Two-fourth invention of the present invention is characterized in that, in the third manufacturing method of the present invention, the U self-specific gravity difference separation device is an air table,

Asbestos from asbestos-containing natural scaly minerals Highly pure natural scaly minerals can be produced at a low cost and with a further remarkable effect.

According to a fifth aspect of the present invention, in the fourth production method of the present invention, the air permeable sheet-like vibrating body in which wind is allowed to flow upward from below the air permeable sheet-like vibrating body provided at an inclination. The second mixture is supplied on the slanted surface, and the scale-like material is separated by moving downward by the action of gravity while being lifted by the buoyancy of the wind. Does not lift due to the buoyancy caused by the wind, and moves upward on the inclined surface due to the vibration and separates The mineral component containing the Aspes soot that is separated from the mixture and transferred to the upper side by wind circulated from below to the breathable sheet-like vibrator is collected. Is,

Breathability-mineral components, including powdered best, separated from the mixture and transported upward by wind circulated from the bottom to the top of the vibrator, can be collected and removed. It is possible to produce high-purity natural scale-like minerals that do not contain asbestos reliably from natural scale-like mineral ores containing lime and have a remarkable effect.

A sixth invention of the present invention is characterized in that, in the production method of any one of the third to fifth of the present invention, the separated scaly matter is further washed with water,

For example, the powder base adhering to the surface of the separated scale-like material and the mineral component containing the powder-like best can be removed by washing with water. High-purity natural flake-like minerals that do not contain asbestos reliably from natural scaly minerals that contain them can be produced more easily at a low cost. BEST MODE FOR CARRYING OUT THE INVENTION

Next, the contents of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram for explaining an example of an air table used in the present invention.

C, there is.

As shown in FIG. 1, the air table 1 used in the present invention is composed of a raw material mixture with a side slope 3 formed by an inclination angle α from the inlet 2 and the end of the side slope 3 as a starting point. Is An end slope 4 having an inclined angle β is formed to form an inclined descending surface inclined in two directions, and the air-permeable sheet-like vibrating body 6 From the bottom to the top, the scale-like material floating with the buoyancy by the wind is discharged, and the heavy material B contains a lump of a mineral other than the scale-like mineral containing the aspect that does not float by the buoyancy of the wind. A porous air-permeable sheet-like vibrator 6 having a discharge port 5 for discharging a lump of scale-like mineral is provided.

The raw material mixture is obtained by roughly crushing natural scale-like mineral ore containing asbestos, and making a scale-like mineral consisting of only scale-like substances and a block and / or scale pieces made of minerals other than scale-like minerals containing asbestos. This is a second mixture adjusted to a particle size range that can be classified by sieving after preparing a first mixture containing a block of minerals and a powdery asbestos.

Then, the breathable sheet-like vibrating body 6 is vibrated by a vibration that swings the breathable sheet-like vibrating body 6 in the width direction by a vibration motor (not shown) and a blower (not shown). A processing function consisting of an air updraft D formed from the lower part to the upper part of the air-permeable seat-like vibrator 6 is attached, and the synergistic effect of the upward air flow D and vibration C forming this processing function is added. The mixture can be selected based on the particle shape and specific gravity difference.

Further, the air table 1 is a fine powder of a mineral component containing an asbestos in the form of a powder separated from the mixture by the air circulated upward from below the air-permeable sheet-like vibrating body 6 and transferred upward. A dust collecting device 7 for collecting dust etc. is installed so as to cover the air-permeable sheet-like vibrating body 6. When using the air table 1 having the above configuration, the speed of the air rising air flow D from the porous air-permeable sheet-like vibrating body 6 is approximately the same as the speed at which the scaly matter in the mixture floats. When the mixture is introduced through the inlet 2 by applying an appropriate vibration to the air-permeable sheet-like vibrating body 6, the scale-like material that is lifted by air buoyancy is affected by the rising airflow and is As a result of this, it is transported while forming a flow A along the light side A, collected from the discharge port 5 on the light side A side, and can be sorted with high accuracy. As a result, it is possible to obtain a high-purity natural scaly mineral that does not contain asbestos.

On the other hand, a lump made of a mineral other than a scale-like mineral containing an aspect that does not float due to buoyancy caused by air and a lump made of Z or a scale-like mineral are separated from the mixed state of the mixture under the influence of vibration C. From the inlet 2, the slanted surface with an inclination angle β in the width direction rises upward toward the beeside B. While moving, it is collected from the outlet 5 on the heavy side B side. As a result, high-precision sorting is possible.

Then, the mineral that presents a powdery state that presents a powdery state that is separated from the mixture and transferred upward to the ascending airflow D of air circulated upward from below the air-permeable sea moving body 6. Since the material components are collected by the dust collector 7, they are not mixed with the high-purity natural scale minerals that do not contain the best recovered from the outlet 5 on the light side A side. As a result, a high-purity natural scale-like mineral that does not contain asbestos can be obtained with certainty.

The separated and recovered scale-like material was further washed with a known water washing treatment device (not shown), for example, adhered to the surface. Aspaste powdery mineral components can be removed by washing with water. As a result, a high-purity natural scale-like mineral that does not contain asbestos can be obtained more reliably.

In the present invention, the Asbestos moth-free high-purity natural scale-like mineral that is substantially free of Aspes 卜 is the Ministry of Health, Labor and Welfare's draft 0 8 2 8 0 0 1 “Asbestos content in natural minerals” As a result of analysis according to the method described in “Rate analysis method”, it is proved that the asbestos content is less than 0.1% by mass.

In the present invention, the scaly minerals are vermiculite, mica, dolomite, and the like. Examples of mica include muscovite, biotite, phlogopite, silica mica, hydrous mica, and the like.

In the present invention, mineral components other than scaly minerals containing Asbestos include serpentine containing chrysotile (asbestos), amphibolite (partially asbestos), or a mixture of one or more, Quasi-free quartz, feldspar, pyroxene, clinopite, calcite, dolomite, olivine, etc., or serpentine containing ambestos, amphibolite It is a mixture of quartz, feldspar, pyroxene, clinopite, calcite, dolomite, olivine, etc. without any asbestos.

The natural scale-like mineral ore containing asbestos as impurities used in the present invention is produced in South Africa, China, Russia, the United States, Canada, Australia, Brazil, India, Japan, etc. Yes, the scale-like mineral is the main component (for example, the scale-like mineral is about 30 to 80 yen for the whole rough, now costs). It includes a piece of smooth 卜. In order to produce a high-purity natural scale-like mineral that does not substantially contain the Aspes moth of the present invention, first, a natural flaky mineral ore containing asbestos as an impurity is sieved. By coarsely pulverizing to a classifiable particle size range using a known method, it is possible to obtain a scale-like product composed only of scale-like minerals and mineral minerals and / or scale-like minerals other than scale-like minerals containing asbestos. A first mixture containing a lump of material and powdered asbestos.

As an example of a coarse pulverizer used in the present invention and adapted to a grain size after pulverization of 0 mm or more, a specific example is as follows.

,

York Crusher, Shire 卜 U Crusher C

Single crusher, impact crusher evening,-cone crusher, pi-luke fuchsia, 8-male, disc mill, conical ball mill tube mill D

, Roller mill, stamp mill, wedge runner foot mill, vibration mill, impact mill, etc.After preparing the first compound, it was adjusted to a particle size range that can be classified by sieve. Prepare a second mixture

Specifically, the range of particle size to be adjusted is, for example, 0 2 b m m

0 mm, 0.5 mm to 1.0 mm, 1.0 mm to 2.0 mm, 20 mm to 4.0 mm, 40 mm to 8.0 mm, 80 mm to 6 mm There are 6 categories, but it may be further subdivided

In addition, the scale-like material widely used industrially has a particle size of 10 mm or less.

Asbestos, which is an impurity in natural scaly minerals, has a fibrous form in the microscopic view, but is a small lump with the naked eye. In the present invention, it is collectively referred to as “Apes 卜” which exhibits a powder form.

Next, the prepared mixture is separated into a scale-like substance composed only of scale-like minerals using a specific gravity difference separation apparatus that performs dry specific gravity separation (air sorting) or wet specific gravity separation, and a scale-like mineral containing Aspes ア. Separation into a mass composed of minerals and Z or scaly minerals and mineral components including powdered Aspes 卜

U to produce high-purity natural scale-like minerals

When a specific gravity difference separation apparatus that performs wet specific gravity difference separation is used, a drying process is required after separation, and water treatment is also required. Therefore, it is preferable to use a specific gravity difference separation apparatus that performs dry specific gravity difference separation (air selection). Examples of the specific gravity difference separation apparatus that performs dry specific gravity difference separation (air selection) include an air table and an air jig.

In the present invention, it is possible to use an air classification system using gravity and Z or inertia, and an air classification system using centrifugal force.

Specific gravity difference separation apparatuses that perform wet specific gravity difference separation include, for example, a heavy separator, a jig, a toy type, and a table type heavy liquid sorter.

Among these, the air table is preferably used in the present invention because it has a simple structure, is easily and accurately accurate, and can perform dry-type specific gravity separation of asbestos-rich high-quality natural flake minerals. it can. Example

Hereinafter, the present invention will be more specifically described by way of examples. However, the present invention is not limited to the examples without departing from the gist of the present invention. Example 1

Natural scaly minerals containing hydrous mica and vermiculite as flaky minerals and pyroxene, quartz, feldspar and asbestos containing hornblende and serpentine as mineral components other than flaky minerals Roughly grind the rough stone (roll) with a roll crusher, remove mineral components other than flaky minerals by air classification, adjust the first mixture, and then apply the first mixture to a sieve. A second mixture having a particle size adjusted to mm to l mm was prepared.

Using the air mixture (model: V-1 35, manufactured by Nitto Denki Engineering Co., Ltd.) shown in Fig. 1 for the second mixture whose particle size was adjusted to 0.5 mm to l mm, the following conditions were used. Below, the scaly substance (hereinafter referred to as the lightweight part) that receives strong air resistance is collected from the outlet 5 on the light side A side, and the mass (hereinafter referred to as the weight part) with low air resistance is recovered as heavy side B. Dust collector that collects powdery asbestos and powdery asbestos collected from the discharge port 5 on the side, separated from the mixture by the upward airflow D of the air, and transferred upward 7 And collected as dust (hereinafter referred to as dust collection powder).

(Air table conditions)

Side slope tilt angle 5.5 °

End slope angle of 7.5 °

Air flow 8.0 m ³

Frequency: 600 rpm Second mixture adjusted to particle size of 0.5-1 mm (referred to as mixture), recovered lightweight part, recovered weight part, and recovered collection According to the method shown in the Ministry of Health, Labor and Welfare's drafting of the Ministry of Health, Labor and Welfare, 0 8 2 8 0 0 1 “Asbestos content analysis method in natural minerals” At the same time, the content (mass%) of mineral components other than scaly minerals in each sample was determined using the following test method.

The results are summarized in Table 1. Figure 2 shows the X-ray diffraction results of asbestos. table

(X-ray diffraction measurement conditions)

Measurement range: 2 0 = 1 0.0. 0 to: L 3.0 °

Tube voltage and current: 40 kV, 40 mA

Counter cathode: Cu

Monochromatic: Graph Eye Monochromator Detection SB. · Scintillation counter

Slit diameter: Receiving slit 0.3 mm

Divergent screw h 1 °

Scattering slip h 1 °

Goniome overnight scanning speed • 1 Z 8. Z m

The X-ray diffraction line peak intensity (counts) of asbestos measured under the above measurement conditions is obtained by calculating the integrated intensity (peak area).

(Content of mineral components other than flaky minerals (mass%) Test method) Utilizing the fact that hydrothermal mica and vermiculite expand into a deon-like shape and become lighter by heating, put on a standard sieve. Each sample was heated to swell hydrothermal mica and vermiculite, and then wind was applied from below to blow off the lightly hydrous mica and vermiculite. As a mineral component, mass% with respect to the entire sample is obtained. From Table 1 and Fig. 2, the mixture, the amount part, and the dust collection powder were found to have gas-base cocoons and contained a large amount of mineral components other than the flaky mineral. Asbestos was not detected in the lightweight part, and it was confirmed that it was a best-free high-purity natural scale-like mineral with a small amount of mineral components other than the scale-like mineral. Industrial applicability

The asbestos-free high-purity natural scaly mineral of the present invention can be obtained by separating from a natural scaly mineral ore containing asbestos as an impurity. It is characterized by being substantially free of mineral components other than flaky minerals and Asbestos cocoons, and is substantially free of mineral components other than asbestos and flaky minerals. Therefore, it is highly safe and has a high purity, so it can improve the yield and can be applied to various applications with peace of mind, and the production method of the present invention allows natural scales containing mildew It is highly industrially useful because it has a remarkable effect that it can easily produce a high-quality natural flake-like mineral from the raw mineral mineral. Brief description of the drawings ''

FIG. 1 is an explanatory diagram illustrating an example of an air table used in the present invention.

Figure 2: A graph showing the results of X-ray diffraction of the mixture, parts by weight and dust collection. Explanation of symbols

1 Air table

2 slot

3 Sides

4 End slope

"

o Discharge port

6 Breathable sheet vibrator

7 Dust collector

α, β tilt angle

A Light Sai H

B Heavy rhino

C vibration D updraft

Claims

The scope of the claims

1. Asbestos characterized by being substantially free of mineral components other than scaly minerals and pestle cocoons obtained by separating from natural scaly minerals containing asbestos as impurities. A high purity natural scale-like mineral.

2. The asperfly high-purity natural scale-like mineral according to claim 1, wherein the scale-like mineral is Bamikyura cocoon and / or mica.

3. Roughly pulverized natural scaly minerals containing asbestos, from scaly materials consisting only of scaly minerals, and massive and non-flaky minerals composed of minerals other than scaly minerals containing asbestos And preparing a second mixture adjusted to a particle size range that can be classified by a sieve, and separating the second mixture by specific gravity difference separation. Using a device, scales composed only of flaky minerals, lumps composed of minerals other than flaky minerals containing asbestos, and lumps composed of Z or flaky minerals, and powdery asbestos And asbestos-free high-purity natural scaly mineral production process.

4. The method according to claim 3, wherein the specific gravity difference separation device is an air table.

5. The second mixture is supplied onto the inclined surface of the air-permeable sheet-like vibrating body in which wind is circulated upward from below the air-permeable sheet-like vibrating body provided at an inclination, and the scale-like While the object is lifted by the buoyancy caused by the wind, it is moved and separated downward by the action of gravity by the action of gravity, and the lump is not lifted by the buoyancy by the wind, and the action of vibration The asbestos in the form of powder separated from the mixture by the wind circulated from the lower side to the upper side of the air-permeable sheet-like vibrator and transferred to the upper side is separated while moving upward on the inclined surface. 5. The process according to claim 4, wherein the mineral component is collected.

6. The method according to any one of claims 3 to 5, wherein the separated scaly matter is further washed with water.