JPH04200739A - Production of fine ceramic balloon - Google Patents

Abstract

PURPOSE:To enhance the yield of a product by screening dried granules to bake and foam the screened granules of a predetermined particle size range, and grinding the granules on a screen by a crusher and classifying ground granules to bake and foam the granules having a predetermined particle size along with the above-mentioned dried granules. CONSTITUTION:A binder is added to finely ground natural vitreous mineral and/or an artificial vitreous material being a raw material and the resulting mixture is granulated and subsequently dried to prepare dry granules which are, in turn, screened and the obtained dry granules of a predetermined particle size range are baked and foamed. Further, the granules on a screen are ground by a crusher and the ground granules are screened and classified to remove a fine powder having a predetermined particle size or less, and the remaining ground granules are baked and foamed along with the above-mentioned dry granules. As a result, the yield of a product can be enhanced. Since the granules are baked and foamed after grinding, fine ceramic balloons free from a sharp edge and having roundness can be prepared as a product by no means inferior to a granulated product.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to the production of fine-grained ceramic balloons that can be used as lightweight construction aggregates such as thin-walled cement and mortar processed by extrusion molding or press molding, for example. Regarding the method.

[Conventional technology]

Traditionally, lightweight aggregates have been used instead of sand in cement, mortar, etc., but due to processing and performance constraints, fine-grained lightweight aggregates have been used as aggregates for thin-walled cement and mortar. required. However, in the conventional production method, the particle size range of the produced granules was wide, and there were particularly few fine particles. For this reason, fired foam products were sieved again and only fine-grained products were used.

[Problem I1 to be solved by the invention] However, the above method has a problem in that the yield of fine particles is low and the cost is high.

The present invention was made in view of the above circumstances, and provides a fine-grained ceramic balloon that can produce fine-grained lightweight aggregate using natural glass minerals and/or artificial glassy materials that exist in relatively large amounts as raw materials. The purpose is to provide a manufacturing method for.

[Means to solve the problem]

The method for manufacturing a fine-grained ceramic balloon according to claim 1, which meets the above object, involves adding a binder to finely ground natural vitreous minerals and/or artificial vitreous materials as raw materials, granulating them, and then drying them. The dried granules are then kneaded, the dried granules are sieved, and the dried granules in a predetermined particle size range are fired and foamed.The sieved product is crushed with a crusher, and then the crushed It is constructed by sifting or classifying the powder to remove fine particles with a predetermined particle size or less, and firing and foaming the crushed product together with the dried granules.

Further, the method for producing a fine-grained ceramic balloon according to claim 2 is the method according to claim 1, in which the granulation is carried out using an oscillating type mixer having stirring blades inside and having a bottom surface made of a flexible material. It is configured to perform the following.

The method for producing a fine ceramic balloon according to claim 3 is the method for producing a fine ceramic balloon according to claim 1 or 2, in which the sieved product is dried and granulated with approximately 11 over The fine powder is approximately 0. L
++- or less.

[Effect]

The method for producing a fine-grained ceramic balloon according to claims 1 to 3 includes adding a binder to finely pulverized natural vitreous minerals and/or artificial vitreous materials as raw materials, granulating them, and drying them. The dry granules are made by sieving, and the dry granules within a predetermined particle size range are fired and foamed. However, the portion of the sieve that exceeds the predetermined particle size is crushed with a crusher. Then, a predetermined particle size is fired and foamed together with the dried granules.

Therefore, although the crushed granules have some edges, they soften during the firing and foaming process and become rounded due to surface tension, and have substantially the same properties as the granules [Example] , Examples embodying the present invention will be explained to provide an understanding of the present invention.

First, Table 1 shows the components of shirasu, which is an example of a natural glassy mineral that is a raw material, and Table 2 shows the particle size distribution of the shirasu used.

Table 1 Numbers are weight %. In Table 1, Ig and 1oss are mainly composed of water of crystallization.

Table 2 If the raw material for the whitebait above contains large particles, it will cause problems in subsequent processing, so fine powder of 44 μm or less is passed through a sieve and used as the raw material.

Next, this whitebait fine powder is placed in a rocking mixer (trade name, Omnimixer) having internal stirring blades and a bottom made of a flexible material, and an aqueous sodium hydroxide solution, which is an example of a binder, is added thereto. This aqueous sodium hydroxide solution was prepared by mail (the amount of pure content added was 9 to 90% of the whitebait fine powder based on the outer division).
When added in a range of 11% by weight, the granulation yield of fine granules is improved.

As a result, fine granules of various particle sizes were produced, and when the granules were then dried and sieved, the particle size distribution was as shown in Table 3.

Table 3: If the product has a particle size of 1.0 cm or more, if it is foamed and fired as it is, the particle size of the product will become large, so it is first crushed with a crusher to reduce the particle size and then sieved again. Then, particles with a particle size of 0.1 mm or less are reduced as raw materials again.

Here, when crushing is performed using a roll crusher (A) that crushes the raw material by compression, a hammer crusher (B) that crushes the raw material by impact, and a brown mill (C) that crushes the raw material by shearing, Table 4 shows the particle size of the crushed material.

Table 4 As can be seen from Table 4, when crushing the raw material into fine particles of 11 or less, it is preferable to use a roll crusher.

Here, Table 5 shows a comparison of the properties of crushed fine grains and as-granulated fine grains after firing and foaming them through the steps described below. It can be seen that even if it is present, it can be used with no inferiority to the granulated product. Furthermore, when the finished product was examined under magnification, it was found that the corners caused by crushing disappeared during the firing and foaming process, and the product became fine particles with roundness as a whole.

Table 5 Here, the water absorption rate is measured according to the JISA1109 fine aggregate water absorption test method, and the strength is measured using a Honya type hardness tester.
This refers to the average crushing strength at 0 points.

Therefore, the crushed fine particles produced through the above steps are mixed with the granulated fine particles and sieved by a gyro sifter.

After this, fine grains of the required particle size are selected and a high melting point fine powder is applied to the fine grains. This operation is performed using the omnimixer described above.

Next, these dried products are fired and foamed using a vertical furnace. This vertical furnace has a burner at the bottom,
It generates hot air and exhausts it to the outside from the upper exhaust stack,
The above dried fine particles are put in from the top, and the hot air
This is done by heating to 50-950°C, which softens the glass inside and causes the fine shirasu particles to foam and increase in diameter by about 20%, producing a fine-grained ceramic balloon.

As a result, strong glass balloons with relatively small particle sizes can be produced at low temperatures, and granulated products with large particle sizes can be crushed into fine particles using a crusher.
Yield will be improved.

In the above embodiments, shirasu was used as the natural glassy mineral, but the present invention can also be applied to other materials such as flintstone, perlite, and volcanic rhyolite.

Next, an artificial glassy material crushed to 0.44 μm or less is used as a raw material, and a sodium hydroxide aqueous solution, which is an example of a binder, is added to it, with a pure sodium hydroxide content of about 11% of the above raw material, and carbonic acid. Approximately 3% of the above raw material was mixed with calcium, thoroughly stirred, and treated in the same manner as in the above example using the above-mentioned oscillating mixer to produce a ceramic balloon. Its properties are shown in Table 6.

Table 6 [Effects of the Invention] As is clear from the above explanation, the method for manufacturing a fine-grained ceramic balloon according to the present invention is performed by crushing the granulated fine particles with a large particle size before firing and foaming them. Since the powder is crushed to an appropriate particle size, the yield of the product can be improved.

Then, after crushing, firing and foaming are performed, so that a fine ceramic normal grain with rounded corners is obtained, and a product comparable to a granulated product can be manufactured.

Agent: Patent Attorney: Fujio Nakamae

Claims (3)

[Claims] (1) Add a binder to finely ground natural glassy minerals and/or artificial glassy materials as raw materials and granulate them,
Next, drying to produce a dry granule, then sieving the dry granule, firing and foaming the dry granule having a predetermined particle size range, and crushing the sieved product with a crusher, A method for producing a fine-grained ceramic balloon, characterized in that the crushed material is sieved or classified to remove fine particles of a predetermined particle size or less, and the crushed material is fired and foamed together with the dried granules. (2) The method for producing a fine-grained ceramic balloon according to claim 1, wherein the granulation is carried out using an oscillating mixer having internal stirring blades and a bottom made of a flexible material. (3) The method for producing a fine-grained ceramic balloon according to claim 1 or 2, wherein the sieved product is a dry granulated product with a size of about 1 mm or less, and the fine powder is a dry granule with a size of about 0.1 mm or less.