JP2500221B2 - Method for producing paving stone material made of mineral material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a paving stone material made of a mineral material having appropriate strength and water permeability, which can be used for an interlocking block with good drainage used for sidewalks and the like. is there.

[0002]

2. Description of the Related Art Conventionally, as mineral materials used for this kind of application, cut stone materials, granulated ceramics or ceramic crushed products are solidified with clay and baked, synthetic resin or the like, or polyurethane foam. It has been manufactured by immersing the body or prepolymer in a mineral material suspension and then firing it, but in some cases, the strength is insufficient or the porosity is poor, so the sidewalk paving stone that is the application considered by the present inventor. In case of such as, there is a possibility that water may accumulate due to poor permeability of rainwater. There is also a problem that natural stone materials become expensive due to lack of manpower, and it has been desired to develop an alternative method for producing a paving stone material made of a mineral material, which has appropriate strength and good water permeability.

[0003]

Conventionally, there has been an example in which an organic water-soluble polymer is blended with sand, for example, in molding of foundry sand. In this method, the present invention is intended. It is not suitable for the field of use because it does not have sufficient strength.

Further, when water glass is simply used as a binder, the surface of sand is unevenly sprinkled with water glass, and due to the excessively viscous physical properties of water glass,
It is difficult to sufficiently impregnate the inside, and even if pressure molding is performed, the adhesive strength is insufficient, so that firing at 600 to 1300 ° C.
Mold holding power is not enough.

Under the above circumstances, it is an object of the present invention to provide a method for producing a paving stone material made of a mineral material, which has suitable strength and good water permeability and is suitable for the above-mentioned fields of use. It is a thing.

[0006]

Means for Solving the Problems The present inventor has accomplished the present invention as a result of extensive studies.

That is, according to the present invention, at least one surface of mineral particles, ceramic particles and vitreous particles is sprinkled with water glass, and then hot air is blown therein to dry it to form a film, which is then pressure molded. The gist is a method for producing a paving stone material made of a mineral material, which is characterized by producing a molded product by heating and firing.

As the mineral particles used in the present invention, those having a range of, for example, about 0.1 to 5 mm obtained by crushing natural stone, and having a uniform particle size within that range are used in some cases. As natural stones, for example, rhyolite, obsidian, pearlite, and other glazed rocks are preferable. Ceramic particles and glass particles having the same particle size can be used.

As the water glass, various commercially available water glasses can be used. Above all, a gel-like special silicic acid obtained from acid clay having a layered structure is used as a raw material and reacted with caustic soda to synthesize it. Soda silicate (trade name, MIZU
KANEX-100, manufactured by Mizusawa Chemical Industry Co., Ltd., etc. are advantageously used.

In the present invention, first, the above-mentioned particles are mixed with water glass in an amount of about 3 to 15% by weight and mixed. After mixing, hot air is blown in to heat and dry at about 40 to 70 ° C. The hot air spreads over the entire particles and can be uniformly heated and mixed with the water glass, and the water glass on the surface of the particles has an appropriate viscosity due to heating. By utilizing this viscosity for adhesion between particles, molding becomes easy, and a porous molded product having good shape retention can be obtained.

That is, after the mineral particles mixed with water glass are dried, water glass is used as a binder and a mold having a release plate at the bottom is used to maintain an appropriate gap between the particles, for example, Pressure molding is performed at about 100 to 500 Kg / cm ² . The pressure-molded product has a sufficient shape-retaining property due to the water glass binder, and the subsequent firing can be performed without any trouble. The water glass on the surface of the particles forms a film of water glass on the surface of the particles by drying, but it can be removed from the mold without adhering to the mold. On the other hand, the binder films on the surface of the particles can be pressed against each other at the contact portion, and thus the obtained molded product can be fired and sintered while maintaining its shape.

That is, the molded product molded on the release plate is dried or dried and then baked at 900 to 1300 ° C. to obtain a product, or the molded product is further heated at 50 to 70 ° C. when necessary. After drying in a drying oven for 10 to 30 minutes, water glass is impregnated onto the product at a temperature of 50 to 70 ° C. by a method such as spraying or dipping, and dried again according to the desired strength. This dried molded product is 900-1
Bake at 300 ° C. to obtain a product having sufficient strength.

Regarding the porosity of the calcined product, when a mineral raw material in the above particle size range is used, when the water glass film on the surface of the particles is 0.1 mm or less, the porosity of the particles is Porosity is easy to form. Since the particles sinter at the contact points, many continuous pores are obtained.

Regarding the sinterability, since water glass permeates the surfaces of the mineral particles and sinters them, the adhesion between the particles is strengthened and a strong porous molded article is obtained.

This is a binder having elasticity such as anhydrous water glass and hydrated water glass produced from a small amount of water, and firmly adheres to each other while forming porosity between the mineral particles. It is thought that

According to the present invention, it has been possible to produce a stable and strong porous molded article which has never been considered.

Regarding the gelation of water glass, it is said that, from the polymerization of silicic acid monomer, the colloidally aggregated particles spread throughout the solution by a siloxane bond to form a strongly bonded gel.

However, according to the present invention, even if ordinary water glass is used, it is dried by hot air with stirring, molded, and then heated and fired, so that an elastic adhesive state which does not return to dryness is likewise obtained. It has been found that a stable molded product can be obtained by maintaining

In this manner, according to the present invention, it is possible to manufacture a paving stone material made of a mineral material, which has suitable strength and good water permeability and which can be used for a sidewalk interlocking block.

In order to make the present invention easier to understand, the present invention will be further explained with reference to the drawings.

1a to 1c schematically illustrate the method for producing a paving stone material of the present invention, in which a is a water glass coating on the surface of the mineral particles by mixing mineral glass with water glass and drying with hot air. , B illustrates the pressure molding of mineral particles having a water glass coating, wherein the particles are bonded at the contact point of the water glass coating and continuous pores are formed between the particles. It c illustrates that when the molded body is fired, water glass penetrates into the inside of the particles to form a strong sintered body.

[0022]

Example 1 To a dried rhyolite grain of 5 mm or less, 12% of water glass was added, mixed with a mixer for 30 minutes, and then cured with a curing kneader.
Knead and dry by blowing hot air of 0 to 60 ° C.

After confirming that viscosity appears on the surface of the rhyolite, it is transferred to a weighing hopper. Weigh the specified weight, put the plate in the mold and fill.

The product is molded by a flexion press, the plate is removed, completely dried in a secondary drying chamber at 100 to 150 ° C., then placed in a baking furnace and baked at 950 ° C. for 10 hours to obtain a finished product.

Example 2 15% of water glass was added to dried silica sand of 2 mm or less and 0.5 mm or more, mixed for 1 hour with a mixer, and hot air of 50-60 ° C. was sent by a curing kneader to knead and dry. To do.

When the surface of the silica sand becomes sticky, it is transferred to a weighing hopper, the specified weight is weighed, and a mold plate is placed in a mold for filling.

Molding with a press, removing the lapping plate,
After completely drying at 150 ° C., it is baked at 1200 ° C. for 12 hours in a baking furnace to obtain a finished product.

Example 3 6% of water glass was added to mullite grains of 0.5 to 1 mm, and the mixture was mixed for 30 minutes with a mixer, and then with a curing kneader to 50
Knead and dry by blowing hot air at -60 ° C.

After confirming that viscosity appears on the surface of the mullite grains, the mullite grains are transferred to a weighing hopper. Weigh the specified weight, put the plate in the mold and fill.

After molding with a flexion press, removing the plate, and completely drying in a secondary drying chamber at 100 to 150 ° C.,
It is put in a baking furnace and baked at 1250 ° C. for 13 hours to obtain a finished product.

Example 4 14% of water glass was added to a 4 mm under-product of waste glass particles, mixed for 20 minutes with a mixer, and mixed with a curing mixer for 6 minutes.
Hot air of 0 to 80 ° C. is blown in and mixed and dried for 50 minutes. After confirming that viscosity appears on the surface of the glass particles, transfer to the weighing hopper. Weigh the specified weight, put the plate in the mold and fill. It is molded by a flexion press, the plate is removed, completely dried in a secondary drying chamber at 100 to 150 ° C., placed in a firing furnace, and fired at 800 ° C. for 10 hours to obtain a finished product.

Example 5 90 parts of 4 mm under-product of scrap glass and 2 mm of feldspar
Water glass (15%) was added to the mixture of 10 parts of the under product, and the mixture was mixed for 20 minutes with a mixer to obtain a finished product in the same manner as in Example 4.

Example 6 85 parts of a waste glass 4 mm under product and a waste ceramic product 3
To a mixture of 15 parts of mm under product, 15% of water glass is added and mixed for 20 minutes with a mixer to obtain a finished product in the same manner as in Example 4 below.

Example 7 30 parts of waste glass 2 mm under product, and ceramic waste product 4
15% of water glass is added to the mixture with 70 parts of mm under product, and the mixture is mixed for 20 minutes by a mixer to obtain a finished product in the same manner as in Example 4.

[0035]

As described above, according to the present invention, the mineral particles and water glass as a binder are mixed under hot air to form a uniform water glass film on the surface of the particles, thereby maintaining the shape retention property. A good molded product can be obtained, and this can be fired to obtain a paving stone material which is a porous molded product excellent in strength and water permeability.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a production method of the present invention.

Claims (1)

(57) [Claims] 1. A surface of at least one of mineral particles, ceramic particles and glass particles is sprinkled with water glass, and then hot air is blown to dry the film to form a film, which is press-molded and molded by heating. A method of manufacturing a paving stone material made of a mineral material, which comprises manufacturing an object.