JP4756679B2 - Shiroki stone powder sintered body and manufacturing method thereof - Google Patents

Description

  The present invention relates to a visitor stone powder sintered body obtained by molding, drying and firing a kneaded product of a visitor stone powder and water, a method for producing the same, and a visitor obtained by drying and firing a secondary formed product excavated from a semi-dry product. Stone powder sintered body and its manufacturing method, and the stone powder sintered body including carbide, which is embedded in the kneaded material, molded, dried, and sintered, and its manufacturing method, and further, these sintered bodies are used. It relates to containers and figurines, fishing reefs and algae reefs, or water purification materials.

  Stone materials are very few products, and a large amount of scraps and grinding / polishing scraps are generated during the mining and processing stages. Nowadays, products are increasingly imported from foreign countries, especially from China, but the processing of these mining and processing scraps has become a major problem in areas that use stones produced in the country.

  This is also the case with Kuroshiki stone, a kind of tuffy sandstone. Previously, the powder was used for glaze of stone stone roof tiles, but now its use is almost gone. Furthermore, some of the waiting stones are ubiquitous with calcium carbonate-rich calcite, which causes changes over time and makes the stones tatter, so even if they are mined at a corner, a significant percentage of the defective stones are discarded to the stone. (About 70%).

  For this reason, many vendors deal with the processing of mining scraps and processing scraps by storing processing scraps on their premises, but this is not a radical measure. There is a need for a technology for mass processing at low cost.

  From such a point of view, the present inventors have developed a technology for making powdered stone processing waste and defective stone material into powder and using them as porcelain (Patent Document 1). First, crushed stone processing scraps etc. are pulverized with a crusher such as a crusher or powdered with a Los Angeles scrubber and then sieved to obtain a powder having a particle size of about 0.85 mm or less, or about 0.425 mm or less. . However, what kneaded this powder with water was inferior in adhesive strength and shape retention required for porcelain clay and was not useful at all.

Therefore, in the invention of Patent Document 1, this powder was further finely pulverized, or kaolin and feldspar powders were mixed to about 20 to 50%, and succeeded in making clay.
JP 2003-327466 A

  On the other hand, in the field of forestry, the processing of thinned wood is now a big problem. Thinned wood is also used for log houses, piles, etc., but small trees of 15 cm, especially 10 cm or less have little use other than chipping. However, the demand for chips is currently decreasing, and due to the aging of forest workers, most of the thinned wood is left in the mountains. In terrible places, thinning is not performed sufficiently and the growth of good wood is hindered.

  Therefore, various application development studies have been conducted in various places, such as using thinned wood for fishing reefs or charcoal and laying on the bottom of rivers. However, in the case of fishing reefs, there are advantages such as easy growth of algae, but they are eaten by shipworms and the like and have only about one year. Moreover, when they are laid at the bottom of the river, they will rise up and do not achieve their full purpose, and none of them are decisive.

  In addition, a large amount of wood waste such as bark, sawn timber, sawdust, and construction waste generated when demolishing a building is generated in various places. Wood waste has been treated by incineration or landfill, except for use as fuel, but conventional treatment has become difficult due to incineration restrictions and landfill reduction.

  However, even with relatively soft stones, pulverization with a ball mill takes time and cost, and it is difficult to achieve the purpose of mass-treating stones with low cost. On the other hand, a mixture of kaolin and feldspar fine powder uses kaolin and feldspar fine powder in a high proportion, so it costs more and the degree of processing waste is reduced.

  Therefore, in order to process a large amount of processed stone processed scrap, a technique for using the powder as a powder is required in addition to making the processed stone powder into porcelain.

  By the way, the visiting stone contains an organic substance, and when the stone itself or a powder obtained by adding water to a powder is fired, the organic substance is lost in the fired product to become a fine continuous porous material. Utilizing this phenomenon, the present inventors have succeeded in firing a granulated stone product or a granular molded product of powder into a filter medium (Japanese Patent Application No. 2004-180922).

  Therefore, the present inventors obtained hints on the firing of the granular molded product of this powder, and kneading the granite stone powder with water in the same manner as cement without using the porcelain stone powder as porcelain. The present invention was completed by conducting experiments on molding, drying and firing under conditions.

  That is, the fired product of the present invention is (1) a kneaded product of a granite powder and water molded and then dried, and (2) a semi-dried molded product with an arbitrarily shaped engraving or It is roughly classified into a product obtained by drying a secondary molded product that has been subjected to excavation work such as digging and firing, and (3) a product obtained by embedding wood in a kneaded product and then drying and firing it. Further, (4) a kneaded product mixed with fir shells, sawdust or other organic small lumps, (5) a product that has been glazed and fired, (6) Also included are those that place a carbon-containing material such as charcoal around and baked to reveal a wind-like pattern.

  Molding is usually carried out by pouring a kneaded mixture of waiting stone powder and water into a mold, but it also includes rolling by hand or extending with a roller and drying in that state. In addition, firing is usually performed after release, but in the case of a combustible material such as dunhole, it may be fired together with the mold. Since the kneaded material is hardened by drying unlike the case of cement, the mold must be made of a water-permeable material.

  The powder of the present invention is in the form of sandy clay mixed with gravel (clay mixed with gravel). Here, clay refers to particles having a particle size of 5 μm or less (classified by the Geological Society of Japan, hereinafter the same). Silt is 5 to 75 μm, fine sand is 75 to 250 μm, medium sand is 250 to 850 μm, coarse sand is 850 μm to 2 mm, and fine gravel is 2 to 4.75 mm. And the powder of this invention says what contains 5% or less of 2.60 mm or less gravel. These ratios are about the curve a in FIG. In addition, gravel mixed silty clay has a larger proportion of silty than gravel mixed sandy clay, and is closer to clay. In the case of the present invention, both can be used similarly.

  This granite-mixed clay (or gravel-mixed silty clay, the same shall apply hereinafter) shaped granite powder is 10 to 40 parts by weight, more preferably 20 to 30 parts by weight of water per 100 parts by weight of the powder. Kneaded and used. The kneading method is not particularly limited, but if a small concrete mixer is used, a small amount of kneaded material can be easily obtained. In the case of a large amount, a larger mixer may be used.

  In the case of the curve (b) in FIG. 4, it contains 15% or more of pebbles of 2.60 mm or more, and is geologically called gravelly soil. In this case, the plastic limit is increased, which tends to cause molding defects. Therefore, it is necessary to add a binder such as water glass or pressure molding. The size of gravel that can be used in the present invention is substantially about 5 mm or less, and if it is more than that, the molded product becomes brittle.

  In the case of clay mixed with gravel, there is no such difficulty, so in the present invention, mainly clay mixed with gravel is used. Good. In any case, since the mobility of water is good, cracks due to the uneven distribution of water are much less likely to occur than in a normal clay molded product.

  By the way, the visiting stone referred to in the present invention is a visiting rust stone. Kurusu rust stones are the tuff sandstones that make up the lower layer of the Izumo Group in the Neogene Miocene Izumo Group widely distributed on the south coast of Lake Shinji in Shimane Prefecture. It is concentrated in the area of the rocky facies among the massive tuffy coarse-grained sandstone, and it exists in the range of about 10km east-west from Yatsuka-gun Tamayu-cho to Shinji-cho and width of 1-2km. This stone is soft and easy to mine and process, and Izumo stone lantern is designated as a traditional craft.

  This coming rust stone is composed of a wide variety of rock pieces and crystal pieces, and a substrate for filling them. The size of the rock fragments is often 0.5 mm to 1.0 mm in diameter, and is about 1.5 mm at the maximum. The proportion of rock and crystal fragments is as high as 80%. As rock fragments, andesite, quartz andesite, rhyolite, flowering rock, and various types of tuff have been confirmed. As crystal fragments, plagioclase, pyroxene, amphibole, biotite, opaque minerals, volcanic glass, and altered minerals have been confirmed. In addition, zeolites, chlorite and carbonate minerals produced by alteration have been confirmed as substrates.

  Many of these minerals are called clay minerals, and this seems to be the main reason why the ground rust stones can be used as clay and clay. In addition to the coming rust stone, there is what is called the coming shiroishi. This is an old chronologically rhyolite-type part that has changed to montmorillonite and cannot be used in the present invention.

As the analytical values are shown in Table 1 (“Shimane Geology” published by Shimane Prefecture), the incoming rust stone contains a lot of iron (6.13% as Fe ₂ O ₃ ). Therefore, the porcelain clay of the present invention is colored red, brown to black color when fired. However, in the case of the present invention, since it is used for civil engineering work and fishing reefs, the color of the fired product is not a problem. In the table, the numerical value indicates weight percent. Further, as is apparent from Table 1, the incoming rust stone contains about 7% loss on burning (Ig. Loss). This is an ancient plant residue, which disappears during firing and creates micropores.

  The powder of visiting stone is obtained by crushing inferior stones, scraps, grinding scraps, etc. with a crusher such as a crusher, and sieving fine grinding scraps as they are (2.65 mm or less). . The particle size distribution is almost similar to the particle size accumulation curve of FIG.

  Add 10 to 40 parts by weight of water to 100 parts by weight of the powder, and stir and mix with a concrete mixer. When the amount of water is 10 to 20 parts by weight, the mixture is difficult to fill and fill the mold, but any pressure type can be used. Moreover, in 30-40 weight part, there exists a difficulty which a lot of water | moisture content takes time for drying, and a gravel with a large particle diameter tends to settle. More preferably, it is 20-30 weight part. Most preferred is around 23 to 26 parts by weight. Depending on the amount, the mixing time is about 10 to 50 minutes, more preferably around 30 minutes.

  In the case of visiting stone powder having a particle size distribution of gravelly soil, it can be obtained by sieving (5 mm or less) in the same manner. The distribution of the particle size is almost similar to the particle size accumulation curve of FIG. In this case, 10 to 40 parts by weight, more preferably 20 to 30 parts by weight of water with respect to 100 parts by weight, and kneaded and dried, or A binder such as water glass is further added to water, kneaded and molded, dried, and then fired.

  Among the baked products of the present invention, the above-mentioned baked product (1) is the simplest and suitable for mass production, and has a variety of water purification materials, fishing reefs, algae reefs, tiles, bricks, blocks and the like. Dimensions can be manufactured. In addition, the baked product can be used as a water purification material or artificial soil.

  The fired product of (2) described above should be called a simple stone processed product, and a secondary molded product obtained by subjecting a semi-dried molded product to digging work such as engraving or digging of an arbitrary shape is dried, This is fired. The semi-dry state refers to a state in which the kneaded product is somewhat hardened and becomes self-supporting. This semi-dried molded product is dug with a spoon or the like and cut with a knife or the like to form a container such as a basket, a dish or a flowerpot (secondary molded product), and then dried and fired to produce a stone The containers are easily obtained. In addition to containers, plate-like or other semi-dry moldings can be used and engraved to obtain a stone figurine in the same manner. In these cases, further changes can be given by glazing (5) and tanning (6).

  The major feature of the present invention is that cracking and deformation due to firing hardly occur not only in the case of (1) with a thickness but also in the case of (2) in which the thickness and width are varied by engraving and engraving. . The reason will be described later.

  These baked products are originally porous and burnt into organic cavities, so that they are porous and have a specific gravity smaller than water (less than 1) and lighter than water. In that case, a lighter one with a specific gravity close to 0.7 can be easily obtained (when 13% by weight of sawdust is mixed). Organic matter lump such as sawdust can be mixed up to about 15%, but these remain partially carbonized during firing, but most of them disappear as carbon dioxide. Accordingly, the block thus obtained has a weight of 1/3 compared to a normal cement product (specific gravity about 2), and is optimal for use by women in gardening and the like. Moreover, when it is made into a tile, it does not slip and is light and has excellent sound absorption. Furthermore, since it is very porous, a very excellent water purification material, fishing reef, and algae reef can be obtained. Kneaded material mixed with fir shells, sawdust and other organic small lumps, (5) Molded product glazed and fired, (6) During firing, charcoal etc. inside and around the molded product Also included is a carbon-containing material that is fired and exposed to a wind-like pattern.

  Next, as described in detail below, the fired product of the above (3) can be obtained as a granite sintered body including a carbide. First, wood and wood waste will be described. Wood is mainly made of charcoal, and thinned wood is mainly used from the viewpoint of using thinned wood. However, it is not limited to thinned wood, and pillars and rafters are also used among building waste. Woody waste refers to bark, sawdust, crushed and pulverized products of wood, etc. In the present invention, it is an idea including rice husks and grasses (raw grass and dead grass). And this woody waste material is used as a lump or filled around wood.

  A lump of wood waste is used in place of or together with wood, and the wood waste is filled in a bag, molded, or placed in a pipe and filled with a covering material, and then the pipe is pulled out. To form. However, wood waste materials are often small pieces, so if the firing temperature is high, combustion ashing may occur. This is not the case with wood.

  Next, the manufacturing method of the visiting stone powder sintered compact containing the carbide | carbonized_material of this invention is demonstrated. First, wood or wood waste wood is stored in the center of a water-permeable formwork such as a paper tube, and filled with a kneaded mixture of kishimachi powder in water around, around, and at the top and bottom. Dried and then fired. In this case, there are two problems.

  One is the problem of cracking. This is due to the fact that when only wood is used, shrinkage to the inside is prevented at the stage where the filled kneaded product is dried. In the case of the present invention, cracks do not become large at the time of sintering, and also work to improve the penetration of water into the inside, that is, the charcoal portion. However, since the appearance is poor, the commercial value is lowered. In order to prevent cracking, it is better to fill the wood with fine wood waste such as sawdust and rice husk. This is because an air layer such as sawdust and rice husk absorbs shrinkage stress to the inside due to drying of the stone cover material. To fill wood waste around the wood, for example, store the wood in a pipe installed in the center of the formwork, stuff the wood waste around the wood and inside the pipe, and fill the kneaded material Thereafter, the pipe is pulled out.

  Another problem is whether or not to cover the upper and lower parts when covering a lump of wood or wood waste with a kneaded material. When the upper and lower sides of wood and the like are completely sealed with a kneaded product, the wood and the like are steamed during firing, and complete charcoal is obtained. On the other hand, if it burns in an atmosphere with a lot of oxygen without covering the top and bottom, the wood burns to become ash, and the fired product just wants to see a clay pipe. When calcinated in an oxygen-poor state, the charcoal remains to some extent, but if it is to remain completely, it is preferable to cover the upper and lower parts of the wood with a kneaded material.

  When covering the top and bottom of wood with a kneaded material, cracks due to drying of the kneaded material filler are completely prevented by providing a layer of wood waste material between the wood and the kneaded material, that is, at the bottom and top of the wood. Is done.

  Unlike the cement, the kneaded product of the present invention has no self-solidifying ability, and is solidified by drying and firing. Therefore, it is necessary that the mold has water permeability such as a paper tube so that the kneaded material filler can be dried. In order to reinforce the kneaded material filler, a wire mesh may be installed in advance inside the paper tube. Band reinforcement may be provided at several places around the trunk as a paper tube reinforcement. As the mold frame, a metal frame, expanded metal, punched metal or the like that is reinforced with a frame can be used. In this case, the kneaded material is filled with the sandbag bag inside. Note that the bottom of the mold is more convenient for demolding. In the case of bottomless, it is better to lay a sheet or kraft paper under the formwork.

  Next, drying and firing of the kneaded material filler will be described. The time required for drying and firing varies greatly depending on the volume and shape of the kneaded material filler. Therefore, a case of a bowl-shaped kneaded material filling body having a diameter of 30 cm and a height of 50 cm and having a reinforcing wire mesh installed on the surface will be described as an example. In the case of a kneaded material filler of such a size, it takes about one week in the mold, one week after removing the mold, and one week after removing the wire mesh. The drying process for one week after the removal of the wire mesh can be replaced by drying in a furnace at 50 to 100 ° C. for about 12 hours.

  Next, the firing temperature will be described. In general, when the clay made of visiting stone powder is fired as a pottery, it is fired at 1100 ° C to 1180 ° C. When the temperature is lower than 1100 ° C., the so-called unglazed form in which baking is insufficient and water is leaked. Moreover, if it is 1180 degreeC or more, it will melt | dissolve and a sagging will arise. A more preferable firing temperature is 1120 ° C to 1140 ° C. In this case, a fine structure in which the fine particles enclose and melt the large-size sand and does not leak water is obtained. In this case, however, the air permeability is maintained. However, the water-filled product of the present invention preferably has some water leakage. Therefore, the main baking is performed at a temperature of 950 ° C. to 1180 ° C., more preferably 1000 ° C. to 1120 ° C.

  In order to obtain an unglazed product that is somewhat inferior in strength but excellent in water permeability, the kneaded product filler of the present invention may be unfired and fired at a temperature of 500 ° C to 950 ° C, more preferably 750 ° C to 800 ° C. What is necessary is just to use a calcination temperature properly according to the use etc. of the visiting stone powder sintered compact containing this invention carbide | carbonized_material. Here, the firing temperature is the maximum temperature.

  In addition, although the kneaded material filler of the present invention has a very large thickness, it can be fired without cracking. The reason is not clear, but it is presumed that there is sand and silt to absorb the shrinkage.

  In the case of the present invention, the firing is performed in an electric kiln, and the firing time depends on the thickness and size of the covering material filler, but it takes 10 to 16 hours to reach the maximum temperature, and the maximum temperature is several tens of hours. After maintaining the minute or immediately, turn off the power and gradually cool down for 1-2 days. Of course, it can be used not only with electric kilns but also with kilns that use fuel such as kerosene, gas, and firewood. In addition to a single kiln, it can be fired in a climbing kiln or a continuous kiln. In particular, when bricks and tiles are industrially fired, it is preferable to use a continuous kiln suitable for mass production.

  As described above in detail, the granulated stone powder sintered body of the present invention comprises a kneaded mixture of granulated stone powder having a particle size distribution of gravel-mixed sandy clay, gravel-mixed silty clay or gravelly soil and water. It is dried after molding and then fired.

Therefore,
(1) It can be effectively used without discarding scraps, grinding scraps, polishing scraps, and defective stones generated during processing of the waiting stones.
(2) The present invention is not limited to the use of processed stones, but allows the consumption of the processed stones to be expanded as an industry by actively crushing and using the processed raw stones themselves.
(3) Since it is only necessary to knead the sieved granite powder with water and form and fire it, it can be produced easily and in large quantities as long as there is equipment.
(4) In the case of porcelain, cost and labor are required, but in the case of the present invention, since it is molded and dried, such a problem does not occur, and a large amount of processing is possible.
(5) Since the specific gravity is light and porous, it can be used for various purposes such as water purification materials, fishing reefs, algae reefs, tiles, bricks and blocks.
(6) By mixing fir shells, sawdust and other small organic matter in the kneaded product, a product having a very low specific gravity can be obtained.
(7) By arranging and firing a carbon-containing material such as charcoal inside or around the molded product at the time of firing, it is possible to express a tanned pattern.
(8) By drying and firing the secondary molded product obtained by performing excavation work on the semi-dried molded product, containers and figurines similar to the processed stone products can be easily obtained. In this case, further changes can be given by glazing and tanning.
(9) When wood and the like are embedded and fired, effective use of thinned wood is promoted. In particular, thinned wood can be carbonized without charcoal burning.
(10) The obtained granite stone sintered body including the obtained carbonized material carbonizes the thinned wood and turns the granulated stone powder into a porous calcined product. Due to the synergistic effect of the charcoal and the calcined product, not only water purification, When it is put into water, which is a drawback of charcoal, it prevents floating, burying in mud, adsorbing mud components, and giving strength. In addition, charcoal has much finer pores than the burnt stone powder, making it an ideal place for microorganisms.
(11) The visitor stone powder sintered body containing this carbonized material is used for valley stop materials, riverbed materials, river revetment fence materials, water purification materials, etc. to help protect the environment in terms of water purification, This is a very useful technology that helps protect the environment in terms of promoting use. In addition, if it is used as a reef material, it will not be eroded in a short period of time like wood or will be inferior in strength like charcoal, the generation of algae will be good, and both the charcoal and visiting stone sintered bodies will have micropores. It is an ideal place to become a good place for microorganisms.

    A kneaded mixture of granite powder having a particle size distribution of sandy clay mixed with gravel and water is formed into a semi-dried state, which is subjected to excavation work to form a secondary formed product, and then dried and fired. Also, the wood and the wood waste in the state surrounding it are stored in the water-permeable formwork, and the kneaded material in which the stone powder is kneaded with water is filled around and above and below, so that the wood etc. is placed in the kneaded material. It is embedded to form a kneaded material filler, which is dried and fired.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a process of manufacturing a kneaded material filling body 7 which is a base of the carbide-containing conventional waiting stone powder sintered body 1 of the present invention. FIG. It is a top view except a head. First, as shown in FIG. 1 (a), a kneaded product 3 prepared by kneading a granite stone powder with water is introduced into a bottom of a paper tube 2 having an inner diameter of 30 cm and a height of 50 cm at a thickness of about 5 cm. Next, a pipe 4 having a diameter of 20 cm is installed at the center of the paper tube 2, and thinned material 5 (about 15 cm diameter) and sawdust 6 are packed therein. Next, the kneaded material 3 is filled around the pipe 4, the pipe 4 is pulled out, sawdust 6 is placed on the head of the thinned material 5 to a thickness of about 5 cm, and then the kneaded material 3 (thickness 5 cm) is placed so as to cover the whole. 1 (b), the kneaded material filling body 7 shown in FIG. 1 (c) is obtained. Reference numeral 8 in the figure denotes a wire mesh for protecting the kneaded material filling body 7.

  In the carbide inclusion waiting stone powder sintered body 1 obtained by firing the kneaded material filler 7, the thinned material is carbonized to become charcoal 9 as shown in FIG. Sawdust 6 burns and burns depending on the firing temperature. The kneaded material filling body becomes a ceramic-like sintered body 10. And the part which sawdust 6 became the space | gap 11, and plays the role of the moisture control which capture | acquires and discharge | releases the moisture in the air which permeate | transmits from the sintered compact 10 in this part. In addition, in the water, it becomes a breeding zone for the microorganisms in the water penetrating from the sintered body 10, and provides a water purification function by the microorganisms together with the charcoal 9. Note that FIG. 2 is a plan view showing a state cut along a line XX in FIG.

  Firing was performed by an electric furnace with a firing pattern shown in FIG. Here, the first 12 hours is a drying process. Then, the temperature was raised to 1120 ° C. in the next 12 hours, and then the power was turned off and the mixture was allowed to cool. The size of the above-mentioned carbide inclusion waiting stone powder sintered body 1 was 28 cm in diameter and 49 cm in height. Therefore, the shrinkage ratio due to the firing was about 8.5%. The shrinkage rate is about 10%.

  When the carbonized inclusion waiting stone powder sintered body 1 was installed in water, it was examined whether the sintered body 10 could collapse. A small piece (10 cm square) of the sintered body 10 was immersed in 1 day and dried for 1 day for 30 days. However, the same shape as before the test was maintained, and there was no deformation.

  FIG. 5 shows another example of the formwork. This mold 20 is a two-piece structure in which a punching metal 21 is reinforced by a frame 22. Reference numeral 23 is a butterfly plate, and 24 is a stopper. In the case of this form 20, since it is rough, it is used in the same manner as the paper tube 2 described above after putting the sandbag 25 inside. In the case of the paper tube 2 and the mold 20, the bottomless one is more convenient for demolding. In the case of bottomless, it is better to lay a sheet or kraft paper under the formwork.

  FIG. 6 shows another example of the carbide-containing conventional waiting stone powder sintered body 30. The carbide-containing conventional waiting stone powder sintered body 30 has a rectangular parallelepiped shape as a whole, and the charcoal 31 is housed in the same rectangular parallelepiped shape. It is of shape. This carbide inclusion waiting stone powder sintered body 30 is convenient when laying on a riverbed or a riverbank.

  FIG. 7 shows an example in which the carbide-containing waiting stone powder sintered body 1 of the present invention is used as the valley stop material 41 and the river bed material 42 of the valley river 40. As a result, the humus components and turbidity of Tanikawa are removed and purification is performed. FIG. 8 shows an example in which the river 43 is used as a river revetment fence material 44. In this case as well, promotion of purification of river water is expected.

  FIG. 9 (a) shows a semi-dried product in which water is kneaded at a ratio of 25 parts by weight to 100 parts by weight of granite stone powder having a particle size distribution of gravelly sandy clay and then placed in a mold (not shown). It is sectional drawing of the state which excavated and formed the shape of the collar 51 from the molded object 50. FIG. In the figure, the hatched portion is the excavation site. The semi-dried cocoon 51 is dried and then fired, but even if the wall surface of the cocoon varies, it does not crack or deform.

  FIG. 9B shows a state in which the piece 53 of wood is inserted through the wall surface 52 when the semi-dried cocoon 51 is semi-dry. This piece of wood 53 disappears by firing, and a natural hole corresponding to the piece of wood 53 is made in the trace. Although illustration is omitted, by making a large number of holes as described above, light spots or the like can be formed.

  FIG. 10 shows a semi-dried molded product 55 formed into a plate shape using the same kneaded material as in Example 5, and then engraved on its surface. FIG. 10A is a perspective view, and FIG. 10B is a sectional view taken along line XX in FIG. In addition, the hatching part in FIG.10 (b) is an excavation location.

  Although illustration is omitted, the kneaded material used in Example 5 was put in a mold, dried and fired to obtain a visit stone powder sintered body having a width of 120 cm, a length of 200 cm and a thickness of 7 cm. Similarly, a visiting stone powder sintered body having a width of 60 cm, a length of 200 cm and a thickness of 7 cm was obtained. This sintered body was mounted between a stone and a wire net inside a futon to obtain a fishing reef having a width of 120 cm, a height of 60 cm, and a length of 200 cm. This fishing reef was installed on the seabed at a depth of 3m.

  Similarly, although not shown in the drawings, 13% sawdust and 34% water were added to kneaded stone powder 52% used in Example 5 and kneaded. The obtained kneaded product was put into a mold, dried and fired to obtain a visit stone powder sintered body having a width of 40 cm, a height of 20 cm, and a thickness of 10 cm. This visiting stone powder sintered body had a specific gravity of 0.71 and a very light block. This block can be used favorably for a gardening partition or the like.

(A), (b), (c) is explanatory drawing which shows the process in which the coating material filler used as the origin of the carbide inclusion waiting stone powder sintered compact of this invention is manufactured. Example 1 These are the top views of the carbide inclusion waiting stone powder sintered compact of the state cut | disconnected by the XX thread of FIG.1 (c). Example 1 These are graphs showing a firing pattern. Example 1 These are the graphs which show the particle size accumulation curve of the visiting stone powder used in the present invention. FIG. 11 is a perspective view showing another mold. (Example 2) These are perspective views which show the other example of the carbide inclusion conventional waiting stone powder sintered compact. (Example 3) These are side views which show the usage example of the carbide inclusion waiting stone powder sintered compact of this invention. Example 4 These are side views which show the usage example of the carbide inclusion waiting stone powder sintered compact of this invention. Example 4 (A) is sectional drawing of the state which excavated and formed the shape of the cage | basket from the semi-dry molded object for other visiting stone powder sintered compacts of this invention. (B) is a front view of the semi-dry ridge 51. FIG. (Example 5) (A) is a perspective view of the semi-dry molding which gave the surface engraving 54, (b) is XX sectional drawing in Fig. (A). (Example 6)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carbide inclusion waiting stone powder sintered body 2 Paper tube 3 Coating material 4 Pipe 5 Thinning material 6 Sawdust 7 Coating material filling body 8 Metal net 9 Charcoal 10 Sintered body 11 Cavity 20 Punch 21 Punching metal 22 Frame body 23 Butterfly board 24 Stopper 30 Carbide inclusion waiting stone powder sintered body 31 Charcoal 40 Tanikawa 41 Valley stop material 42 River floor material 43 River 44 River revetment fence material 50 Semi-dry molding 51 Firewood semi-dry molding 52 Firewood wall 53 Wood piece 54 Sculpture 55 Semi-dry molding

Claims (9)

2. Gravel mixed sandy clay or gravel mixed silty clay containing more than 0% and less than 5% gravel less than 60 % , or gravelly soil containing more than 15% of gravel less than 2.60mm and less than 5mm. A visitor stone powder sintered body characterized in that a kneaded product of visitor stone powder having a particle size distribution and water is molded, dried, and then fired.   The visiting stone powder sintered body according to claim 1, wherein a secondary molded article obtained by subjecting a semi-dried molded article to engraving or engraving work having an arbitrary shape is dried and then fired.   The visiting stone powder sintered body according to claim 1 or 2, wherein the molded article is glazed and fired. 2. 10 to 40 parts by weight of water for 100 parts by weight of granite stone powder having a particle size distribution of gravel-mixed sandy clay and gravel-mixed silty clay containing more than 0% and less than 5% of gravel less than 60 % A method for producing a visitor stone powder sintered body, which is kneaded at a ratio of, put into a mold or molded without being put into a mold, dried and then fired. 2.Press molding of water kneaded at a ratio of 10 to 40 parts by weight with 100 parts by weight of granite stone powder having a particle size distribution of gravelly soil containing 15% or more of pebbles of 60 mm or more and 5 mm or less And drying, and then firing, a method for producing a visitor stone powder sintered body.   6. The method for producing a visitor stone powder sintered body according to claim 4 or 5, wherein a secondary molded product obtained by subjecting a semi-dried molded product to engraving or engraving with an arbitrary shape is dried and then fired.   The method for producing a visiting stone powder sintered body according to claim 4, 5 or 6, wherein the dried molded product is subjected to glazing, dried and then fired.   The method for producing a visitor stone powder sintered body according to claim 4, claim 5, claim 6, or claim 7, wherein the firing is performed at a temperature of 500C to 950C.   The method for producing a visitor stone powder sintered body according to claim 4, claim 5, claim 6, or claim 7, wherein the firing is performed at a temperature of 950 ° C to 1180 ° C.

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