KR960000494B1 - Method for producing cement for seedlings - Google Patents

Abstract

The autoclaved lightweight concrete for water cultivation is produced by (a) mixing pitchstone spouted from volcano and quick lime from calcined calcium carbonate at 1,000 deg.C in the weight ratio of 1:1-4:1, (b) preparing calcium hydroxide and calcium silicate hydrate which swell 2-4 times by gelling at 60-90 deg.C, (c) curing the mixture at 160-180 deg.C for 24 hrs to give tobermorite and calcium silicate hydrate in an autoclave. The pitchstone used as silicate based material consists of 65 wt% silica, 10-20 wt% alumina, 0-2.5 wt% iron oxide, 2-5 wt% magnesia, 2-5 wt% sodium oxide, 1-4 wt% potassium oxide and 0-0.5 wt% titania, while its main crystalline phase being mordenite.

Description

Manufacturing Method of Lightweight Foam Concrete for Hydroponic Cultivation

1 is a view for explaining the growth state of the tubular environmental unit of the present invention.

2 is a view for explaining the growth state of the vertical environmental unit of the present invention.

* Explanation of symbols for main parts of the drawings

1: tube type environmental unit 2: crop

3: root 10: vertical environment unit

The present invention relates to a method for manufacturing light foam concrete for hydroponic cultivation, and more particularly, to a method for manufacturing light foam concrete (ALC: Autoclaved Lightweigt Concrete) capable of hydroponic cultivation using volcanic gushing rock (aka pitchstone). will be.

In general, a method of manufacturing lightweight foamed concrete, which is widely used, is made into a slurry state using silica sand, lime and cement as a main raw material, and foamed by injecting a foamable raw material, metal aluminum powder, into the mixture. After curing in the autoclave (auto clave) to manufacture lightweight foam concrete.

However, lightweight foamed concrete produced by the above process is generally widely used as a large building material, it is difficult to use for small hydroponic cultivation.

Most of the environmental units used in conventional hydroponic cultivation are floated multi-process plastic panels such as urethane foam in the tank, and then the crops are grown on the panel, so that the farming area and multi-layer cultivation will be restricted. In addition, there are problems that are vulnerable to waterborne pests.

Therefore, the present invention has been invented to solve such a conventional problem, using a lightweight concrete prepared by hydrothermal synthesis of the pine rock as a raw material, very good affinity with the roots of the crop and a constant state of supply of moisture It is an object of the present invention to provide a method for producing light concrete for hydroponic cultivation in which crop growth is stable.

In order to achieve the object as described above, in the present invention, unlike the already generalized manufacturing method, the use of the Songji rock containing the components shown in Table 1 in place of the silica sand as the siliceous raw material instead of the metal aluminum powder as the foamable raw material After mixing the quicklime, which is a raw material of lime, in a weight ratio, and then gelling the mixture in hot water (60-90 ° C. water), at this time, the pine rock reacts with hot lime in hot water and utilizes the property of swelling. In order to make the final material lighter and to give high strength to the swollen sample, it is cured in autoclave to manufacture lightweight foamed concrete used as environmental unit for hydroponic cultivation.

TABLE 1

Chemical Composition of Songji Rock (Unit: wt%)

The present invention will be described in more detail with reference to the following Examples.

Example 1

Example 1 was mixed with the raw material Songjiam and quicklime in a weight ratio of 1: 1, 2: 1, 3: 1 and 4: 1 respectively, while maintaining sufficient water at a total amount of the mixed raw material at 90 ℃ 2 hours It was gelled by stirring for a while.

The pine rock was crushed with a coarse grinder and then pulverized again by wet in a ball mill to obtain a Blaine specific surface area of 3500-5000 cm ² / g, and quicklime was used for reagent grade or industrial CaCo ₃ Calcined at 1000 ° C. for 4 hours to use.

When the mixture is gelled, the raw material is slowly stirred so that the raw material does not settle, and the amount of water evaporated during the gelation process is frequently supplemented with hot water.

In order to provide crops as environmental units that can be hydroponicly grown using gelled samples, they are formed into a plate or tube shape according to the intended use. In the case of plate shape, the gelled sample is formed by a press. In the gelled sample was mixed with water again to make a slurry concentration of 25-30wt%, and then put into a gypsum mold of a constant size was produced by slipcasting (slipcasting) to form a molded body of about 10-20mm thickness, The molded product thus stored is stored in moisture and cured at 180 ° C. for 24 hours in an autoclave to complete a hydroponic cultivation environment unit made of lightweight foamed concrete.

The samples thus prepared were dried in a dryer at 60-70 ° C., and then examined for physical properties by weight ratio. As a result, as shown in Table 2, the swelling degree and water absorption were the best when the weight ratio of Songji rock and quicklime was 3: 1. Although the specific gravity is low, in the case of the bending strength, it can be seen to be better when the ratio is 2: 1.

TABLE 2

Test result according to the weight ratio of pine rock

Example 2

Example 2 was mixed with the Songji rock and quicklime in a weight ratio of 2: 1 to change the gelation temperature to 60 ℃, 70 ℃, 80 ℃, and 90 ℃ stirred for 2 hours, and then at 180 ℃ 24 hours in an autoclave It is curing to manufacture lightweight foam concrete, an environmental unit for hydroponic cultivation.

The detailed manufacturing process is the same as that performed in Example 1, and the physical properties of the prepared sample are the best when the gelation temperature is 80 ° C as shown in Table 3, but the swelling degree is the best, but the volume specific gravity and the bending strength are gelled. As temperature increased, the water absorption and porosity increased with increasing gelation temperature.

TABLE 3

Example 3

Example 3 is the environment unit for hydroponic cultivation by mixing Songji rock and quicklime in a weight ratio of 2: 1, maintaining the gelation temperature at 90 ℃ and changing the gelation time to 0 hours, 1 hour, 2 hours 4 hours and 8 hours, respectively It is to manufacture lightweight foam concrete.

The detailed manufacturing process is the same as that in Example 1, and the physical properties of the prepared sample are as shown in Table 4, and the swelling degree is best when the gelation time is 1 hour, but the volume specific gravity is increased by the gelation time. As the tendency decreased, the bending strength was the highest at 2 hours, and the absorption and porosity were the highest at the gelation time of 8 hours.

TABLE 4

Test result according to the change of gelation time

Example 4

Example 4 mixes the Songji rock and quicklime in a weight ratio of 2: 1, maintains the gelation temperature at 90 ℃ and after the formation for 2 hours, the curing temperature in the autoclave to 160 ℃, 170 ℃, and 180 ℃, respectively The change is maintained for 24 hours to manufacture lightweight foam concrete, an environmental unit for hydroponic cultivation.

The detailed manufacturing process is the same as that performed in Example 1, and the physical properties of the prepared sample are the lowest in specific gravity when the curing temperature is 180 ℃ as shown in Table 5, the bending strength is curing The temperature tended to decrease with increasing temperature, and the absorption rate decreased with increasing curing temperature, but the porosity was the best when curing temperature was 170 ℃.

TABLE 5

Test result according to curing temperature

The accompanying drawings show an example in which the lightweight foamed concrete prepared in the above embodiment is manufactured and used as an environmental unit for hydroponic cultivation of fabrics, and FIG. 1 shows an example used as a tubular environmental unit. 2 shows an example used vertically.

In the conventional hydroponic cultivation method, the roots of crops are submerged in water, but the lightweight foamed concrete manufactured by the present invention is a tubular environmental unit 1 or a vertical environmental unit 10 as shown in FIGS. 1 and 2. As the roots 3 of the fabric 2 extend outwardly to make contact with the air to provide sufficient breathing of the roots, it is not convenient to examine the influence of dissolved oxygen in water as compared to the conventional hydroponic method. In conventional hydroponic cultivation, the bottle spreads to the adjacent fabric by water immediately when the bottle is rooted, and the entire fabric is wiped out. However, the environmental unit of the present invention is a case where one fabric is spread to the adjacent fabric even if the bottle is contained. Is rare.

Since the present invention as described above is made of lightweight foam concrete, it is light but excellent in water absorption and porosity, so it is possible to control moisture, and cultivation of rice that requires a lot of water, including simple cultivation of water-sensitive eggs, due to its simplicity. There is an effect that can be used to grow a wide range of crops.

Claims (2)

Calcined limestone obtained by calcining volcanic eruptions and CaCo ₃ (reagents, industrial raw materials) in a weight ratio of 1: 1-4: 1, gelled at a temperature of 60-90 ° C, swelling 2-4 times A method for producing light-weight foamed concrete for hydroponic cultivation by curing a sample of calcium hydroxide and calcium silicate hydrate having a cured to 160-180 ℃ to produce tomobolite and calcium silicate hydrate. The method of claim 1, wherein the rosin is a composition SiO ₂ , content of 65-75wt%. Al ₂ O ₃ is 10-20wt%, Fe ₂ O ₃ is 0-2.5wt%, CaO is 1-4wt%, MgO is 2-5wt%, Na ₂ O is 2-5wt%, K ₂ O is 1 - A method for producing lightweight foamed concrete for hydroponic cultivation, characterized by using as a siliceous raw material a pineal rock having 4wt% and 0-0.5wt% of TiO ₂ and a main crystal phase of mordenite.