JPH073263A - Soil improver of pulverized eggshell with good affinity to soil and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject soil improver with good soil affinity, drainage, water retaining property and properties for easy handling in bulk quantities, by burning, partially oxidizing and pulverizing egg shells. CONSTITUTION:The subject soil improver consists of the material which is obtained first by burning egg shells to remove organic components, together with oxidizing the part of them and then by pulverizing the resulting material. Further, this soil improver is favorably obtained by burning the egg shells in a rotary kiln at a temperature of 70-900 degree C for a resident period of 10-15min to remove organic components, and then pulvelizing them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil quality improving agent for a powdery egg shell material which is well compatible with soil, and a method for producing the same, and more specifically, to a soil familiarity agent using egg shells of chicken eggs used for various purposes. The present invention relates to a soil improvement agent for a good egg shell powder and a method for producing the same.

[0002]

2. Description of the Related Art Generally, an egg shell of a chicken egg is an inorganic coating layer that wraps the outside of the egg and has many pores, the surface of which is covered with a thin cuticle layer and is in contact with the lower surface of the inorganic coating layer. It consists of a membrane. Further, the thickness of the egg shell is 0.3 mm on average, the main component is an inorganic substance, and 95% or more of which is calcium carbonate. The skeleton of inorganic deposits is about 2% of the protein and a small amount of polysaccharides.

Eggs used 2.4 million tons in 1989,
About 10% of egg eggs, about 240,000 tons, of the eggshell is generated and discarded, but its usage is small, and it is mainly disposed of as industrial waste except crushed as it is to be used as feed.
Other than that, it is only used for some food additives.

For example, an anti-boiling agent for noodles disclosed in JP-B-57-31418, and JP-A-61-161.
Japanese Patent No. 47158 discloses a flour product dusting composition comprising a protein powder and an egg shell baked product, and JP-A-5-763.
No. 13, the egg shell is baked in an oven for several minutes, and this is 40
There is known a method in which a powdery substrate is pulverized to 0 mesh and various additives are added to the substrate to prepare a health food.

However, in these methods, the eggshell is baked,
In order to remove the organic components contained in the eggshell and to convert a part or all of the calcium carbonate in the eggshell to calcium oxide, the eggshell must be baked at a temperature of 600 to 1500 ° C. for 6 to 12 hours, and a large amount of eggshell should be removed. There is a problem in that the scale of equipment and the like needs to be increased in order to carry out the oxidation treatment, and it is desired to develop an application that can be easily and inexpensively treated and can be treated in a large amount.

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and specifically, it is suitable for the soil and familiarity obtained by firing egg shells to remove organic components and pulverizing them. The purpose of the present invention is to propose a soil improvement agent for a good egg shell powder and a method for producing the same.

[0007]

Means for Solving the Problems That is, the present invention is characterized in that at least a part of the eggshell is oxidized and powdered while the eggshell is baked to remove the organic component. Temperature 700 ~ by rotary kiln
It is characterized in that it is baked at 900 ° C. for a residence time of 10 to 15 minutes to remove the organic components contained in the egg shell and powderize.

The structure and the operation of the means of the present invention will be described in detail below.

The inventors of the present invention have investigated the use of a large amount of eggshell effectively. As a result, the egg shell, egg shell cuticle, eggshell membranes, proteins that constitute the skeleton by precipitation of minerals, etc. Since organic components such as polysaccharides remain, they are not well compatible with the soil even if they are crushed, and since they decompose during storage and cause a bad odor, they are washed at a relatively low temperature after being quickly washed after cleavage. For example 700-900 ° C
If the organic components constituting the shell of the eggshell are burned and removed by firing at the following temperature for a short time, a white powdery substance having a particle size of 300 μm or less is obtained without pulverizing using a pulverizing means. I found that I could do it.

Further, the powdery matter is used as a soil conditioner in an amount of 5 to 20% by weight, preferably 10 to 15% by weight, based on the acidic soil.
When added and cultivated plants, depending on the amount and physical properties of the soil conditioner, a normal use amount of about 5 to 20% by weight shows sufficient alkalinity and good drainage, and is effective as a soil conditioner. I understand.

The present invention has been completed based on the above findings. The configuration will be described in detail below.

First, the first invention of the present invention will be described.
The soil-improving agent of the present invention is a soil-improving agent which is obtained by firing egg shells in a rotary kiln and completely oxidizing them and pulverizing them without containing organic components. The calcium component of this soil conditioner is mainly composed of calcium carbonate, part of which is composed of calcium oxide, and the proportions thereof are such that the ratios of calcium carbonate and calcium oxide are 50 to 90% and 50 to 10%, respectively. It consists of things.

When this soil improver is added to the soil in an amount of about 5 to 20%, the soil changes from acidic to alkaline, and the drainage and water retention properties are improved, and if plants are grown with this soil improver. Good plant growth.

Next, the soil conditioner of the second invention will be described. After breaking the eggshell, the eggshell is baked in a rotary kiln under the baking conditions of a temperature of 700 to 900 ° C. and a residence time of 10 to 15 minutes so that the eggshell does not contain any organic component and is powdered.

According to the present invention, the organic components contained in the eggshell are completely removed and pulverized even though the organic component contained in the eggshell is baked in the rotary kiln at a relatively low temperature of about 700 ° C. Further, the calcium component of the egg shell powder is composed of calcium carbonate and calcium oxide, and the proportions thereof are about 50 to 90% and 50 to 10%, respectively, which is suitable as a soil conditioner. can get.

The present invention will be further described with reference to the following examples.

FIG. 1 is a process diagram of an apparatus used for carrying out the present invention. Reference numeral 1 is egg shell separation (divided into two pieces), 2 is a screw conveyor, 3 is a lateral feed screw conveyor,
4 is a screw conveyor, 5 is a rotary kiln, 6 is a shell, 7 is a screw conveyor, 8 is a shell receiving tank,
9 indicates cooling, 10 indicates a flexible container bag, and 11 indicates conveyance.

[0018]

[Example] From the eggshell separation step in which the egg was split into two pieces in the cleavage step and the contents were separated, a screw conveyor 2 was used.
The eggshells are carried out at a speed of 55 kg / min, and the eggshells are washed with water while being conveyed by the horizontal feed screw conveyor 3, and the washed products are supplied to the rotary kiln 5 by the screw conveyor 4. In this rotary kiln 5, the temperature is 750-8
After burning the shell 6 under the firing conditions of 50 ° C. and a residence time of 10 to 15 minutes, it is carried out by the screw conveyor 7 and put into the shell receiving tank 8. In this tank, after cooling 9 by air, it is put into a flexible container bag 10 and conveyed 11 to obtain a soil conditioner.

This soil conditioner is in a powder state (300 μm or less) without being crushed after firing, and is composed of calcium carbonate which is the main component of egg shell and a part of which is changed to calcium oxide, It does not contain any organic components.

This soil conditioner is added to artificially cultivated soil in an amount of 10 to 10.
When blended at 20%, drainage and water retention are good,
It showed an alkalinity of about pH 8.

[0021]

As described above in detail, the present invention is characterized in that the egg shell is made into a powder form by baking to remove organic components, and the egg shell is heated at a temperature of 700 to 700 by a rotary kiln. 900 ° C, residence time 10-15
It is obtained by calcination, burning, and removal of the organic components contained in the egg shell to form a powder.

In the present invention, baking is performed to the extent that there is no organic component supporting the skeleton of the eggshell. Therefore, the eggshell powder is not completely baked to calcium oxide, but the obtained eggshell powder is composed of calcium carbonate as the main component. It is composed of a part of calcium oxide and has a particle size of 300 μm or less, and exhibits an excellent effect as a soil conditioner.

[Brief description of drawings]

FIG. 1 is a process drawing showing an example of an apparatus used for carrying out the present invention.

[Explanation of symbols]

 1 Eggshell separation (divided into two) 2 Screw conveyor 3 Horizontal feed screw conveyor 4 Screw conveyor 5 Rotary kiln 6 Burning shell 7 Screw conveyor 8 Burning shell receiving tank 9 Cooling 10 Flexible container 11 Transport

Claims (2)

[Claims] 1. A soil improving agent for a powdery egg shell powder which is well compatible with soil, characterized in that the egg shell is burned to remove organic components and at least a part thereof is oxidized to be powdered. . 2. The eggshell is heated at a temperature of 70 by a rotary kiln.
Improve the soil quality of the egg shell powder, which is well compatible with the soil, characterized by being pulverized by baking at 0 to 900 ° C. for a residence time of 10 to 15 minutes to remove the organic components contained in the egg shell. Agent manufacturing method.