JP3474376B2 - Powder manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for obtaining useful materials by effectively utilizing a large amount of scallop shells which are valueless and difficult to dispose of. About. In particular, the present invention relates to a powder that can be used for various uses such as various aggregates, artificial sand, and artificial soil. [0002] Scallops are bivalves distributed from the Tohoku region of Honshu to Hokkaido, the Sea of Okhotsk, the eastern shore of the Korean Peninsula, and Primorye. The scallops are large and extremely delicious.
It is widely favored both in the east and west of the ocean, and is important as a seafood export item. Scallop cultivation has been put into practical use since about 1965, and has been gradually improved, so that stable cultivation of more than 80,000 tons per year is now possible.
However, such a shelled shell of a large number of cultured scallops is typically 11 cm in diameter and up to 1 cm in diameter.
It is as large as 5 cm, and its disposal has become more difficult every year.
Here, attempts have been made to pulverize these shells into various aggregates or artificial sand. However, this crushing is extremely difficult, and such things have a bad smell,
Alternatively, it is difficult to handle due to having sharp fine corners, and has practically no value because it has few uses. SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned disadvantages of the prior art and to obtain powders useful as various industrial materials and working materials from scallop shells. [0004] The powder of the present invention is claimed in claim 1.
A scallop shell ground and heat-treated in an oxidizing atmosphere at 350 ° C. to 450 ° C. as described in, and has a scale-like shape and a length of 1 mm to 5 mm.
Below, width 0.3mm or more and 3mm or less, thickness 0.2mm
It is characterized in that it is not less than 1.2 mm and is preferably colored. [0005] In the powder of the present invention, the shell is first
It is necessary to heat treatment without. That is, if there is no heat treatment step and the product is simply pulverized, it may have a bad smell even if it is completely dried. Moreover Such may stimulate biological There is a fine angular, for example can not be applied, such as an artificial beach, also is difficult to obtain the intended homogeneous granular, very fine powder is generated in the grinding step Since it is easy to soar in the wind and the like, labor such as sieving was required. However, if the powder is pulverized after the above-mentioned heat treatment step, the pulverization is easy, and the obtained powder is scaly and has no corners. At the same time, since fine powder is not generated, labor such as sieving is not required. is there. In addition, 30 minutes to 2 hours are appropriate as the heat treatment time. If the time is less than 30 minutes, the subsequent pulverization may be difficult, and even if the treatment is performed for more than 2 hours, the effect is saturated, which is uneconomical. [0007] In the case of powder obtained by simply crushing scallop shells, when used as cultivation soil, it may result in the inhibition of plant growth, but when the powder according to the present invention is used as cultivation soil, Rather, the result is to promote plant growth. Although the detailed reason is unknown, the powder of the present invention is porous, so it retains moisture and fertilizer, and is supplied to plants for a long time, and a very small amount of calcium is released from the powder itself. It is thought to be due to the effects of the above. In the present invention, the heat treatment step is performed at 350 ° C.
Above is a good result. Ie 300 ° C
If it is less than the above range, subsequent pulverization is difficult, and the obtained powder also has sharp corners. It is to be noted that a heat treatment temperature exceeding 500 ° C. is not preferable because it becomes alkaline, irritates the living body and cannot be used as a general one as described above. If the heat treatment step is performed in an oxidizing atmosphere, vivid white powder is obtained. That is, such a good powder can be obtained by sufficiently bringing the shell into contact with air during the heat treatment step. [0010] scaly powder is obtained by trituration with conventional grinding means after the heat treatment. This powder is the colored part of the shell
Although a little color remains, almost all are bright white powders. At this time, the crushing conditions were examined, and the length was 1 mm or more and 5 m.
m or less, width 0.3 mm or more and 3 mm or less, thickness 0.2
When the thickness is not less than mm and not more than 1.2 mm, even when used as artificial sand or cultivated soil, it does not rise and is easy to handle. The weight of 100 grains at this time is 0.2 g to 0.1 g.
5 g. The powder thus obtained can be suitably used as various types of aggregates, artificial sands and artificial soils, but can be used as a decorative material by further coloring. At this time, an aqueous paint such as a synthetic dye or a synthetic paint can be used as the dye, and since these colors are irreversibly dyed, they are kept vivid even in an environment in contact with water. Such colored powders are used for the same applications as non-colored powders, and can also be used for applications such as decoration of flower beds and pot soil, marking on snow and various work materials such as children's work. . Further, the powder of the present invention is porous and releases calcium, so that it can be used as a water quality improving material or a soil improving material. Next, specific embodiments of the present invention will be described. The shell from which the cultured scallop from Hokkaido Funka Bay was removed was heated in an incinerator. At this time, heating was performed by opening an air supply hole so that oxygen was sufficiently supplied to the incinerator. Incidentally, when the temperature in the vicinity of shells in the furnace was measured by a thermocouple thermometer, it was around 350 ° C. to 450 ° C.. After 1 hour, the scallop shell was taken out , cooled to room temperature, divided by a hammer into about 1 cm square, and further ground with a commercially available manual coffee mill. The resulting powder is scaly, and its color remains slightly in the colored portion of the shell, but almost all is a bright white powder, most of which is 1 mm or more and 5 mm or less in length and 0.3 mm in width.
The thickness was not less than 3 mm and the thickness was not less than 0.2 mm and not more than 1.2 mm, and no fine powder was generated (hereinafter, referred to as “powder A”).
In addition, the weight of 100 particles of the powder A was 0.3 g. Also, the powder A has a shape is flake, not even irritation against the back of the hand, also because it is odorless, it is determined that it can be used as an artificial sand beach. [0014] on the potting soil of tulip of potted this powder A, to the extent sprayed potting soil can not be seen, then those that were cultivated under normal cultivation conditions, similar growth without spraying the powder
As compared with the tulip grown under the condition, the color of the flower that bloomed one month later was more brilliant when the powder A was used. At this time, the periphery of the bowl was observed, but no scattering of the powder was observed. From this, it was found that the powder A was suitable not only as a decorative material but also as a cultivation soil. Using the powder A as an aggregate similar to river sand, a cement pot was produced. This was white compared to the one produced using sand as an aggregate, and could be suitably used as a flowerpot for indoor interior vegetation even if it was uncolored. Also, when the strength of this product was dropped on a concrete floor and examined,
It turned out that it has almost the same strength as a flowerpot made using sand. [0016] On the other hand, colored with those of the powder A, it was mixed with 8% water Asahipen made aqueous coating Biffu 10. Powder after coloring (hereinafter referred to as "Powder B") is mostly in bright yellow, become yellow slightly only powder from colored portion of the shell grayish, it settled and you observe the entire powder yellow It turned out that it can also be used as a decorative material. The powder B was placed in water and allowed to stand for three days and nights. No discoloration was observed, and no elution of the paint into water was observed. Powder B, by using together with colored powder to the powder A or likewise other colors unpigmented, were those which can be used as various work materials such children work. In addition, as a marker on snow, it could be used for traffic sign applications, golf course applications, and the like. For comparison, a scallop shell similar to that used for preparing the powder A was pulverized with a hammer into a 1 cm square without heat treatment. At this time, the shell was extremely hard. Was difficult. Furthermore, I tried grinding with a manual coffee mill, but the handle did not turn,
Therefore, it was further ground with a hammer. This pulverization is difficult and extremely fine powder is generated in the process.Therefore, when the obtained powder is sieved to remove powder of 1 mm or less and observed with a magnifying glass, they have sharp corners. In addition, when strongly pressed against the back of the hand, strong irritation occurred, and it was determined that the sand could not be used as artificial sand on the beach. It had a peculiar off-flavor. The powder of the present invention is obtained from scallop shells, which have become difficult to dispose of, and has low irritation to the human body.
It is useful as various industrial materials and working materials.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-207173 (JP, A) JP-A-5-32968 (JP, A) JP-A-4-175222 (JP, A) JP-A-4-175 42810 (JP, A) JP-A-63-49230 (JP, A) JP-A-57-166358 (JP, A) JP-A-52-127914 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) C01F 11 / 04,11 / 06 C04B 18/04 C09K 17/06 A01G 1/00 F23G 7/00

Claims (1)

(57) [Claims] [Claim 1] Scallop shells are heated at 350 ° C. or higher to 450 ° C.
A method for producing a powder, comprising heat-treating in an oxidizing atmosphere up to ° C. and then pulverizing.