JP3761611B2 - Method for producing animal bone ceramics - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing animal bone ceramics made of bone powder of animal bones mainly composed of bones such as cows and horses.
[0002]
[Prior art]
It has been known that animal bones mainly composed of bones such as cows and horses exert an effect of neutralizing acidity by alkali ionization of calcium as a main component. Therefore, as a method of effectively using the main component, a flocculant that agglomerates septic organic substances in wastewater, or an active material that maintains its freshness by preventing oxidation of foods and food processing materials. The method of using as has already been proposed by the present inventors.
[0003]
In any case, in order to use animal bone as the aggregating agent or active material, it is necessary to first use animal bone as bone powder. This bone powder is produced by cutting live bones of animals to an appropriate size and then boiling, then crushing them once through a firing process in a firing furnace and a cooling process for natural cooling, and then applying them to a powder machine. It was something to do. And when manufacturing a flocculant from this bone powder, it was made into the flocculant by melt | dissolving bone powder in acids, such as a sulfuric acid, and when manufacturing an active material, it knead | mixed with the inorganic clay.
[0004]
[Problems to be solved by the invention]
However, when this bone meal is produced in the conventional manner, there are problems that it takes time and that the production cost is increased. In other words, the raw bone is boiled in order to remove fat and organic matter such as glue attached to the bone, but there are countless pores in the raw bone itself, so the raw bone remains cut. This is because it is necessary to boil for a considerable time in order to remove not only the outside of the bone but also the organic substances adhering in the pores by boiling. In this case, it is possible to boil the raw bone after cutting it as small as possible. However, since the raw bone is mainly composed of bones such as cows and horses, the bone itself is very hard before boiling. It is difficult to cut and is not very profitable.
In addition, since the bone has a certain degree of hardness even after boiling and natural cooling, it is one of the causes that it takes time to produce bone powder because it is crushed.
[0005]
While the present inventor has paid attention to such a problem, conventionally, it was decided to go through a firing process for completely removing organic substances from the boiled bone in a stage before producing bone meal, but without going through this firing process. When ceramics are manufactured by producing bone powder and firing and sintering the bone powder, the ceramics are extremely beneficial for other properties, including the fact that the alkaline strength does not depend on the firing temperature. As a result, the present invention has been completed.
[0006]
In order to solve the above-mentioned problems, the present invention provides an animal by boiling animal bones, freezing them in a freezer or a freezer with moisture remaining in the pores, and crushing the frozen animal bones after freezing. The present invention is characterized by a method for producing animal bone ceramics characterized in that bone powder is obtained, a binder is mixed with the animal bone powder, and fired.
[0007]
When boiling animal bones, it is more preferable to boil animal bones by mixing caesada or bone meal.
[0008]
The freezing temperature in the freezing step is preferably about minus 100 degrees to minus 40 degrees, and the time is preferably around 1 to 3 hours. In the above boiling step, it is preferable to boil caustic soda in an amount of 200 to 300 cc or bone powder in an amount of about 500 g to 1 kg with respect to 200 kg of raw bone.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The manufacturing method of the animal bone ceramics of this invention is demonstrated.
In order to produce the animal bone ceramics of the present invention (hereinafter simply referred to as “ceramics”), it is necessary to produce bone powder from animal bones. Therefore, first, the manufacturing process of this bone meal will be described.
[0010]
Bone used as a raw material for bone powder production is bones of animals such as cattle, horses, sheep, etc., mainly bones. Pigs, salmons, etc. have a lot of cartilage, and most of them are melted in the boiling process during production, so they are not suitable for use as raw materials.
[0011]
The raw bone is cut into a size that is easy to boil while being cut into an appropriate size.
Next, the raw bone is put into a pressure kettle (compression kettle) and boiled at about 200 to 400 ° C. for about 60 minutes under a pressure of about 5 atmospheres. This boiling step is a step for separating and removing organic substances such as glue, fat, and bone from the bone. By passing through this boiling step, organic substances adhering not only to the outside of the bone but also to the pores can be substantially separated and removed from the bone.
[0012]
In this boiling step, boiling is performed by applying a pressure of around 5 atm. Thereby, the separation action of the organic matter adhering to the bone can be promoted.
Moreover, when boiling, it is preferable to boil by mixing caustic soda or manufactured bone powder in the pressure kettle. In this way, the organic matter is easily saponified by the action of alkali such as caustic soda and potassium hydroxide, so that it can be easily dissolved in water, thereby facilitating the separation of the organic matter to facilitate removal from the bone, and further shortening the boiling time. Because it can. The amount of caustic soda or bone powder mixed in this case is preferably about 200 to 300 cc of caustic soda or about 500 g to 1 kg of bone powder per 200 kg of raw bone.
And it is preferable to pour water or hot water on the boiled bone to remove organic matter and other dirt.
[0013]
Subsequently, the boiled bone is kept in a freezer (freezer) as it is and frozen. This freezing step is a step for directly freezing the boiled bone, paying attention to the fact that the frozen bone is extremely brittle and easily pulverized.
The temperature during freezing is preferably about minus 100 degrees to minus 40 degrees, and the time is preferably around 1 to 3 hours.
[0014]
The boiled bone has the advantage of being easily frozen due to the large amount of moisture remaining in the pores, so the boiled bone should be left to dry more than necessary, except to wash it with water. However, it is preferable to freeze it as it is. This is because the time required for freezing can be shortened.
[0015]
Next, the bone after freezing is crushed into a rough shape using a hammer, and is further pulverized by a powder machine to obtain bone powder of about 20 to 200 mesh. When this bone meal is made from beef bone, a yield of about 40% by weight is obtained compared to raw bone. The particles are mainly composed of calcium (about 33% by weight), phosphorus (about 16.7%), barium (about 1.03%), sodium (about 0.76%), sulfur (about 0.64%) In addition, it consists of magnesium, potassium, chlorine, amine, iron, etc., and innumerable micropores exist in and out of the particles. When ionized, it is alkaline due to calcium, sodium and the like.
[0016]
The ceramic of this invention can be obtained by mix | blending a binder with the bone powder obtained through the above processes, baking and sintering it.
As the binder, zeolite powder made by baking inorganic clay for about 3 hours at around 600 ° C. and then made into a powder of around 200 to 500 mesh, soil powder (clay powder), kaolin, etc. having connectivity is used.
[0017]
Kneaded until about 60-90% bone powder (weight%, the same shall apply hereinafter) and about 10-40% of the above-mentioned connecting material and mixed with 20-30% water until the whole is uniform. This is put in a mold of an appropriate size and fired in a furnace. If the proportion of bone powder is remarkably less than 60%, the alkaline strength is impaired. Conversely, if it exceeds 90%, the ceramic obtained after firing tends to become brittle, so the above range is preferred.
[0018]
As firing conditions, the firing temperature can be about 900 ° C. to 1800 ° C., and the firing time can be about 60 minutes to 180 minutes. Thereby, ceramics from which some organic substances that can remain in the bone powder are completely removed can be obtained. If the firing temperature and firing time are outside the above ranges, the ceramic density and the fine pores of bone powder may not be maintained. Therefore, the firing temperature and firing time are preferably within the above ranges.
[0019]
This ceramic is not only excellent in wear resistance, corrosion resistance, mechanical properties, etc., but also has the following characteristics, such as ceramics used in conventional industrial applications, such as alumina ceramics. It is.
{Circle around (1)} The micropores are maintained regardless of the firing temperature when firing the bone powder, and remain maintained regardless of how many times it is fired again.
(2) Alkaline strength (PH value) hardly changes depending on the firing temperature and shows a constant value.
(3) Excellent heat absorption and heat dissipation.
(4) The ion exchange action is good.
(5) Little change in properties due to heat.
[0020]
Since this ceramic has such an effective characteristic, it can be used for various applications including a filter for waste water and oil, or a material for preventing the decay and oxidation of oil and food.

Claims (2)

  Boil the animal bones, freeze them in a freezer or freezer with moisture remaining in the pores, crush the frozen animal bones after freezing to obtain animal bone powder, and connect the animal bone powder to the binder A method for producing animal bone ceramics, comprising mixing and firing.   The method for producing animal bone ceramics according to claim 1, wherein when animal bone is boiled, the animal bone is boiled by mixing caesada or bone powder.