JP2009155198A - Method for dissolving shell and method for manufacturing detergent, disinfectant, adhesive and coating using the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for effectively dissolving quicklime powder or slaked lime powder of large particle size, and to provide a detergent, a disinfectant, an adhesive and a coating using a solution obtained by the method. <P>SOLUTION: A first method of adding an acid and water to quicklime powder or slaked lime powder and heating it, or a second method of firing shells and sprinkling water on the hot fired shells is adopted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for dissolving a shell and a detergent, a disinfectant, an adhesive, and a paint using a dissolved material (also referred to as a solution) obtained by the dissolution method as a raw material.

  In Japan, limestone is abundantly produced. Calcium carbonate products manufactured using this limestone are inexpensive, have high whiteness, are harmless, and produce products of various particle sizes. It is used in many fields as additives for body pigments, paper fillers, paper coat pigments, pharmaceuticals, foods, agricultural products, etc. In this calcium carbonate product, calcium carbonate having various particle size ranges is produced by mechanically pulverizing limestone and classifying the pulverized product.

On the other hand, shells of shellfish such as scallops and oysters are discarded in large quantities because they are not useful, but the main component of shells is calcium carbonate, and its effective use is desired. There is known a method of calcining scallop shells to obtain quick lime or slaked lime, and using this to produce calcium carbonate (see Patent Document 1 below).
JP 2005-170733 A

  Such calcium carbonate produced from limestone is generally produced using a grinding machine. For production reasons, it is possible to produce a product having a wide particle size distribution, a fine particle size, and a narrow particle size distribution. Can not. Therefore, at present, the calcium carbonate produced in this way cannot be used for advanced applications requiring a fine particle size and a narrow particle size distribution.

  Moreover, as described in Patent Document 1, various shells such as scallops are fired to obtain quick lime powder or slaked lime powder in the same manner as limestone produced from the soil. However, when the fired shell was pulverized by a general machine for pulverization, only a large particle size was obtained, which had the same problem as the limestone.

  That is, in order to dissolve the baked shells, it is necessary to make fine powder of about 300 to 500 mesh. However, such a fine powder cannot be obtained with a general machine such as a crusher for grinding. For such ultrafine pulverization, for example, if the daily production amount is 20 to 25 tons, billions of pulverization facilities are required, and this huge capital investment is added to the cost. It will not be possible to manufacture and sell the product.

  In this way, quick lime and slaked lime powder obtained from limestone, or quick lime and slaked lime powder obtained from shells, all can only be obtained with a relatively large particle size unless a huge capital investment is made. From these powders, no solution or slurry could be obtained.

  The present invention provides a method for effectively dissolving such coarse lime powder or slaked lime powder obtained from a shell, and also provides a detergent, a disinfectant, an adhesive, and a paint using the resulting solution. For the purpose.

In order to achieve the above object, according to the present invention, a step of firing a shell in a firing furnace, and
Removing the fired shell from the firing furnace and adding water to the high temperature fired shell;
A method for dissolving a shell is provided.
Moreover, according to this invention, the detergent, disinfectant, adhesive agent, and coating material using the solution obtained in this way are provided.

  According to the present invention, conventionally, fine lime powder or slaked lime powder having a fine particle size cannot be dissolved without enormous costs, whereas quick lime powder or slaked lime powder obtained from shells can be effectively used at low cost. Therefore, detergents, disinfectants, adhesives, paints, and the like can be produced at low cost using the solution. In addition, it is possible to effectively use shells that are discarded in large quantities.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing a method for dissolving quick lime powder or slaked lime powder according to a first embodiment of the present invention.
In FIG. 1, first, quick lime powder or slaked lime powder is prepared. As quicklime powder or slaked lime powder, limestone produced from soil or rocks may be pulverized, or shells may be pulverized by heating. As the shell, all kinds of shells can be used. For example, scallops, oysters, oysters, Akoya shells, clams, fools, red shells and the like can be used. Of these shellfish, those with high yield and easy availability are preferred, but scallops are natural and cultured, and the total has increased more than 2.5 times over the past 10 years. It is preferable to use as a raw material because it is easily available. In addition, the statistics in 2004 indicate that 200,000 tons of scallop shells are generated as waste in Hokkaido every year. The point that the waste can be effectively used is also an effect of the present invention. In addition, when a shell is baked at 1000 degreeC, quick lime can be obtained, but if water | moisture content is returned to this somewhat, it will become slaked lime (calcium hydroxide). In the first embodiment, both quick lime and slaked lime can be used as raw materials.

  In step S1 of FIG. 1, acid and water are added to quicklime powder or slaked lime powder. Specifically, these raw materials are put in a container such as glass. This quick lime powder or slaked lime powder may be obtained by pulverizing limestone, or may be obtained by firing a shell and then pulverizing it. When firing shells, the shells are fired at about 1000 ° C. in a firing electric furnace or a rotary kiln. The firing temperature may be as low as about 400 ° C. to 500 ° C. In that case, the finished quick lime powder or slaked lime powder is yellowish. When the baking temperature is 890 ° C. or higher, the finished quick lime powder or slaked lime powder is white, and such a high temperature is preferable depending on the purpose of use. In addition, since it burns with the calcination temperature of 950 degreeC or more, the organic substance adhering to a shell will be mineralized, and quick lime or slaked lime with high purity can be obtained, Therefore It is preferable that a calcination temperature is 950 degreeC or more. Since the particle size is about 3 mm to 5 mm at the stage of firing the shell, this is pulverized to a fine powder with a crusher to 250 mesh to 350 mesh.

  The acid added to quicklime or slaked lime is 2% by weight, and the amount of water added is 20 times. As the acid, citric acid, acetic acid and the like can be used. Specifically, 2 g of citric acid and 2000 cc of water are added to 100 g of quicklime or slaked lime. Thereafter, in step S2, stirring and mixing are performed to form a mixture. Next, in step S3, the mixture is heated and boiled, and when the water becomes about half, the heating is finished (step S4). In the case of the above amount, the heating time is about 40 minutes. In addition, although the quantity of the water in this example is 20 times the weight of quick lime or slaked lime, it is necessary to make it at least 10 times the weight of quick lime.

  By this heating, the solution becomes a jelly-like calcium hydroxide which becomes muddy. In the present invention, such a jelly or so-called slurry is also referred to as a solution or a solution. Acetic acid can also be used instead of citric acid. However, citric acid is preferred because acetic acid smells vinegar while citric acid is odorless. Although acids other than these, that is, hydrochloric acid and sulfuric acid can be used, attention must be paid to safety.

Next, a second embodiment of the present invention will be described. FIG. 2 is a flowchart showing a method for dissolving quicklime powder according to the second embodiment of the present invention.
In FIG. 2, the shell is first fired in step S11. The firing method and temperature are basically the same as those described in the first embodiment, but the firing temperature is about 1000 ° C. That is, the shell is placed in an electric furnace used as a firing furnace, the firing temperature is increased to about 1000 ° C., and firing is performed for 10 minutes. Next, in step S12, the fired shell is taken out from the electric furnace. In the second embodiment, unlike the first embodiment, it is not necessary to grind the fired shell. Although the temperature of the baked shell taken out from the electric furnace is around 900 ° C., water is sprayed on the shell in step S13 while maintaining a high temperature of at least 850 ° C. or higher. Since the sprayed water is heated rapidly, it boils vigorously, but a part of it penetrates into the shell, and the high-temperature baked shell with the sprayed water dissolves into a jelly. As an example of this embodiment, 100 cc of water is sprayed on 85 g of the shell having a product temperature of about 900 ° C. in a state where the shell fired at 1000 ° C. is taken out from the electric furnace. As water to be sprayed, other water such as ground water, spring water, filtered rain water and the like can be used, but tap water to which a disinfectant or the like is added is not preferable. In the experiment of the present inventor, even when ground water (well water) having a temperature of 2.5 ° C. is used, good results are obtained.

  In the above example, a jelly-like melt was produced, but the amount of water can be controlled by the final product to be produced. For example, when it is desired to produce a powdered soap product having a low water content, about 18% by weight of water is sprayed on the baked shell. On the other hand, in the case of producing a muddy jelly-like product, about 236% by weight of water is sprayed on the baked shell. In addition, when manufacturing the latter muddy jelly-like product, spraying the entire amount of water at one time may hinder boiling and may cause defective products. . When spraying in two steps, spray half of the water on the first and the remaining half on the second. The time interval between the first time and the second time is 10 to 15 seconds. Also, if the temperature of the baked shells decreases, the reaction with the sprayed water becomes dull and it becomes a rough semi-finished product, so it is possible to spray water with the baked shells kept at a high temperature as described above is necessary. That is, after removing the shell from the electric furnace, it is necessary to complete the entire water spraying process within 30 seconds, and it is particularly preferable to complete within 10 to 20 seconds.

  In the second embodiment, water is sprayed after the shell is taken out of the electric furnace, but water can be added to the shell by other methods without necessarily spraying. That is, as another method, the above-described predetermined amount of water may be put in a predetermined container in advance, and the high-temperature shell taken out from the electric furnace may be put therein.

  In the second embodiment, the shells after firing are in a rough state with a particle size of about 0.5 mm to 2.0 mm, but without using a pulverizer, it is possible to obtain a jelly-like product by spraying water. It is possible to dissolve. When observing this jelly-like product, it was more soluble than the product that was pulverized by investing a huge amount of equipment. Moreover, this product showed a strong alkalinity of PH 12.9. As described above, in the second embodiment, an expensive crushing facility for finely crushing the shell is unnecessary, and it is possible to greatly reduce the capital investment and reduce the manufacturing cost.

  In addition, the detergent for household washing machines was manufactured using the muddy jelly-like product manufactured in the second embodiment. That is, a higher alcohol detergent, 47 cc of sodium bicarbonate, and 3 cc of fluorescent agent were added to 950 cc of the muddy jelly-like product to obtain a total of 1000 cc of detergent. Using this detergent, commercially available household detergents, Lion Co., Ltd. Top (registered trademark), Kao Co., Ltd. Attack (registered trademark), DCM Co., Ltd. Super White, P & G Co., Ltd. hold A cleaning ability comparison test with the four products was conducted. In this comparative test, soy sauce, coffee, miso soup, sauce, tomato ketchup, and curry are attached to a predetermined cloth and stained beforehand, and each detergent is used in a household washing machine (for 5.6 kg). 30 liters, the amount of detergent used was the same as the amount specified by each manufacturer, and the washing time was 16 minutes. The detergent according to the present invention used 40 cc with respect to 30 liters of water. As a result, for soy sauce, miso soup, and tomato ketchup, it was confirmed that any detergent has the ability to completely remove dirt. For the sauce, the top (registered trademark) of Lion Co., Ltd. and the detergent according to the present invention completely removed the dirt, while the products of the other three companies did not completely remove the dirt. Only a certain degree of cleaning ability was observed. In addition, for coffee, all detergents were slightly soiled, and for curry, none of the detergents showed good cleaning ability. From this comparative test, it can be seen that the detergent according to the present invention has a cleaning ability that is more than that of many products in commercial detergents and is comparable to the one with the highest cleaning ability.

  In addition, since the dissolved product according to the present invention has been confirmed to have a bactericidal action and an adhesive ability, it can be used as a bactericidal agent in livestock farmers, an adhesive to be attached to the back side of wallpaper, or an extender pigment as a raw material of paint It can be used as such. Calcium carbonate produced from limestone is inexpensive and has high whiteness, so it is used in many fields as a filler for rubber and plastics, pigments for paints and inks, additives for pharmaceuticals, chemicals, and foods. However, the lysate of the present invention can be used as well.

  As described above, according to the present invention, it is possible to easily dissolve quick lime powder or slaked lime powder (including calcined shells) that could not be dissolved unless an expensive pulverizer is introduced. Since the present invention can easily produce detergents, disinfectants, adhesives, paints, etc., the present invention is not only useful for the production of various products using quick lime or slaked lime, but is also discarded in large quantities. It opens the way to the effective use of shells of shellfish such as scallops and scallops, and is useful in various industrial fields such as the manufacture of various chemicals, foods, pharmaceuticals, industrial products, etc., and waste treatment.

It is a flowchart which shows the melt | dissolution method of the quicklime powder or slaked lime powder concerning the 1st Embodiment of this invention. It is a flowchart which shows the melt | dissolution method of the quicklime powder concerning 2nd Embodiment of this invention.

Claims (10)

Placing the shell in a firing furnace and firing;
Removing the fired shell from the firing furnace and adding water to the high temperature fired shell;
A method for dissolving a shell.   The shell melting method according to claim 1, wherein a firing temperature in the firing step is about 1000 ° C.   The step of adding water is to spray water on the fired shell, and the spraying is performed twice for the first time and the second time, and the time between the first time and the second time is 10 seconds to 15 seconds. The method for dissolving a shell according to claim 1, wherein the time is seconds.   The method for dissolving a shell according to any one of claims 1 to 3, wherein the step of adding water is completed within 30 seconds after the fired shell is removed from the firing furnace. .   The method for dissolving a shell according to claim 1, wherein the step of adding water is completed within 10 to 20 seconds after the fired shell is taken out of the firing furnace.   The method for dissolving shells according to any one of claims 1 to 5, wherein the amount of water added in the step of adding water is about 100 cc with respect to 85 g of shells.   The detergent which uses as a raw material the solution of quicklime powder or slaked lime powder obtained by melt | dissolving by the method of any one of Claim 1 to 6, or a shell.   The disinfectant which uses as a raw material the solution of quicklime powder or slaked lime powder obtained by melt | dissolving by the method of any one of Claim 1 to 6.   The adhesive which uses the solution of quicklime powder or slaked lime powder obtained by melt | dissolving by the method of any one of Claim 1 to 6, or a shell as a raw material.   The coating material containing the extender pigment | dye which uses the solution of quicklime powder or slaked lime powder obtained by melt | dissolving by the method of any one of Claim 1 to 6, or a shell.

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