TWI717148B - Method for removing stench and surface impurity of oyster shells - Google Patents

Abstract

The present invention relates to a method for removing stench and surface impurity of oyster shells, including the following steps: A. cleaning the oyster shells with water; B. preparing an organic acid solution with a concentration of 1% to 11%; C. heating the organic acid solution to 65℃ to 75℃; D. immersing the oyster shells in the organic acid solution for 3 to 5 minutes to remove the stench and surface impurity of the oyster shells; E. taking out the oyster shells and washing it with water to remove the residual acid from the surface of the oyster shells. Accordingly, the stench and the surface impurity are both removed, and the waste organic acid solution after treatment will not pollute the ecological environment.

Description

Method for removing peculiar smell and surface impurities of oyster shell

The present invention relates to a treatment method that can remove the peculiar smell and impurities of oyster shells without causing pollution to the ecological environment.

According to statistics, the weight of oyster shells produced in Taiwan each year is as high as 160,000 metric tons. Because the added value of oyster shells is not high, in the past, only a small amount was used in building materials, soil amendments or chicken and duck feed, and most of them were random piles. Abandoned, and the residual meat on the oyster shell is easy to breed mosquitoes and flies, and the foul smell caused by high temperature and sunshine, etc., will also cause environmental pollution. Therefore, if these discarded oyster shells can be further effectively used, it will not only solve the environmental protection problems caused by dumping of oyster shells, but also make its application scope wider and increase its added value.

Therefore, there is a patent case of Invention No. 1494270 "Method for Synthesizing Hydroxyapatite with Calcium-Containing Biological Waste Adding Plant Extracts" announced on August 1, 104 of the Republic of China, which discloses that the production steps include: a cleaning In the drying process, the calcium-containing biological waste is washed and then dried; a grinding process is to grind the dried calcium-containing biological waste into a calcium powder; a dissolution process is to add hydrochloric acid to the calcium powder to make the calcium powder Fully dissolve in hydrochloric acid and drop phosphoric acid to form a suspension; one addition process, add plant extracts to the suspension to form a mixed liquid, and control the particle size in the mixed liquid, then adjust the pH of the mixed liquid with ammonia , And mix the mixture uniformly; a reaction synthesis process, the aforementioned pH-adjusted and uniformly mixed mixture is washed with deionized water for a reaction time; a drying process, the aforementioned After cleaning, the mixed solution is dried to obtain hydroxyl apatite Stone powder. It mainly uses calcium-containing natural wastes (eg eggshells, oyster shells, etc.) as raw materials, and adds traces of natural plant extracts to make hydroxylapatite, which has good biocompatibility and passes through the The manufacturing process is simple, low-cost, and capable of mass production, so it has high added value.

There is also a new patent case No. M268197 "Oyster Shell Art Structure" announced on June 21, 1994, which disclosed that: the body structure of the figure body is first made of plastic and solid materials, and then it is matched with the oyster shell. The combination and configuration form an innovative artwork that has a unique image and space for imagination and can be copied in large quantities according to principles. In this way, the original useless oyster shells can be artistically and mass-produced, and artworks with unique images and imaginative spaces can be created, bringing marine art to a whole new level and style, and creating a local cultural industry. .

Because oyster shell is a material produced in nature, it is mainly composed of calcium carbonate as the main component and more than 20 kinds of trace elements. The basic structure of the oyster shell is divided into three layers: the outer layer is a very thin hardened protein stratum corneum; the middle is a calcareous fiber layer, a leaf-like structure and a prismatic layer with natural gas holes; the inner layer is a nacre layer, mainly composed of calcium carbonate It is composed of minerals and a small amount of organic matter. Because the oyster shell is a natural material, it is bound to be difficult to clean the oyster shell. For example, the thickness of each piece of oyster shell is different, and the surface roughness is different. The thinner part is easy to cause damage during the corrosion process. A condition in which holes are broken or dissolved due to excessive corrosion. Moreover, the original growth environment of oysters is the junction of sea water or brackish water, so impurities or some aquatic plants, microorganisms and impurities will adhere to the surface, which makes cleaning up more difficult. Moreover, once it is used in buildings or decorative arts, it will produce serious odors. Therefore, it takes a lot of manpower, material resources, time and money to carry out the pretreatment of oyster shells to remove the oyster shells before use. Odor and surface impurities, so there are many shortcomings in use.

In view of this, the current treatment of oyster shells and surface impurities has the above-mentioned shortcomings. Therefore, the present invention provides a method for removing the peculiar smell and surface impurities of oyster shells, including: washing oyster shells with clean water; configuring an organic acid solution with a concentration of 1% to 11%; heating the organic acid solution to 65°C to 75°C ℃; Immerse the oyster shell in the organic acid solution and soak for 3~5 minutes to remove the peculiar smell and surface impurities of the oyster shell; take out the oyster shell and rinse off the residual acid on the surface of the oyster shell with water .

The pH value of the clean water for cleaning the oyster shell is 7.

The concentration of the above organic acid solution is 6%.

The heating temperature of the organic acid solution is 70°C.

The oyster shell is soaked in the organic acid solution for 4 minutes.

Before the oyster shell is cleaned with clean water, the classification is performed according to the volume of the oyster shell.

In the above sorting, the oyster shells that are damaged in appearance are picked out at the same time, and the impurities, sand and foreign objects in the oyster shells are picked out.

The above 400 grams of the organic acid solution can treat 130 grams of the oyster shells.

The organic acid is one of citric acid, acetic acid, oxalic acid, malic acid, tartaric acid, succinic acid, lactic acid, or any combination thereof.

The above technical features have the following advantages:

1. Mainly use organic acid to treat surface impurities of oyster shells, such as citric acid, acetic acid or oxalic acid, etc., so the impurities on the surface of oyster shells can be completely removed to increase its aesthetics, especially to remove unpleasant odors. The oyster shell can be used in the creation of art works, or as a combination of wall heat dissipation structure.

2. Since organic acids are used in the whole process, and organic acids are natural acids that exist in nature and will not pollute the air, water sources and soil, so the damage to the ecological environment is quite small, and it will not cause environmental pollution.

3. It can effectively solve the environmental problems caused by the disposal of oyster shells, so as to solve the problem of oyster shell recycling.

1: oyster shell

2: Organic acid solution

3: container

4: heater

[The first figure] is an operation flowchart of an embodiment of the present invention.

[The second figure] is a simple schematic diagram of the operation processing of the embodiment of the present invention.

[Third Figure] is a photo of the oyster shells after removing surface impurities and odors with citric acid in an embodiment of the present invention.

[Fourth Figure] is a photo of oyster shells treated with acetic acid to remove surface impurities and odors in an embodiment of the present invention.

[Fifth Figure] is a photograph of oyster shells treated with oxalic acid to remove surface impurities and odors in an embodiment of the present invention.

Please refer to the first and second figures, the embodiment of the present invention includes the following operation steps:

A. Wash the oyster shells with clean water. Firstly, the collected oyster shells (1) are preliminarily sorted according to their size, and the oyster shells (1) that are damaged in appearance are picked out, and the impurities and mud in the oyster shells (1) are picked out. Sand and foreign objects are picked out, so as to retain the oyster shell (1) with a moderate size and good overall appearance. Then, the oyster shell (1) after sorting is cleaned with clean water, so that the oyster shell (1) can be cleaned before treatment, and the impurities, sand and foreign matter can be initially removed. The clear water is preferably neutral water with a pH of 7. The water volume and treatment time of the clean water are determined according to the number of the oyster shells (1).

B. Configure an organic acid solution with a concentration of 1% to 11%. An organic acid is added to pure water to prepare an organic acid solution with an optimal concentration of 6% (2). The organic acid is one of citric acid, acetic acid, oxalic acid, malic acid, tartaric acid, succinic acid, lactic acid, or any combination thereof.

C. Heat the organic acid solution to 65°C~75°C. Then the organic acid solution (2) is poured into a container (3), and the container (3) is heated by a heater (4), and the organic acid solution (2) is heated to 70°C. After the temperature, then keep the heating temperature within the above-mentioned temperature tolerance range.

D. Immerse the oyster shells in the organic acid solution and soak for 3 to 5 minutes to remove the peculiar smell and surface impurities of the oyster shells. Then put the cleaned oyster shell (1) into the container (3), so that the oyster shell (1) is immersed in the organic acid solution (2), and the immersion time is 4 minutes as the maximum good. The organic acid solution (2) can react with the calcium carbonate contained in the oyster shell (1), thereby removing the surface impurities of the oyster shell (1), and at the same time, removing the hardening of the outer layer of the oyster shell (2) Since the microorganisms attached to the protein stratum corneum are the main source of odor, the unpleasant odor on the oyster shell (1) can be removed after removing the microorganisms. If the number of oyster shells (1) is large, moderate agitation can be applied so that the organic acid solution (2) can fully contact and react with the oyster shells (1) to accelerate the removal of the oyster shells ( 1) Impurities on the surface and their peculiar smell. Another 400 grams of the organic acid solution (2) can process 130 grams of the oyster shell (1).

E. Take out the oyster shell and rinse the residual acid on the surface of the oyster shell with water. When the oyster shell (1) has been immersed in the organic acid solution (2) for 4 minutes, the oyster shell (1) is removed from the organic acid solution (2), and the oyster is immediately rinsed with clean water The organic acid solution (2) remaining on the surface of the shell (1).

In this way, the above steps can further remove impurities and unpleasant odors on the surface of the oyster shell (1). Moreover, most of the waste organic acid solution (2) after the treatment is the natural acid existing in nature, so the damage to the ecological environment is relatively small, and there will be no disadvantages of environmental pollution.

The present invention also uses different types of organic acids to conduct experiments. The experimental results are as follows. As shown in the third figure, it is an organic acid solution with a concentration of 6% with citric acid. The organic acid solution is heated to 70°C, and the oyster shells are immersed in the organic acid solution for 4 minutes. The obtained photo of the surface layer of the oyster shell. According to the photos, it can be observed that the surface of the oyster shell is quite clean, without any impurities, and without any peculiar smell, so the cleaning effect is the best.

As shown in the fourth figure, it is an organic acid solution with a concentration of 6% with acetic acid, then the organic acid solution is heated to 70°C, and then the oyster shells are immersed in the organic acid solution and soaked for 4 minutes. Photo of the surface layer of the oyster shell. According to the photos, it can be observed that there are a small amount of attachments on the surface of the oyster shell. However, it still has a cleaning effect on the surface of the oyster shell, and there is no residual odor, but there will be a little acetic acid smell.

As shown in the fifth figure, it is an organic acid solution with a concentration of 6% with oxalic acid, then the organic acid solution is heated to 70°C, and then the oyster shells are immersed in the organic acid solution and soaked for 4 minutes. Photo of the surface layer of the oyster shell. According to the photos, it can be observed that there are still a few attachments on the surface of the oyster shell, but there is no residual odor.

Through the above experiments, the present invention has confirmed that organic acids such as citric acid, acetic acid, and oxalic acid can clean and deodorize the surface of oyster shells under the same conditions of concentration, time and temperature. But the cleaning effect is slightly different. Among them, acetic acid has the worst effect. The smell of acetic acid will remain on the surface, but its own odor will be completely eliminated. Both oxalic acid and citric acid can completely eliminate the peculiar smell of oyster shells without leaving any peculiar smell. However, the above-mentioned various organic acids can achieve the effect of removing impurities and deodorizing on the surface of the oyster shell, so as to increase the beauty of the oyster shell, which can be used in the creation of art works or used as a wall heat dissipation. The combination of structure.

Based on the description of the above-mentioned embodiments, when one can fully understand the operation and use of the present invention and the effects of the present invention, the above-mentioned embodiments are only preferred embodiments of the present invention, and the implementation of the present invention cannot be limited by this. The scope, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the description of the invention, are all within the scope of the present invention.

Claims (8)

A method for removing the peculiar smell and surface impurities of oyster shells, including: washing the oyster shells with clean water; configuring an organic acid solution with a concentration of 1% to 11%, the organic acid being one of a citric acid, an oxalic acid, or Combine; heat the organic acid solution to 65°C~75°C; immerse the oyster shell in the organic acid solution and soak for 3 to 5 minutes to remove the peculiar smell and surface impurities of the oyster shell; take out the oyster shell, And rinse the residual acid on the surface of the oyster shell with clean water. The method for removing the peculiar smell and surface impurities of oyster shells according to claim 1, wherein the pH value of the clean water for washing the oyster shells is 7. The method for removing the peculiar smell of oyster shells and surface impurities as described in claim 1, wherein the concentration of the organic acid solution is 6%. The method for removing the peculiar smell of oyster shells and surface impurities as described in claim 1, wherein the heating temperature of the organic acid solution is 70°C. The method for removing peculiar smell and surface impurities of oyster shells according to claim 1, wherein the time for the oyster shells to soak in the organic acid solution is 4 minutes. The method for removing the peculiar smell and surface impurities of oyster shells according to claim 1, wherein, before the oyster shells are cleaned with clean water, the oyster shells are sorted according to the size of the oyster shells. The method for removing the peculiar smell and surface impurities of the oyster shell as described in claim 6, wherein the oyster shell that is damaged in appearance is picked out at the same time when the classification is carried out, and the impurities, sand and foreign matter in the oyster shell are picked out. Out. The method for removing peculiar smell and surface impurities of oyster shells as described in claim 1, wherein 400 grams of the organic acid solution can treat 130 grams of oyster shells.

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