JPH07142A - Processed common salt - Google Patents

Abstract

PURPOSE:To obtain processed common salt, readily broken due to fine reticulated cracks possessed on the surface and the interior of grains of cubic common salt and good in adhesion, solubility, etc. CONSTITUTION:This processed common salt has better characteristics such as breakableness, adhesion and solubility than those of cubic common salt, molten salt and roasted salt by holding fine reticulated cracks on the surface and in the interior of cubic common salt grains. The processed common salt of this invention can be obtained by a simple method for heating the cubic common salt at a temperature of 400 deg.C to the melting point or below until the equilibrium attains and then quenching the heated common salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processed salt which is easy to be broken and has good adhesiveness and solubility by having cubic mesh salt on the surface and inside of particles.

[0002]

2. Description of the Related Art Conventionally, cubic salt is used as a salt having cracks on the surface and inside of particles, such as rock salt, sun salt, and rice salt with multi-effect evaporation can.
Known are molten salt and roasted salt that have been left to cool. Molten salt is refined rock salt and has been used mainly as salt in Europe. Regarding its manufacturing method, as described in “Sea Salt Chemistry” edited by the Japan Society for Sea Water, 1979, page 279, rock salt is heated to 820 to 850 ° C. and once melted to form sulfate, chloride, silicic acid. After separating impurities such as salt, it is made to flow into a salt-making device with a fixed stirring blade in a rotatable bucket, and the rotation speed is changed to make salt with various particle sizes. The molten salt is gradually cooled in the atmosphere, reaches 400 to 500 ° C. in about 10 minutes, and becomes white. Generally, crystals are easily broken parallel to a specific plane, which is called cleavage. In a cubic system like salt, Miller index (100) is a cleavage plane. The molten salt produced as described above has a relatively slow cooling rate of around 1 ° C / sec because it is cooled in the atmosphere, so the crystal has cracks, but the cleavage surface inside the crystal has a fine mesh-like shape. It has not reached the point where it cracks. Roasted salt has long been used as a method for improving the stickiness of salt. Since magnesium chloride contained as one component of salt has deliquescent properties, it absorbs water in the air and causes salt to become sticky. By burning the salt, the magnesium chloride contained in the salt changes to basic magnesium chloride and magnesium oxide, and the salt becomes a dry state (hereinafter referred to as "smoothness"). Conventionally, the temperature for firing to salt is 250 ° C. or lower, and cooling treatment in the atmosphere has been performed. However, since magnesium chloride is not completely converted to magnesium oxide, it is kept in the atmosphere over time. It had a drawback that it absorbs water and loses its dryness. As a method for improving this, the method for producing a baked salt described in Japanese Patent Application Laid-Open No. 3-257015 is a method in which a Mg salt content of 0.05% by weight or more is used.
It is characterized by being fired at ˜700 ° C. It is described that when calcined under these conditions, magnesium chloride contained in sodium chloride is changed to magnesium oxide and the smoothness is improved. Although there is no detailed description of cooling after firing, since the water content of the baked salt obtained in the examples is 1% by weight or less, it is considered to be cooling in the atmosphere, so the cooling rate is lower than that of the molten salt. There are less cracks than the molten salt of. In addition, there is a granular salt having characteristics similar to the processed salt of the present invention such as solubility, adhesiveness, and compressive fracture strength. The granular salt can be obtained by adding a binder such as a polysaccharide to a fine salt obtained by crushing common salt, mixing the mixture to obtain an appropriate granular form, and then drying. The granular salt is formed by a binder as an aggregate of single crystals and not microcrystals.

[0003]

The conventional salt based on cubic crystals, which is transparent and has no irregularities on the surface, requires a large force to be crushed, and it is difficult to attach other substances to the crystal surface. In that regard, it is not a very good material. The present invention has such drawbacks while maintaining the shape of particles.
Moreover, it provides processed salt that is not easily crushed by conventional salt and is easily crushed and has good adhesiveness and solubility.

[0004]

The processed salt of the present invention can be obtained by a simple method in which cubic salt is heated at a temperature of 400 ° C. to a melting point to equilibrium and then rapidly cooled.
The salt particles thus obtained diffusely reflect light and appear cloudy white. When these particles were dyed with a dye and observed with a microscope, it was found that the dye had penetrated into the inside of the crystal. When the surface of the particles was observed with a scanning electron microscope, the irregularities on the particle surface showed that conventional cubic salt and molten salt. It can be seen that the difference is clearly different from that of roasted salt. As described above, the processed salt of the present invention has fine mesh-like cracks on the surface and inside of the particles, and therefore shows different characteristics from the conventional cubic salt, molten salt and roasted salt when compared with the same particle size. For example, in order to improve the processability of raw salt,
Mechanical crushing such as crushers and mills is performed, but the energy required for crushing is large and the efficiency is extremely poor. Since the processed salt of the present invention has fine mesh-like cracks in the particles as shown in the examples, it has a characteristic that the particle diameter can be uniformly and efficiently crushed even if the energy is low. As the raw material of the processed salt of the present invention, rock salt, sun salt, sengo salt obtained in a multi-effect evaporator, and the like can be used. Cubic salt is the basic form,
It can be applied to spherical salt with sharp corners and crushed salt. The coefficient of linear expansion of a salt crystal is about 4 × 10 ↑ −5, which is relatively large. When the raw material salt is heated and rapidly cooled, strain occurs in the crystal during contraction and cracks occur at the cleavage plane. Moreover, the shrinkage strain is further increased by the impurities in the raw salt. The content of contaminants varies depending on the manufacturing method. The forms of existence are those attached to the surface of the crystal, those contained inside the crystal,
Some are contained in the crystal gaps in between. This contaminant is derived from the mother liquor contained in the crystal during the growth process (hereinafter referred to as the liquid bubble), the mother liquor adhering to the surface of the crystal, crystals of calcium chloride, magnesium chloride, calcium sulfate, etc., and other clay particles and bubbles. Become. When salt containing a lot of contaminants is heated, liquid bubbles and air bubbles may rupture, and some crystals may be broken without maintaining the original crystal shape. However, fine mesh-like cracks also exist in the crushed salt. To do. The present invention makes it possible to obtain a processed salt in which properties such as destructiveness, solubility and adhesiveness are changed by selecting a temperature, a particle defect, and a cooling method that give an appropriate thermal strain. As a cooling method,
The thermal strain should be maximized, in other words, the temperature change should be as large as possible and it should be carried out in a short time. For example,
Pour into a thermally stable solution such as water, saline solution, or saline solution containing magnesium salt. By using the solution for cooling, the impurities contained in the raw material salt are dissolved or washed by the solution that has permeated the infinitesimal fine cracks inside the crystal, which has the effect of increasing the purity, and conversely the other components. It can also be permeated and given. The heating temperature may be selected for the same reason, but is preferably 400 to 750 ° C.
If the particle mystery is too small, the shrinkage strain will be small, so 40
It is preferably 0 μm or more. Since the processed salt of the present invention has fine mesh cracks on the surface and inside of the particle,
Compared to conventional cubic salt, molten salt, and roasted salt, the compressive fracture strength is extremely small and the material is crushed uniformly, and the gap space due to cracks inside the crystal and the rough surface state of the crystal give good adhesion and a good dissolution rate. Due to its fast characteristics, it can be used individually or in combination with other substances. For example, compound food seasonings, bath agents, massage salts, etc., combined processing fields, salting, pickles, brewing, etc. However, it can be used.

[0005]

When cubic sodium chloride is heated to a temperature of 400 ° C. or lower and then rapidly cooled, shrinkage strain occurs, and numerous fine mesh-like cracks are formed on the surface and inside of the sodium chloride particles.

[0006]

EXAMPLES Examples of the present invention will be shown below together with the manufacturing method and the measurement results of the characteristics, but the present invention is not limited thereto. Nominal size of JIS sieve for raw salt is 1
Sift with 000 μm sieve and 1190 μm sieve,
1 kg of salt collected on a 1000 μm sieve and under a 1190 μm sieve is put in a magnetic crucible. This was placed in a Yamato muffle furnace, heated at 700 ° C. for 30 minutes, and poured into about 5 L of a saturated saline solution at room temperature. The temperature of this saturated saline solution reached 55 ° C. after 1 minute. This is -100mmHg
It was suction-filtered with a Nutsche for 30 minutes to obtain the processed salt of the present invention. Using the above-mentioned salt of the present invention, the following characteristic tests were conducted. For comparison, the same test was performed on the salt that had been heated in the muffle furnace of the above example and then cooled in the atmosphere instead of cooling with saturated saline and the raw salt used in the example. A. Compressive Fracture Strength Test (1) Kind of Salt (a) Raw Salt Used in Examples (b) Salt that was internally cooled in the manufacturing method of Example in the atmosphere (c) Processed Salt of the Invention (2) Test Method From the above salt, salt crystals were arbitrarily picked up one by one, and the maximum breaking strength during compression was measured using a digital load cell manufactured by Imada Seisakusho. (3) Results The results are shown in Table 1. The processed salt of the present invention was tested at a risk rate of 1%, and as a result, it was clear that the processed salt had a compressive rupture strength smaller than that of the raw material salt and the air-cooled salt, and was a salt different from roasted salt or molten salt. is there. Further, the δ of the processed salt of the present invention was significant as a result of being tested with the δ of the raw material salt and the air-cooled salt at a risk rate of 5%, so that the processed salt of the present invention is likely to be uniformly crushed. It is shown that. B. Equilibrium Adhesion Moisture Test (1) Salt Type Same as A test. (2) Test method A 40A pipe made of PVC of JIS10K has a length of 400 m.
The sample was cut into m, and a hole for sampling was drilled at a position of 270 mm from the lower part, with a diameter of 20 mm. The salt was adjusted to have a water content of about 5% and filled in an amount of 500 g in a cylinder having a rubber stopper at the bottom of the cylinder and a sampling hole, and the top was sealed with a rubber stopper. The salt layer had a height of about 300 mm. This tube was placed vertically and left standing for 12 days, and the water content of salt at a position 250 mm from the bottom of the salt layer was measured. Moisture measurement, the temperature is 140 ℃
A fixed amount of salt was put into the electric constant temperature dryer adjusted to, dried for 90 minutes, and the loss on drying of the salt was measured, and this was used as water. (3) Results The results are shown in Table 2. Most of the water content of the salt exists in the state where it adheres to the crystal surface, and if it is left unattended, the water content that cannot be retained falls to the lower layer and reaches an equilibrium state. This was defined as the equilibrium attached water content. The equilibrium adhering water content of the processed salt of the present invention is obviously higher than that of the raw material salt and air-cooled salt. There is almost no difference between raw salt and air-cooled salt. The processed salt of the present invention has a large number of cracks in the crystal, and since water is stably contained therein, the water content is high. On the other hand, although the air-cooled salt had some cracks, it did not contain enough water to hold the water stably, so the water content was the same as the raw salt. C. Micrograph (1) Type of salt Same as the test of A. (2) Test method Salt was dyed with a 1% by weight solution of crystal violet in methanol for 1 minute, and a microscopic photograph of a head magnified 40 times was taken. Further, a photograph of salt was enlarged 60 times with a scanning electron microscope. (3) Results The results are shown in Figures 1, 2, 3, 4, 5, and 6. Figures 1, 2,
Reference numeral 3 is a photograph of the raw salt, air-cooled salt, and the processed salt of the present invention, which were dyed and magnified 40 times with a microscope. Little dyed. On the other hand, in the processed salt of the present invention, it can be seen that the dye permeates the inside of the crystal to form fine mesh-like cracks. 4, 5 and 6
Photographs of raw salt, air-cooled salt, and processed salt of the present invention magnified 60 times with a scanning electron microscope. The raw salt and air-cooled salt have relatively simple shapes with no irregularities on the crystal surface. Are doing On the other hand, the processed salt of the present invention has a complicated shape with many irregularities on the crystal surface, and it is clear that the surface shape is obviously different. D. Dissolution test (1) Kind of salt Same as the test of A. (2) Test method In an electric constant temperature water bath adjusted to 20 ° C., 80 ml of pure water was placed in a 100 ml beaker, 20 g of salt was added with stirring, and the time until the salt was completely dissolved was measured. Rotation speed of stirring is 100 rpm, 300 rpm, 500 rp
The position of the stirrer was 2.5 cm from the bottom. (3) Results The results are shown in Table 3. The processed salt of the present invention had better solubility than the raw salt and the air-cooled salt.

[0007]

INDUSTRIAL APPLICABILITY According to the present invention, cubic salt has a fine mesh-like crack on the surface and inside of the particles, so that it can be easily broken and can be processed salt having good adhesion and solubility.

[Brief description of the figure]

FIG. 1 is a 40 × photomicrograph of raw salt.

FIG. 2 is a 40 × photomicrograph of air-cooled salt.

FIG. 3 is a 40 × photomicrograph of the processed salt of the present invention.

FIG. 4 is a 60 × scanning electron micrograph of raw salt.

FIG. 5 is a 60 × scanning electron micrograph of air-cooled salt.

FIG. 6 is a 60 × scanning electron micrograph of the processed salt of the present invention.

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[Procedure amendment]

[Submission date] May 30, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

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[Brief description of drawings]

FIG. 1 is a 40 × micrograph showing the grain structure of crystals of raw salt.

FIG. 2 is a 40 × micrograph showing the particle structure of crystals of air-cooled common salt.

FIG. 3 shows a grain structure of crystals of processed salt of the present invention.
It is a magnification micrograph.

FIG. 4 is a 60 × scanning electron micrograph showing the particle structure of crystals of raw salt.

FIG. 5 is a 60 × scanning electron micrograph showing the grain structure of crystals of air-cooled common salt.

FIG. 6 is a 60 × scanning electron micrograph showing the crystal structure of the processed salt of the present invention.

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Claims (1)

[Claims] 1. A processed salt which is a cubic salt salt and has mesh-like cracks on the surface and inner surface of the particles.