Chemistry: physical processes – Physical processes – Crystallization
Patent
1997-08-27
1999-11-16
Nguyen, Ngoc-Yen
Chemistry: physical processes
Physical processes
Crystallization
23295R, 4234994, 159 162, 159 45, C01D 306, A23L 1237
Patent
active
059849819
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a salt making method and apparatus, particularly a method and apparatus for making a natural salt.
BACKGROUND ART
It is known that common salt is made by depositing sodium chloride from sea water but, recently, natural salt, i.e., salt containing not only sodium chloride but also other sea water components such as minerals, has been attracted attention.
It is said that sea water contains almost the same components as those of human blood and, from this viewpoint, natural salt is considered preferred for human consumption.
As a result, the number of people who use natural salt for food is increasing and "salt application health method" in which a natural salt is applied to a human body and "salt bathing" in which a natural salt is added to bath water have been proposed, not only for health and cosmetic purposes but also as therapeutics of atopic dermatitis and so on.
As a method for making a natural salt, a method is known in which a crude salt, which is a kind of natural salt obtained by evaporating water from sea water by the heat of the sun, is dissolved in water and then heated at a temperature of 140 to 180.degree. C. for 6 to 12 hours.
The above method has the problems that the heating requires a large amount of energy and a large apparatus and the salt becomes unnatural by deviation of the components or removal of bittern, particularly magnesium and calcium.
The present invention, considering the above problems, has the object to provide a salt making method and apparatus which are simple in construction and can make a natural salt.
DISCLOSURE OF THE INVENTION
In accordance with the present invention, to solve the above problems, a starting salt-water mixture liquid is put in a vessel, into which a gas is blown to deposit the component salt of the starting salt. The component salt is salt which comprises common salt as the major component but may contain components other than the salt.
The starting salt which can be used is not particularly limited and natural salt, crude salt, rock salt and others may be preferably used. The "blown gas" is a gas such as air but the gas is not limited to air.
The starting salt-water mixture liquid of the present invention is usually prepared by mixing a starting salt in an amount more than the saturation and water in a mixer or the like to dissolve and finely disperse the starting salt in the water. However, a brine concentrated from a sea water may be also used. A brine having a concentration less than the saturation concentration can be theoretically used as the starting material.
The starting salts as mentioned above usually contain dust, etc. which should be removed. In the salt making method of the present invention, impurities such as dust are separated during the process of dissolution and dispersion of the starting salt and are separately deposited.
The efficiency of the above operations, particularly the dust removing operation, is higher when the amount of the starting salt-water mixture liquid is somewhat large. When the amount of the starting salt-water mixture liquid is large, however, the time required for salt making becomes longer. It is possible to shorten the time for salt making while effectively removing dust, by removing a portion of the starting salt-water mixture liquid from a bottom portion of the vessel while blowing a gas into the starting salt-water mixture liquid.
The starting salt-water mixture liquid may be prepared from a starting salt and water but, if bittern, etc. are added to a starting salt, the amount of dissolution of the starting salt in water is reduced and the component salt preferentially deposits before the bittern and, therefore, a starting salt-water mixture liquid containing a mixture of a starting salt and bittern, etc. may be used. When a mixture of a starting salt and bittern, etc. is used, a solution containing the bittern as a major component is removed by said removal so that the efficiency of the salt making is not reduced and the removed solution can be mixed
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Translation of JP 174974 (Application # 22-258) Mar. 1946.
Miyagi Showa
Nguyen Ngoc-Yen
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