JP2002173322A - Method for manufacturing salt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing natural salt from seawater at a low cost on a large scale without missing mineral content. SOLUTION: This salt manufacturing method is carried out by using an apparatus comprising a seawater taking-in port, an evaporation basin for making the salt concentration of the taken-in seawater denser step by step, a tank for temporarily storing the brine concentrated in the evaporation basin, a unit for filtering/purifying the brine, a heating system for heating the brine to obtain crystalline salt, a system for removing the moisture content of the crystalline salt to dry it furthermore, a packaging system and a shipping storehouse for storing the packed salt. A sheet made from a synthetic resin like polyvinyl chloride is laid on the whole inside of the evaporation basin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing an alkaline salt using natural seawater.

[0002]

2. Description of the Related Art In general, rock salt is produced in large amounts in natural salt,
It is also dissolved in salt lakes and salt wells. After excavating this rock salt, water is injected, dissolved and pumped up as salt water, or it is boiled and collected as re-produced salt. In the case of salt lake, salt water is crystallized in the sun to produce salt. Further, since seawater contains a salt content of about 3%, salt is produced by the solar salt method when seawater is used as a raw material. .

[0003] A general method of the solar salt production method is to produce salt by evaporating seawater with sunlight. A shallow pond whose bottom is solidified with clay is formed, and seawater concentrated with sunlight from one side is sequentially formed. It is a method of making salt crystals as a product in a crystal pond at the end.

[0004] However, this method is not suitable for mass production, and has the drawback of increasing labor costs. Therefore, a method of producing salt by condensing seawater by heating with fire is used. However, such a method is required to evaporate seawater salinity of about 1 to 2 ゜ to 25 ゜ with gas or oil. There is a serious problem of unnecessary waste of energy because it is not necessary.

[0005]

Accordingly, the present invention has been reviewed for natural salt of seawater which is rich in minerals such as magnesium, potassium, fluorine, iron, sulfur, calcium and the like, and the demand for the salt is increasing. In view of the above, it is an object of the present invention to propose a method that can efficiently and mass-produce these minerals without escaping and provide them at low cost.

[0006]

The features of the invention are as follows: a seawater intake; an evaporating pond configured to gradually increase the concentration of the introduced seawater; and an evaporating pond concentrated in the evaporating pond. A tank for temporarily storing the brine, a configuration for filtering and purifying the brine, a heating system for heating the brine to a crystalline state, and a system for further removing water in the crystalline salt body And gradually increasing the concentration of seawater introduced into the pond in the evaporation pond, and then temporarily storing the brine produced, purifying the brine by further filtration, and further purifying the brine. Is dehydrated and heated to a crystalline state to further remove water from the salt body in this crystalline state.In particular, a synthetic resin sheet such as vinyl chloride is laid over the entire inner surface of the evaporating pond. It is.

Further, the present invention has many other excellent features, functions and effects, which will be clarified by the embodiments and the effects described below.

[0008]

Embodiment 1 FIG. 1 shows an example in which one evaporation pond is provided. (1) shows seawater, and (2) shows a breakwater. (3) is a seawater intake provided, for example, above a breakwater and normally closed by a valve (5) such as a wooden plug. (4) is a valve (5) of the intake (3). The seawater evaporating basin, in which seawater falls from the outer outlet when opened, has an inner wall covered with a synthetic resin sheet (14) such as vinyl chloride over the entire area.

[0009] (6) is a storage tank connected to an outlet path provided on one side of the evaporation pond (4) via an appropriate valve, (7) is a filtration chamber, (8) is a purification chamber, (9) is Heating room,
(10) is a removal chamber for removing water again. (11) is a sintering chamber having a system for sintering the salt body after passing through the system for further removing the water of the salt body in the crystalline state. The effect can be achieved.

[0010] Further, (12) is a product packaging system,
(13) is a warehouse for shipping finished products.

Normally, several evaporating ponds (4) are prepared, but here, for convenience, one evaporating pond (1) is assumed to be in an "empty" state with no seawater at present. I do.

Here, the valve (5) such as a wooden plug is pulled out, and the seawater (1) is introduced into the evaporation pond (4). At this time, the concentration of seawater is 1 ° to 2 °.

In this evaporation pond (4), the seawater is exposed to the sun and the water evaporates. Here, the brine whose concentration has been raised to a certain concentration is usually transferred to another new evaporating pond as described above, and its concentration further increases, and is eventually raised to about 25 °.

Subsequently, the brine is stored in a storage tank (6). After a certain amount of brine is stored, it is filtered in the filtration chamber (7) and purified in the purification chamber (8), and then heated in the heating chamber (9). Further, by removing the remaining water in the removal chamber (10), a natural sea salt rich in minerals which does not impair the round flavor was obtained.

At this time, as described above, the inner wall of the evaporation basin (4) has a synthetic resin sheet (14) such as vinyl chloride laid over its entire area.
Absorption of heat by the sun in the water is promoted, and the period of increasing the concentration can be greatly shortened as compared with the case where the synthetic resin sheet (14) such as vinyl chloride is not laid. There is no longer any danger of the minerals contained in the seawater escaping into the soil as compared to those made of clay.

Depending on the taste of the consumer, the salt body is fired in the firing chamber (11) after passing through the system for further removing the water of the salt body in the crystalline state.

[0017]

Embodiment 2 The embodiment shown in FIG. 2 is an example in which a plurality of evaporation ponds are provided in a stepwise manner, and valves (51) to (5n) such as wood plugs communicating the plurality of evaporation ponds (41) to (4n). ). As in the previous embodiment, a synthetic resin sheet (14) such as vinyl chloride is laid over the entire inner wall of each of the evaporation ponds (41) to (4n).

Further, a storage tank (6) for temporarily storing the brine concentrated by the plurality of evaporation ponds (41) to (4n) provided in a stepwise manner, and a filtration chamber for filtering and purifying the brine. (7), a heating system (9) for heating the brine to a crystalline state, and a removal chamber (10) for further removing moisture of the salt body in the crystalline state,
And a baking chamber having a system for baking the salt body. This baking chamber (11) may or may not be provided, as in the previous embodiment.

The seawater is supplied from the inlet (3) firstly.
To the evaporating pond (41). When exposed to the sun for a certain period of time and the concentration becomes constant, the valve (52)
Is opened to send brine to the next evaporating pond (42) and to fill the empty first evaporating pond (41) with fresh seawater. Since seawater is transferred to the evaporation ponds (4n) in a stepwise manner in this way, high concentration (about 25 °) brine can be produced very efficiently, and the same as in the previous embodiment described below. By operation, it is possible to obtain natural seawater salt rich in minerals.

At this time, since the inner wall of the plurality of evaporation ponds (4) has a synthetic resin sheet (14) such as vinyl chloride laid over the entire area, the inner walls of the evaporation ponds (4) are thereby laid. As in the previous example, the absorption of heat by the sun was promoted, the period for increasing the concentration was significantly shortened, and there was no danger that the minerals contained in the seawater would escape into the soil. is there.

[0021]

As described above, the present invention is a further improvement of the structure of the evaporating pond, and more specifically, a synthetic resin sheet such as vinyl chloride is laid over the entire inner surface of the evaporating pond. Yes, in comparison with conventional evaporation ponds,
It is easy to construct and can be constructed at low cost, and there is no fear that minerals contained in seawater escape into the soil.

In general, the effect of the present invention is a method for producing a salt in which natural minerals obtained by concentrating seawater using an evaporating pond are preserved as they are. That is, it is possible to produce a large amount of an alkaline salt having an excellent concentration.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a manufacturing process according to one embodiment of the present invention.

FIG. 2 is an explanatory sectional view of an evaporating pond according to another embodiment.

[Explanation of symbols]

 A1 to An, synthetic resin sheet 1, seawater 2, breakwater 3, seawater intake 41, 4n, evaporation pond 51, 5n, valve 6, storage tank 7, filtration room 8, purification room 9, heating room 10 , Removal room 11, drying room 12, packaging system 13, shipping warehouse 14, synthetic resin sheet such as vinyl chloride

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // C02F 1/14 C02F 1/14 Z

Claims (8)

[Claims] 1. A seawater intake, an evaporating pond configured to gradually increase the concentration of the introduced seawater, a tank for temporarily storing brine concentrated in the evaporating pond, A configuration for filtering and purifying the brine, a heating system for heating the brine to a crystalline state, and a system for further removing water from the salt body in the crystalline state; A method for producing a salt, comprising laying a synthetic resin sheet such as vinyl chloride over the entire surface. 2. The method for producing a salt according to claim 1, further comprising a system for firing the salt main body after passing through the system for further removing water from the salt main body in a crystalline state. 3. An intake port for seawater, a plurality of evaporation ponds configured to gradually increase the concentration of the intake seawater, and a tank for temporarily storing brine concentrated in the evaporation ponds. A configuration for filtering and purifying the brine, a heating system for heating the brine to a crystalline state, and a system for further removing water from the salt body in the crystalline state; Wherein a synthetic resin sheet such as vinyl chloride is laid over the entire inner surface of the salt. 4. The method for producing a salt according to claim 3, further comprising a system for firing the salt main body after passing through the system for further removing water from the salt main body in a crystalline state. 5. An evaporating pond in which a synthetic resin sheet such as vinyl chloride is laid over the entire inner surface, the step of gradually increasing the concentration of seawater taken into the pond, and the step of temporarily producing the produced brine. And a step of purifying the brine by further filtering, a step of further heating the brine to a crystalline state, and a system for further removing the water of the salt body in the crystalline state. A method for producing a salt, comprising laying a synthetic resin sheet such as vinyl chloride over the entire inner surface of the evaporation pond. 6. The method for producing a salt according to claim 5, further comprising a system for firing the salt main body after passing through the system for further removing water from the salt main body in a crystalline state. 7. A plurality of evaporation ponds on which a synthetic resin sheet such as vinyl chloride is laid over the entire inner surface are provided in a stepwise manner, and a valve is provided for communicating each of the evaporation ponds. A method for producing the salt according to claim 1. 8. The method according to claim 1, wherein the concentration of the evaporating pond is increased to approximately 25 degrees.