KR920003053B1 - Apparatus and method for producing common salt - Google Patents

Abstract

A edible salt is prepd. by (a) putting the natural salt into the pulverizing and washing appts (1), (b) pulverizing the natural salt and washing with saturated salt solution at the same time, (c) removing impurities from the pulverized washed natural salt by centrifugation in the separator (3), and (d) dehydrating the obtd. salt, drying at 200 deg.C in the dryer (6), and cooling in the coller (6) to obtain the purifyed edible salt. The obtd. edible salt contains a lot of mineral.

Description

Edible salt manufacturing method and apparatus

1 is a schematic view of the edible salt manufacturing apparatus according to the present invention.

2 is a cross-sectional view of the crushing washing apparatus according to the present invention.

3 is a cross-sectional view taken along line A-A of FIG. 2 showing the inside of the grinder body of the pulverizing washing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

1: pulverizing washing device 2: floating material separator

3: purified salt separator 4: saturated brine circulator

5: dryer 6: cooler

11: expected 12: fixed plate

13: cylindrical support ring 14: support bearing

15: support angle 16: grinder body

17: hopper 17 ': hopper support plate

18: crushing rod 19: drive device

20: rotating plate 20 ': dispersion rod

21: collection container 22: internal collection container

23 fuselage 24 floating material separation chamber

25: transfer pipe 26: inlet

27, 28, 29: discharge pipe 30: filter

31: reservoir tank 32: liquid transfer pump

33: circulation tube 34: natural salt source

35: transfer pipe 36: transfer pipe

The present invention relates to a method for producing purified edible salt from natural salts and to an apparatus used in such a method, and more particularly, to preparing a purified edible salt having a mineral component contained in the natural salt as it is.

Natural salts such as natural salts and rock salts produced from seawater cannot be used for food because they contain a large amount of impurities. These natural salts are used to make food salts through a process of removing impurities. As the processing method of the natural salt, ion exchange method, recrystallization method, direct drying method and the like are known.

The ion exchange method is a method of obtaining a pure NaCl component from a natural salt by ion exchange, and is known to be suitable for industrial use but unsuitable for food because the mineral component beneficial to the human body contained in the natural salt is completely removed.

In addition, the recrystallization method is a method of dissolving natural salts in water to remove suspended impurities, and then concentrating and recrystallizing them. There is a problem of this deterioration.

Direct drying method is a method of drying natural salt at high temperature in a rotary dryer to remove moisture and then crushing it into small particles.In case of drying at high temperature, impurities of some organic components are exhausted and removed, but impurities are not completely removed. There is a problem that the work speed is slow because it is very consuming and batch operation is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a simple and continuous process for preparing purified edible salts from which impurities contained in natural salt crystals are removed while retaining inorganic components contained in natural salts as it is, and an apparatus for carrying out the foregoing method. will be.

According to the present invention, the purpose of the above-described invention is achieved by washing the natural salt pulverized into fine particles with saturated brine and circulating and washing the natural salt and circulating and washing the natural salt.

In one embodiment of the present invention, natural salt is introduced into a mill with saturated brine to pulverize the natural salt into fine particles and simultaneously washed with saturated brine to remove impurities contained in the natural salt, followed by dehydration and drying of the removed zero particles. It is organized in a way.

In the method of the present invention, when saturated salt is introduced into the crushing washing machine at the beginning of the refining operation, saturated water is added separately by adding drinking water together with the natural salt and filtering and circulating the washing water after washing or centrifugation. You do not need to use it.

In particular, in the method of the present invention, when the salts pulverized into fine particles during the pulverizing washing process are separated from the salts having a large particle size together with the washing water, the prepared salts have a uniform particle size and are suitable for edible use. At this time, the separated fine powder of salt can be reprocessed and used for food or to make a saturated solution of washing water.

According to the method of the present invention described above, washing with saturated brine simultaneously with pulverization removes impurities contained in large crystals of the natural salt supplied as well as washing water with saturated brine. It will maintain the particle size. In particular, the method of the present invention is made from a pulverized washing to recovery of the purified salt in a continuous process and does not use a separate heating method, the entire process is made simple and quick.

Another embodiment of the present invention is a pulverizing washing apparatus for washing natural salts with saturated brine simultaneously with pulverization, a separator for suspended solids suspended in saturated brine from the crushed washing apparatus, and a purified salt separator for separating purified salts from saturated brine from which suspended solids are separated. And an edible salt manufacturing apparatus configured to circulate a saturated brine used for washing the natural salt to a pulverizing washing apparatus.

The pulverizing washing apparatus of the present invention includes a cylindrical crusher body fixedly installed in a base, a rotating plate installed horizontally in the center of the crusher, rotated by a rotating device, and a plurality of crushing rods vertically fixed in a space between the swivel plate and the crusher side wall. And a collecting container attached to the bottom of the grinder.

A hopper for injecting natural salt and saturated brine was installed above the rotating plate of the washing apparatus, so that the natural salt and saturated salt water supplied to the hopper were supplied above the rotating disc.

In the pulverizing washing apparatus of the present invention, the rotating plate is installed at the center of the cylindrical crusher by a support angle so that the rotating plate can be rotated by a driving device such as a motor, and the natural salt introduced into the upper surface toward the crushing rod by centrifugal force with saturated brine. As it scatters, the natural salt impinges on the crushing rod, which is crushed and washed. In addition, the collecting vessel under the washer is separated into an outer collector and an inner collector that is coaxial to the outer collector, so that the fine particles of salt flowing down the side wall of the grinder body are collected into the outer collector and have an appropriate particle size as an edible salt inside. You may also want to bring in zeros.

Float separator and centrifugal separator constituting the crushing washing apparatus of the present invention can be used conventional.

In the apparatus of the present invention, the washing water discharge pipe is connected to the external collection tank of the crushing washing device, the floating water discharge pipe is connected to the floating material separator, and the discharge water pipe is separated from the centrifuge to collect the washing water discharged through the discharge pipes and After separating solids such as suspended solids and circulating the filtered saturated brine solution through a pulverizing washing apparatus, the washing water can be used again and again, which is economically advantageous.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, the edible salt producing apparatus of the present invention is a pulverized washing device (1), a float separation device (2) for separating the suspended solids from impurities from the washing water discharged from the crushing washing device, from the saturated brine discharged from the float separation device It is composed of a purified salt separator (3) for separating purified salt and a saturated brine circulator (4) for removing solid impurities from washing water containing impurities discharged from the aforementioned devices and circulating only saturated brine to the pulverized washing apparatus (1). do.

In the pulverizing washing apparatus 1 of the present invention, the cylindrical support ring 13 is installed on the fixed plate 12 of the base 1, and the outer end of the support angle 15 of the support bearing 14 on the support ring 13 is cylindrical. The crusher body 16 is installed vertically, and a hopper 17 and a plurality of crushing rods 18 are mounted on a circular support plate 17 ′ fixed to the top of the body 16, and the center of the body 16 is installed. The rotating plate 20 rotated by the drive device 19 mounted on the base plate was rotatably supported by the bearing 14 located at the base plate, and the collector 21 was installed below the fuselage. On the outer circumference of the rotating plate 20, a dispersion rod 20 'for uniformly dispersing salt scattering may be placed.

In the above-described pulverizing washing apparatus 1 of the present invention, the body 16 is made of an elastic material such as a rubber plate, or made of a metal material having an elastic body on an inner circumferential surface thereof, so that salt is scattered by the rotation of the rotating plate 20. The friction noise of the particles can be reduced. In addition, the collector 21 is installed inside the other collector 22 to be coaxial with the outer collector 21 inside the coarse salt particles scattered to the inner wall of the body is collected in the outer collector 21 And coarse salt particles may be collected in the inner collecting container 22.

Float separation device 2 of the present invention forms a float separation chamber 24 on the upper inner circumferential wall of the body 23 and is transferred from the pulverization washing apparatus to the transfer pipe 25 to the fuselage 23 through the inlet 26. Floating suspended on the surface of the wash water introduced into the collection was discharged.

Purified salt and saturated brine from which the suspended solids as impurities are separated and removed in the above-mentioned suspended solids separator (2) are supplied to the purified salt separator (3) and separated into saturated brine and purified salt. The separator (3) is a conventional centrifuge. Can be used. The refined salt separator is connected to a dryer 5 and a cooler 6 for drying and cooling the separated purified salt.

In the apparatus of the present invention, each of the external collection tank 21 of the pulverizing washing device 1, the floating water separating chamber 24 of the floating material separating device 2, and the washing water outlet of the purified salt separating device 3 are discharge pipes 27 ( 28 and 29 are connected and the discharge pipes 27 and 28 and 29 are connected to the saturated brine circulator 4 composed of the filter 30, the reservoir tank 31 and the liquid transfer pump 32, respectively. In this way, the solid impurities were filtered out from the finely divided salt-containing saturated brine and the suspended-containing saturated brine drained from the pulverizing washing apparatus 1, and then circulated and supplied to the pulverizing washing apparatus 1 through the circulation pipe 33.

An example of a method of preparing edible salt using the apparatus of the present invention will be described. A natural salt source 34 and saturated brine are rotated at a high speed by operating the driving device 19 with a motor 19 '. When the salt and the saturated salt are simultaneously introduced into the upper surface of the rotating plate 20 from the circulation pipe 33, the natural salt and the saturated salt are crushed while being scattered toward the crushing rod 18 installed around the rotating plate by rotating the rotating plate 20. The natural salt particles that collide with the rod 18 and fall into the inner collecting vessel 22 as the natural salt is broken, and at the same time, the natural salt particles reaching the inner wall of the grinder body 16 are pulverized in the form of fine particles, and then into the outer collecting vessel 21. Will fall.

Natural salt particles dropped and collected into the inner collecting vessel 22 are supplied to the float separation device 2 through the transfer pipe 25 together with saturated brine and are dropped into the outer collecting vessel 21 and collected. And saturated brine are supplied through the discharge pipe 27 into the filter 30 of the circulation device (4). At this time, the impurities contained in the natural salt are washed with saturated brine during the natural salt is crushed, only the impurities are washed because the washing water is saturated brine, and the salt itself is no longer dissolved.

The saturated brine introduced together with the salt particles into the float separation device 2 through the inlet 26 contains a large amount of water insoluble and floats floating on the surface of the saturated brine. Is supplied into the filter 30 of the circulator 4 through the discharge pipe 28, and the refined salt from which the suspended matter is separated into the refined salt separator 3 through the transfer pipe 35. It is separated into solid tablet salt and saturated brine.

The refined salt separated from the refined salt separator 3 is supplied to the dryer 5 through a transfer pipe 36 and dried at about 200˚C, then cooled to 70˚C in the cooler 6, then sealed-packed and separated ( The saturated brine separated in 3) is supplied into the filter 30 of the circulation device 4 through the discharge pipe (29).

Saturated brine supplied into the filter 30 from the pulverizing washing device (1) and the suspended solids separating device (2) and the refined salt separating device (3) is separated from the solids in the filter (30) and transferred to the reservoir (31), and then pumped ( 32) to the saturated brine feed pipe (33).

According to the method of the present invention described above, since natural salts having a large particle size are pulverized and washed at the same time as the crushing washing apparatus, the impurities contained in the natural salts having a large particle size are not only washed out but also the saturated saline and salts are washed because the washing liquid is saturated brine. As a result of the solid-liquid equilibrium, the salt particles are not dissolved in the liquid phase, and some of the dissolved salts are recrystallized immediately, so that there is no need for heating to remove and concentrate the water as in the evaporation method. Moreover, according to the present invention, since the saturated brine used as the washing water is circulated, it is not necessary to consume an excessive amount of salt to make the saturated brine.

Hereinafter, the edible salt manufacturing method of the present invention using the apparatus shown in the drawings will be described in detail by way of examples.

EXAMPLE

Commercially available natural salts and saturated brine are supplied to the upper surface of the rotary plate 20 in the pulverizing washing apparatus 1 through the supply pipe salt source 34, the circulation pipe 33, and the hopper 17, respectively, to crush the natural salt and simultaneously saturate the brine. The fine particle salt flowing down along the circumference of the grinder body 16 and the salt particles of medium particle size colliding with the crushing rod 18 at the center of the body and falling down, respectively, are collected in the outer collector 21 and the inner collector 22, respectively. ) And then the salt particles and the saturated salt water collected in the inner collecting container 22 are fed into the float separation device 2 through the conveying pipe 25 and the conveying device 25 ＂having the valve 25 '. 26, and the fine salt powder and the saturated brine collected in the outer collector 21 are transferred to the filter 30 of the saturated brine circulator 4 through the discharge pipe 27 having the valve 27 '. .

The saturated brine and salt particles introduced into the float separation device 2 maintain the saturated brine level above the top of the separation chamber 24 installed inside the fuselage 23 so that the floating impurities released during the cleaning are separated from the separation chamber ( 24, the salt particles are introduced into the filter 30 through the discharge pipe 28 and the suspended solids are transferred to the refined salt separator 3 through the transfer pipe 35, and saturated salt water is purified from the purified salt as a solid. After separating the saturated brine is transferred to the filter (30), the transfer pipe (36) to the dryer (5), dried to a high temperature of about 200˚C, transferred to the cooler (6) and cooled to about 70˚C and then packed Transported and packed.

Saturated brine containing salt fine particles and suspended solids discharged from the above-described pulverizing washing apparatus (1), floating matter separating device (2), and refined salt separating device (3) is filtered through a filter (30) to separate and remove solids containing impurities. The saturated brine is then circulated through the reservoir 31 and the pump 32 to the circulation pipe 33.

As can be seen from the component analysis results of the sun salt used in the present invention and the refined salt prepared therefrom, an edible refined salt of good quality was obtained.

TABLE 1

Note: 1. Component analysis was performed by KSH7101 ('84).

2. The unit is%.

Claims (9)

A method for producing purified edible salt by removing impurities from natural salt, wherein the edible salt is pulverized and washed with saturated brine. Method according to claim 1, characterized in that the grinding of the natural salt and the washing with saturated brine proceed simultaneously simultaneously. Method according to claim 1 or 2, characterized in that the saturated brine removes impurities from the wash water resulting from the washing of the natural salt. In an apparatus for producing purified edible salt by removing impurities from natural, a pulverized washing device (1) for pulverizing natural salt and washing with saturated brine, and suspended matter from saturated brine containing salt particles discharged from the crushing washing device (1) Float separator (2) for separating and removing the salt, purified salt separator (3) for separating the salt particles discharged from the float separator (2) from saturated brine, and salt particles in the apparatus (1) (2) (3). Purified edible salt manufacturing apparatus consisting of a saturated brine circulator (4) for circulating the saturated brine separated from the field to the crushing washing device (1). In claim 4, the pulverizing washing apparatus 1 is installed below the hopper in the center of the pulverizer body 16 and the pulverizer body 16, which has a hopper 17 for supplying natural salts and saturated brine at the center thereof, and Rotating plate 20, which is scattered between the rotating plate 20, the rotating plate 20 and the crusher body 16 to rotate the natural salt and saturated brine to the outside while rotating to the impact of the natural salt scattered from the rotating plate 20 And a collecting vessel collecting salt particles and saturated brine which are installed on the bottom of the fuselage and fall. Device according to claim 4, characterized in that the circulation device (4) comprises an impurity filter (30). Device according to claim 5, characterized in that the rotating plate (20) has a dispersing rod (20 ＂) on the outer periphery to allow the edible salt and saturated brine to be dispersed evenly to the outside. In claim 5, the collecting vessel has an internal collection tube 22 having an outlet tube 25 connected to the float separator 2 and an outlet tube 27 for transporting particulate salt particles and saturated brine to the circulator 4. Apparatus characterized in that it consists of an internal collection tube (21) having a. Device according to claim 5, characterized in that the mill body (16) has at least an elastic body on the inner circumferential surface.

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