CN111792653A - Production method for preparing spherical salt by single-effect evaporation by utilizing mechanical thermal compression technology - Google Patents
Production method for preparing spherical salt by single-effect evaporation by utilizing mechanical thermal compression technology Download PDFInfo
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- CN111792653A CN111792653A CN202010555208.5A CN202010555208A CN111792653A CN 111792653 A CN111792653 A CN 111792653A CN 202010555208 A CN202010555208 A CN 202010555208A CN 111792653 A CN111792653 A CN 111792653A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
- B01D9/0031—Evaporation of components of the mixture to be separated by heating
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/22—Preparation in the form of granules, pieces, or other shaped products
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/80—Compositional purity
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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Abstract
The invention relates to a production method for preparing spherical salt by single-effect evaporation by utilizing a mechanical thermal compression technology, which belongs to the technical field of inorganic chemical processes and comprises the steps of dissolving salt, naturally settling and purifying brine from raw salt to obtain saturated and clean raw brine; comprises the step of evaporating and crystallizing saturated brine; comprises the steps of thickening, centrifuging, drying and screening salt slurry. The method takes solarized sea salt as a raw material, and carries out salt melting, sedimentation, filtration and purification, evaporation crystallization, centrifugation, drying, screening and packaging procedures on the solarized sea salt to produce the spherical salt, and combines a mechanical thermal compression (MVR) technology in the production of the spherical salt, so that single-effect evaporation is realized, and the spherical salt can be prepared by recycling heat energy. According to the method, by controlling the circulation volume and the retention time of the salt slurry in the crystallizer, the spherical edible salt product with full particles, smooth crystal form, regular appearance and good fluidity is obtained.
Description
Technical Field
The invention relates to a production method for preparing spherical salt by single-effect evaporation by utilizing a mechanical thermal compression technology, belonging to the technical field of inorganic chemical processes.
Background
Most of the traditional refined salt products are hexagonal crystals, while the spherical and spheroidal salt products are rarely produced industrially and are basically in the theoretical research stage, although the varieties of the salt are rich at present, the published related researches are less, and a greater degree of technical blockade is formed.
The salt manufacturing industry is starting a technical revolution by utilizing a heat pump, namely, a mechanical compression secondary steam (MVR) evaporation salt manufacturing technology, and at present, the heat pump technology is used for meeting the requirements of new construction and extension projects of the salt manufacturing industry on steam by utilizing the heat pump technology 'steam exchange by electricity', which is a necessary trend of the survival and development of the salt manufacturing industry. The heat pump is used as a project heating source, no toxic and harmful waste is discharged in the production process, and the construction conforms to the industrial policy of energy conservation and environmental protection. At present, salt-making enterprises adopting heat pump technology are available at home and abroad, but no precedent for producing spherical salt by utilizing the technology exists.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a production method for preparing spherical salt by single-effect evaporation by utilizing a mechanical thermal compression technology; the mechanical hot compression technology is adopted to realize the recycling of steam, the traditional multi-effect evaporation salt preparation method is changed, the mechanical hot compression technology is used for producing spherical edible salt, and the salt particles of the hexagonal body are subjected to agglomeration, friction, repair and other processes to form spherical or spheroidal salt products through process control, so that the crystal form is more perfect.
The invention aims to obtain a production method of spherical salt which can meet the market demand of high-end salt products. The product obtained by the technology has high purity, white color, uniform particles and good fluidity, can achieve the effect of no caking after long-term storage without adding a loosening agent, meets the requirement on green products without adding salt, and simultaneously, the spherical salt produced by the technology can also be used as multifunctional health-care salt. For example, the fish roe salt produced by the item has uniform particles and smooth surface, so the fish roe salt is not scratched when in use and is an optimal bath salt carrier.
The invention is realized by the following specific technical scheme:
a production method for preparing spherical salt by single effect evaporation by utilizing a mechanical thermal compression technology comprises the steps of carrying out salt melting, natural sedimentation and brine purification on raw salt to obtain saturated clean raw brine; comprises the step of evaporating and crystallizing saturated brine; comprises the steps of thickening, centrifuging, drying and screening salt slurry; the evaporative crystallization is realized by a crystallization evaporator, mainly comprises an evaporation chamber, a circulating pipe and a heating chamber, and is provided with a crystallizer circulating pump, and the crystallizer circulating pump is used for enabling crystal slurry to enter the evaporation chamber from the circulating pipe after passing through the heating chamber and then flow into the circulating pipe for forced circulation flow, so that the supersaturation degree of the salt slurry is controlled. In the invention, when the brine in the evaporation crystallizer is added with 35% of the liquid level, the circulating pump is started.
Further, the method comprises a preheating and temperature rising step before saturated brine enters a crystallization evaporator, wherein the saturated brine enters from the middle part of a circulating pipe of the evaporator in a tangential direction, and centrifugal mother liquor is added simultaneously to maintain the constant solid-liquid ratio of the crystal slurry concentration in the crystallizer at 1400-1450 Kg/m3In the meantime.
And further discharging secondary steam of the crystallization evaporator from the top of the crystallization evaporator, removing foam, solid impurities and liquid drops with the size larger than 5 microns in the steam through a demister and a gas washing tower, feeding the purified steam into a steam compressor for compression through a wire mesh demister, increasing the temperature and the pressure of the compressed steam to form supersaturated steam, spraying high-temperature water on the supersaturated steam in a desuperheater to form saturated steam, and feeding the saturated steam into the crystallization evaporator again.
Furthermore, the temperature and the pressure of the compressed steam are improved to form supersaturated steam, the temperature of the superheated steam is 192 ℃, the pressure of the superheated steam is 300KPa, the supersaturated steam is sprayed with high-temperature water in a desuperheater to form saturated steam, the saturated steam enters the evaporator again, and the temperature of the saturated steam is 133 ℃.
Further, when the granularity of the spherical salt is larger than 0.2mm, the spherical salt is deposited in salt feet at the bottom of the evaporator, clean brine with a certain flow is added into the salt feet, small-particle spherical salt floats upwards to enter a crystallizer for continuous crystallization, and the spherical salt with the particle size of 0.2-2 mm is discharged by a salt slurry pump to enter a thickener; the salt slurry enters a packaging system for packaging in bags after being thickened, centrifuged, dried and screened.
The beneficial technical effects of the invention are as follows: by controlling the circulation amount and the retention time of the salt slurry in the crystallizer, the spherical edible salt product with full particles, smooth crystal form, regular appearance and good fluidity is obtained.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention relates to a production method for preparing spherical salt by single-effect evaporation by utilizing a mechanical thermal compression technology, which comprises the following steps as shown in figure 1:
(1) adding industrial raw salt into a salt dissolving tank by a fighter loader, dissolving the raw salt into a saturated sodium chloride solution (300g/L) after introducing steam condensate water, and overflowing the saturated sodium chloride solution from the upper part of the salt dissolving tank into a brine sedimentation tank for natural sedimentation to separate solid suspended matter impurities;
(2) sending the saturated brine settled in the settling pond to a brine cleaning barrel for storage and use through a brine feeding pump and a cloth bag type filter;
(3) refined saturated brine enters a crystallization evaporator from a brine cleaning barrel through a pump and a plate type preheater, and a heating medium entering the preheater is steam condensate water, so that the brine temperature is improved by utilizing waste heat, and the raw steam supplement amount is reduced; the crystallizer mainly comprises an evaporation chamber, a circulating pipe and a heating chamber, wherein a crystallizer circulating pump is arranged at the bottom of the crystallizer circulating pump, so that crystal pulp enters the evaporation chamber from the circulating pipe after passing through the heating chamber and then flows into the circulating pipe for forced circulation flow, and the supersaturation degree of the salt pulp is controlled by controlling the circulating amount.
(4) Continuously feeding saturated brine subjected to waste heat into a circulating pipe of a crystallization evaporator, tangentially feeding the saturated brine from the middle part of the circulating pipe of the evaporator, and simultaneously adding centrifugal mother liquor to maintain the concentration (solid-liquid ratio) of crystal slurry in a crystallizer to be constant between 1400 and 1450Kg/m 3;
(5) the salt slurry circularly flows in the crystallizer, crystals gradually form spherical salt particles through factors such as agglomeration, friction, collision, restoration, growth and the like, the salt particles automatically sink into salt feet after reaching a certain specification, elutriation brine with a certain flow is added into the salt feet, small particles enter the crystallizer to be continuously crystallized and grown, and the spherical salt with larger particles is discharged into the thickener through the salt slurry pump;
(6) secondary steam is discharged from the top of the crystallizer, foam and solid impurities are separated by a demister and then enter a gas washing tower to further remove the foam, the solid impurities and liquid drops in the secondary steam, good conditions are provided for stable operation of a compressor, purified steam enters a steam compressor for compression through a wire mesh demister, compressed superheated steam becomes saturated steam through a desuperheater and then enters a crystallization evaporator for recycling, and some raw steam needs to be added due to process loss;
(7) the salt slurry solid in the thickener settles to the bottom, and overflows into a centrifuge for dehydration when reaching a certain liquid level;
(8) the spherical salt dehydrated by the centrifugal machine is sent to a fluidized bed dryer by a belt conveyor;
(9) the dried spherical salt is fed into a vibrating screen for screening, the screen mesh is 12 meshes, and the dried product is divided into two grades, namely the ratio of the spherical salt with the particle size of less than or equal to 1.5mm is about 90-95%, and the ratio of the product with the particle size of more than 1.5mm is 5-10%;
(10) after being lifted by a bucket elevator into a storage bin, spherical salt products with the particle size of less than or equal to 1.5mm are conveyed to a drum screen through a belt conveyor, the drum screen divides the spherical salt into 2 grades, namely the particle sizes of less than or equal to 0.85mm and more than 0.85mm, and then the spherical salt products are respectively conveyed into finished product packages.
The crystallizer mainly comprises an evaporation chamber, a circulating pipe and a heating chamber, wherein a crystallizer circulating pump is arranged at the bottom of the crystallizer circulating pump, so that crystal slurry enters the evaporation chamber from the circulating pipe through the heating chamber and then flows into the circulating pipe for forced circulation flow, the supersaturation degree of the salt slurry is controlled by controlling the circulating amount, and when the solid-liquid ratio reaches 42-46% vol, the crystals are easy to form spherical salt products through factors such as agglomeration, friction, repair, growth and the like.
Example 1:
saturated sodium chloride solution (300g/L) is subjected to salt melting, natural sedimentation and brine purification to obtain saturated clean raw material brine, the saturated brine enters a crystallization evaporator after being preheated and heated (more than or equal to 50 ℃), enters the crystallization evaporator from the middle part of an evaporator circulating pipe in a tangential manner, and simultaneously, centrifugal mother liquor obtained after centrifugal separation of evaporation crystallization is added to maintain the concentration (solid-to-liquid ratio) of crystal slurry in the crystallizer constant. The secondary steam of the crystallization evaporator of the invention is treated by a demister and a gas washing tower to remove foam, solid impurities and liquid drops with the diameter more than 5 mu m in the steam, and the purified steamSteam enters a steam compressor through a wire mesh demister to be compressed, superheated steam is set to reach the temperature of 192 ℃ and the pressure of 300KPa, supersaturated steam is sprayed into high-temperature water in a desuperheater to become saturated steam, the saturated steam enters an evaporator again, and the temperature of the saturated steam is 133 ℃. When the solid-liquid ratio of crystal slurry in the crystallizer reaches 42-46% vol, the crystal forms spherical salt products through factors such as agglomeration, friction, repair, growth and the like. When the particle size of the spherical salt is larger than 0.2mm, the spherical salt is deposited in the salt foot at the bottom of the evaporator, and clean brine with a certain flow rate (the index of refined brine is that NaCl is larger than or equal to 25.0 percent, and CaSO is added into the salt foot4≤0.18％，MgSO4≤0.07％，MgCl2Not more than 0.16 percent, not more than 0.001 percent of water-insoluble substances, not more than 5nut of turbidity and not more than 10mg/l of suspended substances), so that the small-particle spherical salt floats upwards and enters a crystallizer for continuous crystallization, and the spherical salt with 0.2-2 mm of larger particles is discharged by a salt slurry pump and enters a thickener. The salt slurry enters a packaging system for packaging in bags after undergoing the processes of thickening, centrifuging, drying, screening and the like.
The indexes of the obtained product are as follows: the obtained product meets the national high-grade standard of edible salt (GB 5461-2016), and has a spherical or ellipsoidal appearance.
National standard for edible salt GB5461-2016
Claims (9)
1. A production method for preparing spherical salt by single-effect evaporation by utilizing a mechanical thermal compression technology is characterized by comprising the following steps:
the method comprises the steps of dissolving salt in raw salt, naturally settling and purifying brine to obtain saturated clean raw brine;
comprises the step of evaporating and crystallizing saturated brine;
comprises the steps of thickening, centrifuging, drying and screening salt slurry;
the evaporative crystallization is realized by a crystallization evaporator, mainly comprises an evaporation chamber, a circulating pipe and a heating chamber, and is provided with a crystallizer circulating pump, and the crystallizer circulating pump is used for enabling crystal slurry to enter the evaporation chamber from the circulating pipe after passing through the heating chamber and then flow into the circulating pipe for forced circulation flow, so that the supersaturation degree of the salt slurry is controlled.
2. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 1, which is characterized in that: the method comprises a preheating and temperature-rising step before saturated brine enters a crystallization evaporator, wherein the saturated brine enters from the middle part of a circulating pipe of the evaporator in a tangential direction, and centrifugal mother liquor is added simultaneously to maintain the concentration solid-liquid ratio of crystal slurry in a crystallizer constant.
3. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 1, which is characterized in that: the secondary steam of the crystallization evaporator is discharged from the top of the crystallization evaporator, foam, solid impurities and liquid drops in the steam are removed through a demister and a gas washing tower, the purified steam enters a steam compressor through a wire mesh demister to be compressed, the temperature and the pressure of the compressed steam are increased to form supersaturated steam, and the supersaturated steam is sprayed with high-temperature water in a desuperheater to form saturated steam and then enters the crystallization evaporator again.
4. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 1, which is characterized in that: the temperature and the pressure of the compressed steam are improved to form supersaturated steam, the temperature of the superheated steam is 192 ℃, the pressure of the superheated steam is 300KPa, the supersaturated steam is sprayed with high-temperature water in a desuperheater to form saturated steam, the saturated steam enters the evaporator again, and the temperature of the saturated steam is 133 ℃.
5. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 1, which is characterized in that: when the granularity of the spherical salt is long to a certain degree, the spherical salt is deposited in a salt foot at the bottom of the evaporator, clean brine with a certain flow is added into the salt foot, small-particle spherical salt floats upwards to enter a crystallizer for continuous crystallization, and larger-particle spherical salt is discharged by a salt slurry pump to enter a thickener; the salt slurry enters a packaging system for packaging in bags after being thickened, centrifuged, dried and screened.
6. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 1, which is characterized in that: when the brine in the evaporation crystallizer is added with 35 percent of the liquid level, the circulating pump is started.
7. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 2, which is characterized in that: maintaining the solid-liquid ratio of the crystal slurry concentration in the crystallizer at 1400-1450 Kg/m3In the meantime.
8. The method for producing spherical salt by single effect evaporation with mechanical thermal compression technique as claimed in claim 3, wherein: separating out liquid drops and foams with the diameter of more than 5 mu m by a demister.
9. The method for producing spherical salt by single-effect evaporation through mechanical thermal compression technology as claimed in claim 5, which is characterized in that: the granularity of spherical salt deposited in the salt foot at the bottom of the evaporator is more than 0.2 mm; and discharging spherical salt with the particle size of 0.2-2 mm into a thickener through a salt slurry pump.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113044858A (en) * | 2021-03-16 | 2021-06-29 | 姜秉严 | TGC crystallization process for salt pan |
| CN113577799A (en) * | 2021-07-20 | 2021-11-02 | 山东菜央子盐场有限公司 | Application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production process technology |
| CN114573004A (en) * | 2022-03-23 | 2022-06-03 | 河南平煤神马天泰盐业有限公司 | Production process of additive-free small-particle salt |
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Cited By (3)
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| CN113044858A (en) * | 2021-03-16 | 2021-06-29 | 姜秉严 | TGC crystallization process for salt pan |
| CN113577799A (en) * | 2021-07-20 | 2021-11-02 | 山东菜央子盐场有限公司 | Application method of MVR heat pump evaporation salt production in multi-effect vacuum salt production process technology |
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