CN109455739B - Method for preparing low-sodium salt by sun-drying magnesium sulfate subtype brine - Google Patents
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Abstract
The invention relates to a method for sun-curing low-sodium salt by utilizing magnesium sulfate subtype brine, which comprises the following steps: firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, and naturally freezing by adopting a salt pan natural overwintering freezing process to obtain frozen saltpeter brine; salt pan natural evaporation I: pumping frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation to obtain sodium chloride solid and high-potassium brine respectively; performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation to obtain a low-sodium salt semi-finished product and tail brine respectively; fourthly, water washing and screening: mixing the low-sodium salt semi-finished product with frozen nitre brine, and screening to obtain a low-sodium salt intermediate product; fifthly, washing, drying and packaging of repulped slurry: and mixing the low-sodium salt intermediate product with frozen nitre brine, replenishing fresh water, stirring, washing, separating, drying and packaging to obtain the low-sodium salt product. The invention improves the crystallinity of low sodium salt, not only has simple process, but also greatly reduces the production cost, and has stronger market competitiveness.
Description
Technical Field
The invention relates to the field of salt production, in particular to a method for preparing low-sodium salt by utilizing magnesium sulfate subtype brine in the sun.
Background
Salt is an indispensable necessity for human beings. Salt has been used in condiments by humans as early as 5000 years ago. Scientific researches in recent years show that the real value of common salt is not only an indispensable salty taste agent, but also a nutrient element necessary for maintaining and promoting the physiological functions of human bodies. However, excessive intake of sodium in the salt may be harmful to human health. The foreign 70 s have begun to change the salt of the seasoning into a nutritional product, and in western europe, japan, etc. in the middle of the 80 s, low sodium salt has become the most popular salable product.
According to statistics of relevant aspects, hypertension patients in China break through 3.3 hundred million currently, wherein the prevalence rate of hypertension of residents aged 18 years and older is 33.5%, and the prevalence rate of old people aged 60 years and older is 66.9%. According to the data of the national health department, the death of residents in China is due to cardiovascular and cerebrovascular diseases and hypertension accounting for 40 percent, and the visible cardiovascular and cerebrovascular diseases and hypertension are the first threats to the health of residents in China. Hypertension is due to a number of causes, of which excessive sodium intake and insufficient potassium intake are important risk factors.
The international medical experts consider that the imbalance of the proportion of sodium and potassium in a human body caused by excessive edible salt is one of the causes of hypertension and heart disease. It is understood that the biggest problem in the diet of our country is unbalanced intake of sodium and potassium, and the intake is shown as overhigh intake of sodium. From the dietary structure, the main sodium intake of China is from common salt, and low sodium salt is the best choice for reducing sodium and supplementing potassium. The low-sodium salt as a healthy salt can help a human body to reduce sodium and supplement potassium, realize sodium and potassium balance and play a certain role in preventing and controlling heart and cerebral vessels.
At present, the low sodium salt in the market is mainly obtained by a mixing mode, namely, iodized salt is taken as a raw material, and a certain amount of edible-grade potassium chloride is added, so that the ratio of sodium to potassium in the salt is changed. Chinese patent CN106820073A discloses a method for directly preparing low sodium salt from sulfate brine, i.e. a method of blending high magnesium brine and sodium saturated brine to precipitate carnallite sodium chloride mixed salt, and then adding water to elute magnesium chloride to prepare a low sodium salt product, which provides a feasible production method for extracting low sodium salt from sulfate brine. Chinese patent CN106858521A discloses a method for preparing low sodium salt, which is to add carnallite into chloride type brine and mix with the carnallite for halogenation, and then naturally evaporate to obtain the low sodium salt.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for sun-drying low-sodium salt by using magnesium sulfate subtype brine, which has simple process and low cost.
In order to solve the problems, the method for preparing the low-sodium salt by using the magnesium sulfate subtype brine through sun drying comprises the following steps:
firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, and naturally freezing by adopting a salt pan natural overwintering freezing process to obtain frozen saltpeter brine;
salt pan natural evaporation I: pumping the frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation when the concentration of potassium ions in the evaporation mother liquor A is 25-50 g/L to respectively obtain sodium chloride solid and high-potassium brine; the sodium chloride solid is sold as an edible salt product;
performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation when the concentration of magnesium ions in the evaporation mother liquor B is 50-85 g/L to respectively obtain a low-sodium salt semi-finished product and tail brine; discharging the tail bittern;
fourthly, water washing and screening: mixing the low-sodium salt semi-finished product and the frozen nitre brine according to 20-30 wt% and screening by a 60-80 mesh screen, converting a large amount of mixed brine and solid materials passing through a standard screen aperture into undersize through a screen, and returning to the step for continuous evaporation and crystallization; the medium product of low sodium salt is obtained on the screen;
fifthly, washing, drying and packaging of repulped slurry: preparing slurry from the low-sodium salt intermediate product and the frozen nitre brine according to 30-40 wt%, supplementing fresh water according to 5-10% of the total mass of the system, stirring and washing, and separating after 15-30 min to respectively obtain a wet-based low-sodium salt product and a separation liquid; drying the wet-based low-sodium salt product by a roller dryer and packaging to obtain a low-sodium salt product; and returning the separated liquid to the step three, and continuously evaporating and crystallizing.
The method comprises the steps of controlling the temperature of brine water to be minus 10 +/-10 ℃ in a freezing process, and keeping the temperature for at least 24 hours.
The temperature of the brine is minus 5 ℃ to minus 15 ℃.
The method comprises the following steps of evaporating the potassium ion concentration in the mother liquor A to 33-40 g/L.
And step three, the concentration of magnesium ions in the evaporation mother liquor B is 80-85 g/L.
And step four, the proportion of blended slurry is 28-30 wt%.
And step four, the screening aperture is 60-75 meshes.
The fresh water adding amount in the step fifthly is 5-8% of the total mass of the system.
The centrifugal separation factor in the step fife is not lower than 1000.
The drying condition of the drum dryer in the step fifthly means that an interval mode is adopted, the heating medium is steam or hot air, the heating temperature is 110 +/-2 ℃, and the material residence time is 30-120 min.
Compared with the prior art, the invention has the following advantages:
1. the invention prepares the low-sodium salt product by naturally freezing natural brine, evaporating and sun-drying a potassium chloride and sodium chloride mixed material in a salt pan and washing, and the product meets the GB2019-2005 standard requirement through detection.
2. Compared with the prior art, the invention reduces the processes of processing edible potassium chloride and mixing sodium and potassium, improves the crystallinity of low sodium salt, has simple process, greatly reduces the production cost and has stronger market competitiveness.
Detailed Description
Embodiment 1a method for sun-curing low-sodium salt using magnesium sulfate subtype brine, comprising the following steps:
firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, naturally freezing by adopting a salt pan natural overwintering freezing process, controlling the temperature of the brine to be minus 10 +/-10 ℃, and keeping the temperature for at least 24h to obtain the frozen nitre brine.
Salt pan natural evaporation I: pumping the frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation when the concentration of potassium ions in the evaporation mother liquor A is 25-30 g/L to respectively obtain sodium chloride solid and high-potassium brine; sodium chloride solids are sold as edible salt products.
Performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation when the concentration of magnesium ions in the evaporation mother liquor B is 50-60 g/L to respectively obtain a low-sodium salt semi-finished product and tail brine; and discharging tail bittern.
Fourthly, water washing and screening: mixing the low-sodium salt semi-finished product and frozen nitre brine by 20wt% and screening by a 60-mesh screen, converting a large amount of mixed brine and solid materials passing through a standard screen aperture into undersize through the screen, and returning to the step II for continuous evaporation and crystallization; the low sodium salt intermediate product is obtained on the screen.
Fifthly, washing, drying and packaging of repulped slurry: preparing slurry of the low-sodium salt intermediate product and frozen nitre brine according to 30wt%, supplementing fresh water according to 5% of the total mass of the system, stirring and washing, placing in a centrifugal machine after 15min, and separating according to a centrifugal separation factor of not less than 1000 to respectively obtain a wet-based low-sodium salt product and a separation liquid; putting the wet-based low-sodium salt product into a roller dryer, drying at intervals, wherein the heating medium is steam or hot air, the heating temperature is 110 +/-2 ℃, the retention time of the material is 30min, the dried material is a low-sodium salt finished product, and packaging to obtain the low-sodium salt product; and (5) separating the liquid, returning to the step three, and continuously evaporating and crystallizing.
Embodiment 2 a method for sun-curing low-sodium salt by using magnesium sulfate subtype brine, which comprises the following steps:
firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, naturally freezing by adopting a salt pan natural overwintering freezing process, controlling the temperature of the brine at-5 ℃, and keeping the temperature for at least 24h to obtain the frozen nitre brine.
Salt pan natural evaporation I: pumping the frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation when the concentration of potassium ions in the evaporation mother liquor A is 30-33 g/L to respectively obtain sodium chloride solid and high-potassium brine; sodium chloride solids are sold as edible salt products.
Performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation when the concentration of magnesium ions in the evaporation mother liquor B is 60-70 g/L to respectively obtain a low-sodium salt semi-finished product and tail brine; and discharging tail bittern.
Fourthly, water washing and screening: mixing the low-sodium salt semi-finished product and frozen nitre brine by 30wt% and screening by 80 meshes, converting a large amount of mixed brine and solid materials passing through standard screen holes into undersize through a screen, and returning to the step II for continuous evaporation and crystallization; the low sodium salt intermediate product is obtained on the screen.
Fifthly, washing, drying and packaging of repulped slurry: preparing slurry of the low-sodium salt intermediate product and frozen nitre brine according to 40wt%, supplementing fresh water according to 10% of the total mass of the system, stirring and washing, placing in a centrifugal machine after 30min, and separating according to a centrifugal separation factor of not less than 1000 to respectively obtain a wet-based low-sodium salt product and a separation liquid; putting the wet-based low-sodium salt product into a roller dryer, drying at intervals, wherein the heating medium is steam or hot air, the heating temperature is 110 +/-2 ℃, the retention time of the material is 120min, the dried material is a low-sodium salt finished product, and packaging to obtain the low-sodium salt product; and (5) separating the liquid, returning to the step three, and continuously evaporating and crystallizing.
Embodiment 3a method for sun-curing low-sodium salt using magnesium sulfate subtype brine, comprising the following steps:
firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, naturally freezing by adopting a salt pan natural overwintering freezing process, controlling the temperature of the brine at-15 ℃, and keeping the temperature for at least 24h to obtain the frozen nitre brine.
Salt pan natural evaporation I: pumping the frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation when the concentration of potassium ions in the evaporation mother liquor A is 33-40 g/L to respectively obtain sodium chloride solid and high-potassium brine; sodium chloride solids are sold as edible salt products.
Performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation when the concentration of magnesium ions in the evaporation mother liquor B is 70-80 g/L to respectively obtain a low-sodium salt semi-finished product and tail brine; and discharging tail bittern.
Fourthly, water washing and screening: mixing the low-sodium salt semi-finished product and frozen nitre brine by 25wt% to obtain slurry, screening by a 70-mesh screen, converting a large amount of slurry-mixing brine and solid materials passing through a standard screen aperture into undersize through the screen, and returning to the step II for continuous evaporation and crystallization; the low sodium salt intermediate product is obtained on the screen.
Fifthly, washing, drying and packaging of repulped slurry: preparing slurry from the low-sodium salt intermediate product and frozen nitre brine according to 35wt%, supplementing fresh water according to 8% of the total mass of the system, stirring and washing, placing in a centrifugal machine after 20min, and separating according to a centrifugal separation factor of not less than 1000 to respectively obtain a wet-based low-sodium salt product and a separation liquid; putting the wet-based low-sodium salt product into a roller dryer, drying at intervals, wherein the heating medium is steam or hot air, the heating temperature is 110 +/-2 ℃, the retention time of the material is 60min, the dried material is a low-sodium salt finished product, and packaging to obtain the low-sodium salt product; and (5) separating the liquid, returning to the step three, and continuously evaporating and crystallizing.
Embodiment 4 a method for sun-drying low-sodium salt using magnesium sulfate subtype brine, comprising the following steps:
firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, naturally freezing by adopting a salt pan natural overwintering freezing process, controlling the temperature of the brine at-10 ℃, and keeping the temperature for at least 24h to obtain the frozen nitre brine.
Salt pan natural evaporation I: pumping the frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation when the concentration of potassium ions in the evaporation mother liquor A is 40-50 g/L to respectively obtain sodium chloride solid and high-potassium brine; sodium chloride solids are sold as edible salt products.
Performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation when the concentration of magnesium ions in the evaporation mother liquor B is 80-85 g/L to respectively obtain a low-sodium salt semi-finished product and tail brine; and discharging tail bittern.
Fourthly, water washing and screening: mixing the low-sodium salt semi-finished product and frozen nitre brine according to 28wt% and screening by a 75-mesh sieve, converting a large amount of mixed brine and solid materials passing through a standard sieve aperture into undersize by the sieve, and returning to the step II for continuous evaporation and crystallization; the low sodium salt intermediate product is obtained on the screen.
Fifthly, washing, drying and packaging of repulped slurry: preparing slurry from the low-sodium salt intermediate product and frozen nitre brine according to 35wt%, supplementing fresh water according to 9% of the total mass of the system, stirring and washing, placing in a centrifugal machine after 25min, and separating according to a centrifugal separation factor of not less than 1000 to respectively obtain a wet-based low-sodium salt product and a separation liquid; putting the wet-based low-sodium salt product into a roller dryer, drying at intervals, wherein the heating medium is steam or hot air, the heating temperature is 110 +/-2 ℃, the retention time of the material is 90min, the dried material is a low-sodium salt finished product, and packaging to obtain the low-sodium salt product; and (5) separating the liquid, returning to the step three, and continuously evaporating and crystallizing.
Example 5 a salt lake brine of the Qinghai Chaaida basin was used as a raw material and had a chemical composition as shown in Table 1.
TABLE 1 chemical composition of brine from certain salt lake in Qinghai Chaaida wood basin
The salt lake brine is subjected to natural saltpeter freezing, salt pan natural evaporation I and salt pan natural evaporation II according to the method, and the process material data are shown in Table 2.
Table 2: process material data
And (3) washing and screening the low-sodium salt semi-finished product obtained by natural evaporation II of the salt pan, then washing with slurry, and drying to obtain a low-sodium salt product salt sample, wherein the salt sample is detected by a national salt product quality supervision and inspection center, and the monitoring data are shown in Table 3.
Table 3: low sodium salt monitoring data
Through detection, the obtained low-sodium salt main content additive (potassium chloride and sodium chloride) and other impurity content, sensory and physical indexes completely reach the requirements of GB2019-2005 standard.
In the natural saltwater freezing process of the saltwater lake brine in the embodiment 1-5, the same low-sodium salt product can be prepared by mechanically and forcibly freezing the saltwater lake brine, wherein the mechanical forced freezing temperature is controlled to be minus 10 ℃ to minus 20 ℃, and the frozen brine is naturally evaporated in a salt pan I, naturally evaporated in a salt pan II, washed and screened, repulped and washed, dried and packaged.
Claims (10)
1. A method for preparing low-sodium salt by using magnesium sulfate subtype brine through sun drying comprises the following steps:
firstly, naturally freezing saltpeter: pumping salt lake raw brine into an overwintering pool, and naturally freezing by adopting a salt pan natural overwintering freezing process to obtain frozen saltpeter brine;
salt pan natural evaporation I: pumping the frozen nitre brine into a salt pan for natural evaporation, and performing solid-liquid separation when the concentration of potassium ions in the evaporation mother liquor A is 25-50 g/L to respectively obtain sodium chloride solid and high-potassium brine; the sodium chloride solid is sold as an edible salt product;
performing natural evaporation in the salt field II: naturally evaporating the high-potassium brine, and performing solid-liquid separation when the concentration of magnesium ions in the evaporation mother liquor B is 50-85 g/L to respectively obtain a low-sodium salt semi-finished product and tail brine; discharging the tail bittern;
fourthly, water washing and screening: mixing the low-sodium salt semi-finished product and the frozen nitre brine according to 20-30 wt% and screening by a 60-80 mesh screen, converting a large amount of mixed brine and solid materials passing through a standard screen aperture into undersize through a screen, and returning to the step for continuous evaporation and crystallization; the medium product of low sodium salt is obtained on the screen;
fifthly, washing, drying and packaging of repulped slurry: preparing slurry from the low-sodium salt intermediate product and the frozen nitre brine according to 30-40 wt%, supplementing fresh water according to 5-10% of the total mass of the system, stirring and washing, and separating after 15-30 min to respectively obtain a wet-based low-sodium salt product and a separation liquid; drying the wet-based low-sodium salt product by a roller dryer and packaging to obtain a low-sodium salt product; and returning the separated liquid to the step three, and continuously evaporating and crystallizing.
2. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: the method comprises the steps of controlling the temperature of brine water to be minus 10 +/-10 ℃ in a freezing process, and keeping the temperature for at least 24 hours.
3. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 2, which is characterized in that: the temperature of the brine is-5 ℃ to-15 ℃.
4. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: the method comprises the following steps of evaporating the potassium ion concentration in the mother liquor A to 33-40 g/L.
5. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: and step three, the concentration of magnesium ions in the evaporation mother liquor B is 80-85 g/L.
6. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: and step four, the proportion of blended slurry is 28-30 wt%.
7. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: and step four, the screening aperture is 60-75 meshes.
8. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: the fresh water adding amount in the step fifthly is 5-8% of the total mass of the system.
9. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: the centrifugal separation factor in the step fife is not lower than 1000.
10. The method for sun-curing low-sodium salt by using magnesium sulfate subtype brine as claimed in claim 1, which is characterized in that: the drying condition of the drum dryer in the step fifthly means that an interval mode is adopted, the heating medium is steam or hot air, the heating temperature is 110 +/-2 ℃, and the material residence time is 30-120 min.
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| CN113185047A (en) * | 2021-05-11 | 2021-07-30 | 四川恒成钾盐科技有限公司 | Method for producing low-sodium salt from potassium-rich brine |
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