CN110862102A - Novel process for producing magnesium sulfate - Google Patents
Novel process for producing magnesium sulfate Download PDFInfo
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- CN110862102A CN110862102A CN201810994630.3A CN201810994630A CN110862102A CN 110862102 A CN110862102 A CN 110862102A CN 201810994630 A CN201810994630 A CN 201810994630A CN 110862102 A CN110862102 A CN 110862102A
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- humidified
- magnesium sulfate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
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- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a new process for producing magnesium sulfate, which comprises the following steps: s1, adding a sulfuric acid solution with the mass concentration of 90% into the magnesium hydroxide, fully reacting, adding a reinforcing agent, and uniformly mixing to obtain a product A; s2, simultaneously introducing the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air into an atomizing nozzle, wherein the atomizing nozzle is arranged at the upper part of the closed reactor, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air are simultaneously introduced into an inner channel and an outer channel of the atomizing nozzle, and the product A is introduced into a middle channel of the atomizing nozzle; in the outer space of the nozzle of the atomizing nozzle, the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air rapidly react to generate a product B; s3, filtering, drying, crushing and sieving the product B to obtain the magnesium sulfate. The method for preparing the magnesium sulfate is different from other processes, and the prepared product has high yield, high purity and short preparation period.
Description
Technical Field
The invention relates to a new process for producing magnesium sulfate.
Background
Magnesium sulfate can be used as leather, explosive, paper, porcelain, fertilizer, and medical oral cathartic. Magnesium sulfate is used in agriculture as a fertilizer because magnesium is one of the main components of chlorophyll. Are commonly used for potted plants or crops that are deficient in magnesium, such as tomatoes, potatoes, roses, and the like. Magnesium sulfate has the advantage of higher solubility than other fertilizers. Magnesium sulfate is also used as bath salt. Magnesium sulfate, or anhydrous magnesium sulfate, is a magnesium-containing compound, and anhydrous magnesium sulfate is a common chemical reagent and a drying reagent, but magnesium sulfate is usually magnesium sulfate heptahydrate, is white fine inclined or inclined column-shaped crystal, has no odor and bitter taste, and is clinically used for catharsis, cholagogic, anticonvulsant, eclampsia, tetanus, hypertension and other diseases.
The magnesium sulfate is generally prepared by using magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesia and the like as raw materials and adding sulfuric acid for decomposition or neutralization. Or taking the byproduct of potassium chloride production as a raw material, mixing the byproduct with the magnesium-containing mother liquor after bromine production in proportion, cooling, crystallizing and separating to obtain crude magnesium sulfate, heating, filtering, removing impurities, cooling and crystallizing to obtain the industrial magnesium sulfate. Or heating bittern for concentration, crystallizing, and separating to obtain magnesium oxide and gypsum suspension, and carbonizing to obtain the final product.
The product prepared by the conventional method has low yield, insufficient purity and long preparation period, and can not completely meet the use requirement.
Disclosure of Invention
The invention provides a defect to be solved by the technical problem and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
a new process for producing magnesium sulfate comprises the following steps:
s1, adding a sulfuric acid solution with the mass concentration of 90% into the magnesium hydroxide, fully reacting, adding 2-5% of a reinforcing agent with the mass fraction of 2-5% into the sulfuric acid solution, and uniformly mixing to obtain a product A;
s2, simultaneously introducing the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air into an atomizing nozzle, wherein the atomizing nozzle is arranged at the upper part of the closed reactor, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air are simultaneously introduced into an inner channel and an outer channel of the atomizing nozzle, and the product A is introduced into a middle channel of the atomizing nozzle; in the outer space of the nozzle of the atomizing nozzle, the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air rapidly react to generate a product B;
s3, filtering, drying, crushing and screening the product B to obtain magnesium sulfate; the enhancer is prepared by mixing 5-10 parts by mass of adipic acid, 5-10 parts by mass of sodium citrate and 10-15 parts by mass of dolomite.
Further, after the product A is obtained in step S1, a modifier is added to the solution to perform a surface modification treatment so that the surface of the resulting MgSO4 powder is hydrophobic.
Further, the modifier is phosphate, and the added mass percentage is 2-5%.
Further, in the process of preparing the slurry, the reaction temperature in the absorption tower is 25-30 ℃.
The invention has the following beneficial effects:
the method comprises the steps of introducing cooled and humidified SO2 gas and cooled and humidified oxidation air during reaction, wherein when SO2 reacts with prepared magnesium hydroxide, gaseous SO2 is firstly dissolved in water to be a physical absorption process, according to a double-mode theory, the transfer resistance of SO2 is mainly an air film and a liquid film between air and liquid interfaces, the diffusion constant of SO2 gas phase is far larger than that of liquid phase, and the main migration force of SO2 is mainly concentrated on the liquid film, SO that the liquid film resistance can be overcome by increasing the liquid-gas ratio, namely the absorption rate of SO2 is improved by humidification, the humidification principle of the oxidation air is similar to that of the oxidation air, and therefore, in order to improve the absorption rate and the reaction rate of SO2, the SO2 gas is cooled and humidified; the method for preparing the magnesium sulfate is different from other processes, and the prepared product has high yield, high purity and short preparation period.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Examples
A new process for producing magnesium sulfate comprises the following steps:
s1, adding a sulfuric acid solution with the mass concentration of 90% into the magnesium hydroxide, fully reacting, adding 2-5% of a reinforcing agent with the mass fraction of 2-5% into the sulfuric acid solution, and uniformly mixing to obtain a product A;
s2, simultaneously introducing the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air into an atomizing nozzle, wherein the atomizing nozzle is arranged at the upper part of the closed reactor, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air are simultaneously introduced into an inner channel and an outer channel of the atomizing nozzle, and the product A is introduced into a middle channel of the atomizing nozzle; in the outer space of the nozzle of the atomizing nozzle, the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air rapidly react to generate a product B;
s3, filtering, drying, crushing and screening the product B to obtain magnesium sulfate; the enhancer is prepared by mixing 5-10 parts by mass of adipic acid, 5-10 parts by mass of sodium citrate and 10-15 parts by mass of dolomite.
In this example, after the product A was obtained in step S1, a modifier was added to the solution to modify the surface of the solution so that the resulting MgSO4 powder was hydrophobic.
In the embodiment, the modifier is phosphate, and the added mass percentage is 2-5%.
In the embodiment, in the slurry preparation process, the reaction temperature in the absorption tower is 25-30 ℃.
The method comprises the steps of introducing cooled and humidified SO2 gas and cooled and humidified oxidation air during reaction, wherein when SO2 reacts with prepared magnesium hydroxide, gaseous SO2 is firstly dissolved in water to be a physical absorption process, according to a double-mode theory, the transfer resistance of SO2 is mainly an air film and a liquid film between air and liquid interfaces, the diffusion constant of SO2 gas phase is far larger than that of liquid phase, and the main migration force of SO2 is mainly concentrated on the liquid film, SO that the liquid film resistance can be overcome by increasing the liquid-gas ratio, namely the absorption rate of SO2 is improved by humidification, the humidification principle of the oxidation air is similar to that of the oxidation air, and therefore, in order to improve the absorption rate and the reaction rate of SO2, the SO2 gas is cooled and humidified; the method for preparing the magnesium sulfate is different from other processes, and the prepared product has high yield, high purity and short preparation period.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The new process for producing the magnesium sulfate is characterized by comprising the following steps of:
s1, adding a sulfuric acid solution with the mass concentration of 90% into the magnesium hydroxide, fully reacting, adding 2-5% of a reinforcing agent with the mass fraction of 2-5% into the sulfuric acid solution, and uniformly mixing to obtain a product A;
s2, simultaneously introducing the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air into an atomizing nozzle, wherein the atomizing nozzle is arranged at the upper part of the closed reactor, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air are simultaneously introduced into an inner channel and an outer channel of the atomizing nozzle, and the product A is introduced into a middle channel of the atomizing nozzle; in the outer space of the nozzle of the atomizing nozzle, the product A, the cooled and humidified SO2 gas and the cooled and humidified oxidizing air rapidly react to generate a product B;
s3, filtering, drying, crushing and screening the product B to obtain magnesium sulfate; the enhancer is prepared by mixing 5-10 parts by mass of adipic acid, 5-10 parts by mass of sodium citrate and 10-15 parts by mass of dolomite.
2. The process of claim 1, wherein after the product A is obtained in step S1, a modifier is added to the solution to modify the surface of the product A, so that the surface of the product MgSO4 is hydrophobic.
3. The novel process for producing magnesium sulfate as claimed in claim 2, wherein the modifier is phosphate, and the mass fraction of the phosphate is 2-5%.
4. The novel process for producing magnesium sulfate according to claim 1, wherein the reaction temperature in the absorption tower is 25-30 ℃ in the process of preparing the slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810994630.3A CN110862102A (en) | 2018-08-28 | 2018-08-28 | Novel process for producing magnesium sulfate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810994630.3A CN110862102A (en) | 2018-08-28 | 2018-08-28 | Novel process for producing magnesium sulfate |
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| CN110862102A true CN110862102A (en) | 2020-03-06 |
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| CN201810994630.3A Pending CN110862102A (en) | 2018-08-28 | 2018-08-28 | Novel process for producing magnesium sulfate |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649230A (en) * | 2015-03-12 | 2015-05-27 | 宁波大学 | Method for preparing sodium hydride powder |
| CN106379926A (en) * | 2016-09-29 | 2017-02-08 | 西安建筑科技大学 | Method for preparing nano calcium sulfate |
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2018
- 2018-08-28 CN CN201810994630.3A patent/CN110862102A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649230A (en) * | 2015-03-12 | 2015-05-27 | 宁波大学 | Method for preparing sodium hydride powder |
| CN106379926A (en) * | 2016-09-29 | 2017-02-08 | 西安建筑科技大学 | Method for preparing nano calcium sulfate |
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Application publication date: 20200306 |
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