Magnesium sulfate heptahydrate producing process with fully-continuous method

A technology of magnesium sulfate heptahydrate and full continuous method is applied in the technical field of producing magnesium sulfate heptahydrate by full continuous method, and can solve the problems of inability to meet the needs of large-scale industrial production, low efficiency of magnesium sulfate heptahydrate, high labor intensity and the like , to achieve the effect of improving the crystallization effect, reducing the floor space and reducing the labor intensity

Active Publication Date: 2015-03-04
HEBEI NUODA CHEM EQUIP
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  • Claims
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Problems solved by technology

[0003] In industrial production, high-purity magnesite is used as raw material, and lightly burned powder is formed after low-temperature roasting, and magnesium sulfate heptahydrate is produced by soaking in sulfuric acid and cooling and crystallizing in a crystallizer. This process is simple and is adopted by many production units, but Its production process is mostly intermittent. The intermittent production of magnesium sulfate heptahydrate has low efficiency, large land occupation, serious crystallizer wall formation, and high labor intensity. It has become increasingly unable to meet the needs of large-scale industrial production.

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  • Magnesium sulfate heptahydrate producing process with fully-continuous method

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Embodiment 1

[0033] The technique for the production of magnesium sulfate heptahydrate by full continuous method of the present invention, the reactor is composed of three continuous tanks in series to form a continuous leaching tank, including a head tank, a middle tank and a tail tank, the head tank and the tail tank are located at two ends, each tank Conveying devices are built in the bottom, and the upper parts of the head tank, middle tank and tail tank are respectively provided with overflow ports corresponding to the middle tank, tail tank and crystallizer.

[0034]Continuously put lightly burned powder into the tail tank of the continuous leaching tank at a rate of 0.5t / h, and add sulfuric acid solution with a concentration of 80% at a rate of 1.5t / h in the head tank at a rate of 0.6t / h Tap water, steam at a rate of 0.4t / h, the reaction liquid overflowing from the head tank is the leachate, and the temperature of the leachate overflowing from the head tank is maintained at 75°C duri...

Embodiment 2

[0037] The difference between the technique of the fully continuous production of the present embodiment and the embodiment 1 of magnesium sulfate heptahydrate is: in the tail tank of the leaching tank, the lightly burned powder is continuously dropped at a rate of 0.3t / h, and in the head tank at a rate of 1t / h The sulfuric acid solution with a concentration of 70% was introduced at a rate of 0.2t / h, tap water was added, and steam was added at a rate of 0.3t / h to maintain the leachate temperature at 70°C. The magnesium sulfate-containing supernatant obtained after the tail tank reaction had a specific gravity of 1.4 and a pH value of 6.5. The tail tank supernatant is continuously pumped into the DTB crystallizer at a speed of 3.7t / h, and the circulating water at 5°C is used as the cooling source to cool down instantaneously. After cooling, the temperature inside the crystallizer is kept constant at 10°C. The crystal slurry of 3.7t / h is continuously discharged from the crystall...

Embodiment 3

[0039] The difference of the technique and embodiment 1 of the full continuous method production magnesium sulfate heptahydrate of the present embodiment is: in the tail tank of continuous leaching tank, drop into light burnt powder continuously with the speed of 2.2t / h, in head tank with 9t / h Add sulfuric acid solution with a concentration of 55% at a rate of h, add tap water at a rate of 0.6t / h, deliver steam at a rate of 0.8t / h, and maintain the leachate temperature at 90°C. The magnesium sulfate-containing supernatant obtained after the tail tank reaction has a specific gravity of 1.3 and a pH value of 7.5. The tail tank supernatant is continuously pumped into the OSLO crystallizer at a rate of 17.4t / h, and the refrigeration unit is used as the cold source to cool down instantaneously. After cooling, the temperature inside the crystallizer is 22°C and remains constant. The crystal slurry of 32.4t / h is continuously discharged from the crystallizer, and after being dried by ...

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Abstract

The invention provides a magnesium sulfate heptahydrate producing process with a fully-continuous method. The magnesium sulfate heptahydrate producing process with the fully-continuous method comprises continuously adding caustic-burned magnesia powder into the tail tank of a continuous leaching tank; continuously adding sulfuric acid solution, water and steam into the head tank, directly heating the head tank with the steam so as to enable the temperature inside the continuous leaching tank to be stable; controlling the material adding speed to obtain magnesium sulfate supernatant of a certain concentration, specific weight and pH value; continuously sending the supernatant into a crystallizer from the tail tank, continuously and steadily discharging magma through the crystallizer, obtaining magnesium sulfate heptahydrate products after solid-liquid separation, and sending mother liquor back to the head tank of the continuous leaching tank after the separation. The magnesium sulfate heptahydrate producing process with the fully-continuous method has the advantages of small device space occupation, no crystallizer wall attachment, small labor intensity, high utilization rate of magnesium-contained mineral in the caustic-burned magnesia powder and continuous operation capability.

Description

technical field [0001] The invention relates to a production method of magnesium sulfate heptahydrate, in particular to a process for producing magnesium sulfate heptahydrate by a fully continuous method utilizing high-purity magnesite. Background technique [0002] Magnesium Sulfate Heptahydrate (also known as Epsom Salt, MgSO 4 ·7H 2 O) is an important inorganic chemical product, which is widely used in agriculture, medicine, microbial industry, light industry, chemical industry, printing and dyeing industry, pharmaceutical industry, electroplating smelting and other fields. At present, there are two main types of manufacturing processes for magnesium sulfate heptahydrate: one is to use sulfuric acid to react with magnesium-containing minerals; the other is to directly use minerals containing sulfate and magnesium to extract magnesium sulfate heptahydrate. The method for reacting sulfuric acid and magnesium-containing minerals is generally to add sulfuric acid to soak ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40
Inventor 王骞张海春程萍
Owner HEBEI NUODA CHEM EQUIP
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