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Method for preparing sodium sulfate and magnesium nitride compound fertilizer by processing astrakhanite

A technology of langbeinite and sodium sulfate, which is applied in chemical instruments and methods, alkali metal sulfite/sulfite, fertilization equipment, etc., can solve the problems of langbeinite processing and separation, and overcome the difficulty of separation The effect of large size, improved economic efficiency and simple process

Inactive Publication Date: 2012-07-18
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the present invention aims at the characteristics that langbeinite is difficult to process and separate, and proposes to directly produce MgSO4 with langbeinite and ammonium sulfate as raw materials. 4 ·(NH 2 ) 2 SO 4 ·6H 2 O compound fertilizer and Na 2 SO 4 The new process, which can easily realize the separation of sodium sulfate and magnesium sulfate in langbeinite, can overcome the shortcomings of traditional magnesium sulfate production that requires evaporation of a large amount of water and high energy consumption, and has the advantage of green energy saving

Method used

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  • Method for preparing sodium sulfate and magnesium nitride compound fertilizer by processing astrakhanite
  • Method for preparing sodium sulfate and magnesium nitride compound fertilizer by processing astrakhanite
  • Method for preparing sodium sulfate and magnesium nitride compound fertilizer by processing astrakhanite

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] Example 1 (see process route figure 1 )

[0036] (1) 100g of magnesia (MgSO 4 ·Na 2 SO 4 ·4H 2 O), 55.65g of ammonium sulfate and 176.38g of water are mixed to form the system composition M 0 , Added to a 500ml three-necked flask, mechanically stirred the reaction in a constant temperature bath at 25℃, after 120min, the nitrogen-magnesium compound fertilizer (MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O) will crystallize out, and after centrifugal treatment and drying at 80℃, 105.1g of nitrogen-magnesium compound fertilizer can be obtained. The obtained mother liquor is 226.7g of E, and the mother liquor E is Na at 25℃ 2 SO 4 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 MgSO of O system phase diagram 4 ·(NH 4 ) 2 SO 4 ·6H 2 O and Na 2 SO 4 ·10H 2 The point on the line where the two solid phases are saturated with O, E is the mass percentage of the mother liquor measured as Na 2 SO 4 , 18.84%; MgSO 4 , 0.3896%; (NH 4 ) 2 SO 4 , 7.536%; H 2 O, 73.23%.

[0037] (2) Add 226.7g of E mother liquor above into a ...

example 2

[0041] Example 2 (see process route figure 1 )

[0042] (1) 100g of magnesia (MgSO 4 ·Na 2 SO 4 ·4H 2 O), 72.46g of ammonium sulfate and 326.7g of water are mixed to form the system composition N 0 , Added to a 1000ml three-necked flask, mechanically stirred the reaction in a constant temperature bath at 25 ℃, after 120min, nitrogen-magnesium compound fertilizer (MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O) will crystallize out, after centrifugal treatment and drying, 104.5g of nitrogen-magnesium compound fertilizer product can be obtained. The mother liquor obtained is F in total 394.7g, the mother liquor F is Na at 25℃ 2 SO 4 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 MgSO of O system phase diagram 4 ·(NH 4 ) 2 SO 4 ·6H 2 O and Na 2 SO 4 ·10H 2 The point on the line where O two solid phases are saturated, the mass percentage of F mother liquor is measured as Na 2 SO 4 , 10.76%; MgSO 4 , 0.2817%; (NH 4 ) 2 SO 4 , 8.654%; H 2 O, 80.30%;

[0043] (2) Add the above 394.7g of F mother liquor into a 1000ml three-...

example 3

[0047] Example 3 (see process route figure 1 )

[0048] (1) 100g of magnesia (MgSO 4 ·Na 2 SO 4 ·4H 2 O), 63.70g of ammonium sulfate and 249.7g of water are mixed to form the system composition U 0 , Added to a 1000ml three-necked flask, mechanically stirred the reaction in a constant temperature bath at 25 ℃, after 120min, nitrogen-magnesium compound fertilizer (MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O) will crystallize out, and after centrifugal treatment and drying in a centrifuge, 104.8g of nitrogen-magnesium compound fertilizer product can be obtained. The obtained mother liquor is Z 308.6g, the mother liquor Z is Na at 25℃ 2 SO 4 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 MgSO of O system phase diagram 4 ·(NH 4 ) 2 SO 4 ·6H 2 O and Na 2 SO 4 ·10H 2 The point on the line where the two solid phases are saturated with O, the mass percentage of Z mother liquor is measured as Na 2 SO 4 , 13.85%; MgSO 4 , 0.3242%; (NH 4 ) 2 SO 4 , 8.212%; H 2 O, 77.61%.

[0049] (2) Add the above 308.6g of Z mother liquor ...

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Abstract

The invention relates to a process for preparing a sodium sulfate and magnesium nitride compound fertilizer by processing astrakhanite, which comprises the following steps of: mixing the astrakhanite, ammonium sulfate with water to form a mixed system; enabling the composition of the mixed system to be on the connecting line of an astrakhanite composition point and an ammonium sulfate compositionpoint of an Na2SO4-MgSO4-(NH4)2SO4-H2O system phase diagram at the temperature of 25 DEG C; then, reacting at the constant temperature of 25 DEG C, and then, separating the magnesium nitride compoundfertilizer by crystallization to obtain a mother solution B; then, adding Na2CO3 to the mother solution B; reacting at the room temperature to separate magnesium carbonate crystal by crystallization to obtain a mother solution C; performing cooling crystallization on the mother solution C at the temperature of 0 DEG C to separate Na2SO4.10H2O crystal by crystallization to obtain a mother solutionD; adding the astrakhanite, the ammonium sulfate and the water to the mother solution D; and reacting at the temperature of 25 DEG C to separate the magnesium nitride compound fertilizer by crystallization. The compositions and the mass percent compositions of the mother solutions meet the composition range of the mother solution B, and the mother solutions can be circularly produced. The processfor preparing the sodium sulfate and magnesium nitride compound fertilizer by processing the astrakhanite has the advantages that no waste liquor or waste residue or waste gas is discharged, generated little magnesium carbonate is also an important chemical raw material, and no environmental pollution is generated.

Description

Technical field [0001] The technical scheme of the present invention relates to a preparation method of sodium sulfate and nitrogen-magnesium compound fertilizer, in particular to a process for preparing sodium sulfate and nitrogen-magnesium compound fertilizer by processing magnesia. Background technique [0002] White magnesite mine is a common surface sediment in salt lakes and dry salt lakes. It is commonly known as nitrate plate or ground nitrate. It is extremely rich in resources and widely distributed in my country. The reserves of salt ponds in Yuncheng, Shanxi alone are more than 20 million tons. In the Alxa League in Inner Mongolia, there are billions of tons of magnesite ore. Regarding the processing and mining of this resource, people have conducted a lot of research as early as 30 years ago. However, because schneiderite is a double salt composed of sodium sulfate and magnesium sulfate, it is difficult to process and separate the resource. Good industrial exploitatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C05G1/00
Inventor 曹吉林郭宏飞张广林李琳杨璐
Owner HEBEI UNIV OF TECH
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