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

A technology of leonite and sodium sulfate, applied in chemical instruments and methods, alkali metal sulfite/sulfite, fertilization devices, etc., can solve problems such as difficulty in processing and separation of leonite, and achieve overcoming the difficulty of separation The effect of large, mild reaction conditions and large elastic range

Inactive Publication Date: 2013-07-03
HEBEI UNIV OF TECH
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  • Description
  • Claims
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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

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Effect test

example 1

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

[0036] (1) 100g of kabeinite (MgSO 4 ·Na 2 SO 44H 2 O), the ammonium sulfate of 55.65g and the water of 176.38g are mixed as system composition M 0 , added to a 500ml three-necked flask, mechanically stirred and reacted in a 25°C constant temperature tank, and after 120min, nitrogen-magnesium compound fertilizer (MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 (0) will crystallize out, and after centrifuging and drying at 80°C in a centrifuge, 105.1g of the nitrogen-magnesium compound fertilizer product can be obtained. The resulting mother liquor is E with a total of 226.7g, and the mother liquor E is Na at 25°C. 2 SO 4 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 O system phase diagram of MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O and Na 2 SO 4 10H 2 O two solid phase common saturated line point, record E is the mother liquor mass percentage content is Na 2 SO 4 , 18.84%; MgSO 4 , 0.3896%; (NH 4 ) 2 SO 4 , 7.536%; H 2 O, 73.23%.

[0037] (2...

example 2

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

[0042] (1) 100g of kabeinite (MgSO 4 ·Na 2 SO 4 4H 2 O), the ammonium sulfate of 72.46g and the water of 326.7g are mixed as system composition N 0 , added to a 1000ml three-necked flask, mechanically stirred in a constant temperature tank at 25°C for reaction, and after 120min, nitrogen-magnesium compound fertilizer (MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 (0) will crystallize out, and after the centrifuge centrifugal treatment dries, just can get nitrogen-magnesium compound fertilizer product 104.5g. The resulting mother liquor is a total of 394.7g of F, and the mother liquor F is Na at 25°C. 2 SO 4 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 O system phase diagram of MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O and Na 2 SO 4 10H 2 O two solid phase co-saturation line points, the measured F mother liquor mass percentage content is 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...

example 3

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

[0048] (1) 100g of kabeinite (MgSO 4 ·Na 2 SO 4 4H 2 O), the ammonium sulfate of 63.70g and the water of 249.7g are mixed as system composition U 0 , added to a 1000ml three-necked flask, mechanically stirred in a constant temperature tank at 25°C for reaction, and after 120min, nitrogen-magnesium compound fertilizer (MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 (0) will crystallize out, and after centrifugal processing and drying in a centrifuge, 104.8g of nitrogen-magnesium compound fertilizer product can be obtained. The resulting mother liquor is Z, a total of 308.6g, and mother liquor Z is Na at 25°C. 2 SO 4 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 O system phase diagram of MgSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 O and Na 2 SO 4 10H 2 O two solid phase co-saturation line points, the measured Z mother liquor mass percentage content is 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 th...

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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 invention relates to a preparation method of sodium sulfate and nitrogen-magnesium compound fertilizer, in particular a process for preparing sodium sulfate and nitrogen-magnesium compound fertilizer from langbeinite. Background technique [0002] Magnesite is a common surface deposit in salt lakes and dry salt lake areas, 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. Inner Mongolia's Alxa League and other places are covered with billions of tons of langbesonite ore. Aiming at the processing and mining of this resource, people have carried out a lot of research as early as 30 years ago. However, because langbeite is a double salt composed of sodium sulfate and magnesium sulfate, it is difficult to process and separate this resource. At present, this resource has not b...

Claims

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Application Information

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Patent Type & Authority Patents(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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