Method for producing ammonium sulfur and potassium-calcium-silicon fertilizer by using phosphogypsum
A technology of phosphogypsum and ammonium sulfate, applied in ammonium salt fertilizers, chemical instruments and methods, nitrogen fertilizers, etc., can solve the problem that the production process of ammonium sulfate and its potassium calcium and silicon fertilizers has not been reported, and by-product calcium carbonate has not been detailed and economical. It can reduce the decomposition cost, lower the production cost and lower the melting point.
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Embodiment 1
[0031]Add 2kg of ammonium carbonate solution (mass concentration: 25%) and 1kg of dried phosphogypsum (mass ratio: 2:1) into the reactor, set the reaction temperature to 30°C, and stir at a speed of 100 rpm 120min. After the reaction, the slurry is subjected to solid-liquid separation through a filter press. Use sulfuric acid to adjust the pH of the filtrate to 5.6, concentrate and crystallize, and dry to obtain fertilizer-grade ammonium sulfate product; after washing the filter cake with water, it enters the rotary drum heating machine, and passes through the tail gas in the roller kiln to cool the material After heat exchange and drying, the free water and part of the crystallization water of the filter cake are removed, and it can be used as a raw material for the production of potassium calcium silicon fertilizer.
[0032] Mix potassium feldspar and phosphogypsum powder with dry calcium carbonate filter cake in a molar ratio of 1:1:14 (that is, the molar ratio of potassiu...
Embodiment 2
[0034] Add 1.7kg of ammonium carbonate solution (mass concentration: 30%) and 1kg of dried phosphogypsum into the reactor, set the reaction temperature to 40°C, and stir thoroughly for 105min at a speed of 110rpm. After the reaction, the slurry is subjected to solid-liquid separation through a filter press. Use sulfuric acid to adjust the pH of the filtrate to 5.8, concentrate and crystallize, and dry to obtain fertilizer-grade ammonium sulfate product; after washing the filter cake with water, it enters the rotary drum heating machine, and passes through the exhaust gas in the roller kiln to cool the material After heat exchange and drying, the free water and part of the crystallization water of the filter cake are removed, and it can be used as a raw material for the production of potassium calcium silicon fertilizer.
[0035] Mix potassium feldspar and phosphogypsum powder with dry calcium carbonate filter cake in a molar ratio of 1:1:14 (that is, the molar ratio of potassi...
Embodiment 3
[0037] Add 2kg of ammonium carbonate solution (mass concentration: 30%) and 1kg of dried phosphogypsum into the reactor, set the reaction temperature to 45°C, and fully stir for 90min at a speed of 120rpm. After the reaction, the slurry is subjected to solid-liquid separation through a filter press. Use sulfuric acid to adjust the pH of the filtrate to 6.0, concentrate and crystallize, and dry to obtain fertilizer-grade ammonium sulfate product; after washing the filter cake with water, it enters the rotary drum heating machine, and passes through the tail gas in the roller kiln to treat the material After heat exchange and drying, the free water and part of the crystallization water of the filter cake are removed, and it can be used as a raw material for the production of potassium calcium silicon fertilizer.
[0038] Mix potassium feldspar and phosphogypsum powder with calcium sulfate dry filter cake at a molar ratio of 1:1:14 (that is, the molar ratio of potassium feldspar ...
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