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Method for preparing nitro phosphate containing medium trace elements and polyphosphate
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A medium and trace element, polyphosphate technology, applied in the direction of ammonium nitrate fertilizer, ammonium salt fertilizer, nitrogen fertilizer, etc., can solve the problems of high energy consumption, strict conditions, unfavorable energy saving and emission reduction, etc., to promote crop growth, chemical properties The effect of stabilizing and improving the absorption utilization rate
Inactive Publication Date: 2016-08-17
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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Also discloses the method for preparing nitrophosphate fertilizer at the same time, comprises the following steps: (1) digest apatite with nitric acid, (2) crystallize, filter calcium nitrate, (3) neutralize with ammonia, (4) evaporate, wherein the evaporation process reduces the evaporation rate. The pressure makes the water content less than or equal to 1%, while optionally increasing the temperature of step (4), optionally controlling the temperature of crystallization step (2) so as to generate polyphosphate, optionally adding potassium after step (4); prior art The chemical reaction of ammonium polyphosphate can only be produced under negative pressure, the conditions are relatively strict, and the energy consumption is high, which is not conducive to achieving the purpose of energy saving and emission reduction. This technology has not disclosed the reasonable application of medium and trace elements to nitrophosphate fertilizer products. At the same time, the polymerization degree and polymerization rate of ammonium polyphosphate in the product can be guaranteed and the efficacy of medium and trace elements can be guaranteed. Because medium and trace elements are easy to react with phosphate and make phosphate invalid
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Embodiment 1
[0047] Embodiment 1 contains the preparation of the nitrophosphate fertilizer A of middle trace element and polyphosphate
[0048] A preparation method of nitrophosphate fertilizer containing medium and trace elements and polyphosphate, comprising the following steps:
[0049] (1) Digest 100kg of apatite with 10kg of nitric acid;
[0050] (2) further acidolysis with 10kg ammonium sulfate, precipitate calcium ion;
[0051] (3) freeze crystallization, separate calcium sulfate;
[0052] (4) neutralize mother liquor to pH6.8 with ammonia;
[0053] (5) The pressure is reduced to below -0.05MPa for evaporative concentration, and the concentrated water content is 0.8% by weight;
[0054] (6) Add 5kg of nano-materials of trace elements (1kg nano-silicon dioxide, 1kg nano-diatomaceous earth, 1kg nano-magnesium basic carbonate, 2kg nano-zincoxide), the temperature is 170°C, pressurize to above 101.32kPa to polymerize React, react for 2 hours to generate polyphosphate, and then gran...
Embodiment 2
[0055] Embodiment 2 The preparation of the nitrophosphate fertilizer B containing medium and trace elements and polyphosphate
[0056] A preparation method of nitrophosphate fertilizer containing medium and trace elements and polyphosphate may also include the following steps:
[0057] (1) digest 150kg apatite with 10kg nitric acid;
[0058] (2) further acidolysis with 10kg sulfuric acid, precipitation calcium ion;
[0059] (3) freeze crystallization, separate calcium sulfate;
[0060] (4) neutralizing mother liquor with ammonia to pH is 6.5;
[0061] (5) The pressure is reduced to below -0.05MPa for evaporative concentration, until the water content is 1% by weight;
[0062] (6) The temperature is 175°C, pressurized to a pressure above 150kPa to undergo a polymerization reaction, and react for 2 hours to generate polyphosphate;
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Abstract
The invention discloses a method for preparing nitro phosphate containing trace elements and polyphosphate. The method comprises the steps of (1) digestion with nitric acid; (2) further acid hydrolysis with phosphoric acid or sulfate; (3) the separation of calciumsulfate precipitate; (4) neutralization with ammonia. The method also comprises the steps of reducing the pressure to be lower than 0.05 MPa, evaporating, and concentrating till the water content of a product is smaller than or equal to 2% by weight; adding the material of medium trace elements, heating till the temperature reaches over 170 DEG C, increasing the pressure till the pressure is larger than the atmospheric pressure, and subjecting the product to polymerization reaction to produce a polyphosphate; granulating again to obtain the nitro phosphate containing medium trace elements and the polyphosphate. According to the technical scheme of the invention, the defect in the prior art that the conventional nitro phosphate only contains NPK components can be overcome. Medium trace elements are added before the towergranulation step, wherein the medium trace elements are composed of one or a combination of calcium, magnesium, silicon, zinc, and the like.
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