Synthesis method for magnesium potassium phosphate slow release fertilizer

A technology of potassium magnesium phosphate and a synthesis method, which is applied to magnesium phosphate fertilizer, ammonium orthophosphate fertilizer, magnesium bisphosphate fertilizer, etc., can solve the problems of long reaction time and technological process, no slow-dissolving property, low product purity, etc., Achieve the effect of high synthesis efficiency, easy operation and high purity

Inactive Publication Date: 2013-08-07
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are literature reports on the synthesis of potassium magnesium phosphate. There are magnesium-containing, potassium-containing mother liquors and phosphoric acid for synthesis by adjusting the temperature and pH several times. Under this condition, the synthesis requires a higher temperature (60-90 ° C), reaction time and The process is long and the operation is cumbersome
There are literatures using potassium salt, magnesium salt and phosphate with a molar ratio of 1:1:1 to synthesize potassium magnesium phosphate under the condition of pH 12-13. Under this condition, magnesium phosphate will be better than potassium magnesium phosphate reaction crystallization, and the product purity is not high. , the resulting product is mainly a mixture of magnesium phosphate and a small amount of potassium magnesium phosphate, and has no slow-dissolving properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] with MgCl 2 Formulated Mg 2+ The molar concentration is 20mmol / L, KCl and KOH are used to prepare K + The molar concentration is 26 mmol / L (the amount of KCl and KOH can be prepared arbitrarily), and KH 2 PO 4 Preparation H 2 PO 4 - The molar concentration is 20mmol / L;

[0024] (1) Take K respectively + 5.0 L of mixed solution of KCl and KOH with a molar concentration of 26 mmol / L and H 2 PO 4 - The molar concentration is 20mmol / L KH 2 PO 4 Mix 5.0 L of the solution, add potassium hydroxide to the solution after mixing, and adjust the pH to 9.0;

[0025] (2) With the mixed solution of step (1), add 5.0 L Mg according to the molar ratio Mg: P=0.6:1.0 2+ The molar concentration is 20mmol / L MgCl 2 solution, and use potassium hydroxide to control the pH at 9.0, and react at 40°C for 10 minutes;

[0026] (3) Solid-liquid separation is carried out after the reaction is completed, and potassium magnesium phosphate is obtained after the precipitate is dried.

[...

Embodiment 2

[0029] with MgSO 4 Formulated Mg 2+ The molar concentration is 32mmol / L, with K 2 SO 4 Formulating K with KOH + The molar concentration is 63mmol / L (K 2 SO 4 and KOH dosage arbitrarily prepared), with H 3 PO 4 Prepare PO 4 3- The molar concentration is 40mmol / L;

[0030] (1) Take K respectively + K with a molar concentration of 63 mmol / L 2 SO 4 , KOH mixed solution 5.0 L and PO 4 3- The molar concentration is 40mmol / L H 3 PO 4 Mix 5.0 L of the solution, add sodium hydroxide to the solution after mixing, and adjust the pH to 10.5;

[0031] (2) With the mixed solution of step (1), add 5.0L Mg according to the molar ratio Mg: P=1.0:1.0 2+ The molar concentration is 32mmol / L MgSO 4 solution, and use sodium hydroxide to control the pH at 10.5, react at 15°C for 30min;

[0032] (3) Solid-liquid separation is carried out after the reaction is completed, and potassium magnesium phosphate is obtained after the precipitate is dried.

[0033] Mg content is 9.29% in ...

Embodiment 3

[0035] With Mg(NO 3 ) 2 Formulated Mg 2+ The molar concentration is 40mmol / L, with KNO 3 Preparation K + The molar concentration is 150mmol / L, with Na 2 HPO 4 Formulated HPO 4 2- The molar concentration is 60mmol / L;

[0036] (1) Take K respectively + KNO with a molar concentration of 150 mmol / L 3 Solution 5.0 L and HPO 4 2- The molar concentration is 60mmol / L Na 2 HPO 4 Mix 5.0 L of the solution, add potassium hydroxide to the solution after mixing, and adjust the pH to 9.5;

[0037] (2) With the mixed solution of step (1), add 6.0 L Mg according to the molar ratio Mg: P=0.8:1.0 2+The molar concentration is 40mmol / L Mg(NO 3 ) 2 solution, and use potassium hydroxide to control the pH at 9.5, and react at 30°C for 20 minutes;

[0038] (3) Solid-liquid separation is carried out after the reaction is completed, and potassium magnesium phosphate is obtained after the precipitate is dried.

[0039] Mg content is 9.20% in the synthesis potassium magnesium phosphate ...

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Abstract

The invention relates to a synthesis method for a magnesium potassium phosphate slow release fertilizer. The synthesis method comprises the following steps of: (1) adding potassium hydroxide or sodium hydroxide in a mixed solution of potassium salt and phosphate, and adjusting the pH value between 9.0 and 10.5, wherein the mole ratio of the potassium salt to the phosphate is 1.0-3.0; (2) adding the mixed solution in the step (1) into a magnesium-containing solution according to the mole ratio that Mg:P=(0.6-1):1, controlling the pH value between 9.0 and 10.5, and reacting at 15-40 DEG C for 10-30min; and (3) carrying out solid-liquid separation after the reaction is ended, and drying a sediment to obtain a magnesium potassium phosphate crystal. The method is simple in process flow and easy to operate; the purity of the synthesized magnesium potassium phosphate is higher; and a clear liquid obtained after the reaction can be still used as the fertilizer after being concentrated, so that the raw material utilization ratio is very high.

Description

technical field [0001] The invention relates to the fields of agriculture, fertilizer technology, chemical industry and environmental engineering, in particular to a synthesis technology of potassium magnesium phosphate, a high-efficiency slow-dissolving fertilizer. Background technique [0002] Potassium is one of the essential macronutrients for plants, which can improve crop results and improve crop resistance to cold and disease. Plants lacking potassium are prone to lodging and are often troubled by bacterial pests, which seriously affects crop yield. Potassium magnesium phosphate is a kind of slow-dissolving potassium fertilizer. It also contains P and Mg necessary for plants. After being applied to the soil, its nutrients will be released slowly. Compared with traditional instant potassium fertilizers (potassium chloride, potassium sulfate and potassium nitrate, etc.) It has good fertilizer efficiency and high nutrient utilization rate, and has broad application prosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B7/00C05B9/00
Inventor 柴源王仁宗刘裕潘春翔王瑞
Owner HUBEI FORBON TECH
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