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Method for producing magnesium ammonium phosphate composite fertilizer

A kind of ammonium magnesium phosphate and a production method technology, applied in the direction of magnesium phosphate fertilizer, ammonium orthophosphate fertilizer, magnesium bisphosphate fertilizer, etc., can solve the problem of no large-scale production of ammonium magnesium phosphate compound fertilizer, etc., to prevent waste of resources, The effect of increasing economic benefits and improving economic benefits

Active Publication Date: 2009-06-17
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Langfang District Chemical Research Institute of Hebei Province used heavy alkali to filter mother liquor and extracted phosphoric acid from common calcium to produce magnesium ammonium phosphate; East China Liding University developed a new process for preparing MgNH4PO4 by wet method; 4 PO 4 The reaction system has carried out the phase equilibrium measurement, but the ammonium magnesium phosphate compound fertilizer does not all have large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] take 1 # Slag 100g, add appropriate amount of water, at room temperature, according to the stoichiometric ratio of Mg 2+ :PO4 3- : NH4 + =1~1.2:1:1 conditions, then add magnesium oxide and ammonia water in order, adjust and control the pH value of the solution to 8.0~10.0 with sodium hydroxide, and react for not less than 60 minutes. After the reaction, carry out solid-liquid separation, solid It is ammonium magnesium phosphate product, which contains 5.2% nitrogen, 15.1% magnesium oxide, and 28.5% phosphorus pentoxide. The utilization rate of phosphorus in the slag is 93%, and the utilization rate of magnesium is 97%. The filtrate water is returned and added to the raw material slag recycling.

Embodiment 2

[0017] take 1 # Slag 100g, add appropriate amount of water, at room temperature, according to the stoichiometric ratio of Mg 2+ :PO4 3- : NH4 + =1~1.2:1:1 conditions, then add magnesium hydroxide and ammonia water in order, adjust and control the pH value of the solution to 8.0~10.0 with ammonia water, and react for no less than 60 minutes. After the reaction, carry out solid-liquid separation, and the solid is Magnesium ammonium phosphate product, which contains 5.1% nitrogen, 15.3% magnesium oxide, and 28.4% phosphorus pentoxide. The utilization rate of phosphorus in the slag is 94%, and the utilization rate of magnesium is 97%. The filtrate water is returned and added to the raw material slag Recycling.

Embodiment 3

[0019] take 1 # Slag 100g, add appropriate amount of water, at room temperature, according to the stoichiometric ratio of Mg 2+ :PO4 3- : NH4 + =1~1.2:1:1 condition, then add magnesium carbonate and ammoniacal liquor in sequence, adjust and control the pH value of the solution to 8.0~10.0 with magnesium carbonate, react for not less than 60 minutes, after the reaction finishes, carry out solid-liquid separation, the solid is Magnesium ammonium phosphate product, which contains 5.2% nitrogen, 15.0% magnesium oxide, and 28.8% phosphorus pentoxide. The utilization rate of phosphorus in the slag is 94%, and the utilization rate of magnesium is 97%. The filtrate water is returned and added to the raw material slag Recycling.

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Abstract

The invention relates to a method for producing an ammonium magnesium phosphate compound fertilizer, which comprises: taking phosphorus-magnesium waste residue generated during wet-method phosphoric acid refining as a raw material, and adding a small amount of compounds containing Mg<2+> to make up for the deficiency of magnesium in the waste residue; adding ammonia water, taking an alkaline solution as an acidity regulator, and performing mixing and stirring reaction at room temperature, wherein the reaction time is not less than 60 minutes, the stoichiometric mol ratio of the Mg<2+> to NH4<+> to PO4<3-> in the mixed reaction liquid is 1-1.2:1:1, and the pH value of the reaction liquid is controlled to be between 8.0 and 10.0; and performing solid-liquid separation, wherein solid material is the ammonium magnesium phosphate compound fertilizer containing phosphorus, ammonia and magnesium. By adoption of the method to prepare the ammonium magnesium phosphate compound fertilizer, the economic benefit can be increased; the wet-method phosphoric acid refining cost can be reduced; resource waste can be prevented; and the economic benefit can be improved.

Description

technical field [0001] The invention relates to a production method of magnesium ammonium phosphate compound fertilizer produced from waste residue after wet-process phosphoric acid refining. Background technique [0002] Magnesium ammonium phosphate is a nitrogen (N5.5%), phosphorus (P 2 o 5 27.5%), magnesium (Mg0.15%) multi-element compound fertilizer, and all the ingredients are effective, the solubility in water is extremely low, and because of its citric acid solubility, nitrogen can be stored in the soil after application. Domestic research and production of magnesium ammonium phosphate started relatively late, so far, no industrialization reports have been seen. Since the 1980s, many universities and scientific research institutions have conducted research on the process of preparing magnesium ammonium phosphate. Langfang District Chemical Research Institute of Hebei Province used heavy alkali to filter mother liquor and extracted phosphoric acid from common calciu...

Claims

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Application Information

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IPC IPC(8): C05B21/00C05B7/00C05B9/00
Inventor 杜建侠李红舒龙汤明友
Owner HUBEI XINGFA CHEM GRP CO LTD
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