Ammonium magnesium phosphate slow release fertilizer and preparation method thereof

A magnesium ammonium phosphate and slow-release fertilizer technology, which is applied in the field of wastewater treatment and fertilizer preparation, can solve the problems of environmental and groundwater pollution, difficulty in recycling and low ammonium salt concentration, etc., achieves good effects, controls waste utilization, and promotes plant growth. effect of growth

Inactive Publication Date: 2013-02-13
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth smelting and separation wastewater contains a large amount of ammonia nitrogen, phosphorus, magnesium and trace amounts of iron and rare earth ions, causing serious pollution to the environment and groundwater. How to comprehensively treat rare earth smelting wastewater, recycle valuable resources, and protect the ecological environment is an urgent need for the industry to solve important question
At present, high-concentration ammonia nitrogen wastewater is generally recovered by evaporation, concentration and crystallization to obtain high-purity ammonium chloride or ammonium sulfate products, but the recovery rate is low and the recovery cost is high
Low-concentration ammonia-nitrogen wastewater has low concentration of ammonium salts and complex components, making recycling difficult and costly

Method used

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  • Ammonium magnesium phosphate slow release fertilizer and preparation method thereof
  • Ammonium magnesium phosphate slow release fertilizer and preparation method thereof
  • Ammonium magnesium phosphate slow release fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0022] 400mL of raw material 1 composed of waste water containing lanthanum, cerium, magnesium and ammonium and 200mL of raw material 2 composed of waste water containing iron were mixed and reacted for 5min, wherein the content of lanthanum and cerium in raw material 1 was 500mg / L in terms of REO, and then Add waste water (raw material 3) containing sodium phosphate by stoichiometric relationship and make precipitant, adjust the pH of reaction with magnesium hydroxide and ammoniacal liquor to be 8.0, the weight ratio of magnesium ion, ammonium ion and phosphate ion in the reaction solution is Mg 2+ : NH 4 + :PO 4 3- =1.35: 1.00: 5.28, react 300min, make precipitation reaction completely, gained precipitation obtains magnesium ammonium phosphate slow-release fertilizer through aftertreatment, and wherein the sum of REO, Fe, S content is 0.5wt%, P 2 o 5 The N content is 19 wt%, the N content is 3 wt%, and the MgO content is 17%. Ammonia nitrogen content is 45mg / L in the fi...

example 2

[0024] 400mL of raw material 1 composed of wastewater containing magnesium and ammonium and 200mL of raw material 2 composed of wastewater containing titanium were mixed and reacted for 25min, wherein the content of lanthanum, cerium, praseodymium and neodymium in raw material 1 was 1000mg / L in terms of REO, and then Add waste water (raw material 3) containing potassium phosphate by stoichiometric relationship and make precipitant, adjust the pH of reaction with magnesium oxide and alkaline waste water to be 10.0, and the weight ratio of magnesium ion, ammonium ion and phosphate ion in the reaction solution is Mg 2+ : NH 4 + :PO 4 3- =1.45: 1.00: 5.34, react 60min, make precipitation reaction completely, gained precipitation promptly obtains magnesium ammonium phosphate slow-release fertilizer through aftertreatment, and wherein REO, K, Ti, S total content are 1.2wt%, P 2 o 5 The N content is 40.5 wt%, the N content is 5.6 wt%, and the MgO content is 22%. Ammonia nitrogen...

example 3

[0026] Mix 500mL of raw material 1 composed of magnesium sulfate wastewater containing lanthanum and ammonium nitrate wastewater with raw material 2 composed of 450mL of wastewater containing iron sulfate and zinc for 60 minutes, wherein the content of lanthanum in raw material 1 is 1500mg / L in terms of REO , then add waste water (raw material 3) containing potassium phosphate or potassium dihydrogen phosphate or dipotassium hydrogen phosphate according to the stoichiometric relationship as a precipitating agent, and adjust the pH of the reaction with sodium hydroxide alkaline waste water to be 9.5, and magnesium ions in the reaction solution , the weight ratio of ammonium ion and phosphate ion is Mg 2+ : NH 4 + :PO 4 3- =1.7: 1.00: 5.34, react 130min, make precipitation reaction completely, gained precipitation promptly obtains magnesium ammonium phosphate slow-release fertilizer through aftertreatment, and wherein REO, Fe, K, Zn, S total content are 9.95wt%, P 2 o 5 The...

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Abstract

The invention discloses an ammonium magnesium phosphate slow release fertilizer and a preparation method thereof, belonging to the technical field of waste water treatment. The ammonium magnesium phosphate slow release fertilizer contains at least one of potassium, iron, calcium, zinc, titanium and sulfur and a rare earth, wherein the rare earth is counted on the basis of the weight of an rare earth oxide (REO); the sum of the content of at least one of the potassium, iron, calcium, zinc, titanium and sulfur and the content of the REO is 0.01-10 percent by weight; the content of P2O5 is 15-49percent by weight; the content of N is 3-10 percent by weight; and the content of MgO is 16-26 percent by weight. In the preparation method, waste water is taken as a raw material, the ammonium magnesium phosphate slow release fertilizer is provided, so that valuable resources such as nitrogen, phosphorus, rare earth, magnesium and the like in the waste water are effectively recycled at low cost,the problem of waste water pollution is solved, and the valuable resources such as nitrogen, phosphorus, rare-earth, magnesium and the like in the waste water are effectively recycled at low cost.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and fertilizer preparation, in particular to a magnesium ammonium phosphate slow-release fertilizer and a preparation method thereof. Background technique [0002] In recent years, with the rapid increase of population and the reduction of arable land, the contradiction between food supply and demand has intensified, making agricultural production increasingly dependent on fertilizers, all of which highlight the important position of chemical fertilizers in agricultural production. However, a significant contradiction in my country's agricultural production at present is that the input of chemical fertilizers is high but the utilization rate is low, which has also become one of the important factors restricting the development of my country's agriculture. Most of the chemical fertilizers currently used in my country are water-soluble, such as potassium fertilizers, iron fertilizers, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05B17/00
Inventor 黄小卫刘向生张赫龙志奇赵娜伍艳平韩学伟赵凤红
Owner GRIREM ADVANCED MATERIALS CO LTD
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