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Ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts and preparation method thereof

A technology of magnesium ammonium phosphate and slow-release fertilizer, which is applied to the field of magnesium-ammonium phosphate slow-release fertilizer containing rare earth double salt and its preparation, can solve the problems of difficult recycling, low concentration of ammonium salt, complex composition, etc., and achieves control of waste. The effect of utilizing, controlling and reducing environmental pollution

Inactive Publication Date: 2011-11-23
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 sustained-release fertilizer containing rare-earth complex salts and preparation method thereof
  • Ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts and preparation method thereof
  • Ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Mix the magnesium sulfate waste liquid containing lanthanum, cerium, and praseodymium with the ammonium sulfate waste liquid according to the stoichiometric relationship, wherein the content of lanthanum, cerium, and praseodymium is 500 mg / L in terms of REO, and the pH is controlled at 2. After reacting for 5min, add waste liquid containing sodium phosphate (raw material 3) as precipitant, and the weight ratio of magnesium ion, ammonium ion and phosphate ion in the reaction solution is Mg 2+ : NH 4 + :PO 4 3- =1.35: 1.00: 5.28, adjust the pH of the reaction system with magnesium hydroxide and ammonia water to be 8.2, stir for 300min, and make the precipitation reaction complete, and the resulting precipitate can be treated to obtain the magnesium ammonium phosphate buffer containing rare earth ammonium sulfate and rare earth sodium sulfate double salt. Release fertilizer, wherein the rare earth compound salt content (calculated by REO, the same below) is 0.80wt%.

Embodiment 2

[0015] According to the stoichiometric relationship, the magnesium sulfate waste liquid containing lanthanum, cerium, praseodymium, neodymium, and samarium is mixed with the ammonium chloride waste liquid evenly, wherein the content of lanthanum, cerium, praseodymium, neodymium, and samarium is 150 mg / L in terms of REO. pH is 3.8, after reacting at room temperature for 120min, add waste liquid containing potassium phosphate, potassium dihydrogen phosphate and dipotassium hydrogen phosphate (raw material 3) as a precipitating agent, adjust the pH of the reaction system to 9 with magnesium oxide and sodium hydroxide, 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, stir 100min, make precipitation reaction completely, gained precipitation promptly obtains the magnesium ammonium phosphate slow-release fertilizer containing rare earth ammonium sulfate and rare earth potassium sulfate double s...

Embodiment 3

[0017] Mix the magnesium chloride waste liquid containing lanthanum and the ammonium nitrate waste liquid evenly according to the stoichiometric relationship, wherein the content of lanthanum is 50mg / L in terms of REO, control the pH to 3.5, react at 50°C for 60min, and then add diammonium hydrogen phosphate The waste liquid (raw material 3) is made precipitating agent, is 8.5 with sodium hydroxide waste water adjustment reaction system pH, and the weight ratio of magnesium ion, ammonium ion and phosphate ion in the reaction solution is Mg 2+ : NH 4 + :PO 4 3- =1.5: 1.00: 5.34, stirring and reacting for 10min, the precipitation reaction is complete, and the gained precipitation is post-treated to obtain the magnesium ammonium phosphate slow-release fertilizer containing rare earth ammonium nitrate double salt, wherein the rare earth double salt content is 0.19wt%.

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Abstract

The invention discloses an ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts and a preparation method thereof, and belongs to the technical field of fertilizer preparation. The sustained-release fertilizer contains rare-earth complex salts; the content of the rare-earth complex salts is 0.01 to 5.0 weight percent based on rare-earth oxides (REO); and the rare-earth complex salts are at least one of rare-earth complex sulfate, rare-earth complex carbonate, rare-earth complex nitrate and rare-earth complex oxalate. The preparation method comprises the following steps of: premixing waste solution containing rare-earth ions, magnesium ions and ammonium ions and waste solution containing at least one kind of ions of sulfate radical, nitrate radical, carbonate radical and oxalate radical, regulating the pH to be between 1 and 4.5, adding waste solution containing phosphate radical ions after reacting, regulating the pH to be between 8 and 11 by using an alkali substance, and performing post treatment on the sediment obtained by the reaction to obtain the ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts. The ammonium magnesium phosphate sustained-release fertilizer containing the rare-earth complex salts is prepared by using rare-earth industrial waste water and other industrial waste water, so that beneficial elements such as rare earth, nitrogen, phosphorus and the like are slowly released, and the utilization efficiency of the fertilizer is improved.

Description

technical field [0001] The invention belongs to the technical field of fertilizer preparation, in particular to a magnesium ammonium phosphate slow-release fertilizer containing a rare earth double salt and a preparation method thereof. Background technique [0002] The agricultural use of rare earths is an emerging discipline that has achieved significant development in the past 30 years. my country is rich in rare earth resources. In-depth research has been carried out on the agricultural use of rare earths, the environmental chemical and ecological effects of rare earths, and the safety, toxicology and hygiene evaluation of rare earths for agricultural use. The results show that rare earths are not only environmentally friendly, non-toxic and harmless, but also have good effects on regulating plant growth, enhancing plant resistance to drought and disease, and increasing yield. With the popularization and application of rare earths in agriculture, it is very necessary to ...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05B17/00
Inventor 龙志奇黄小卫刘向生张赫赵娜伍艳平韩学伟赵凤红
Owner GRIREM ADVANCED MATERIALS CO LTD
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