# US 2014/0190226 A1 · Nano-leucite for slow release nitrogen fertilizer and green environment

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- Number: US 2014/0190226 A1
- Document ID: US20140190226A1
- Status: Published application
- Kind: A1
- Application number: 13/738,727
- Filed: 2013-01-10
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Inventors: Muhammad Akhyar Farrukh; Fizza Naseem
- Web page: https://patentgrep.com/patent/US20140190226A1

## CPC

- C05C 1/02: Granulation (apparatus B01J2/00); Pelletisation; Stabilisation; Colouring
- C05C 1/00: Ammonium nitrate fertilisers
- Y02P 60/21: Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
- C05C: NITROGENOUS FERTILISERS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

To compete with the increasing global food demand, it is necessary to increase the food production. Fertilizers which are in practice now a days has major disadvantage that 50% of nutrient contents loss due to leaching and also leads to ground water contamination. Slow release nitrogenous fertilizers are good in this regard in that they have minimum nutrient loss due to leaching. Potassium aluminium silicate (Leucite) nanoparticles occluded by calcium ammonium nitrates are slow release fertilizers and are synthesized by hydrothermal method. Its application as slow released nitrates fertilizers was determined by observing nitrate release for 16 days.

## Claims

### Claim 1

A method for preparing a nanoparticle potassium aluminum silicate and occluding its inner structure with calcium ammonium nitrate to provide a sustained release fertilizer, such method comprising:
a. making a solution consisting of 0.7 to 0.8% sodium dodecyl sulfate, 16.67% of potassium hydroxide and 0.7 to 0.8% aluminum chloride and thoroughly mixing the contents for 10-15 minutes;
b. adding a sufficient quantity of silica in the solution in step a such that the final concentration of silica is 7 to 8%;
c. stirring the mixture in step b for another 20-30 minutes;
d. autoclaving the mixture in step c at 180 C for four hours;
e. cooling the autoclaved material in step d and filtering through filter;
f. washing the filtrate in step e with methanol until pH of the solution becomes neutral;
g. washing the filtrate from step f with distilled water three times;
h. calcining the product from step g at 550 C for three hours;
i. combining one part of the product from step h with 4 parts of ground calcium ammonium nitrate in an alumina crucible;
j. heating the crucible to 160 to 180 C for four hours;
k. cooling down the crucible and transferring the material in crucible to a centrifuge;
l. washing the material with water in the centrifuge operating between 10,000 to 15,000 rpm for 1 minute and repeating the process five times; and
m. air-drying the sample.

### Claim 2 (depends on 1)

The method of claim 1, wherein the nano fertilizer releases nitrogen for at least 16 days continuously.

### Claim 3

A combination of nanoparticles of potassium aluminum silicate wherein the pores are occluded by calcium ammonium nitrate.