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Volume 6, Issue 4 (Suppl)
J Material Sci Eng, an open access journal
ISSN: 2169-0022
Materials Congress 2017
June 12-14, 2017
June 12-14, 2017 Rome, Italy
Materials Science and Engineering
9
th
World Congress on
Preparation of zeolite for slow-release fertilizer using K-feldspar powder
Jiangyan Yuan
China University of Geosciences, China
T
he 30-50% of crop yields is attributed to the commercial chemical fertilizers according to conservative estimation. Abuse of
chemical fertilizers causes serious contamination and environmental hazards, and very low amount of nutrition is absorbed by
the plants. The utilization of slow release fertilizer can slow down the migration rate of nutritional elements, which is beneficial to the
improvement of fertilizer use efficiency and production, as well as the decrease of soil contamination. The global demand of potash has
exceeded 32 million metric tons of K
2
O in current time and will have a continuous increase in the coming decade potassium-bearing
framework aluminosilicate minerals have been proposed as a substitute source of potassium. As a kind of K-zeolite, zeolite F still
provide K element necessary to the growth of plants and amend soil besides the function of retaining water and nutrition. Synthesis
of F zeolites from K-feldspar is one of the promising applications of K elements in soil. The X-ray diffraction (XRD) patterns of zeolite
F(KALSiO4.1.5 H
2
O) obtained by the hydrothermal method after the fusing of K-feldspar. All of the diffraction peaks can be basically
indexed to the tetragonal phases of zeolite F (JCPDS file 38-0216) as shown in Figure 1a. The strongest peak of zeolite F at 30.17º
is assigned to its (114) crystal plane. We can see the morphology of zeolite F from Figure 1b that presents tetragonal cross-shaped
composed of rectangular sheet. According to the test of water solubility, accumulative release of K
2
O can be fitted by the equation
as follows: y=0.6349-0.0157ln(x-0.994), where y is accumulative release of K
2
O (%) and x is test time (days); and the correlation
coefficient R
2
=0.991. which indicates the release of zeolite F belongs to Elovich equation. By the observation and prediction of Figure
1a, the accumulative release of K
2
O reaches 68.97% after water solubility testing for 42 days, 72.09% for 240 days, and 72.75% for 365
days, respectively, indicating the sample could be used as a long-term slow-release potassium fertilizer with nutrient K
2
O release.
Biography
Jiangyan Yuan has her expertise in Material Science and Engineering. Her research interests consist of comprehensive utilization and green processing of
mineral resources, such as hydrothermal leaching of valuable elements, hydrothermal synthesis of zeolite; crystal structure transformation; and preparation and
characterization of nano-materials as well as their application.
yuanjy0609@163.comJiangyan Yuan, J Material Sci Eng 2017, 6:4(Suppl)
DOI: 10.4172/2169-0022-C1-068