STUDY OF MATERIAL SYNTHESIS WITH DOLOMITE AND POTASSIUM DIHYDROGEN PHOSPHATE AS RAW MATERIALS FOR POTASSIUM DISSOLUTION TEST IN WATER
The growth of the Indonesian population will make food demand increase. As condition of agriculture area is degrading over by time, fertilizer is used to give nutrition to soil so it can be absorbed by plants. However, intensive fertilizer use will impact the environment badly. High solubility of...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/49102 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The growth of the Indonesian population will make food demand increase. As
condition of agriculture area is degrading over by time, fertilizer is used to give
nutrition to soil so it can be absorbed by plants. However, intensive fertilizer use
will impact the environment badly. High solubility of fertilizer causes the fertilizer
elements to be improperly absorbed by the plants and pollute environment. One of
the solutions for this problem is developing a material that can release potassium as
soil nutrients for delayed and longer time. In this research work, this material is
made from dolomite mineral and potassium dihydrogen phosphate mixture.
Dolomite mineral was obtained from the region of Lamongan, East Java.
A series of tests at atmospheric pressure have been carried out to study the effect of
milling speed, milling time, and ball to powder ratio (BPR) on the potassium
dissolution percentage in water. The product is milled and heated until 600°C. The
effect of milling speed was studied at various speed of 150, 200, and 250 rotation
per minute. The effect of milling time was studied at various times at 4, 6, 8, 12,
16, and 24 hours of milling. Meanwhile, the effect of ball to powder ratio was
studied at BPR variation of 56:1, 28:1, and 14:1. The sample is dissolved in water
for 5760 minutes. The percentages of dissolved K as a function of dissolution time
were determined by Atomic Absorption Spectroscopy (AAS) analysis. XRD (XRay Diffraction) is used to analyse the compound change of the product. SEM
(Scanning Electron Microscope) and FTIR (Fourier Transform Infrared
Spectroscopy) were used for morphology and bonding change analysis.
After milling and heating, the product obtained from the mixture is Potassium
Calcium Pyrophosphate at mixture. SEM analysis result indicates presence of
agglomerates after milling and larger size of agglomerates after heating. Based on
FTIR analysis result, there is intensity peak change after milling and heating.
Potassium dissolution percentage is 39,124% obtained from 24 hours, 250 rpm, and
56:1 BPR milling product. |
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