Purification and production of inorganic fertilizers in solar ponds
- Universidad Complutense, Madrid (Spain)
The separation of sodium nitrate from caliche and potassium chloride from silvinita, and the obtention of potassium nitrate from double decomposition of sodium nitrate and potassium chloride in aqueous solution, using the differential solubility method, has been treated. The necessary energy for solving salts and heating solutions can be provided by the sun if solar ponds - of caliche, silvinita or a mixture of both ores - are built. It has been found that this solar pond application is feasible, and the cycling pond efficiency could be improved beyond the typical 20% at low operating temperatures. The amount of nitrate or chloride obtained per liter of solution depends on the temperature at the bottom of the pond, the ambient temperature and, especially, on their difference. Finally, pond stability is improved to the higher solubility of the salts used, and the pond of silvinita could be stable even if evolving to a saturation operational pond.
- OSTI ID:
- 6300573
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (USA), Journal Name: Solar Energy (Journal of Solar Energy Science and Engineering); (USA) Vol. 45:1; ISSN SRENA; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140905*
ABSORPTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMBIENT TEMPERATURE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
DECOMPOSITION
DENSITY
DISSOLUTION
EFFICIENCY
ENERGY
EQUIPMENT
FEASIBILITY STUDIES
FERTILIZERS
HALIDES
HALOGEN COMPOUNDS
HEAT
MAGNESIUM COMPOUNDS
MAGNESIUM SULFATES
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PONDS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
PROCESS HEAT
RADIATIONS
SEPARATION PROCESSES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM NITRATES
SOLAR COLLECTORS
SOLAR EQUIPMENT
SOLAR PONDS
SOLAR PROCESS HEAT
SOLAR RADIATION
SOLUBILITY
STELLAR RADIATION
SULFATES
SULFUR COMPOUNDS
SURFACE WATERS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE GRADIENTS