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Calcium phosphate fertilizer pellets coated with mixtures of wax and nano calcium oxide were studied for release rates of phosphate through the coating. The composition of the coating mixture has been of 0%, 20% and 30% nano-CaCO3 by weight in the wax solution. The pellets were exposed to solutions of pH 4, pH 7 and pH 9.2 in a reactor in an experimental set-up. Trends of release rates with pH were...
In view of the abundant calcium and magnesium ions in sea water, an approach to CO2 capture and sequestration is put forward through enhancing the alkalinity of sea water and increasing the partial pressure of CO2. The purpose of these measures is to increase the concentration of carbonate ion and then accelerate the formation of carbonate precipitation, such as CaCO3 and MgCO3. With the increase...
With powdered converter slag used as a seed crystal, the effects of slag dosage, pH, temperature, and Ca2+ concentration on phosphate removal from synthetic solution through crystallization were investigated in batch experiments. The results indicated that slag concentration of 1.7 g/L, pH value of 9-10, reaction time of 3h , reaction temperature of 20-25°C, Ca/P molar ratio of 2, seemed to be the...
Brushite (CaHPO4·2H2O, dicalcium phosphate dihydrate) is known to be the precursor to the mineralized portion (HA: calcium hydroxyapatite, Ca10(PO4)6(OH)2) of hard tissues in the biological crystallization processes. In other words, it can be readily asserted that there must be a point of equilibrium (within the three-dimensional pH, temperature and concentration space) between brushite and hydroxyapatite...
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