The effect of partial acidulation of Asphord Rock Phosphate with Sulfuric Acid towards its effectivness.

Acid treatment of phosphate rock, a promising technique for increasing the solubility and thus increase plant uptake of phosphorus is phosphate rock. Partially acidified phosphate rock, by reacting phosphate rock with sulfuric acid Fsfvryk less than what is needed to make triple superphosphate Simple, be prepared. Partially acidified phosphate rock phosphate fertilizers, water soluble than the acid and energy consumption per unit of production per ص P is cheaper. In addition, most of the phosphorus in phosphate rock is slightly more acidic than simple superphosphate. So in some circumstances, partial acidification may be a better way to improve the effectiveness of rock phosphate is imported. So in order to increase the solubility of phosphate rock raw efficiency Vtghlyz Yazd Esfordi by chemical methods (partial acid rock phosphate) were used. An example of igneous phosphate rock concentrate Esfordi Yazd through a flotation methods or crushing process was not an example of a condensed phosphate rock mines in Yazd Esfordi raw form (without any processing) was prepared. Amount of constructive elements and minerals, phosphate rock types were determined by XRD and XRF. In order to assess changes in the solubility of phosphate rocks with acid measured total phosphorus, soluble phosphorus, phosphorus soluble and non-soluble citrate citrate phosphate rock on both types of pre-treatment with acid was performed. Samples of raw phosphate rock and sulfuric acid condensed with three different concentrations of 20.10, and 40% were treated with three replications. To evaluate the effect of temperature on the solubility changes of phosphate rock, phosphate rock, which is half of both samples with different concentrations (20,10 and 40%) were acidified in the oven with a temperature of 75 C and the other half the same was kept in a lab environment. The purpose to investigate the different time Brtghyyrat Tasyrbaz h solubility of phosphate rock, four different time intervals (1, 20.10 and 40 days) after the acid treatment of phosphate rock were selected for sampling. In the interval of 20,10,1, and 40 days after treatment with acid phosphate rock samples at three different concentrations of both acids were maintained at two different temperatures, samples were taken, and three attribute phosphorus soluble in water, soluble citrate and citrate-soluble phosphate rock solubility in comparison to the rate of change was measured. Results showed a main effect of treatment on all three traits phosphorus soluble in water, soluble and non-soluble citrate citrate was significant at the one percent level. Average phosphorus soluble in concentrated samples 12.4 and the raw phosphate rock samples 2.12 percent, respectively. The mean citrate-soluble phosphorus, respectively, for the two samples, 18.5 and 17.1 and for non-soluble phosphate citrate, respectively, 3.67 and 4.02 respectively. The maximum amount of soluble phosphorus in the treated water a day and the amount of soluble phosphorus in the treatment of citrate in the treatment of forty days, ten days were not significant. Citrate-insoluble phosphorus in ten days time is allocated to its highest value. Effect at 25 and 75 C on a water-soluble phosphorus, respectively, 7.7 and 6.8%, for the citrate soluble P 17.3 and 18.3% and for non-soluble phosphate citrate 3.9 and 3.8 percent, respectively. Amounts of water-soluble phosphorus concentrations of 10, 20 and 40% sulfuric acid, respectively, 3.6, 7.6 and 10.6%, for citrate-soluble phosphorus, 21.3, 17.5 and 14% for phosphorus insoluble citrate, respectively, 3.9, 3.78 and 3.8 respectively. Keywords: rock phosphate, sulfuric acid, acidulate