Leaching of calcareous phosphate ores using organic acidsThe calcareous and dolomitic gangue material in phosphate ore can be reduced by leaching using both strong inorganic acids and organic acids depending on the process parameters . The selected leaching agents should not attack the phosphate ...
Agitated Leaching. The agitated leaching method is to those ores, or to that portion of those ores, that because of particle size do not permit free passage of leach solution through the interstices between the ore particles and. thus, cannot be effectively treated by heap or vat leaching.
advantages of using orthophosphoric acid as leaching solvent is the decreasing ratio of the residual materials verses marketable P2O5to be589 kg /ton of P2O5 produced. These results were obtained by utilizing the wet agitation leaching technique, compared with 5.0 5.3 ton of disposed PG/ton of P2O5produced by Jordan Phosphate Mines
Activation energy is equal to 14 kJ·mol 1 and values of k L °, at 25°C, are in the range of 0.28 × 10 3 and 4 × 10 3 m·s 1 when the agitation speed goes from 220 to 1030 rpm, showing that the leaching process is controlled by diffusion rather than by chemical reaction.
Abstract Leaching of uranium and REEs with oxalic acid from the Egyptian Abu Tartur phosphate rock was studied. The effect exerted on the leaching process by oxalic acid concentration, agitation time, solid to liquid ratio, and leaching temperature was determined. The leaching kinetics of uranium and REEs were evaluated by the shrinking core model. The uranium and REEs leaching kinetics ...
solutions to leach out the carbonaceous and dolomitic gangue materials from the low grade phosphate rocks. In the acetic acid leaching process, relatively higher liquid/solid ratio and an effective agitation is required to achieve the desired grades of the low grade phosphate rock Higher liquid/solid ratio may result in a relatively
The agitation leaching method is to concentrate the slurry, obtained after grinding and classifying of the gold containing ore, to a suitable concentration, place it in a leaching tank, add a cyanide solution, and aerate to carry out leaching.
Phosphate is usually the limiting nutrient for the formation of algal blooms in freshwater bodies, so tillage practices must minimize phosphate losses by leaching and surface run off from cultivated land.
In the case of calcareous phosphate ores, although mineral acids dissolve carbonates at high reaction rates, they also attack the phosphorus bearing minerals and cause losses in the P 2 O 5 content of the ore; hence, they are not appropriate if the intention is only to beneficiate the ore not to dissolve phosphates. To avoid this problem, organic acids were studied as carbonate leaching agents, although their reaction rates are low.
June 10, 2020
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