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Iranian Journal of Chemistry and Chemical Engineering، جلد ۲۵، شماره ۲، صفحات ۴۷-۵۷
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عنوان انگلیسی Effect of Hydrochloric Acid on Leaching Behavior of Calcareous Phosphorites
چکیده انگلیسی مقاله The bulk of the world's phosphate reserves is located in sedimentary horizons that contain appreciable amounts of carbonate. During beneficiation of phosphate rocks, huge amounts of oversize phosphate rocks are rejected from crushers. This reject also mostly contains low tricalcium phosphate and high carbonate content. In this study, experiments have been carried out to reduce/eliminate carbonate content by leaching the ground phosphate rock with dilute hydrochloric acid solution. Effects of hydrochloric acid concentration, reaction time, temperature and liquid/solid ratio (vol./wt. basis) on the process have been studied. Under the reaction conditions, some of the apatite may be dissolved to form soluble monocalcium phosphate during the selective leaching. However, by specifying the pH of the process the lime milk can be used to recover the dissolved apatite. It has been observed that upon treatment of the ground rock with dilute hydrochloric acid, the P2O5 percent can be raised up to the industrially acceptable level due to the selective reduction/elimination of calcium carbonate content of the sample, depending on the reaction conditions as well as nature and size of the raw phosphate particles used for analysis.
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نویسندگان مقاله اقبال ظفر ظفر | iqbal zafar
department of chemistry, bahauddin zakariya university, multan 60800, pakistan

طارق محمود انصاری | tariq mahmood
department of chemistry, bahauddin zakariya university, multan 60800, pakistan

محمد اشرف |
department of chemistry, bahauddin zakariya university, multan 60800, pakistan

محمد امین عابد | mohammad amin
department of chemistry, bahauddin zakariya university, multan 60800, pakistan

نشانی اینترنتی http://www.ijcce.ac.ir/article_8090_91c15d6af19d173be13075ae0b9eeb05.pdf
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