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Study on Leaching of Rare Earth in Preparing Phosphoric Acid with Nitric Acid

Denggao Zhang

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Abstract

The leaching of rare earth(RE) in phosphate rock with nitric acid was studied.The effects of temperature,nitric acid concentration,time,particle size,and liquid-to-solid ratio on RE leaching rate were studied.The optimum conditions for RE leaching were 40% HNO3,60 ℃,liquid-to-solid ratio 2.5,agitation speed 300 r/min,-0.038 mm accounting for 82%,leaching time 90 min.Under the above conditions,the percentage of RE leaching rate and decomposition percentage of phosphate rock were both higher than 98%.

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What this paper is about

The leaching of rare earth(RE) in phosphate rock with nitric acid was studied.The effects of temperature,nitric acid concentration,time,particle size,and liquid-to-solid ratio on RE leaching rate were studied.The optimum conditions for RE leaching were 40% HNO3,60 ℃,liquid-to-solid ratio 2.5,agitation speed 300 r/min,-0.038 mm accounting for 82%,leaching time 90 min.Under the above conditions,the percentage of RE leaching rate and decomposition percentage of phosphate rock were both higher than 98%.

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Available abstract

The leaching of rare earth(RE) in phosphate rock with nitric acid was studied.The effects of temperature,nitric acid concentration,time,particle size,and liquid-to-solid ratio on RE leaching rate were studied.The optimum conditions for RE leaching were 40% HNO3,60 ℃,liquid-to-solid ratio 2.5,agitation speed 300 r/min,-0.038 mm accounting for 82%,leaching time 90 min.Under the above conditions,the percentage of RE leaching rate and decomposition percentage of phosphate rock were both higher than 98%.

Key concepts: Nitric acid, Leaching (pedology), Phosphoric acid, Chemistry, Rare earth, Particle size, Phosphate, Nuclear chemistry

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