首页|A new enrichment method of medium–low grade phosphate ore with high silicon content
A new enrichment method of medium–low grade phosphate ore with high silicon content
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NSTL
Elsevier
? 2022 Elsevier LtdEnrichment of medium–low grade phosphate ore is very important for phosphorus chemical industry. This paper proposes a new enrichment method of medium–low grade phosphate ore with high silicon content via nitric acid leaching, separation and re-precipitation in sequence. The nitric acid leaching and the precipitation of the leaching solution were investigated and the P2O5 recovery reached 99.82%. The phosphorus in the leaching solution was re-precipitated in the form of phosphate after two stages of mineralization by using calcium carbonate slurry (CaCO3) and lime slurry (CaO) respectively. The effects of pH, reaction time, stirring speed, and temperature on the P2O5 recovery were methodically studied. Taguchi experiment and analysis of variance (ANOVA) showed that the pH and temperature of the reaction had the most significant effects on the P2O5 recovery. The parameters of the first mineralization were determined as follows: pH of 1.6, reaction time of 1 h, stirring speed of 300 rpm and reaction temperature of 45 °C. The P2O5 recovery could reach 99.04% in the total enrichment process after the second mineralization while the pH reached 3.8. The product was precipitated in the form of calcium hydrogen phosphate dihydrate and the P2O5 grade reached 38.24%.
Chemical enrichmentMedium-low grade phosphate oreNitric acid
Wang B.、Zhou Z.、Xu D.、Wu J.、Yang X.、Zhang Z.、Yan Z.
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Ministry of Education Research Center for Comprehensive Utilization and Clean Processing Engineering of Phosphorus Resources College of Chemical Engineering Sichuan University
NSTL
Elsevier
