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| Experimental on recovery of aluminum from acid leaching solution of low-grade aluminum bearing ore |
| Received:September 26, 2019 Revised:October 22, 2019 |
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| DOI： |
| KeyWord:Low grade aluminum resources; high aluminum-ferric acid solution; ammonium aluminum sulfate dodecahydrate; high purity alumina |
| Author | Institution |
| JIANG Peng |
Kunming University of Science and Technology,State Key Laboratory of Clean and Use of Complex Nonferrous Metal Resources |
| GAO Likun |
Kunming University of Science and Technology,School of Land and Resources Engineering |
| MA Fangtong |
Kunming University of Science and Technology,School of Land and Resources Engineering |
| RAO Bing |
Kunming University of Science and Technology,School of Land and Resources Engineering |
| SHEN Hairong |
Kunming University of Science and Technology,School of Land and Resources Engineering |
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| Abstract: |
| It is of great practical significance to comprehensively recover aluminum from the low-grade aluminum ore wet processing process to realize recycling or high value utilization of low-grade aluminum-containing minerals. The high-aluminum iron leaching solution obtained by leaching low-grade aluminum-containing anatase ore from sulfuric acid was used as the research object, and high-purity Al2O3 was prepared by Precipitation of aluminum by crystallization of ammonium aluminum sulfate—resin adsorbs iron—calcination combined process. The results show that the solution is stirred at 300r/min for 30min under the condition of initial concentration of aluminum ion of 0.70mol/L, NH4+/Al3+ molar ratio of 1.2 and crystallization end point temperature of 20℃ to obtain NH4Al(SO4)2·12H2O crude product, wherein the crystal purity is 95.31%, the aluminum recovery rate is 88.19%, and the inclusion iron content is 1.39%. Then, the crude NH4Al(SO4)2·12H2O product was subjected to iron removal by two recrystallizations and primary resin adsorption, and finally calcined at 1,300 ℃ to obtain Al 2O3 having a purity of 99.99%. |
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