Journal
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
Volume 43, Issue 1, Pages 22-27Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/08827508.2020.1806834
Keywords
Sedimentary phosphate ore; reverse flotation; flotation depressants; sodium tripolyphosphate
Funding
- Russian Science Foundation [1917-00096]
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This work aimed to upgrade a low-grade sedimentary phosphate ore through attrition scrubbing/desliming and an anionic/cationic reverse flotation technique. The results showed that using the optimized conditions, a high grade and recovery of P2O5 were achieved in the coarse size fraction through attrition scrubbing accompanied by desliming. Cationic reverse flotation was found to be more desirable in terms of achieving a high grade and recovery of P2O5 compared to anionic reverse flotation.
This work aimed to upgrade a low-grade sedimentary phosphate ore through attrition scrubbing/desliming and an anionic/cationic reverse flotation technique. The mineralogical and chemical examination showed that the sample contained low-grade apatite minerals (P2O5 similar to 22.5%), and the main associated gangue minerals were gypsum and quartz. The effects of both collector and depressant dosage were investigated and optimized in each individual flotation process. The results of attrition scrubbing accompanied by desliming showed that a high content of P2O5 (27.97%) with a recovery of 72.1% was obtained in the coarse size fraction (+53 mu m), and the majority of quartz and gypsum separated in the fine size fraction (-53 mu m). The effect of using a new tall oil collector mixture was investigated during the anionic reverse flotation. Sodium tripolyphosphate (STPP) was used as a phosphate depressant during anionic and cationic reverse flotation. The flotation results of the deslimed sample demonstrated that cationic reverse flotation was much more desirable in terms of achieving a high grade and recovery of P2O5 compared to anionic reverse flotation. Considering the statistical design, a maximum grade of 31.23% P2O5 with a recovery of 95.22% was obtained in the non-floated fraction using 950.88 g/t of the collector (amine) and 500 g/t of the STPP.
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