Numerous researchers have addressed the complexity of the direct flotation separation of apatite from low-grade phosphate ore. The majority of these studies were limited to the micro-flotation scale. In fact, there is no warranty that a reagent scheme that showed a direct flotation of apatite at a micro-flotation scale on pure minerals would automatically replicate the same expected results on the natural ore in the mechanical flotation cell and so was the case for the phosphate ore studied. The overall trend was concentrating apatite in the non-float product. This study aspired to thoroughly assess the flotation performance of this never-exploited low-grade sedimentary phosphate using design of experiments (DOE). Unveiling new insights on such a strategy twist, various parameters and operating conditions, namely, desliming, type of collector and depressant, reagents dosages, conditioning times, flotation time, and pH, were addressed by multiple-factor screening using asymmetrical fractional factorial design followed by statistical interpretations. The collectors tested were the sodium oleate and a fatty acid mixture (FAM). The depressants tested were sodium alginate (NaAL), corn starch, carboxymethylcellulose (CMC), and sodium silicate. The results of the multivariable analysis revealed that desliming, pH, collector dosage, and flotation time significantly influenced the flotation process. Desliming was beneficial for the yield, P₂O₅ recovery, and SiO₂ removal; however, there was still a compromise between grade and recovery. A strongly alkaline pH value of 12 stood out from the whole range. P₂O₅, CO₂, and SiO₂ grades of the products and flotation recoveries were improved, except for P₂O₅ recovery, which was negatively affected. A collector dosage between 2000 and 3000 g/t increased the P₂O₅ grade and reduced CO₂ grade and recovery, enhancing the apatite/carbonates separation. A flotation time of 15 min was significant for P₂O₅ grade and CO₂ recovery, nevertheless, at the expense of yield and P₂O₅ recovery. The products having initial concentrates of 28.08% P₂O₅ with a recovery of 88.96% and 29.41% P₂O₅ with a recovery of 62.71% were obtained using 25 g/t of NaAL and 2000 g/t of the collector FAM and sodium oleate, respectively, at pH 12.

许多研究人员已经解决了从低品位磷矿石中直接浮选磷灰石的复杂性。大多数这些研究仅限于微浮选规模。事实上，不能保证在纯矿物上以微浮选规模直接浮选磷灰石的试剂方案会自动在机械浮选槽中对天然矿石复制相同的预期结果，磷矿石研究。总体趋势是磷灰石集中在非浮法产品中。本研究旨在使用实验设计 (DOE) 彻底评估这种从未开发过的低品位沉积磷酸盐的浮选性能。揭示对这种策略扭曲、各种参数和操作条件的新见解，即脱泥、捕收剂和抑制剂的类型、试剂剂量、调节时间、浮选时间和 pH 值，通过使用不对称部分因子设计的多因素筛选以及随后的统计解释来解决。测试的捕收剂是油酸钠和脂肪酸混合物（FAM）。测试的抑制剂是海藻酸钠 (NaAL)、玉米淀粉、羧甲基纤维素 (CMC) 和硅酸钠。多变量分析结果表明，脱泥、pH、捕收剂用量和浮选时间显着影响浮选过程。脱泥有利于产量，P 测试的捕收剂是油酸钠和脂肪酸混合物（FAM）。测试的抑制剂是海藻酸钠 (NaAL)、玉米淀粉、羧甲基纤维素 (CMC) 和硅酸钠。多变量分析结果表明，脱泥、pH、捕收剂用量和浮选时间显着影响浮选过程。脱泥有利于产量，P 测试的捕收剂是油酸钠和脂肪酸混合物（FAM）。测试的抑制剂是海藻酸钠 (NaAL)、玉米淀粉、羧甲基纤维素 (CMC) 和硅酸钠。多变量分析结果表明，脱泥、pH、捕收剂用量和浮选时间显着影响浮选过程。脱泥有利于产量，P₂ O ₅回收、SiO ₂去除；但是，在等级和恢复之间仍然存在折衷。12的强碱性pH值从整个范围中脱颖而出。产品的P ₂ O ₅、CO ₂和SiO ₂品位和浮选回收率都有所提高，但P ₂ O ₅回收率受到负面影响。捕收剂用量在 2000 到 3000 g/t 之间，提高了 P ₂ O ₅品位，降低了 CO ₂品位和回收率，增强了磷灰石/碳酸盐的分离。15 分钟的浮选时间对于 P ₂ O _{5是显着的}然而，品位和 CO _{2回收率是以产量和 P 2} O ₅回收率为代价的。_使用25 g/t NaAL 和 2000 g _/ t捕收_剂FAM和油酸钠，分别在 pH 12 时。