The possibility of optimizing the concentrations of dissolved ions in the recirculated process water affecting molybdenum flotation through mathematical modeling
DOI:
https://doi.org/10.5564/bicct.v13i13.5219Keywords:
molybdenite, floatability, depression effect, dissolved ions, design of experimentsAbstract
Molybdenum recovery from copper-molybdenum flotation process that uses recirculating water is challenging, and rarely reaches 50%.The Erdenet mining company reuses the recirculating water generated from the settling tank of waste sludge pond, with the amount of approximately 2.7 m3 of water per ton of ore flotation. The water in the tailing pond is replenished by snow and ice melt, and precipitation, especially during the spring and summer seasons. In addition, due to aerobic conditions, organic residues undergo oxidation, and through repeated recirculation, the concentration of dissolved ions increases. As well as, the accumulation of copper, molybdenum, calcium, magnesium and iron affects the surface properties of the ore. This work aimed to study the effect of dissolved ions in recirculating water on the molybdenite flotation and to identify the optimized concentrations of the ions through mathematical modeling. The increase in the concentration of each ion appears to have a depressing effect on the floatability of molybdenite in the order of Cu2+> Ca2+> Fe3+> Mo4+. The optimization was conducted by using factorial design using Design-Expert software (version 13). The optimized concentrations of Ca2+, Fe3+, Cu2+ and Mo4+ were estimated to be 250.0, 2.0, 0.12 and 1.2 mg/L, respectively. These conditions resulted in the highest molybdenum metal recovery of 57.81% and a yield of 2.18%. This study proposes optimal dissolved ion conditions in recirculating water that can significantly improve molybdenum recovery. Молибдены флотацид нөлөөлөх эргэлтийн усанд ууссан ионуудын концентрацийг математик загварчлалаар оновчлох боломж Хураангуй: Эргэлтийн усан хангамж бүхий зэс-молибдены хүдэр баяжуулах процесс молибдены ихээхэн алдагдалтай явагддаг бөгөөд металл авалт 50%-иас бараг хэтэрдэггүй. “Эрдэнэт үйлдвэр’’ ТӨҮГ-ын Баяжуулах үйлдвэрээс гарч буй маш их ус агуулсан хаягдал булингыг хаягдлын санд тунгаан, нэмэлт цэвэрлэгээгүйгээр эргүүлэн ашигладаг. Тунгаан цэвэрлэгдсэн энэ усыг эргэлтийн ус гэх ба 1 тонн хүдэр боловсруулахад 2.7 тонн ус ашигладаг. Хаягдлын сангийн ус нь ялангуяа хавар, зуны улиралд цас, мөс, хур тунадасны усаар сэлбэгдэх мөн аэробик орчны нөлөөгөөр органик үлдэгдлүүд исэлдэж, олон дахин эргэлтэд орсноор усны ионуудын агуулга нэмэгдэж байна. Түүнчлэн зэс, кальци, магни, төмөр, молибден, сульфат ионуудын ихээхэн хуримтлал үүсэх нь хүдрийн гадаргуугийн шинж чанарт нөлөөлдөг. Энэхүү судалгаагаар эргэлтийн усанд ууссан Ca2+, Fe3+, Cu2+, Mo4+ ионуудын агуулгын ихсэлт молибденитийн баяжигдах чанарт нөлөөлөх нөлөөллийг судлах, ионуудын концентрацийн харьцааг математик загварчлалаар оновчлох судалгааг хийсэн. Ион бүрийн концентрацийн ихсэлт молибденитийн баяжигдах чанарт дарагч нөлөө үзүүлэх байдлаар нь Cu2+>Ca2+>Fe3+>Mo4+ гэж эрэмбэлж болохоор байна. Ууссан ионуудын концентрацийн харьцааг математик загварчлалаар оновчлох судалгаанд “Design Expert 13’’ программын математик төлөвлөлтийн Factorial Design аргыг ашигласан. Эргэлтийн усанд ууссан ионууд (Ca2+, Fe3+, Cu2+, Mo4+)-ын концентрацийн оновчтой харьцааг Cu2+-0.12 мг/л, Ca2+-250.0 мг/л, Fe3+-2.0 мг/л, Mo4+-1.2 мг/л мужид молибдены металл авалт хамгийн их буюу 57.81%, гарц 2.18% байх боломжтой гэж тодорхойлсон. Түлхүүр үг: молибденит, баяжигдах чанар, дарагч ионууд, design of experimentsDownloads
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