بازیابی بهینه آب با تأکید بر نرخ مصرف فلوکولانت در تغلیظ‌کننده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی گروه مهندسی معدن، دانشگاه سیستان و بلوچستان

2 سرپرست واحد فرایند کارخانه هماتیت مجتمع گل‌گهر سیرجان

چکیده

آب نقش مهمی در فراوری کانی‌ها دارد و تقریباً برای فراوری یک تن ماده معدنی 2 تا 3 تن آب مصرف می‌شود. بخش عمده عملیات بازیابی آب در تیکنرها انجام می‌شود. در تحقیق حاضر، به‌منظور مهار باطله تر خروجی از کارخانه هماتیت گل گهر، در حالات مختلف خوراک دهی، میزان مناسب مصرف فلوکولانت با اهمیت دادن به شفافیت آب سرریز و صرفه‌جویی در مصرف آب کارخانه تعیین شد. آزمایش‌های ته‌نشینی با تغییر نوع فلوکولانت مورد استفاده  (A25, A26 Yazd, A26 Esfahan, A27, A28)، میزان مصرف فلوکولانت (20، 25، 30، 35 و 40 گرم بر تن) و درصد جامد خوراک ورودی تیکنر (5، 7، 9، 10 و 11 درصد) انجام شد. با توجه به دخالت سه عامل ذکر شده در پنج سطح مختلف، طرحL25  تاگوچی برای انجام آزمایش‌ها انتخاب شد.نتایج به‌دست آمده از آنالیز واریانس با در نظر گرفتن قابلیت اعتماد 95 درصد نشان داد که نوع فلوکولانت و درصد جامد خوراک ورودی تأثیر قابل ملاحظه‌ای بر شفافیت آب ندارد، اما مقدار مصرف فلوکولانت به‌طور چشمگیری شفافیت آب را تغییر می‌دهد) 006/0=p-value). همچنین مشخص شد که استفاده از فلوکولانتA26  با میزان 40 گرم بر تن، شفافیت بهینه آب را در پی خواهد داشت. با اجرای نتایج این تحقیق در کارخانه مورد مطالعه، میانگین مصرف آب به ازای هر تن ماده ورودی از 86/0 متر مکعب به 49/0 مترمکعب کاهش و در نتیجه درصد رسوبات کف واحد تغلیظ کننده از 7 درصد به 45 درصد افزایش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Optimal Water Recovery with Emphasis on Flocculant Consumption Rate in the Thickener

نویسندگان [English]

  • Marzieh Hosseininasab 1
  • Roohollah Rezazadeh 2
1 Academic staff member, Department of Mining Engineering, University of Sistan & Baluchestan
2 Director of Process Unit, Hematite Plant, Gol-e-Gohar Complex, Sirjan, Iran
چکیده [English]

Water plays a vital role in mineral processing as evidenced by the approximately 2 to 3 tons of water used for the treatment of one ton of ore. A major portion of this water may be recovered in thickeners. This study aimed to control the wet tailings output of the Hematite Gol-e-Gohar plant by changing  flocculant dosage and type and solid percentage in the feed in order to enhance effluent clarity and reduce water consumption. Materials and A series of settling experiments were performed using different combinations of the flocculants (A25, A26 Yazd, A26 Esfahan, A27, and A28), flocculant doses (20, 25, 30, 35, and 40 gr/ton), and solid loads in the feed (5, 7, 9, 10, and 11%) to the thickener. The L25 Taguchi design method was chosen to handle the five different levels of the three factors. Adopting a 95% confidence interval, the results of analysis of variance (ANOVA) revealed that flocculant consumption rate had a high effect on settling velocity (p = 0.006) while flocculant type and solid percentage in the feed had no significant effects. Moreover, it was found that A26 (Akhtar-chemistry Company, Yazd) used at a rate of 40 g/ton improved the settling performance to yield an optimal water clarity. Using the findings of this study in process planning at the plant led to a considerable reduction (from the original 0.86 to 0.49 m3) in average water consumption per ton of input material so that the solid content of the thickener underflow rose from 7 to 45%.

کلیدواژه‌ها [English]

  • Water Recovery
  • Gol-E-Gohar
  • Tailing
  • Flocculant
  • Taguchi Experiment Design
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