Refinement of the flotation reagent plan based on coal feed ash content

The effect of frother dosage (۶۷, ۲۰۰, and ۴۰۰ g/t), collector dosage (۲۰۰, ۶۰۰, and ۱۰۰۰ g/t), and frother type (Mixed aliphatic alcohol (MAA), Methyl Isobutyl Carbinol (MIBC), and pine oil) on the flotation performance of three coal samples with various ash contents of ۴۵.۱% (high ash content coal, HAC), ۳۶.۸% (moderate ash content coal, MAC), and ۳۰.۷% (low ash content coal, LAC) was studied. The optimal flotation conditions for each coal sample were quite different. For HAC, a clean coal with an ash content of ۱۲.۸% and a yield of ۳۸% was produced under optimal conditions using MIBC as the frother dosage of ۳۶۱ g/t, and a collector dosage of ۲۰۰ g/t. In the case of MAC, a clean coal with an ash content of ۱۰.۲% and a yield of ۴۶% was produced under optimal flotation conditions using MAA as the frother dosage of ۱۴۸ g/t, and a collector dosage of ۲۰۰ g/t. For LAC, a clean coal with an ash content of ۹.۸۷% and a yield of ۵۷.۴% was produced under optimal flotation conditions using pine oil as the frother dosage of ۱۷۴ g/t, and a collector dosage of ۱۰۰۰ g/t. For LAC feed coal, in comparison with HAC feed coal, a lower frother at dosage, higher collector dosage, and pine oil frother instead of MIBC must be used. The optimal conditions for HAC flotation were validated in a coal washing plant. After conducting the necessary modifications to the flotation reagent scheme, yield, combustive material recovery (CMR) and separation efficiency (SE) of the plant increased by ۵.۹%, ۱۱%, and ۷.۵%, respectively which results in more clean coal production of about ۱۴۱۶۰ t/y.

کلیدواژه ها:

Flotation ، Feed coal ash content ، Flotation reagent scheme ، Process optimization ، Laboratory and plant validations