Improving Nickel Recovery in Froth Flotation by Purifying Concentrators Process Water Using Dissolved Air Flotation

被引:1
|
作者
Aaltonen, Annukka [1 ,2 ]
Le, Thi Minh Khanh [1 ]
Saari, Eija [1 ]
Dahl, Olli [2 ]
Musuku, Benjamin [2 ,3 ]
Lang, Aleksandra [4 ]
Hiidenheimo, Sakari [1 ]
Dixon, Richard [5 ]
机构
[1] Metso Outotec Finland Oy, Rauhalanpuisto 9, Espoo 02230, Finland
[2] Aalto Univ, Sch Chem Engn, Dept Bioprod & Biosyst, Vuorimiehentie 1, Espoo 02150, Finland
[3] Boliden Kevitsa Mine, Kevitsantie 730, Sodankyla 99670, Finland
[4] Metso Outotec Res Ctr, Kuparitie 10, Pori 28330, Finland
[5] Metso Outotec Espana SA, Ave Arroyomolinos 11, Madrid 28925, Spain
关键词
water quality; process water treatment; dissolved air flotation (DAF); froth flotation; pentlandite; GANGUE MINERALS; PENTLANDITE; QUALITY; DAF; SERPENTINE; MECHANISMS; SEPARATION;
D O I
10.3390/min13030319
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The pressure for saving water by closing the water loops in mineral processing is increasing continuously. The drivers for higher recirculating rates include water scarcity in dry areas, environmental legislation that is becoming stricter in most countries, limitations set for wet tailings management and the increased demands for social licenses to operate. At the same time, to make mineral processing sustainable, the recovery of valuable minerals should be maximized. This leads for a need to close the process water circulation. To see the effect of closed water circulation on metallurgical performance, flotation tests were carried out with nickel concentrate thickener overflow water before and after the process of water purification by dissolved air flotation (DAF). Both total nickel recovery and concentrate grade in laboratory scale flotation tests to the Ni rougher-scavenger concentrate increased after DAF treatment. Chemical and mineralogical characterizations revealed that after DAF treatment, the process water contained fewer metal hydroxides and less fine-grained silicate mineral particles, which is most likely the reason for the improvement in the nickel flotation performance. Based on the feasibility study, improved nickel recovery by DAF treatment of process water can bring economic benefits at a concentrator plant.
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页数:14
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