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Stawell gold mine in co-operation with Outotec Services completed a flotation circuit upgrade on time and on budget last year that, instead of the projected 3.5 improvement, resulted in an increase of 4.5 since the project was completed. Payback was also impressive, occurring within less than four months.
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Flotation has been at the heart of the mineral processing industry for over 100 years, addressing the sulphide problem of the early 1900s, and continues to provide one of the most important tools in mineral separation today. The realisation of the effect of a minerals hydrophobicity on flotation all those years ago has allowed us to treat oxides, sulphides and carbonates, coals and industrial minerals economically, and will continue to do so in the future.
There have been a number of important changes in the industry over the years as flotation technology and equipment have advanced. Xstrata Technology considers the most noticeable has been the increase in sizes of the flotation machines, from the multiple small square cells that were initially used, to the 300 m round cells used today that are the norm in large scale plants.
Other changes have been more subtle, but equally as important. One of these has been the design of the flotation circuit to make the most of the liberation and surface chemistry effects of the minerals. In a lot of these situations it is not a matter of bigger is better, that will make the process work, but being smarter in the application of flotation technology.
Jameson Cells in a scalping operation target fast floating liberated minerals, and produce a final grade concentrate from them. The wash water added to the Jameson Cell assists in obtaining the required concentrate grade due to washing out the entrained gangue. Scalping can be done at the head of the cleaner also known as pre cleaning, or at the head of the rougher also known as pre roughing, and minimises the downstream flotation capacity using conventional cells needed to recover the slower floating minerals.
Jameson Cell in a cleaner scalping duty at Phu Kham, Laos, producing final grade copper concentrate prior to conventional cleaning circuit flowsheet presented in May at Austmine 2011, Brisbane.
Jameson Cells can be used in cleaning circuits to produce consistent final grade concentrates. The ability of the cell to keep a constant pulp level, even with up stream disturbances or loss of feed, enables a constant grade to be obtained.
Xstrata Technology concludes Importantly in a lot of these circuits, it is not the selection of one type of technology that produces therequired grade and recovery, but the selection of several technologies to get the best results. The interaction of slow floating and fast floating minerals, entrainment, hydrophobic gangue and a myriad of other variables make it rare for just one type of technology to prevail, but the combination of different flotation machines can achieve the required outcome more efficiently, as well as make the circuit robust enough to handle variations in feed quality.
Clariant Mining Solutions service engineers develop custom formulated reagents for each ore to be processed, while collectors and frothers are carefully selected for mutual compatibility. Clariant is investing considerably in mining chemicals and in support services for its customers all over the world.
The Jameson Cell has benefitted from over 20 years of continuous development. Early this year, the 300th cell was sold into Capcoals Lake Lindsay coal operation in the Bowen Basin of Australia. Around this time there were a number of coal projects taking in new Jameson Cells, including expansion projects for Wesfarmers Curragh and Gloucester Coals Stratford operations both in Australia, Riversdales Benga project in Mozambique and Energy Resources Ukhaa Khudag coking coal project in Mongolia.
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Nov 01, 2011nbsp018332Xstrata Technology considers the most noticeable has been the increase in sizes of the flotation machines, from the multiple small square cells that were initially used, to the 300 m179 round
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The structure of forced-air circular flotationnbspcell is shown in the following figure.nbspThosenbspcells can be adopted as rougher, scavenger and cleaner. The capacity ofnbspa singlenbspflotationnbspcellnbspcan be up to 680m3.
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The flotation process is the main oredressing method for scheelite ore forui flotation machine can be used as scheelite ore beneficiation equipment to extract the lowgrade disseminated scheelite with good recovery and beneficiation effect but for the coarse disseminated uneven distributed scheelite ore dressing flotation method is not a.