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:: Level Measurement Probes for Flotation Applications
This article aims to introduce the LTM-2 level measurement probes from Instek Control as an alternative to traditional measurement systems employed throughout the flotation industry. The LTM-2 probe was designed and developed in Germany, specifically to meet the challenges of flotation applications. The probe is a 2-wire loop powered instrument constructed from high grade stainless steel, with no moving parts it utilises a form of conductivity called the Electro Potentiometric Effect to determine the pulp/froth interface.
Put to the test in a field trial - In 2016, Booysendal Platinum’s concentrator plant agreed to trial a unit supplied by Redland Engineering, distributors for the LTM-2 in Mpumalanga and Limpopo. The probe was trialled on a column float cell, a cleaner float cell and on a concentrate sump, all applications known to pose difficulties in respect of accurate level measurement when utilising conventional methods.
Prior to the trials, level measurements were achieved by means of a bubbler for the columns, a ball-and-striker plate for the cleaner float cells, and an ultrasonic level sensor on the concentrate sumps. These methods all posed challenges, which could result in production losses through:
Bubblers on column flotation:
The LTM-2 probe showed the following advantages when installed in place of the ultrasonic devices:
Subsequently, Booysendal Platinum has replaced all bubbler tubes with LTM-2 probes and they will consider phasing in LTM-2 probes in the concentrate sumps on the cleaner circuit with a view to implementing them in the flotation cells in the future.
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