Abstract SYMPHOS 2011
Abstract SYMPHOS 2011
Abstract SYMPHOS 2011
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42<br />
Johan SIIRAK,<br />
AkzoNobel Surface Chemistry,<br />
Stenungsund/SWEDEN<br />
COLLECTOR DEVELOPMENTS FOR COMPLEX PHOSPHATE ORES<br />
BN-O-04<br />
The use of flotation to process phosphate ores has increased over the years as phosphate ores become more fine<br />
grained and complex. The selectivity problems between the phosphate mineral and other calcium minerals like<br />
calcite and dolomite call for the development of new collectors. The paper describes cases where different types<br />
of collectors have been developed to process complex phosphate ores with different mineralogical compositions.<br />
SURFACE TENSION MEASUREMENT FOR OPTIMIZATION OF FLOTATION CONTROL<br />
A. Kramer1 , S. Gaulocher1 , M. Martins2 , L.S. Leal Filho2 BN-O-05<br />
1 ABB Corporate Research, Baden-Dättwil, SWITZERLAND<br />
2 University of São Paolo, Engineering School-Mineral Processing Research<br />
Group, São Paulo-SP, BRAZIL<br />
In the mineral processing industry froth flotation is widely used for ore separation and concentration. Recently,<br />
we found that for phosphate flotation there is a specific relation between ore separation efficiency and surface<br />
tension of the slurry with an optimum operating point that maximizes separation efficiency (Figure, left) [1]. In<br />
this paper we suggest online in-situ measurement of surface tension in the flotation cell and application of this<br />
information for process control (Figure, right). We propose appropriate instrumentation which is suitable for the<br />
typically harsh flotation environment. Besides other measurement parameters, such as pH value, ore composition<br />
and feed rate, surface tension represents a valuable complementary process parameter which is beneficial for<br />
improvement of the flotation control. We suggest using this additional information as input for a model predictive<br />
control system (MPC), which was developed by ABB and successfully applied in a zinc flotation plant [2]. Accurate<br />
knowledge of the relation between surface tension of the slurry and the ore separation efficiency in combination<br />
with a refinement of the physical model provides the basis for an improved MPC. A system on this basis will lead to<br />
a more profitable process regarding ore recovery or ore grade.
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