Injectors for Pumped Sidestream Flows
The MultiMix injector uses the energy of turbulent eddies generated by slurry flow over the injector head to create sized oxygen bubbles, which are then dispersed within the slurry.
A unique feature of the MultiMix injectors is the ability to varying the system pressure and with it the pumping energy requirements. The MultiMix injector operates at a significantly lower pressure than "high shear" type oxygen injectors / mixers. For ores with a high oxygen demand, a secondary mixing device may be installed downstream of the injector to increase the system pressure and thereby oxygen mass transfer. Similarly, the secondary mixing device may be installed when oxygen mass transfer efficiency outweighs energy utilisation.
The energy utilisation by a MuliMix injector may be tailored to suit the specific requirements for each gold ore.
The injector is installed within a housing supplied by MultiMix, as depicted in Figure 1. The injector is fabricated from 316 stainless steel and all wetted services are lined with a wear resistance ceramic and custom-made Linatex sleeves. The injector design and fabrication ensures a long service life and minimal maintenance. The injector is designed such that it seals automatically when gas flow stops. The self-sealing mechanism, in combination with a small flushing water flow, prevents slurry clogging the injector head.
The MultiMix injectors offer the following benefits:
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Minimal maintenance - one person can remove an injector head and install a new unit in approximately 15 minutes. A crane is not required.
Several MultiMix injector models are available to suit a variety of slurry flow rates:
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TYPICAL SLURRY FLOW RATE |
Series 100 LF |
100 - 250 m³/h |
|
250 - 550 m³/h |
Series 150 |
550 - 1150 m³/h |
OXYGEN INJECTOR - EXAMPLES OF INSTALLATION
MultiMix recommends installing the injectors such that the incoming feed is directed to the suction side of the injector. This is depicted in Figure 1 below and an alternate option shown in Figure 2. For other installation options, please contact MultiMix.
Figure 1 - Injector Installation with Leach Feed to the Inlet of the Injector.
Figure 2 - Injector installation on a tank recycle stream.
Figure 3 - Optimum installation with Leach Feed to the inlet of the Injector and slurry
returned into the base of the tank.
Figure 4 - A pipeline reactor included with the recycle pump to extend the time the slurry
is pressurised and in contact with oxygen.
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