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Kemix

AAC Pumpcell Plant

This self-contained carousel carbon adsorption plant enhances carbon management. The AAC Pumpcell Plant has a residence time of approximately fifteen minutes per stage, making it considerably smaller than conventional CIP circuits. The AAC Pumpcell Plant operates at carbon concentrations of 30 to 80 g of carbon per litre of pulp.


A carousel circuit differs from a cascade circuit by rotating the feed and discharge points of each tank to simulate the counter current movement of carbon against the pulp flow. Carbon management is simplified as each cell contains a discrete batch of carbon. In the cascade circuit the carbon is pumped against the pulp flow on a continuous basis.



The Pumpcell tank is comprised of an internal launder system, discharge and feed pipes, launder gate and plug valves. The internal launder is arranged to facilitate the individual functions of feeding pulp to the pumpcell, discharging pulp from the pumpcell and bypassing the pumpcell in the event of taking the particular pumpcell off line. This launder also connects the adjacent pumpcells together. The nature of this launder arrangement enables the carousel mode of operation to be employed.


Pulp should be screened prior to it entering the CIP circuit to remove grit or fibrous material thus preventing the ingress of this material into the pumpcell circuit. The screened pulp exiting the leach circuit either gravitates or is pumped to the pumpcell feed launder arrestor box.


The head pumpcell receives fresh pulp from the feed launder located above the pumpcell top platform. The feed launder valve arrangement directs the flow of pulp into the desired pumpcell. The pulp enters the pumpcell via a feed pipe and is directed to an area below the down pumping hydrofoil, thus reducing the possibility of short circuiting with the pumpcell.


The pulp flows through the pumpcell mechanism to the subsequent tank. Once the pulp has passed through all the stages in the pumpcell train the pulp exits the last pumpcell in the carousel sequence and is directed via a residue valve and manifold to the residue screen.


When the gold on carbon loading in the head pumpcell has reached the predetermined value, the head pumpcell is isolated and the feed material will be directed to the second pumpcell in the carousel sequence.


When the content of the original head pumpcell has been drained, that pumpcell is brought back on line as the new tail pumpcell.


During the draining of the head pumpcell the entire pumpcell plant operates with one pumpcell less in the carousel sequence. 


Interstage Screens


These are used in CIL and CIP applications to screen pulp and activated carbon from each other. Typically, CIL or CIP applications operate in a cascade arrangement, where pulp is either pumped or gravitates down the adsorption circuit while carbon is pumped up the circuit. The pulp and carbon need to be separated from each other prior to the pulp proceeding down the circuit.

The MPS interstage screen is utilised in circuits with adsorption tanks staggered in a cascade arrangement, allowing the pulp to gravitate down the circuit.

The MPS(P) interstage screen is equipped with an impeller which generates a pulp height differential allowing the pulp to flow into the next adsorption tank. This allows all adsorption tanks to be located on the same elevation, achieving ergonomic as well as installation capital cost benefits over a cascade circuit.



Industrial Mixers


Kemix offers two ranges of mixers, the KX range of heavy-duty industrial mixers and the lighter Stallion A and C Series.


The KX range is used extensively in the mining industry to handle heavy slurries. The Stallion A and C Series mixers are used in the dairy, food, brewery, pharmaceutical and processing industries.


A wide variety of design configurations can be applied to individual applications to maximise agitation efficiency and duty requirements.



Carbon Regeneration Kilns


Kemix's carbon regeneration kiln is an indirectly fired rotary furnace featuring the Kemix patented dewatering screw feeder arrangement. Each Kemix kiln is custom designed to fulfill customer needs in terms of the type of firing, throughput rate and required residence time of carbon at a specified temperature.

The Kemix kiln can be electric, gas, heavy or light fuel oil fired.

Each kiln is supplied with a control panel incorporating an automatic start-up and shut-down sequence. An emergency direct current standby rotation drive is automatically activated in the event of power failure or loss of drive.


Packed Bed Electrowinning Cell


Electrowinning is performed by applying a current across an anode and cathode, submerged in a gold rich eluate. This results in reduction occurring at the cathode and a subsequent deposition of gold onto the stainless steel cathode mesh.


The packed bed electrowinning cell is a stainless steel rectangular bath having cathodes and anodes alternatively positioned along its length. Cathodes consist of insulated baskets containing stainless steel wire mesh, while anodes are fabricated from stainless steel.


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