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ENGLISH SUMMARY Carbon in pulp CIP and carbon in leach CIL circuits have been the primary methods used for treating gold ores for many years Although inherently robust processes there is still often much room for optimisation to improve gold extraction efficiencies and to reduce reagent consumption and operating costs A number of models for leaching and
·One of the main problems in the design of carbon adsorption The model developed is an optimal control model of the adsorption process of a hydrometallurgical process called Carbon In Pulp The Carbon in leach and carbon in pulp are continuous processes that use activated carbon in a cascade of large agitated tanks which have
·A steady state simulator for CIP/CIL circuits has been developed The simulator is based on a model of a single CIL tank This model combines descriptions of the kinetics of leaching the kinetics of adsorption and the residence time behaviour of the pulp solids leach liquor and carbon This work was part of a co operative research project between the Julius
·A Carbon in Pulp CIP mass balancing model is a valuable tool used in the mining industry to optimize the recovery of valuable metals like gold from ore This model employs principles of mass conservation to track the movement and distribution of carbon and gold throughout the CIP process Key components of a CIP mass balancing model include
·The process design of gold leaching and carbon in pulp circuits contaminants These are removed by thermal regeneration of the eluted carbon typically in a rotary kiln at temperatures of 650 750°C Regeneration is carried out in a steam atmosphere to minimize carbon degradation due to oxidation The eluted and regenerated carbon is screened
·Then reactivated carbon is added into tank 8 During a transfer the concentration of carbon in a tank may drop from 15 to 11 g/L The carbon transfer is carried out by pumps with intake submerged m below the surface The mixing in the tank may push some carbon from the bottom of the tank to the surface producing possible variation of
·tion tank the carbon particle size distribution the pulp density of the slurry the presence or absence of ore slimes or precipitates in the slurry and the temperature
·The carbon in pulp CIP and carbon in leach CIL processes became firmly established in the gold mining industry in the 1980s initially in South Africa and Australia from where they spread rapidly to all the gold producing regions of the world mg/L by installing one extra CIP tank To arrive at an economic optimum design a
·In short the problem of carbon degradation makes closed or semi open impellers poor selections for carbon tank cleanout applications On the other hand an impeller design commonly used in the pulp and paper industry has attributes that make it ideal for CIL and CIP applications
·A gold ore processing plant that processes 2000 t/d of a gold ore assaying 7 g/t may have a gold inventory of more than 140 000 g of gold in gravity concentrator bins carbon in pulp tanks and in the electrolysis is equivalent to the mass of gold that fed the circuit during 10 days of change of inventory may therefore strongly impact on the
·In the CIP process activated carbon is used to adsorb the gold directly from the cyanided pulp in a series of large adsorption tanks Pulp flows continually from the first vessel to the last in the series and the carbon is transferred intermittently by
·The adsorption tanks are typically a quarter to a tenth of the size of the leach tanks The CIL and CIP modes of operations occur in a number of tanks placed in series Pulp flows continuously from the first tank to the last while carbon is pumped counter current from the last tank to the first
·Gold Mining Equipment Cyanide Leaching Agitation Tank for Extraction Find Details and Price about Carbon in Leach Carbon in Pulp from Gold Mining Equipment Cyanide Leaching Agitation Tank for Extraction Yantai Huize Mining Engineering Co Ltd
·CIP（Carbon In Pulp） 。。 。
·This chapter focuses on the advances made in the design and operation of carbon in pulp CIP and carbon in leach CIL plants Most of the advances over the last few years have been in the area of carbon management Trends towards cyanide free elution are becoming more prevalent impacting positively on operating costs
·carbon in pulp plants developed up to this time One of the first plants to operate on this flowsheet was the carbon in pulp plant at the Carlton Mill at Cripple Creek in Coloradoll which was operating in 1961 Homestake Gold Mine The biggest and most important development in the recovery of gold by carbon in pulp was the introduction
New activated carbon To tillings disposal Pulp from the leaching circuit P IS S Activated c arbon flow Pulp flow Figure 1 Schematic diagram of a carbon in pulp or carbon in leach plant with three tanks showing the interstate screens IS the screen at the exit of the first tank S and the carbon transfer pumps P
Leached pulp and carbon are transferred in a counter current flow arrangement between a series of tanks usually numbering 4 to 6 In the final tank fresh or barren carbon is put in contact with low grade or tailings solution At this tank the fresh carbon has a high activity and can remove trace amounts of gold to levels below mg/L Au in solution
·Carbon recycled off the screen must traverse the entire tank height before returning to the inter stage screen As depicted in Figure 4 this flow pattern minimizes both carbon and slurry short circuiting while simultaneously eliminating localized high carbon concentrations near the screening device Engineering and Design
·first stage adsorption contactor to the loaded carbon screens by airlifting of a pulp and carbon mixture Any particles larger than 0 84 mm that enter the adsorption circuit with the pulp are retained in the first adsorption tank and follow the loaded carbon to elution and regene ration For this reason most CIF plantsl 4 have installed
The amount of carbon in each 392 m3 carbon in pulp tank is the main determining factor for gold extraction efficiency Each tank requires up to 12 tonnes of carbon and 5 ppm dissolved oxygen to concentrate 93 96 % of soluble gold at 95 % carbon activity rate achieving up to 10 000 ppm gold cyanide in feed and ppm in tails solution
·An assessment is made of the economic consequences of process options available for the design of a carbon in pulp plant This takes place in a series of agitated tanks where carbon is
·Attrition of activated carbon in either the carbon in pulp CIP or carbon in leach CIL method of gold extraction can lead to at the least loss of expensive carbon that has to be made up and at the worst loss of both the carbon and any gold that was attached to it Carbon attrition therefore represents a significant factor in both the efficiency and cost of the extraction
·Since the carbon is modelled as a continuous flow Equation [2] the model predicts the carbon loading just prior to elution or a carbon transfer With one elution per day the carbon residence time for the model is therefore taken as 24 hours An example of the plant carbon loadings in each tank for the period 1 5 December 2015 compared to
·2 Carbon adsorption The solubilized gold is adsorbed onto coarse granules of activated carbon in the tanks at the same time as the slurry flws from the fist CIL tank to the last The carbon is retained in the tanks by using cylindrical mechanically swept interstage screens which are submerged in the pulp
The amount of carbon in each 392 m 3 carbon in pulp tank is the main determining factor for gold extraction efficiency Each tank requires up to 12 tonnes of carbon and 5 ppm dissolved oxygen to
·Cyanidation Carbon in Leach Carbon in Pulp Carbon in Column Cyanidation is a widely used method in which gold is dissolved in a cyanide solution allowing it to be extracted from ore Activated carbon is used to adsorb the gold from the cyanide solution in processes like Carbon in Leach CIL Carbon in Pulp CIP and Carbon in Column CIC
