This article compiles the results of a review of world copper solvent extraction (SX) plant practices and examines changes in operating practices in the last seven years as …Web

In this work we present a general dynamic model for SX mixer–settlers, and applied it to two different units, one located in an extraction stage and the other in a stripping stage of a copper plant. The model includes a non-trivial settler hydrodynamics represented by a set of nonlinear differential equations for both mixer and settler units.Web

A two level control strategy that stabilizes and optimizes the production of an industrial copper solvent extraction process is presented. The stabilizing layer …Web

Second Step: Stripping. The second major part of the S-X operation is the recovery of the desired material from the organic solvent in a purified and concentrated form in such a way that the organic solvent can be recycled to the extraction operation. This second step is usually called "stripping.".Web

This article compiles the results of a review of world copper solvent extraction (SX) plant practices and examines changes in operating practices in the last seven years as compared to previous world copper SX surveys in 1996 and 1999. Trends covered are fiber-reinforced plastic construction mixer box and settler designs, reverse flow settlers, and …Web

Improvements in plant control would make it possible to keep process variables near their optimal values, thus increasing the amount of copper produced, …Web

Copper was extracted on asphalt-lined leach pads and recovered in the first solvent extraction and electrowinning (SX/EW) plant in Latin America. Production capacity was 33,000 metric tonnes per year (mtpy) of high purity copper cathodes. At the time, the use of solvent extraction followed by electrowinning for low grade, impure …Web

The basic idea of the VSF™ technology is to maintain smooth agitation throughout the solvent extraction plant to avoid oxidation of organic and development of overly small droplet size in dispersion (Outotec Oyj 2007). The solvent extraction reagents can selectively extract copper over other metals from feed solution (Kordosky et al. 2006).Web

The dynamic behaviour of an industrial copper solvent extraction mixer–settler cascade is modelled to develop an advanced process control system. First, the process is introduced and the ...Web

Abstract. In this paper the current status of the modeling, simulation and control of the copper-leaching, solvent-extraction and electrowinning process (LX/SX/EW) is investigated. No implementations of advanced process control in the copper LX/SX/EW process have so far been reported. However, model-based control has been …Web

This article compiles the results of a review of world copper solvent extraction (SX) plant practices and examines changes in operating practices in the last seven years as compared to previous world copper SX surveys in 1996 and 1999. Trends covered are fiber-reinforced plastic construction mixer box and settler designs, reverse flow settlers, and advanced …Web

Copper Production. W.G. Davenport, in Encyclopedia of Materials: Science and Technology, 2001 2.3 Electrowinning. Electrowinning is the plating of metallic copper from the CuSO 4 –H 2 SO 4 –H 2 O electrolyte produced by solvent extraction. It consists of passing direct current between inert but conductive anodes (usually Pb–Sn–Ca alloy) …Web

Copper solvent extraction circuit (Cu SX) Copper is selectively transferred from the relative low grade Cu PLS into a high-purity electrolyte stream using a copper selective extractant. The extractant employed is an oxime-based copper-selective chelating reagent that is dissolved in a high flashpoint hydrocarbon diluent to make up the organic ...Web

The dynamic behaviour of an industrial copper solvent extraction mixer–settler cascade is modelled to develop an advanced process control system. First, the process is …Web

Copper and cobalt production from oxide ore types in the African Copperbelt by agitation leaching followed by solvent extraction (SX) and electrowinning (EW) has been practiced for many years. The Tailings Leach Plant at Nchanga in Zambia was commissioned in 1974 and is still in operation today1. In recent years, more of these types of plants ...Web

Abstract Manganese has both direct and consequential effects on the operation of copper solvent extraction (SX) and electrowinning circuits, as well as some other unit processes. These, in turn, generate further symptoms which can form positive feedback loops and can very quickly lead to catastrophic reductions in plant …Web

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With the proposed control strategy and the latest proposed control strategy in the literature, the production of the copper solvent extraction process was increased by almost 6% and 3% ...Web

IFAC Workshop Automation in MMM Industry 20-22 September 2006 Cracow, Poland SUPERVISORY CONTROL PROJECT OF A COPPER SOLVENT EXTRACTION PILOT PLANT Luis G. Bergh, Erich M. Lucic and Frank Zuleta Chemical Engineering Department, Santa Maria University Valparaiso, Chile, /lIis. hen;h({u,lIsm.cl Abstract: The experience …Web

Basic Process Reaction and Design Parameters. The extraction of copper from aqueous solution by the application of organic solvents such as LIX 64N or the Ashland Chemical products Kelex 100 and 120 proceeds chemically, according to the following equation: (2RH) org. + CuSO4 aq. = (R2Cu) org. + H2SO4 aq.Web

For instance, during the separation of cobalt and nickel by solvent extraction with acidic extractants, large amounts of bases and acids are consumed, respectively, for pH control and stripping . As a result, significant volumes of salt solutions are produced ( e.g., Na 2 SO 4 solutions), which are typically discharged to surface waters.Web

suited for both larger and smaller plants, as it enables low entrainment values and very stable performance even with fluctuating flow rates. Optimized solvent extraction In the solvent extraction phase of the process, incoming pregnant leach solution (PLS) is concentrated and purified, and a pure electrolyte is then used in electrowinning to ...Web

Solvent extraction (SX) or liquid–liquid extraction is one of the most widely performed hydrometallurgical techniques for the separation and purification of precious metals, base metals, rare-earth elements (REEs), actinides, alkali and alkaline-earth metals, and so on. This unit operation is based on differences in distributions of metal ions between two …Web

The dynamic behaviour of an industrial copper solvent extraction mixer–settler cascade is modelled to develop an advanced process control system. First, the process is introduced and the dynamical models are formulated. The testing environment is described and the successful results presented. Only industrially …Web

PDF | A two level control strategy that stabilizes and optimizes the production of an industrial copper solvent extraction process is presented. The... | Find, read and cite all the research...Web

With this two level control strategy the production of the copper solvent extraction process is increased by 3–5% and the process variation is decreased by 70–90% compared to the manual ...Web

Copper Operation solvent extraction plant, Wu, M., Nakano, M., She, J.-H., A model-based Proceedings of the ALTA 2002 Copper-7 expert control system for the leaching process in Conference, Castlemaine, Victoria 2002, 23 p. ... Nakano, M., Gui, W., Expert control to a solvent extraction plant, Advances control and fault diagnosis of the …Web

Because of the design of mixers currently used in copper solvent extraction plants, metal transfer in a stage is usually about 85 to 95% of theoretical. For this reason, the values predicted by equilibrium McCabe-Thiele diagrams for the aqueous and organic phases exiting a given stage are seldom realized in an operating circuit.Web