ارتباط با ما
با ما تماس بگیرید
0086-21-58386256
0086-21-58386256
Heap hydrodynamics plays an important role in the transport of both leaching reagents and dissolved metal species and thus uniform liquid distribution through the ore mass is required. However, liquid channelling within the heaps has been identified as one of the main contributing factors for non-uniform liquid distribution.
The aim of the current study is to use the pore flow approach in the hydrodynamic modeling of heap leaching. Also, by using this approach and presenting …
Hydrodynamics of the heap systems were evaluated during (1) the scale-up from a 350 kg column to a 55 tonne crib to a 6300 tonne heap, and (2) the change in ore …
Abstract. Three mathematical models (mixed side-pore diffusion (MSPD) and profile side-pore diffusion (PSPD) with uniform or distributed pore lengths) are derived in …
Various factors, such as large variations in ore hydraulic properties, saturated-unsaturated flow, preferential flow pathways, perched water tables, …
While the noteworthy merits of heap leaching are low capital and operational costs, a significant shortcoming is the low recovery efficiencies. Heap hydrodynamics is …
ABSTRACT Heap leaching is a well-established extractive metallurgical technology enabling the economical processing of various kinds of low-grade ores, which could not otherwise be exploited. However, despite much progress since it was first applied in recent times, the process remains limited by low recoveries and long extraction times. …
Heap leaching is one of the most important hydrometallurgical techniques for the extraction of valuable metals from low grade ores due to the relatively low capital costs and limited …
The basic formulation of a comprehensive heap leaching copper model based on CFD technology, together with its parameterization and validation against laboratory column test data is developed by ...
Several fluid flow-related parameters were quantified to understand the effects of segregated pore networks on fluid flow in heap leaching. The isolated and connected pores co-exist in porous ore heaps, and the latter determines heap hydrodynamics. The number of connected pores in the AM is higher than in the COM.
His thesis was entitled "Hydrodynamics of unsaturated particle beds pertaining to heap leaching". In it, he has explored the fluid flow behaviour in heap leaching systems experimentally by measuring liquid holdup and tracer transport. Dr Saman has extensive mining, minerals processing, chemical process engineering, and industrial rock ...
Usual approaches for heap leaching models solve the different phenomena in an uncoupled or just ... formulated to solve hydrodynamics and solute transport (Decker & Tyler, 1999), and soil ...
Heap hydrodynamics plays an important role in the transport of both leaching reagents and dissolved metal species and thus uniform liquid distribution through the ore mass is required.
Based on the momentum and mass conservation equations, a comprehensive model of heap bioleaching process is developed to investigate the interaction between chemical reactions, solution flow, gas flow, and solute transport within the leaching system. The governing equations are solved numerically using the COMSOL Multiphysics …
Heap leaching is one of the most important hydrometallurgical techniques for the extraction of valuable metals from low grade ores due to the relatively low capital costs and limited comminution ...
My main research interests are as follows: Heap hydrodynamics/packed bed flow analysis; Modification of heap beds to improve liquid percolation; Minimize liquid channelling in heap leaching ...
Semantic Scholar extracted view of "Insight into solute and microbial transport in heap (bio)leaching systems using residence time distribution" by Elaine Govender-Opitz et al. Skip to search form Skip ... Improved inter-particle flow models for predicting heap leaching hydrodynamics. I. Ilankoon S. Neethling Zibin Huang Zhenmin Cheng ...
This paper outlines a comprehensive, cost-effective testing program for the acid-ferric sulfate heap leaching of oxide, supergene and primary copper ores. It is based on extensive experience in copper heap leaching and uses the many technological advances in the field developed over the past several decades. The approach described …
The chemical binder is one of the critical factors affecting ore agglomeration behavior and leaching efficiency. In this study, we investigated the effect of the type of binder and mass fraction of the H 2 SO 4 solution used on the curing, soaking, and leaching behavior of agglomerations. The results revealed that Portland cement (3CaO·SiO 2, …
Leaching and micro-focus X-Ray computed tomography (µXCT) characterization studies were performed on a synthetic silver ore prepared from cement mixtures with embedded silver grains. This was done with the aim to understand the leaching behaviour of coarse ore particles in laboratory-scale heap leaching experiments.
Heap leaching is commonly applied to recover copper, gold and uranium from low-grade ores. It comprises the stacking of coarsely crushed ore on an impermeable pad and irrigating with a suitable leach solution. ... The isolated and connected pores co-exist in porous ore heaps, and the latter determines heap hydrodynamics. The number of …
With regards to producing predictive hydrodynamics tools for heap leaching, many researchers have favoured the uniform material properties (e.g. homogeneous and isotropic) assumption along with a continuum approach (i.e. local variations are discounted but the entire domain properties are considered). Dixon (2003) solved the Richards …
Investigative study into the hydrodynamics of heap leaching processes. S. Bouffard, D. G. Dixon. Published 1 October 2001. Environmental Science. Metallurgical …
Heap hydrodynamics plays an important role in the transport of both leaching reagents and dissolved metal species and thus uniform liquid distribution through the ore mass is required. However, liquid channelling within the heaps has been identified as one of the main contributing factors for non-uniform liquid distribution.
The leaching mining method is an ore mining method in which useful components in the deposits, ores, and waste rocks are dissolved, leached, and recovered by using chemical solvents or microorganisms through the effects of chemical leaching, mass transfer, heat, and hydrodynamics, according to the physical and chemical …
Heap hydrodynamics plays an important role in the transport of both leaching reagents and dissolved metal species and thus uniform liquid distribution through the ore mass is required.
Investigative study into the hydrodynamics of heap leaching processes. Three mathematical models (mixed side-pore diffusion (MSPD) and profile side-pore diffusion (PSPD) with uniform or distributed pore lengths) are derived in dimensionless form to simulate the transport of solutes through the flowing channels and the stagnant pores …
The liquid phase hydrodynamics in column and heap leaching is a key design aspect that has attracted some attention, but was not yet completely elucidated. On the other hand, conventional trickle ...
The tracer methods included tracer injection in the feed solution and monitoring soluble species during rinsing. Hydrodynamics of the heap systems were evaluated during (1) the scale-up from a 350 ...
While the noteworthy merits of heap leaching are low capital and operational costs, a significant shortcoming is the low recovery efficiencies. Heap hydrodynamics is a vital contributor to the overall recovery as it facilitates the transport of both the chemical reagents and the dissolved metal species.
The understanding of the hydrodynamics in heap leaching is greatly assisted by the fundamental knowledge gained in the field of unsaturated soil mechanics, where it states that the flux of liquid phase through porous soil matrix is proportional to the hydraulic head gradient, with the proportionality being the unsaturated hydraulic …
Heap leaching is one of the most important hydrometallurgical techniques for the extraction of valuable metals from low grade ores due to the relatively low capital …
Study on the hydrodynamics of heap leaching process [J]. Mathematical Theory and Applications, 2006, 26(3): 123–125. MathSciNet Google Scholar ACHARYA R C, VAN DER ZEE S E A T M, LEIJNSE A. Approaches for modeling longitudinal dispersion in pore-networks [J]. Advances in Water Resources, 2007, 30(2): 261–272.
Heap leaching as a hydrometallurgical process is one of the cheapest methods and particularly useful in the case of ores with a low metal content. These characteristics are especially attractive ...
The liquid phase hydrodynamics in column and heap leaching is a key design aspect that has attracted some attention, but was not yet completely elucidated. On the other hand, conventional trickle ...
The existence of hysteresis in the liquid holdup in heap leaching systems presents both a challenge and an opportunity in terms of heap operation, but modelling of heap hydrodynamics has not often considered this aspect.
The aim of the current study is to use the pore flow approach in the hydrodynamic modeling of heap leaching.Also, by using this approach and presenting a novel method, the tortuosity of the porous media was predicted. For this purpose, a laboratory scale column with dimensions 20 cm × 20 cm × 45 cm containing copper oxide …
