The Experts below are selected from a list of 1389 Experts worldwide ranked by ideXlab platform
Tiexiong Gong - One of the best experts on this subject based on the ideXlab platform.
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spatial distribution of Caliche nodules in surface soil and their influencing factors in the liudaogou catchment of the northern loess plateau china
Geoderma, 2018Co-Authors: Tiexiong Gong, Yuanjun Zhu, Mingan ShaoAbstract:Abstract Quantifying the distribution of Caliche nodules in a catchment is a basis toward understanding soil erosion and soil degradation as well as soil-water processes in the soil containing Caliche nodules. In this study, field surveys and soil sampling were coupled with spatial and statistical analyses along with image processing to investigate the spatial distribution of Caliche nodules and their influencing factors in the Liudaogou catchment, the northern Loess Plateau of China. Results showed that more Caliche nodules were present at the top of the mountain, mountain ridges, roadsides, edges of ravines, and other high elevation regions, as represented by comparatively higher Caliche nodule coverage (CNC, 11.26–18.28%). Caliche nodules were rarely present in low elevation areas such as the terraced cropland and check dam, as represented by lower CNC (
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Spatial distribution of Caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China
'Elsevier BV', 2018Co-Authors: Tiexiong Gong, Yuanjun Zhu, Ming’an Shao, Zhu, Yj Author), Northwest A&f Univ, State Key Lab Soil Eros Dryland Fanning Loess P, Yangling 71210 China.Abstract:Quantifying the distribution of Caliche nodules in a catchment is a basis toward understanding soil erosion and soil degradation as well as soil-water processes in the soil containing Caliche nodules. In this study, field surveys and soil sampling were coupled with spatial and statistical analyses along with image processing to investigate the spatial distribution of Caliche nodules and their influencing factors in the Liudaogou catchment, the northern Loess Plateau of China. Results showed that more Caliche nodules were present at the top of the mountain, mountain ridges, roadsides, edges of ravines, and other high elevation regions, as represented by comparatively higher Caliche nodule coverage (CNC, 11.26-18.28%). Caliche nodules were rarely present in low elevation areas such as the terraced cropland and check dam, as represented by lower CNC ( < 2.55%). More than 65% of the total Caliche nodules had a diameter of 10-50 mm. The Caliche nodule coverage and diameter showed strong spatial dependence. The CNC was significantly related to the slope gradient and vegetation cover (P < 0.01), and the Caliche nodule diameter (CND) was significantly related to the elevation (P < 0.01). Two simple models were established to predict the CNC and CND values given the parameters of slope gradient and vegetation cover. The validation of the models showed relatively high accuracy. These findings quantify Caliche nodule distribution in a catchment for the first time, and may benefit the assessment of soil erosion and soil degradation in this special soil in the Loess Plateau
Luis A. Cisternas - One of the best experts on this subject based on the ideXlab platform.
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Heap Leaching of Caliche Ore. Modeling of a Multicomponent System with Particle Size Distribution
MDPI AG, 2017Co-Authors: Javier I Ordonez, Luis Moreno, Alicia Condori, Luis A. CisternasAbstract:Caliche is a mineral exploited in northern Chile, from which iodine and Nitrate salts (saltpeter) are obtained. This ore is the most important source of iodine in the world and is processed mainly by heap leaching using water as a leaching agent. Heap leaching of Caliche ore is carried out by the stacking of ROM (Run-Of-Mine) material, where the particle size distribution covers a wide range, from a few millimeters up to several decimeters, even diameters about 1 m. During the leaching, the multiple soluble species of Caliche, which can reach total fractions larger than 40%, are dissolved at different rates, mainly controlled by their solubilities. When it occurs and unlike most other leachable ores, the particle size diminishes. The leaching modeling of several soluble species of Caliche has been recently addressed; however, one of the main assumptions is the idealization that the heap is composed of particles of the same size. The present work aims to complement the previously formulated phenomenological models for Caliche ore leaching, through a model that considers the simultaneous dissolution of two species from Caliche with three different particle sizes. These two water-soluble species have different solubilities and dissolution rates and the conceptual model considers that both species are dissolved at the particle surface. When the most soluble species is being depleted, the particle collapses, leaving a remaining fraction of the less soluble species together with insoluble material. The less soluble species is now being dissolved from the collapsed material. This article also includes the experimental verification of the conceptual model using data obtained from column leaching tests conducted for this purpose, focusing on the dissolution of two soluble species: Nitrate and Magnesium
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leaching of coarse Caliche ore experiment and modelling
Brazilian Journal of Chemical Engineering, 2016Co-Authors: S Valdez, Luis A. Cisternas, Luis Moreno, Javier I OrdonezAbstract:Heap leaching of Caliche ores is frequently performed with run-of-mine (ROM) material, which includes rocks of very different sizes; however, most of the experimental data are obtained using small ...
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use of discharged brine from reverse osmosis plant in heap leaching opportunity for Caliche mining industry
Hydrometallurgy, 2015Co-Authors: Javier I Ordonez, Luis Moreno, Jorge F Gonzalez, Luis A. CisternasAbstract:Caliche is a highly water-soluble mineral that is exploited in northern Chile for its valuable content of iodine and nitrate, which are used in technological, medical, agriculture, dietary, and industrial applications. The processing of this mineral is through vat or heap leaching, where the species are dissolved using mainly fresh water and intermediate solutions. Since the deposits are located in zones with scarce water availability, one of the challenges for this industry is the search for new sustainable sources of water to face the process requirements. The use of groundwater sources by the mining industry has affected the domestic water supply for the nearest populations, increasing the need for new water alternatives as desalination of seawater by reverse osmosis (RO). A disadvantage of this method is the generation and discharge of highly concentrated brines to sea. In this work, the feasibility to use RO brine for Caliche leaching was empirically proved through column-leaching experiments, which showed high recoveries of iodine and nitrate. Therefore, the use of RO brines may be an interesting option, on one side, for covering the increasing demand of processing water and, on the other side, to diminish the negative impact of brine disposal to the sea.
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modeling validation of Caliche ore leaching using seawater
International Journal of Mineral Processing, 2014Co-Authors: Javier I Ordonez, Luis Moreno, Mario E. Mellado, Luis A. CisternasAbstract:Leaching column experiments of Caliche were performed using seawater as the leaching agent because the Caliche deposits are located in Northern Chile where water resources are scarce. The use of seawater without desalination is an attractive alternative for mining operations. The experimental recoveries of different ions were modeled using a hybrid model, which uses empirical information and fundamental principles. The following ions were considered: nitrate, iodine, sulfate, chloride, sodium, potassium and magnesium. The model explicitly considers different column heights, irrigation rates, and leaching agents. A sensitivity analysis showed that parameters associated with the particle level predominantly determined the calculated recoveries. The predictive capability was also tested, and the results were generally good, except for the sulfate ion, the dissolution of which was controlled by the presence of other ions.
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seawater leaching of Caliche mineral in column experiments
Hydrometallurgy, 2013Co-Authors: Javier I Ordonez, Luis Moreno, Edelmira D. Gálvez, Luis A. CisternasAbstract:Caliche is a mineral that contains a high fraction of soluble minerals and that is exploited in Northern Chile through vat or heap leaching for the production of iodine and nitrate. In this zone, the water availability is scarce, being a critical issue for the mining industries and whereby the use of other leaching agents as seawater may be a viable alternative. For this reason in the present study, column-leaching experiments using seawater were performed, including different irrigation rates and column heights. It is found that the highly soluble minerals such as nitrate and iodate are rapidly leached, while for other minerals like sulphate and chloride, the outlet concentration increased once that part of the sodium has been removed. Crystals of sodium sulphate were found at the column bottom, when this was dismantled. An existing phenomenological model (Galvez et al., 2012) was used to analyse the changes of concentration of nitrate and iodine (as iodate) with a good agreement between the experiments and the simulations. On the other hand, for sulphate and chloride a new model was developed, which takes into account the dissolution and precipitation phenomena of these ions. The model was able to capture the trends observed in the experiments for the outlet concentrations of the modelled ions.
Yuanjun Zhu - One of the best experts on this subject based on the ideXlab platform.
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spatial distribution of Caliche nodules in surface soil and their influencing factors in the liudaogou catchment of the northern loess plateau china
Geoderma, 2018Co-Authors: Tiexiong Gong, Yuanjun Zhu, Mingan ShaoAbstract:Abstract Quantifying the distribution of Caliche nodules in a catchment is a basis toward understanding soil erosion and soil degradation as well as soil-water processes in the soil containing Caliche nodules. In this study, field surveys and soil sampling were coupled with spatial and statistical analyses along with image processing to investigate the spatial distribution of Caliche nodules and their influencing factors in the Liudaogou catchment, the northern Loess Plateau of China. Results showed that more Caliche nodules were present at the top of the mountain, mountain ridges, roadsides, edges of ravines, and other high elevation regions, as represented by comparatively higher Caliche nodule coverage (CNC, 11.26–18.28%). Caliche nodules were rarely present in low elevation areas such as the terraced cropland and check dam, as represented by lower CNC (
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Spatial distribution of Caliche nodules in surface soil and their influencing factors in the Liudaogou catchment of the northern Loess Plateau, China
'Elsevier BV', 2018Co-Authors: Tiexiong Gong, Yuanjun Zhu, Ming’an Shao, Zhu, Yj Author), Northwest A&f Univ, State Key Lab Soil Eros Dryland Fanning Loess P, Yangling 71210 China.Abstract:Quantifying the distribution of Caliche nodules in a catchment is a basis toward understanding soil erosion and soil degradation as well as soil-water processes in the soil containing Caliche nodules. In this study, field surveys and soil sampling were coupled with spatial and statistical analyses along with image processing to investigate the spatial distribution of Caliche nodules and their influencing factors in the Liudaogou catchment, the northern Loess Plateau of China. Results showed that more Caliche nodules were present at the top of the mountain, mountain ridges, roadsides, edges of ravines, and other high elevation regions, as represented by comparatively higher Caliche nodule coverage (CNC, 11.26-18.28%). Caliche nodules were rarely present in low elevation areas such as the terraced cropland and check dam, as represented by lower CNC ( < 2.55%). More than 65% of the total Caliche nodules had a diameter of 10-50 mm. The Caliche nodule coverage and diameter showed strong spatial dependence. The CNC was significantly related to the slope gradient and vegetation cover (P < 0.01), and the Caliche nodule diameter (CND) was significantly related to the elevation (P < 0.01). Two simple models were established to predict the CNC and CND values given the parameters of slope gradient and vegetation cover. The validation of the models showed relatively high accuracy. These findings quantify Caliche nodule distribution in a catchment for the first time, and may benefit the assessment of soil erosion and soil degradation in this special soil in the Loess Plateau
Mingan Shao - One of the best experts on this subject based on the ideXlab platform.
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spatial distribution of Caliche nodules in surface soil and their influencing factors in the liudaogou catchment of the northern loess plateau china
Geoderma, 2018Co-Authors: Tiexiong Gong, Yuanjun Zhu, Mingan ShaoAbstract:Abstract Quantifying the distribution of Caliche nodules in a catchment is a basis toward understanding soil erosion and soil degradation as well as soil-water processes in the soil containing Caliche nodules. In this study, field surveys and soil sampling were coupled with spatial and statistical analyses along with image processing to investigate the spatial distribution of Caliche nodules and their influencing factors in the Liudaogou catchment, the northern Loess Plateau of China. Results showed that more Caliche nodules were present at the top of the mountain, mountain ridges, roadsides, edges of ravines, and other high elevation regions, as represented by comparatively higher Caliche nodule coverage (CNC, 11.26–18.28%). Caliche nodules were rarely present in low elevation areas such as the terraced cropland and check dam, as represented by lower CNC (
Luis Moreno - One of the best experts on this subject based on the ideXlab platform.
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Heap Leaching of Caliche Ore. Modeling of a Multicomponent System with Particle Size Distribution
MDPI AG, 2017Co-Authors: Javier I Ordonez, Luis Moreno, Alicia Condori, Luis A. CisternasAbstract:Caliche is a mineral exploited in northern Chile, from which iodine and Nitrate salts (saltpeter) are obtained. This ore is the most important source of iodine in the world and is processed mainly by heap leaching using water as a leaching agent. Heap leaching of Caliche ore is carried out by the stacking of ROM (Run-Of-Mine) material, where the particle size distribution covers a wide range, from a few millimeters up to several decimeters, even diameters about 1 m. During the leaching, the multiple soluble species of Caliche, which can reach total fractions larger than 40%, are dissolved at different rates, mainly controlled by their solubilities. When it occurs and unlike most other leachable ores, the particle size diminishes. The leaching modeling of several soluble species of Caliche has been recently addressed; however, one of the main assumptions is the idealization that the heap is composed of particles of the same size. The present work aims to complement the previously formulated phenomenological models for Caliche ore leaching, through a model that considers the simultaneous dissolution of two species from Caliche with three different particle sizes. These two water-soluble species have different solubilities and dissolution rates and the conceptual model considers that both species are dissolved at the particle surface. When the most soluble species is being depleted, the particle collapses, leaving a remaining fraction of the less soluble species together with insoluble material. The less soluble species is now being dissolved from the collapsed material. This article also includes the experimental verification of the conceptual model using data obtained from column leaching tests conducted for this purpose, focusing on the dissolution of two soluble species: Nitrate and Magnesium
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leaching of coarse Caliche ore experiment and modelling
Brazilian Journal of Chemical Engineering, 2016Co-Authors: S Valdez, Luis A. Cisternas, Luis Moreno, Javier I OrdonezAbstract:Heap leaching of Caliche ores is frequently performed with run-of-mine (ROM) material, which includes rocks of very different sizes; however, most of the experimental data are obtained using small ...
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use of discharged brine from reverse osmosis plant in heap leaching opportunity for Caliche mining industry
Hydrometallurgy, 2015Co-Authors: Javier I Ordonez, Luis Moreno, Jorge F Gonzalez, Luis A. CisternasAbstract:Caliche is a highly water-soluble mineral that is exploited in northern Chile for its valuable content of iodine and nitrate, which are used in technological, medical, agriculture, dietary, and industrial applications. The processing of this mineral is through vat or heap leaching, where the species are dissolved using mainly fresh water and intermediate solutions. Since the deposits are located in zones with scarce water availability, one of the challenges for this industry is the search for new sustainable sources of water to face the process requirements. The use of groundwater sources by the mining industry has affected the domestic water supply for the nearest populations, increasing the need for new water alternatives as desalination of seawater by reverse osmosis (RO). A disadvantage of this method is the generation and discharge of highly concentrated brines to sea. In this work, the feasibility to use RO brine for Caliche leaching was empirically proved through column-leaching experiments, which showed high recoveries of iodine and nitrate. Therefore, the use of RO brines may be an interesting option, on one side, for covering the increasing demand of processing water and, on the other side, to diminish the negative impact of brine disposal to the sea.
-
modeling validation of Caliche ore leaching using seawater
International Journal of Mineral Processing, 2014Co-Authors: Javier I Ordonez, Luis Moreno, Mario E. Mellado, Luis A. CisternasAbstract:Leaching column experiments of Caliche were performed using seawater as the leaching agent because the Caliche deposits are located in Northern Chile where water resources are scarce. The use of seawater without desalination is an attractive alternative for mining operations. The experimental recoveries of different ions were modeled using a hybrid model, which uses empirical information and fundamental principles. The following ions were considered: nitrate, iodine, sulfate, chloride, sodium, potassium and magnesium. The model explicitly considers different column heights, irrigation rates, and leaching agents. A sensitivity analysis showed that parameters associated with the particle level predominantly determined the calculated recoveries. The predictive capability was also tested, and the results were generally good, except for the sulfate ion, the dissolution of which was controlled by the presence of other ions.
-
seawater leaching of Caliche mineral in column experiments
Hydrometallurgy, 2013Co-Authors: Javier I Ordonez, Luis Moreno, Edelmira D. Gálvez, Luis A. CisternasAbstract:Caliche is a mineral that contains a high fraction of soluble minerals and that is exploited in Northern Chile through vat or heap leaching for the production of iodine and nitrate. In this zone, the water availability is scarce, being a critical issue for the mining industries and whereby the use of other leaching agents as seawater may be a viable alternative. For this reason in the present study, column-leaching experiments using seawater were performed, including different irrigation rates and column heights. It is found that the highly soluble minerals such as nitrate and iodate are rapidly leached, while for other minerals like sulphate and chloride, the outlet concentration increased once that part of the sodium has been removed. Crystals of sodium sulphate were found at the column bottom, when this was dismantled. An existing phenomenological model (Galvez et al., 2012) was used to analyse the changes of concentration of nitrate and iodine (as iodate) with a good agreement between the experiments and the simulations. On the other hand, for sulphate and chloride a new model was developed, which takes into account the dissolution and precipitation phenomena of these ions. The model was able to capture the trends observed in the experiments for the outlet concentrations of the modelled ions.
