Prediction of leaching rate in heap leaching process by grey dynamic model GDM(1,1)

2008 ◽  
Vol 29 (4) ◽  
pp. 541-548 ◽  
Author(s):  
Jin-zhi Liu ◽  
Ai-xiang Wu
Keyword(s):  
Dynamic Model ◽  
Heap Leaching ◽  
Leaching Rate ◽  
Leaching Process

Experimental Study on Sulfuric Acid Leaching Behavior of Chromite with Different Temperature

2011 ◽  
Vol 361-363 ◽  
pp. 628-631 ◽  
Author(s):  
Cheng Jun Liu ◽  
Jie Qi ◽  
Mao Fa Jiang
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Raw Material ◽  
Leaching Rate ◽  
Sulfuric Acid Leaching ◽  
Leaching Process ◽  
Pollution Problem ◽  
Environmental Pollution Problem ◽  
Leaching Solution ◽  
Leaching Residue

Utilizing Pakistan chromite as raw material, the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of atmospheric pressure and the addition of oxidant A. And the leaching rate of chromium and iron would be 98.5% and 71.9%, respectively. The sulfuric acid leaching processes with different temperature were systematically studied by chemical analysis and phase analysis. The results showed that, with the increase of reaction temperature, the leaching rate of chromium would increase gradually, but the leaching rate of iron increased at first and then decreases and reached its maximum at 140°C. When the temperature > 160°C, the phases of the leaching residue were magnesium iron silicate and a few of silica, no chromohercynite, chrompicotite and magnesioferrite existed in the chromite. The leaching solution of sulfuric acid leaching process could be used for preparing the basic chrome sulfate, and there is no Cr6+ in the leaching residue and solution. The results would provide theoretical guidance for solving environmental pollution problem of Cr6+ in traditional chromate production process.

The Modeling and Control of Leaching Rate in Nickel Stir Leaching Process of Sulfuric Acid

2012 ◽  
Vol 485 ◽  
pp. 165-168
Author(s):  
Qiang Li ◽  
Cheng Zhi Yang ◽  
Wen Bo Zhang ◽  
Yang Yu
Keyword(s):  
Computer Simulation ◽  
Sulfuric Acid ◽  
Predictive Control ◽  
Pid Control ◽  
Rate Control ◽  
Leaching Rate ◽  
Modeling And Control ◽  
Leaching Process ◽  
And Control ◽  
Nickel Leaching

Leaching rate is one of the key parameters in the nickel stir leaching process of sulfuric acid and it is hard to online measure directly due to a lot of uncertain facts. In this paper, the prediction model of nickel leaching rate is established by least squares identification method. A controller combining predictive control(PFC) and PID control is designed to control nickel leaching rate in stir leaching process of sulfuric acid and better results of leaching rate control is proved by computer simulation.

Experimental Study on Zinc Leaching of Blast Furnace Gas Ash by Ammonia Leaching

2014 ◽  
Vol 962-965 ◽  
pp. 780-783
Author(s):  
Jie Wang ◽  
Wei Xiong ◽  
Bao Ping Zhang
Keyword(s):  
Blast Furnace ◽  
Removal Rate ◽  
Influence Factors ◽  
Environmental Benefits ◽  
Main Task ◽  
Leaching Rate ◽  
Iron And Steel ◽  
Leaching Process ◽  
Blast Furnace Gas ◽  
Ammonia Leaching

Blast furnace gas ash is one of the main solid wastes in iron and steel enterprise. The recovery of zinc from gas ash can result in considerable economic and environmental benefits. The effect of NH3/NH4+, L/S, [NH3]T and leaching time on the zinc leaching rate of blast furnace gas ash by using ammonia leaching process had been investigated in this paper. The results show that L/S and NH3/NH4+ are the main influence factors under the experimental condition. The optimal conditions for leaching process are: NH3/NH4+=2:1, L/S=4:1, [NH3]T =5mol/L, and the leaching time is 3 hours. The zinc leaching rate is 82.84% under the optimized conditions. The lead content in leaching solution is high, so the main task is to improve the removal rate of lead in the purification process.

Oxygen Pressure Acid Leaching of Vanadium Slag

2011 ◽  
Vol 79 ◽  
pp. 242-247 ◽  
Author(s):  
Wang Zhong Mu ◽  
Ting An Zhang ◽  
Zhi He Dou ◽  
Guo Zhi Lü ◽  
Lan Hu ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Acid Leaching ◽  
Leaching Rate ◽  
Vanadium Slag ◽  
Solid Ratio ◽  
Leaching Process ◽  
Oxygen Pressure Acid Leaching ◽  
Effects Of Temperature ◽  
Pressure Acid Leaching ◽  
Single Factor Experiment

Oxygen pressure acid leaching process was used to extract vanadium from vanadium slag (Panzhihua steelmaking plant of China). The single factor experiment was finished and the effects of temperature, leaching time, liquid to solid ratio, stirring speed, initial concentration of sulfuric acid, and were investigated on the leaching rate of vanadium, titanium and iron. The leachate and residue were characterized by ICP, XRF, XRD, SEM and EDX. The experiment results indicate when temperature is 140 °C, leaching time is 120 min, liquid to solid ratio is 20:1(ml:g), stirring speed is 500 rpm, initial acid concentration is 200 g/L, oxygen partial pressure is 0.5 MPa, and particle size is -0.075~+0.055 mm, leaching rate of vanadium is 97.89% and the content of vanadium in the residue is 0.586%. Leaching rate of titanium and iron is 12.78% and 94.45% respectively. Vanadium could be extracted effectively through the oxygen pressure acid leaching process.

Study on the Gold Leaching Process by Potassium Ferricyanide

2015 ◽  
Vol 814 ◽  
pp. 273-277
Author(s):  
Ping Tang ◽  
Jing Liu ◽  
Min Wei Song ◽  
Hai Ping Yu ◽  
Xu Zhang
Keyword(s):  
Room Temperature ◽  
Potassium Ferricyanide ◽  
Process Conditions ◽  
Leaching Rate ◽  
Gold Leaching ◽  
Solid Ratio ◽  
Leaching Process ◽  
Refractory Gold ◽  
Object Of Study ◽  
High Arsenic

The traditional gold leaching method is cyanidation, which carries serious security and environmental problems. More and more attention is paid to the research on non-cyanide process. A high-arsenic-and-sulphur refractory gold concentrate in Sichuan was taken as the object of study. After the roasting-oxidation pretreatment of the sample, potassium ferricyanide was adopted to carry on the process experiment on gold-leaching. The leaching results as well as correlative process conditions were both investigated. The results showed that good leaching effects could be achieved by potassium ferricyanide. When the amount of potassium ferricyanide was 60g/L, the concentration of NaOH 0.2mol/L, the liquid-solid ratio 6:1 and the leaching process at room temperature lasted for 20h, the gold leaching rate reached 88.1%. If the leaching aid CaO2 is added simultaneously, it can contribute to the gold leaching. When the amount of CaO2 was 3g/L, the gold leaching rate increased to more than 94%, the amount of potassium ferricyanide decreased to 50g/L and the leaching time reduced to 14h.

scholarly journals Assessing a two-stage heap leaching process for Platreef flotation concentrate

2012 ◽  
Vol 129-130 ◽  
pp. 74-81 ◽  
Author(s):  
James M. Mwase ◽  
Jochen Petersen ◽  
Jacques J. Eksteen
Keyword(s):  
Heap Leaching ◽  
Two Stage ◽  
Flotation Concentrate ◽  
Leaching Process

Column Bioleaching of Low Grade Copper Sulfide Ore at Extreme Conditions for Most Mineral Processing Bacteria

2013 ◽  
Vol 825 ◽  
pp. 318-321 ◽  
Author(s):  
Gang Zou ◽  
Zeng Ling Wu ◽  
Xiao Kang Lai ◽  
Lai Chang Zou ◽  
Ren Man Ruan ◽  
...  
Keyword(s):  
Iron Concentration ◽  
Heap Leaching ◽  
Operating Conditions ◽  
Industrial Plant ◽  
Copper Extraction ◽  
Low Grade ◽  
Extreme Conditions ◽  
Leaching Rate ◽  
Copper Leaching ◽  
Leaching Efficiency

This study is prompted by the high leaching efficiency of Zijinshan copper bio-heap leaching industrial plant. Bioleaching columns with 100 mm diameter and 1 m height were used to investigate copper bioleaching at different operating conditions. Elevated temperature, high total iron concentration and high acidity significantly increased copper leaching rate as determined by solution and residue assays. At 60 °C with 50 g/L iron (initial Fe3+/Fe2+ gram ratio 2.5), pH 1.0 and no aeration, copper extraction was achieved 90% after 60 days. However, at 30°C, 5 g/L total Fe, pH 1.5 and no aeration, copper extraction reached 80% and 85% after 90 and 200 days, respectively. Real-time PCR assay showed that only 105 cells/ml and 2×105 cells/g are in solution and on the ore surface at the condition of 60 °C 50 g/L iron and pH 1.0, respectively. In addition, a similar leaching rate was observed in the tests with and without inoculation. The column without inoculation was directly irrigated with acid mine drainage (AMD). Our results indicate high copper leaching efficiency at extreme conditions for mineral oxidizing bacteria. Inoculation and aeration are not necessary in Zijinshan copper mine bio-heap leaching process.

scholarly journals Ozone Ice as an Oxygen Release Reagent for Heap Leaching of Gold Ore

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1251
Author(s):  
Ziyuan Liu ◽  
Jue Kou ◽  
Yi Xing ◽  
Chunbao Sun ◽  
Peng Liu ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Ozone Concentration ◽  
Heap Leaching ◽  
Oxygen Deficit ◽  
Leaching Rate ◽  
Oxygen Release ◽  
Ice Melting ◽  
Gold Leaching ◽  
Column Leaching ◽  
Rate Of Increase

The issue of poor aeration efficiency and low oxygen transfer in the heap leaching of gold has gained considerable attention. In this study, ozone ice was studied as an oxygen release reagent in the cyanide heap leaching of gold at a low temperature of approximately 5 °C, owing to its effective oxidation and clean and green properties. Quartz Crystal Microbalance with Dissipation (QCM-D) was used to monitor the effect of different ratios of cyanide and oxygen concentrations on the gold leaching rate. The results showed that the leaching rate doubled when the dissolved oxygen (DO) was increased from 8.2 mg/L to 12 mg/L at a relatively high cyanide concentration of 60 mg/L. The release of oxygen during the process of ozone ice melting was analyzed by simulating the oxygen-deficient condition of the ore heap in column leaching. In the first stage of ice melting, the DO in the solution increased dramatically, and the rate of increase improved with increased initial ozone concentration in the ice. In the second stage of ice melting, the rate of increase in the DO of the solution was not significantly affected by the initial ozone concentration in the ice; this was consistent with the decomposition rate of ozone. The addition of ozone ice containing 300 mg/L ozone increased the gold extraction by 4.1% in the ore column leaching experiment, compared to a column with no ozone ice. However, continuously increasing the ozone concentration up to 600 mg/L had no further significant effect, because the dissolved oxygen in the leaching solution reached saturation. The results facilitate a better understanding of the decomposition law of ozone in the melting process of ozone ice and help to improve the oxygen deficit state in gold leaching heaps.

scholarly journals Mechano-Activation and SHS of Difficultly Taken Ore

2014 ◽  
Vol 13 (3-4) ◽  
pp. 189
Author(s):  
O. Bayrakova ◽  
O. Golovchenko ◽  
S. Aknazarov
Keyword(s):  
Mechanical Activation ◽  
Chemical Activation ◽  
Leaching Rate ◽  
Optimal Conditions ◽  
Optimum Conditions ◽  
Activation Time ◽  
Technological Parameters ◽  
Leaching Process ◽  
Grinding Media ◽  
Refractory Ores

Technological parameters of opening refractory ores by mechanical activation which determine remaining and the morphology of the samples after mechanical activation, SHS synthesis and the leaching process has been defined. Mechano-chemical activation of arsenopirita in different modes increases process have been defined. Optimal conditions for activation: time - 30 min at a ratio of grinding media and mineral 2:1. Leaching rate was higher for the activated samples the same amount of time than the original. Extraction of gold for the chosen optimum conditions is 93.2-95 %.

scholarly journals A Decision Support System for Changes in Operation Modes of the Copper Heap Leaching Process

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1025
Author(s):  
Manuel Saldaña ◽  
Purísima Neira ◽  
Víctor Flores ◽  
Pedro Robles ◽  
Carlos Moraga
Keyword(s):  
Decision Making ◽  
Decision Support ◽  
Decision Support System ◽  
Support System ◽  
Operating Mode ◽  
Heap Leaching ◽  
Operating Conditions ◽  
Leaching Process ◽  
Operation Rules ◽  
Copper Heap Leaching

Chilean mining is one of the main productive industries in the country. It plays a critical role in the development of Chile, so process planning is an essential task in achieving high performance. This task involves considering mineral resources and operating conditions to provide an optimal and realistic copper extraction and processing strategy. Performing planning modes of operation requires a significant effort in information generation, analysis, and design. Once the operating mode plans have been made, it is essential to select the most appropriate one. In this context, an intelligent system that supports the planning and decision-making of the operating mode has the potential to improve the copper industry’s performance. In this work, a knowledge-based decision support system for managing the operating mode of the copper heap leaching process is presented. The domain was modeled using an ontology. The interdependence between the variables was encapsulated using a set of operation rules defined by experts in the domain and the process dynamics was modeled utilizing an inference engine (adjusted with data of the mineral feeding and operation rules coded) used to predict (through phenomenological models) the possible consequences of variations in mineral feeding. The work shows an intelligent approach to integrate and process operational data in mining sites, being a novel way to contribute to the decision-making process in complex environments.

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