Comparative Study on Removal of Fe, Al and Ca From MG-Si by Acid Leaching

2012 ◽  
Vol 581-582 ◽  
pp. 831-835
Author(s):  
Yi Mai ◽  
Wen Hui Ma ◽  
Ke Qiang Xie ◽  
Tong Wang ◽  
Hu Zhang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Hydrofluoric Acid ◽  
Removal Rate ◽  
Acid Leaching ◽  
Pressure Leaching ◽  
Impurity Removal ◽  
Mixed Acid ◽  
Iron Aluminum ◽  
High Impurity ◽  
Hydrometallurgical Method

In order to find the most effective hydrometallurgical method of removing iron, aluminum and calcium from MG-Si, a variety of acid leaching methods were presented. The research results show that the order of capacity of metallic impurity removal is HF, HCl, HNO3 and H2SO4. The most effective hydrometallurgical method is the leaching by mixed acid with hydrofluoric acid and sulfuric acid. Removal efficiency of hydrochloric acid pressure leaching can improved as the pressure increases. Sulfuric acid and nitric acid even using high pressure leaching cannot obtain high impurity removal rate. The leaching by hydrofluoric acid or mixed acid containing hydrofluoric acid and sulfuric acid is very effective on removal of iron and aluminum, but less effective on calcium.

Kinetics of Pressure Acid Leaching of Zinc from Zinc Silicate Ore

2011 ◽  
Vol 402 ◽  
pp. 266-271
Author(s):  
Hong Sheng Xu ◽  
Chang Wei ◽  
Cun Xiong Li ◽  
Yan Song ◽  
Zhi Gan Deng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Concentration ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Zinc Silicate ◽  
Diffusion Control ◽  
Pressure Leaching ◽  
Zinc Extraction ◽  
Shrinking Core ◽  
Sulfuric Acid Solutions

The present work is concerned with the kinetic study of pressure leaching of zinc silicate ore in sulfuric acid solutions. The effects of leaching temperature, particle size, sulfuric acid concentration and agitation speed on the zinc extraction were evaluated. The results obtained show that the zinc extraction increases with increasing sulfuric acid concentration and leaching temperature. The leaching kinetics was analyzed by using a shrinking core model with diffusion control given by: 1-2/3x-(1-x)2/3=Kt, which represented well the experimental data. The apparent activation energy was determined to be 44.56kJ/mol at temperatures ranging between 80 and 140°C.

Complex Rare Earth Minerals Sulfate Decomposition Techniques Investigation

2019 ◽  
Vol 946 ◽  
pp. 580-584
Author(s):  
K.D. Naumov ◽  
K.A. Karimov ◽  
A.M. Klyushnikov
Keyword(s):  
Rare Earth ◽  
Sulfuric Acid ◽  
Atmospheric Pressure ◽  
Pressure Leaching ◽  
Decomposition Techniques ◽  
The Third ◽  
Iron Aluminum ◽  
Rare Earth Minerals ◽  
Concentrated Sulfuric Acid ◽  
Major Factors

This article presents a study of Tomtor rare earth ore decomposition. This material contains a lot of valuable components such as REE and niobium (mas., %: 12,8 ΣREO (rare earth oxides), 0.039 Sc, 18.4 P2O5, 9.9 Fe, 9.0 Al, 0.24 ThO2, 8.2 Nb2O5). The study aims to find efficient ways of processing this deposit. Technologies using the sulfuric acid as the main reagent to leach are described in this article. Investigation has three trends. The first trend is agitation leaching at low sulfuric acid concentrations, temperatures up to 95 °C and atmospheric pressure. The second trend is pressure leaching at low sulfuric acid concentrations, high temperatures (up to 180 °C) and high pressure. The third trend is high temperature sulfatization with concentrated sulfuric acid at elevated temperature (up to 180 °C) and atmospheric pressure followed by aqueous leaching. The dependence of target components (rare earth elements, scandium, phosphorus) and the impurity (iron, aluminum, thorium) extractions into solution from major factors was studied.

Research of Leaching Alumina and Iron Oxide from Bayer Red Mud

2012 ◽  
Vol 151 ◽  
pp. 355-359 ◽  
Author(s):  
Rong Rong Lu ◽  
Yi He Zhang ◽  
Feng Shan Zhou ◽  
Xin Ke Wang
Keyword(s):  
Sulfuric Acid ◽  
Iron Oxide ◽  
Hydrochloric Acid ◽  
Red Mud ◽  
Acid Leaching ◽  
Raw Material ◽  
Good Effect ◽  
Mixed Acid ◽  
Leaching Experiments ◽  
Bayer Red Mud

Adopting Bayer red mud as raw material, researching five acid leaching of alumina and iron oxide methods, hydrochloric acid leaching, sulfuric acid leaching, mixed acid leaching and two methods of classification acid leaching, affecting on leaching ratio of Al and Fe in red mud. All the five acid leaching experiments have a good effect on the leaching ratios of alumina and iron oxide. The highest leaching ratios of alumina and iron oxide are 90.1% and 99.0% when the volume of hydrochloric acid and sulfuric acid are 25mL in the mixed acid leaching. Finally, obtain better condition of preparing flocculants solution for water treatment by leaching Fe and Al in red mud.

scholarly journals HYDROMETALLURGICAL NICKEL AND COBALT PRODUCTION FROM LATERITIC ORES: OPTIMIZATION AND COMPARISON OF ATMOSPHERIC PRESSURE LEACHING AND PUG-ROAST-LEACHING PROCESSES

2021 ◽  
Vol 27 (1) ◽  
pp. 17-22
Author(s):  
Serkan Baslayici ◽  
Ozan Coban ◽  
Mehmet Bugdayci ◽  
Mahmut Ercan Acma
Keyword(s):  
Sulfuric Acid ◽  
Atmospheric Pressure ◽  
Chemical Properties ◽  
Acid Leaching ◽  
Pressure Leaching ◽  
Sulfuric Acid Leaching ◽  
Iron Leaching ◽  
Technological Developments ◽  
Cobalt Production ◽  
Leaching Efficiency

Corresponding to the technological developments, production and consumption of nickel have increased greatly over time due to its unique mechanical and chemical properties. Therefore, the production of nickel will always keep its importance. The availability of laterite ores, which are oxide type ores, is 86% of the nickel reserves on the Earth, and the processes used in the production of nickel from sulfide type ores have negative environmental effects. Therefore, recovery of nickel from lateritic ores has become increasingly important in recent years. In this study, the aim was to determine the optimum parameters of nickel and cobalt production from limonite type lateritic nickel ores, which were taken from Manisa Caldag region of Turkey, using atmospheric pressure sulfuric acid leaching and pug-roast-leach process. When the results obtained in these processes were compared, it was found that the Ni leaching efficiency is nearly 8% higher and iron leaching efficiency (contamination) is nearly 4% lower in the pug-roast-leach process. Furthermore, the pug-roast-leach process was completed in 33% lower time compared to the atmospheric pressure sulfuric acid leaching process.

Gallium Arsenide Integrated Circuits Decapsulation Technique Using Mixed Acid Chemistry For Die-Level Failure Analysis

2018 ◽  
Author(s):  
Harold Jeffrey M. Consigo ◽  
Ricardo S. Calanog ◽  
Melissa O. Caseria
Keyword(s):  
Gallium Arsenide ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Integrated Circuits ◽  
Failure Analysis ◽  
Mixed Acid ◽  
Optimum Parameters ◽  
Plastic Package ◽  
Fuming Nitric Acid ◽  
Concentrated Sulfuric Acid

Abstract Gallium Arsenide (GaAs) integrated circuits have become popular these days with superior speed/power products that permit the development of systems that otherwise would have made it impossible or impractical to construct using silicon semiconductors. However, failure analysis remains to be very challenging as GaAs material is easily dissolved when it is reacted with fuming nitric acid used during standard decapsulation process. By utilizing enhanced chemical decapsulation technique with mixture of fuming nitric acid and concentrated sulfuric acid at a low temperature backed with statistical analysis, successful plastic package decapsulation happens to be reproducible mainly for die level failure analysis purposes. The paper aims to develop a chemical decapsulation process with optimum parameters needed to successfully decapsulate plastic molded GaAs integrated circuits for die level failure analysis.

scholarly journals Study on Ultrasonically-Enhanced Sulfuric Acid Leaching of Nickel from Nickel-Containing Residue

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 810
Author(s):  
Zhanyong Guo ◽  
Ping Guo ◽  
Guang Su ◽  
Fachuang Li
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Ultrasonic Waves ◽  
Sulfuric Acid Leaching ◽  
Solid Product ◽  
Leaching Process ◽  
Diffusion Controlled ◽  
Extraction Degree ◽  
Ultrasonic Conditions ◽  
Complex Nickel

In this paper, nickel-containing residue, a typical solid waste produced in the battery production process, was used to study the cavitation characteristics of ultrasonic waves in a liquid–solid reaction. The ultrasonically-enhanced leaching technology for multicomponent and complex nickel-containing residue was studied through systematic ultrasonic-conventional comparative experiments. An ultrasonic leaching kinetics model was established which provided reliable technological guidance and basic theory for the comprehensive utilization of nickel-containing residue. In the study, it was found that ultrasonically-enhanced leaching for 40 min obtained the same result as conventional leaching for 80 min, and the Ni extraction degree reached more than 95%. According to the kinetic fitting of the leaching process, it was found that the sulfuric acid leaching process belonged to the diffusion-controlled model of solid product layers under conventional and ultrasonic conditions, and the activation energy of the reaction was Ea1 = 17.74 kJ/mol and Ea2 = 5.04 kJ/mol, respectively.

scholarly journals Effects of Anodizing Conditions on Thermal Properties of Al 20XX Alloys for Aircraft

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 433
Author(s):  
Junghyun Park ◽  
Kyeongsik Son ◽  
Junghoon Lee ◽  
Donghyun Kim ◽  
Wonsub Chung
Keyword(s):  
Sulfuric Acid ◽  
Heat Dissipation ◽  
Digital Camera ◽  
High Hardness ◽  
Laser Flash ◽  
Mixed Acid ◽  
Aerospace Applications ◽  
Laser Flash Analysis ◽  
Ft Ir ◽  
Optimized Conditions

Anodizing was applied to improve the heat dissipation performance of aluminum (Al) alloys, by forming an oxide layer, such that they could be employed in aerospace applications. The methods employed were hard sulfuric acid (high hardness), soft sulfuric acid (low hardness), boric-sulfuric mixed acid, tin-sulfuric mixed acid, and chromic acid solutions. Each process was completed under optimized conditions. The surface morphology was observed using field emission scanning electron microscopy (FE-SEM) and a digital camera. For the determination of thermal performance, Fourier transform infrared spectroscopy (FT-IR) was used to measure the emissivity at 50 °C, and laser flash analysis (LFA) was utilized to analyze the thermal diffusivity at room temperature to 300 °C. The radiative property of metals is often ignored because of their low emissivity, however, in this research, the emissivity of the metal oxides was found to be higher than that of bare metal series. This study improved the heat dissipation properties by oxidization of Al via the anodizing process.

Removal of Fe(III) from sulfuric acid leaching solution of phosphate ores with bisphosphonic acids

2021 ◽  
pp. 105799
Author(s):  
Chengjin Xu ◽  
Ling Li ◽  
Miaomiao Zhang ◽  
Xiao Meng ◽  
Xiujing Peng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Leaching Solution ◽  
Bisphosphonic Acids ◽  
Phosphate Ores

Sulfuric Acid Leaching of Bangka Indonesia Ilmenite Ore and Ilmenite Decomposed by NaOH

2013 ◽  
Vol 789 ◽  
pp. 522-530 ◽  
Author(s):  
Latifa Hanum Lalasari ◽  
Rudi Subagja ◽  
Akhmad Herman Yuwono ◽  
Florentinus Firdiyono ◽  
Sri Harjanto ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Sulfuric Acid ◽  
Solvent Extraction ◽  
Acid Leaching ◽  
Raw Material ◽  
Key Factors ◽  
Sulfuric Acid Leaching ◽  
Acid Environment

lmenite (FeO.TiO2) ore from Bangka island-Indonesia is a potential raw material for synthesizing titanium dioxide (TiO2), which can be used further as pigmen and photocatalyst. The fabrication of TiO2 particles from ilmenite can be carried out through the solvent extraction using sulfuric acid route. Therefore, the solubility of the ilmenite ore in sulfuric acid environment is one of the key factors to obtain the desired TiO2 particles. The current research is aimed at comparing the solubility of pristine Bangka ilmenite ore with that of precedingly decomposed by sodium hidroxide (NaOH) in pressurized and atmospheric reflux reactors. The dissolution of both precursors was carried out in those reactors under various temperatures of 75, 100, 125, 150 and 175°C. The results showed that the optimum dilution was achieved at 150°C. The obtained recovery of ilmenite was 88.8 % for the pressurized reactor and 75.5% for the atmospheric reflux reactor. The solubility of titanium (Ti) element increased steadily to reach a recovery of 68% at 150°C and decreased significantly afterwards. It was also found that the increase of iron (Fe) element solubility was proportional to the increase of processing temperatures.

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