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.

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.

scholarly journals Intensification of Sulfuric Acid Leaching of Altered Ilmenite via Adding Fluoride Activator

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1922
Author(s):  
Anastasiia V. Dubenko ◽  
Mykola V. Nikolenko ◽  
Oleksandr O. Pasenko ◽  
Andrii Kostyniuk ◽  
Blaž Likozar
Keyword(s):  
Sulfuric Acid ◽  
Sulfuric Acid Concentration ◽  
Reaction Medium ◽  
Acid Leaching ◽  
Raw Material ◽  
Molar Ratio ◽  
Main Stage ◽  
Sulfuric Acid Leaching ◽  
Fluoride Ions ◽  
Leaching Process

A new method of altered ilmenite processing has been studied. In this method, sulfuric acid is used as the reaction medium of the process, and fluoride ions are activators of the dissolving process of the rutile part of the ore raw material. The regression model of the sulfate–fluoride leaching process was developed and analyzed by using the response surface method of 23 matrix. The obtained model is adequate and well describes the studied process. The influence of Ti:F molar ratio, temperature, and sulfuric acid concentration on the leaching process are investigated in this work in order to optimize the studied process. It is experimentally proved that leaching at temperatures above 100 °C, at a molar ratio of Ti:F of more than 1:2, and the use of solutions of sulfuric acid with concentrations of more than 85 wt.% is not optimal because the extraction degree of titanium is reduced. The intensification of the process of sulfuric acid leaching by dividing the main stage of chemical dissolution of ilmenite into two stages was proposed. This method allows to leach up to 95.9% of titanium, which is 1.6–1.9 times higher in comparison with the classical technology of leaching altered ilmenite.

Extraction of vanadium from converter slag by two-step sulfuric acid leaching process

2018 ◽  
Vol 170 ◽  
pp. 1089-1101 ◽  
Author(s):  
Junyi Xiang ◽  
Qingyun Huang ◽  
Xuewei Lv ◽  
Chenguang Bai
Keyword(s):  
Sulfuric Acid ◽  
Converter Slag ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Leaching Process

scholarly journals Performance of Sulfuric Acid Leaching of Titanium from Titanium-Bearing Electric Furnace Slag

2016 ◽  
Vol 5 (4) ◽  
pp. 1 ◽  
Author(s):  
XiaoMing Qu ◽  
YuFeng Guo ◽  
FuQiang Zheng ◽  
Tao Jiang ◽  
GuanZhou Qiu
Keyword(s):  
Sulfuric Acid ◽  
Electric Furnace ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Water Leaching ◽  
Experimental Conditions ◽  
Leaching Process ◽  
Leaching Residue ◽  
Furnace Slag

<p class="1Body">The sulfuric acid leaching of titanium from titanium-bearing electric furnace slag (TEFS) was investigated under different experimental conditions. In the sulfuric acid leaching process, the M<sub>x</sub>Ti<sub>3-x</sub>O<sub>5</sub>(0≤x≤2) and diopside could react with sulfuric acid. The optimum conditions of sulfuric acid leaching process were particle size at &lt; 0.045mm, sulfuric acid concentration at 90 wt.%, acid/slag mass ratio at 1.6:1, feeding temperature at 120 °C, reaction temperature at 220 °C, reaction time at 120minute, curing at 200°C for 120 minute. The [TiO<sub>2</sub>] concentration of the water leaching was 150 g/L, and leaching temperature at 60℃for 120 minute. Ti extraction could reach 84.29 %. F of titanium-bearing solution was 2.15, and the Ti<sup>3+</sup>/TiO<sub>2</sub> of the titanium-bearing solution was 0.068. The TiO<sub>2</sub> content of the leaching residue was 18.32 wt.%. The main mineral phases of the leaching residue were calcium sulphate, spinel, diopside and little M<sub>x</sub>Ti<sub>3-x</sub>O<sub>5</sub>.</p>

scholarly journals Thermodynamics and Kinetics of Sulfuric Acid Leaching Transformation of Rare Earth Fluoride Molten Salt Electrolysis Slag

2021 ◽  
Vol 9 ◽  
Author(s):  
Lijie Chen ◽  
Jiacong Xu ◽  
Xiaoqiang Yu ◽  
Lei Tian ◽  
Ruixiang Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Sulfuric Acid ◽  
Molten Salt ◽  
Acid Concentration ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Rare Earth Fluoride ◽  
Leaching Process ◽  
Earth Fluoride

Rare earth element recovery in molten salt electrolysis is approximately between 91 and 93%, whereof 8% is lost in waste molten salt slag. Presently, minimal research has been conducted on the technology for recycling waste rare earth molten salt slag, which is either discarded as industrial garbage or mixed with waste slag into qualified molten salt. The development of a new approach toward the effective treatment of rare earth fluoride molten salt electrolytic slag, which can recycle the remaining rare earth and improve the utilization rate, is essential. Herein, weak magnetic iron separation, sulfuric acid leaching transformation, water leaching, hydrogen fluoride water absorption, and cycle precipitation of rare earth are used to recover rare earth from their fluoride molten salt electrolytic slag, wherein the thermodynamic and kinetic processes of sulfuric acid leaching transformation are emphatically studied. Thermodynamic results show that temperature has a great influence on sulfuric acid leaching. With rising temperature, the equilibrium constant of the reaction gradually increases, and the stable interval of NdF3 decreases, while that of Nd3+ increases, indicating that high temperature is conducive to the sulfuric acid leaching process, whereof the kinetic results reveal that the activation energy E of Nd transformation is 41.57 kJ/mol, which indicates that the sulfuric acid leaching process is controlled by interfacial chemical reaction. According to the Nd transformation rate equation in the sulfuric acid leaching process of rare earth fluoride molten salt electrolytic slag under different particle size conditions, it is determinable that with the decrease of particle size, the reaction rate increases accordingly, while strengthening the leaching kinetic process. According to the equation of Nd transformation rate in the sulfuric acid leaching process under different sulfuric acid concentration conditions, the reaction series of sulfuric acid concentration K = 6.4, which is greater than 1, indicating that increasing sulfuric acid concentration can change the kinetic-control region and strengthen the kinetic process.

Study on recycling and leaching valuable elements from Bayan Obo tailings

2019 ◽  
Vol 116 (1) ◽  
pp. 114 ◽  
Author(s):  
Bo Zhang ◽  
Xiangxin Xue ◽  
Xiaowei Huang ◽  
He Yang ◽  
Gongjin Chen
Keyword(s):  
Sulfuric Acid ◽  
Magnetic Separation ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Iron Concentrate ◽  
Solid Ratio ◽  
Leaching Process ◽  
Roasting Process ◽  
Bayan Obo ◽  
Coal Tailings

A novel process for recovering iron, niobium and scandium from Bayan Obo tailings has been developed. In this paper, the treatment of Bayan Obo tailings by Ca(OH)2-coal roasting and sulfuric acid leaching process was investigated. In the Ca(OH)2-coal roasting process, niobium-bearing minerals are converted to CaTiO3 structure of Ca(Ti0.8,Fe0.1,Nb0.1)O3 and Ca2Nb2O7 which are soluble in sulfuric acid. The pyroxene and amphibole that are Sc-bearing silicates are mainly decomposed and reduced into metallic iron which can be recycled by weak magnetic separation. Scandium in the silicates is converted to Sc2O3. In the sulfuric acid leaching process, Ca(Ti0.8,Fe0.1,Nb0.1)O3 and Ca2Nb2O7 are converted to Nb(OH)5 that could easily dissolve in sulfuric acid by dissociating into Nb(OH)4+ and OH− when Sc2O3 is dissolved into heat sulfuric acid. Bayan Obo tailings were roasted with Ca(OH)2-coal at elevated temperature, followed by magnetic separation and sulfuric acid leaching. The optimized experimental parameters are proposed as follows: Ca(OH)2-coal-tailings mass ratio of 20: 5: 100; roasting at 1200 °C for 2 h; the magnetic field (magnetic separation) of 270 mT; the liquid-solid ratio of 4:1 (ml/g); leaching at 245 °C for 1 h. Iron concentrate with a grade of 88.39% and a recovery rate of 91.92% is obtained. The leaching results show that the leaching rates of niobium and scandium could achieve 95.52% and 95.75%, respectively.

Recovery of Nickel and Cobalt from Dimethyldithiocarbamate Precipitation of Pyrolusite Leaching Process

2013 ◽  
Vol 634-638 ◽  
pp. 258-262 ◽  
Author(s):  
Hai Feng Su ◽  
Bo Ji Li ◽  
Qing Lu ◽  
Yan Xuan Wen ◽  
Jing Su
Keyword(s):  
Sulfuric Acid ◽  
Nitric Acid ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Leaching Process ◽  
Sulfuric Acid Medium ◽  
Cobalt Recovery ◽  
Reductive Leaching ◽  
High Nickel ◽  
Leaching Condition

Dimethyldithiocarbamate precipitation is a secondary resource containing nickel and cobalt, which are formed by adding sodium dimethyldithiocarbamate to purify the neutralized filtrate of pyrolusite reductive leaching process. The extraction of nickel and cobalt from dimethyldithiocarbamate precipitation was investigated using nitric acid as oxidant in dilute sulfuric acid medium in this paper. The effects of concentrations of nitric acid and sulfuric acid, leaching temperature as well as reaction time were discussed. The results showed that high nickel and cobalt recovery could be obtained by analyzing the leaching efficiencies of nickel and cobalt during the leaching process. The optimal leaching condition was 1.47 mol/L H2SO4 and 1.16 mol/L HNO3 for 30 min at 45 °C while using particles smaller than 0.420 mm. And the leaching efficiencies were 98% for Co and 95% for Ni, respectively.

scholarly journals Recovery of Magnesium from Ferronickel Slag to Prepare Magnesium Oxide by Sulfuric Acid Leaching

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1375
Author(s):  
Juan Yang ◽  
Xuqin Duan ◽  
Lingchuan Liu ◽  
Huifen Yang ◽  
Xiaocui Jiang
Keyword(s):  
Sulfuric Acid ◽  
Magnesium Oxide ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Magnesium Carbonate ◽  
Leaching Rate ◽  
Sulfuric Acid Leaching ◽  
Leaching Process ◽  
Interactive Behavior ◽  
Ferronickel Slag

This paper provides a technical approach for efficiently recovering Mg from ferronickel slag to produce high-quality magnesium oxide (MgO) by using the sulfuric acid leaching method under atmospheric pressure. The leaching rate of magnesium is 84.97% after a typical one-step acid leaching process, which is because Mg in FNS mainly exists in the forsterite (Mg2SiO4) phase, which is chemically stable. In order to increase the leaching rate, a two-step acid leaching process was proposed in this work, and the overall leaching rate reached up to 95.82% under optimized conditions. The response surface methodology analysis for parameter optimization and Mg leaching rules revealed that temperature was the most critical factor affecting the Mg leaching rate when the sulfuric acid concentration was higher than 2 mol/L, followed by acid leaching time. Furthermore, interactive behavior also existed between the leaching temperature and leaching time. The leaching kinetics of magnesium from FNS followed a shrinkage-nuclear-reaction model with composite control, which were chemically controlled at lower temperatures and diffusion controlled at higher temperatures; the corresponding apparent activation energy was 19.57 kJ/mol. The leachate can be used to obtain spherical-like alkali magnesium carbonate particles with diameters of 5–10 μm at 97.62% purity. By using a further calcination process, the basic magnesium carbonate can be converted into a light magnesium oxide powder with a particle size of 2–5 μm (MgO content 94.85%), which can fulfill first-level quality standards for industrial magnesium oxide in China.

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
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