scholarly journals Study on Extraction Separation of Thioarsenite Acid in Alkaline Solution by CO32--Type Tri-n-Octylmethyl-Ammonium Chloride

2021 ◽  
Vol 8 ◽  
Author(s):  
Kang Yan ◽  
Liping Liu ◽  
Hongxing Zhao ◽  
Lei Tian ◽  
Zhifeng Xu ◽  
...  
Keyword(s):  
Ammonium Chloride ◽  
Organic Phase ◽  
Extraction Rate ◽  
Alkaline Leaching ◽  
Extraction And Separation ◽  
Extraction Separation ◽  
Naoh Solution ◽  
Leaching Solution ◽  
Saturated Nahco ◽  
Formula Type

To overcome the problem of arsenic separation and enrichment from an alkaline leaching solution in arsenic-containing dust, a CO32--type tri-n-octylmethyl-ammonium chloride (TOMAC) method for extracting thioarsenite is proposed in this paper. Considering an alkaline leaching solution as the research object, after vulcanization pretreatment, TOMAC transformation and organic phase saturated extraction capacity were measured, and the extraction mechanism was preliminarily studied. First, Cl−-type quaternary ammonium salt was effectively transformed to HCO3--type by treating organic phase with saturated NaHCO3five times. TOMAC was effectively transformed from HCO3- to CO32- type by alkaline washing with 1.0 mol/l NaOH solution; this washing was repeated thrice. Thereafter, the effects of organic phase composition, phase ratio, extraction time, and temperature on the extraction and separation of arsenic were investigated. The results show that under the conditions of 30% CO32--type TOMAC + 15% sec-octanol + 55% sulfonated kerosene, VO/VA = 1/1, and 5 min extraction at room temperature, the single-stage extraction rate of AsIII is 85.2%. The AsIII concentration in raffinate can be reduced to less than 1.33 × 10−3 mol/l by four-stage countercurrent extraction, and the extraction rate of AsIII can exceed 98.4%.

Modeling the Extraction Rate Coefficient for the Extraction of Yttrium by DEHPA Using Organic-Phase Recycle

2019 ◽  
Vol 37 (6) ◽  
pp. 422-434
Author(s):  
Dave DeSimone ◽  
Natasha Ghezawi ◽  
Thomas Gaetjens ◽  
Robert Counce ◽  
Jack Watson
Keyword(s):  
Organic Phase ◽  
Rate Coefficient ◽  
Extraction Rate

scholarly journals Preparation of Calcium Stannate from Lead Refining Dross by Roast–Leach–Precipitation Process

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 283 ◽  
Author(s):  
Dixiu Wu ◽  
Junwei Han ◽  
Wei Liu ◽  
Fen Jiao ◽  
Wenqing Qin
Keyword(s):  
Precipitation Process ◽  
Lead Smelter ◽  
Solid Ratio ◽  
Lead Refining ◽  
Average Grain Size ◽  
Naoh Solution ◽  
Leaching Solution ◽  
Leaching Parameters ◽  
Optimized Conditions ◽  
Calcium Stannate

Lead refining dross containing plenty of tin and other heavy metals, such as lead and antimony, is considered a hazardous waste generated in large quantities in lead smelter plants. In this study, calcium stannate was synthesized from lead refining dross using sodium carbonate roasting and alkaline leaching followed by precipitation with CaO. The effect of roasting and leaching parameters on the extraction efficiency of tin was investigated. The leaching efficiency of tin reached 94% under the optimized conditions: roasting with 60% Na2CO3 at 1000 °C for 45 min, and leaching using 2 mol/L NaOH solution for 90 min at 85 °C and 8 cm3/g liquid/solid ratio. Furthermore, more than 99% of tin in the leaching solution was precipitated using CaO. Finally, XRD, SEM, and ICP-OES analyses indicated that the final CaSnO3 product had a purity of 95.75% and its average grain size was smaller than 5 μm. The results indicated that the developed method is feasible to produce calcium stannate from lead refining dross.

Extraction of Cesium from an Alkaline Leaching Solution of Spent Catalysts Using an Ion-Exchange Column

1996 ◽  
Vol 31 (7) ◽  
pp. 1001-1010 ◽  
Author(s):  
Nathalie Dumont ◽  
Alain Favre-RÉGuillon ◽  
Branko Dunjic ◽  
Marc Lemaire
Keyword(s):  
Ion Exchange ◽  
Alkaline Leaching ◽  
Exchange Column ◽  
Ion Exchange Column ◽  
Leaching Solution ◽  
Spent Catalysts

Fast separation of Cu2+ and Ni2+ in sulfate solution by Lix984N extraction using a microchannel chip

2018 ◽  
Vol 7 (3) ◽  
pp. 207-216
Author(s):  
Biquan Xiao ◽  
Feng Jiang ◽  
Shaohua Yin ◽  
Libo Zhang ◽  
Jinhui Peng ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Sulfate Solution ◽  
Extraction Rate ◽  
Ion Concentration ◽  
Separation Coefficient ◽  
Comparison Study ◽  
Microchannel Reactor ◽  
Nickel Ion ◽  
Extraction And Separation ◽  
Initial Ph

Abstract A comparison study about the extraction and separation of Cu2+ and Ni2+ with Lix984N in a microchannel reactor and separating funnel has been conducted. The results showed that, in the microchannel reactor, the overall volumetric mass transfer coefficient of copper was 20 times that of nickel, whereas in the separating funnel, it was only 2 times that of nickel. In addition, the separation coefficient of copper and nickel in the microchannel reactor was 5 times that of the conventional one. Typically, at initial pH=2.5, contact time 1.95 s, volume fraction of extractant Lix984N 15% and within 1.9 g l−1 nickel ion concentration, the extraction rate of copper was higher than 95%, but the nickel was hardly extracted. In comparison, it needed almost 50 s to reach a Cu extraction of 95% in the separation funnel, with more than 5% Ni co-extraction rate. Although the microfluid extraction showed excellent extraction performance, there exists a need to further improve its processing capacity to apply it to industrial production. Furthermore, scaling up the microreactor has become increasingly promising under the fast developing 3D printing technology.

scholarly journals The Manufacture of Synthetic Rutile by Solvent Extraction of Tri-Alkyl Phosphine Oxide from HCl Leaching Solution of Soda-Roasted Ilmenite Ore

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 588
Author(s):  
Sung-Ho Joo ◽  
Dong Ju Shin ◽  
Dongseok Lee ◽  
Jungshin Kang ◽  
Min-seuk Kim ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Organic Phase ◽  
Phosphine Oxide ◽  
Inductively Coupled Plasma ◽  
Spherical Shape ◽  
Feed Solution ◽  
Synthetic Rutile ◽  
Inductively Coupled ◽  
Leaching Solution ◽  
Series Of Experiments

To manufacture TiO2, a high-purity synthetic rutile, the recovery of Ti was investigated using a hydro-metallurgical process. Using a feed solution containing 32050 mg/L Ti, 110 mg/L Si, 88 mg/L Nb, 2614 mg/L Fe, and 130 mg/L Zr, solvent-extraction experiments were conducted with alkyl phosphine oxide in conjunction with diluents such as kerosene and xylene. The results showed that the extraction mechanism of both diluents was very similar to slope analysis, which had a value of 1.9; however, the extraction equilibrium constant value of organic–metallic species in xylene as a diluent was lower than in kerosene as a diluent. This result affected the stripping efficiency of Ti in particular; therefore, xylene was selected as a diluent. To recover Ti ion from a leaching solution, a series of experiments was conducted, such as the McCabe–Thiele method and countercurrent simulation test for extraction and stripping of Ti. As a result, Ti and impurities such as Fe and Zr were extracted to 99.9% from Si and Nb under optimal conditions using countercurrent four-stage extraction, with 1 M Cyanex 923 at a ratio of organic phase/ aqueous phase=3. In the stripping test, Ti was selectively stripped to 90.1% from Fe and Zr in the organic phase by 1 M HCl. The obtained powder, which was hydrolyzed from an impurity-free solution, was analyzed to a purity of 99.9% by inductively coupled plasma. The TiO2, which has a spherical shape and a diameter of approximately 2 µm according to SEM, was evident by XRD.

scholarly journals Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant

2010 ◽  
Vol 75 (11) ◽  
pp. 1549-1557 ◽  
Author(s):  
Snehal Ghag ◽  
Suresh Pawar
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Organic Phase ◽  
Phosphine Oxide ◽  
Hydrobromic Acid ◽  
Analysis Method ◽  
Acid Media ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

A systematic study of the solvent extraction of uranium(VI) and thorium(IV) from hydrobromic acid media was performed using the neutral phosphine oxide extractant Cyanex-923 in toluene. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the acidity range 5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The effect of the equilibrium period, diluents, diverse ions and stripping agent on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the extracted species of these metal ions was determined based on the slope analysis method. The extraction reactions proceed by solvation and their probable extracted species found in the organic phase were UO2Br2?2Cyanex-923 and ThBr4?2Cyanex-923. Based on these results, a sequential procedure for their separation from each other was developed.

scholarly journals Extraction and separation studies of zinc(II) and copper(II) with D2EHPA and PC-88A from perchlorate media

2002 ◽  
Vol 67 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Rajeev Singh ◽  
Purshottam Dhadke
Keyword(s):  
Phosphoric Acid ◽  
Organic Phase ◽  
Real Samples ◽  
Extraction And Separation ◽  
Ph Range

The extraction behaviors of Zn(II) and Cu(II) from perchlorate media have been investigated using bis-2-ethylhexyl phosphoric acid (D2EHPA) and 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester, (PC-88A) in toluene. The extraction of Zn(II) was found to be quantitative in the pH range 2.5 to 3.0 and 3.0 to 4.0 using 1.0 x 10-1 moldm-3 D2EHPAand 1.0x10-2 mol dm-3 PC-88Ain toluene, respectively, while Cu(II) was extracted quantitatively in the pH range 6.0 to 8.0 and 5.5 to 7.0 with 1.0x10-2 mol dm-3 and 1.0 x 10-3 mol dm-3 D2EHPA and PC-88A in toluene, respectively. Zn(II) was stripped with 4.0 moldm-3 HCl, while Cu(II) with 2.0 moldm-3H2SO4 and 3.0 moldm-3 HNO3 from the organic phase containing D2EHPAand PC-88A respectively. The probable extracted species were ascertained by log D vs. log [HR] plot to be ZnR2.2HR and CuR2.2HR for both the reagents. These methods were used for the determination of Zn(II) and Cu(II) in real samples. The separation of Zn(II) and Cu(II) were carried out from each other and with associated metals.

scholarly journals Extraction and separation studies of Ga(III), In(III) and Tl(III) using the neutral organophosphorous extractant, Cyanex-923

2003 ◽  
Vol 68 (7) ◽  
pp. 581-591 ◽  
Author(s):  
S.D. Pawar ◽  
P.M. Dhadke
Keyword(s):  
Metal Ions ◽  
Organic Phase ◽  
Acidic Solution ◽  
Sequential Procedure ◽  
Analysis Method ◽  
Effect Of Ph ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923 ◽  
Ph Range

The neutral extractant, Cyanes-923 has been used for the extraction and separation of gallium(III), indium(III) and thallium(III) from acidic solution. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the pH range 4.5?5.5, 5.0?6.5 and 1.5?3.0 respectively, and from the organic phase they can be stripped with 2.0 mol dm-3 HNO3, 3.0 mol dm-3 HNO3 and 3.0 mol dm-3 HCl, respectively. The effect of pH equilibration period, diluents, diverse ions and stripping agents on the extraction of Ga(III), In(III) and Tl(III) has been studied. The stroichiometry of the extracted species of these metal ions was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were [MCl3. 3Cyanex-923]?[where M = Ga(III) or In(III)]?and [HTlCl4. 3Cyanex-923]. Based on these results a sequential procedure for the separation of Ga(III), In(III) and Tl(III) from each other was developed.

scholarly journals Recycling REEs from the Waste Products of Silius Mine (SE Sardinia, Italy): A Preliminary Study

2021 ◽  
Vol 13 (24) ◽  
pp. 14000
Author(s):  
Giuseppina Balassone ◽  
Carla Manfredi ◽  
Ermanno Vasca ◽  
Mariacristina Bianco ◽  
Maria Boni ◽  
...  
Keyword(s):  
Sustainable Development Goals ◽  
Scale Up ◽  
Waste Materials ◽  
Processing Plant ◽  
Alkaline Leaching ◽  
Waste Products ◽  
Leaching Solution ◽  
Development Goals ◽  
Preliminary Study ◽  
G Ratio

The present research represents an approach toward the recycling of extractive waste inspired by circular economy and sustainability that is developed in accordance with Goal 12 of the United Nations 2030 Agenda for Sustainable Development Goals. A new procedure for the recovery of REEs from fluorite–barite–galena ores with calcite gangue from the Silius mine (Sardinia, Italy) is presented. The considered samples are waste materials of Silius mineralization, collected in the old processing plant of Assemini (near Cagliari). In this orebody, REE minerals consist of prevailing synchysite (a REE-bearing fluorocarbonate) and subordinate xenotime-Y (a Y-bearing phosphate). REE fluorocarbonates are extracted using 50% K2CO3 as the leaching solution, at 100 °C. Using a solution (mL)/sample (g) ratio of 25, about 10% of the total REE content of the considered sample is extracted within 1 h. At the laboratory scale, such alkaline leaching of REE from the waste materials allows the recovery of the CO2 produced as K2CO3 from concentrated KOH, in accordance with a circular flow. Further work is ongoing to scale up the process into a pilot plant, to prove that the method developed within this research can be economically feasible, socially suitable, and environmentally respectful.

Sign in / Sign up

Export Citation Format

Share Document