The Determination of Free Acid in Zinc Processing Solutions

Rolia, E; Dutrizac, J. E.

doi:10.1179/cmq.1984.23.2.159

Cited by 22 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although zinc(II) ions were also present in the negative electrolyte and could potentially interfere with the H + titration, it has been shown that this interference is negligible under the highly acidic conditions of the samples and does not change the end-point of titration. 22 To determine the Ce(IV) concentration in the positive electrolyte, 99% pure ammonium iron(II) sulfate hexahydrate (Sigma-Aldrich) was used for titration and ferroin (1,10-phenanthroine iron(II) sulfate, Alfa Aesar) was used as a colorimetric redox indicator. All the chemicals were used as received without any further pretreatment or purification.…”

Section: Methodsmentioning

confidence: 99%

Use of Mixed Methanesulfonic Acid/Sulfuric Acid as Positive Supporting Electrolyte in Zn-Ce Redox Flow Batter

Pritzker

Gostick

2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

The effect of different positive supporting electrolytes on the performance of a bench-scale Zn-Ce redox flow battery (RFB) has been studied. The effectiveness of mixed methanesulfonic/sulfuric acid, mixed methanesulfonic/nitric acid, and pure methanesulfonic acid has been assessed and compared on the basis of the cyclic voltammetric response for the Ce(III)/Ce(IV) redox couple and galvanic charge-discharge of a bench-scale Zn-Ce RFB. The Ce(III)/Ce(IV) reaction exhibits faster kinetics and the RFB exhibits higher coulombic efficiency and long-term performance over ~40 charge-discharge cycles in the mixed 2 mol/L MSA–0.5 mol/L H2SO4 electrolyte compared to that achieved in the commonly used 4 mol/L MSA electrolyte due to lower H+ crossover and higher Ce(IV) solubility. The coulombic efficiency fade rate in the mixed MSA-H2SO4 electrolyte is 0.55% per cycle over 40 charge-discharge cycles, while the fade rate is 1.26% in the case of 4 mol/L MSA. Furthermore, the positive electrode reaction is no longer the limiting half-cell reaction even at the end of long-term battery charge-discharge operation. This work shows that a mixed MSA–H2SO4 acid electrolyte may be a better option for the positive side of a Zn-Ce RFB as a large-scale energy storage device.

show abstract

Section: Methodsmentioning

confidence: 99%

Use of Mixed Methanesulfonic Acid/Sulfuric Acid as Positive Supporting Electrolyte in Zn-Ce Redox Flow Batter

Pritzker

Gostick

2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Final free acid concentration of the solutions was measured by titration with 0.1 molar (M) NaOH. A solution of Magnesium-EthyleneDiamineTetraacetic Acid (Mg-EDTA) (0.2 M MgSO 4 + 0.1 M EDTA) was used to complex metal ions that would normally contribute hydrogen ions by hydrolysis [35].…”

Section: Methodsmentioning

confidence: 99%

Fe(III) Precipitation and Copper Loss from Sulphate-Chloride Solutions at 150 °C: A Statistical Approach

Javed

Asselin

2020

Metals

View full text Add to dashboard Cite

The purification of hydrometallurgical process solutions by Fe(III) precipitation is a common and large-scale industrial operation. This step is notorious for valuable metal loss occurring with the iron precipitation product, which is usually directed to tailings. In this study, factors affecting Fe(III) precipitation and associated copper loss were studied in synthetic process solutions using statistical methods. The variables studied were: Initial acid concentration, retention time, seed addition, and initial Fe(III), Cu(II), and chloride concentrations. The importance of each variable and its interaction effects were studied against two responses, i.e., percent of Fe(III) precipitated as hematite and percent of Cu lost to solids. The results showed that a combination of high acid and moderate seeding was required to simultaneously achieve high proportions of Fe(III) precipitated as hematite and lower copper loss to the precipitates. High acid concentrations create low supersaturation for Fe(III), which minimizes the consequences of homogeneous nucleation and favors particle growth.

show abstract

Comparison of methods of gold and silver extraction from Hellyer pyrite and lead-zinc flotation middlings

Bilston

Bruckard

McCallum

et al. 1990

Sulphide Deposits—their Origin and Processing

View full text Add to dashboard Cite

The Determination of Free Acid in Zinc Processing Solutions

Cited by 22 publications

References 5 publications

Use of Mixed Methanesulfonic Acid/Sulfuric Acid as Positive Supporting Electrolyte in Zn-Ce Redox Flow Batter

Use of Mixed Methanesulfonic Acid/Sulfuric Acid as Positive Supporting Electrolyte in Zn-Ce Redox Flow Batter

Fe(III) Precipitation and Copper Loss from Sulphate-Chloride Solutions at 150 °C: A Statistical Approach

Comparison of methods of gold and silver extraction from Hellyer pyrite and lead-zinc flotation middlings

Contact Info

Product

Resources

About