Effect of Microbial Biopolymers on Mechanical Properties of Bauxite Residue

Bonal, Niteesh Singh; Prasad, Arun; Verma, Abhay Kumar

doi:10.1007/s12205-021-1297-x

Cited by 13 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18 However, it is important to realize that the methods of measurement of pH in a variety of biochemical, medicinal and industrial applications have evolved significantly nowadays. [20][21][22][23][24] For example, new methods have been developed for the measurement of pH in μL volumes which is of immense importance for biochemical, medicinal and industrial applications. Recently, Xia et al 22 have shown the use of electrodeposited iridium oxide and cobalt hydroxide with gold electrode as the working, counter and reference electrode, respectively to measure pH up to 10-12 μL with acceptable sensitivity.…”

Section: Ph Measurement Toward the Extremes Of The Rangementioning

confidence: 99%

A Discussion on the Nonexistence of Negative pH and pH > 14

Paul

2024

Fine Chemical Engineering

View full text Add to dashboard Cite

The main objective of this article is focused on a discussion on the range of pH which is defined to be 0 ≤ pH ≤ 14. However, ambiguities surrounding the range of pH still persist in the literature, so to say, the existence of pH beyond the aforesaid range (that is, negative pH values and pH values exceeding 14) has often been reported. Herein, we like to underscore the facts that the possibility of having a solution of pH < 0 or pH > 14 essentially accompanies the violation of fundamental thermodynamic consequences, which in turn warrants the care that must be exercised regarding the conclusion of range of pH in a solution under study, as well as the nature of the solution which the concept of pH is being applied to. In a genuine sense of the term, the pH scale should be applied to report the acidity or basicity of a dilute aqueous solution along with an appropriate mention of the experimental temperature. For very highly acidic or basic solutions one should resort to an appropriate scale of acidity or basicity.

show abstract

Section: Ph Measurement Toward the Extremes Of The Rangementioning

confidence: 99%

A Discussion on the Nonexistence of Negative pH and pH > 14

Paul

2024

Fine Chemical Engineering

View full text Add to dashboard Cite

show abstract

“…Aluminum, the second largest metal after steel, plays an important role in the national economic development (Power et al, 2011). The demand for aluminum around the world has been growing quickly as a result of rapid industrialization and urbanization process during the past decades (Bonal et al, 2021). Bauxite ore is the main source for the production of alumina from which the metallic aluminum is extracted (Evans, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of pH value on effectiveness of biopolymer-based treatment of bauxite mine slurry

Meng¹,

Li²,

Yan³

et al. 2023

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

Effective dehydration and flocculation of mine slurries or sludge is important for nonferrous metal industries and environmental engineering. However, the mechanisms for the flocculation of slurry remain largely unclear. This paper presents the results of a series of flocculation tests, which was conducted on the slurry suspensions treated by xanthan gum (flocculant) at different pH values. It is shown that the settlement rate of mine slurry particles can be accelerated by adding xanthan gum, and the maximum sedimentation rate was obtained at a pH value of 5.9, and the final volume of flocs is significantly increased due to the addition of the flocculant. In addition, the settlement rates of xanthan gum-treated slurry suspensions at the pH values of 3, 5 and 7 decrease slightly compared with the reference slurry suspensions with pH=5.9, and the slurries remained stable as suspensions at the pH value of 9 and 11. The zeta potential measurement and SEM image analysis show that flocculation occurs primarily due to electrostatic attraction between slurry particles and the flocculants, and the bridging effect between the carboxylic groups in the side chains of xanthan gum molecule and the suspension particles.

show abstract