scholarly journals Dispersion Behavior of Blast Furnace Sludge for Valuable Metal Recovery

2021 ◽  
Vol 59 (5) ◽  
pp. 295-303
Author(s):  
Jae-Heon Jung ◽  
So-Yeong Lee ◽  
Joo Choi ◽  
Ho-Sang Sohn
Keyword(s):  
Blast Furnace ◽  
Zeta Potential ◽  
Sodium Hexametaphosphate ◽  
Hydrodynamic Size ◽  
Ultrasonic Dispersion ◽  
Valuable Metal ◽  
Absolute Value ◽  
Blast Furnace Sludge ◽  
The Absolute ◽  
Solid Liquid

Blast furnace sludge, which comes from the iron making process, contains many valuable materials including iron, carbon, and zinc, etc. Because a cohesive agent is added during filtration, fine sludge particles are agglomerated together. Therefore, This makes it necessary to disperse the sludge in solution before separating or recovering valuable materials. In this study, the effects of solid/liquid (g/L) ratio, ultrasonic dispersion conditions, the pH of solvent, and the concentration of dispersant on the dispersion of sludge were investigated by measuring the interfacial properties (zeta potential and hydrodynamic size) of sludge particles. High absolute value of zeta potential and small hydrodynamic size suggests that the sludge particles in the solution presents good dispersion. The absolute value of zeta potential increased gradually at high solid/liquid ratio and ultrasonic dispersion intensity. But when the sludge in solution was dispersed for more than 30 minutes, the absolute value of the zeta potential decreased due to increasing contact and interaction between the particles. Optimal dispersion operations were conducted and when the pH of the solution was adjusted to 11, the zeta potential value was measured to be -44.8 mV. This means that the sludge formed the most stable dispersed phase. The lowest zeta potential was measured to be -46.4 mV with the addition of sodium hexametaphosphate (NaPO3)6 in the solution. It is thought that the sodium hexametaphosphate reduced ionic strength by removing alkali metal ions from the solution of sludge.

Investigation on Dispersive Behavior of TiO2-H2O Nanofluids

2013 ◽  
Vol 468 ◽  
pp. 49-52
Author(s):  
Xian Ju Wang ◽  
Xin Fang Li ◽  
Zhen Zhang Li ◽  
Fang Lin
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Zeta Potential ◽  
Mass Fraction ◽  
Sodium Dodecyl ◽  
Absolute Value ◽  
Dodecyl Sulfate ◽  
The Absolute ◽  
The Stability ◽  
Electrostatic Repulsions

This paper investigated the effects of different pH and dispersant concentration on the dispersion of TiO2 H2O by the measuring zeta potential and absorbency. The results show that the absolute value of zeta potential and the absorbency are higher at pH8-10. Sodium dodecyl sulfate (SDS) can significantly increase the absolute value of zeta potential of particle surfaces by electrostatic repulsions, which leads to the enhancement of the stability for TiO2 nanosuspensions. 0.1%(Mass fraction) TiO2 nanosuspensions has the best dispersion at the SDS optimizing concentration 0.045 %. The results also show the zeta potential has good corresponding relation with absorbency, and the higher absolute value of zeta potential and the absorbency are, the better dispersion and stability in system is.

Effect of Aminosulphonate Based Superplasticizer on the Properties of Slag Pastes

2013 ◽  
Vol 864-867 ◽  
pp. 755-758
Author(s):  
Qun Pan ◽  
Cong Li Shi ◽  
Bin Zhu
Keyword(s):  
Zeta Potential ◽  
Rheological Properties ◽  
Absolute Value ◽  
As Adsorption ◽  
The Absolute ◽  
Over Time

This study indicates how aminosulphonate (AS) based superplasticizer affects the properties of slag pastes activated by NaOH, such as adsorption, zeta potential and mini slump. It was concluded that the adsorption of superplasticizer on slag pastes depended directly on the dosage of the superplasticizer and the retarder. Slag particles grounded with the retarder YP-3 adsorbed 1.53 times of superplasticizer AS as much as pure slag particles at 1.5% mass of the slag, and the absolute value increment of the zeta potential of the slag paste suspension containing the retarder YP-3 is 15.20mV, compared with 9.81mV in the system without YP-3. Besides, the Slag pastes activated by NaOH containing the retarder YP-3 show better rheological properties and lower fluidity loss over time.

Changing the Interface Cementitious Materials/Aqueous Solution For Performing Electroosmosis

1987 ◽  
Vol 114 ◽  
Author(s):  
A. J. Kuin ◽  
H. N. Stein
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Cementitious Materials ◽  
Absolute Value ◽  
Excess Water ◽  
The Absolute

ABSTRACTRemoval of excess water from cement/sand/water mixes can be effected by electroosmosis with an efficiency of several hundred g per Watt sec, if an additive is applied which increases the absolute value of the zeta potential.

Influence of SDBS on Stability of Copper Nano-Suspensions

2007 ◽  
Author(s):  
Xinfang Li ◽  
Dongsheng Zhu ◽  
Gang Chen ◽  
Xianju Wang
Keyword(s):  
Heat Transfer ◽  
Zeta Potential ◽  
Cu Nanoparticles ◽  
Transfer Enhancement ◽  
Sodium Dodecylbenzenesulfonate ◽  
Absolute Value ◽  
Ph Values ◽  
The Absolute ◽  
The Stability ◽  
Electrostatic Repulsions

Dispersion and stability of Cu nano-suspensions with dispersant is the important base for the study of rheology and heat transfer enhancement of the suspensions. This paper presented a procedure for preparing a nanofluid which was a suspension consisting of nanophase powders and a base liquids. By means of the procedure, Cu-H2O nanofluids with and without dispersant were prepared, whose sedimentation photographs were given to illustrate the stability and evenness of suspension with dispersant. Dispersion and stability of Cu nanoparticles in water were studied under different pH values and the concentration of sodium dodecylbenzenesulfonate (SDBS) dispersant by the method of zeta potential, absorbency and sedimentation photographs. The results show that zeta potential has very corresponding relation with absorbency, and the higher absolute value of zeta potential and absorbency are, the better dispersion and stability in system is. The absolute value of zeta potential and absorbency are higher at pH 9.5. SDBS can significantly increase the absolute value of the zeta potential of the particle surfaces by electrostatic repulsions, which leads to the enhancement of the stability of the Cu suspensions. The optimizing concentration for SDBS in the 0.1% copper nano-suspensions is 0.07%, which has the best disperse results.

Surface Modification of Nano-Copper and its Dispersive Behavior in Water

2008 ◽  
Vol 373-374 ◽  
pp. 670-673
Author(s):  
X.J. Wang ◽  
Dong Sheng Zhu ◽  
X.F. Li ◽  
Nan Wang
Keyword(s):  
Particle Size ◽  
Surface Modification ◽  
Zeta Potential ◽  
Cu Nanoparticles ◽  
Sodium Dodecylbenzenesulfonate ◽  
Absolute Value ◽  
Ph Values ◽  
The Absolute ◽  
The Stability ◽  
Electrostatic Repulsions

In this paper, by measurement of zeta potential and particle size the surface modification of Cu nanoparticles in water was investigated at different pH values and different concentration of sodium dodecylbenzenesulfonate (SDBS) dispersant. The results show that the absolute value of zeta potential has very corresponding relation with particle size, and that the higher the absolute value of zeta potential and the smaller of the particle size are, the better dispersion and stability of copper nano-suspensions system is. It is also found that SDBS can significantly affect the value of zeta potential and particle size by electrostatic repulsions, which lead to the enhancement of the stability of the Cu suspensions, and the optimizing concentration for SDBS in 0.1% copper nano-suspensions is 0.07%, which have the best disperse results.

Effect of Modified Sludge on the Particles Flocculation and Slurry Stability in the Co-slurry of Sludge and Petroleum Coke

2017 ◽  
Vol 15 (3) ◽  
Author(s):  
Meng Liu ◽  
Xiaobin Zhang ◽  
Liang Zhao
Keyword(s):  
Energy Consumption ◽  
Zeta Potential ◽  
Petroleum Coke ◽  
Reflectance Measurement ◽  
Absolute Value ◽  
Calculation Results ◽  
The Absolute ◽  
The Stability ◽  
Shearing Energy ◽  
Slurry Stability

Abstract Sewage sludge modified by Ca(OH)2 and Fe2(SO4)3 were used as make the slurry with petroleum coke, and changes in the size distribution and a total number of particles in the slurry were determined by Focused Beam Reflectance Measurement (FBRM) to explore the particles flocculation mechanism. In addition, the structural strength of petroleum coke sludge slurry (PCSS) was calculated by two mathematic models to illustrate the how the sludge improves the stability of PCSS. The results indicated that the absolute value of the Zeta potential of PCSS increased with the sludge addition and that PCSS stability improved. However, the absolute value of the Zeta potential decreased and the stability declined after the sludge was modified by Fe2(SO4)3 and Ca(OH)2. Petroleum coke particles were wrapped by sludge flocs, and small particles flocculated during their co-slurry process to form a spatial network structure, effectively prevented the settlement of petroleum coke particles and ultimately improved the stability of slurry. The calculation results obtained by the two mathematic models reveal that the shearing energy consumption per-unit-quality of PCSS using raw sludge is twice or thrice than that of PCWS. However, energy consumption was reduced after the sludge was modified by Fe2(SO4)3.

Photoluminescence Properties and Zeta Potential of Water-Dispersible CdTe Nanocrystals

2003 ◽  
Vol 789 ◽  
Author(s):  
Masanori Ando ◽  
Chunliang Li ◽  
Norio Murase
Keyword(s):  
Zeta Potential ◽  
Sol Gel ◽  
Carboxyl Group ◽  
Amino Group ◽  
Absolute Value ◽  
Water Dispersible ◽  
Cdte Nanocrystals ◽  
Pl Intensity ◽  
The Absolute ◽  
Charged Form

ABSTRACTThe photoluminescent (PL) properties and zeta potential of green-emitting CdTe nanocrystals (diameter: 3 nm) capped with a stabilizing surfactant, thioglycolic acid (TGA), have been investigated as a function of pH of the aqueous solution. The green PL intensity reached the maximum at pH5.1 and was somewhat lower in the pH range of 6–10, which was similar to the previously reported result. However, when the pH was at and below 4, the green PL intensity decreased drastically. The relative ratio of the dissociation form of the carboxyl group of TGA showed a large diminution at and below pH5 accompanied by a significant decrease of the absolute value of zeta potential. Since the absolute value of zeta potential reflects the stability of nanocrystals, the results obtained shows that the TGA-capped CdTe nanocrystals are stable only in basic to neutral regions and that the agglomeration of the nanocrystals in acidic range reflects the transition from the dissociated (charged) form to the non-dissociated (non-charged) form of a carboxyl group in TGA. Encapsulation of nanocrystals in glass is a promising way to further improve the long-term photostability of nanocrystals. Therefore, we chose an alkoxide having an amino group for a matrix for the encapsulation. The amino group has a good affinity to TGA as well as promotes the sol-gel reaction. As the result, the CdTe nanocrystals have been dispersed finely in the glass matrix without a deterioration of PL intensity.

scholarly journals Incentive Function of Audit Opinion for the Increase of Regional Operational Expenditure and Own-Source Revenues Through Sensitivity Analysis in Indonesia

2020 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Muhammad Ikbal Abdullah ◽  
Andi Chairil Furqan ◽  
Nina Yusnita Yamin ◽  
Fahri Eka Oktora
Keyword(s):  
Sensitivity Analysis ◽  
Significant Influence ◽  
Provincial Government ◽  
Sensitivity Testing ◽  
Audit Opinion ◽  
Absolute Value ◽  
Operating Expenditure ◽  
The Absolute ◽  
Operational Expenditure

This study aims to analyze the sensitivity testing using measurements of realization of regional own-source revenues and operating expenditure and to analyze the extent of the effect of sample differences between Java and non-Java provinces by using samples outside of Java. By using sensitivity analysis, the results found the influence of audit opinion on the performance of the provincial government mediated by the realization of regional operating expenditure. More specifically, when using the measurement of the absolute value of the realization of regional operating expenditure it was found that there was a direct positive and significant influence of audit opinion on the performance of the Provincial Government. However, no significant effect of audit opinion was found on the realization value of regional operating expenditure and the effect of the realization value of regional operating expenditure on the performance of the Provincial Government. This result implies that an increase in audit opinion will be more likely to be used as an incentive for the Provincial Government to increase the realization of regional operating expenditure.

Die Bedeutung der Homogenisationsart und -intensität für die Größe und Konstanz der Sauerstoffaufnahme von Meerschweinchen-Leberhomogenat / The Influence of Mode and Intensity of Homogenization on the Absolute Value and Stability of Oxygen Consumption of Guinea Pig Liver Homogenates

1977 ◽  
Vol 32 (11-12) ◽  
pp. 908-912 ◽  
Author(s):  
H. J. Schmidt ◽  
U. Schaum ◽  
J. P. Pichotka
Keyword(s):  
Oxygen Uptake ◽  
Guinea Pig ◽  
Measuring Time ◽  
Pig Liver ◽  
Absolute Value ◽  
Modified Method ◽  
Simultaneous Measurements ◽  
Liver Homogenates ◽  
The Absolute ◽  
Guinea Pig Liver

Abstract The influence of five different methods of homogenisation (1. The method according to Potter and Elvehjem, 2. A modification of this method called Potter S, 3. The method of Dounce, 4. Homogenisation by hypersonic waves and 5. Coarce-grained homogenisation with the “Mikro-fleischwolf”) on the absolute value and stability of oxygen uptake of guinea pig liver homogenates has been investigated in simultaneous measurements. All homogenates showed a characteristic fall of oxygen uptake during measuring time (3 hours). The modified method according to Potter and Elvehjem called Potter S showed reproducible results without any influence by homogenisation intensity.

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