scholarly journals The Effect of Sodium Alginate on Chlorite and Serpentine in Chalcopyrite Flotation

Minerals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 196 ◽  
Author(s):  
Guangjiu Pan ◽  
Guofan Zhang ◽  
Qing Shi ◽  
Wei Chen
Keyword(s):  
Zeta Potential ◽  
Sodium Alginate ◽  
Ternary Mixture ◽  
Selective Adsorption ◽  
Mineral Surface ◽  
Adsorption Model ◽  
No Adsorption ◽  
Sulfide Flotation ◽  
Adsorption Density ◽  
Density Results

Chlorite and serpentine are common magnesium-containing gangue minerals in copper sulfide flotation. In this study, sodium alginate, a natural hydrophilic polysaccharide, was introduced as a selective depressant for these gangue minerals. Micro-flotation tests were conducted on both single minerals and synthetic mixtures. The flotation results showed that sodium alginate could simultaneously depress the flotation of chlorite and serpentine effectively, but seldom influenced the floatability of chalcopyrite at pH 9. In the ternary mixture flotation, a concentrate with a Cu grade of 31% could be achieved at Cu recovery of 90%. The selective depression of chlorite and serpentine was also validated by the real ore flotation experiments. The selective depression mechanism was investigated through adsorption tests, zeta potential measurements, and FTIR analyses. The adsorption density results implied that sodium alginate selectively adsorbed on the surface of phyllosilicates, but no adsorption on the chalcopyrite surface was observed. The zeta potential results showed that the sodium alginate could selectively decrease the surface charge of chlorite and serpentine. The FTIR results revealed the chemical adsorption of sodium alginate on the chlorite and serpentine surface and no form of adsorption on chalcopyrite, agreeing well with the adsorption density results. On the basis of these results, a selective adsorption model of sodium alginate on the mineral surface was proposed.

scholarly journals FORMULATION AND CHARACTERIZATION OF TIMOLOL MALEATE-LOADED NANOPARTICLES GEL BY IONIC GELATION METHOD USING CHITOSAN AND SODIUM ALGINATE

2019 ◽  
pp. 48-54 ◽  
Author(s):  
RISA AHDYANI ◽  
LARAS NOVITASARI ◽  
RONNY MARTIEN
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Sodium Alginate ◽  
Release Kinetics ◽  
In Vitro Release ◽  
Entrapment Efficiency ◽  
Polydispersity Index ◽  
Ionic Gelation ◽  
Timolol Maleate ◽  
Optimum Formula

Objective: The objectives of this study were to formulate and characterize nanoparticles gel of timolol maleate (TM) by ionic gelation method using chitosan (CS) and sodium alginate (SA). Methods: Optimization was carried out by factorial design using Design Expert®10.0.1 software to obtain the concentration of CS, SA, and calcium chloride (CaCl2) to produce the optimum formula of TM nanoparticles. The optimum formula was characterized for particle size, polydispersity index, entrapment efficiency, Zeta potential, and molecular structure. Hydroxy Propyl Methyl Cellulose (HPMC) K15 was incorporated into optimum formula to form nanoparticles gel of TM and carried out in vivo release study using the Franz Diffusion Cell. Results: TM nanoparticles was successfully prepared with concentration of CS, SA, and CaCl2 of 0.01 % (w/v), 0.1 % (w/v), and 0.25 % (w/v), respectively. The particle size, polydispersity index, entrapment efficiency, and Zeta potential were found to be 200.47±4.20 nm, 0.27±0.0154, 35.23±4.55 %, and-5.68±1.80 mV, respectively. The result of FTIR spectra indicated TM-loaded in the nanoparticles system. In vitro release profile of TM-loaded nanoparticles gel showed controlled release and the Korsmeyer-Peppas model was found to be the best fit for drug release kinetics. Conclusion: TM-loaded CS/SA nanoparticles gel was successfully prepared and could be considered as a promising candidate for controlled TM delivery of infantile hemangioma treatment.

Cr(III) ionic imprinted polyvinyl alcohol/sodium alginate (PVA/SA) porous composite membranes for selective adsorption of Cr(III) ions

2010 ◽  
Vol 165 (2) ◽  
pp. 465-473 ◽  
Author(s):  
Jian Hua Chen ◽  
Guo Ping Li ◽  
Qing Lin Liu ◽  
Jian Cong Ni ◽  
Wen Bing Wu ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Selective Adsorption ◽  
Composite Membranes ◽  
Porous Composite

scholarly journals Effect of dextrin on flotation separation and surface properties of chalcopyrite and arsenopyrite

2020 ◽  
Author(s):  
Jingshen Dong ◽  
Quanjun Liu ◽  
S. H. Subhonqulov
Keyword(s):  
Contact Angle ◽  
Zeta Potential ◽  
Significant Interaction ◽  
Selective Adsorption ◽  
Surface Adsorption ◽  
Inhibitory Effect ◽  
Chain Structure ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Chemical Adsorption

Abstract The flotation separation and mechanism of dextrin on chalcopyrite and arsenopyrite surface were investigated using micro-flotation tests, zeta potential measurements, infrared spectroscopy, contact angle measurement and surface adsorption experiments. The micro-flotation test showed that dextrin had obvious inhibitory effect on arsenopyrite flotation, but had no inhibitory effect on chalcopyrite flotation. After treating the surface of arsenopyrite with dextrin, the infrared spectra showed that new characteristic peaks, indicating that chemical adsorption and significant interaction between dextrin and arsenopyrite particles. Zeta potential measurements, contact angle measurement and surface adsorption experiments showed that the selective adsorption of dextrin added a large number of hydrophilic groups to the surface of arsenopyrite, but had little effect on chalcopyrite. In addition, the macromolecular chain structure of dextrin may hinder the attachment of collector molecules to arsenopyrite. The combined effect of these two aspects makes the arsenopyrite treated with dextrin lose its hydrophobicity and enables the separation of chalcopyrite and arsenopyrite.

scholarly journals The Effect of the Ionic Strength of Process Water on the Interaction of Talc and CMC: Implications of Recirculated Water on Floatable Gangue Depression

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 231 ◽  
Author(s):  
Malibongwe Manono ◽  
Kirsten Corin ◽  
Jenny Wiese
Keyword(s):  
Ionic Strength ◽  
Zeta Potential ◽  
Saline Water ◽  
Process Water ◽  
Gangue Mineral ◽  
Mineral Surface ◽  
Base Interaction ◽  
Long Run ◽  
Complex Process ◽  
Closed Water

Previous studies speculate that hydroxo species present in flotation pulps at pH > 9, particularly those of polyvalent cations, selectively adsorb onto gangue minerals. Such species supposedly enhance the depressive action of carboxymethyl cellulose (CMC) onto gangue via an acid-base interaction between the positively charged mineral surface and the negatively charged CMC molecule. Thus, the hydrophilicity of gangue minerals is enhanced, preventing the dilution of the concentrate. However, as there is little evidence to support these claims for complex process waters of increasing ionic strength, it is important to investigate. Adsorption data and mineral surface charge analyses provide a fundamental understanding of how electrolytes and their ionic strengths affect gangue mineral-depressant adsorption. It is strongly anticipated that decoupling these effects will allow process operators to tailor their process water quality needs towards best flotation operating regimes and, in the long run, effect closed water circuits. Thus, using talc as a proxy for naturally floatable gangue common in sulfidic Cu–Ni–PGM ores, this work investigates the influence of the ionic strength of process water on the adsorption of CMC onto talc for a perspective on how saline water in sulfidic ores would affect the behavior and therefore management of floatable gangue. In the presence of CMC, the microflotation results showed that the rate of talc recovery decreased with increasing ionic strength of process water. Increases in ionic strength resulted in an increase in the adsorption of CMC onto talc. Talc particles proved to have been more coagulated at higher ionic strength since the settling time decreased with increasing ionic strength. Furthermore, the zeta potential of talc particles became less negative at higher ionic strengths of process water. It is thus proposed that increases in the ionic strength of process water increased the zeta potential of talc particles, enhancing the adsorption of CMC onto talc. This in turn created a more coagulated nature on talc particles, increasing their hydrophilicity and thereby retarding floatability.

Floating Separation between Collophanite and Dolomite Affected by Inorganic Interaction

2014 ◽  
Vol 881-883 ◽  
pp. 1665-1669
Author(s):  
Xiao Tai He ◽  
Qin Zhang ◽  
Shu Hao Qin
Keyword(s):  
Aqueous Solution ◽  
Surface Properties ◽  
Theoretical Basis ◽  
Selective Adsorption ◽  
Electric Properties ◽  
Mineral Surface ◽  
Negative Effects ◽  
Adsorption Characteristics ◽  
Research Findings ◽  
Dissolved Components

According to the type of Guizhou marine sedimentary phosphorus ore, the main reason of refractory is the similar surface properties of collophane and dolomite.In addition,the interaction of dissolved components of mineral and external ion leads the new eguilibrium system in aqueous solution,which further affects the selective adsorption of the agent in mineral surface.Selecting collophanite-dolomite system as the research object, this article studies the effect of the interaction of some inorganic anions on the floatability difference of the two minerals in the flotation system. The effect of the interaction on the electric properties of the mineral surface and adsorption characteristics were also examined with the purpose to find out the interaction mechanism.It hopes to provide theoretical basis for practical mineral selection. The research findings shows that in the range of pH 3 to 5, the interaction of PO43- and SO42- has a better effect of the separation between collophanite and dolomite.The interactions of SiO32- and CO32- makes the floatability difference of collophanite and dolomite closer when the pH is greater than 9.25, and simultaneously shows some negative effects on the flotation separation of the two minerals.

scholarly journals Preparation and Evaluation of Sodium Alginate Microparticles using Pepsin

2020 ◽  
Vol 10 (2) ◽  
pp. 5-11
Author(s):  
Sankha Bhattacharya ◽  
Vishal Puri ◽  
Shubham Sharma ◽  
Debasish Sahoo ◽  
Pradeep Kumar Pal ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Particle Size ◽  
Zeta Potential ◽  
Size Distribution ◽  
Sodium Alginate ◽  
Calcium Chloride ◽  
Active Pharmaceutical Ingredient ◽  
Sulforhodamine B ◽  
Normal Particle ◽  
Preparation And Evaluation

Aim: The main aim of this article is to prepare and evaluate sodium alginate microparticles and evaluate on the basis of their characterization. The drug is dissolved, encapsulated or attached to a microparticles matrix. Depending upon method of preparation microparticles were obtained. Microparticles were developed as a carrier for vaccines and other disease like rheumatoid arthritis, cancer etc. Microparticles were developed to increase the efficacy of active pharmaceutical ingredient to a specific targeted site. Material and Method: Microparticles of Sodium Alginate, Pepsin and Calcium Chloride were prepared in six batches (A-F) with different ratio of sodium alginate and calcium chloride respectively i.e. (0.25:2.5), (0.25:5), (0.25:7.5), (0.5:2.5), (0.5:5), (0.5:7.5) by using a homogenizing method. Microparticles were evaluated for particle size distribution, zeta potential and morphology. Result and Discussion:  The normal particle size of each of the six batches were analyzed by Zeta Sizer (Delsa C Particle Analyzer) and it was found that the Batch B (0.25:5) delivered the best microparticles with size distribution of 1.2731 (µm). All batches were seen under Motic magnifying microscope by using the Sulforhodamine B (M.W. 479.02) color as staining dye. Microparticles was found to be semi spherical in shape. Conclusion: Results of all the six batches was contrasted based on particle size investigation, zeta potential and morphology. Batch B (0.25:5) was considered as the best formulation. Key words:  Micro Particle, Pepsin, Sodium Alginate and Calcium Chloride, Sulforhodamine B, Zeta Sizer.

scholarly journals Composite of Kaolin/Sodium Alginate (SA) Beads for Methylene Blue Adsorption

2020 ◽  
Vol 19 (2) ◽  
pp. 100
Author(s):  
Irwin Tan Kai Ge ◽  
Muhammad Wahyu Nugraha ◽  
Norashikin Ahmad Kamal ◽  
Nonni Soraya Sambudi
Keyword(s):  
Methylene Blue ◽  
Sodium Alginate ◽  
Organic Molecules ◽  
Dye Removal ◽  
Clay Material ◽  
Order Kinetic ◽  
Environment Pollution ◽  
Adsorption Model ◽  
Adsorption Processes ◽  
Pseudo Second Order

Dyeing industry is one of the fast-growing industries but at the same time has also brought us a big issue on environment pollution. Adsorption processes is the most effective method in dye removal compared to other methods of wastewater treatment. In recent years, there is an increasing interest in utilizing clay material such as kaolinite as an adsorbent to remove not only inorganic but also organic molecules. In this study, composite of kaolin-sodium alginate (SA) beads was synthesized by varying the weight of kaolin from 0.5 g to 2 g. XRD, FTIR, and surface area analyses were used to characterize the kaolin; while FTIR was used to characterize the composite where the functional groups of kaolin and SA are existing. The amount of 1 g kaolin in SA could improve the adsorption of methylene blue up to 78% of removal after 8 hours. The adsorption model fits pseudo second order kinetic and Langmuir isotherm

scholarly journals Microparticle Deposition on Human Serum Albumin Layers: Unraveling Anomalous Adsorption Mechanism

2020 ◽  
Vol 4 (4) ◽  
pp. 51
Author(s):  
Małgorzata Nattich-Rak ◽  
Maria Dąbkowska ◽  
Zbigniew Adamczyk
Keyword(s):  
Ionic Strength ◽  
Human Serum Albumin ◽  
Zeta Potential ◽  
Serum Albumin ◽  
Human Serum ◽  
Electrostatic Interactions ◽  
Surface Concentration ◽  
Dlvo Theory ◽  
Adsorption Model ◽  
Negative Zeta Potential

Human serum albumin (HSA) layers are adsorbed on mica under controlled diffusion transport at pH 3.5 and various ionic strengths. The surface concentration of HSA is directly determined by AFM imaging of single molecules. It is shown that the adsorption kinetics derived in this way is quantitatively described using the random sequential (RSA) adsorption model. The electrokinetic characteristics of the HSA layers at various pHs comprising their zeta potential are acquired in situ while using the streaming potential method. It is shown that at pH 3.5 the zeta potential of mica becomes positive for HSA concentrations above 3000 μm−2. At larger pHs, HSA layers exhibit negative zeta potential for the entire range of coverage. Thorough characteristics of these monolayers at various pHs were performed applying the colloid deposition method involving negatively charged polystyrene microparticles. The kinetics of their deposition and their maximum coverage are determined as a function of the HSA layer surface concentration, pH, and ionic strength. An anomalous deposition of microparticles on substrates also exhibiting a negative zeta potential is observed, which contradicts the Derjaguin, Landau, Vervey, Overbeek (DLVO) theory. This effect is interpreted in terms of heterogeneous charge distribution that results from molecule concentration fluctuations. It is also shown that the maximum concentration of microparticles abruptly decreases with the electric double-layer thickness that is regulated by changing ionic strength, which indicates that their deposition is governed by electrostatic interactions. One can argue that the results obtained in this work can be exploited as useful reference data for the analysis of deposition phenomena of bioparticles on protein layers.

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