Study of Processing Techniques for Nepheline Syenitic Raw Material Exploitation

2014 ◽  
Vol 92 ◽  
pp. 215-220
Author(s):  
Carolina del Roveri ◽  
Letícia H. Godoy ◽  
Antenor Zanardo ◽  
Luciano L. Silva ◽  
Maria Margarita T. Moreno ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Separation ◽  
Optical Microscope ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Before And After ◽  
Size Characterization ◽  
Particle Size Characterization ◽  
Processing Techniques

Lavrinhas, a city located 234 km northeast of São Paulo, Brazil, presents syenitic rocks with high content of nepheline, whose preliminary field assessment indicated its potential to be used in the production of ceramic products. The paper aimed to study this raw material with fluxing properties and to determine the best processing methods based on mineralogy and texture, in order to achieve better removal efficiency of the nepheline. Petrographic characterization was carried out in two rock samples, as well as the particle size characterization of the untreated material, the split into fractions for magnetic separation tests and optical microscope observation of the products. In addition, chemical and particle size analysis and melting tests were performed. The latter concerned the material melting color evaluation before and after the magnetic separation, as well as its potential use in glazes and engobes, compared to a standard sample of Nepheline, and inferences for the use in porcelain masses. Preliminary tests showed that after the removal of residual iron oxide, the nepheline raw material bearer has potential to be used in the formulation of porcelain masses, replacing other fluxing materials with higher benefit.

Particle Size Analysis of Fe3O4 Nanoparticles Coated by Polyethyleneglycol

2015 ◽  
Vol 820 ◽  
pp. 373-377 ◽  
Author(s):  
Fernanda A. Sampaio da Silva ◽  
Edwin E.G. Rojas ◽  
Marcos Flávio de Campos
Keyword(s):  
Particle Size ◽  
Average Diameter ◽  
Rietveld Analysis ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Cancer Treatments ◽  
Peg 4000 ◽  
Size Characterization ◽  
Particle Size Characterization

Nanotechnology has been shown as an important tool for developing intelligent devices. In particular, magnetic nanoparticles have been studied due their applications in cancer treatments. However, nanoparticles need to be tightly controlled in relation to size, shape and coating. It makes particles suitable for in vivo applications. In this work, magnetite nanoparticles were used for particle size characterization. Fe3O4 crystals were coated by polyethyleneglycol (PEG 4000). Three different techniques were performed to obtain the nanoparticles average diameter: Rietveld Analysis, Scherrer Equation and Nanosight®. Results indicate good properties.

Particle size characterization as a support for sediment contamination analysis

2017 ◽  
Vol 28 (4) ◽  
pp. 462-476 ◽  
Author(s):  
Felippe Fernandes ◽  
Cristiano Poleto
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Metropolitan Region ◽  
Size Analysis ◽  
Content Type ◽  
Fine Sediments ◽  
Water Courses ◽  
Different Depths ◽  
Particle Size Characterization ◽  
Different Characteristics

Purpose The purpose of this paper is to analyse the results of particle size profiles carried out in the dam Mãe d’água, located in the metropolitan region of Porto Alegre, Rio Grande do Sul, becoming a tool of support for geochemistry evaluation works of sediments in this basin. Design/methodology/approach The methodology comprised the particle size analysis of eight cores sampled using the extraction profile technique “Sampling Cores.” A total of 56 sub-samples were obtained at different depths, varying between 0 and 52 cm. The particle size analysis of the sub-samples was carried out with the protocol relating to Brazilian analysis standards NBR 7,181; for determination of the particle size distribution of thick sediments, the sieve method was used, and for fine sediments, the pipette method was used. Findings The results show that for the different depths, the sediment profiles show similarity in their sedimentary deposition layers. Cores T1, T6, T7 and T8 showed a classification with predominance of mud. Cores T2 and T5 showed variations throughout their sedimentary profile, varying of mud predominance to sand with gravel, and on cores T3 and T4, the predominant characteristic is sand with mud and sand with gravel, respectively. Originality/value It can be seen in this paper that energy of sedimentological flow reaches it in a different way, creating these three sectors (first, sand with gravel; second, sand with mud and third, mud) with different characteristics – morphodynamic and sedimentological. These characteristics are important for the study of the heavy metals on the soil and therefore for reducing the risk of contamination of water courses.

Preparation of Nano-TiO2 in Inverse Micro-Emulsion System with Compound Surfactant

2011 ◽  
Vol 412 ◽  
pp. 25-31
Author(s):  
Wen Yuan Gao ◽  
Xing Xin Jia ◽  
Mei Hong Niu ◽  
Nai Ling Tang ◽  
Zhi Qiang Hu
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Surface Active Agents ◽  
Micro Emulsion ◽  
Emulsion Process ◽  
Surface Active ◽  
Average Size

The nanosized TiO2 is prepared by micro-emulsion process in the system of cyclohexane / [Span80 combined with OP-10] / water with TiCl4 as raw material. The selection method of the surface-active agents was investigated and the influence of amount of surfactant, water / oil ratio and concentration of reactants on the particle size were discussed in this work. The temperature schedule, crystal structure, particle size distribution and appearance of the nanocrystalline TiO2 were analyzed by differential thermal analysis (DTA) combined with X-ray diffraction (XRD), laser particle size analysis (LPSA) and scanning electron microscope (SEM). The results showed that: under these conditions of mixture of 8g Span80 and 2g OP-10 as the emulsifier, water / oil mass ratio of 1/4, TiCl4 concentration of 0.6mol / L and calcinations temperature of 510°C, nanoTiO2 powder with smaller particle size and better dispersion was prepared . And the average size of the product was 27.3nm.

Synthesis and Characterization Investigations of Laboratory-Synthesized VB-VB2-V3B4 Reinforced Al-7wt.% Si Composites via Mechanical Alloying and Pressureless Sintering

2017 ◽  
Vol 263 ◽  
pp. 189-194
Author(s):  
Sıddıka Mertdinç ◽  
Emre Tekoğlu ◽  
Hasan Gökçe ◽  
Duygu Ağaoğulları ◽  
M. Lütfi Öveçoğlu
Keyword(s):  
Particle Size ◽  
Wear Rate ◽  
Mechanical Alloying ◽  
Weight Ratio ◽  
Sintered Sample ◽  
Optical Microscope ◽  
Particle Size Analysis ◽  
Hydraulic Press ◽  
Size Analysis ◽  
Scanning Calorimetry

In this study, the effect of mechanical alloying (MA) on the microstructural, mechanical and physical properties of vanadium boride particulate reinforced Al-7 wt. % Si matrix composites were investigated. VB-VB2-V3B4 containing vanadium boride hybrid powders were mechanochemically synthesized for 5 h from the V2O5-B2O3-Mg powder blends and leached with hydrochloric acid (HCl) for purification. Laboratory-synthesized VB-VB2-V3B4 powders were incorporated into the Al-7wt. % Si matrix powders with the amount of 2 wt.% via MA for 4h in a SpexTM Mixer/Mill using hardened steel vial/balls with a ball-to-powder weight ratio of 7/1. After the MA process, phase analysis (X-ray diffraction), particle size analysis (laser particle size measurement), surface area analysis (Brunauer-Emmett-Teller measurement) and microstructural characterization (scanning electron microscope (SEM) micrograph) and thermal analysis (differential scanning calorimetry (DSC)) of the non-milled/milled Al-7 wt.% Si-2wt.% (VB-VB2-V3B4) powders were conducted. As-blended and MA’d powders were compacted at a uniaxial hydraulic press to obtain cylindrical compacts with a diameter of 12 mm under a pressure of 400 MPa. Green bodies were sintered at 570°C for 2 h under Ar gas flowing conditions. Microstructural characterizations of the sintered samples were carried out using XRD and optical microscope (OM). Physical and mechanical properties of the composites were investigated in terms of density (Archimedes method), Vickers microhardness and wear rate. The microhardness and wear rate of the 4h of MA’d and sintered sample respectively increased to 0.865±0.256 GPa and 0.0036 mm3/N.m as compared with those of as-blended and sintered sample.

scholarly journals Parametric Study of Matisaa Gray Rock as a Potential Clinker Material

2020 ◽  
pp. 22-29
Author(s):  
Mwendwa Geoffrey ◽  
Motochi Isaac ◽  
Otieno Fredrick
Keyword(s):  
Particle Size ◽  
Size Composition ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Particle Sizes ◽  
X Ray ◽  
Saturation Factor ◽  
Clinker Production

This study aimed at evaluating Matisaa gray rock (MGR) for clinker production. MGR is naturally abundant in Matisaa, a rural area in Mwingi West District, Kitui county, Kenya. It is locally used as a gabion filler and other concrete structures with desirable physico-mechanical properties. This research employed a controlled experimental design to determine the clinker qualification of MGR. This was based on particle size analysis and raw meal moduli. The standard sieve tests and a Blaine meter were used in the determination of particle size while the raw meal moduli were determined from the respective cement oxides in MGR, which were determined using wavelength dispersive X-ray fluorescence (WDXRF) spectrometer. It was observed that 69.65% of the particle size composition of MGR was less than 90 . Out of this composition, 71.60% of the particle sizes were less than 45 , contributing to a specific surface area of 292.5 . The hydraulic modulus (2.05 – 2.61) and lime saturation factor (0.87 – 0.98) are quite desirable though the silica and alumina ratios are higher than the standard range due to the low proportions of  and  content. The sulfatisation modulus is also undesirable due to the high content of . Thus, without beneficiation, Matisaa gray rock would lead to the production of low-quality clinker. However, the general parametric comparison of Matisaa gray rock with Konza shows that it has the potential for utilization as a clinker raw material.

Large-Scale Fabrication of Ti3AlC2 Powder with High-Purity

2007 ◽  
Vol 336-338 ◽  
pp. 948-951
Author(s):  
Chang An Wang ◽  
Chun Qing Peng ◽  
Yang Song ◽  
Yong Huang
Keyword(s):  
Particle Size ◽  
High Purity ◽  
Mass Production ◽  
Large Scale ◽  
Raw Materials ◽  
Synthesis Method ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Sem Observation

A synthesis method of high-pure Ti3AlC2 powder with a large scale was presented as pressureless synthesis using TiC, Ti and Al powders as starting materials at 1300~1450°C in flow Ar. The different raw material scales were tested from 2 g to 1.0 kg, and the results showed that the purities of Ti3AlC2 powders could be kept around 97 wt% at different scales of raw materials. SEM observation and particle size analysis revealed that the synthesized Ti3AlC2 powders were uniform and around 5 μm in particle size. This method can be used for mass production of Ti3AlC2 powders with high-purity.

Particle size, water-stable aggregates, and bacterial populations in lake sediments

1971 ◽  
Vol 17 (2) ◽  
pp. 217-227 ◽  
Author(s):  
D. Tsernoglou ◽  
E. H. Anthony
Keyword(s):  
Particle Size ◽  
Bacterial Population ◽  
Particle Surface ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Sediment Particle ◽  
Bacterial Populations ◽  
Water Stable Aggregates ◽  
Before And After ◽  
Direct Counts

Sediments from 10 lakes for which bacterial counts were available were submitted to particle size analysis (Coulter Counter), both before and after removal of organic material. While these sediments were not so highly aggregated as soils, they contained water-stable aggregates and differed from one another in this characteristic. The counter failed to detect some apparently unstable aggregations visible in the sediment of one lake. The median sizes of the untreated sediment were observed to be inversely proportional to the median sizes of the sediment from which the organic component had been removed. There was good correlation between logarithms of the heterotrophic bacterial population (culture counts) and the median sizes of the particles in untreated samples of the sediment. Estimations of bacterial density, assuming a specific gravity of 1.6 for these sediments indicated that, for the four lakes for which direct counts of bacteria were available, there were from 3000 to 15 000 bacteria per square millimeter of sediment particle surface, or about 1 bacterium for every 70 to 300 μ2.

Investigation on Properties of Bentonite Type in Cold Bonded Pelletization of Flue Dust

2011 ◽  
Vol 409 ◽  
pp. 743-748
Author(s):  
Guan Jhou Chen ◽  
Weng Sing Hwang ◽  
Shih Hsien Liu ◽  
Jaw Min Chou
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Electrostatic Precipitator ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Average Particle ◽  
Fixed Amount ◽  
Flue Dust

In the integrated steel mills fabrication processes, the by-product of flue dust and electrostatic precipitator dust were found to be rich with large amounts of iron and carbon content and it could be recycled as a raw material for blast furnaces. In this study, we use the “Cold-bonded Pellet; CBP” technique to prepare the recycling samples for subsequent processing. Therefore, this study investigated under a fixed amount of bentonite added, the choice of different types of bentonite on the powder granulation performance and strength of particle duration effects, bentonite used as a basis for adjustment. The results showed that Bentonite samples of the granulation efficiency increase, relative to its yield and the rate of sticky increase. In general, CBP particle compressive strength increased, duration have increased, and found that curing condition B are large than the A method. In addition, by particle size analysis results show that, bentonite average particle size of 11-12μm have better compressive strength. Comprehensive assessment of granulation and mechanical properties, of which A label in four Bentonite can be preferred.

scholarly journals Real-time particle size analysis using focused beam reflectance measurement as a process analytical technology tool for continuous microencapsulation process

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Muhaimin Muhaimin ◽  
Anis Yohana Chaerunisaa ◽  
Roland Bodmeier
Keyword(s):  
Particle Size ◽  
Real Time ◽  
Optical Microscope ◽  
Particle Size Analysis ◽  
Laser Diffraction ◽  
Size Analysis ◽  
Sieve Analysis ◽  
Reflectance Measurement ◽  
Focused Beam ◽  
Polymer Type

AbstractThe online real-time particle size analysis of the microencapsules manufacturing process using the continuous solvent evaporation method was performed using focused beam reflectance measurement (FBRM). In this paper, we use FBRM measurements to investigate the effects of polymer type and compare the size distributions to those obtained using other sizing methods such as optical microscope and laser diffraction. FBRM was also utilized to measure the length-weighted chord length distribution (CLD) and particle size distribution (PSD) online during particle solidification, which could not be done with laser diffraction or nested sieve analysis. The chord lengths and CLD data were taken at specific times using an online FBRM probe mounted below the microparticle. The timing of the FBRM determinations was coordinated with the selection of microparticle samples for particle size analysis by optical microscope and laser diffraction calculation as a reference. For all three produced batches tested, FBRM, laser diffraction, and sieve analysis yielded similar results. Hardening time for the transformation of emulsion droplets into solid microparticles occurred within the first 10.5, 19, 25, 30, and 55 min, according to FBRM results. The FBRM CLDs revealed that a larger particle size mean resulted in a longer CLD and a lower peak of particle number. The FBRM data revealed that the polymer type had a significant impact on microparticle CLD and the transformation process.

The Effect of Bovine Lung Heparin on Normal Human Platelets as Measured by Electronic Particle Size Analysis

1982 ◽  
Vol 47 (01) ◽  
pp. 005-007 ◽  
Author(s):  
Margaret R McLean ◽  
Lawrence L Hause
Keyword(s):  
Particle Size ◽  
Microscopic Examination ◽  
Platelet Rich Plasma ◽  
Electron Microscopic Examination ◽  
Particle Size Analysis ◽  
Human Platelets ◽  
Size Analysis ◽  
Electron Microscopic ◽  
Before And After ◽  
Normal Human

SummaryThe response of normal human platelets to treatment with bovine lung heparin was evaluated using electronic particle size analysis and aggregometry. Samples for electronic particle size analysis were obtained both before and after the addition of heparin to platelet-rich plasma (PRP). The number of single platelets decreased significantly after the addition of heparin to PRP obtained from 22 individuals. This decrease averaged 18% in 19 samples which did not show a significant increase in transmittance and was at least 70% in 3 samples which showed a significant increase in transmittance. The size distribution of single platelets was not significantly altered. In addition, electron microscopic examination revealed that platelets treated with heparin are activated.

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