Modeling of particle size distribution of heat assisted high-pressure treated reconstituted cow milk: Effect of high pressure, pressurization time and heat treatment temperature

LWT ◽  
2012 ◽  
Vol 48 (2) ◽  
pp. 255-260 ◽  
Author(s):  
Jatindra K. Sahu ◽  
P. Kumar Mallikarjunan
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
High Pressure ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Cow Milk

Characterization of Zirconia Sizing Nozzle Modifying Addictives Preparated by Sol-Gel Method

2014 ◽  
Vol 1078 ◽  
pp. 31-35
Author(s):  
Liang Zhao ◽  
Qun Hu Xue ◽  
Dong Hai Ding
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Composite Powders ◽  
Gel Method ◽  
X Ray

MgO-Al2O3-ZrO2composite powders with 3 kinds of mass ratio were synthesized by sol–gel method using MgCl2·6H2O, AlCl3·6H2O and ZrOCl2·8H2O as starting materials, and NH3·H2O as a precipitant. The composite powders which match with zirconium oxide particle size and evenly distribute can are advantageous to the formation of metastable t-ZrO2and restrain the grain growth as the additive of modified sizing nozzle. Chemical composition, mineral phase, particle size distribution and micro-morphology of the composite powders were investigated by X-ray fluorescence instrument, X-ray diffractometer, laser particle size analyzer and scanning electron microscope. Research showed that under the process that the concentration of MgCl2solution 0.2 mol/L, AlCl3and ZrOCl2solution concentration 0.5 mol/L, the pH controlled between 10 ~ 11, PEG as the surfactant, drying at 70°C±5°C, heat treatment temperature at 800°C for 3h, particle size distribution of MgO-Al2O3-ZrO2composite powders were: d10= 1.28 μm, d50= 4.65μm, d90= 11.13μm (MgO 10%); d10= 1.15μm, d50= 5.80μm, d90= 15.13μm (MgO 15%);d10= 1.21μm, d50= 6.59μm, d90= 16.87μm (MgO 20%). With the rising of heat treatment temperature, the crystallization degree of composite powders increased, at 800 °C a small amount of t - ZrO2precipitated, meanwhile MgO and Al2O3are still in the amorphous phase. The MgO-A12O3-ZrO2composite powders under this condition have high reactivity and uniform distribution.

scholarly journals Particle Size Effects on Selectivity in Confined Bed Comminution

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 342
Author(s):  
Holger Lieberwirth ◽  
Lisa Kühnel
Keyword(s):  
Particle Size ◽  
High Pressure ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Size Effects ◽  
Experimental Investigations ◽  
Ore Processing ◽  
Tumbling Mills ◽  
Particle Bed ◽  
Vertical Roller

Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for grinding comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement or even replace tumbling mills in ore beneficiation with ore and gangue particles of rather different breakage behaviors. The selectivity in the comminution of a mixture of particles with different strengths but similar particle size distribution (PSD) of the constituents in a particle bed was investigated earlier. The strength of a material is, however, also a function of particle size. Finer particles tend to be more competent than coarser ones of the same material. In industrial ore processing using confined bed comminution, this effect cannot be neglected but even be exploited to increase efficiency. This paper presents research results on this topic based on experimental investigations with model materials and with natural particles, which were stressed in a piston–die press. It appeared that the comminution result substantially depends on the material characteristics, the composition of the mixture and the PSD of the constituents. Conclusions will be drawn for the future applications of selective comminution in mineral processing.

Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ Nanometer Powders by Sol-Gel Method and Research about its Electrochemical Performance

2013 ◽  
Vol 712-715 ◽  
pp. 257-261
Author(s):  
Yin Lin Wu ◽  
Qing Hui Wang ◽  
Ling Wang ◽  
Hai Yan Zhao
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Electrochemical Performance ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Preparation Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

The La0.75Sr0.25Cr0.5Mn0.5O3-δnanometer powders were prepared by citric acid sol-gel method.The samples were characterized by DTA, FT-IR, XRD, TEM techniques. The preparation process, morphology of synthesized powders, the best heat-treatment temperature and the electrochemical performance had been studied. The results show that the spherical nanometer powders can be obtained and the best heat-treatment temperature is 800°C. The particle size is about 30nm and Ea is 0.071 eV.

Preparation and Impaction on the Yield and Abrasion Resistance of Polycrystalline Diamond Powder of Copper/Graphite Raw Materials

2012 ◽  
Vol 550-553 ◽  
pp. 93-98
Author(s):  
Chun Lin Li ◽  
Jian Chen
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Abrasion Resistance ◽  
Heat Treatment Temperature ◽  
Copper Content ◽  
Raw Materials ◽  
Polycrystalline Diamond ◽  
Graphite Powder ◽  
Diamond Powder ◽  
Treatment Temperature

Taking earthy graphite and electrolytic powder as raw materials, copper/graphite raw material is prepared by power metallurgy and then polycrystalline diamond powder is prepared by shock wave synthesis. Impaction on yield and abrasion resistance from copper content, particle size of graphite powder, heat treatment and re-pressing process has been researched. As result, yield of polycrystalline diamond powder is decreasing as decreasing copper content. It is decreased dramatically when the copper content is less than 90%. It is increased and then decreased as increasing the particle size of graphite powder, and the better particle size of graphite powder is 70μm. It is increased slightly and then decreased dramatically as increasing heat treatment temperature before re-pressing. The higher the heat treatment temperature, the more the yield after re-pressing. Impaction on the abrasion resistance of polycrystalline diamond powder from the preparing process of copper/graphite is smaller.

Mechanical Milling Prepared Ultrafine Al2O3 Particles Utilized in Brush Plating Ni-P-Al2O3 Coatings and Influence of Heat Treatment to the Performance of the Coatings

2013 ◽  
Vol 395-396 ◽  
pp. 755-758
Author(s):  
Ai Zhi Yu ◽  
Lian Wang ◽  
Mao Dong Li ◽  
Jin Mei Lin ◽  
Wen Yu
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Abrasion Resistance ◽  
Mechanical Milling ◽  
Erosion Resistance ◽  
Composite Coatings ◽  
Brush Plating ◽  
Steel Substrates

In this paper, ultrafine Al2O3 particles were prepared by mechanical milling, and Ni-P-Al2O3 composite coatings were plated on Q235 steel substrates by brush-plating, which plating solutions were containing different concentrations Al2O3 particles. The morphology, phase and particle size distribution of the as-prepared Al2O3 particles, and the properties of the coatings after heat treatment were investigated. The results show that, the morphology of the as-prepared Al2O3 particles were spherical and almost size under 200nm, the coatings were uniformly thickness and the Al2O3 particles were uniformly dispersed in the coatings. Heat treatment could improve the performances of the brush-plating Ni-P-Al2O3 layers. After 1 hour heat treatment in 400°C, the layer which phosphoric content about 2.3wt% had high rigidity, good abrasion-resistance and adhesion strength, and the layer which phosphoric content about 10.1wt% has good erosion-resistance after 1h heat treatment in 600°C.

The Study of TiO2 Whiskers Prepared by Melt Phase-Splitting Method and their Photocatalytic Properties

2011 ◽  
Vol 287-290 ◽  
pp. 582-587
Author(s):  
Shui Jing Gao ◽  
Wen Li Zhang ◽  
Gui Qin Hou
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Heat Treatment Temperature ◽  
Splitting Method ◽  
Treatment Temperature ◽  
Photocatalytic Properties ◽  
Photocatalytic Efficiency ◽  
Crystal Type ◽  
Pressure Phase ◽  
Melt Phase

This paper studied the preparation of TiO2 whisker with melt phase-splitting method, which used tataniferous blast-furnance as the main raw materrial. XRD and SEM were used to research the phase and morphology of the sample, and by the same time, the photocatalytic properties of TiO2 crystal-beards was tested.The result have shown:the size of TiO2 crystal-beards was sub-micron rank, the crystal type wasβ-TiO2 of orthorhombic high-pressure phase. The generation of TiO2 crystal-beards were effected mainly by the content of Na2O and TiO2, and the heat treatment temperature. The sample had certain photocatalytic properties and the highest photocatalytic efficiency was 56%.

Syntheses of Tabular Cobalt Ferrite Crystal Using Non-Equilibrium Crystallization Conditions

2013 ◽  
Vol 704 ◽  
pp. 161-166
Author(s):  
Gang Jian ◽  
Hui Shao ◽  
Qing Xian Hu ◽  
Sheng Lu
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Heat Treatment Temperature ◽  
Cobalt Ferrite ◽  
Treatment Temperature ◽  
Equilibrium Crystallization ◽  
Primary Particles ◽  
Crystallization Conditions ◽  
Crystallization Stage ◽  
Non Equilibrium

Cobalt ferrite CoFe2O4tabular crystals were synthesized via two-step coprecipitation using non-equilibrium crystallization conditions by supplying a solution of CoCl26H2O and FeCl36H2O and a solution containing NaOH at a later crystallization stage. Mean particle size of ~16.5 nm CoFe2O4primary particles synthesized by coprecipitation showed non-oriented structure. Effect of heat treatment temperature on the microstructures of the final CoFe2O4crystal was examined, orderly arranged plate-like tabular CoFe2O4crystals were formed under calcination at 800 °C. Magnetic hyspersis loops measured at 300 and 5 K indicated the anisotropy in the tabular crystals.

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