Complexity of Calcium Arsenate as Revealed by Chemical Analysis of Fractions of Different Particle Size

1938 ◽  
Vol 31 (2) ◽  
pp. 278-280
Author(s):  
Lyle D. Goodhue ◽  
C. C. Cassil
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Calcium Arsenate

scholarly journals The Processing of Beach Sand from Sri Lanka for the Recovery of Titanium Using Magnetic Separation

2003 ◽  
Vol 12 (1) ◽  
pp. 13-22 ◽  
Author(s):  
W. A. P. J. Premaratne ◽  
N. A. Rowson
Keyword(s):  
Particle Size ◽  
Sri Lanka ◽  
Chemical Analysis ◽  
Titanium Content ◽  
Beach Sand ◽  
Magnetic Fraction ◽  
Chemical Characteristics ◽  
Magnetic Separator ◽  
Commercial Grade ◽  
Sand Deposit

An investigation has been carried out to study the mineralogical and chemical characteristics of beach sand deposits from Sri Lanka and application and optimisation of different magnetic separators (induced roll magnetic separator and disc magnetic separator) to improve the recovery of titanium from the deposit. Commercial grade titanium concentrates could be achieved employing both induced roll and disc magnetic separators. However, the titanium recovery increased greatly in the magnetic fraction with a titanium content of commercial grade (up to 63.9% TiO2) when paramagnetic titanium-bearing minerals were separated from beach sand using the disc magnetic separator. The results of the mineralogical and chemical analysis tests for the beach sand deposit indicated that 71% of beach sand was smaller than 355 μm in particle size and more than 99% of titanium content of the deposit was contained in this fraction.

Mineralogical and chemical heterogeneity of three standard clay mineral samples

Clay Minerals ◽  
1996 ◽  
Vol 31 (3) ◽  
pp. 417-422 ◽  
Author(s):  
H. M. Köster
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Clay Mineral ◽  
Chemical Heterogeneity ◽  
X Ray Diffraction ◽  
Accessory Minerals ◽  
Size Fractions ◽  
X Ray ◽  
Compositional Variations

AbstractMineralogical and chemical heterogeneity within three standard clay mineral samples have been identified by X-ray diffraction and chemical analysis of various size-fractions. This heterogeneity is partly attributed to accessory minerals, but mostly to structural and compositional variations in the 2:1 layer minerals of different particle size in the same specimen.

Preparation of Iron Oxide Red from Red Mud

2013 ◽  
Vol 826 ◽  
pp. 92-96
Author(s):  
Zheng Xian Ma ◽  
Qiao Ling Liu ◽  
Lan Qin Wang ◽  
Lu Feng Pang
Keyword(s):  
Particle Size ◽  
Iron Oxide ◽  
Hydrochloric Acid ◽  
Chemical Analysis ◽  
Quality Indicators ◽  
Red Mud ◽  
Chemical Precipitation ◽  
Bayer Process ◽  
Optimal Experimental Condition ◽  
Particle Size Analyzer

With using the red mud of Bayer process and industrial hydrochloric acid as main initial materials, iron oxide red was prepared by chemical precipitation technique. The character of the sample were characterized and analyzed by means of XRD, SEM, particle size analyzer, and chemical analysis methods, respectively. The optimal experimental condition of extraction of iron from red mud was obtained, and the key quality indicators of sample was conformed the requirements of iron oxide red by a variety of test and characterization.

Characterization of Clay from Vale do Mulembá - ES

2008 ◽  
Vol 591-593 ◽  
pp. 487-492 ◽  
Author(s):  
Monica Castoldi Borlini Gadioli ◽  
J.C.G. Correia ◽  
A. Caranassios
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Thermal Analyses ◽  
The Other ◽  
High Plasticity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Characterization Studies ◽  
And Behavior

This work has for objective to characterize the clay from Vale do Mulembá-ES. The Vale do Mulembá is located in Joana D´Arc, Vitória in Espírito Santo State, Brazil. That clay is used in the production of the traditional clay pans of the State, what contributes to the economy of the area. The clay from Vale do Mulembá presents characteristics and behavior different from the other clays used for the production of clay pans. The characterization studies were carried out through chemical analysis, X-ray diffraction, particle size distribution, plasticity and thermal analyses (DTA, TGA). The results showed that the clay is typical kaolinitic, present relatively to the amount high of Al2O3 and high plasticity.

Sampling Bulk Fertilizers

1968 ◽  
Vol 51 (4) ◽  
pp. 859-865
Author(s):  
C W Gehrke ◽  
W L Baker ◽  
G F Krause ◽  
C H Russell
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Mechanical Analysis ◽  
Size Reduction ◽  
Discharge Time ◽  
Particle Size Reduction ◽  
Standard Deviations ◽  
Representative Samples

Abstract An experimental "D" sampler, which encompasses a core of fertilizer in place, and a powered auger sampler are compared with official compartmented probe and stream samplers on dry mixed fertilizer from three types of blending plants in six states. Standard deviations reflecting variability and precision of the "D" tube indicate performance comparable or superior to the official samplers in both chemical and mechanical analysis. The powered auger compared favorably to the official samplers in chemical analysis, but comparison as to mechanical analysis could not be made because particle size reduction occurred. The official stream sampler failed to secure representative samples from baffle-type mixers when the discharge time was unusually short. Improved indexes of sampling accviracy and precision were secured for all samplers used. It is recommended that sec. 2.001(b), as expanded, be raised to official, final action status.

APPARENT FEED PARTICLE SIZE PREFERENCE BY BROILERS

1988 ◽  
Vol 68 (3) ◽  
pp. 923-930 ◽  
Author(s):  
F. J. PORTELLA ◽  
L. J. CASTON ◽  
S. LEESON
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Key Words ◽  
Feed Intake ◽  
Feed Consumption ◽  
Broiler Chicks ◽  
Disappearance Rate ◽  
Large Particles ◽  
Effect Of Particle Size ◽  
Size Preference

Broiler chicks of different ages were used to study particle size disappearance and the effect of particle size on feed intake. The disappearance of particles larger than 1.18 mm was obvious at all ages. However, it was noticed that at 8 and 16 d disappearance of particles between > 1.18 mm and < 2.36 mm was most pronounced. As birds became older, disappearance rate was greatest for particles > 2.36 mm. Throughout a 24-h period, particle breakdown was noted. Birds did eat these smaller particles at the end of a 24-h period, especially when the concentration of large particles was reduced. Chemical analysis revealed that birds selected material on the basis of particle size, since nutrient composition of the diet and of different diet fractions did not change throughout the day. Changing particle size abruptly from crumbles to pellets did not adversely affect overall feed consumption (P > 0.05) or bird performance. Key words: Broiler, particle size preference, crumbles, pellets

Transparent Rubber Compounds. The Effect of Chemical Composition of Magnesium Carbonate Fillers

1941 ◽  
Vol 14 (1) ◽  
pp. 221-226
Author(s):  
Willard F. Bixby ◽  
Howard I. Cramer
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Light Transmission ◽  
Magnesium Carbonate ◽  
High Light ◽  
X Ray ◽  
Rubber Compounds ◽  
Carbonate Sample

Abstract From this investigation the following conclusions may be drawn. 1. The x-ray results of Bixby and Hauser have been substantiated by chemical analysis and by microscopic examination. The magnesium carbonate productive of highest light transmitting properties is of the type: 5MgO.4CO2.xH2O. The normal carbonate, MgCO3, gives very low transmissions. 2. The best Japanese carbonate studied (sample No. 3) is pure 5MgO.4CO2.xH2O. 3. A domestic carbonate (sample No. 20), which is also pure 5MgO.4CO2.xH2O, is commercially available and produces transparency in rubber compounds equal to that obtained with the Japanese product. 4. Domestic carbonates in general contain more carbon dioxide than is required by a 5MgO.4CO2.xH2O carbonate, and are probably mixtures of this material and of the normal carbonate, MgCO3. 5. Light transmitting properties fall rapidly as the proportion of normal carbonate, MgCO3, rises. 6. Carbonates containing less than enough carbon dioxide to provide a 5MgO.4CO2.xH2O carbonate are probably mixtures of this material and hydrated magnesium oxide, MgO.H2O. 7. In preparing basic carbonates for use in producing high light-transmitting rubber, it is better to produce a material with slightly less carbon dioxide than necessary for a 5MgO.4CO2.xH2O carbonate, rather than more. 8. Particle size is an important factor influencing light transmission, especially when the normal carbonate, MgCO3, is present. Generally speaking, especially in the size ranges encountered in these carbonates, a finely divided MgCO3 will offer greater hindrance to the passage of light than will a larger size material.

A dickite with an elongated crystal habit and its dehydroxylation

1959 ◽  
Vol 32 (247) ◽  
pp. 314-323 ◽  
Author(s):  
E. R. Schmidt ◽  
R. O. Heckroodt
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Size Effect ◽  
Particle Size Effect ◽  
Crystal Habit ◽  
Electron Microscopic ◽  
X Ray ◽  
Thermal Data ◽  
Endothermal Effect ◽  
Optical Electron

SummaryDickite from a new occurrence at Barkly East, Cape Province, is described and compared with a previously unreported dickite from Postmasburg and a dickite from Ouray, Colorado. The Barkly East dickite crystals are elongated in the direction of the a-axis; the ratio of length to width of crystals varies from 3:1 to 16:1. Optical, electron microscopic, X-ray, and thermal data and a chemical analysis are given. The thermogram of the fraction smaller than 2 µ e.s.d.1 is characterized by a single peak at 600°C., while that of fractions larger than 2 µ e.s.d. shows a double endothermal effect. This two-stage dehydroxylation of dickite on heating is attributed to a particle size effect.

scholarly journals APPARENT FEED PARTICLE SIZE PREFERENCE BY LAYING HENS

1988 ◽  
Vol 68 (3) ◽  
pp. 915-922 ◽  
Author(s):  
F. J. PORTELLA ◽  
L. J. CASTON ◽  
S. LEESON
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Key Words ◽  
Feed Intake ◽  
Laying Hens ◽  
Adaptation Period ◽  
Disappearance Rate ◽  
Small Particles ◽  
Large Particles ◽  
Size Preference

Trials were designed to investigate the effect of feed particle size on apparent feed intake of laying hens. Feed was offered to five different groups of four birds each as either regular crumbles, mash, large crumbles (trained birds), large crumbles (untrained birds) or small crumbles, respectively. Except for the untrained birds, all birds were given a 15-d adaptation period. In each trial hens were offered 200 g of feed at 05:00 h and at each subsequent hour, until 20:00 h, feed was removed from the trough, sieved, weighed, remixed and returned to the feeders. Chemical analysis of the diet and various diet fractions was undertaken. There was marked disappearance of larger particles when birds were fed regular crumbles. However, smaller particles disappeared as the concentration of large ones decreased throughout the day. There was no marked disappearance of particles smaller than 0.60 mm. Feed intake was comparable when regular crumbles or mash rations were fed. Overall feed intake increased when small particles were offered, while intake decreased when the feed was changed abruptly to one of only large particles. It is concluded that particle size in regular crumbled layer feed is not uniform, and that particle size influences disappearance rate. Key words: Layer, particle preference, nutrient preference

Experimental Study of Leaching Scandium from Chloride Dust

2012 ◽  
Vol 548 ◽  
pp. 305-308 ◽  
Author(s):  
Song Li Liu
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Chemical Analysis ◽  
Dust Particle ◽  
Acid Concentration ◽  
Orthogonal Experiment ◽  
Raw Material ◽  
Solid Ratio

Scandium is concentrated in the dust during TiO2 chlorization. The dust can be used as a raw material from which Scandium is extracted. Scandium leaching conditions such as leaching acid concentration , liquid-solid ratio , leaching temperature and leaching time is investigated with chemical analysis through the orthogonal experiment. The results show that the optimum leaching conditions is: chloride dust particle size is 44 μ m, leaching acid concentration is 15%, liquid-solid ratio is 2:1, leaching temperature is 28 °C, leaching time is 1 h.

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