The Effect of Grinding on the Ground Material Flowability

2007 ◽  
Vol 24 (4-5) ◽  
pp. 328-331
Author(s):  
Evgeny Grant ◽  
Haim Kalman ◽  
Moshe Averbuh
Keyword(s):  
Ground Material

Generic Performance Tests for the Fertilizer Sample Preparation Laboratory

1995 ◽  
Vol 78 (2) ◽  
pp. 294-300
Author(s):  
Robert L Beine ◽  
David H Tompkins ◽  
Kirk R Ranta ◽  
Julio Puentes
Keyword(s):  
Sample Preparation ◽  
Performance Testing ◽  
Empirical Method ◽  
Performance Tests ◽  
Measuring Time ◽  
Fertilizer Sample ◽  
Initial Reduction ◽  
Good Sample ◽  
Almost All ◽  
Ground Material

Abstract Good sample preparation is an essential first step to almost all laboratory analytical procedures. The procedures presented are intended to stimulate interest in generic methods for performance testing of various steps in fertilizer sample preparation, including initial reduction of unground sample, grinding, and mixing. Sample reduction quality is measured by 2 types of procedures, the first using 2 sizes of glass beads for a more theoretical approach, and the second using 2 common fertilizer materials for a more empirical method. Grinding performance is measured by recovery and carryover methods, followed by particle size and uniformity estimates of the ground material. Mixing after grinding is tested by measuring time-to-blend of a segregated mixture.

Energy Parameters of the Binder during Activation in the Vortex Layer Apparatus

2019 ◽  
Vol 945 ◽  
pp. 98-103 ◽  
Author(s):  
Ruslan A. Ibragimov ◽  
Evgeniy V. Korolev ◽  
T.R. Deberdeev ◽  
V.V. Leksin ◽  
Denis B. Solovev
Keyword(s):  
Material Science ◽  
Fill Factor ◽  
Impact Force ◽  
Ferromagnetic Particle ◽  
Particle Collision ◽  
Test Device ◽  
Vortex Layer ◽  
The Impact ◽  
Ground Material ◽  
Grinding Time

Improving the efficiency of construction composites is a relevant problem for modern-day material science. One of the ways to solve the problem consists in activating the binders by means of vortex-layer devices. Mathematical transformations produced a formula for calculating the dependency of the number of ferromagnetic-particle collision on the number and velocity of such particles, as well as on the device chamber fill factor. The results obtained by applying the proposed formula differ from D.D. Logvinenko's model by 10% at max. We calculated the impact force, the impulse of the grinding body in the vortex-layer device, as well as the amount of applied energy per unit of mass of the ground material. It was found out that the impact force and the impulse of force were maximized in the test device. At the same time, energy applied over the grinding time necessary to even out the binder dispersion in the vortex-layer device was 2 to 4.8 times greater compared to conventional devices.

scholarly journals Application of Chemically Modified and Unmodified Waste Biological Sorbents in Treatment of Wastewater

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
John Kanayochukwu Nduka
Keyword(s):  
Particle Size ◽  
Contact Time ◽  
Textile Wastewater ◽  
Maximum Temperature ◽  
Detergent Solution ◽  
Percentage Reduction ◽  
Corn Cob ◽  
Chemically Modified ◽  
Glass Column ◽  
Ground Material

Protein wastes (feathers, goat hair) and cellulosic wastes (corn cob, coconut husks) were collected and washed with detergent solution, thoroughly rinsed and sun dried for 2 days before drying in an oven, and then ground. One-half of ground material was carbonized at a maximum temperature of 500°C after mixing with H2SO4. The carbonized parts were pulverized; both carbonized and uncarbonized sorbents were sieved into two particle sizes of 325 and 625 μm using mechanical sieve. Sorbents of a given particle size were packed into glass column.Then, textile wastewater that had its physicochemical parameters previously determined was eluted into each glass column and a contact time of 60 and 120 mins was allowed before analysis. Results showed 48.15–99.98 percentage reduction of , EC, Cl−, BOD, COD, DO, TSS, and TDS, 34.67–99.93 percentage reduction of , EC, Cl−, BOD, COD, DO, TSS, and TDS, 52.83–97.95 percentage reduction of Pb2+, Ni2+, Cr3+and Mn2+and 34.59–94.87 percentage reduction of Pb2+, Ni2+, Cr3+and Mn2+. Carbonization, small particle, size and longer contact time enhanced the sorption capabilities of the sorbents. These show that protein and cellulosic wastes can be used to detoxify wastewater.

scholarly journals Virtual Walking with Omnidirectional Movies and Foot Vibrations: Scene-Congruent Vibrations Enhance Walking-Related Sensations and Ground Material Perceptions

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Junya Nakamura ◽  
Yusuke Matsuda ◽  
Tomohiro Amemiya ◽  
Yasushi Ikei ◽  
Michiteru Kitazaki
Keyword(s):  
Ground Material

Fracture Mechanisms in Bovine Aorta

2010 ◽  
Author(s):  
Henry W. Haslach ◽  
Jonathan Chung ◽  
Aviva Molotsky
Keyword(s):  
Collagen Fiber ◽  
Vascular Tissue ◽  
Circulatory System ◽  
Fracture Mechanisms ◽  
Load Carrying ◽  
Life Threatening ◽  
Homogeneous Matrix ◽  
The Media ◽  
Artery Tissue ◽  
Ground Material

Rupture of vascular tissue in the circulatory system under non-impact loading is involved in potentially life threatening events such as Marfan’s syndrome or rupture of small renal veins during shock wave lithotripsy. The rupture mechanisms are not well-understood. The complexity of the artery wall precludes the use of rupture theories invented for metals or for fibered composites with a homogeneous matrix. Artery tissue is composed of ground material, smooth muscle cells, elastin and collagen. The collagen fibers, which are generally circumferentially oriented, are the load carrying material after large deformations. Clark and Glagov [1] propose that the media of an elastic artery is built of musculo-elastic fascicles made up of a layer of circumferentially oriented SMC that lie parallel and between two elastin lamellae. Between the elastin sheets of adjacent elements are interspersed collagen fiber bundles.

scholarly journals Probable reliability prediction of the dam constructed with ground materials of the Nam Chien hydraulic power system in Vietnam using the Monte Carlo method

2018 ◽  
Vol 230 ◽  
pp. 02019
Author(s):  
Andrii Mozgovuy ◽  
Svitlana Butnik
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Statistical Tests ◽  
Current Method ◽  
Reliability Prediction ◽  
Hydraulic Power ◽  
Stochastic Nature ◽  
The Monte Carlo Method ◽  
Ground Material ◽  
Water Overflow

The current method of probabilistic safety assesses dams with ground material by the criterion of water overflow through the dam crest. Due to the stochastic nature of the material properties, loads and impacts method involves the use of the Monte Carlo method (statistical tests). The algorithm was tested on the example of the ground material dams of Nam Chien hydropower in the Vietnam.

scholarly journals Design, Construction, and Operation of a High-Energy Mill for Handling Magnesium Powder

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
J. C. Paredes Rojas ◽  
L. E. Álvarez Ramírez ◽  
G. Urriolagoitia Sosa ◽  
C. R. Torres San Miguel ◽  
B. Romero Ángeles ◽  
...  
Keyword(s):  
Cooling System ◽  
High Energy ◽  
304 Stainless Steel ◽  
X Ray ◽  
Powder Particles ◽  
Physical And Chemical ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Ground Material ◽  
Design Construction

A high-energy mill was designed and built with the purpose of processing magnesium (Mg) powders. The main characteristics of the mill are grinding capacity of 1 kg and demolition elements of 10 kg; it has a distributed form to the interior ten blades of similar geometry, six of which are of the same size and four of them were increased in length in order to avoid the accumulation of the ground material. It has a jacket with a diameter of 240 mm as a cooling system to prevent high temperatures during grinding and possible chemical reactions; likewise, type 304 stainless steel was used for its construction. 10 mills were made during a period of 4, 6, and 8 hours, in order to obtain microparticles; with these particles, an analysis of X-ray spectroscopy was made to verify their physical and chemical characteristics. The outcome shows powder particles with dimensions of 0.1-4 mm, which will be used to the storage and handling hydrogen in the solid state (MgH2).

Performance of Screening Biomass Feedstocks Using Star and Deck Screen Machines

2018 ◽  
Vol 34 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Heesung Woo ◽  
Han-Sup Han
Keyword(s):  
Size Distribution ◽  
Biomass Conversion ◽  
Size Class ◽  
Biomass Energy ◽  
Wood Chips ◽  
Biomass Feedstocks ◽  
Key Characteristics ◽  
Set Up ◽  
Ground Material

Abstract. The most commonly traded forms of biomass energy feedstock are chipped (wood chips) and ground (hog fuel) materials. Of these two feedstocks, particle size distribution is one of the key characteristics that affect efficient feedstock handling and biomass conversion. This paper compares productivity and effectiveness of star screener and deck screeners in separating chipped and ground material. Both machines were set up to separate feedstock into three different size categories: unders (<10 mm), accepts (10-51 mm), and overs (>51 mm). Results from the study indicated that the star screener (62.61 and 50.95 tons/h) was more productive than the deck screener (26.80 and 15.63 tons/h) when separating wood chips and hog fuel. Also, there was additional cost to apply screening systems to distribute the size of the materials; $3.53/ton and $6.05/ton for deck screen with wood chips and hog fuel and $1.61/ton and $1.98/ton for star screen with wood chips and hog fuel. For size distribution of screened materials, the 13-mm size materials had the highest portion of the accept size class, and the 25-mm size materials were primarily found in the oversize class, and pan size materials (e.g., sawdust) had the highest portion of the under size class. The feedstock materials screened using star and deck screening machines still had size variations exceeding over or under sizes in the under, accept, and over size classes. To improve the quality of screened materials, definitions of the size (under, accept, and over) should to be further refined. Keywords: Biomass feedstock, Deck screen, Hog fuel, Size distribution, Star screen, Wood chips.

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