Using Particle-Size Distribution Technology for Designing High-Density, High-Performance Cement Slurries in Demanding Frontier Exploration Wells in South Oman

2000 ◽  
Author(s):  
Bipin Jain ◽  
A.M.P. Raiturkar ◽  
Chris Holmes ◽  
Andrew Dahlin
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
High Performance ◽  
High Density

scholarly journals Reaction Mechanism and Process Control of Hydrogen Reduction of Ammonium Perrhenate

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 640
Author(s):  
Junjie Tang ◽  
Yuan Sun ◽  
Chunwei Zhang ◽  
Long Wang ◽  
Yizhou Zhou ◽  
...  
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Hydrogen Reduction ◽  
Reduction Rate ◽  
Reduction Reaction ◽  
High Density ◽  
Reduction Temperature ◽  
Ammonium Perrhenate

The preparation of rhenium powder by a hydrogen reduction of ammonium perrhenate is the only industrial production method. However, due to the uneven particle size distribution and large particle size of rhenium powder, it is difficult to prepare high-density rhenium ingot. Moreover, the existing process requires a secondary high-temperature reduction and the deoxidization process is complex and requires a high-temperature resistance of the equipment. Attempting to tackle the difficulties, this paper described a novel process to improve the particle size distribution uniformity and reduce the particle size of rhenium powder, aiming to produce a high-density rhenium ingot, and ammonium perrhenate is completely reduced by hydrogen at a low temperature. When the particle size of the rhenium powder was 19.74 µm, the density of the pressed rhenium ingot was 20.106 g/cm3, which was close to the theoretical density of rhenium. In addition, the hydrogen reduction mechanism of ammonium perrhenate was investigated in this paper. The results showed that the disproportionation of ReO3 decreased the rate of the reduction reaction, and the XRD and XPS patterns showed that the increase in the reduction temperature was conducive to increasing the reduction reaction rate and reducing the influence of disproportionation on the reduction process. At the same reduction temperature, reducing the particle sizes of ammonium perrhenate was conducive to increasing the hydrogen reduction rate and reducing the influence of the disproportionation.

Synthesis of hypoxia-high density TZM alloy based on mechanochemistry and particle size distribution theories

2017 ◽  
Vol 698 ◽  
pp. 994-1001 ◽  
Author(s):  
Ping Hu ◽  
Tian Chang ◽  
Zhi-tao Yu ◽  
Fan Yang ◽  
Bo-liang Hu ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
High Density

Effects of Particle Size Distribution on Compacted Density of Lithium Iron Phosphate 18650 Battery

2018 ◽  
Vol 15 (4) ◽  
Author(s):  
Lei Chen ◽  
Zhenyu Chen ◽  
Shuaishuai Liu ◽  
Biaofeng Gao ◽  
Junwei Wang
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
High Performance ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Specific Discharge ◽  
Average Size ◽  
Discharge Capacities ◽  
Selection Of

The effects of particle size distribution on compacted density of as-prepared spherical lithium iron phosphate (LFP) LFP-1 and LFP-2 materials electrode for high-performance 18650 Li-ion batteries are investigated systemically, while the selection of two commercial materials LFP-3 and LFP-4 as a comparison. The morphology study and physical characterization results show that the LFP materials are composed of numerous particles with an average size of 300–500 nm, and have well-developed interconnected pore structure and a specific surface area of 13–15 m2/g. For CR2032 coin-type cell, the specific discharge capacities of the LFP-1 and LFP-2 are about 165 mAh/g at 0.2 C. For 18650 batteries, results indicate that the LFP-3 material has the highest compacted density of 2.52 g/cm3 at a concentrated particle size distribution such as D10 = 0.56 μm, D50 = 1.46 μm, and D90 = 6.53 μm. By mixing two different particle sizes of LFP-1 and LFP-2, the compaction density can be increased significantly from 1.90 g/cm3 to 2.25 g/cm3.

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