Comprehensive recovery of metals in spent Ni–Mo/γ–Al2O3 hydrofining catalyst

2021 ◽  
pp. 105800
Author(s):  
Yuanyuan Cai ◽  
Liwen Ma ◽  
Xiaoli Xi ◽  
Zuoren Nie ◽  
Zijie Yang
Keyword(s):  
Comprehensive Recovery

Comprehensive recovery of arsenic and antimony from arsenic-rich copper smelter dust

2021 ◽  
Vol 413 ◽  
pp. 125365
Author(s):  
Jianrong Xue ◽  
Dongping Long ◽  
Hong Zhong ◽  
Shuai Wang ◽  
Lihua Liu
Keyword(s):  
Copper Smelter ◽  
Comprehensive Recovery ◽  
Copper Smelter Dust

The Venezuelan Enterprise: Current Situation, Challenges and Opportunities

2021 ◽  
Author(s):  
José Luis Saboin
Keyword(s):  
Firm Level ◽  
Challenges And Opportunities ◽  
Investment And Financing ◽  
Basic Services ◽  
Different Dimensions ◽  
And Performance ◽  
And Migration ◽  
Comprehensive Recovery ◽  
Enterprise Survey ◽  
Infrastructure Services

Using Enterprise Survey data, this study describes the characteristics of current Venezuelan firms the survivors of one of the deepest economic contractions of modern historyacross different dimensions, such as access to infrastructure services, firms investment and financing, labor and skills, foreign trade, the legal environment, and firms innovation and performance. The study identifies the main challenges faced by the surviving firms (notably: macroeconomic and political instability, unreliability of basic services, lack of credit, and migration), while identifying some of the opportunities for these firms to exploit if a comprehensive recovery strategy for the country were to be implemented. In this sense, I find that the representative Venezuelan survivor firm has managed to internationalize through several channels (foreign ownership, exports, and international quality certifications), as well as to match skills with current business and market demands and keep innovating. The study also briefly analyzes some of the traditional determinants of (labor) productivity at the firm level, bringing the most interesting aspects to the fore so they can be explored further in more topic-focused research.

Comprehensive Recovery of Iron and Aluminum from Ordinary Bayer Red Mud by Reductive Sintering–Magnetic Separation–Digesting Process

JOM ◽  
2019 ◽  
Vol 71 (9) ◽  
pp. 2936-2943 ◽  
Author(s):  
Feng Gao ◽  
Jihao Zhang ◽  
Xinjie Deng ◽  
Kaituo Wang ◽  
Chunlin He ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Red Mud ◽  
Bayer Red Mud ◽  
Comprehensive Recovery

Fracture Behavior of Ultrafine-Grained Titanium Under Tension at Elevated Temperatures

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
S. V. Sajadifar ◽  
H. J. Maier ◽  
T. Niendorf ◽  
G. G. Yapici
Keyword(s):  
Fracture Behavior ◽  
Elevated Temperatures ◽  
Rate Sensitivity ◽  
Void Coalescence ◽  
Strain Rates ◽  
Enhanced Diffusion ◽  
Deformation Response ◽  
Ultrafine Grained ◽  
Highly Sensitive ◽  
Comprehensive Recovery

Abstract This investigation focused on the deformation response and microstructural changes of severely deformed titanium during post-severe plastic deformation tension, at temperatures of 300–600 °C and at strain rates of 0.001–0.1 s−1. The obtained results suggest that SPD enhances the strength of grade 4 titanium up to 500 °C. At above 600 °C, the severely deformed microstructure showed comprehensive recovery. Severely deformed titanium was seen to be highly sensitive to the deformation rate, where strain rate sensitivity increased with the increase of test temperature. Analysis of fracture surfaces reveals that at elevated temperatures, growth of dimples and void coalescence occurs due to the enhanced diffusion rate and occurrence of recrystallized grains.

Comprehensive Recovery of Aluminum and Calcium from Aluminum-Anodizing Sludge by Physicochemical Process

2021 ◽  
Vol 7 (3) ◽  
pp. 1343-1353
Author(s):  
Hongyang Wang ◽  
Xiaoxue Zhang ◽  
Xu Peng ◽  
Liqun Luo ◽  
Leiting Shen
Keyword(s):  
Physicochemical Process ◽  
Comprehensive Recovery ◽  
Aluminum Anodizing

scholarly journals Comprehensive recovery and recycle of jarosite residues from zinc hydrometallurgy

2020 ◽  
Vol 3 ◽  
pp. 100023
Author(s):  
Yayun Wang ◽  
Huifen Yang ◽  
Ge Zhang ◽  
Jinxing Kang ◽  
Chuanlong Wang
Keyword(s):  
Comprehensive Recovery ◽  
Zinc Hydrometallurgy

scholarly journals Sunspot observations by Hisako Koyama: 1945–1996

2019 ◽  
Vol 492 (3) ◽  
pp. 4513-4527 ◽  
Author(s):  
Hisashi Hayakawa ◽  
Frédéric Clette ◽  
Toshihiro Horaguchi ◽  
Tomoya Iju ◽  
Delores J Knipp ◽  
...  
Keyword(s):  
Sunspot Number ◽  
Digital Data ◽  
Future Research ◽  
Number Series ◽  
Long Duration ◽  
Baseline Shift ◽  
Group Sunspot Number ◽  
Primary Reference ◽  
Comprehensive Recovery

ABSTRACT Sunspot records are the only observational tracer of solar activity that provides a fundamental, multicentury reference. Its homogeneity has been largely maintained with a succession of long-duration visual observers. In this article, we examine observations of one of the primary reference sunspot observers, Hisako Koyama. By consulting original archives of the National Museum of Nature and Science of Japan (hereafter, NMNS), we retrace the main steps of her solar-observing career, from 1945 to 1996. We also present the reconstruction of a full digital data base of her sunspot observations at the NMNS, with her original drawings and logbooks. Here, we extend the availability of her observational data from 1947–1984 to 1945–1996. Comparisons with the international sunspot number (Version 2) and with the group sunspot number series show a good global stability of Koyama's observations, with only temporary fluctuations over the main interval 1947–1982. Identifying drawings made by alternate observers throughout the series, we find that a single downward baseline shift in the record coincides with the partial contribution of replacement observers mostly after 1983. We determine the correction factor to bring the second part (1983–1996) to the same scale with Koyama's main interval (1947–1982). We find a downward jump by 9 per cent after 1983, which then remains stable until 1995. Overall, the high quality of Koyama's observations with her life-long dedication leaves a lasting legacy of this exceptional personal achievement. With this comprehensive recovery, we now make the totality of this legacy directly accessible and exploitable for future research.

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