scholarly journals Regeneration of Hard Alloy Wastes by Low Energy Consumption and Environmentally Friendly Hydrothermal Technology

2015 ◽  
Vol 16 (1) ◽  
pp. 176-180
Author(s):  
S. F. Korablov
Keyword(s):  
Energy Consumption ◽  
High Performance ◽  
Waste Treatment ◽  
Practical Importance ◽  
Hydrothermal Solution ◽  
Low Energy ◽  
Hard Alloys ◽  
Core Technology ◽  
Low Energy Consumption ◽  
The Cost

Hard alloys are indispensable material for many branches of modern industry. However, even with the base composition (WC-Co) they are quite expensive due to the limited natural resources of cobalt and the complexity of their production from the minerals. Therefore, the collection and recycling of hard alloys waste have not only scientific but practical importance, taking into account that the cost of production of 1 ton of alloy from recovered waste comes to 20% cheaper than in the core technology. Existing methods of hard alloys waste treatment have several disadvantages, the main of which are high power consumption and big load on the environment. As a result of this research a high-performance, low-energy consumption, eco-friendly way for recycling of hard alloys waste has been proposed. According to this technology, in a first step the WC powder, and the solution containing cobalt salts were obtained by autoclaving at 230 °C in a mixture of HCl-H3PO4-HNO3 acids, and followed then metal cobalt  recovery from hydrothermal solution at temperatures of 110 – 160 °C.

scholarly journals House owners’ experience and satisfaction with Danish low-energy houses - focus on ventilation

2019 ◽  
Vol 111 ◽  
pp. 04006
Author(s):  
Henrik N. Knudsen
Keyword(s):  
Energy Consumption ◽  
Air Quality ◽  
High Performance ◽  
Indoor Environment ◽  
Ventilation System ◽  
Low Energy ◽  
Energy Class ◽  
Single Family ◽  
Environment Temperature ◽  
Low Energy Consumption

The purpose of this study was to evaluate house owners’ experience and satisfaction with the first Danish detached low-energy single-family houses, built according to energy class 2015 before these supplementary requirements became standard for all new dwellings. A questionnaire survey was carried out among owners of newly built energy class 2015 houses. The paper presents the house owners answers to questions on their overall satisfaction, their heat consumption, and their satisfaction with the indoor environment (temperature, draught, air quality, noise and daylight). There is a focus on issues related to having a mechanical ventilation system, i.e. satisfaction with the air quality, does the air feel dry in winter, and does the ventilation system make noise and how the airing behaviour is in winter. As many as 370 out of 869 house owners, corresponding to a response rate of 43%, answered the questionnaire. There was an overall satisfaction with the new low-energy houses. More than 90% of the house owners perceived the indoor environment as satisfactory. The energy consumption was as low as expected by 59%, while only 7% answered that it was higher than expected. Compared with previous similar studies, problems with technical installations have decreased. However, there is a need for continued focus on the commissioning of new and not necessarily thoroughly tested, high-performance installations and new designs. Based on the survey a series of recommendations are given that might help to achieve both a low energy consumption and satisfied occupants of new low-energy dwellings.

Hydrothermally synthesized graphene and Fe3O4 nanocomposites for high performance capacitive deionization

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 11967-11972 ◽  
Author(s):  
Haibo Li ◽  
Zhi Yi Leong ◽  
Wenhui Shi ◽  
Jun Zhang ◽  
Tupei Chen ◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Performance ◽  
High Salt ◽  
Low Energy ◽  
Capacitive Deionization ◽  
Low Energy Consumption ◽  
Removal Efficiencies

Capacitive deionization (CDI) devices with low energy consumption and high salt removal efficiencies have attracted much attention.

High performance polarization-sensitive self-powered imaging photodetectors based on a p-Te/n-MoSe2 van der Waals heterojunction with strong interlayer transition

2021 ◽  
Author(s):  
Qixiao Zhao ◽  
Feng Gao ◽  
Hongyu Chen ◽  
Wei Gao ◽  
Mengjia Xia ◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Performance ◽  
Imaging System ◽  
Van Der Waals ◽  
Low Energy ◽  
Low Energy Consumption ◽  
Comprehensive Performance ◽  
Self Powered

A p-Te/n-MoSe2 vdWH polarization-sensitive photodetector with high comprehensive performance is proposed, which would provide an opportunity for constructing a compact monolithic polarization-sensitive imaging system with low energy consumption.

Coralloid Au enables high-performance Zn-CO2 battery and self-driven CO production

2021 ◽  
Author(s):  
Sanshuang Gao ◽  
Mengmeng Jin ◽  
Jiaqiang Sun ◽  
Xijun Liu ◽  
Shusheng Zhang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Current Density ◽  
High Performance ◽  
Co2 Fixation ◽  
High Current Density ◽  
Low Energy ◽  
Co2 Conversion ◽  
High Current ◽  
Key Factors ◽  
Low Energy Consumption

The electrocatalytic CO2 conversion with high current density and low energy consumption are dimerous key factors for practical CO2 fixation. Herein, coralloid Au was prepared via a facile electrodeposition approach,...

Concave ZnFe2O4 Hollow Octahedral Nanocages Derived from Fe-Doped MOF-5 for High-Performance Acetone Sensing at Low-Energy Consumption

2017 ◽  
Vol 56 (22) ◽  
pp. 13646-13650 ◽  
Author(s):  
Xue-Zhi Song ◽  
Yu-Lan Meng ◽  
Zhenquan Tan ◽  
Liang Qiao ◽  
Teng Huang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Performance ◽  
Low Energy ◽  
Low Energy Consumption
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