Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Archives of Materials Science and Engineering

2 2015

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: copper droplets coagulation

Sortuj według:

Ogranicz wyniki do:

Mechanical strength and reliability of the porous materials used as adsorbents/catalysts and the new development trends

David E.

Archives of Materials Science and Engineering

2015

Vol. 73, nr 1

5--17

Purpose: This paper aims to provide an understanding on some aspects of the porous material strength and reliability and to present future trends of the research on the mechanical properties of this solid porous materials. Design/methodology/approach: It shows that a multitest approach must be designed in order to measure the particle strength and then optimise the production process to enhance its strength. This approach combines measurements reproducing the different types of stress generated in the separation or catalytic process with an extensive characterisation of the physical and mechanical properties of the porous solid, such as hardness, fracture toughnes, brittle, crushing, attrition, etc. The methodology outlined here on alumina single particle or bulk goes beyond the common practice of evaluating mechanical strength based on a comparative study using a single-crushing test and a bulk-crushing test. Findings: Some recent developments on the basic mechanics of solid porous materials are shown. The main concepts presented are the brittle fracture which leads to the mechanical failure of the porous materials, the measurement and statistical properties of the strength data, the mechanical reliability of the porous material pellets, the mechanical properties of the adsorbent or catalyst packed beds, etc. The use and use limitations of inorganic binders for increasing the mechanical strength is discussed and the most binder systems are presented. Research limitations/implications: The scientific basis for the issues on the adsorbent/ catalyst mechanical properties calls yet for further elucidation and development. Practical implications: It is pointed out that porous materials used as adsorbents/ catalysts, with a high and uniform distributed mechanical strength are beneficial to industrial, energetic and environmental applications. Originality/value: A new route for improving mechanical strength of adsorbents/catalysts will become an unavoidable task not only for their manufacturing but also for to improve the efficiency of separation and catalysis processes

Gravity/buoyancy competition within coagulation of copper droplets in slag

Wołczyński W., Bydałek A. W.

Archives of Materials Science and Engineering

2015

Vol. 76, nr 1

35--45

Purpose: A suspension of copper droplets in the slag coming from the direct-to-blister process was subjected to the treatment analogous to that usually applied to the electric arcfurnace process. In particular, recently patented by authors, complex reagent was applied and verified. Design/methodology/approach: The suspension was subjected to coagulation and solidification. Both processes were studied, independently. The suspension of droplets was treated not only by the recently patented complex reagent but by the CaO – industrial compound (in the amount of 5 %wt.) as well, to make comparison between both substances effectiveness. Findings: The observation was focused on the behavior of droplets to conclude whether the droplets are settled on the crucible bottom due to the effect of gravity or pushed to the liquid slag’s surface due to buoyancy force influence. In the case of the patented reagent application, the coagulation mainly was completed by the droplets’ settlement on the crucible bottom. The treatment performed with the use of the CaO – compound promoted the influence of buoyancy force. The coagulated copper droplets were pushed to the liquid slag’s surface. Research limitations/implications: Rest reagents known in the industry practice will be subjected to the analogous analysis in order to make further comparison with the effect of the patented chemical. Practical implications: Conclusion from the performed experiment made in the crucible (laboratory scale) allow to suggest how to improve not only the semi- or fully industrial directto-blister technology but the treatment of the slag in the electric arc-furnace as well.