A Review on Some Applications of Magnesia in Current China Refractories Industry

Being rich in the magnesite resource,China hasbecome the biggest magnesia-based products manufac-turer.With nearly300magnesite mines including somenewly built magnesite processing plants,China has to-tal output of over14million tons magnesite ore peryear,…     

A Review of: “Superheated Steam Drying” by Mikhailov Yu.A. Energia,Moscow, 1967, 199 p. (in Russian)

This paper presents a general overview of Freeze-Drying (Lyophilization) and discusses the underlying principles of the process. Emphasis has been placed on the freeze-drying of biological materials and special mention has been made to the formulation of bio products prior to processing     

Review of: “Impregnation,Drying and Adhesive Coating Equipment”by Konovalov 7.1. and Koval A.M. Khimia,Moscow, 1989, 222 p. (in Russian)

Zeolites have potential to increase efficiency of medium-temperature drying in the food industry. This work concerns the comparison between conventional dryers and dryers using air dehumidified by zeolite. Steady-state mass and energy balances have been used and the work concerns drying temperatures ranging from 52 to 70°C. Process integration based on pinch analysis has been applied and nine different heat exchanger networks for energy recovery are compared. Results indicated that dryers using air dehumidifier by zeolites are 10–18% more efficient than conventional dryers.     

Reply to the discussion of the paper “Understanding expansion in calcium sulfoaluminate-belite cements” by G.L. Valenti,M. Marroccoli,M.L. Pace,A. Telesca

Reply to the discussion of the paper “Understanding expansion in calcium sulfoaluminatebelite cements” by G.L. Valenti, M. Marroccoli, M.L. Pace, A. Telesca.     

A Review of: “Interfacial Phenomena in Polymers,by Yuri S. Lipatov. Naukova Dumka Publ., Kiev, 1980, 259 pp. (in Russian).”

Bonding aluminum metal and its alloys with epoxy adhesives is sensitive to process variables, particularly surface contamination and moisture exposure. In the past, several surface modification schemes have been developed to improve the epoxy-bonding of aluminum. The present work describes a simple process that produces significant improvement in strength and durability of epoxy-bonded aluminum. In this process, aluminum surfaces are first rinsed with dilute sodium metasilicate solution followed by a dilute aqueous epoxysilane solution. The combination of the two materials exhibits a bond strength synergism as measured by bondline fracture toughness. The treated aluminum surface also exhibits a significant increase in bond strength tolerance to contamination and moisture exposure. The effect of epoxysilane chemical structure on bond durability was examined, as was the role of the silicate surface treatment.