This investigation primarily consists of measurement of the rate of reduction of FeO from sulfur‐free slag. Preliminary measurements of the effect of sulfur on the rate of reduction and the sulfide capacity of the iron‐rich slags have also been made. The results show that with increasing SiO2 contents the rate of reduction is decreased. The influence of sulfur could not definitely be clarified.
Thermal insulation with thermal resistivities of at least 20 (h ft 2 F/ Btu in.) have been shown to have the potential for significant energy conservation if employed in residential and commercial refrigerator/freezers Many materials and systems have been proposed which may be incorporated into refrigerator/freezers to achieve this potential. The current state of the art for advanced evacuated insulations which may achieve resistivities of 20 was established by reviewing data on many materials available in the open literature on the dependence of the thermal performance on internal pressure. The costs for the powdered, fiber, foam and multilayer materials were then obtained from the manufacturer of the products Possible candidate materials for m- clusion into refrigerator/freezers are described and ranked based upon their thermal properties and costs. Several materials were found that may be used to make super-insulation panels with material costs of less than $1.00 per board foot, if a plastic laminate is used for the container required to maintain the necessary vacuum. Materials falling in this category included. Beverly silica dust, open-cell polyurethane foam, fine perlite, 2.7 lb/ft3 fiberglass and 3.6 lb/ft3 fiberglass opacified with vapor-deposited alu minum, precipitated silica, and mixtures of precipitated silica and fly ash. Mate rial costs approaching $3.00 per board foot will result if metallic contamment is required.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.