Surface temperature of the melt during the latter period averaged 1,540° C. Throughout the entire refining period a jet of air was blown into the furnace over the molten charge. This procedure increased oxidation of the charge impurities to such an extent that the analysis of the poured metal was: Fe 99.3, Si 0.05, C 0.29, P 0.004, and S 0.01.

A machine and method for drilling bore holes and tunnels by melting in which a housing is provided for supporting a heat source and a heated end portion and in which the necessary melting heat is delivered to the walls of the end portion at a rate sufficient to melt rock and during operation of which the molten material may be disposed adjacent the boring zone in cracks in the rock and as a ...

A tunneling machine for producing large tunnels in rock by progressive detachment of the tunnel core by thermal melting a boundary kerf into the tunnel face and simultaneously forming an initial tunnel wall support by deflecting the molten materials against the tunnel walls to provide, when solidified, a continuous liner; and fragmenting the ...

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@article{osti_7111588, title = {Rapid excavation by rock melting (LASL Subterrene Program). Status report, September 1973--June 1976}, author = {Hanold, R J}, abstractNote = {Research was directed at establishing the technical and economic feasibility of excavation systems based upon the rock-melting (Subterrene) concept. A series of electrically powered, small-diameter prototype melting ...

machines that melt through rock at 5 mile per hour, creating the turnnels for high ... but the cost of tunneling from coast to coast would. To be economically feasible, engineers would ... reactor core to the tunnel face, where it melts the rock. In the process of melting the rock the lithium loses some of its heat.

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Rapid Excavation by Rock Melting-- LASL Subterrene Program --December 31, 1972, to September 1, 1973 alamos ... Conceptual designs of large-diameter tunnel-boring machines were ... unconeolidated ground and very hard abrasive rocks. A benefit-to-cost.

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The technique of kerf melting is analytically treated, and conceptual melting-face configurations for a soft-ground and hard-rock-melting tunneler are presented. The utilization of a compact heat-pipe-cooled nuclear reactor to supply the energy for a large-diameter melting tunneler advancing at …

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A tunneling machine for producing large tunnels in rock by progressive detachment of the tunnel core by thermal melting a boundary kerf into the tunnel face and simultaneously forming an initial tunnel wall support by deflecting the molten materials against the tunnel walls to provide, when solidified, a continuous liner; and fragmenting the ...