How to Recover Thermal Energy from Molten Salts

How to Recover Thermal Energy from Molten Salts

Table of ContentsSpecific Experimental ObjectivesExperimental EquipmentExperimental ProcedureExperimental Results and DiscussionHeat TransferSteam Turbine OperationChemical Reactions and Chemical Composition of Effluent GasesCorrosion Rates of Materials of ConstructionSalt EntrainmentPipe Plugging One objective of Project Gnome is to study the feasibility of a phase of the Plowshare program recovering thermal energy from an underground nuclear explosion. The test will … Read more

Uranium Mining

Table of ContentsLabor and Living ConditionsDescription of DepositsExplorationMesa No. 2 MineContract-Mining OperationsMesa No. 2-½ -MineMesa No. 1-¾ Mine This report is one of a series published by the Federal Bureau of Mines to describe methods and costs of mining uranium on the Colorado Plateau. The Navajo Uranium Division of Kerr-McGee Oil Industries, Inc., mines uranium … Read more

Bacterial Copper Leaching

Among several suggested new processes for treating marginal ores in the United States, none is more intriguing than the possibility of extracting metals from low-grade materials by the action of microorganisms. One phase of a Federal Bureau of Mines investigation toward developing such a procedure was to isolate and identify specific chemosynthetic iron- and sulfur-oxidizing … Read more

Dry Filter Cake using Radiant Heat – Reduce Moisture

Table of ContentsTheoretical ConsiderationsTest ApparatusTest ProcedureSynthetic SlurriesThickener Underflow ProductFroth Flotation ConcentrateEconomic Considerations This report stems from a study by the Bureau of Mines of the possibility of reducing coal filter-cake moisture by applying radiant heat directly to the filter cake while under vacuum during the drying phase of the filter cycle. One disk of a … Read more

Titanium Gadolinium Phase Diagram

The results of this investigation indicate that the titanium-gadolinium phase diagram is composed of a single eutectic reaction and a peritectoid reaction at the alpha-beta transformation. The eutectic isotherm has been established at 1,240 ± 10° C. and extends from approximately 1 pct. gadolinium to beyond 99 pct. gadolinium at this temperature. The solid solubility … Read more

Extract Aluminum from Aluminum Silicon Alloys

Table of ContentsAluminum Extraction ProcessApplication of Extraction Process, Procedure and ResultsCrude Alloy FeedInduction-Heated UnitElectrical-Resistance-Heated UnitGas-Fired UnitStudy of Process ConditionsPressureLeaching The following conclusions are drawn from the results of these investigations: The reflux leaching method is an effective means for extracting aluminum from crude Al-Si alloy. Aluminum obtained by this method will contain from 1 to … Read more

How to Make Zirconium Diboride Directly from Zircon

Table of ContentsExperimental ProceduresEquipmentMaterialsMethod of PreparationExperimental ResultsDiscussion of Results Zirconium diboride of a quality comparable to that produced commercially from zirconium dioxide may be synthesized directly from zircon. The quantities of residual carbon and silica are not excessively high, but it is believed that some refinements in procedure may lower these percentages. The grain size … Read more

Zirconium Gadolinium Equilibrium Diagram

The investigation of the zirconium-gadolinium equilibrium diagram revealed a eutectic system with limited terminal solubilities and one peritectoid reaction. The eutectic point occurs at about 82 percent gadolinium. The eutectic isotherm, at 1,220° C., extends from about 12 to 99+ percent gadolinium. The peritectoid isotherm, at 890° C., involving the alpha-beta transformation of zirconium, extends … Read more

Sulfide Oxide Lead Zinc Transitional Ore Treatment Processing Method

Table of ContentsBeneficiation ResearchFroth FlotationDeslimed pulpUndeslimed PulpFlotation Plus Gravity SeparationHeavy-Media Separation and TablingFlotation of Oxidized Zinc The mineral dressing research here reported is part of a continuing program by the Bureau of Mines to develop new or improved concentration processes for oxidized or partly oxidized lead and zinc ores. A sample of low-grade sulfide-oxide, lead-zinc … Read more

Casting Titanium Zirconium and Hafnium

Table of ContentsAcknowledgmentsExperimental Procedures and Results Casting Method Furnace OperationFurnace DesignSafety ConsiderationAlloying MethodsMold MaterialsMachined GraphiteRammed Mold MaterialCentrifugal CastingPhysical Properties of Cast MaterialProcess Variables The work covered in this report is a continuation of an earlier feasibility study by the Federal Bureau of Mines and points out improvements in the skull-melting method for casting reactive metals … Read more