Crushing Chestnut to Produce Buckwheat

Crushing Chestnut to Produce Buckwheat

Table of ContentsHistory of Anthracite Crushing PracticesDescription of EquipmentPennsylvania Reversible ImpactorPennsylvania Kue-Ken Jaw CrusherPennsylvania Rolling Ring GranulatorPennsylvania Kue-Ken GyraconeTelsmith Style S Gyrasphere The crushing of chestnut-size (1-5/8 by 13/16 inch) Pennsylvania anthracite in four commercial crushers (impact, jaw crusher, hammer mill, and gyratory types) was studied by the Bureau of Mines to determine which could … Read more

Radioisotopes Applications

Table of ContentsLicensing RequirementsHazards and PrecautionsAvailability of RadioisotopesThe Laboratory FacilityInstruments and MethodsNature and Scope of ResearchTypical Applications of RadioisotopesPlanned Research with Radioisotopes Many factors contributed to the decision to build a radiochemical laboratory at the Salt Lake City Metallurgy Research Center to investigate the application of radioactive isotopes and chemical compounds in extractive metallurgy. These … Read more

How to Determine Trace Impurities in Helium

Table of ContentsLiquid-Helium TrapOperation of ApparatusCalculations An apparatus for determining trace impurities in Grade-A helium by mass spectrometer methods was designed and built by the Federal Bureau of Mines. Grade-A is the designation for helium commercially produced by the Bureau. Its nominal purity is 99.995 percent. The device, following a suggestion by Deaton, concentrates the … Read more

How to Design an Underground Mine Opening in Rock

Table of ContentsWhat is Competent RockClassification of Competent RockPhysical Properties of RockAssumption Regarding Stress FieldAssumptions Regarding Criteria of FailureEffects of TimeSafety FactorDesign of Single Openings in Massive RockIntroductionCircular OpeningsElliptical OpeningsOvaloidal OpeningsRectangular OpeningsInclined OpeningsSpherical and Spheroidal OpeningsDesign PrinciplesIllustrative ProblemDesign of Multiple Openings in Massive RockIntroductionRow of Circular OpeningsRow of Ovaloidal OpeningsAverage Pillar StressCompressive Strength of PillarsIllustrative … Read more

How Impurities Affect Titanium Properties

The purpose of this investigation was to determine the effects of the impurities, oxygen, nitrogen, carbon, and iron (in low percentages) on the mechanical properties of electrolytic titanium. The strength and hardness of binary Ti-O, Ti-N, and Ti-C alloys are linear functions of alloy content in the composition range investigated. Compared to oxygen and carbon, … Read more

How to Increase Tensile Strength Titanium

Antimony up to 10 percent increases the strength of titanium by solid-solution hardening. The general relationship of hardness, strength, and elongation in these alloys is similar to that found in several grades of high-purity and commercial titanium. Tensile strength (annealed condition) appeared to be a linear function of Vickers hardness regardless of composition. For equivalent … Read more

Electrorefining Beryllium

Results of the preliminary tests have demonstrated the possibility of electrorefining beryllium in KCl-LiCl-BeCl2 baths. Qualitative spectrograph analyses of the starting material and the products indicate the following estimated percentages of reduction of metallic impurities: Magnesium was reduced by at least 50 percent. Iron, copper, silicon, and manganese were reduced by at least a slight … Read more

Fine Screening using Sieve Bend

Table of ContentsAcknowledgmentsDescription of Equipment and Test ProceduresMethod of Evaluating EfficiencyInfluence of Operating VariablesFeed RatePulp RatioInfluence of Feed CompositionInfluence of Undersize MaterialInfluence of Near-Aperture Size MaterialTests on Natural Feeds The cleaning of fine coal, particularly for metallurgical use, is receiving greater attention. An increase in the proportion of fine coal in the run-of-mine product has … Read more

Detecting Rubidium and Cesium

Table of ContentsOccurrence of Cesium and RubidiumEvaluation of Known MethodsFlame and Bead TestsMicrochemical TestsChemical Spot TestsExtraction of Rubidium and Cesium from Raw MaterialsField Test for Cesium and RubidiumSample PreparationDissolution of Cesium and RubidiumSpot TestingChemicals and Equipment RequiredChemicalsEquipment A semi-quantitative test for the presence and identification of cesium and rubidium in rocks, clays, and mineral waters … Read more

Limonite Siderite Iron Ore Beneficiation

Table of ContentsWashing and SizingRoasting and Magnetic SeparationConnors Brothers DepositLimoniteSideriteMixed Limonite and SideriteO. C. Pouns DepositLimoniteSideriteMixed Limonite and SideriteLee Ben Pynson DepositLimoniteSideriteMixed Limonite and SideriteEttie Lattimer DepositLimoniteSideriteMixed Limonite and SideriteOxidation-Reduction of Mixed OresComparison of Magnetite and Maghemite (Gamma-Hematite)Flash Roasting A laboratory mineral-dressing investigation was conducted by the Federal Bureau of Mines on four limonitic and … Read more