Hardness and Toughness of Rocks

Hardness and Toughness of Rocks

The speed of drilling rock has become an important factor in mining operations, while the placement of holes, kind, and quantity of explosive used are equally important. These are a function of the rock hardness and toughness. Both of these factors must be considered in compiling a table that will enable a mine operator or … Read more


Table of ContentsConcasseurs PrimairesConcasseurs a MachoiresConcasseurs GiratoiresComparer Concasseurs PrimairesConcasseurs SecondairesConcasseurs a ConeTypes de Concasseurs de PierreCircuits de Concassage Le concassage constitue la premiere etape de la comminution. Son objectif n’est pas la liberation des mineraux, mais simplement la reduction de dimension afin de faciliter la manipulation ulterieure du minerai. II est normalement fait a sec … Read more

Use of Bleaching Clays in Water Purification

Table of ContentsAdvantages of Bleaching ClayUse of Clay at AtlantaConclusionAcknowledgments Bleaching clays have been used extensively in the oil-refining industries for a number of years. Their use in water purification is relatively recent and less extensive. They are frequently classified as (1) those naturally active and (2) those active after artificial activation with acid. Fuller’s … Read more

Ball Mill Grinding

Table of ContentsBall Rod and Pebble MillsBall LoadsScreens and FlakinessUnits of SurfaceBatch and Continuous Grinding ComparedBatch Ball Milling at Various Speeds and Ore ChargesBest Wet  and Dry Batch Ball MillingSelection of Volume of Ball Loads in Continuous Dry Open Circuit GrindingNonferrous Media and Steel Balls ComparedSillimanite BallsTetrahedrons and Spherical Balls ComparedBattered Reject Balls and New … Read more

How to Remove Quartz & Impurities from Refractory Clays

Table of ContentsPhysical and Chemical CharacterBeneficiationDetermination of Firing PropertiesLaboratory InvestigationsSandy Flint Clay A. P. G. 1Physical and Chemical CharacterBeneficiationWet-Table and Wet-Cyclone ConcentrationDetermination of Firing PropertiesSandy Flint Clay H.-W. 2 Physical and Chemical CharacterBeneficiationWet-Table and Wet-Cyclone ConcentrationDetermination of Firing PropertiesSandy Plastic Clay A, P. G. 3Physical and Chemical CharacterBeneficiationWet-Table and Wet-Cyclone ConcentrationDetermination of Firing PropertiesPyritic Plastic … Read more

Fine Grain Lead Zinc Sulfides Flotation

Table of ContentsThe OresPhysical CharacterChemical DescriptionLaboratory StudiesNabob OreHighland Surprise OrePend Oreille OreLiberal King OreSidney OreDouglas Ore This investigation has shown that lead and zinc sulfide minerals, in pulps containing particles all less than 9 microns in size, may be selectively recovered by froth flotation. All but one of the samples yielded lead concentrates-containing at least … Read more

Explosives Explosions and Flames

Table of ContentsResearch and Technologic ActivitiesExplosion, Flame, and. Combustion ResearchCombustion StudiesIgnition StudiesResearch on Explosion Hazards in Operations Involving Flammable Gases and LiquidsDetermination of Flammability Characteristics of Individual CompoundsExplosives Research and TestingApplied ResearchFundamental Explosives ResearchEvaluation of Explosives and Blasting DevicesExperimental Coal Mine and Dust Explosions ResearchExperimental Coal MineDust Explosion Galleries and ChambersDust Explosion LaboratoriesMeetings and ConferencesExplosion, … Read more

Spectrograph Analysis of Tungsten

Table of ContentsScope and Outline of MethodEquipmentExperimental Effect of Germanium Added to TungstenVolatilization StudiesX-Ray Analyses of ChargesDetails of the MethodPreparation of Standards and SamplesProcedureOperating ConditionsResults of Analyses One of the main advantages of this method for estimating impurities in tungsten is that the analysis is performed on the metal. Ideally, samples and standards should be … Read more

How to Separate of Tantalum from Columbium

Table of ContentsMaterialsExperimental Procedure and ResultsSmall-Scale TestsInitial CoextractionSeparation of Tantalum from ColumbiumProcedure for High-Columbium MaterialsProcedure for High-Tantalum MaterialsAssay Procedure for Equal Amounts of Tantalum and ColumbiumSeparation of Tantalum from Columbium in Special CasesReuse of SolutionsRecycling Feed SolutionsReconditioning Methyl Isobutyl KetoneRate of Transfer TestsLarge-Scale TestsApparatusProcedure and Results for Mixer-Settler ColumnStepwise Tests, Mixer-Settler Column with Gravity Feed … Read more