Blogs
Thiourea Gold Leaching
Table of ContentsAdsorption Gold Thiourea & Cation Exchange ResinThiourea ConcentrationThiourea Consumption during Gold Leaching The use of thiourea, (CS(NH2)2 as a complexing/extracting agent for gold and other precious metals has shown promise for implementation in the mining/metals industry. Laboratory testing of this reagent has indicated that a thiourea process for gold extraction has several advantages over conventional processing techniques. The
Downdraft Tables
Table of ContentsBlower FeaturesTable Top FeaturesFilter FeaturesDowndraft Tables : SpecificationsOptionsWarrantyDowndraft TablesTabletop FeaturesFilter FeaturesBlowers features As well as metal working, welding or cutting, downdraft tables are also used for human dissection tables although rim exhausts are usually used for this purpose. For manual shoe repair and during application of artificial fingernails, downdraft tables are the only type of exhaust possible. Larger
Total Cyanide Determination by Reflux Distillation
The determination of aqueous cyanide is accomplished by either detection in the sample as collected or by removal of the cyanide of the collected sample, followed by detection. The direct determination of the cyanide content of a solution can only be used in the simplest of systems, since many interferences can result in errors. Thus the most widely used method
Zinc Chloride & Electrowinning
Table of ContentsMonopolar Cell Test Materials, Equipment, ProceduresDescription of 2,000-Amp Monopolar CellCell Feed MaterialOperating Procedure for 60-Day RunResults of Monopolar Cell 60-Day RunBipolar CellBipolar ConceptDescription of Initial Bipolar CellOther Bipolar Assemblies TestedConclusions and Discussion To help assure an ample domestic supply of zinc and other essential minerals which provide the foundation of the Nation’s economy and security, the Bureau of
Nickel & Cobalt Electrowinning
Table of ContentsExperimental Equipment and ProcedureExperimental Results and DiscussionsEffect of Nickel ConcentrationEffect of Nickel Extraction and Hydrogen Ion ConcentrationEffect of Current DensityEffect of TemperatureComparison With Electrowinning in a Diaphragm CellEffect of Additives to ElectrolyteSodium SulfateBoric AcidElectrowinning at 85° CElectrowinning From Laterite ProcessingExperimental Cobalt ElectrowinningConclusion As part of the goal to develop technology that can meet critical and strategic needs of
Recover Scrap Battery Lead by Electrolysis
Table of ContentsMaterials, Equipment, And ProceduresBattery ScrapElectrodesElectrolyteCellsOperating the Electrolytic CellResults and DiscussionElectrorefiningOperating ParametersElectrolyte CompositionAdditive ConcentrationCurrent Density, Electrolyte Temperature, Electrode SpacingCycle TimeSlime BlanketPhosphorus ContentCharacterization of SlimesEnergy ConsumptionElectrowinningBattery SludgeSludge LeachingOperating ParametersAnodesCathode QualityEnergy ConsumptionConclusions One objective is the secondary recovery of metals, minerals, and other values from waste products and the development of uses for them. In line with this objective, research was
Explosive to Maximize Rock Permeability
Explosive Selection to Maximize Permeability Enhancement: As can be seen from the previous sections the single most important scaling parameter is the postshot cavity radius or sprung hole diameter. From Figures 5 and 7 it can be seen that permeability enhancement is considerably diminished at a distance of 6-10 rc from the center of the hole. Accordingly, the larger the postshot
Gangue Depressant in Molybdenum Flotation
Table of ContentsEffect of Conditioning TimeEffect of pHEffect Nokes ReagentEffect of Sodium Cyanide ConcentrationPreliminary Mill Testing Sodium cyanide and Nokes reagent are commonly used depressants to reject iron, copper, and lead sulfide minerals for the flotation recovery and upgrading of molybdenite concentrate. With the ever increasing cost of reagents and more stringent regulations, it is necessary that these depressants are
Crushing of Mica Ore
Table of ContentsPneumatic Concentration MethodsEquipment and MethodMethods of AnalysisExperimental ResultsArizona Mica-Bearing PegmatiteJaw CrusherRoll CrusherHammer MillMica-Bearing PegmatiteMica Schist Crushing of mica prior to pneumatic processing technique were studied for concentrating coarse mica. Muscovite and phlogophite are the two major commercial mica minerals. However, this research was conducted exclusively with muscovite, and throughout this paper mica will mean muscovite. Two primary forms
Recover Copper in Smelter Dust
Table of ContentsMaterialsCharacterization of Dust SamplesEquipment and ProceduresCarbothermic Reduction Studies and ResultsSulfidizing Studies and ResultsConverting Copper Matte to Blister CopperResults of Conversion StudiesDiscussion of ResultsFlue Dust SamplesConclusions The Bureau of Mines researched methods for recovering copper from cyclone and electrostatic-precipitator dusts of primary copper smelters as part of its program to maximize minerals and metals recovery from primary and secondary
How to Control a SAG Grinding Mill Circuit
Autogenous and semi-autogenous grinding have experienced renewed interest as efforts to reduce operating and capital costs have increased. As a result, the mill operator is faced with new equipment perhaps ten times as large as was common in the sixties and new circuit designs with different operating characteristics. No longer can he grab a handful of mill discharge to estimate
Dielectric Separator
Objective: To separate complex mineral mixtures according to their dielectric properties. Approach: Develop a laboratory-scale continuous dielectric separator to separate mineral mixtures by exploiting their difference in dielectric properties. How Continuous Dielectric Separator for Mineral Beneficiation Works Dielectric separation is defined as the separation of particles based on their dielectric properties. The uniqueness of the Bureau’s continuous separator, called the “Rotating Drum
Gold Placer Mining
Table of ContentsChoosing a Gold Placer Mining MethodGold PanningGold Rocker & CradleDip-BoxLong TomSluiceAdditional Methods Sometimes UsedDry Washer Surf Washer Gold Beach DepositsSkindiving GoldProblems in Placer MiningBouldersTrouble With Clays and Cemented GravelsCleaning Bedrock When a site where gold is known to occur has been found, and after it has been sampled and judged worthy of further effort, the ownership status should be
Gold Placer Prospecting
Table of ContentsWhere to Find Placer GoldProspect for Placer Gold in CaliforniaPlacer Gold Prospecting in AlaskaFind Placer Gold in Montana, Idaho, Oregon, & WashingtonLook for Placer Gold in NevadaDiscover Placer Gold in ColoradoProspecting for Placer Gold in USAHow to Look for Gold Placer DepositsProspecting EquipmentBasic Gold Prospecting EquipmentSuppliesSafety NeedsShould you Invest and MineSampling TechniquesHow to Calculate the Value of a Gold Placer Placer
Gold Dredging Process Plant
Once aboard the dredge, the dredged material is classified, its valuable portion recovered, and its waste portion disposed in a coordinated recovery disposal system designed to handle the capacity of the digging system. Also on board are the dredging-support equipment of the spuds, winches, and controls, and the water-supply systems. The recovery equipment consists of a hopper, revolving screen, distributor
Gold Dredging Methods & Systems
Table of ContentsHistory of Equipment DevelopmentDredging SystemsHydraulic SystemMechanical Continuous SystemMechanical Repetitive System At present dredge mining in this country is at a low level. The last gold dredge in California stopped operating in October 1968. Gold dredging in the adjacent States had already ceased because of increasing operating costs, decreasing placer values, and the fixed price of gold. Two gold
Microbubble Flotation Column
Table of ContentsERIEZ Flotation Column cellsNon-metallic Mineral Flotation by Microcel ColumnMicrocel ColumnLaboratory and Pilot-Scale TestingKaolin ClayPhosphateFeldspar TailingGraphite The Microcel™ sparger consists of in-line static mixers and a centrifugal pump. Tailings slurry is pumped from the base of the column through the static mixers, where air and slurry are mixed under high-shear conditions to create the bubble dispersion. As the air-slurry mixture passes through the stationary blades
Flour Gold Recovery
Flour gold can be defined as ultra-fine gold found in a low micron size fraction, often smaller than 74 microns or 200 mesh. Reality is that with today’s fine gold recovery equipment, this is a low ways away from the elusive microscopic gold small prospectors want to know how to recover. Falcon’s iCon gravity concentrator, in conjunction with a
Placer Gold Mining
Table of ContentsEvaluation MethodsReserve CriteriaCriteria for Calculation of ReservesMining PlanEquipment SelectionExcavation and Tailings DisposalProcessing Plant The location of a prospect usually results from some physical evidence of the presence of gold and/or past mining activity. Any earlier activity that may have produced gold from the prospect, should be investigated before making the trip. The initial reconnaissance should attempt to verify
Shaking Table Motions
Shaker tables, as the name implies, utilized a Shaking action for conveying the refuse and discharging it over the refuse end. The tables were hung from rods attached to overhead supporting beams. A shaft and cam arrangement at one end of the table served as the actuating mechanism and imparted to the table an endwise, back-and-forth, swinging motion. A shaking
Eddy Current Separator
Several types of eddy current separators have been developed in recent years. These separators range from slide chutes lined with alternating permanent magnets to electromagnetic circuits that generate a pulsed field when conducting material is sensed. The illustrated rotating permanent magnetic field eddy-current separator has proven to be most effective in view of capital cost, operating cost, and separation efficiency.
Eddy Current Aluminium Separation
The eddy-current separator was initially developed to recover non-ferrous metals from shredded automobile scrap or municipal solid waste. In these applications the metallic fraction consists of relatively large items such as various crushed automobile engine components or aluminum beverage cans resulting in excellent separation efficencies. The repulsion of aluminum beverage cans from a rotating permanent magnetic field eddy-current separator that