Blogs
Flotation Training
https://www.911metallurgist.com/flotation-recovery-cumulative-grade-recovery-curve https://www.911metallurgist.com/mineralogy-flotation-floatability-selectivity https://www.911metallurgist.com/flotation-mass-water-recovery-mineralogy Laboratory Flotation Testing Services
Cyclic Voltammetry
A few representative cycles from the first 20 oxidation/reduction cycles for a pyrite electrode in 0.1 M sodium borate are presented in Figure 3. The first scan was made in the cathodic direction starting from the rest potential of the mineral which typically had a value of 0.18 V. The large reduction peak observed in the first cycle shows the
Pyrite Buffer in Soil
The Gunnison, Colorado, tailings provide an example of the chemical reactions across the interface with soils rich in pyrite but low in calcite. In this case, the retardation of trace components is determined primarily from the Eh controls and less from the pH (Johnson, 1985). The compositions of groundwater from wells in the vicinity of the tailings were used to
How to Fast Track Construction a Mining Project
The construction schedule is a very important part of any complex construction project. If used properly it can alert the construction manager to a variety of problems including ability to complete the project on schedule, overtime construction required to keep on schedule, increase in construction personnel, impact of late equipment arrival, impact of detail engineering delays, and other potential problems.
Laws of Gravity Gold
Ten Laws of Gravity Gold Recovery DO DON’T Try to Evaluate the Economic Impact of Gravity Recovery Get a Statistically Significant Sample of the Ore to Evaluate Gravity Response on a Size-by-Size basis Design the Gold Recovery Circuit with a Good Understanding of Gold’s Behaviour in Grinding Circuits When GRG Recovery Is Not Indicated, Look at Other Options Design the
Effect of Cupric Ammine on Gold Dissolution Rate
The dissolution of gold in ammoniacal solutions cannot take place in the absence of oxidants. Cupric ammine can act as an oxidant in this system according to Equation 3. The effect of cupric ammine concentration on the dissolution rate of gold was investigated in a solution of 0.6 M total ammonia concentration (0.1 M (NH4)2SO4 and 0.4 M NH3). The
Autogeneous Grinding VS Steel Grinding Media in Flotation
In grinding, the use of steel media in a rod/ball mill circuit clearly diminishes the subsequent froth flotation performance over purely autogenous grinding. The use of recycle water in grinding also clearly diminishes the subsequent froth flotation performance associated with fresh tap water. Some of these flotation deficiencies are recoverable by using stronger collectors at higher dosages. On the positive
Magnesioferrite
In the case of pellets it was observed that incremental additions of olivine to any of a series of pellet concentrates invariably caused the pellets to become progressively more ferromagnetic after induration. At first, it was assumed that what little magnesioferrite formed in such pellets stabilized magnetite, a comparable spinel structure, in solid solution. However a systematic study showed that
SAG Mill Manufacturer
Here is a list of the SAG Mill Manufacturers & Suppliers I know: FLSmidth Metso Outotec CITIC-Heavy Industries Co. Ltd Thyssenkrupp – Polysius Farnell-Thompson TyazhMash 911Metallurgy A highlight of SAG milling has been the collaboration between grinding mill manufacturers and mining companies. Experimental work on very large mills is difficult, expensive, and potentially catastrophic if it goes wrong, yet the work must
Cone Crushers
Table of ContentsIntroductionSecondary CrushersTertiary CrushersFine CrushersDesign FeaturesCrusher SelectionFeed Size and CapacityCrusher VariablesOther VariablesCrushing CircuitFeed and Product DataOperating ConditionsAutomatic Control Introduction Compared to the gyratory crusher, the cone crusher is characterized by its higher speed and a flat crushing chamber design which is intended to give a high capacity and reduction ratio for materials suitable to this type of processing. The
Gyratory Screens
Gyratory Screen Separators impart a combined gyratory and vertical motion and arc used for fine-screening applications, wet or dry, down to 40 pm, including laboratory use. The basic components consist of a nest of sieves up to around 2.7 m in diameter supported on a table that is mounted on springs on a base. Suspended from beneath the table is a
Wood Crib Engineering Method & Design
Table of ContentsSupport Construction and Loading BehaviorDesign CriteriaParameters That Affect The Strength Of WoodEnvironmental ConditionsSpeciesGrain OrientationMoisture ContentLoad RateCreep and RelaxationLoad ConditionsFactors To Consider In Wood-Crib ConstructionType of WoodTimber DimensionsMining HeightOverhanging ConstructionNumber of Timbers Per LayerWood-Crib Performance ModelMethodology For Model UtilizationModel LimitationsMixed SpeciesConfiguration LimitationsLoad ApplicationNonlinear BehaviorEmployment StrategiesDesign and Employment CriteriaCrib StiffnessMaximum Crib CapacityCrib StabilityRoof-and-Floor Contact PressuresCrib Spacing and Employment CostDesign and
Longwall Mining Method and Design
Table of ContentsLongwall Mining Design FactorsSeam SequencingInteraction for Descending OrderPressure Bulb TheoryArching Theory in MiningInteraction for Ascending OrderSubsidence TroughInterseam ShearingSimultaneous and Random Orders of ExtractionGate Road Pillar DesignYield Pillar ApproachConventional Longwall Mining ApproachOther Design ConsiderationsOrientation of Gate Roads and PanelsOffset Gate RoadsSuperimposed Gate RoadsStaggered Gate RoadsMulsim/NL ModelingCrossing A Gob-Solid Coal BoundaryIsolated Gate Roads above Panel Studies estimate that 156 billion
Grouted Rock Bolting Procedure
Table of ContentsPreparation of BoltPreparation of GaugeGauge SelectionAbradingConditioningNeutralizingBondable TerminalsTapeGauge PreparationAdhesive SelectionPressure PadsAttaching Gauge to BoltCuring Gauge AdhesiveAttaching Lead WiresGauge PretestApplication of Protective CoatingsApplication of EpoxyCalibration Procedures Since the introduction of rock bolts 40 years ago, their use to support and stabilize openings in U.S. mines has steadily increased. The number of roof falls has been significantly reduced where rock bolts
In Situ Copper Leaching Operations Hydrologic Design
Table of ContentsRepresentative Elemental VolumeRepresentative Elemental DomainHydrologic Field MeasurementsIn Situ Leach Mining FacilityTransmissivity EstimatesUnivariate StatisticsStructural AnalysisOmni-directional VariogramDirectional VariogramEstimationKrigingStochastic SimulationSimulated AnnealingSimulated Transmissivity FieldIdentifying Uncertainty-Risk AssessmentISLM Design ApplicationHeap Leach DesignOther ConsiderationsConclusions In situ leach mining (ISLM) is an advanced selective mining technique used for the exploitation of copper oxide deposits. ISLM involves the injection of a solution into a deposit, the dissolution
Thiosulfate Leaching of Gold from Copper Bearing Ores
Table of ContentsGold from Copper-Bearing OresAmmoniacal Thiosulfate LeachingExperimentalResults and DiscussionRotating DiskOre LeachingSummary and ConclusionsAcknowledgements Cyanide has been used in the mining industry for gold and silver recovery for almost a century. It is cost-effective and achieves excellent extractions from a wide range of ores. However, considerable interest has been expressed in non-cyanide lixiviants since the early 1980’s. In addition to
Iron Ore Pelletizatton Layering Mechanism
Pelletization is the unit operation of agglomerating moist particulate materials by tumbling in horizontal rotating drums or inclined discs. Pelletization has extended the life of iron ore industry by enabling the treatment of low grade iron ores which are available in large reserves through out the world. Iron ore pelletization is a two step process consisting of pellet production in
Batch Flocculation of Fines
Flocculation is the process of agglomerating fine particles in solid-liquid suspension by using a high molecular weight long chain polymer as a flocculant. It is used industrially as a pretreatment step to solid-liquid separation and also as a separation method for recovering valuable minerals from gangue using selective flocculation. Spontaneous floc formation takes place due to nucleation mechanism. That is,
Dewatering Flocculated Clay with Centrifuge
The dewatering of flocculated clay suspensions by compression in a centrifugal field has been investigated. The results are evaluated with regard to both direct applicability to centrifugal dewatering, in solid-bowl centrifuges for example, and indirect applications to gravity sedimentation systems. It is well known that sediment consolidation under gravity depends on structural characteristics such as permeability and on the “self-weight”
Effect of Collector & Frother Concentration on Copper Flotation
Table of ContentsExperimental ProcedureResults and Discussion The flotation process may be considered an interactive system consisting of many chemical, operational, and equipment variables. Changing any one of these variables causes an overall system response change. This study examines the effects of simultaneously changing the operating variables of: (1) frother concentration and air flow rate, and (2) frother concentration and collector
Tri-Flo
Table of ContentsThe Multi-Stage SeparationThe Multi-Density SeparationThe Separating MediumIndustrial Applications During several years of operation in Europe, South Africa and other countries, the Tri-Flo has demonstrated to represent a substantial improvement of the dense medium dynamic separation systems. The reasons are: high sharpness separation due to the multistage system and the application of new concepts m designing the regeneration circuit
Collectorless Sulphide Flotation
Evidence for the floatability of sulphide minerals without collector is analyzed and it is shown that results obtained with ores, in contrast to those with single minerals or mineral mixtures, depend on many additional variables, some identified and others not. Because of the prevailing low levels and costs of collectors for most sulphide ores, it is unlikely that collectorless flotation
Amine Flotation Systems
Table of ContentsSurface Forces MeasurementsFlotation ExperimentsResultsFlotation Result Using a Mark IV surface force apparatus, adsorption of dodecylamine hydrochloride on mica has been studied at pH 5.7 in the presence and absence of octanol. With amine alone, the repulsive forces between mica surfaces are reduced due to charge neutralization and attractive hydrophobic force; however, the latter is of relatively short-range with