Blogs
Zinc Concentrate Roasting & Cadmium
Table of ContentsResearch and DiscussionOxidation KineticsDistribution of ElementsThermodynamic ConsiderationsConclusions Cadmium is not the principal recoverable constituent in any ore, but it does occur at a ratio of about 1:200 with zinc. If lead and zinc are considered major products, then the major metal byproduct of the zinc industry was the more than 3 million pounds of cadmium produced in the
Autogenous Grinding & Semi Autogenous Grinding Circuits
Table of Contents Autogenous Grinding CircuitsSAG vs Ball Mill AdvantagesAG & SAG Mill Grinding Compared – Which is BestTesting for Product SizePrimary Autogenous Grinding Concentrators Recent Trends and DevelopmentsAutogenous Mill TypesPrimary Autogenous MillsWet Versus Dry Primary GrindingBasic Plant FlowsheetBasic Primary Grinding Flowsheets Size reduction is the most expensive operation in most mills. Crushing and grinding usually require the greatest portion of
Grinding Circuit Simulation
These programs and the simulation algorithms are discussed below. Note that in some Grinding Circuit Simulations, a residence time distribution model is used. In the MRRC simulation package, however, only the two extremes of well mixed and plug flow through the mill are considered. This approach reduces the amount of input information and computation required in the simulation. Predictions obtained
Pyrometallurgy Chrome Recovery Plant Design
Table of ContentsProcess DescriptionFlowsheet and Operating SequenceEnvironmental IssuesProjected Materials BalanceEquipment and LayoutPilot Plant ConstructionCapital Cost EstimatesConstruction ScheduleTechnical IssuesConclusionsAppendix AStandard Analytical MethodsSelection of Analytical MethodDevelopment of Sample Preparation ProcedureAnalysis of Standard Reference MaterialsSummary of Analytical Procedure Chrome Recovery Plant Design: The purpose of the design phase of this project was to prepare the preliminary design of a pilot plant capable of: treating
Zinc Regrind
The flotation section starts with a bulk concentrate float for lead and copper using four rows of eleven cells each as roughers and scavengers. The froth taken off the roughers is then pumped to a two stage cleaner circuit. Scavenger froth and cleaner tails are returned back to the head of the rougher circuit. Froth from the cleaner circuit goes
Recover Chromium from Scrap Metal
Table of ContentsTechnical ConsiderationsRaw MaterialsGeneral ApproachesSelected ApproachExperimental ProgramMetal SamplesOther Charge MaterialsApparatus50-kW Furnace20-kW FurnaceMethodOxidation ExperimentsReduction ExperimentsResults and DiscussionsScrap MeltingChromium OxidationChromium RecoveryDistribution of Principal ElementsSeparation Between Chromium and IronSeparation Between Chromium & Cobalt & NickelSeparation Between Chromium & Alloying ElementsOxygen UtilizationSlag/Metal SeparationReduction of Chromium-Bearing SlagsReduction with FerrosiliconReduction with other Reducing Agents Although world chromium resources are ample for the foreseeable future, political
How to Size a Cone Crusher Motor
Table of ContentsCalculate Crusher MOTOR HORSEPOWERCone Crusher Motor SizingCALCULATIONSHow to Select the Correct CONE CrusherSIZING THE CONE CRUSHER In the cone crusher capacity table, a maximum motor size recommendation is given for any eccentric throw. Only in rare circumstances is this maximum horsepower required; in many installations a motor of only half the rating of the maximum is required. If
Cone Crusher Maintenance
WOBBLE PLATE FEEDER A wobble plate feeder is furnished as standard equipment with Fine crushing chambers and as optional equipment with Coarse and Intermediate crushing chambers. It consists of a distributing plate to which a wobbling motion is imparted by the gyrating motion of the main shaft. The feeder is equipped with an enclosing hopper and an adjustable feed pipe
Cone Crusher Installation
Tabulated installation drawings show the principal dimensions of the Hydrocone cone crusher, and are sufficiently accurate for preliminary plant layout work. In the smaller sizes (up to 48-in.) the Hydrocone crusher can be discharged vertically downward, or a feed spout can be provided which will convey the crushed product off to one side. Rubber shear mountings permit the crusher to be
Concentrating Table: Wilfley VS Diester Stroke Motion Compared
Table of ContentsDiester Concentrating TableWilfley Concentrating Table Diester Concentrating Table Wilfley Concentrating Table
Hydraulic Gold Mining
Table of ContentsWaterSluiceGradeDitchMiner’s inch of waterBulkheadSluiceRifflesPipeHydraulic Mining MonitorsUndercurrentBarsGradeTailingsBed-rockThe RunClean upRetortingNight LightingDumpDitch BuildingAssayingMercury Hydraulic Gold Mining is the cheapest form of gold mining is that in which the precious metal can be removed from its associated impurities—such as clay, gravel, sandstone and iron—and collected, entirely by the agency of water and mercury, with a minimum of manual labour. This can be
Dredge Construction
Dikes for River Control.—Dredging and the maintenance of dredged depths is intimately related to the subject of the characteristics and regulation of rivers. This, however, is much too broad and far reaching in its scope to be included within the narrow confines of this small book, and will merely be summarized with maximum brevity in order to indicate its bearing
Hydraulic Dredges
Table of ContentsRadial-Feeding Hydraulic Dredge with Spud AnchorageCutter Head DredgeFeeding a hydraulic dredgeHydraulic Dredge DesignForward Feeding or Mississippi River Type There are two general and distinct classes of hydraulic dredges, the River Type and the Sea-going Hopper Dredge. The first is the smaller machine, built for use in the calm waters of rivers and sheltered harbors, and is rarely self-propelling
Dipper Dredges
General Description.—As has been said, the Dipper Dredge “ digs ” like the familiar steam shovel. The bucket, which is essentially a scoop with heavy teeth and a flap bottom, is attached to the end of the dipper stick, which is carried by the boom at or near the centre of the latter. The boom is supported by “A” frame
Grapple Dredges
General Description.—A grapple dredge is, in principle, a derrick mounted on a float and swinging a grab bucket. Any derrick lighter may perform the operation of dredging by simply attaching a grab bucket to its fall. This, however, is merely a makeshift, and by no means constitutes a dredge. The operation of the bucket is but one of three principal
Gold Dredging & Sluice Box
The Metallurgy of Dredging: The gold-saving appliances of a dredge consist respectively of screens, tables, and sluices. The essential duty of the screen is to classify the material prior to concentration, it also serves to disintegrate or break up the material passing over or through it, so that particles of gold may not be carried off in lumps of clay or
Gold Dredges & Gold Dredging
Table of ContentsTypes of Gold DredgesComponents of a Gold DredgeBucket LineDredge LadderLower TumblerUpper TumblerScreenTables and SluicesStackerDredge PumpsWinchHullSteel Super-StructureDredge EnginesBoilerElectrical EquipmentPower PlantsDredge Sizes and CapacitiesDredgingConditionsDredging PossibilitiesDredging Dry Placers We are the first and only concern in this country to devote its whole attention exclusively to the designing and building of gold dredges; therefore, we are especially well equipped to do this work much better and
Dredging Alluvial Gold
The only minerals of any importance which are found in alluvial deposits are gold and other precious metals, tinstone, and those gems which by reason of their hardness and power of resisting chemical changes are preserved in their original state even after being scoured by water for long periods. It is now generally conceded that these alluvial mineral deposits owe
Clamshell Dredge
The grab, or “ clamshell ” type of dredge, consists of a self-filling and discharging scoop or bucket, with the necessary engine power for working this from a crane. Well-known makers of this form of dredge are Messrs. Rose, Downs, & Thompson, Limited (see illustration), and Messrs. Priestman Bros. Both firms recommend, for this purpose, the double-chain grab. A one-ton
Dredge HP Horse Power Requirements
In calculating the horse-power consumed by suction and by bucket dredges, figures have been taken from the various official reports on the mining industry in New Zealand, dates and pages in each instance being given. The calculations are made in theoretical horsepower, and for easy references are given in tabular form. The difference in the weight of the gravel lifted,
Suction Dredge
These machines consist essentially of a floating structure, supplied with a powerful pump of centrifugal type, raising sand and water through a suction pipe. Characteristic types of suction dredges are the Ball and the Welman. The Welman patent pump is in many respects similar to a centrifugal pump; the runner, however, is differently constructed, the vanes or blades being merely
Bucket Dredge
The bucket dredge may be described as a continuous dipper dredge, the material being raised by a revolving chain of dippers or buckets, which scoop or dig into the deposit. The principle and system of raising material in these machines are almost identical with those of harbour dredges. The favourite type of bucket dredge is that known as the endless