Blogs
Sampling and Estimating Disseminated Copper Deposits
Table of ContentsDIAMOND-DRILL SAMPLINGCHURN-DRILL SAMPLINGSAMPLING OF UNDERGROUND WORKINGSCHECKING SAMPLINGESTIMATION OF ORE RESERVESUSE OF GEOLOGY IN ORE ESTIMATIONSTUDY OF MINING AND COSTS BEFORE ESTIMATINGCALCULATION OF TONNAGESUMMARY The sampling of disseminated copper deposits has been described often but the method of combining assays to give the true shape and value of the orebody as it will be mined has received less attention.
Double Roll & Teethed Roll Crusher
Although its brief period of popularity passed some thirty-odd years since, and only a few sets were installed before interest reverted to other types, the high-speed double roll crusher developed by Thomas A. Edison shortly before the end of the last century warrants a place in any discussion-of crushing equipment. In 1960, the largest machine of this type the 6
Rotary Kiln Alignment
Read a great how-to guides on Rotary Kiln Alignment and Alignment of Rotary Kilns as well as this full instruction video.
Rotary Kiln Lining
The lining of the rotary kiln is of the utmost importance, and great care should not only be exercised in selecting the class of brick, but to see that it is well fitted in the kiln in order that success may be achieved. Fortunately, manufacturers are closely studying the question, and are now producing an excellent fire-brick equal to any
Dodge Crusher
A sectional view of the Dodge jaw crusher here below. The mechanism of this machine is so simple that it is hardly necessary to enlarge upon what can be gained from an examination of the cut. In one respect, the Dodge machine is a reversal of the actions we have been discussing; its movable jaw, being pivoted at a
Why do Metals Float
Some of the fundamental principles of this concentration ‘upside down,’ as it may be termed, being such a new method, have been overlooked. There has been such a mad scramble to get results in advance of the ‘other fellow,’ and to penetrate the cloud of secrecy enforced by patent litigation, that there has been little time to answer the question
Impact Crusher
As impact crushing becomes more prevalent in the production of friable as well as some harder types of aggregates, it is natural for those not completely familiar with the process, or recent improvements in technology, to wonder why impactors are being specified in situations previously often considered uneconomical or, at best, marginally feasible for this type of equipment. The simple
Chemistry of Enrichment of Silver Deposits
Table of ContentsPOROSITY OF ENRICHED ORESTHE SILVER HALIDESPRECIPITATING ACTION OF FERROUS SALTSCONDITIONS GOVERNING ENRICHMENTOUTCROPSSILVER-LEAD DEPOSITSSILVER-COPPER DEPOSITSMining and Metallurgy in Foreign CountriesDisposal of Blast-furnace SlagNumbering Iron or Aluminum Castings The processes of superficial alteration depend on physical conditions, environment, geologic history and chemical and mineralogical composition. Superficial alteration is confined particularly to the zone of shallow circulation, as this is the
Blast Furnace Coke Hardness
Table of ContentsWHAT IS GOOD COKESATISFACTORY TEST FOR HARDNESS OF COKECONDITIONS AFFECTING HARDNESS OF COKESUMMARYBlast Furnace Coke Changes in coke hardness affect the working of the blast furnace, for soft coke is an obstacle to proper furnace operation. Soft coke is due to a low hydrogen-oxygen ratio in the coal charged; increasing this ratio increases the hardness of the coke.
Crusher Discharge Product Size & Shape
A striking feature of the non-choking concave, is the character of the product. So far we have been dealing with crushers whose eccentric speeds are low enough to permit the material to fall, with each receding stroke of the active crushing member, the full distance allowed by the close CSS and open side OSS physical proportions of the crushing chamber, regardless of
Working Principle of Crushers
On left is a showing of the “standard gyratory with straight concaves” is a section through any vertical, radial plane in the crushing chamber of one of the intermediate sizes of the crusher. In order to understand the crushing action in such a chamber it is helpful to consider the process as though each step took place in an orderly, and
Estimate Jaw Crusher Capacity
Table of ContentsCapacities and Horsepower of Jaw Crusher (tons/hr)Capacities of a Gyratory Crushers (tons/hr)Typical Capacities of Twin-Roll Crushers (tons/hr)Typical Capacities of Cone CrushersTypical Capacities of Hammermills Example capacity calculation of a 10″ x 20″ (250 mm x 500 mm): Pp = 2800 (2.8 SG) e = 0.2 (halfway between dolomite and sandstone) A = 250/1000 x 500/1000 Wj = 0.5 Nj = 225
Gyratory Crushers
Table of ContentsGyratory CrushersGyratory Crusher Capacity TablesSmall Gyratory Crusher Capacity ChartCrusher DriveGyratory CrusherEccentricity Adjustable to Capacity Demands ADVANTAGES OF BOTTOM DISCHARGELOW OPERATING COSTS VERTICAL ADJUSTMENTSMETHODS OF VERTICAL ADJUSTMENTGyratory Crusher Spider suspensionHydroset mechanismINDEPENDENT HYDRAULIC OIL SYSTEMEASY-TO-CLEAN CRUSHING CHAMBERGyratory SPIDER LUBRICATIONCOUNTERSHAFT BEARING LUBRICATIONHOW a GYRATORY CRUSHER IS LUBRICATEDSYSTEM FILTERS AND COOLS OIL DUST PROTECTIONHOW THE DUST SEAL WORKSProtection for Crushers In Abrasive ConditionsDESIGN FEATURESGyratory
Common Crushing Industry Terms & Vocabulary
There are Crushing Industry Terms, Vocabulary as well as a number of expressions, peculiar to operation of rock crushing plants, have come into common usage among crusher designers and operators. Inasmuch as these terms are used rather loosely, and with a considerable degree of freedom as to their exact meaning, it is desirable to define a few of the more important ones
Secondary Gyratory Crushers
The use of large primary crushers made secondary crushing necessary, but this department was taken care of nicely by the existing lines of standard gyratory machines. In commercial crushed stone plants, there was gradual increase in the number of products, but generally a sufficient demand existed for the coarser grades for ballast and macadam roads to absorb the output. So
Stamp Mill
When stamp mills are used for dry crushing, double discharge mortars are provided (see Fig. 50), and the screens are put low down, giving a small depth of discharge. These arrangements are necessitated by the difficulty of discharging the crushed ore from the mortar, the only means of doing this being the dashing of the dry ore against the screens,
PGM Platinum Mining & Extraction
Platinum-based alloys for high temperature and special applications Development of alternative techniques for matte level measurements in sulphide smelting furnaces Keynote Address Seismic method applied to platinum exploration, a success story Breakeven extraction factors for the Merensky Reef using stope width and market price simulation Data integration for structural interpretation in the Bushveld Complex The optimization of mining method and
Retort Furnace, Retorting Pot & Condensing Pipe
This retort furnace, is an improvement on those formerly constructed. It has three dampers for directing the flames and heat from back to the front end of the retort. As the entire retort and its cover is within the furnace the mercury is equally driven off from all parts of the amalgam, leaving the whole mass equally well retorted. Formerly the