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The following remarks on the use of the fire assay fluxes and litharge may serve as an aid in arriving to a correct composition of charges for most cases:. Litharge or red lead is added in the proportion of one or two parts to two of ore; if too much litharge (lead oxide) is used the slags are not clean, as a slag containing lead may mean a loss of silver and gold.
This invention relates to a novel fire assay flux composition including, inter alia, a dispersant in the form of a source of phosphate; a primary reductant in the form of iron powder comprising particles having a particle size of 60 mesh and finer, at least one basic flux and at least one acidic flux. The fire assay flux composition is useful for the fire assay analysis of Platinum Group ...
fire assay process, an ore or concentrate i s pulverized, placed in a firing crucible, litharge (PbO) is added to provide a source of elemental l ead, flux is
The fusion cycles recommended in the literature and those usually obtained with a conventional furnace are compared and the influence of such cycles on precious metal losses and on slag behaviour are discussed. Gold and silver prills produced by fire assay show .
cooled, it is separated from the slag and cupelled. • When lead is used as a collector, the lead oxidizes and is absorbed into the ... GOLD BY LEAD COLLECTION FIRE ASSAY/INSTRUMENT FINISH TRACE LEVELS LIMITS FAA 313 Gold by Fire Assay, AAS, nominal weight 30g 5ppb10,000ppb FAI313 Gold by Fire Assay, ICPAES, nominal
The composition of the bottom ash or boiler slag particles is controlled primarily by the source of the coal and not by the type of furnace. Table43 presents a chemical analysis of selected samples of bottom ash and boiler slag from different coal types and different regions.
A fire assay fusion is a typical example of a controlled oxidation reduction reaction. As the fusion progresses, the impurities are converted to their oxide stete and absorbed by the slag,
The most common unit of fire assay samples is called the Assay Ton, which is grams of ore. A milligram () gram of gold in a sample weighing grams gives an assay equivalent to 1 troy ounce of gold in a ton (2,000 pound) of ore. A troy ounce is ounces.
Mar 01, 2006· Slag compositions for fire assay slags from Merensky and UG2 ores were calculated from the sample composition and the fluxes that were added. The data is presented in Table 2 so that density and viscosities can be presented for these systems.
Standard Practice for Fire Assay Silver Corrections in Analysis of Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Silver Determination in Slags and Cupels E2296 03(2013) Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and ...
Fire Assay is a technique which analyzes the amount of precious metal (gold, silver, palladium and platinum) in a sample of ore or scrap. It is generally regarded as the most accurate (710 ppb or /t), economical, and consistent method for gold analysis, though it is time consuming.
All of your fire assay needs are available through VWR. Consumable items such as Alpine Cupels, APGreen and Anachemia crucibles, custom made flux, fluxing reagents including borax, soda ash, silica and litharge. We offer the Mines Assay 3 electric fusion and cupellation furnace, as well as larger gas cupellation and fusion furnaces.
Fire Assay Fusion. A sample size of 5 to 50 grams can be used, but the routine size is 30 g for rock pulps, soils or sediments (exploration samples). The sample is mixed with fire assay fluxes (borax, soda ash, silica, litharge) and with Ag added as a collector and the mixture is placed in a fire clay crucible.
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Even in these favourable applications it became evident that a reassay of the slag was generally advisable. It is a surprising fact that the procedural texts dealing with fire assaying seldom direct the reassay of slags, with the obvious inference that a single extraction by the fused lead is sufficient to extract the noble metals quantitatively.
The ore was dry ground and sieved. The 74 µm fraction was blended and bottled in 200g units. The stock was sampled systematically and analysed by fire assay/gravimetry (FA/G) and fire assay/ atomic absorption spectometry (FA/AAS) procedures to demonstrate sufficient homogeneity of gold for application as a compositional reference material.
slag that is liquid at the fusion temperature. The liberated precious metals are scavenged by the molten lead and gravitate to the bottom of the fusion crucible. ... The assay will then have to be repeated using either a different flux composition or a lower fire assay charge weight.
The fire assay method of determining the amount of precious metal in a rock was developed in ancient times (Haffty, J.; Riley, ; Goss,, ... be collected by the lead and the other parts of the rock can be made into a readily separating glass slag. The standard flux to be added depends on the type of rock, but generally is defined by ...
This invention relates to a novel fire assay flux composition including, inter alia, a dispersant in the form of a source of phosphate; a primary reductant in the form of iron powder comprising particles having a particle size of 60 mesh and finer, at least one basic flux and at least one acidic flux. The fire assay flux composition is useful for the fire assay analysis of Platinum Group ...
As obtained in the fire assay, it is usually an arsenide of iron approaching the composition of Fe 5 As. Occasionally the iron may be replaced by nickel or cobalt. The antimony ... if matte and speiss are absent — as should be the case in an assay fusion — the slag rests directly upon the lead.
Oct 20, 2009· The Department highly recommends analysis of samples by the fire assay method to determine precious metal content. Fire assaying, in use for thousands of years, still stands the test of time. ... from the slag are included. ... composition of the bead should now be gold and silver. The bead is weighed in a type of scale
Full text of "A Manual of Assaying: The Fire Assay of Gold, Silver, and Lead, Including Amalgamation and ..." See other formats ...
The classical fire assay technique allows the use of large portions of up to 50 to 100g sample that is representative which is a substantial benefit over other analytical methods. (Suominen et al,2004) Fire assay is usually named after the collector used and the main types of .
Borax (Na 2 B 4 0 7) is almost always present in all Fire Assay fluxes because it greatly reduces the fusing point of all slags, and it is also an excellent solvent for metallic oxides.. At red heat anhydrous borax becomes a strong acid and practically dissolves all metallic oxides and fluxes, both acid and basic. If too much borax is used in the assay of siliceous ores there results a very ...
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