Crushing & Grinding Machines

The Smelting of Sulfide Ores of Copper in Preconquest Peru

The smelting of sulfide ores of copper is rela-tively more complicated but still entirely possi-ble with the rudimentary means available to the preconquest workers The first step whether the ore be a simple or a mixed sulfide is to set out a pile of crushed ore mixed with charcoal fuel light it and roast off the sulfur in the open air...

The effecT of Iron And o IdI Ing flu AddITIon on The fIre

the original ore sampl The second experiment set was conducted to understand the influence of additional iron on the direct fire assay of ore samples instead of applying roasting After ore sample was dried at 105 176 C for 120 minutes mixtures were prepared containing 50 g of the raw ore and a constant quantity of flux materials...

CA2344129A1

A method of assaying and/or recovering at least one precious metal from an ore concentrate or slag containing metal oxide includes mixing crushed ore concentrate or slag with aluminum and lime and heating the mixture to initiate an aluminothermic reaction at a temperature above its melting point to reduce the metal oxide and produce a metal alloy containing the metal and the precious metal...

Specific ores commodities ALS

Samples are analysed by XRF following a lithium borate fusion with the addition of strong oxidising agents to decompose sulfide-rich or Other elements are available to report on request LOI may be optionally added to this method but it is not used to normalise results Pricing codes Fee Schedule CAD - USD - EUR - AUD p 39...

Molecules Free Full

Lead fire assay Pb-FA and nickel sulfide fire assay NiS-FA are widely used FA methods Pb-FA utilized for the collection of Au Pt Pd and Rh is the application of metallurgy in analysis A simple Pb-FA method has been developed in 1994 for the determination of ultra-low Au Pt and Pd contents in rocks by Hall et al 38 its limit of...

roasting of sulphide materials

04102014 Often before roasting the ore has already been partially purified eg by froth floatation The concentrate is mixed with other materials to facilitate the process This process is generally applied to sulphide minerals During roasting the sulfide is converted to an oxide and sulfur is released as sulfur dioxide a gas 5...

Smelting Tips

Roasting sulfide ore prior to smelting is absolutely necessary Sulfides not thoroughly roasted will steam and spit and mess everything up when you go to smelt them the driving off of the sulfur causes acidic reactions in the smelting process raising heck with the crucible and the ph of the flux itself...

SMELTING SILVER

people call fluxes because they are added to ores not only for assaying but also for smelting Agricola p 232 All silver ores need to be fluxed for smelting6 In Pliny s day when almost all the ore smelted was high-grade the addition of lead or lead ore galena...

Spectrographic Analysis Reed Laboratories

Gold and Silver Assay on Telluride Minerals and Concentrate - Custom assay for removing Telluride interference prior to assay Pre-roast for raw minerals Lower Detection Limit 001 oz/ton 1 hour slow ramp to 1300F pre-roast plus extra flux a crucibe fire assay with X-Ray Spectrometer finish Minimum sample 100 grams 6500 25X...

sulfide ore alot of sulfide ore

Sep 16 2012 0183 32 Concentrate it and then roast the concentrate before any attempt at leaching I would love to see that Red Ore Could you post a photo That red ore could be a very high grade Gold Ore That stuff can assay as high as 30 oz per ton For that matter I would like to have a chicken egg size sample to look at and put on my Ore Shelf as a specimen...

THERMAL BEHAVIOR AND KINETICS OF SULFIDE

the ore temperature reaching the auto-ignition point 1-3 Sulfide concentrate is the term of selected metal sulfide ore which is a higher-grade powdery substance obtained by separating undesired components from sulfide metal ore such as iron sulfide copper sulfide lead sulfide and zinc sulfide...

Establishing thE ProcEss MinEralogy of gold orEs

Silver-rich ores and copper sulfide ores Silver-rich ores and copper sulfide ores are often free-milling but when the silver grade is high gt 10 g/t and/or the gold is present as electrum the processing may need to be modified The greater reactivity of silver SGS MINERALS TECHNICAL BULLETIN 2004-03...

Fire Assay Procedure

Preparation of Assay Flux for Sulfide Or STEP 1 If you have litharge add 25 lbs to the pail of flux This would be the simplest way to use your flux STEP 2 You can now follow the standard steps for assaying sulfide or Preparation of Assay Flux if you are using Lead Weights Powdered Lead Shot or Shavings STEP 1...

Small Scale Treatment of PM Sulfide Ores

Feb 15 2020 0183 32 The ore has a 5 to 10 percent sulfide content so I expect about 10 to 20 pounds of sulfide concentrate Dealing with 10 to 20 pounds is a lot easier than 200 pounds There will be some loss of values in this operation - but I accept this because although the method is less than optimal it s the best I can put together...

Smelting tips for the Mocrowave Gold Kiln GPK

Again stay the heck out of the fumes and smoke not good Roasting sulfide ore prior to smelting is absolutely necessary If not done the driving off of the sulfur causes acidic reactions in the smelting process raising heck with the crucible and the ph of the flux itself In a standard gravimetric fire assay the lab will place 2917...

ISO 10378 2005 en Copper lead and zinc sulfide

S hepard OC and D ietrich WF Fire Assaying New York McGraw-Hill Inc 1940 3 S mith EA The Sampling and Assay of Precious Metals Charles Griffen 1977 4 H affty J R iley LB and G oss WD A Manual on Fire Assaying and Determination of the Noble Metals in Geological Materials United States Geological Survey Bulletin...

Enhancement of gold recovery during lead fire assay by

It was found that for the sulfide ore samples the recoveries of Au and Pd are sometimes lower by nickel sulfide fire assay than by lead fire assay Recovery of Re by nickel sulfide fire assay was...

Comparison of Recoveries by Lead Fire Assay and Nickel

We compared the recovery of gold palladium and platinum by two fire assaying procedures using nickel sulfide and lead as collectors The presence of appreciable amounts of sulfide minerals in the sample caused interferences in both procedur An...

Recovery of Gold in Pyritic Sulfide Ores

Recovery of Gold in Pyritic Sulfide Ores If the assay is 2 ounces per ton there are generally larger gold particles present along with the typically fine micron sized gold When the grade diminishes to say 02 ounces per ton there are generally only micron sized particles associated with the pyrites in the ore Roasting has to be one...

US5074910A

The present invention is a process to recover precious metals from sulfide or It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt The salt preferably contains potassium chloride This chlorination is carried out at a temperature between 300 176 and 600 176 C while stirring The process converts precious metals in the elemental and sulfide forms into...

Processes Free Full

In this study oxidizing roasting segregation roasting and magnetic separation are used to extract cobalt and iron from refractory Co-bearing sulfur concentrate The Co-bearing sulfur concentrate containing 068 Co 3326 Fe and 3658 S was obtained from V-Ti magnetite in the Panxi area of China by flotation Cobalt pyrite and linneite were the Co-bearing minerals and the gangue...

PDF Gold Extraction and Recovery Processes For Internal

Mining To define the ore from the waste rock samples are taken at set intervals along surveyed lines within the pit These samples are assayed Assay results are used to mark out areas of ore and waste rock which are mined separately Some of the harder areas require blasting to loosen the rock prior to excavation by hydraulic diggers...

Removal of scorodite arsenic from gold ore in the form of

Nov 24 2020 0183 32 Thus it was found that during the test the decrease in the mass of the sample upon sulfide roasting from the ore without considering the sulfidation and reducing agent was 916 The gold content in the cinder was 645 g/t and arsenic was 031...

Recovery of Silver Gold and Lead From a Complex Sulfide

minerals in complex ores but as with caustic cyanide gold and silver extrac 173 tion is usually low with complex sulfide gold-silver or A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 6 Considera 173 ble work was completed by-Wong 7 to re 173 cover lead from a galena concentrate with...

Ore Dressing and fire assaying Flashcards Quizlet

Ore Dressing and fire assaying STUDY PLAY Grams of metal in product / 100 gram feed Calculated head refers to ratio of the water to solids by weight Pulp density is the 602 x 1023 Avogadro s number is the number of atoms in one gram atom which is gravimetric...

Assaying Gold and Silver Ores Fire Assaying and Other

While improper fire assay methods or incorrect fluxes can cause problems when properly done a fire assay is extremely reliable method of determining the gold and silver content of an ore sample The details of how to do a fire assay correctly and the proper fluxes and how they are made have been written about and published in many books...

Barry Wills Blog Controversial invisible gold paper

Aug 12 2013 0183 32 Fire assaying the same head ore will show at the best a trace We followed up with several more of these roasts that used up the entire 15 five gallon buckets of ore samples with the same results We wanted to run more test but had to wait for spring to get to the mine site to get more sampl...

Comparison of Recoveries by Lead Fire Assay and Nickel

Jun 22 2007 0183 32 It was found that for the sulfide ore samples the recoveries of Au and Pd are sometimes lower by nickel sulfide fire assay than by lead fire assay Recovery of Re by nickel sulfide fire assay was found to be low the average recovery of five repeated analyses of the reference sample NIST SRM 330 was 9 with a relative standard deviation of 48...

Smelting and Roasting Ores to recover gold silver and

However this burning or roasting of the sulfide ores does work well to convert rebellious ores into a more free milling state allowing the values to be extracted Exact temperatures used in roasting vary and excessive temperatures can cause problems including melting the sulfides before they can oxidize...

Full text of Roasting of gold and silver ores and the

Full text of Roasting of gold and silver ores and the extraction of their respective metals without quicksilver See other formats...