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Recovery of Gold in Pyritic Sulfide Ores

Recovery of gold in sulfide ores has fallen into several categories First is froth flotation and second is cyanidation of the ores Using cyanide to recover gold from sulfide ores generally results in 30 to 35 recovery and the best I have heard of is around 50 recovery.

Sulfides Selenides and Tellurides rebellious and

Many sulfide minerals also contain things like copper or antimony that can react with the cyanide preventing the cyanide from leaching out the gold and silver For information on methods to deal with and extract gold silver and base metals from these refractory ores I recommend two pages on this website.

BACTERIAL LEACHING AS A PRE TREATMENT STEP FOR GOLD

sulphide concentrates is shown in Figure 1 The key components of the process involve concentration of a ground ore usually by flotation followed by oxidation of the gold bearing sulphides to the required extent in a multi stage process Oxidized solids discharged from the last reactor are separated from the bio leachate washed and

Optimized roasting of complex copper sulphide concentrates

01 04 2019  Purpose and goal The overall objective of the project is to optimize the roasting of sulphide concentrates for copper extraction to achieve efficient removal of elements as arsenic As and antimony Sb for a flexible use of different concentrates.

Gold Recovery 101

Typically this concentrate contains a mixture of gold along with other valuable elements found in sulfide minerals such as copper lead zinc etc If the gold is encapsulated in sulfides oxidation of the sulfide minerals by roasting pressure oxidation or bio oxidation can be

Microwave absorption and roasting characteristics of zinc

21 08 2021  A novel microwave roasting technology for formation of ZnO from zinc sulfide concentrate is presented The dielectric properties and thermal behaviors of zinc sulfide concentrate and ZnS CaO MgO ZnO FeS and ZnFe 2 O 4 covering a temperature range of 25 to 1000°C at 2.45 GHz are systematically investigated.

Effect of Roasting Temperature for Copper Leaching of

This study was undertaken to develop a cost effective method of copper leaching in sulfide concentrate involving minerals as chalcopyrite and pyrite The combined methods involving low temperature roasting of sulfide copper minerals with potassium chlorides without the formation of sulfurous gases and their evolution into the atmosphere is suggested.

Simultaneous sulfide oxidation and gold dissolution by

Simultaneous sulfide oxidation and gold dissolution by cyanide free leaching from refractory Roasting is the most common refractory gold ore pre treatment method It has been in industrial use already for over 70 The gold concentrate contained graphite as a preg

The effect of ore roasting on arsenic oxidation state and

objective was decomposition of the sulphide that interfered with the subsequent chemical extraction of the gold By the mid 1900s mechanically rabbled hearth roasters often referred to as the Edwards roaster were employed in the roasting of refractory gold concentrates Gossman 1987 with the objective of produc

ALTA Gold 2012 E Doc

reduced in the concentrates which will reduce acid consumption issues for oxidative pretreatment processes Flotation test work on high throughput Ore B indicated that gold can also be concentrated to an extent by concentrating the sulphide component in the ore to mass pulls of 15 to 30 wt with gold recovery of 60 to 70 .

calcination gold sulfide ore

22 08 2018 In this video we show the process of smelting down sulfide rich gold concentrates to end up with a gold button Through roasting the sulfur is driven off Guides For High sulfide Gold Processing High sulfide gold ore refers to a certain gold ore with 20 30 of gold wrapped by sulfide mainly pyrite .

Dielectric Properties of Zinc Sulfide Concentrate during

Zinc phase distribution of zinc sulfide concentrate Zinc Phase Zinc Sulfide Zinc Carbonate Zinc Silicate Franklinite et al ZnT Mass fraction/ 49.55 0.80 0.64 0.17 51.16 Distribution/ 96.85 1.56 1.25 0.33 100 Figure 1 XRD pattern of zinc sulfide concentrate The zinc sulfide concentrate sample was prepared by a dry grinding and a wet

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore Cyanide leaching of the concentrate was performed at 20 w/w of solid 500 gram of refractory sulfide gold ore concentrate in a 2.5 liter glass reactor with aeration and stirred at 250 rpm.

Sulfatizing roasting for copper and cobalt production

Keywords roasting sulfidic concentrates copper ores has developed roasting solutions for copper gold zinc lead molybdenum and pyrite ores Table 2 is an example for a plant that treats concentrate A Copper sulfide is converted by

MINERAL PROCESSING Outotec offers partial roasting

04 01 2012  FINLANDOutotec has developed a two stage partial roasting process to remove impurities such as arsenic antimony and carbon from copper and gold concentrates as a pre treatment to actual extraction processes The process is being installed at Codelco s Mina Ministro Hales mine in Chile where it will remove more than 90 of the arsenic in concentrate.

Optimized roasting of complex copper sulphide concentrates

Optimized roasting of complex copper sulphide concentrates for flexible raw material utilization Project leader Caisa Samuelsson Luleå University of Technology LTU Partners Boliden Mineral AB Semtech Metallurgy AB LTU Project duration 2019 04 012022 03 31

Simultaneous sulfide oxidation and gold dissolution by

15 08 2021  Pyrite and arsenopyrite are known to be the most common gold bearing sulfide minerals in refractory gold ores Traditionally these minerals have been first oxidized by roasting acidic pressure oxidation or bio oxidation to release gold after which the gold is dissolved in the subsequent cyanide leaching step.

TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD

disseminated gold Gold in such ores is often associated with sulphide minerals and locked in so called sulphide capsula since it is closed inside dense sulphide grains and inaccessible to recovery by cyanidation To treat refractory sulphide concentrates containing gold a number of processes were

Fluidized bed roasting of zinc sulfide concentrate

Fluidized bed roasting of zinc sulfide concentrate factors affecting the particle size distribution Constantineau Jean Pierre Abstract An experimental programme was established to study the effect of process parameters on the agglomeration behaviour of particles within a fluidized bed zinc concentrate roaster.

FLASH ROASTING OF SULPHIDE CONCENTRATES AND LEACH

sulphide as a feed to a zinc roaster These finer concentrates are more difficult to process in conventional roasters Experience in processing sulphides Cu Ni and inorganic precipitates with the TORBED reactor suggests that there are inherent advantages for fine powder <50˜m processing TORBED reactor application to sulphide roasting has

Gold Recovery And How To Choose The Right Process

Gold deposits can be grouped into two primary classes placer deposits where the gold is exposed from weathering and erosion and hard rock where the gold is still trapped within the host rock Gold recovery methods for these two types of deposits vary greatly from simple panning to a complex network of grinding chemical leaching gravity concentration and more.

Metallurgy concentration roasting smelting

Metallurgy concentration roasting smelting Roasting It is a process wherein the ore is heated either alone or with some other material in excess of air below the fusion point of the ore Usually this method is used for sulphide ores In roasting definite chemical changes take place to form oxide or chloride of the metal.

Corvus Gold Receives Sulfide Gold Recovery of 90 Using

known sulfide mineralization on the North Bullfrog property The test work conducted standard flotation concentration of the sulfide material which produced a high quality concentrate that averaged 92 gold in just 12 of the original materials 9 1 concentration ratio for the Sierra Blanca rock unit.

ALACER GOLD TO PURSUE POX AS SULFIDE ORE PROCESSING METHOD

ore POX and two‐stage roasting have similar capital and operating costs roasting however oxidizes less of the sulfide minerals which leads to lower gold recoveries as compared to POX Bench scale testing of whole ore two‐ stage roasting initially yielded 70 to 75 recovery rates.

Procedure for processing sulphide gold containing arsenic

The task is solved in that in the method for processing sulfide gold arsenic antimony concentrates and ores including rihtovanie roasting condensation of gaseous compounds of antimony and arsenic gold leaching of the calcine according to the invention the mixture is prepared by mixing the concentrate or ore and chloride and/or ammonium fluoride at a mass

Leaching of a gold bearing partially roasted sulphide

In this gold sulphide concentrate three main reasons explain most of the variability response found at leaching tests i gold exists as free and non free particles with sizes of <10 mm to >100 mm ii the product has completely roasted particles as well as partially and almost intact sulphides particles and ii the granulometric composition of the samples is quite different and gold

Copper processing

26 09 2021  Roasting smelting and converting Once a concentrate has been produced containing copper and other metals of value such as gold and silver the next step is to remove impurity elements In older processes the concentrate containing between 5 and 10 percent water is first roasted in a cylindrical refractory lined furnace of either the hearth or fluidized

Study of Zinc Sulfide Concentrates by DTA TGA and X Ray

11 06 2013  Bulgaria is a major producer of zinc in the Balkans about 100 000 tons per year The two zinc plants KCM S.A Plovdiv and LZC S.A Kardzhali deliver the necessary raw materials from Bulgaria and abroad But the zinc production at LZC Kardzhali for nearly a year has stopped Turkey is a main producer of zinc sulfide concentrates from the Balkan countries.

New Partial Roasting Process Purifies Contaminated

30 12 2011  The roasting process for refractory gold concentrates contaminated with arsenic and carbon is a two stage process Arsenic is removed in the first roasting stage while carbon and remaining sulfur are removed in the second stage All sulphur iron and carbon are fully oxidized in the process and calcine suitable for actual gold leaching is produced.

ConRoast

Roasting of sulphide concentrates has been practised for centuries Oxidative roasting of pyrite FeS 2 is a standard way of producing sulphuric acid In many base metals plants roasting is used on an industrial scale e.g for the production of zinc copper and nickel even tin molybdenum and antimony.

AN INVESTIGATION INTO THE SULPHATION ROASTING OF

sulphide mineral are being considered for development The processing of high arsenic copper concentrates directly in copper smelters is difficult due to environmental concerns This thesis investigates a process using sulphation roasting as an alternative

Fluidized bed roasting of zinc sulfide concentrate

Fluidized bed roasting of zinc sulfide concentrate factors affecting the particle size distribution Constantineau Jean Pierre Abstract An experimental programme was established to study the effect of process parameters on the agglomeration behaviour of particles within a fluidized bed zinc concentrate roaster.

Gold Two Stage Roasting

Our two stage roasting plants are mainly used for treating double refractory gold concentrates A two stage roasting process combines partial roasting in the first stage with dead roasting in the second stage The first stage is used as a de arsenifying process step in an oxygen deficient roasting atmosphere while the second stage operates in