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  • The influence of roasting temperature upon gold recovery from a ...

    Mar 14, 2012 ... OBJECT OF INVESTIGATION P y r i t i c and arsenical ores containing submicroscopic gold have long been regarded as refractory requiring s p e c i a l treatment to free the gold for s o l u t i o n by cyanide. The sulphides are usually roasted to free the gold and the calcines cyanided. This investigation was...

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  • Microwave Heating Applications in Mineral Processing - InTechOpen

    oxides and sulfides using a resonant cavity operating at 2.45 GHz and variable power up to. 1.6 kW (Ford and Pei, 1967)17. ..... Nanthakumar et al., 200756, investigated microwave roasting of a double refractory gold ore .... conducted reduction tests on identical sample mixtures of hematite ore fines, coke and lime powder.

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  • Gold & Silver - Department of Energy

    Energy and Environmental Profile of the U.S. Department of Energy. 7 Gold & Silver. Gold has played a prominent role in world economic and political events. Most of .... Roasting of sulfide ores involves heating the ores in air to convert them to oxide ores and ..... Lime is added and a high lead content slag is formed which.

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  • Roasting in Metallurgy

    Mar 18, 2017 ... Chemistry of Oxidising Roasting. Iron Pyrites, FeS2. Roasting Copper Pyrites. Galena, PbS – Roasting; Roasting Arsenical Pyrites, FeAsS; Antimonial Sulphide Roasting; Blende, ZnS Roasting; Carbonate of Lime, CaCO3; Tellurides Roasting; Metallic Gold, Silver Roasting. Roasting to Eliminate Arsenic...

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  • OUTOTEC ROASTING SOLUTIONS

    We offer roasting solutions for zinc, copper, pyrite, gold, and precious ... followed by neutralization using lime milk, and is based on easy and robust .... Gold roaster. Sulfating roasting. (exothermic ). BFB. Transformation of metal sulfides into metal sulfates. Temp: 650–750 °C. Oxygen: ~ 6 vol%. MeS-like. Cu/Co-sulfide.

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  • The lime-concentrate-pellet roast process for treating copper sulfide ...

    The lime-concentrate-pellet roast process for treating copper sulfide concentrates by R. W. Bartlett and H. H. Haung. THE LIME- concentrate-pellet-roast proc- ess (LCPR) developed in the ... copper sulfide flotation concentrates to cath- ode copper while meeting ... leached to recover gold and silver. WATER. (OPTIONAL).

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  • Alkaline Oxidative Leaching of Gold-Bearing ... - CDC stacks

    Sep 5, 1989 ... 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching a low-grade gold ore and a bulk sulfide flotation concentrate prepared from it. Cyanidation of the leach residues resulted in 70 pct Au and 31 pct Ag extraction. The NaOH leachate was partially regenerated.

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  • Sulphide Gold Ore Treatment by Leaching and Flotation Process

    Mar 17, 2017 ... It also provided the means of working ore bodies hitherto considered unprofitable or metallurgically impossible for cyanide treatment. Two examples are the large low-grade ore bodies which require very fine grinding and refractory sulphides which have to be concentrated and roasted to expose gold to...

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  • Gold Ore Roasting Techniques - 911 Metallurgist

    Mar 17, 2017 ... Recover Gold by Roasting Pyrite Ore. The roasting of straight pyritic ores involves the conversion of the iron sulphides to the oxide under oxidizing conditions with the evolution of sulphur dioxide and, to some extent by catalytic action, sulphur trioxide gas also. In this chemical change the iron mineral is...

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  • Gold Mining Process Development – Denver Mineral Engineers

    Man has held a fascination with recovering and acquiring gold almost since the beginning of time. This paper ... Bioleaching; Autoclaving (pressure oxidation); Roasting; Clorination; Pre-oxidation; Lime/caustic pretreatment. Today, cyanide ... particularly effective when gold is associated with sulfide minerals such as pyrites.

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  • What are the main factors that lead to high cyanide ... - ResearchGate

    Get expert answers to your questions in Consumption, Mineral Processing, Leaching and Gold and more on ResearchGate, the professional network for scientists. ... Normally in coarse particle size range; cyanide and lime consumption could be reduced; but it should be checked for your case. Also please clarify amount of...

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  • A FUNDAMENTAL INVESTIGATION OF THE HIGH TEMPERATURE ...

    As the dollar value per ounce of gold has hit a downward trend in the last few years, there is more pressure within a gold operation to reach the highest percent recovery, no matter what kind of ore is presented for treatment. For double refractory gold ores, the most crucial unit operation is performed by the roaster by creating...

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  • Improved recovery of a low-grade refractory gold ore using flotation ...

    To improve the recovery of low-grade refractory gold ores, flotation should be followed by roasting, biological, or pressure oxidation processes so that the gold could be liberated ... In sulfidic refractory gold ores, fine gold particles may be highly disseminated and locked up in sulfide minerals such as pyrite and arsenopyrite.

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  • A Review of Thiosulfate Leaching of Gold: Focus on ... - MDPI

    Jun 15, 2017 ... implemented after chloridizing roasting. In the initial stage of ..... oxidized sulfide gold concentration and negligible thiosulfate consumption can be achieved with low concentrations of .... between the elemental sulfur, oxygen, and lime at 70–75 ◦C and PO2 0.3–0.5 MPa, and at the second step these two...

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  • Gold Ore Roasting Techniques - 911 Metallurgist

    Mar 17, 2017 ... Recover Gold by Roasting Pyrite Ore. The roasting of straight pyritic ores involves the conversion of the iron sulphides to the oxide under oxidizing conditions with the evolution of sulphur dioxide and, to some extent by catalytic action, sulphur trioxide gas also. In this chemical change the iron mineral is...

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  • Gold Ore Roasting Plant - 911 Metallurgist

    Mar 17, 2017 ... TYPICAL VERTICAL LIME SLAKING MILL; PRINCIPLE OF OPERATION TYPICAL VERTICAL LIME SLAKING MILL; HIGH-CAPACITY THICKENER ... Why Roast? Some gold ore at the Roaster is double refractory. First, the gold is locked in sulfide mineral particles that must be oxidized to expose the gold...

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  • Trona-Sodium Sesquicarbonate - solvay.us

    Laboratory roasting tests confirmed that the effectiveness of trona in roaster feed for SO2 fixation is greater than that with addition of lime or soda ash. In this publication, .... pit and underground ores from Carlin and gold/pyrite flotation concentrate from the ... ore deposit is low, averaging 0.8 % sulfide sulfur. The dominant...

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  • COMPARISON OF CYANIDE AND THIOSULPHATE ... - Doria

    sulfides. Many gold ores contain pyrrhotite which is easily oxidized and thereby consumes oxygen from leach solution. Besides copper minerals and pyrrhotite, other minerals that consume cyanide ... Roasting temperatures of 650˚C or over were required to convert the pyrite to hematite and ..... addition of lime (CaO).

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  • Patent US5254320 - Method for roasting sulphide ores - Google ...

    Oct 19, 1993 ... The ore and a sulphur-binding lime-containing material are supplied to a roasting furnace in which the ore is roasted with the emission of heat and sulphur dioxide. The lime-containing ... 650-750° C.). Roasted material is discharged from the furnace and acted upon to recover gold, silver and copper metal.

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  • The lime-concentrate-pellet roast process for treating copper sulfide ...

    The lime-concentrate-pellet roast process for treating copper sulfide concentrates by R. W. Bartlett and H. H. Haung. THE LIME- concentrate-pellet-roast proc- ess (LCPR) developed in the ... copper sulfide flotation concentrates to cath- ode copper while meeting ... leached to recover gold and silver. WATER. (OPTIONAL).

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  • Gold From Pyrites and Other Sulphides | NZETC

    A little hydrochloric acid added to some of the roast should not give off the well-known smell of sulphuretted hydrogen, showing the presence of sulphides, as these if present, would be acted upon in the subsequent process and precipitate the gold as sulphide at the wrong time. A practical test of roasting can easily be made...

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  • Alkaline Oxidative Leaching of Gold-Bearing ... - CDC stacks

    Sep 5, 1989 ... 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching a low-grade gold ore and a bulk sulfide flotation concentrate prepared from it. Cyanidation of the leach residues resulted in 70 pct Au and 31 pct Ag extraction. The NaOH leachate was partially regenerated.

    Get Quote
  • Basic Iron Sulphate in Pressure Oxidation Processing

    generally be broken down chemically, by oxidative processes such as roasting, pressure oxidation or bacterial ... sulphides ahead of a traditional gold ..... Lime consumed. Kg/t. 213. 18.9. Gold recovery was very similar in both tests, but silver recovery was slightly lower after hot curing. A loss in silver recovery during hot...

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  • economics of refractory gold ore processes - ACP Equipment

    This paper compares the relative economics of treating ores by oxygen pressure oxidation, roasting and bacterial oxidation with or without preconcentration by froth flotation. Capital and operating cost estimates for each method of pretreatment were prepared and these estimated costs and ore sulfide grades then are used...

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  • Non-Ferrous Mining and Metals | Lhoist - Minerals and lime producer

    Gold production. Gold ore beneficiation is commonly conducted by cyanide leaching. Gold oxide ores are naturally disposed to cyanide leaching, while gold sulfide ores need pre-treatment (roasting, autoclave). Cyanide leaching can be carried out in either heap or agitated systems. In both systems, lime is added to either...

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  • Roasting (metallurgy) - Wikipedia

    Roasting is a process of heating of sulphide ore to a high temperature in presence of air. It is a step of the processing of certain ores. More specifically, roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s). Often before roasting, the ore...

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  • Leaching of a gold bearing partially roasted sulphide. Laboratory ...

    Regarding the silver recovery, the NaCN and lime consumption are higher while using the products roasted at the lowest tested temperatures. .... In the partially roasted sulphides bearing ore, gold was observed by microscopy as particles whose size was in the 10 to 100 mm range, either as completely free or still inserted...

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  • Sulphide Gold Ore Treatment by Leaching and Flotation Process

    Mar 17, 2017 ... It also provided the means of working ore bodies hitherto considered unprofitable or metallurgically impossible for cyanide treatment. Two examples are the large low-grade ore bodies which require very fine grinding and refractory sulphides which have to be concentrated and roasted to expose gold to...

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  • Mine-to-mill optimisation: effect of feed size on mill ... - SRK Consulting

    gold-bearing, complex-sulfide ore feed and autoclave tailings from a mine on the Carlin trend in northern .... from copper sulfides, the pH should be no more than 11 to provide pyrite depression, and lime is added with a ... combining flotation with other methods. To recover gold from sulfide concentrates, roasting or oxidation.

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  • Processing technologies for gold-telluride ores - Semantic Scholar

    Abstract: Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials. ... ores. For the conventional cyanide leaching process, pretreatment such as oxidation is required to achieve high gold recovery. Roasting is a relatively simple but .... Lime was added to depress the.

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  • PYRITE ROASTING, AN ALTERNATIVE TO SULPHUR ... - SAIMM

    In some coutnries, pyrites and iron sulfide ores still constitute today, an important raw ... Pyrite (Gold). 1984. Almagrera, Spain. 1 x 725 t/d SFB. Pyrite. 1983. Siilinjärvi, Finland. 1 x 420 t/d SFB. Pyrite. Table 1: Outotec roasting technology for pyrite concentrate, latest plants .... Filter aid (diatomaceous earth) and lime are.

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  • 3.5" AP Green Roasting/Scorifier Dish, Melting Gold Silver Copper ...

    3.5" AP Green Roasting/Scorifier Dish, Melting Gold Silver Copper Ore Sulfides. Availability: In ... Lime- 0.2% Phosphorous Pentoxide- 0.1% Alkalis- 1.7%. Larger designed dishes are more prone to cracking so use caution when approaching higher temperatures and consider preheating to remove any residual moisture.

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  • ConRoast - Mintek

    The ConRoast process is based on the removal of sulphur by roasting, followed by smelting of the dead-roasted concentrate in a DC arc furnace, using an ...... palladium, and gold from Stillwater Complex flotation concentrate by a roasting-leaching procedure, Complex Sulfides – Processing of ores, concentrates and...

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  • roasting and reduction processes-a general ... - RSC Publishing

    of the gold obtained, and notable proportions of the platinum metals, are derived from deposits ... calcination and sulphides wholly or partly to oxides by roasting. Sulphides may also be partly converted to sulphates by roasting under carefully controlled ...... extremely low by reaction with lime to form a stable calcium silicate.

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  • Leaching of a gold bearing partially roasted sulphide. Laboratory ...

    Regarding the silver recovery, the NaCN and lime consumption are higher while using the products roasted at the lowest tested temperatures. .... In the partially roasted sulphides bearing ore, gold was observed by microscopy as particles whose size was in the 10 to 100 mm range, either as completely free or still inserted...

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  • Controlling SO2emissions in the roasting of gold concentrate ...

    Acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective for some ores. For such ... In an effort to develop a technique having lower SO2 emissions, a lime agglomeration roast (LAR) pretreatment process was investigated.

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  • Enhanced leachability of gold and silver in cyanide ... - CiteSeerX

    refractory nature of jarosite minerals present in the lead/sil- ver residue. Alkaline decomposition of the sample followed by cyanide leachin showed better recoveries of gold. (55.69%) silver (80.17%). Table 2. Pre-treatment of feed with lime and leach conditions. Conditions. Alkaline treatment. Cyanide leaching. Temperature...

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