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roasting of arsenical ores

Process for treating refractory gold ores by roasting .

Process for treating refractory gold ores by roasting .

Process for treating refractory gold ores by roasting under oxidizing conditions Article in Minerals and Metallurgical Processing 17(1):1-6 · February 2000 with 939 Reads How we measure 'reads'

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US3034884A - Reduction roasting of iron ores - Google Patents

US3034884A - Reduction roasting of iron ores - Google Patents

US3034884A US797005A US79700559A US3034884A US 3034884 A US3034884 A US 3034884A US 797005 A US797005 A US 797005A US 79700559 A US79700559 A US 79700559A US 3034884 A US3034884 A US 3034884A Authority US United States Prior art keywords furnace ore dust fines zone Prior art date 1958-03-14 Legal status (The legal status is an assumption and is not a legal conclusion.

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Roasting (metallurgy) - Wikipedia

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 has already been partially purified, e.g. by froth flotation.

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How to Remove Arsenic, Antimony & Bismuth from Copper

How to Remove Arsenic, Antimony & Bismuth from Copper

The roasting of copper-ores preparatory to smelting is always incomplete. Arsenic, antimony and bismuth may remain in the roasted product in the same combinations in which they occurred in the ores, accompanying the fixed compounds that are formed during the operation.

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Arsenical bronze - Wikipedia

Arsenical bronze - Wikipedia

Arsenical bronze is an alloy in which arsenic, as opposed to or in addition to tin or other constituent metals, is added to copper to make bronze.The use of arsenic with copper, either as the secondary constituent or with another component such as tin, results in a stronger final product and better casting behavior.. Copper ore is often naturally contaminated with arsenic; hence, the term .

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Process for treating refractory gold ores by roasting .

Process for treating refractory gold ores by roasting .

The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after roasting pretreatment was studied.

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Treatment of Refractory Gold Ores | SpringerLink

Treatment of Refractory Gold Ores | SpringerLink

Mrkusic, P. G., and J. E. Laschinger. 1967. Refractory gold ores—report on investigations into roasting of gold concentrates in the Edwards roaster of the Fairview and the New Consort reduction plants. Nat. Inst. of Metallurgy, Report No. 211, Johannesburg. Google Scholar

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US2650159A - Treating arsenical gold ores - Google Patents

US2650159A - Treating arsenical gold ores - Google Patents

US2650159A US128962A US12896249A US2650159A US 2650159 A US2650159 A US 2650159A US 128962 A US128962 A US 128962A US 12896249 A US12896249 A US 12896249A US 2650159 A US2650159 A US 2650159A Authority US United States Prior art keywords solids bed zone free gold Prior art date 1949-11-23 Legal status (The legal status is an assumption and is not a legal conclusion.

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Use roasting in a sentence | roasting sentence examples

Use roasting in a sentence | roasting sentence examples

The roasting is most simply effected by spreading it on heated slabs, on which it is constantly turned, or a roasting machine is used, consisting of a revolving drum in which the tobacco is rotated, gradually passing from one end to the other, and all the time under the influence of a current of heated air.

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Smelting - Wikipedia

Smelting - Wikipedia

Smelting is a process of applying heat to ore in order to extract a base metal.It is a form of extractive metallurgy.It is used to extract many metals from their ores, including silver, iron, copper, and other base metals.Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gases or slag and leaving the metal base behind.

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Arsenic - Wikipedia

Arsenic - Wikipedia

Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal.Arsenic is a metalloid.It has various allotropes, but only the gray form, which has a .

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Arsenic - Wikipedia

Arsenic - Wikipedia

Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal.Arsenic is a metalloid.It has various allotropes, but only the gray form, which has a .

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Inorganic arsenic poisoning | Article about inorganic .

Inorganic arsenic poisoning | Article about inorganic .

When it is prepared commercially from sulfide ores, e.g., arsenical pyrites, the ores are roasted (heated in the absence of air); the arsenic sublimes (passes directly from the solid to the gaseous state) and is condensed. In another method, white arsenic is reduced with carbon.

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US5254320A - Method for roasting sulphide ores - Google .

US5254320A - Method for roasting sulphide ores - Google .

A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. 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 material--such as calcium hydroxide--is mixed into the cooling water .

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gold ore gold ores

gold ore gold ores

Gold Ore Roasting Techniques. A more recent paper, Roasting of Arsenical Gold Ores and Concentrates by F. R. Archibald contains a bibliography listing 23 references on the subject of roasting gold and silver ores. There are four general types of roasting furnace in use the horizontal, multiple spindle type, of which the Edwards furnace and .

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Smelting - Wikipedia

Smelting - Wikipedia

Smelting is a process of applying heat to ore in order to extract a base metal.It is a form of extractive metallurgy.It is used to extract many metals from their ores, including silver, iron, copper, and other base metals.Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gases or slag and leaving the metal base behind.

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Mineralogical characteristics and treatment of refractory .

Mineralogical characteristics and treatment of refractory .

In addition, for the treatment of arsenical ores and concentrates, the method must cope with the environmental restrictions for the safe handling and disposal of arsenic containing effluents and products. Roasting and pressure oxidation have found industrial application, while most of the other processes are still in the development stage.

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Pyrolysis of arsenopyrite for gold recovery by cyanidation .

Pyrolysis of arsenopyrite for gold recovery by cyanidation .

Pyrolysis of arsenopyrite for gold recovery by cyanidation Pyrolysis of arsenopyrite for gold recovery by cyanidation Dunn, J.G.; Ibrado, A.S.; Graham, J. 1995-04-01 00:00:00 Gold in arsenopyrite or high-arsenic pyrites commonly exists as submicroscopic or "invisible" inclusions, making it refractory to cyanide leaching. Current practice favour an oxidising roast to liberate the gold for .

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Arsenic Removal from Arsenopyrite-Bearing Iron Ore and .

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and .

Arsenic can be removed from arsenic-bearing ore by a roasting or sintering method due to the volatile nature of arsenic and its compounds []; thus, some scholars have explored the appropriate arsenic removal conditions by performing roasting or sintering experiments.Yin et al. and Lu et al. studied arsenic removal from copper–silver ore using a roasting method [13,14], and the impact of .

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Full text of

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

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EXTRACTION OF SILVER Metallurgy, E.L. Rhead London 1895 .

EXTRACTION OF SILVER Metallurgy, E.L. Rhead London 1895 .

and small quantities occur in iron pyrites and mispickel (arsenical iron pyrites). The production of silver from these sources is nearly one-half of the total extracted. Extraction Processes. The high price of silver permits of poor ores being treated and the adoption of more costly . The roasted ore is next put into barrels capable of .

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Roasting Arsenic & Antimony Ores

Roasting Arsenic & Antimony Ores

The difficulty of roasting arsenical and antimonial ores may be avoided by taking ore, 1 A.T. ; red lead, 1,000 grains; sodium carbonate, 500 grains; potassium ferrocyanide, 550 grains, with a cover of salt or borax. The button is scorified, together with the matte formed, before cupellation. E. A. Smith found this method unsatisfactory and recommends the oxidation of sulphide of antimony by .

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(PDF) Conditions and Design Considerations for Maximising .

(PDF) Conditions and Design Considerations for Maximising .

from oxidation during roasting of arsenical ores present a 1. Principal Engineer– Process, T enova Mining and Minerals (Australia) Pty Lt d, 2/93 Francisco Street, Belmont WA 6104.

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Roasting Arsenical Gold Ores ·and Concentrates

Roasting Arsenical Gold Ores ·and Concentrates

roasting, special problems may arise. The present discussion is limited to arsenical and sulphide ores con­ centrates, complicated only by the more usual silicate and carbonate gangue components. Informative studies on the refrac­ tory nature of arsenical ores and compounds carrying gold values were reported by Leaver and Woolf

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Inorganic arsenic poisoning | Article about inorganic .

Inorganic arsenic poisoning | Article about inorganic .

When it is prepared commercially from sulfide ores, e.g., arsenical pyrites, the ores are roasted (heated in the absence of air); the arsenic sublimes (passes directly from the solid to the gaseous state) and is condensed. In another method, white arsenic is reduced with carbon.

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

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

A moderately low grade of the bulk ore and the additional processing costs involved in whole ore treatment processes are most certainly not economically viable and therefore not being considered . A significant proportion of the sulfidic refractory gold appears to be hosted by the arsenical pyrite, arsenopyrite and stibnite components of the ore.

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The Effect of Ore Roasting on Arsenic Oxidation State and .

The Effect of Ore Roasting on Arsenic Oxidation State and .

For example, ore roasting is an oxidative pretreatment step that is used to improve gold recovery from refractory arsenopyrite (FeAsS) ores by roasting in the presence of an oxidizing gas, which .

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Process mineralogy of roasted pyrite and arsenopyrite .

Process mineralogy of roasted pyrite and arsenopyrite .

Process mineralogical techniques can provide useful information on the mineralogy and textures shown by pyrite and arsenopyrite particles that have been roasted to enhance extraction of gold from refractory gold ores. Dark-field reflected-light microscopy has been found to especially reveal the extent of development of porosity and permeability in the roasted particles. X-ray diffraction has .

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Solid-phase speciation and post-depositional mobility of .

Solid-phase speciation and post-depositional mobility of .

Arsenic (As) concentrations in lake sediments in the Yellowknife region, Northwest Territories, Canada, are elevated from the weathering of mineralized bedrock and/or from the aerial deposition of arsenic trioxide (As 2 O 3) generated via the roasting of arsenical gold ores at the now-defunct Giant Mine and other historical roasting operations in the area.

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Treatment of Refractory Gold Ores | SpringerLink

Treatment of Refractory Gold Ores | SpringerLink

Mrkusic, P. G., and J. E. Laschinger. 1967. Refractory gold ores—report on investigations into roasting of gold concentrates in the Edwards roaster of the Fairview and the New Consort reduction plants. Nat. Inst. of Metallurgy, Report No. 211, Johannesburg. Google Scholar

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