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roasting of arsenical 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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Roasting Arsenical Gold Ores ·and Concentrates

Roasting Arsenical Gold Ores ·and Concentrates By F. R. ARCHIBALD* (Annual General Meeting, Montreal, Que., Ap1·il, 1949) INTRODUCTION IT IS the purpose of this _paper to review the subject of roasting as preparation of refractory gold ores and concentrates • for cyanidation, with particular reference to opera­

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The effect of ore roasting on arsenic oxidation state and

May 08, 2015· The two most common purposes for roasting of arsenical sul-phide ores are: (1) to improve the extraction of refractory gold; and (2) to remove As from copper ores prior to smelting. The earliest roasting technologies practiced in gold extraction were turn of the century (ca. 1900) hand-feeding and mixing (rabbling)

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Roasting Arsenical Gold Ores and Concentrates Arsenic Iron

Roasting Arsenical Gold Ores and Concentrates Free download as PDF File (.pdf), Text File (.txt) or read online for free. ok

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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 roasting Prior art date 1949-11-23 Legal status (The legal status is an assumption and is not a legal conclusion.

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Historical roasting of thallium- and arsenic-bearing

Jan 15, 2019· This gathers samples from brittle pyrite ores (Fig. 1c) originally used in the roasting process (RT16), an open-air pyrite roasting heap from the 19th century (RT2) and sediments and soil samples (RT3, RT4, and RT5) taken at 60, 90 and 250 m from the “telera” (RT2) along a small creek collecting surface acid water from this (Fig. 1b).

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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 roasting Prior art date 1949-11-23 Legal status (The legal status is an assumption and is not a legal conclusion.

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Roasting Arsenical Gold Ores and Concentrates Arsenic Iron

Roasting Arsenical Gold Ores and Concentrates Free download as PDF File (.pdf), Text File (.txt) or read online for free. ok

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Gold recovery from high-arsenic-containing ores at Newmont

The implementation of an “intelligent” process control system helped significantly in achieving steady low roasting temperatures, thus obtaining high gold recoveries of 92 to 93 percent. Under these conditions, several roasting campaigns with high-arsenic-containing ores were conducted, which resulted in a significant decrease in gold recovery.

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(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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Process for treating refractory gold ores by roasting

The common alternatives for the pretreatment of refractory ores are roasting, high or low-pressure oxidation, bacterial oxidation and chemical oxidation (Fernandez et al., 2000), but these

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AN EXAMINATION OF ARSENIC CONTAMINATION IN THE

arsenical gold ores usually involved high temperature roasting of the ore or concentrate, followed by conventional cyanidation and Merrill Crowe precipitation. Though there were several modifications and upgrades over the years, roasting was the practice followed at Giant throughout its history. ---

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Process for treating refractory gold ores by roasting

Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. 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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PYRITE ROASTING, AN ALTERNATIVE TO SULPHUR BURNING

The roasting of sulphide ores and concentrates is often the first step in the production of metals or chemicals. In many processes, the production of sulphuric acid is viewed as a Arsenic occurs in pyrites as arsenical pyrite (FeAsS; FeAs2*FeS2). Under the usual roasting conditions, with a slight excess of oxygen in relation to the

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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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US2867526A Method for removing arsenic from arsenopyrite

US2867526A US646064A US64606457A US2867526A US 2867526 A US2867526 A US 2867526A US 646064 A US646064 A US 646064A US 64606457 A US64606457 A US 64606457A US 2867526 A US2867526 A US 2867526A Authority US United States Prior art keywords arsenic gases treatment zone solids sulfur Prior art date 1957-03-14 Legal status (The legal status is an assumption and is not a

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Pyrite roasting, an alternative to J sulphur burning

The roasting of sulphide ores and concentrates is often the first step in the production of metals or chemicals. In many processes, the Arsenic occurs in pyrites as arsenical pyrite (FeAsS; FeAs2*FeS2). Under the usual roasting conditions, with a slight excess of oxygen in relation to the stoichiometric

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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

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Refractory gold ores in Archaean greenstones, Western

Many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling. The most common sulphide ore types can be sub-divided broadly into pyritic (pyrite±pyrrhotite) and arsenical types (pyrite+arsenopyrite±pyrrhotite). Arsenical ores vary from highly refractory to free-milling.

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