roasting of arsenical ores

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Pretreatment Process on Refractory Gold Ores with As

The problem of the refractory nature of gold bearing arsenide ores is described The basic principle, characteristics and application of pretreatment technique of arsenic-bearing gold ores are presented in ,...

Gold ore contain antimony - spirosurveycoza

Roasting Arsenic & Antimony Or The difficulty of roasting arsenical and antimonial ores may be avoided by taking ore, 1 AT ; red lead, 1,000 grains; sodium carbonate, 500 grains; potassium ferrocyanide, 550 grains, with a cover of salt or borax...

Process mineralogy of roasted pyrite and arsenopyrite ,

Abstract 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 or...

92 - Caveman Chemistry

This arsenical bronze, a solution or alloy of arsenic in copper, is much harder than copper alone, which makes it more useful for tools and weapons Tin also forms an alloy with copper, bronze, which is harder than either metal alone , In roasting, the ore is heated in an oxidizing atmosphere...

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...

Pyrolysis of arsenopyrite for gold recovery by cyanidation ,

Read "Pyrolysis of arsenopyrite for gold recovery by cyanidation, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips , Pyrolysis of arsenopyrite for gold recovery by cyanidation , The roasting of arsenical gold ores: a ....

Arsenic | Article about arsenic by The Free Dictionary

When it is prepared commercially from sulfide ores, eg, 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...

The Pirate Surgeon's Journal: Golden Age of Piracy: The ,

A third Substance, which goes by the name of Mummy, is a Carcase [carcass] terrified [torrefied - roasted] under the , dark or yellowish Kind, as being more impure Sometimes, however, native Cinnabar, by Means of some vitriolic, or even arsenical Particles , tells us, that at Friburg in Germany they take the Ore, out of which ....

Aspects of arsenical materials and their long term ,

Aspects of arsenical materials and their long term stability under environment conditions PMSwash and AJ Monhemius MIRO Arsenic Research Group Imperial College of Science , Smelting and roasting of ores and concentrates usually at temperatures...

Review Pretreatment Process on Refractory Gold Ores with As

Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG , Roasting oxidation inevitably will emit a certain amount of toxic and harmful gases in the process Microwave roast- , pose of arsenical pyrite and gold concentrate with pyrite, the...

Arsenic in Gold Processing: Mineral Processing and ,

The sources of arsenic and the various process options for treating arsenical gold ores and concentrates are briefly reviewed The problem relating to the removal of arsenic from gaseous emissions from roasting processes is considered...

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)...

USGS Water-Resources Investigations Report 98-4016 ,

Industrial activities at this Superfund site included possible roasting of arsenical ores and the production of arsenical pesticides from about 1917 to 1945; arsenic concentrations that greatly exceed 20 parts per million have been measured in soils at the Superfund site...

A kinetic study of pyrite in the lime roasting of a ,

A kinetic study of pyrite in the lime roasting of a vertical cyclone - , KOREA S&T JOURNALS search word HOME >Journal Browse >About Journal >Journal Vol & Issue >Full Record A kinetic study of pyrite in the lime roasting of a vertical cyclone Journal title : , The Roasting of Arsenical Gold Ores, Gold 100, pp367-389 Related Links ....

The influence of roasting temperature upon gold recovery ,

OBJECT OF INVESTIGATION Pyritic and arsenical ores containing sub-microscopic gold have long been regarded as refractory requiring special treatment to free the gold for solution by cyanide The sulphides are usually roasted to free the gold and the calcines cyanided...

soda roast gold ore - crusherasia

roasting and smelting of gold ore - BINQ Mining How to Roast Gold Before Leaching | eHow The gold bearing rock is called ore , come across this with arsenical ores, and it is difficult to avoid unless you roast the ore first ....

Arsenic Removal - [PDF Document]

This is the temperature range where arsenical ores are roasted w9x Arsenic, sulfur and many of their compounds have significant vapor pressures at the roasting temperatures of arsenical concentrates Žie, 4508 to 6508C...

Characterization of Mill Products to Understand Solid ,

Roasting of As-bearing sufide ores and concentrates is a pyro- metallurgical pre-treatment process that was commonly utilized in the extraction of refractory gold and some smelting operations...

STRIVING FOR A SUSTAINABLE MINING INDUSTRY: ARSENIC ,

ores, some metal arsenide minerals have already been or could well be , During the roasting of arsenopyrite concentrates for their gold recovery, , stable arsenic compounds or arsenical sludge through the hydrometallurgical processing of arsenic-containing materials The commercially practiced...

Arsenical | Article about arsenical by The Free Dictionary

Industrial exposures can impact workers involved in smelting of contaminated metal ores, manufacturing of certain types of glass, manufacturing of certain metal alloys, manufacturing and application of arsenical pesticides, and those in the semiconductor industry where arsenic is used as a dopant...

roasting iron from antimony ore - zvchattrickbe

Roasting Arsenic & Antimony Or The difficulty of roasting arsenical and antimonial ores may be , and the ore frequently stirred with an iron wire , Off on Roasting Arsenic & Antimony Or Get More Info; Iron Ore Antimony - amonkarsin...

Arsenicosis | definition of Arsenicosis by Medical dictionary

see inorganic arsenic poisoning, organic arsenic poisoning (above) arsenic trioxide AsO 3 , pollutant on pasture from roasting of arsenical and some iron or...

The Canadian Mining Hall of Fame

His achievements at Beattie led to the treatment of the arsenical ores at Giant Yellowknife He went on to establish the Ventures Ltd Research Laboratory at Beattie and another at Lakefield, Ont This lab still flourishes today as Lakefield Research...

Arsenic - USGS Mineral Resources Program

consumed by one manufacturer of arsenical herbicid Metallic arsenic was consumed in the manufacture of , resources of arsenic occur in copper ores in northern Peru and the Philippines and in copper-gold ores in Chile In , 8Byproduct of gold ore roasting Excludes production of noncommercial grade material estimated at 9,000 tons per year...

Pyrite roasting, an alternative to J sulphur burning

Pyrite roasting and sulphur burning plants are , 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...

Processing refractory gold ores | Arsenic | Oxygen

TABLE 1 Refractory ore processing projects Processing Rate Pro~ect Country (approx) Goldstrike McLaughlin Getchell Sao Bento USA USA USA Brazil 1500 t/d ore 3000 t/d ore 3000 t/d ore 240 t/d cone examples of which are shown in Table 1 these being the traditional process routes involving Roasting and more recently Pressure Oxidation...

of sulfur vapor in roasting gold ores - prahavpohybueu

Patent US5254320 Method for roasting sulphide ores A method for roasting sulphide ores or ore them with water vapor making the ore suitable for gold leaching...

Types of Metals - City University of New York

is the separation of metals from ore by heating the ore in a reducing environment , Roasting of Sulfidic Ores Sulfidic ores are roasted in an oxygen-rich furnace to oxidize the ore 2 CuS + 3 O 2 = 2 CuO , First arsenical copper probably produced accidentally by smelting As-...

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 bronzeThe 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 behaviour Copper ore is often naturally contaminated with arsenic; hence, the term ....