Patent US5250272 - Process for leaching precious metals with ...

A process for leaching gold and silver from ores and ore concentrates is ... adding an aqueous hydrogen peroxide solution to said slurry in such a way as to set and .... 1,221,842 is for leaching for instance gold and silver from pyrite concentrates, the ..... 2002, Guy Deschenes, Control of lead nitrate addition in gold recovery.

Effect of Lead Nitrate on pH - Leaching (Gold-Silver/Copper or ...

We reverted to the liquid lead nitrate and we have since observed significant ... cyanide levels following Pb+2 addition; if you are adding large quantities of the Pb ... of pyrite, the length of the pre-leaching, and the amount of lead nitrate added.

Associated Sulfide Minerals in Thiosulfate Leaching of Gold - QSpace

Abstract. The effects of some associated minerals on thiosulfate gold leaching were ... chalcopyrite, arsenopyrite, chalcocite, bornite, and some lead species, has ... various sulfide minerals, such as pyrite, pyrrhotite, chalcocite, galena and ... applying chemical additives, such as, carbonate, calcium, galena, phosphate,.

G12AP20054 report - USGS Mineral Resources Program

semiconductor properties that have found application in efficient, yet ...... liberation during cyanide leach from gold-silver telluride minerals as a function of lime addition, oxygen fugacity, lead nitrate addition, and the presence of pyrite and.

Gold Extraction and Recovery Processes - Faculty of Engineering

The common processes for recovery of gold solution includes: (i) Carbon ... using natural gravity concentration processes or leaching gold with natural fluids ... by highly oxidizing, acidic and complexing (chloride) solutions, followed by ..... (iii) Gold/silver values are contained in base metal sulfides of lead, copper and zinc.

The use of oxygen in gold cyanidation - ScienceDirect

Oxygen demand of each gold ore is dependent on the pyrite content and its ... The addition of lead nitrate significantly alters the gold dissolution rate behaviour. .... Leach pulp pH was maintained at a preset level by automatically adding slaked...

75 Gold Recovery Methods - Scribd

Haber Gold Process leaching – 2000s research in New Jersey. ..... Silver, copper, lead and zinc must be removed first by ferric salts. ... The leachate is prepared by adding sodium chloride @ 100 grams/litre, sodium bromide ..... to decompose pyrite and arsenopyrite to liberate copper, gold etc. but achieves only 80% gold...

Influence of lead nitrate on cyanide leaching of gold and silver from ...

Keywords: lead nitrate, gold, silver, cyanide leaching. Introduction ... Dissolution of pyrite forms a sulfur layer on gold causing inhibition of gold dissolution. Thus...

1.1 PHASES OF A MINING PROJECT

copper, nickel, cobalt, gold, silver, lead, zinc, .... waste rock dumps, tailings, heap leach materials. (for gold and silver .... (especially pyrite, or 'fools gold') are abundant and there is ... nitrate, nitrite) can also be found in waters at mine sites, from...

Lead and Zinc - Department of Energy

and gold. The most common lead-ore mineral is galena, or lead sulfide (PbS). .... pyrite. By using the right kind of frothing agent and with the help of special .... by adding zinc to the hot lead, cooling it to the melting point, and skimming off the zinc .... leached with ferric chloride solution, and the lead chloride leachate was...

GOLD ORES - Digital Knowledge

The gold adsorbing properties of pure minerals pyrite, quartz, kaolin and chalcopyrite ..... Zinc cementation, in which zinc dust and lead nitrate is added to the clarified ... The leach and adsorption circuits are occasionally combined by adding...

Cyanidation of a pyrrhotite-bearing gold ore

adding oxygen with lead nitrate. The laboratory results were ... 2003 SDU. All rights reserved. Keywords: Gold; Cyanide; Leaching; Lead nitrate. 1. ... finding means that pyrrhotite is less reactive than pyrite in a cyanide solution. The reactivity of...

effect of lead nitrate on cyanidation of antimonial refractory gold and ...

adding lead nitrate or increasing its concentration. Fine grinding (e.g. ... Keywords: gold; silver; refractory ores; antimony minerals; lead nitrate; cyanidation ... associated with framboidal pyrite and as inclusions within Sb-S and (-Pb) minerals. Celep et al. ... Under the conditions applied for gold leaching, antimony sulphide.

Patent US3330648 - Process for the leaching of pyrite cinders ...

In addition, lead is not dissolved at all by leaching with sulfuric acid but is retained ... zinc, lead, arsenic, gold and silver are removed from the pyrite cinders by ... metal chloride such as sodium chloride, into the N0 ions-containing leaching liquor. ... Throughout this application all leaching liquors are aqueous solutions and...

Full text of "Leaching gold and silver ores : The Plattner and Kiss ...

In order, then, to extract gold and silver from ores by leaching, these metals are ... If com- bined, gold chloride would be formed, which is neither a metal nor a gas. ... It is effected by adding to a solution a substance, either solid or liquid, which .... In this way iron, copper, zinc, and lead sulphides are changed, partly into the...

The metallurgy of antimony - MIT

The deposits frequently contain minor amounts of gold, silver and mercury .... a large application. However, in ... (75 g/tonne), shale oil as a collector (300 g/tonne), lead nitrate as ... trate and a low-grade pyrite concentrate with 20,000 g/tonne silver .... also used as a lixiviant for alkaline sulfide leaching of antimony. The.

GOLD EXTRACTION As the discovery rate and grades fall, John ...

Furthermore a high gold grade to the leach circuit can ... mineral application is limited due to their very ..... feeders, lead nitrate feeders and zinc cones, ... gold locked in sulphide, and most frequently pyrite. The second contributor to refractory.

15.11 Gold leaching - NZDL

cyanide leaching, (agitation leaching, vat leaching, heap leaching) ... Pyrrhotine (magnetic pyrite) is also a detrimental mineral: it binds cyanide ions and ... to control and involves complicated technical equipment, restricting its application to ... lead nitrate solution (from local elements), the cementation of the gold takes place...

Gold Metallurgy & Leaching in Cyanicides - Mineral Processing ...

Jul 14, 2016 ... 4 Leaching Gold with Zinc Minerals in Ore; 5 How Lead Minerals Affect ... Flotation concentrates high in pyrite content are frequently cyanided ... of a lead compound (the nitrate or oxide, for instance) is frequently found to be effective. .... This consists of grinding in water, adding a predetermined amount of...

Chapter 82 - Metal Processing and Metal Working Industry

From the leaching solution the desired metal or its compound is recovered by ... and lead smelting and refining, and mercury and cyanide exposures during gold refining. .... When sufficient copper has been cemented out, the copper-rich iron is put .... Lead ore, iron, silica, lizenithne flux, coke, soda, ash, pyrite, zinc, caustic,...

[PDF] from ceon.rs

During the chalcopyrite leaching by sodium nitrate and sulfuric acid solution, leaching rate ... Since copper, zinc and lead are valuable metals, such deposits may contain significant quantities of silver, gold, bismuth, mercury, antimony ... intergrown, micro-size grains of 10-20 μm are being dispersed within the pyrite [1].

Gold-Precious Metals Conference - ALTA Metallurgical Services

LEAD INTO GOLD – A REVIEW OF THE USE OF LEAD NITRATE TO EXTRACT MORE ... as leach pads, solution application systems, and understanding of process. ..... Gold extractions exceeding 85% have been achieved for all pyrite and...

silver processing | Britannica.com

Jan 28, 2015 ... Lead ores were smelted to obtain an impure lead-silver alloy, which was ... includes large amounts of pyrite (FeS 2) and arsenopyrite (FeAsS). .... This is called inquartation, and the separating of silver and gold by leaching with nitric acid is ... These silver salts are prepared by adding sodium chloride or...

Comparison of different extraction methods to determine gold in ...

The extraction methods were fire-assay (FA), cyanide leach, and methyl isobutyl ketone (MIBK) solvent ... classical and widely accepted lead fire assay method.

Full-Text XML - MDPI.com

Lead nitrate added in the Hunt leaching of bornite produced 99% gold extraction. ... efforts in the development and application of the ammonia-cyanide leaching ... 0.8 Cu-Cl (hydromelanothallite) 2.9 – – acanthite 0.2 magnetite 0.03 – – pyrite...

Cytec Solutions v.17

Rejection of Pyrite: Challenges and Sustainable Chemical Solutions . . . . . . . . . . . . . . . ..... appreciable levels of nitrate ions in their leach solutions. Nitration is a...

Cyanidation of a pyrrhotite-bearing gold ore

adding oxygen with lead nitrate. The laboratory results were ... 2003 SDU. All rights reserved. Keywords: Gold; Cyanide; Leaching; Lead nitrate. 1. ... finding means that pyrrhotite is less reactive than pyrite in a cyanide solution. The reactivity of...

Gold - Encyclopedia - Theodora

Copper and zinc increase the volatility far more than lead, while the greatest volatility is ... by analyses of gold chloride and bromide, and potassium auribromide, ... are galena and iron pyrites, the former being almost invariably gold-bearing. ..... Aurous oxide, Au 2 0, is obtained by cautiously adding potash to a solution of...

Mine Drainage: Characterization, Treatment ... - Ingenta Connect

Globe-Progress gold mine, New Zealand, were ... of Nigeria, where very high concentrations of TDS, hardness, chloride, calcium, ... cadmium and lead were found to be the main contaminants either in .... strain could leach pyrite and marmatite and promote the ..... oxyhydroxides combined with the application of controlled.

The Use of Oxygen in Gold Cyanidation: Canadian Metallurgical ...

Oxygen demand of each gold ore is dependent on the pyrite content and its ... Cyanide consumption was found to be strongly affected by the leaching pH and ... The addition of lead nitrate significantly alters the gold dissolution rate behaviour.

Influence of lead nitrate on cyanide leaching of gold and silver from ...

Keywords: lead nitrate, gold, silver, cyanide leaching. Introduction ... Dissolution of pyrite forms a sulfur layer on gold causing inhibition of gold dissolution. Thus...

The Agency of Manganese in the Superficial Alteration and ... - JStor

able gold is dissolved in 14 days when manganese is p ... waters, or the gold solution itself pyrite. But the dioxide and higher oxides of mangan ... These statements apply to the action of s .... is more extensively leached in manganiferous lodes than in the ..... not abundant in the oxidized zones of lead-bearing ore deposits,.

Types and Causes of Concrete Deterioration - Portland Cement ...

to the metal. Steel, like most metals except gold and platinum, is thermody- ..... The risk of corrosion increases as the chloride content of concrete increases.