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canada patents for gold leaching reagents

US4913730A - Recovery of gold from aqueous solutions ...

Gold is recovered from aqueous solutions which include a solubilizing ... The reagent comprises a thiourea or a thiosulfate and the solution is a leach, eluate or strip solution. ... Appli ion filed by Canadian Patents and Development Ltd.

US5260040A - Extraction and recovery of gold - Google Patents

The invention relates to the extraction and recovery of gold from gold bearing materials, for example those above mentioned, using leaching methods such as...

GOLD-SILVER: Iberian to patent new eco-friendly alternative ...

26 Jul 2016 ... GOLD-SILVER: Iberian to patent new eco-friendly alternative to cyanide ... lies in developing an equally effective and degradable leach reagent...

CA2409378A1 - Method for thiosulfate leaching of precious ...

Info: Patent citations 116 ; Cited by 50 ; Legal events; Similar documents ... b contacting the pregnant leach solution with a sulfide-containing reagent to...

CA2789095A1 - Process for the recovery of gold from an ore ...

Wilson in US Patent 4,551,213 Recovery of Gold, issued on November 5, 1985, ... carbon is one of the chosen methods for recovery of gold from the solution.

Thiourea Leaching of Gold - Imperial Spiral - Imperial College ...

For over 100 years, cyanide has been the leach reagent of choice in gold mining because of its high gold recoveries, ... A chemical metallurgist, MacArthur was granted British Patent No. ... Canadian Metallurgical Quarterly 36 3 : 149-155.

WO1996000308A2 - Method and apparatus for extracting ...

Recent improvements in the art are disclosed by: Pooley et al. in U.S. Patent No. ... Precious metal extraction by means of cyanidation may include the process steps of ... Alper, J., in "Bacterial methods may strike it rich in refining metals, cleaning ... microorganism isolated from an acid hot spring," Canadian J. Microbiology,...

Non-toxic leaching formula developed for e-scrap - E-Scrap ...

11 Aug 2016 ... Iberian recently announced it filed for a patent from the U.S. Patent and ... Some leaching reagents, including cyanide, are poisonous and...

Full article: A REVIEW OF GOLD LEACHING IN ACID ...

Since the initial report of thiourea as a complexing reagent for gold leaching, ... Primitive methods for gold recovery were employed until cyanidation was patented by ... and G. W. McDonald , Eds. , Winnepeg : Canadian Institute of Mining and...

Modern trends in gold processing — overview - ScienceDirect

Direct leaching of gold ores such as heap leaching, carbon in pulp CIP , carbon in leach ... of alternative leach reagents which could improve environmental concerns as ... Canadian Mining Journal May 1967 , pp. ... US Patent 4,557,795.

A method for leaching or dissolving gold from ores or precious ...

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold ... However, even if several other reagents are known to dissolve gold at the ... of Gold from a Precious Metal Bearing Sludge Concentrate, U.S. patent ... Metals, and Materials Engineering at McGill University, Montreal, Canada.

Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching ...

nickel was used as a alyst to minimize the reagent consumption. On a 100 mass%-75 ... In 1887, cyanidation was patented by MacArthur and the. Forrester ... Symposium on Gold Recovery, CIM, Montreal Quebec, Canada, May. 3–7, 1998 ...

Cyanide-free bio alyzed leaching of ... - YES TECHNOLOGIES

Gold. Description: Process which uses microorganisms for the recovery of precious metals ... and efficacy on par with cyanidation, with a concurrent reduction in chemical reagent costs of about 80 percent. ... Canadian Patent Appli ion No.

US Patent Appli ion for METHODS FOR SELECTIVE ...

26 Apr 2018 ... 62/150,513 Filed: Apr. 21, 2015 and U.S. Provisional Patent Appli ion No. ... Although cyanide is still the main leaching reagent for gold recovery in the ... Extractive Québec,0 Québec City, Canada, second edition, 1999.

A Review of Thiosulfate Leaching of Gold - MDPI

15 Jun 2017 ... Thiosulfate Consumption and Gold Recovery from. Pregnant ... low corrosivity of leach solution, cheap reagents, etc. 11–15 . ... U.S. Patent 4,070,182, 24 January 1978. 18. Grosse, A.C. ... Canada, 3–6 May 1998. 41. Chen...

Thiocyanate leaching of gold - UBC Library Open Collections

27 Sep 2019 ... Goldcorp's Coffee project in Yukon-Canada supplied three mineral samples ... Conditions that improved gold extraction such as reagent dosage, ... for leaching gold occurred in the 1990's after 10 several patents based on the...

The Management of Cyanide in Gold Extraction - Squarespace

Cyanide is one of only a few chemical reagents that will dissolve gold in water. It is ... Patents formalized by McArthur and the Forrest brothers in 1887 and 1888 effec- ... oped by the Canadian mining company INCO and the H2O2 hydrogen...

Heap leaching technology - Core

26 Sep 2015 ... early days of gold heap leaching in the 1970s and 80s, when many projects were ... leaching reagents during their journey downwards with the flowing ... Manabe 2008 patented a method of leaching copper sulphide ore using iodine. ... Meeting of Canadian Mineral Processors, 325-338, Ottawa, Canada.

English - WIPO

1 May 2019 ... Mining patent data: Measuring innovation in the mining industry with patents ... Canadian Intellectual Property Office CIPO and IP Australia for the provision of data, as ... Subsea mining methods and equipment; extraterrestrial mining ... outputs of mineral mining such as gold, iron and aluminum were not...

Thiosulphate Stability In Gold Leaching Process

The current problem of thiosulphate gold leaching is the high reagent ... patented an ammonium thiosulphate leaching process for treating a copper bearing gold ore. ... A Canadian mild refractory gold ore was r n d y used in this study.

US5260040A - Extraction and recovery of gold - Google Patents

The invention relates to the extraction and recovery of gold from gold bearing materials, for example those above mentioned, using leaching methods such as...

US4913730A - Recovery of gold from aqueous solutions ...

Gold is recovered from aqueous solutions which include a solubilizing ... The reagent comprises a thiourea or a thiosulfate and the solution is a leach, eluate or strip solution. ... Appli ion filed by Canadian Patents and Development Ltd.

GOLD-SILVER: Iberian to patent new eco-friendly alternative ...

26 Jul 2016 ... GOLD-SILVER: Iberian to patent new eco-friendly alternative to cyanide ... lies in developing an equally effective and degradable leach reagent...

CA2409378A1 - Method for thiosulfate leaching of precious ...

Info: Patent citations 116 ; Cited by 50 ; Legal events; Similar documents ... b contacting the pregnant leach solution with a sulfide-containing reagent to...

CA2045551A1 - Recovery of gold, silver and platinum group ...

2045551 9010721 PCTABS00002 In the recovery of noble metals, including gold, ... Canada. Laid-open patent appli ion. Download PDF Find Prior Art Similar ... Australian Patent 569175 treats sulfide ores in a pressure oxidation step prior to ... grams/tonne using fire assay and aqua regia and cyanide leach methods.

Thiourea Leaching of Gold - Imperial Spiral - Imperial College ...

For over 100 years, cyanide has been the leach reagent of choice in gold mining because of its high gold recoveries, ... A chemical metallurgist, MacArthur was granted British Patent No. ... Canadian Metallurgical Quarterly 36 3 : 149-155.

WO1996000308A2 - Method and apparatus for extracting ...

Recent improvements in the art are disclosed by: Pooley et al. in U.S. Patent No. ... Precious metal extraction by means of cyanidation may include the process steps of ... Alper, J., in "Bacterial methods may strike it rich in refining metals, cleaning ... microorganism isolated from an acid hot spring," Canadian J. Microbiology,...

Non-toxic leaching formula developed for e-scrap - E-Scrap ...

11 Aug 2016 ... Iberian recently announced it filed for a patent from the U.S. Patent and ... Some leaching reagents, including cyanide, are poisonous and...

IH 2010-001 Reply Impacts of Gold Extraction in the EU

2 Apr 2010 ... Gold leaching using alternative reagents to cyanide . ... Gold Mine in Greenland have been treated in Canada since 2007, thus ... David H. Creasey and Edwin B. Smith Jr have filed an international patent in April 2009 entitled.

A method for leaching or dissolving gold from ores or precious ...

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold ... However, even if several other reagents are known to dissolve gold at the ... of Gold from a Precious Metal Bearing Sludge Concentrate, U.S. patent ... Metals, and Materials Engineering at McGill University, Montreal, Canada.

glycine as a lixiviant for the leaching of low grade copper-gold ...

have been reported to selectively leach copper over gold from a copper ... Leaching Methods Applicable to Low Grade Ores . ... Philippines, Saudi Arabia, Canada, Argentina, USA, Indonesia, Peru, Mexico, ... Solutions: Google Patents. Iasillo...

the increased activity in the development of thiosulfate based ...

CSIRO's patented breakthrough in the elution of gold thiosulfate from strong ... As a result of recycling the leach solution after resin adsorption, the reagent cost for ... leaching of gold in thiosulfate solutions”, Treatment of gold ores, Canadian.

Gold-Precious Metals Keynote - CSIRO Research ...

copper impacts the cyanidation process economics, at the very least as additional ... There can also be additional downstream costs such as increased reagents ... and patented often referred to as the DuPont process to recover copper and cyanide from copper ... Metallurgists of CIM, Montreal, Canada, 533-544, 2011. 15.

Patents - Process Research Ortech Inc.

Canadian Patents: ... 3, 2869158, CHLORIDE PROCESS FOR THE LEACHING OF GOLD ... 10, 6699446, Methods for separation of titanium from ore.

Gold cyanidation - Wikipedia

Gold cyanidation is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction. Production of reagents for mineral processing to recover gold, copper, zinc ... Several patents were issued in the same year.

Recovering Cyanide From Gold Plant Tailings - SGS

cyanidation process on the environment, both by reducing the risk of spills with less ... gold plant tailings to regenerate and recovery cyanide for recycling, and ... Manitoba, Canada Davis, 1946; Flin Flon ... The Hannah process patents pending ... Consumption mole/mole CN recovered . Reagent. Low. CN:Cu 1 . High.

Patents – Hydrometallurgy and Environment

Patents. P. Benjamin Voigt, A. Ghahreman, “Leaching process”, US 2020/0190624A1. D. Dixon, O. Olvera Olmedo, E. Asselin, A. Ghahreman, Z. Ren, “Process for leaching metal sulphides with reagents having ... “Method for pre-treatment of gold-bearing oxide ores”, US 2014/0356225 A1 ... Kingston, ON, Canada K7L-3N6.

The leaching and adsorption behaviour of gold ores - Minerva ...

considerably since the process was first patented in 1887 MacArthur, 1887 . ... minerals industry and in the major gold producing countries of Australia, Canada, South ... the leaching reagents, but it is difficult to quantify the nature of the gold...

US20090039315A1 - Aqueous solutions containing metal ...

Aqueous solutions containing metal cyanide for cyanide leaching for the ... Info: Patent citations 11 ; Cited by 2 ; Legal events; Similar documents ... are generally dissolved in water according to methods known in the prior art. ... US5482694A * 1994-08-19 1996-01-09 Canadian Liquid Air Ltd.-Air Liquide Canada Ltee.

Gold recovery: Effect of ozonation on refractory gold ores prior ...

Mineral processing of refractory gold ore is uneconomical through conventional processing methods. The ore recovery is normally below 80% due to sulphide...

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