Our Projects

(PDF) Characterization of refractory behaviour of complex

Improvement of Silver Extraction by Ultrafine Grinding Prior to Cyanide Leaching of the Plant Tailings of a Refractory Silver Ore By A. Deniz Bas and ibrahim alp Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore

Get Price

Silver Metal Extraction from Refractory Silver Ore Using

Jan 28, 2021The percentage recovery of the dissolved silver obtained from the refractory ore was 57.64% at 90 C before the untreated pressure oxidation (ambient leaching), while the recovery has been increased by about 5% and reached 62.35% at 150 C when applying the pressure leaching method by using an autoclave.

Get Price

(PDF) Applications of NSC Pressure Leaching

Refractory Gold Ores, pp. 431-439 in Proc. Intern. Symp. Processing Complex . Ores, editors: Pressure Leaching of Silver from Refr actory Sulfide Concentrate, pp. 119-151 in .

Get Price

Pressure Cyanide Leaching for Precious Metals

Pressure oxidation is a hydrometallurgical oxidative pretreatment for refractory ores, such as sulfide ores. Here, simultaneous alkaline pressure oxidation and sodium cyanide leaching treatments

Get Price

Pressure Oxidation of a Refractory Sulfide

Aug 11, 2018A 98% gold extraction and 95.7% silver extraction was realized as compared to 92.5% and 7.1% gold and silver extraction, respectively, under the best pressure leach conditions without a lime boil. X-ray diffraction analysis of the

Get Price

A review on the negative impact of different elements

The ongoing depletion of gold and silver-containing ore deposits demands a shift towards the processing of more complex sources. Leaching of gold or silver from these sources, which are named refractory and are typically low-grade, can be complicated due to one or more of the following effects: (1) kinetic or thermodynamic impediments on cyanide diffusion or on the dissolution of minerals, (2

Get Price

PRESSURE LEACHING

Pressure leaching is not a new technology and indeed conventional with over 100 plants constructed and successfully operated over the previous 75 years. The process has proven to be robust, cost effective, and environmentally acceptable for the processing of a

Get Price

An acidic pressure oxidation pre

Aug 01, 1999Aug 01, 1999Oxidative acid pressure leaching of sulphide ores and concentrates - The control of silver losses, in Complex Sulphides, AIME, pp 141. Dutrizac, J.E., 1982. Jarosite-type compounds and their application in the Metallurgical Industry, in Hydrometallurgical Research and Development Plant Practice, Osse Osare, Ed., AIME, pp531-551.

Get Price

Options to Treat Refractory Ores

ore reserves. Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring 'preg robbing' carbonaceous materials or

Get Price

High pressure acid leaching of a refractory lateritic

Sep 01, 2011Sep 01, 2011Abstract. This paper describes the experimental findings of the extraction of nickel and cobalt by high pressure acid leaching (HPAL) of a refractory limonitic nickel laterite ore from the Grdes region of Manisa in Turkey. By optimizing the basic HPAL process parameters: leaching at 255 C with 0.30 sulfuric acid to ore weight ratio with a

Get Price

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.

Get Price

Pressure cyanide leaching for precious metals recovery

Oct 09, 2007R.G.M.S Berezowski and D.R. Weir, "Pressure Oxidation Pretreatment of Refractory Gold," Mine Metallurgy Process (1994), pp. 1–4. 12. J.S. Graham and T.W. James, "Cyanide and Other Lixiviant Leaching Systems for Gold with Some Practical Applications," Mineral Processing and Extractive Metallurgy Review, 14 (1995), pp. 193–247.

Get Price

Advances in Gold and Silver Processing

68 ADVANCES IN GOLD AND SILVER PROCESSING increased to 50 kg per tonne. Highly refractory ores might require over 100 kg per tonne to yield more than 83 per cent gold by cyanidation. Sawyer and Hendrix (1988) had investigated the effect of sodium hypochlorite on the gold extraction from a carbonaceous ore in Nevada by heap leaching.

Get Price

US4559209A

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

Get Price