Our Product

function of naoh during leaching of gold ores

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores

2,4 h, and 2M NaOH solution in a 2-L autoclave. Cyanidation of the leach residues resulted in 90 to 93 pct Au and 60 to 80 pct Ag extractions, compared with only 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching a low-grade gold ore and a bulk sulfide flotation concentrate prepared from it.

More

(PDF) A method for leaching or dissolving gold from ores

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using

More

Pretreatment of a refractory arsenopyritic gold ore using

Mar 01, 2015· Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively. • Up to 81% of the gold and 50% of the silver were recovered after ore pretreatment with NaOH. • Gold, and to some extent silver,

More

Selective removal of antimony from refractory gold ores by

Dec 01, 2019· In this study, ultrasound was used to intensify the removing process of antimony from the refractory gold ores. The effects of sodium sulfide concentration, sodium hydroxide concentration, temperature, time and ultrasonic power on the removal rate of antimony were studied in detail. The leaching of gold from the treated ore was also carried out. 2.

More

A Method for Leaching or Dissolving Gold from Ores or

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the

More

naoh ph in gold extraction southportline

Apr 14, 2020· gold processing: cyanide leach process barben analyticalmining: gold processing . and the role that ph control plays in the gold extraction process. . lime (cao) or sodium hydroxide (naoh) is added during this stage.gold dissolution and copper suppression during leaching of copperБ22 aug 2015 . ventional cyanidation processes. the effects of the

More

Selective removal of antimony from refractory gold ores by

Dec 01, 2019· In this study, ultrasound was used to intensify the removing process of antimony from the refractory gold ores. The effects of sodium sulfide concentration, sodium hydroxide concentration, temperature, time and ultrasonic power on the removal rate of antimony were studied in detail. The leaching of gold from the treated ore was also carried out. 2.

More

A Method for Leaching or Dissolving Gold from Ores or

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the

More

(PDF) A method for leaching or dissolving gold from ores

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using

More

(PDF) The Use of Oxygen in Gold Cyanidation Wesley

Direct cyanidation of refractory gold ore or concentrate yields poor gold recovery: therefore. oxidative treatment is conducted on the refractory gold ore or concentrate prior to gold recovery by a cyanide leaching process r&31. Minerals susceptible to oxidation invariably occur in gold ores in much higher concentration than gold.

More

Ultrasound-intensified Leaching of Gold from a Refractory Ore

technique in pretreatment and leaching for the refractory gold ores. KEY WORDS: gold ore; intensified leaching; ultrasound. 1. Introduction Cyanide leaching has been applied to separate gold from ore for over 120 years. Gold ores can be classified as free milling, complex, or refractory based on gold recovery achievable by direct cyanidation.

More

Use of ferricyanide for gold and silver cyanidation

addition of NaOH and H2SO4 solutions. Leaching solutions were sampled at periodic intervals for subsequent analysis. Leaching of the ore sample-A was conducted in a covered 2 L PYREX glass beaker under the room temperature. 500 g ore sample-A was leached in 1 L solution up to 48 h. Comparative leaching of ore

More

The process design of gold leaching and carbon-in-pulp

The gold is recovered from this solution by electrowinning, zinc precipitation or refining technology such as the Mintek Minataur process. The eluted carbon may still contain various organic 48 2 4 4Au NaCN O H O NaAu CN NaOH+++ → + 22 2 The process design of gold leaching and carbon-in-pulp circuits

More

STUDIES ON THE CURING AND LEACHING KINETICS OF

C.3.1 Bromothymol Blue (~0.0064M NaOH) indicator for pH change.. 118 C.3.2 Free Sulfuric Acid Determination With Sodium Hydroxide and Table 6.6 Coefficients of Equation 6.4 for copper recovery as a function of pH and Table 7.6 Calculated mineral grades in the Zaldivar ore for leach modeling.. 83 Table 7.7 Parameters of the

More

Optimizing and evaluating the operational factors

This research was carried out on Aghdareh gold ore. The Aghdareh mine and gold processing plant is located 32 km from Takab city in the western Azerbaijan province, Iran, at 46°58′30′′N and 36°39′29′′E. The grade of gold ore is 3 ppm. Also, cyanide leaching is used to process gold in the Aghdareh mine . The main problem in

More

Effect of pH Alkalinity on Gold Leaching

The role pH has in affecting gold leaching rates by cyanide and the functions of calcium hydroxide in cyanidation are as follow: 1. For safety and to prevent loss of cyanide by hydrolysis. 2. To prevent loss of cyanide by the action of carbon dioxide in the air. 3. To decompose bicarbonates in mill water before using it in cyanidation. 4. To neutralize acidic compounds

More

How to Use Bleach on Gold Ore to Remove Gold Sciencing

Apr 24, 2017· Pour the acid-and-bleach mixture into the plastic bowl with the ore grains and stir. Allow four hours for the gold to dissolve, stirring every 20 minutes. The chlorine reacts with the gold inside the ore to form gold chloride. Filter the ore and bleach solution to remove all the impurities, such as soil and rock fragments.

More

Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation. Alkaline pressure oxidation at 160°C,

More

(PDF) Cyanide Leaching of Copper-Gold-Silver Ores

The competition of cyanide complexation of gold, silver and other metals, especially copper and iron, as well as the influence of sulphide, during cyanide leaching is particularly considered.

More