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hydrogen peroxide and SO 2 /air) with sulphides in solids, leading to high reagent requirement High reagent cost 3More difficult to handle than peroxide because of fairly large amount of heat generated during mixing peroxide with concentrated sulphuric acid May need to add copper, iron or zinc salts to precipitate iron cyanide
Hydrogen Peroxide 30% DSevere Effect: Hydrogen Peroxide 50% DSevere Effect: Hydrogen Sulfide (aqua) DSevere Effect Sodium Cyanide AExcellent: Sodium Ferrocyanide BGood: Sodium Fluoride BGood: Sodium Peroxide BGood: Sodium Polyphosphate BGood: Sodium
Nov 08, 2016#0183;#32;I just want to ask a question about Hydrogen peroxide used on ground ore. Some miners here in our place are using Hydrogen peroxide on ground ore for the purpose of leaching any copper on the ore. After this they put Sodium cyanide to leach silver and gold. They basically mix ground ore with lime in the vat leach.
Hydrogen Cyanide Oxidoreductases Acting on CHNH2 Group Donors Cyanides Exopeptidases Phloroglucinol Hydrogen Sodium Hydrogen Peroxide Potassium Cyanide Sodium Cyanide Cyanates Amygdalin Charcoal Dermatologic Agents Ipecac Air Pollutants Air Pollutants, Occupational Steam Ether Ethers Sulfenic Acids Toluene Hazardous Substances Chloroform
The effect of hydrogen peroxide on gold leaching rates in alkaline cyanide solution is a matter of controversy and debate. Early studies indicated that the reduction of hydrogen peroxide on gold surfaces is kinetically hindered, and the dissolution rate of gold in oxygenfree solutions containing hydrogen peroxide is very slow.
The final gold extraction rate (95% to 96%) is already reached after two to four hours when hydrogen peroxide is used. And, even more important, it is more than 10% higher than in the case of the aeration after the same time. The final extraction of the cyanide accessible gold was not reached before 48 hours when the simple aeration was used.
The peroxoborate is preferably a sodium or calcium peroxoborate. Compared to previously known leaching techniques in the presence of hydrogen peroxide or calcium peroxide, the leaching process according to the present invention provides a higher and/or faster precious metal yield and/or minimizes the consumption of cyanide and/or oxidizing agent.
Feb 24, 2017#0183;#32;And, it is very tough, under normal conditions, to get the cyanide below about 25 ppm with peroxide alone. My approach to concentrated cyanide wastes (2 5 g/l) is to take the pH down to about 11 with sodium bicarbonate, add copper ions as a catalyst, then peroxide over a period of hours to bring the cyanide down to about 50 ppm.
Decomposition of Cyanide from Gold Leaching Tailings by Using Sodium Metabisulphite and Hydrogen Peroxide DongzhuangHou, 1 LangLiu, 2 QixingYang, 2 BoZhang, 2 HuafuQiu, 2 ShishanRuan, 2,3
Jul 01, 2017#0183;#32;The hydrogen peroxide and the consequent higher level of dissolved oxygen in the alkaline preoxidation tanks promoted faster and more effective oxidation of cyanideconsuming sulphidic species. These species, which used cyanide as complexing agent,
Cyanide Treatment with Hydrogen Peroxide | USP Technologies
hydrogen peroxide and sodium cyanide to remove firescale and oxidation from metal substrates. The mixing of cyanide, a strong reducing agent, and hydrogen peroxide, a strong oxidizer, creates a violently exothermic reaction that has given it the nickname quot;bombingquot;.
This research aimed to degrade free cyanide (CNL) present in the tailing of a metallurgical plant that processes goldbearing ores and uses sodium cyanide (NaCN) as a leaching reagent. Sodium metabisulfite (Na 2 S 2 O 5 ) and sodium metabisulfite with hydrogen peroxide (Na 2 S 2 O 5 + H 2 O 2 ) were used as oxidizing agents.
A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O 2 /liter. In the invention, leaching takes place in the presence of decomposition catalysts and preferably the formed cyanocomplexes are separated during leaching from the leach solution.
Apr 01, 1999#0183;#32;The effect of hydrogen peroxide concentration was determined by measuring the gold dissolution rate at M NaCN, pH 10, 400 min 1, 25#176;C and H 2 O 2 concentrations in the range of mM ().At low peroxide concentrations, the cyanidation rate increased with the initial hydrogen peroxide concentration, reaching a maximum value of 280 mol m 2 s 1 at M H 2 O 2.
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