high ure oxidation of refractory gold minerals

  • Sun High Pressure Oxidation Of Refractory Gold Minerals

    Sun High Pressure Oxidation Of Refractory Gold Minerals Biooxidation Biooxidation uses sulfur consuming bacteria in a water solution to remove sulfur Pressure oxidation Utilizes oxygen and heat under pressure in a liquid medium to effect oxidation of sulfur by way of a controlled chemical reaction High pressure autoclaves

  • OXIDATION OF REFRACTORY GOLD CONCENTRATES AND

    gold. The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate, arsenate and sulfate as well as the dissolution of gold, copper and iron. It appears that the dissolution of gold is due to the complex reactions of gold with thiosulfate ions promoted by the catalytic effect of

  • Pre-oxidation of high-sulfur and high-arsenic refractory

    6/1/2009· Its high oxidizing power (2.0 v) makes it thermodynamically capable of oxidizing all metals, sulfides and arsenides (Roca et al., 2000, Viñals et al., 2001). Since a large proportion of gold ores contain sulfide minerals, the pretreatment of refractory gold ores with ozone has interested many researchers in recent years.

  • Developments in the pretreatment of refractory gold

    The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods.

  • The reasons of gold refractory, Gold ore classification

    11/28/2016· The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical

  • Review Pretreatment Process on Refractory Gold Ores with As

    cacid to oxidize refractory gold or e with As. It’s said that the method is not suitable for all refractory gold ores, but has good results in dealing with symbiotic arsenopyrite gold ore. Because arsenopyrite is easily oxidized. Compared with roasting pretreatment and pressure oxida-tion, acid treatment has low expense. Even so, this method

  • Developments in the pretreatment of refractory gold

    The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods.

  • OXIDATION OF REFRACTORY GOLD CONCENTRATES AND SIMULTANEOUS

    gold. The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate, arsenate and sulfate as well as the dissolution of gold, copper and iron. It appears that the dissolution of gold is due to the complex reactions of gold with thiosulfate ions promoted by the catalytic effect of

  • Pre-oxidation of high-sulfur and high-arsenic refractory

    6/1/2009· Its high oxidizing power (2.0 v) makes it thermodynamically capable of oxidizing all metals, sulfides and arsenides (Roca et al., 2000, Viñals et al., 2001). Since a large proportion of gold ores contain sulfide minerals, the pretreatment of refractory gold ores with ozone has interested many researchers in recent years.

  • Review Pretreatment Process on Refractory Gold Ores with As

    cacid to oxidize refractory gold or e with As. It’s said that the method is not suitable for all refractory gold ores, but has good results in dealing with symbiotic arsenopyrite gold ore. Because arsenopyrite is easily oxidized. Compared with roasting pretreatment and pressure oxida-tion, acid treatment has low expense. Even so, this method

  • The reasons of gold refractory, Gold ore classification

    11/28/2016· The most of refractory ore is gold bearing sulfide. Sulfide iron ore includes many kinds of pyrite and arsenopyrite. Ore and sulfide ore are symbiotic closely under submicron particle, we should...

  • Pre concentration and pressure oxidation of Porgera

    The complex mineralogy of the Porgera resource has a pronounced effect on process selection for the recovery of refractory gold and silver. Intimate association of gold with pyrite necessitates a high degree of sulphur preoxidation to achieve acceptable levels of gold recovery. Acid pressure oxidation has been demonstrated to be the only commercially proven process capable of achieving the

  • Treatment of carbonaceous refractory gold ores

    1/1/1991· The refractoriness of gold is a consequence of ore mineralogy. Refractory gold ores have the following characteristics: (1) gold in intimate association with and locked in sulphide minerals and siliceous gangue, (2) gold associated with active carbonaceous matter and (3)

  • (PDF) Cyanidation of Refractory Gold Ores: A Review

    2 There are many reasons for gold refractoriness such as (1) physically locked grains, (2) chemically locked grains, (3) reactive gangue minerals, (4) adsorption of gold and (5) passivation of

  • Gold extraction Wikipedia

    A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.

  • Refractory ore trouble Russian gold miners Mining

    9/28/2016· Processing sulfide refractory ore using cyanide leaching, for example, may only recover 20% to 40% of the contained gold, a recovery rate that would render most projects uneconomical. For miners in remote areas coping with crumbling winter roads and electricity prices sometimes three times higher than in more populated areas, those kinds of recovery rates are a big deterrent, said OJSC GV Gold