Peroxide is sometimes also added into or subsequent to the INCO process. Detailed descriptions of these processes can be found in the literature (1, 2). This paper presents findings from fundamental investigations of these three cyanide destruction processes currently being utilised by the gold industry; SO2/air, hydrogen peroxide and Caro's ...
US4966715A US07/354,039 US35403989A US4966715A US 4966715 A US4966715 A US 4966715A US 35403989 A US35403989 A US 35403989A US 4966715 A US4966715 A US 4966715A Authority US United States Prior art keywords cyanide hydrogen peroxide phosphoric acid wastewater concentration Prior art date Legal status (The legal status is an assumption and is not a …
SCN) as compared with the oxide ore (0 mg/L SCN). SMBS/Air and hydrogen peroxide routes re-port somewhat reduced reagent costs. MMS CN-DTM reagent costs are significantly lower than those of the other three cyanide destruction process routes considered. Additional upside potential exists in the case of the MMS CN-DTM Process, given that additional
metal iron cyanide precipitate • Can oxidize CN-WAD efficiently Disadvantages: • Less selective than the alternative processes. Reacts more readily (than hydrogen peroxide and SO 2 /air) with sulphides in solids, leading to high reagent requirement • High reagent cost • 3More difficult to handle than peroxide
For comparison purposes, an isolated experiment using hydrogen peroxide for the oxidation of cyanide was made in conditions comparable to one of the Caro's Acid runs. Fig. 6 shows the kinetic curves of CN breakdown of a solution with initial [CN − ] = 100 mg/L, using Caro's Acid and hydrogen peroxide in equal doses and other conditions.
Destruction of cyanide by hydrogen peroxide in tailings slurries from low bearing sulphidic gold ores. Download. Related Papers. Tratamiento DETOX CN 2005. By Elber Puga. Heterogeneous catalytic degradation of cyanide using copper-impregnated pumice and hydrogen peroxide. By Mehmet Kitis.
Oxidation of cyanide in water by singlet oxygen generated by the reaction between hydrogen peroxide and hypochlorite. By Cristian Rodrigo Mancipe Sarmiento. Tratamiento DETOX CN 2005. ... Destruction of cyanide by hydrogen peroxide in tailings slurries from low bearing sulphidic gold ores.
In solution applications, other destruction processes, such as the hydrogen peroxide process, are preferred to the Caro's acid process. The theoretical usage of H2SO in the process is 4.39 grams H2SO5 per gram of cyanide oxidized, but in practice 5.0 to 15.0 grams H2SO5 per gram of cyanide oxidized is required.
Similarly, the initial rate of cyanide destruction (i.e., removal within 30 min) also increased significantly with increasing peroxide dosages, consistent with the literature in which the rate of catalytic cyanide oxidation with peroxide and Ru/MgO catalyst was determined by H 2 O 2 /CN ratio (Pak and Chang, 1997).
Several advanced oxidation processes for the destruction of cyanide contained in waste waters from thermoelectric power stations of combined‐cycle were studied. Thus, oxidation processes involving ozonation at basic pH, ozone/hydrogen peroxide, ozone/ultraviolet radiation and ozone/hydrogen peroxide/ultraviolet radiation have been carried out ...
1 COMPARISON OF THE MMS CN-DTM CYANIDE DESTRUCTION PROCESS WITH . CARO'S ACID, SMBS/AIR AND HYDROGEN PEROXIDE OPTIONS . By . 1 Mike Adams . 1 Maelgwyn Australia Pty Ltd, PO Box 374, Guildford, WA 6935, Australia . Presenter and Corresponding Author . Mike Adams . madams@maelgwyn
Several advanced oxidation processes for the destruction of cyanide contained in waste waters from thermoelectric power stations of combined-cycle were studied. Thus, oxidation processes involving ozonation at basic pH, ozone/hydrogen peroxide, ozone/ultraviolet radiation and ozone/hydrogen peroxide/ultraviolet radiation have been carried out ...
Hydrogen peroxide oxidizes free cyanide to cyanate as follows: The efficiency of hydrogen peroxide cyanide destruction has been demonstrated repeatedly, and it is well known that solutions containing 500 mg/L WAD cyanide…
In solution applications, other destruction processes, such as the hydrogen peroxide process, are preferred to the Caro's acid process. The theoretical usage of H2SO in the process is 4.39 grams H2SO5 per gram of cyanide oxidized, but in practice 5.0 to 15.0 grams H2SO5 per gram of cyanide …
applications, other destruction processes, such as the hydrogen peroxide process, are preferred to the Caro's acid process. The theoretical usage of H2SO5 in the process is 4.39 grams H2SO5 per gram of cyanide oxidized, but in practice 5.0 to 15.0 grams H2SO5 per gram of cyanide …
Hydrogen peroxide oxidizes free cyanide to cyanate as follows: The efficiency of hydrogen peroxide cyanide destruction has been demonstrated repeatedly, and it is well known that solutions containing 500 mg/L WAD cyanide, or more, can be reduced to <2 mg/L within practical time scales, for example, 1 to 2 hr, by the addition of 75 to 125 mg/L ...
Treatment with Hydrogen Peroxide. While hydrogen peroxide will oxidize free cyanide, it is common to catalyze the reaction with a transition metal such as soluble copper, vanadium, tungsten or silver in concentrations of 5 to 50 mg/L (2). The oxidation requires 1.26 lbs H2O2 per lb cyanide …