Hypochlorite has emerged as a viable reagent in the dissolution of refractory gold ores, presenting an environmentally sustainable and safer alternative to traditional cyanide-based processes in …
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Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of gold extraction from …
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In our last issue of Mine Water and the Environment (March 2008) the keywords of the following paper were missing and some smaller typos were found. We apologize for any inconvenience this might have caused. Keywords Calcium hypochlorite · Cyanide detoxification · Gold-processing waste water · Sodium hypochlorite · Residual cyanide concentration ...
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In this study, the elimination of cyanide by the addition of hydrogen peroxide and calcium hypochlorite was investigated. This study was conducted to determine the optimum conditions of H 2 O 2 and Ca(OCl) 2 : concentration, pH and contact time, and the combined ratio of concentration H 2 O 2 with Ca(OCl) 2 to remove cyanide in gold mining wastewater.
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For the hypochlorite leaching method, the sodium hypo-chlorite (NaOCl) or calcium hypochlorite (Ca(OCl) 2)isusu-allyusedtoproduce chlorineionsinthesolution[2].Ineither case, these materials can be ionized in water and generate the hypochlorous acid in the pH range of 4.0 to 7.5, or aqueous chlorine in the presence of chloride and pH<4.0 ...
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Mining industry has been using cyanide for more than ten decades to recover precious metals such as gold and silver. The presence of cyanide in the environment has long been a matter of concern ...
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An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a …
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I am contemplating adding cyanuric acid to my hypochlorous acid leach. I have used this leach on my sluice concentrates at ph 5 with addition of non iodized salt with good …
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KEYWORDS: refractory gold ore, oxidation, gold extraction, calcium hypochlorite, pretreatment 1. INTRODUCTION Gold extraction continues to be a primary activity in the mining-metallurgy industry. According to the 2024 Annual Report of Mexico's Mining Chamber,1 Mexico obtained ninth place in gold production worldwide with a participation
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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.
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research that studies the use of calcium hypochlorite as an oxidizing agent to produce a chloride solution and allow the gold to dissolve and make a type of gold chloride.16,27,30,31,33 Hasab et al.16 used a refractory concentrated mineral in a flotation cell and then oxidized/leached it with calcium hypochlorite andsodium chloride at room ...
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Effects of calcium hypochlorite concentration, initial pH and sodium chloride concentration on the recovery of gold were examined. ... (Barika Mine in Sardasht). The ore was ground to 90% finer than 37.4 ... Combining sulfide oxidation and gold leaching using chloride/hypochlorite solution was used for a refractory sulfide concentrate ...
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Leaching pure gold with an acidic sodium hypochlorite solution has been demonstrated to be effective. The initial rate of gold dissolution was extremely rapid. In a …
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In this study, the elimination of cyanide by the addition of hydrogen peroxide and calcium hypochlorite was investigated. This study was conducted to determine the optimum conditions of H 2 O 2 and Ca(OCl) 2 : concentration, pH and contact time, and the combined ratio of concentration H 2 O 2 with Ca(OCl) 2 to remove cyanide in gold mining …
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This research is aimed at investigating a feasible and economical technique for the removal of cyanide from tailing wastewater of Muteh gold mine. In this research, removal from Muteh factory's waste water, was achieved at Tarbiat Modares University's mineral processing laboratory through the oxidation of cyanide by calcium hypochlorite.
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This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum ...
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In this study, the elimination of cyanide by the addition of hydrogen peroxide and calcium hypochlorite was investigated. This study was conducted to determine the optimum conditions of H 2 O 2 and Ca(OCl) 2 : concentration, pH and contact time, and the combined ratio of concentration H 2 O 2 with Ca(OCl) 2 to remove cyanide in gold mining wastewater.
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Gold Mining & Metal Detecting. Prospecting, Mining, Ore & Geochemical . Using cyanuric acid in hypochlorous acid leach. Thread starter Goldcat; Start date Apr 8, 2018; Help Support Gold Refining Forum: ... The Hypochlorite I use in my leach contains it but I'm working with a sealed rotating bucket system.
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Calcium hypochlorite produced a sluggish gold leaching kinetics, requiring twice more time (46 h) to achieve the maximum gold recovery of 58% compared to sodium …
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water from the Muteh gold mine in Iran was oxidized by sodium and calcium hypochlorite to cyanate (CNO-), which is 1,000 times less environmentally hazardous than cyanide. Experiments were conducted using waste water containing 270 mg/L cyanide over a pH range of 6–13 and temperatures between 25 and 50 C. Cyanide was removed
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This present article reviews the determination and detoxification of cyanide found in gold mine tailings. Most of the cyanide remains in the solution or the slurries after the cyanidation process. ... (2016) Elimination cyanide with hydrogen peroxide (H 2 O 2) and calcium hypochlorite (Ca(OCl) 2) on gold mine waste from North Luwu, South ...
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An emerging reagent for gold dissolution, calcium hypochlorite (Ca(OCl) 2), presents lower toxicity and cost-effectiveness compared to other reagents [11]. Hydrochlorination aids in processing refractory concentrates ... The refractory gold ore sample was obtained from Apex Mining Co., Inc. Mineral liberation analysis (MLA) of
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The current work investigated the use of the sodium chloride -calcium hypochlorite couple as gold lixiviant and sought to determine optimum values for the parameters: (i) …
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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 …
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Li studied the gold extraction from tailings using sulfuric acid as a pretreatment before calcium hypochlorite leaching . The obtained results showed that the leaching rate of Au was 81% using 8% calcium hypochlorite, 333 K chlorination temperature and …
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Sodium hypochlorite provides a faster reaction rate compared to calcium hypochlorite. ... al., 2014; Lu et al., 2017; Nam et al., 2008; Sun et al., 2016). The global trend in mining industry in general and in gold mining in particular is that production of metals is permanently growing but the ore grades and resource availability are steadily ...
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I then added 30g ammonium chloride and the solution turned brick orange. I heated to below boiling and added the Calcium Hypochlorite (small amounts at a time lots of stirring). As you can see in the picture, the red powder floats on top like a thick milkshake and some sink to the bottom.
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The only area of concern using calcium hypochlorite is if your water has a lot of sulfate ions in it. You will then get gypsum precipitating and gold losses into the gypsum. Most town water supplies have relatively low levels of sulfate ions but there are always some local supplies which are a problem.
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Sodium hypochlorite provides a faster reaction rate compared to calcium hypochlorite. To have a reasonable leaching rate, ... For the treatment of the gold tailing from Sunshin Mine which is located by the sea, it has been proposed that sea water should be used for gold leaching. Most sea water has a salt content of 30–35 g/L NaCl, which is ...
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This study aims to improve the efficiency of gold extraction from refractory ores by introducing an oxidative pretreatment step using a calcium hypochlorite. This compound plays a crucial role in the process as it facilitates the oxidation of the sulfide minerals, mainly pyrite …
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In laboratory experiments, cyanide in waste water from the Muteh gold mine in Iran was oxidized by sodium and calcium hypochlorite to cyanate (CNO-), which is 1,000 times less environmentally ...
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In this context, the findings of our study, which demonstrate the efectiveness of oxidative pretreatment with calcium hypochlorite in improving gold extraction from refractory ores, hold …
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In laboratory experiments, cyanide in waste water from the Muteh gold mine in Iran was oxidized by sodium and calcium hypochlorite to cyanate (CNO−), which is 1,000 times less environmentally hazardous than cyanide. In laboratory experiments, cyanide in waste water from the Muteh gold mine in Iran was oxidized by sodium and calcium hypochlorite to cyanate (CNO−), which is …
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Caustic soda in gold mine. Gold mine and Caustic soda, is a highly versatile and widely used chemical compound in various industries, including mining. One of its primary applications in gold mining is the extraction of it from its ores.. Process of aurous mining. The stone aurous extraction process typically involves a series of chemical reactions, including leaching, leaching is …
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In this paper, in order to select the most appropriate method to remove cyanide from the wastewater of the Moteh gold mine, based on the experts' opinions, the use of calcium hypochlorite, sodium hypochlorite, and hydrogen peroxide was chosen as forerunning alternative in the form of a multi-stage model.
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Li studied the gold extraction from tailings using sulfuric acid as a pretreatment before calcium hypochlorite leaching . The obtained results …
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Mine Water Environ (2008) 27:127 DOI 10.1007/s10230-008-0042-8 ERRATUM Detoxification of Cyanide in a Gold Processing Plant Tailings Water Using Calcium and Sodium Hypochlorite A. Khodadad Æ P. Teimoury Æ M. Abdolahi Æ A. Samiee Published online: 25 April 2008 Springer-Verlag 2008 Erratum to: Mine Water Environ (2008) 27:52–55 DOI …
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The concept of hypochlorite treatment prior to cyanidation in the heap leaching of low grade carbonaceous gold ores is discussed. Laboratory column leach tests using a low grade carbonaceous ore were performed to investigate the effects of pH, hypochlorite consumption and concentration, and bed height on total gold extraction. At high pH, hypochlorite stability …
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The effects of calcium hypochlorite ... neous oxidative pretreatment and gold leaching of a sulfide concentrate using the chlo- ... (Barika Mine in Sardasht). Flotation was conducted at 25°C with
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