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Role of NaCN in the extraction of gold is as follows: NaCN is used in leaching of gold. In this process, finely powdered gold is treated with the dilute solution of NaCN, a current of air is passed.
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Gold ores with excessive reagent consumption are able to yield acceptable gold extraction provided that reagent demand is met are also referred to as complex ores (La Brooy et al., 1994). ...
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Hint: We know that extraction is a process in which the impure ore can be treated in several processes for getting pure metals. The process of removal or separation of impurity from the ore is termed as the extraction process. Complete answer As we All know, gold extraction is that process which is usually required for the separation of gold from its ore.
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(i) Dilute NaCN is added as a reagent which selectively dissolves the gold on but not the impurities. (ii) Cryolite decreases the melting point and increases conductivity. (iii) CO helps to convert nickel to a volatile complex which is collected …
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(i) Gold is treated with a dilute solution of NaCN in the presence of air. Au is oxidized to Au + which thenn combines with CN-ions to form its soluble complex. Thus, the role of NaCN in the extraction of gold from its ore is that it helps in the formation of a soluble complex.
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Gold extraction from gold-copper oxides at 300 ppm NaCN and 5 g/L glycine was 45.0% after 24 h (Fig. 1) which is much higher than gold extraction from gold-copper sulfides (30.1% after 24 h at 450 ppm NaCN and 5 g/L glycine). This can be happen particularly when the sulfide is chalcopyrite and the leaching takes place at room temperature.
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Cyanide leaching of gold-silver ore, obtained from Artvin, Cerattepe region of Turkey, was investigated. The effects of NaCN concentration, solid/liquid ratio, type of pH adjustment reagent, lead nitrate and hydrogen peroxide (H 2 O 2) additions in relation to the leaching time on gold and silver leaching efficiencies were examined and the optimum cyanide leaching conditions were …
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In the extraction of gold, dilute NaCN is used as a leaching agent. Gold is converted into a cyanide complex from which the metal is extracted later by replacement. For example, $$4 Au (s) + 8 NaCN (aq) + H_2O + O_2 rightarrow 4 Na [Au(CN)_2] + 4KOH$$
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Extraction of gold from its ores by cyanide leaching has been the preferred method for more than a century because of its simplicity, cost efficiency and the high stability of cyanide. Dissolution …
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High gold and silver extraction wer e obtained by pre- oxidation with ozone by contacting the ore three times with ozone-saturated water or direct addition of ozone
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The gold extraction rate for raw gold ore under optimum conditions (0.25 M potassium bromate, 0.08 M ferric chloride, 0.4 M hydrochloric acid, extraction time of 5 min, stirring speed of 250 rpm ...
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Describe the role of(i) NaCN in the extraction of gold from gold ore.(it) SiO2 in the extraction of copper from copper matte.(iii) Iodine in the refining of zirconium. Write chemical equations for the involved reactions.
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>> Concentration of Ores >> Write the role of Dilute NaCN in the ext. ... Medium. Open in App. Solution. Verified by Toppr. In the extraction of gold, dilute NaCN is used as a leaching agent. Gold is converted into a cyanide complex from which the metal is extracted later by replacement. For example, 4 ...
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Click here👆to get an answer to your question ️ Describe the role of ) NaCN in the extraction of gold from gold ore. (ii) Sio, in the extraction of copper from copper matte. (iii) Iodine in the …
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Question: QUESTION To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H20(1) -> 4 NaAu(CN)2(aq) + 4 NaOH(aq) . a)Determine the mass of gold that can be extracted if 27.1 g sodium cyanide is used. and b)lf the mass of the ore from which the gold was ...
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In the extraction of gold, dilute NaCN is used as a leaching agent. Gold is converted into a cyanide complex from which the metal is extracted later by replacement.
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Describe the role of (i) `NaCN` in the extraction of gold from gold ore. (ii) ` ... of zirconium. Write chemical equations for the involved reactions.
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To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. {eq}4 Au(s) + 8 NaCN(aq) + O_2(g) + 2 H_2O(l) to 4 NaAu(CN)_2(aq) + 4 NaOH(aq) {/eq} Determine the mass of gold that can be extracted if 27.4 g …
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It was observed that extraction of gold increases with increase in concentration of NaCN and ore amount. Maximum leaching of gold (52.89 - 76.53 %) was carried out at 80 oC, 100 minutes leaching ...
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Role of NaCN in the extraction of gold is as follows: NaCN is used in leaching of gold. In this process, finely powdered gold is treated with the dilute solution of NaCN, a current of air is passed. As a result, gold passes into solution forming soluble complex cyanides while the impurities remain unaffected which are filtered off.
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While there are many different processes to remove gold from its encapsulating ore, cyanide leaching (cyanidation) is perhaps the most common and well known. A cyanide solution …
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The extraction of gold from refractory gold ores requires pretreatment before cyanidation to open the package and eliminate the factors affecting the gold cyanide leaching rate. The pretreatments of refractory gold ore in industrial application mainly include two-stage roasting, pressure oxidation, and bacterial oxidation method.
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Describe the role of (i) NaCN in the extraction of gold from its ore. (ii) Cryolite in the ... pure alumina (iii) CO in the purification of Nickel.
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In the extraction of gold, dilute NaCN is used as a leaching agent. Gold is converted into a cyanide complex from which the metal is extracted later by replacement. For example, $$4 Au …
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50% monoclinic and 50% hexagonal. A leach using 8ppm dissolved oxygen yielded only 82.3% gold extraction with a 0.29kg/t NaCN consumed. The addition of lead nitrate, directly to the leach, showed 94.2% gold extraction with only 0.16kg/t NaCN consumption. A gold extraction of 95.0% was obtained by adding oxygen with lead nitrate.
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Thiourea, thiosulfate and environmentally friendly gold extraction agents are gold leaching agent products. This type of product has the advantages of low environmental toxicity and recyclability in place of sodium cyanide. It is suitable for use in the leaching and gold extraction process of various gold-containing ores, thus changing the history of people using sodium cyanide as a …
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Direct cyanide leaching of the ore with air resulted in a low extraction of gold (i.e. 6.7% at 1.5 g/L NaCN over 24 h). High concentration of cyanide (i.e. 5 g/L NaCN) appeared to be required to ...
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It also led to an overall reduction of NaCN consumption from an average of 0.52 to 0.40 ... the crucial role of biocyanidation, the present challenges and future directions toward commercial application of the process. ... The gold extraction rate for raw gold ore under optimum conditions (0.25 M potassium bromate, 0.08 M ferric chloride, 0.4 M ...
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pH plays a significant role in the gold cyanidation process. The leaching pH is maintained at 10.20 10.50 to – prevent cyanide from hydrolyzing and forming HCN.
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(i) Role of NaCN in the extraction of gold is to do the leaching of gold ore in the presence of air from which the gold is obtained later by replacement. (ii) SiO 2 is added to copper matte to …
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