Method for selective removal of copper from high copper gold loaded carbon by ammoniacal cyanide process
A gold-loaded carbon and selective technology, applied in the direction of improving process efficiency, can solve the problems of weakened adsorption capacity, hidden safety hazards, and hidden safety hazards of HCN gas, and achieve the effect of simple process, safe operation and low consumption
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Embodiment 1
[0041] 1) Take 20 g of high-copper gold-loaded carbon containing Au 79g / t and Cu 40125g / t and place it in a 1000ml iodine flask, add 300ml of water to obtain a high-copper gold-loaded carbon mixed solution;
[0042] 2) Add 10% sodium hydroxide solution to the high copper-loaded gold carbon mixed solution to adjust its pH value to 9.5;
[0043] 3) Add 23% ammonia water to the mixed solution of step 2), so that the initial NH in the mixed solution 3 Mass concentration is 5% (hereinitial mass concentration refers to the mass concentration before decopper reaction starts, the same below);
[0044] 4) Add 19.3% sodium cyanide solution to make the initial CN in the mixed solution - The mass concentration is 2%; at this time, the solid-to-liquid ratio (w / v) in the mixed solution is 1:24;
[0045] 5) Semi-seal the mouth of the iodine bottle with a plastic wrap, shake the bottle at room temperature, 0-700rpm, and carry out the decoppering reaction, and the reaction time is 71h;
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Embodiment 2
[0054] 1) Take 15g of high-copper gold-loaded carbon containing Au 1257g / t and Cu 55324g / t and place it in a 1000ml iodine flask, add 76ml of water to obtain a mixed solution of high-copper gold-loaded carbon;
[0055] 2) Add 25% ammonia water to the mixed solution of high-copper gold-loaded carbon, adjust its pH value to 9.0-14.0 (ammonia water itself is alkaline, and has the effect of alkali treatment), and make the initial NH in the mixed solution 3 The mass concentration is 18%;
[0056] 3) Add solid sodium cyanide to make the initial CN in the mixed solution - The mass concentration is 13%; at this time, the solid-to-liquid ratio (w / v) in the mixed solution is 1:30;
[0057] 4) Semi-seal the mouth of the iodine bottle with a plastic wrap, shake the bottle at room temperature, 0-700rpm, and carry out the decoppering reaction, the reaction time is 80h;
[0058]5) After the reaction is over, vacuum filter the mixed solution obtained in step 5) at -0.08MPa for solid-liquid ...
Embodiment 3
[0064] 1) Take 40 g of high copper-loaded gold carbon containing Au 500g / t and Cu 57011g / t and place it in a 1000ml iodine measuring bottle, add 300ml of water to obtain a high-copper gold-loaded carbon mixed solution;
[0065] 2) Add 10% sodium hydroxide solution to the mixed solution of high-copper gold-loaded carbon to adjust its pH value to 14.0;
[0066] 3) Ammonium chloride is added to the mixed solution of step 2), so that the initial NH in the mixed solution 3 The mass concentration is 5%;
[0067] 4) Measure the pH value of the mixed solution in step 3), if the pH value is lower than 9.0, then add 10% sodium hydroxide solution again to make the pH value not lower than 9.0; add 24% sodium cyanide solution to make the mixed solution Initial CN in solution - The mass concentration is 5%; at this time, the solid-to-liquid ratio (w / v) in the mixed solution is 1:10;
[0068] 5) Semi-seal the mouth of the iodine bottle with a plastic wrap, shake the bottle at room tempera...
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