Method for recycling multiple elements in acid mud generated in acid making through gold smelting
A recovery method and multi-element technology, applied in the direction of element selenium/tellurium, improvement of process efficiency, etc., can solve the problems of ineffective recycling of selenium, low selenium content, affecting process indicators and gold and silver recovery rate, etc. Pollution problem, effect of high gold and silver recovery
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Embodiment 1
[0018] The mass content of main components contained in a kind of acid mud is as follows: Au84g / t, Ag430g / t, Cu6.23%, Se7.97%, Hg11.83%, Fe18.36%, Pb1.73%, SiO 2 39.61%, Al 2 o 3 1.04%, CaO0.194%, MgO0.193%. Weigh 500g of the dried acid mud and put it into a roasting pan, adjust it into a slurry with 500g of sulfuric acid, spread it evenly, put it into a closed muffle furnace that has been heated to 650°C in advance, and pass in air to control the roasting at 650°C Selenium is steamed, the roasting flue gas is collected with a sulfuric acid solution with a mass fraction of 5% at 70°C under a slight negative pressure, and the selenium and mercury are steamed for 3 hours. A total of 98.06g of the selenium-mercury mixture was obtained after dilute acid filtration. Add 300ml of water, add 600ml of nitric acid with a mass fraction of 40% several times in small quantities, control the acid-dissolving temperature at 80°C under stirring conditions, and dissolve completely after 3 ho...
Embodiment 2
[0021] The mass content of the main components contained in an acid mud is as follows: Au4g / t, Ag1167g / t, Cu0.5%, Se1.53%, Hg2.82%, Fe19.79%, Pb1.57%, SiO 2 23.18%, Al 2 o 3 2.15%, CaO0.257%, MgO0.212%. Weigh 667g of the acid mud with a water content of 15% and put it into a roasting pan, mix it with 0.4g of sodium chloride, make it into a slurry with 250g of sulfuric acid, spread it evenly, and put it into a closed muffle furnace that has been heated to 250°C in advance. The air is controlled to roast at 300°C to steam selenium, and the sulfuric acid solution with a mass fraction of 80°C with a mass fraction of 20% is used to collect the roasting flue gas under a slight negative pressure, and the roasting is to steam selenium and mercury for 8 hours. After dilute acid filtration, a total of 22.78g of selenium-mercury mixture was obtained, 100ml of water was added, 150ml of nitric acid with a mass fraction of 40% was added several times in small amounts, the acid-dissolving ...
Embodiment 3
[0024] The mass content of the main components contained in an acid mud is as follows: Au 2g / t, Ag 14g / t, Cu 0.04%, Se48.14%, Hg5.90%, Fe0.704%, Pb2.53%, SiO 2 8.69%, Al 2 o 3 4.15%. The acid mud is a high-selenium mercury-containing ore, and the only valuable elements that can be recovered are selenium and mercury. Weigh 200g of the dried acid mud and put it into a roasting pan, mix it with 300g of sulfuric acid to make a slurry, spread it evenly, put it into a closed muffle furnace that has been heated to 450°C in advance, and control the air flow at 450°C Roasting and distilling selenium, using a 90°C sulfuric acid solution with a mass fraction of 30% to collect the roasting flue gas under a slight negative pressure, roasting and distilling selenium and mercury for 1.5 hours. Obtain altogether 111.0g of selenium-mercury mixture after dilute acid filtration, add 800ml water, add 1400ml mass fraction several times to be the nitric acid of 20% in a small amount, control aci...
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