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

Active Publication Date: 2013-12-25
HENAN ZHONGYUAN GOLD SMELTERY
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Problems solved by technology

[0002] At present, the relatively mature professional gold smelting technology at home and abroad generally adopts the process of complex gold concentrate-sulphating roasting-acid leaching to remove impurities-cyanide gold extraction. Acid sludge with different properties is produced due to different dust effects and mineral sources. Generally, it is directly returned to the production process to recover valuable metals such as gold and silver. The valuable element selenium is not effectively recycled, and the harmful element metal mercury circulates in the production system, affecting process indicators. and gold and silver recovery
Chinese patent application CN102642848A (application number 201210115420.9) "Comprehensive utilization method of acid sludge produced in flue gas acid produ

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  • Method for recycling multiple elements in acid mud generated in acid making through gold smelting

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Example Embodiment

[0017] Example 1

[0018] The mass content of the main components contained in an 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 this acid mud after drying and put it into a roasting plate, and evenly spread it into a slurry with 500g of sulfuric acid, put it into a closed muffle furnace that is warmed up to 650 ℃ in advance, and control the roasting at 650 ℃ by introducing air. The selenium was evaporated, and the roasting flue gas was collected by using a sulfuric acid solution with a mass fraction of 5% at 70°C under slight negative pressure, and the selenium and mercury were roasted and evaporated for 3 hours. After dilute acid filtration, a total of 98.06g of selenium-mercury mixture was obtained, 300ml of water was added, 600ml of nitric acid with a mass fraction of 40% was added in small amounts and multiple times, and the acid solution temperature was control...

Example Embodiment

[0020] Example 2

[0021] The mass content of the main components contained in an acid mud is as follows: Au4g / t, Ag1167g / t, Cu 0.5%, Se1.53%, Hg2.82%, Fe19.79%, Pb1.57%, SiO 2 23.18%, Al 2 O 3 2.15%, CaO0.257%, MgO0.212%. Weigh 667 g of this acid mud with a water content of 15% and put it into a roasting pan, mix in 0.4 g of sodium chloride, make it into a slurry with 250 g of sulfuric acid, and spread it evenly, and put it into a closed muffle furnace that is heated to 250 ° C in advance, The selenium was roasted and evaporated at 300°C by introducing air, and the roasting flue gas was collected by using a sulfuric acid solution with a mass fraction of 20% at 80°C under a slight negative pressure, and the selenium and mercury were roasted and evaporated 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 in small amounts and multiple tim...

Example Embodiment

[0023] Example 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 belongs to high selenium and mercury-containing ore, and the recoverable valuable elements are only selenium and mercury. Weigh 200g of this acid mud after drying and put it into a roasting pan, mix it with 300g of sulfuric acid and adjust it into a slurry and spread it evenly. Roasting and steaming selenium, the roasting flue gas was collected with a sulfuric acid solution with a mass fraction of 30% at 90°C under slight negative pressure, and the selenium and mercury were roasted and steamed for 1.5 h. After dilute acid filtration, a total of 111.0g of selenium-mercury mixture was obtained, 800ml of water was added, 1400ml of nitric acid with a mass fraction of 20% was added in small amounts and multiple times, and the acid solution temperature was controlled ...

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Abstract

The invention provides a method for recycling multiple elements in acid mud generated in acid making through gold smelting. The method comprises the following steps of a. pretreating the acid mud generated in acid making through gold smelting, then adding sulfuric acid, stirring the materials uniformly and carrying out roasting; b. absorbing flue gases with hot sulfuric acid and filtering the flue gases; c. adding water to a selenium-mercury mixture obtained after filtration and then adding nitric acid to completely dissolve the selenium-mercury mixture; d. using ammonia water to adjust the pH value of a solution to be 5-6, then adding an ammonium sulfide solution to adjust the pH value of the solution to be 6.5-7.5, reacting for 2-20 hours and filtering the product; e. using sulfuric acid to adjust the pH value of a selenium-containing solution to be 0.5-1.5, adding sulfuric dioxide or sodium sulfite 1.1-1.5 times the substance selenium by amount, filtering the solution and returning the waste liquor to the step b; f. leaching copper and other metal impurities from roasting slag obtained after roasting in the step a with a sulfuric acid solution, then filtering the products, extracting and recycling copper from the filtrate at normal temperature by adopting LIX 984 or adopting iron powder for replacement to obtain copper sponges; g. recycling gold and silver from filter residues with sodium cyanide.

Description

technical field [0001] The invention belongs to the technical field of gold smelting, and in particular relates to a method for separating and recovering gold, silver, selenium, mercury and other multi-metals in acid mud produced by gold smelting. . Background technique [0002] At present, the relatively mature professional gold smelting technology at home and abroad generally adopts the process of complex gold concentrate-sulphating roasting-acid leaching to remove impurities-cyanide gold extraction. Acid sludge with different properties is produced due to different dust effects and mineral sources. Generally, it is directly returned to the production process to recover valuable metals such as gold and silver. The valuable element selenium is not effectively recycled, and the harmful element metal mercury circulates in the production system, affecting process indicators. and gold and silver recovery. Chinese patent application CN102642848A (application number 20121011542...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B15/00C22B43/00C01B19/02
CPCY02P10/20
Inventor 张玉明张福元徐娟王社古孙婷婷
Owner HENAN ZHONGYUAN GOLD SMELTERY
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