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A method for comprehensive recovery and utilization of gold mud wet process tail gas

A wet process and tail gas technology, which is applied in the field of comprehensive recovery and utilization of tail gas of gold mud wet process, can solve the problems of waste, alkaline circulating waste liquid not being recycled, and not being further recycled, etc., and achieve the effect of eliminating pollution hazards.

Active Publication Date: 2016-01-13
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tail gas of the gold mud wet process is usually nitrogen oxide waste gas, acid flue gas and metal-containing smelting particles, etc., while the traditional nitrogen oxide waste gas treatment technology usually chooses the two-stage absorption process of sodium hydroxide solution, which only neutralizes the acidity. Tail gas, the generated tail gas absorption tower circulating liquid is usually alkaline, PH=10-12, this part of the circulating waste liquid still contains a small amount of precious metal elements, the grade of gold is 0.3-0.8g / m3, and the grade of silver is 0.8-1.2g / m3 m3, the lead grade reaches 0.30-0.4g / l, these elements have not been further recovered, and the alkaline circulating waste liquid produced at the same time has not been further recycled, polluting the environment and causing waste

Method used

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  • A method for comprehensive recovery and utilization of gold mud wet process tail gas
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  • A method for comprehensive recovery and utilization of gold mud wet process tail gas

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Effect test

Embodiment 1

[0019] A method for comprehensive recovery and utilization of gold mud wet process tail gas of the present invention comprises the following steps:

[0020] 1) Gold slime preparation process: Gold and silver concentrates are directly cyanided to extract gold and zinc powder replacement process to obtain gold mud and cyanided gold tailings, of which gold mud contains 31.50% gold, 12.50% silver, 13.50% copper, 6.50% lead, 26.50% zinc;

[0021] 2) Gold mud acid leaching process: pickling the gold mud obtained in step 1) with dilute nitric acid with a mass fraction of 20%, the mass ratio of dilute nitric acid to gold mud is 5:1 during pickling, and the temperature of the acid leaching is 80°C , the time of the acid leaching is 6 hours; the tail gas produced (the base metal in the gold mud in the acid leaching operation process reacts with nitric acid to produce nitrogen oxide gas, due to the violent reaction, accompanied by the generation of bubbles, nitrogen oxides and bubbles bu...

Embodiment 2

[0028] A method for comprehensive recovery and utilization of gold mud wet process tail gas of the present invention comprises the following steps:

[0029] 1) Gold mud preparation process: Gold and silver concentrates are directly extracted by cyanide and zinc powder replacement process to obtain gold mud and cyanidation gold tailings, of which gold mud contains 50% gold, 15% silver, 15% copper, 10% lead, 10% zinc;

[0030] 2) Gold mud acid leaching process: pickling the gold mud obtained in step 1) with dilute nitric acid with a mass fraction of 10%, the mass ratio of dilute nitric acid to gold mud is 4:1 during pickling, and the temperature of the acid leaching is 60°C , the time of the acid leaching is 5 hours; the tail gas produced (the base metal in the gold mud in the acid leaching operation process reacts with nitric acid to produce nitrogen oxide gas, due to the violent reaction, accompanied by the generation of bubbles, nitrogen oxides and bubbles bursting and splash...

Embodiment 3

[0037] A method for comprehensive recovery and utilization of gold mud wet process tail gas of the present invention comprises the following steps:

[0038] 1) Gold mud preparation process: gold and silver concentrates are directly cyanided to extract gold and zinc powder replacement process to obtain gold mud and cyanided gold tailings, of which gold mud contains 10% gold, 50% silver, 5% copper, 5% lead, 30% zinc;

[0039] 2) Gold mud acid leaching process: pickling the gold mud obtained in step 1) with dilute nitric acid with a mass fraction of 30%, the mass ratio of dilute nitric acid to gold mud is 3:1 during pickling, and the temperature of the acid leaching is 70°C , the time of the acid leaching is 4 hours; the tail gas produced (the base metal in the gold mud in the acid leaching operation process reacts with nitric acid to produce nitrogen oxide gas, due to the violent reaction, accompanied by the generation of bubbles, nitrogen oxides and bubbles bursting and splashi...

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Abstract

The invention relates to a method for comprehensively recovering gold mud wet technology tail gas, and belongs to the technical field of the treatment, the comprehensive utilization and the gold and silver recovery of the smelting exhaust-gas in the wet gold smelting industry. The method adopts the steps of gold mud preparation, gold mud acid dipping, tail gas absorption, carbon adsorption, and carbon-adsorbed liquid comprehensive utilization to recover the valuable elements of gold, silver and the like in the gold mud wet technology tail gas, and an alkaline circulating waste liquid obtained after the adsorption recovery of the gold and silver by active carbon is directly used for a cyanidated tail residue flotation lead enriching technology as a lead system selecting liquid to further recover other elements comprising lead and the like, so the pollution harms of the alkaline circulating waste liquid to the surrounding environment are eliminated, and the purposes of energy saving, economy, environmental protection and effective comprehensive control are realized.

Description

technical field [0001] The invention relates to a method for comprehensive recovery and utilization of tail gas in a gold mud wet process, and belongs to the technical field of smelting waste gas treatment, comprehensive utilization and recovery of gold and silver valuable elements in the wet gold smelting industry. Background technique [0002] Gold mud wet process tail gas treatment methods include limestone-lime method, ammonia absorption, sodium-alkali absorption method, double alkali method and adsorption method. The tail gas of the gold mud wet process is usually nitrogen oxide waste gas, acid flue gas and metal-containing smelting particles, etc., while the traditional nitrogen oxide waste gas treatment technology usually chooses the two-stage absorption process of sodium hydroxide solution, which only neutralizes the acidity. Tail gas, the generated tail gas absorption tower circulating liquid is usually alkaline, PH=10-12, this part of the circulating waste liquid s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C22B13/00C22B3/24
CPCY02P10/20
Inventor 吕寿明王建政梁志伟王天星
Owner SHANDONG GUODA GOLD
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