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Method for managing, circulating and utilizing nitronic oxide during golden smelting process

A smelting process and nitrogen oxide technology, applied in the field of environmental protection, can solve problems such as air pollution, harm to human health and plant growth and development, and achieve the effects of reducing the amount of addition, reducing the cost of waste gas treatment, and reducing the amount of NOx efflux.

Active Publication Date: 2010-05-19
贵州金兴黄金矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for the treatment and recycling of nitrogen oxides in the gold smelting process, which solves the problems of serious air pollution by nitrogen oxides, harm to human health and the growth and development of animals and plants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Nitric acid removal of impurities:

[0020] Put gold mud and water into the autoclave, add nitric acid concentration of 20%, liquid-solid ratio of 6:1, close the lid of the autoclave, and stir; then open the oxygen supply valve of the autoclave, and feed oxygen into the autoclave until exhaust When the oxygen content of the outlet gas reaches 99.9%, close the oxygen supply valve and the exhaust valve; add the nitric acid with a concentration of 20% in the still with a nitric acid injector, and start heating the reaction still at the same time, the reaction temperature is controlled at 70 ℃, and Introduce oxygen into the autoclave, and control the pressure in the autoclave at 0.2Mpa, and the reaction time is 4 hours; after the leaching is completed, open the exhaust valve of the autoclave to slowly discharge the tail gas, and feed the tail gas into the washing column for washing. The concentration of sodium hydroxide lye in the column is controlled at 20%; the rate o...

Embodiment 2

[0024] (1) Nitric acid removal of impurities:

[0025]Put gold mud and water into the autoclave, add nitric acid concentration of 24%, liquid-solid ratio of 5:1, close the lid of the autoclave, and stir; then open the oxygen supply valve of the autoclave, and feed oxygen into the autoclave until exhaust When the oxygen content of the outlet gas reaches 99.9%, close the oxygen supply valve and the exhaust valve; add the nitric acid with a concentration of 24% in the still with a nitric acid injector, and start heating the reaction still at the same time, the reaction temperature is controlled at 80 ℃, and Introduce oxygen into the autoclave, and control the pressure in the autoclave at 0.25Mpa, and the reaction time is 5 hours; after the leaching is completed, open the exhaust valve of the autoclave to slowly discharge the tail gas, and feed the tail gas into the washing column for washing. The sodium hydroxide lye concentration in the column is controlled at 20%; the nitric ac...

Embodiment 3

[0029] (1) Nitric acid removal of impurities:

[0030] Put gold mud and water into the autoclave, add nitric acid concentration of 30%, liquid-solid ratio of 4:1, close the lid of the autoclave, and stir; then open the oxygen supply valve of the autoclave, and feed oxygen into the autoclave until exhaust When the oxygen content of the outlet gas reaches 99.9%, close the oxygen supply valve and the exhaust valve; add the nitric acid with a concentration of 30% in the still with a nitric acid injector, and start heating the reaction still at the same time, the reaction temperature is controlled at 90 ° C, and Introduce oxygen into the autoclave, and control the pressure in the autoclave at 0.3Mpa, and the reaction time is 4 hours; after the leaching is completed, open the exhaust valve of the autoclave to slowly discharge the tail gas, and feed the tail gas into the washing column for washing. The sodium hydroxide lye concentration in the column is controlled at 20%; the nitric ...

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PUM

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Abstract

Method for treating and circulation utilizing nitro-oxide during gold smelting process is carried out by refining for gold mud by high-pressure reactor, nitric-acid reacting to obtain nitro-oxide yellow smoke, enclosing it into reactor, adding oxygen into reactor, oxidizing by nitric oxide while converting into nitric acid, metal oxidation and leaching-out reacting, removing nitric acid and purifying gold. It's cheap, circulated utilizes NOx, has less nitric acid, waste-gas discharge and no environmental pollution.

Description

technical field [0001] The invention relates to environmental protection, in particular to a method for treating and recycling nitrogen oxides produced in a gold smelting process. The method of the invention is especially suitable for gold smelting plants using nitric acid. Background technique [0002] As we all know, nitrogen oxides are the main pollutants that cause air pollution, and the nitrogen oxides produced in the gold smelting process have the characteristics of discontinuity, high instantaneous concentration, and fast concentration decay speed. If no measures are taken to deal with them, they will be harmful to the environment and human health. Larger; the hazards of nitrogen oxides, one is corrosion, nitrogen oxides can form acidic substances when they are exposed to water or water vapor, which can cause corrosive damage to most metals and organic substances, and it can also burn people and other living bodies The second is the poisonous effect on the human body....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/06
CPCY02P10/20
Inventor 汪丹巩春龙董德喜金世斌
Owner 贵州金兴黄金矿业有限责任公司