A method of treating cyanidation tailings with solidified dry pile using waste acid

A technology for the treatment of cyanide tailings and waste acid, applied in the direction of improving process efficiency, can solve the problems of impractical industrialized large-scale production, low comprehensive utilization value, difficult operation, etc., and achieves elimination of cyanide hazards and pollution hazards. , the effect of improving economic efficiency

Active Publication Date: 2019-01-18
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method proposes a tailings dry stacking method without the construction of a tailings pond, the method requires the tailings to be consolidated and cured for 24 hours before being transported to the site for stacking, and there are great difficulties in the specific operation in mine practice
These two methods are not practical for industrialized large-scale production
[0006] At the same time, in the process of producing sulfuric acid from roasting flue gas, a large amount of low-concentration waste acid (dilute acid) is produced. At present, the low-concentration waste acid (dilute acid) mainly uses alkaline reagents such as lime and carbide slag for neutralization and separate treatment technology , although lime and carbide slag are raw materials with rich sources and relatively cheap prices, but for neutralizing the waste acid with an acidity greater than 15% produced by pyrite roasting and smelting flue gas acid production, the waste per cubic meter The amount of lime and carbide slag used in the acid exceeds 200kg, and more than 500kg of neutralized waste residue is produced. Therefore, the separate treatment of waste acid (dilute acid) still faces the problems of high cost and low comprehensive utilization value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for solidifying dry piles of cyanidation tailings by using waste acid, is characterized in that it comprises the following steps:

[0025] 1) Acidification decomposition: transport the cyanide waste residue produced by the roasting cyanidation process containing 330mg / L of cyanide, 1g / t of gold, 15g / t of silver, and 0.2% of copper to the stirring device, and use 15wt of cyanide produced by the acid system % Sulfuric acid concentration of waste acid is adjusted to obtain 20wt% concentration of ore pulp, then add calcium hypochlorite and powdered activated carbon to it, the amount of calcium hypochlorite added is 20kg / t cyanide waste residue, add powdered activated carbon 10kg / t , the fineness of activated carbon reaches -200 mesh, accounting for more than 90%, and after stirring for 2 hours, the pH of the control end point is 1-3;

[0026] 2) Flotation: pump the acidified pulp to the flotation column, and produce concentrate and flotation tailings through flotat...

Embodiment 2

[0030] A method for solidifying dry piles of cyanidation tailings by using waste acid, is characterized in that it comprises the following steps:

[0031] 1) Acidification decomposition: transport the cyanide waste residue produced by the roasting cyanidation process containing 400mg / L of cyanide, 2g / t of gold, 35g / t of silver, and 0.40% of copper to the stirring device, and use 18wt of cyanide produced by the acid system % Sulfuric acid concentration of waste acid is adjusted to obtain 30wt% concentration of ore pulp, then add calcium hypochlorite and powdered activated carbon to it, the amount of calcium hypochlorite added is 60kg / t cyanide waste residue, add powdered activated carbon 30kg / t , the fineness of activated carbon reaches -200 mesh, accounting for more than 90%, and after stirring for 5 hours, the pH of the control end point is 1-3;

[0032] 2) Flotation: pump the acidified pulp to the flotation column, and produce concentrate and flotation tailings through flota...

Embodiment 3

[0036] A method for solidifying dry piles of cyanidation tailings by using waste acid, is characterized in that it comprises the following steps:

[0037] 1) Acidification decomposition: transport the cyanide waste residue produced by the roasting cyanidation process containing 450mg / L of cyanide, 3g / t of gold, 60g / t of silver, and 0.60% of copper to the stirring device, and use 20wt of cyanide produced by the acid system % Sulfuric acid concentration of waste acid is adjusted to obtain 40wt% concentration of ore pulp, then add calcium hypochlorite and powdered activated carbon to it, the amount of calcium hypochlorite added is 100kg / t cyanide waste residue, add powdered activated carbon 40kg / t , the fineness of activated carbon reaches -200 mesh, accounting for more than 90%, and after stirring for 8 hours, the pH of the control end point is 3;

[0038] 2) Flotation: pump the acidified pulp to the flotation column, and produce concentrate and flotation tailings through flotatio...

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PUM

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Abstract

The invention relates to a method for treating cyanidation tailing solidified dry heaping by using waste acid. The process flow is simple, and waste acids (diluted acids) generated in acid production through flue gas calcination react with cyanidation tailings. Cyanidation tailings treated through the method make the waste acids generated in acid production be further applied, acidolysis and floatation technologies comprehensively recover valuable metals gold, silver and copper and eliminate harms of cyanides in the cyanidation tailings, a high temperature calcination technology comprehensively utilizes neutral residues generated in the acid production waste acid neutralization treatment, and calcination products are solidified pellets, and can be directly transported to a stacking place and are rolled and filled, so pollution harms to surrounding environment are eliminated, the purposes of energy saving, economic property and environmental protection are reached, and the economic benefit of enterprises is improved.

Description

technical field [0001] The invention relates to a method for treating cyanide tailings, in particular to a method for solidifying and dry-stacking cyanide tailings, and belongs to the technical field of cyanide tailings treatment. Background technique [0002] my country is a big mining country, and mines in metallurgy, nonferrous metals, chemical industry, nuclear industry, building materials and light industry have tailings facilities. According to preliminary statistics, there are more than 12,000 tailings ponds in my country, the total amount of tailings storage has exceeded 10 billion tons, and more than 1 billion tons of tailings are added every year, of which tailings facilities in the metallurgical and non-ferrous industries account for the vast majority Most, other industries accounted for about 20%. The discharge and stockpiling of a large number of tailings has caused serious harm to the society, economy, and environment, leading to a series of problems such as wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/16
CPCC22B1/16C22B7/006Y02P10/20
Inventor 徐永祥刘占林王建政孔令强朱德兵梁志伟郭建东
Owner SHANDONG GUODA GOLD
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