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

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...

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