A kind of anti-oxidation barrier material and preparation method and application thereof

Abstract

The invention discloses an anti-oxidation barrier material and its preparation method and application. The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancer and an alkali activator, and the mass ratio is 2-6:2:1. The preparation method of the anti-oxidation barrier material is to first grind the tailings, then add a silicon-aluminum balancer to the ground tailings and mix evenly, then add an alkali activator and mix evenly to obtain a mud. The application is in the anti-oxidation treatment of the tailings pond, and the anti-oxidation barrier material evenly covers the surface of the tailings pond to form an anti-oxidation barrier layer with a thickness of 3-5 cm. The invention realizes the isolation of tailings from external moisture and air, prevents oxygen in water and air from contacting with sulfide components, and prevents the oxidation process of tailings from the root; the invention uses all solid waste raw materials, and the main material is in situ Material collection and engineering application only need to bear the cost of labor and some machinery, and the economic investment is extremely low.

Description

technical field [0001] The invention belongs to the technical field of tailings treatment, and in particular relates to an anti-oxidation barrier material and its preparation method and application. Background technique [0002] Mine tailings have always been one of the most intractable problems and a source of pollution that has caused major environmental problems. According to statistics, there are more than 1,500 large and medium-sized tailing ponds in China, and if various small tailing ponds are added, the total number exceeds 10,000. Its hazards are prominently manifested in acid tailings drainage, vegetation destruction, land degradation, desertification, dust pollution, and water pollution. Acidic leachate is the continuous reaction of sulfur-containing tailings with oxygen in the air, and the formation of sulfuric acid under the action of rainwater, which makes the pH of the tailings leachate acidic (pH=2-4), and the sulfides in the tailings can occur over time Co...

AI Technical Summary

Problems solved by technology

The oxidation of tailings to produce acid will not only lead to the dissolution of valuable metals, but also cause a heavy burden on the environment.

At present, there is no universally recognized and ideal method for the treatment of tailings farms. There are mainly lye neutralization, ex-situ treatment, or use of tailings to develop building materials to reduce tailings inventory, but these methods can only achieve temporary results. Effect, can not fundamentally solve the tailings oxidation problem

[0005] At present, to deal with the oxidation problem of tailings ponds, there are mainly passivation treatment, chemical neutralization method, physical isolation method and phytoremediation, etc., for example, a method for in-situ protection of powdered metal sulfide tailings (CN106623354B), a An ecological restoration method for layered coverage of gold mine tailings (CN109731903A). The common problems of these methods are high input costs and poor long-term effects, and cannot completely and long-term solve the existing problems of tailings

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