Method for mechanical, chemical and biological combined solidification of copper tailings and preparation of engineering filler

Abstract

The invention discloses a method for mechanical, chemical and biological combined solidification of copper tailings and preparation of engineering filler, and provides a packaged technology for material processing, roadbed construction and slope reinforcement. The mass percent is controlled for preparation of a tailing and gravel mixture according to the principle that the content of each heavy metal element of the tailing and gravel mixture meets the national standard and the principle that the content of the particle group with the particle size larger than 0.075 mm is higher than 50%, a proper amount of Portland cement is added, mixed and spread, then the mixture is controlled to be layered and compacted under the optimum water content ranging from 13% to 17%, and the mixture can be applied to engineering after the seepage concentration of each heavy metal element is tested to be lower than the national standard according to a leaching experiment. Ecological slope reinforcement is realized through planting of copper enriching plants during construction, so that migration of the heavy metal elements is further controlled. According to the method, mechanical, chemical and biological solidification technologies are utilized comprehensively, and a three-dimensional closed system of tailing and gravel mixed soil is constructed. The requirement for reduction of solid waste in thewhole process of copper smelting is realized, occupation of cultivated land due to the requirement for a large amount of engineering earthwork can also be avoided, and thus the harm is turned into thebenefit.

Description

technical field [0001] The invention relates to a method for recycling mining and metallurgy waste such as copper tailings and mining waste rocks. Through the comprehensive application of various technologies such as mechanical reinforcement, chemical solidification, and biological adsorption, a systematic and three-dimensional system of tailings mixed soil is formed. A solidification technology network that processes these solid wastes into engineering filling materials to achieve efficient utilization of solid wastes from copper mining and smelting belongs to the technical fields of environmental geotechnical, metallurgy, and building materials, and especially involves a mechanical-chemical —Bio-combined solidification of copper tailings and a method for preparing engineering fillers. Background technique [0002] The production process commonly used in copper ore smelting is: copper-sulfur mixed flotation-mixing and regrinding-copper-sulfur separation-floating tail magnet...

AI Technical Summary

Problems solved by technology

In particular, a large amount of fine-grained copper tailings are piled up in the tailings pond and cannot be disposed of well, which not only occupies a large amount of farmland, but also easily causes harm to the surrounding environment

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