A comprehensive method of mechanical-chemical solidification of copper tailings

Abstract

The invention discloses a comprehensive mechanical-chemical solidification method for copper tailings, which is based on the principle that the content of each heavy metal element in the mixture of tailings and gravel meets the national standard and the content of particle groups with a particle size greater than 0.075mm in the tailings exceeds 50%. After obtaining the optimal percentage of crushed stone mass in the tailings gravel mixture, add an appropriate amount of low-strength Portland cement to the tailings gravel mixture for uniform mixing and paving, and then adopt layered compaction to control the tailings The water content of the crushed stone mixture is at the optimal water content of 13% to 17%. Finally, the self-made equipment is used to carry out the leaching test to ensure that the seepage concentration of various heavy metal elements must be lower than the national standard before entering the engineering application link. The present invention comprehensively applies the mechanical reinforcement and chemical solidification technology to three-dimensionally seal the harmful heavy metals in the tailings, realizes the requirement of reducing the amount of solid waste in the whole process of copper ore smelting, turns waste into treasure, and can also avoid a large number of engineering projects The occupation of arable land due to the need for backfilling earthwork has turned harm into benefit.

Description

technical field [0001] The invention relates to a method for recycling copper tailings and mining waste rocks and other mining and metallurgical wastes. Through the comprehensive application of chemical and mechanical solidification technology, these solid wastes are processed into engineering filling materials, which belong to environmental rock and soil, metallurgy , The technical field of building materials, in particular to a mechanical-chemical solidification method for copper tailings. 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 magnetic separation process to recover copper, gold, silver, sulfur, iron and other valuable components. During the beneficiation process, a large amount of high-alkaline wastewater containing suspended solids and flotation agents is produced, which is collected in the tailings slurry. The tailings of the ...

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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