Low-carbon comprehensive utilization method of copper slag after smelting reduction

Abstract

The invention relates to a low-carbon comprehensive utilization method of copper slag after smelting reduction, belonging to the technical field of resources and environment. After a smelting reduction process of copper slag, crude metal raw materials and residues are obtained, and in the smelting reduction process, high-temperature flue gas can be also generated. A residue utilization method comprises the steps of cooling and solidifying the residues by water, mechanically grinding and crushing, adding the crushed residues and biomass powder to a fluidized-state biomass gasifier, and carrying out a gasification reaction under a condition of spraying a gasifying agent, wherein in the gasification reaction process, flammable gases and residues can be generated, and the residues are used as raw materials in constructional engineering. A high-temperature flue gas utilization method comprises the steps of carrying out secondary combustion on the high-temperature flue gas, cooling by waste heat utilization, and then introducing into a biomass pyrolysis and carbonization process as an external heat source, wherein pyrolysis gas, flue gas and biomass charcoal are obtained in the biomass pyrolysis and carbonization process, and the flue gas is discharged after being purified. According to the low-carbon comprehensive utilization method, the technical method of preparing flammable gas and biomass charcoal by pyrolyzing and gasifying biomass by means of waste heat of copper slag and coupling with a smelting reduction process of copper slag is a novel low-carbon metallurgical technology.

Description

technical field

[0001] The invention relates to a low-carbon comprehensive utilization method of copper slag after smelting and reduction, and belongs to the technical field of resources and environment. Background technique

[0002] Resources are the material basis for the survival and development of human beings. With the long-term mining of mineral resources, the primary resources are gradually scarce. The development and utilization of secondary resources is an important way for the metallurgical industry to achieve sustainable development. "Comprehensive Utilization of Mineral Resources" has been listed as a priority theme in the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)". At present, my country's copper production ranks first in the world, and the developed and utilized copper resources account for 67.1% of the country's total proven resource reserves. In order to meet the demand for smelting capacity, the mining grade has dropp...

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