Treatment system and method for recycling and zero emission of binary high-salt complex-system nickel hydrometallurgy wastewater

Abstract

The invention discloses a treatment system and method for recycling and zero emission of binary high-salt complex-system nickel hydrometallurgy wastewater. Firstly, organic matter is removed by electro-catalytic oxidation and activated carbon adsorption; then the pH value of the wastewater is adjusted, so that carbonates are completely converted into sulfates; precision filtration is carried out,and then heavy metals which are mainly nickel is recycled through ion exchange and enrichment, so that a sodium sulfate water solution subjected to organic matter removal and heavy metal removal is obtained; finally, anhydrous sodium sulfate in salt water is recycled through spray drying; and meanwhile, dried water vapor is condensed and recycled and is returned to a production system. The invention effectively solves the treatment problem of the complex-system nickel hydrometallurgy wastewater containing heavy metals, high-concentration composite salts and a small amount of macromolecular organic matter, recycling of heavy metal nickel and salt in the wastewater is realized at the same time, and meanwhile, the condensed water can be recycled to the production system, so that comprehensiveutilization and zero emission of resources in the wastewater are truly realized.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment and zero discharge of complex system industrial wastewater, and specifically relates to the recycling of complex system nickel hydrometallurgical wastewater containing heavy metals, high-concentration mixed salts (carbonates and sulfates) and a small amount of macromolecular organic matter and zero discharge treatment systems and methods. Background technique [0002] Metal nickel and its alloys are widely used in various fields of the national economy such as aerospace, military industry, electronic electroplating, civil machinery manufacturing, petrochemical industry, etc., and are important strategic reserve metal resources in my country. Under the current dual pressure and background of resource depletion, energy conservation and emission reduction that the world is facing, the development of new energy has become the most important energy strategy of developed countries. my countr...

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Problems solved by technology

[0006] According to the above reports, the current separation and recycling of salt in high-salt wastewater is mainly aimed at salt with a single component salt or sodium chloride and sodium sulfate as the main components, while for binary systems containing sulfate and carbonate with high The recovery of salt from salty nickel-containing wastewater has not been reported yet

Simultaneously, this waste water involved in the present invention also contains heavy metals such as nickel and a small amount of macromolecular organic matter (extractant and solvent oil), especially the treatment of a small amount of macromolecular organic matter (extractant and solvent oil) that is more difficult to oxidize in the waste water At present, it is also a technical problem in the industry. Therefore, some sulfate-carbonate binary system high-salt nickel-containing wastewater treatment processes currently used have certain shortcomings, and cannot well realize the comprehensive synthesis of metal nickel and sodium salt resources. Recycling and cost-effective zero discharge targets

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