A cobalt complex recovery method for simultaneous flue gas desulfurization and denitrification by cobalt ammonium absorbent

Abstract

Disclosed is a cobalt complex recycling method for a cobalt ammonia absorbent for simultaneous flue gas desulfurization and denitrification, comprising the following steps: 1) spent waste cobalt-containing absorbent in the process of the simultaneous removal of SO2 and NOx in an industrial boiler being subjected to solid-liquid separation and recycling by a microfiltration, ultrafiltration or microfiltration-ultrafiltration combination device (1) to obtain a permeate and a retentate after microfiltration and ultrafiltration, wherein the permeate is then further concentrated by a nanofiltration device (2) to obtain a permeate and a retentate after nanofiltration; 2) the retentate after microfiltration and ultrafiltration and the retentate after nanofiltration entering a pyrolysis device (3) for pyrolysis to obtain cobaltous oxide, wherein the cobaltous oxide is added to an acid dissolution device (4) and mixed with an acid solution to form a cobaltic acid solution; and 3) the permeate filtered by the nanofiltration device (2) and containing NH3.H2O and NH4 +, as a chelating reagent, together with a pH buffering agent, being fed into a mixing device (5), and being mixed with the cobaltic acid solution formed in step 2) and supplementary ammonia water in the mixing device (5) to produce a hexaammine cobalt complex for recycling.

Description

technical field [0001] The present invention relates to a kind of cobalt complex recovery and regeneration method, relate in particular to a kind of NH 3 Remove NOx and SO from coal-fired industrial boiler flue gas simultaneously 2 Recovery and regeneration method of cobalt complex, especially suitable for SO 2 and NO x Environmental protection fields with high removal efficiency and requiring recovery and regeneration of absorbents. Background technique [0002] my country is a country where coal is the main energy source, and coal accounts for more than 70% of my country's primary energy consumption. In the primary energy consumption, coal-fired power plant boilers are mainly used for power generation, while industrial boilers are used for coal-fired supply of steam, hot water, and district heating. According to the "Industrial Boiler Industry Yearbook", as of 2012, my country has 623,000 boilers of various capacities in service, of which about 460,000 are coal-fired i...

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Problems solved by technology

[0007] Aiming at the deficiencies and defects of the cobalt ammonium absorbent simultaneous flue gas desulfurization and denitration system in the prior art, such as low regeneration rate of the complex absorbent, complex absorption and regeneration, etc., the present invention provides a cobalt ammonia absorbent simultaneous flue gas desulfurization and denitrification Cobalt complex recovery method, aiming to further reduce operating costs and increase recovery rate

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