Synergistic scale-inhibiting heavy metal remover as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of scale inhibition of metal salt compounds. The invention provides a synergistic scale-inhibiting heavy metal remover, the mass ratio of a composite chelating agent to a synergist to a dispersant to water is (10-15): (20-25): (5-10): (20-30), in the synergistic scale-inhibiting heavy metal remover, calcium, magnesium, chromium, cadmium, lead, nickel, copper and mercury in slurry after flue gas desulfurization are chelated through the chelation of the composite chelating agent, and metal compounds are prevented from being deposited on a desulfurization slurry circulating pipeline and a nozzle to influence the desulfurization effect; the synergist improves the capacity of the chelating agent, and meanwhile, the synergist and the chelating agent jointly act to remove metal ions, so that the content of the metal ions is reduced; and the dispersant has a dispersing effect, the whole system is not easy to settle, and the dispersant can be combined with metal ions to prevent generation of scale samples. The heavy metals in the slurry are chelated into insoluble substances, and then the heavy metals deposited in the solid are removed together after the slurry is dehydrated, so that the pollution to the environment is prevented.

Description

technical field [0001] The invention relates to the technical field of scale inhibition of metal salt compounds, in particular to a synergistic scale inhibition heavy metal remover and its preparation method and application. Background technique [0002] Boilers are common production equipment in production and life, and are often used in thermal power plants, smelting, petroleum, chemical, pharmaceutical and other enterprises. Although the boiler has improved production efficiency, the flue gas discharged during the use of the boiler contains a large amount of sulfur dioxide and dust, which has caused great damage to the ecological environment. By installing a desulfurization device at the tail of the flue gas and adding an alkaline desulfurizer Remove the above pollutants. The treatment of boiler flue gas is a hot topic nowadays. Although the boiler flue gas treatment system is put into operation, metal ions and other dust in the flue gas, especially calcium and magnesium...

AI Technical Summary

Problems solved by technology

Although the boiler has improved production efficiency, the flue gas discharged during the use of the boiler contains a large amount of sulfur dioxide and dust, which has caused great damage to the ecological environment. By installing a desulfurization device at the tail of the flue gas and adding an alkaline desulfurizer Remove the above pollutants

The treatment of boiler flue gas is a hot topic nowadays. Although the boiler flue gas treatment system is put into operation, metal ions and other dust in the flue gas, especially calcium and magnesium ions, will be in the boiler flue gas wet desulfurization treatment system. The fouling problem in the pipes, trays, tower walls and nozzles in the desulfurization system is becoming more and more serious. The flue gas treatment system often needs to stop running in one or two months. The fouling in the treatment system brings huge costs and losses

In addition, the flue gas dust contains a large amount of heavy metals, which are highly soluble in water and cause great harm to the environment after sewage discharge.

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