Treatment method for sludge precipitation of ammonia desulfurization solution in iron and steel industry

Abstract

The invention discloses a treatment method for sludge precipitation of an ammonia desulfurization solution in the iron and steel industry, which comprises the following steps: step A, when the specific gravity of an ammonium sulfate solution in a concentration section of a desulfurization tower reaches a specified value, starting a discharge pump, and conveying the ammonium sulfate solution in the concentration section of the desulfurization tower to a precipitation tank; b, when dust and impurities are precipitated to the bottom of the precipitation tank, conveying ammonium sulfate clear liquid on the upper layer in the precipitation tank to an ammonium sulfate preparation system through a clear liquid conveying pump; c, sludge at the bottom of the precipitation tank is pumped into a neutralizing tank through a precipitation pump; and step D, feeding the lime into a neutralizing tank to carry out neutralization reaction until the HP value of the sludge after the neutralization reaction reaches 9. The whole process of settling, washing, neutralizing and the like of the sludge is subjected to on-line treatment, and shutdown treatment is not needed.

Description

technical field [0001] The invention relates to the technical field of sludge precipitation treatment, in particular to a treatment method for sludge precipitation of ammonia desulfurization solution in iron and steel industry. Background technique [0002] Desulfurization and purification of sintering flue gas usually go through a dust collector and then remove sulfur dioxide and remaining dust through a desulfurization system. Since the by-product of ammonia desulfurization is ammonium sulfate fertilizer with high added value, ammonia desulfurization has been used in sintering plants in the steel industry in recent years. More and more promotion and application. However, the dust impurities in the flue gas have a great influence on the operation of the ammonia desulfurization system and the preparation of by-products. Although the dust concentration of sintering flue gas can be controlled at 30mg / Nm after passing through the dust collector 3 However, the water in the amm...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is how to effectively deal with the sludge precipitation of ammonia desulfurization solution to make the desulfurization system run in an orderly manner

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