Chloride ion passivator, preparation method and desulfurization wastewater treatment method

Abstract

The invention provides a chloride ion passivator, which comprises the following components in terms of mass percentage: 0.001-0.2% of amine, 0.0001-0.01% of fat, and the balance is water; the amine is polyacrylamide and / or alkene Amine, described grease is acrylic acid-acrylate copolymer, or acrylic acid-AMPS-maleic anhydride terpolymer; Also provide a kind of preparation method of chloride ion deactivator; Also provide a kind of desulfurization wastewater treatment method, adopt above-mentioned Chloride ion deactivator. In the present invention, after the desulfurization wastewater is added with a passivating agent, the chloride ion is deactivated, the corrosion of the chloride ion is blocked, and the desulfurization wastewater is turned into non-corrosive ordinary wastewater for evaporation and crystallization treatment, which significantly reduces the investment cost of the system and greatly improves The life and reliability of the system, no by-products appear, realize the zero discharge treatment of desulfurization wastewater, and protect the water resource environment.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a chloride ion passivator, a preparation method and a desulfurization wastewater treatment method. Background technique [0002] Limestone-gypsum wet desulfurization technology is widely used in my country. At present, more than 90% of coal-fired power plants in my country use this technology to remove sulfur dioxide in flue gas. The desulfurization process will produce desulfurization wastewater during operation. The wastewater has the characteristics of high salt content, high concentration of suspended solids, high hardness, high concentration of chloride ions, and some heavy metal ions. It is the most difficult wastewater to treat in coal-fired power plants. one. [0003] With the implementation of the "Water Ten Measures" promulgated by the State Council and the release of HJ2301-2017 "Guidelines for Pollution Prevention and Control of Thermal Power Plants", th...

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Problems solved by technology

[0004] It can be seen from the DL / T 997-2006 "Water Quality Control Indicators for Limestone-Gypsum Wet Desulfurization Wastewater in Thermal Power Plants" that the concentration of chloride ions in the existing desulfurization wastewater can reach up to 20000mg / L, which is extremely corrosive. During the discharge treatment process, both equipment and flue will be severely corroded. At present, the technical solution adopted in the industry is to use corrosion-resistant metal materials; the second solution is to paint anti-corrosion materials on ordinary steel materials, but the above two technologies However, there are technical risks such as high price, short lifespan, and difficulty in ensuring reliability, which have become the bottleneck restricting the promotion of zero discharge technology for desulfurization wastewater.

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