A treating method of fluorine-containing waste water

Abstract

A treating method of fluorine-containing waste water is disclosed. The fluorine-containing waste water comprises F-, SO4<2-> and Al<3+>. The method includes: bringing the fluorine-containing waste water and a water-soluble aluminum-source fluorine removing agent into contact and adjusting the pH value of the fluorine-containing waste water to be not lower than 5 to perform neutralization and sedimentation reactions; bringing the fluorine-containing waste water after the neutralization and sedimentation reactions and discharged sludge from a coagulating sedimentation treating unit of waste water free of fluorine into contact; and subjecting the obtained mixture to sludge dehydration to obtain dehydrated sludge and filtrate. The method can perform effective fluorine removal treatment for the fluorine-containing waste water having high contents of the F-, the SO4<2-> and the Al<3+>.

Description

technical field

[0001] The invention relates to a treatment method for fluorine-containing wastewater, in particular to a treatment method for effectively removing fluorine from fluorine-containing wastewater produced in the molecular sieve production process. Background technique

[0002] Phosphorus-containing skeleton silicon-rich ultra-stable Y molecular sieve (PSRY molecular sieve) is a new type of skeleton silicon-rich molecular sieve prepared by NaY molecular sieve through hydrothermal roasting and complex acid dealumination of silicon. It is prepared with PSRY molecular sieve as the main active component Fluid catalytic cracking (FCC) catalyst has the characteristics of good coke selectivity, high gasoline octane number, strong heavy oil cracking ability, and high diesel yield. After successful industrial trial production, FCC with PSRY molecular sieve as the main active component The catalyst has been used in many heavy oil catalytic cracking units across the country...

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