A novel liquid defluoridation agent and its preparation method and application

Abstract

The invention discloses a novel liquid defluoridation agent, its preparation method and application, and belongs to the technical field of fluorine-containing wastewater treatment. The liquid defluoridation agent of the present invention is composed of the following components by mass fraction: polyaluminum chloride 25%, polyaluminum ferric chloride 17%, magnesium sulfate 9%, N,O-carboxymethyl chitosan 6%, coagulation aid 3%, purified water 40%. When the fluorine-removing agent of the invention is used to treat low-concentration fluorine-containing wastewater, the fluoride ion concentration of the effluent can be less than or equal to 1.0 mg / L, and the fluoride-removing effect is good.

Description

A new type of liquid defluorination agent and its preparation method and application technical field The present invention relates to a kind of defluorination agent and preparation method and application thereof, be specifically related to a kind of novel liquid defluorination agent The preparation method and application thereof belong to the technical field of fluorine-containing wastewater treatment. Background technique [0002] Coal chemical wastewater is industrial wastewater produced in the coal chemical production process. Coal chemical production process is based on coal as raw material Through chemical production processes such as coal coking, coal gasification, coal liquefaction, and tar chemical industry, coal is converted into gaseous, liquid, and solid states. products and a variety of chemical products. The waste water produced by this production process mainly includes coking waste water, gasification waste water and liquefaction waste water. water. T...

AI Technical Summary

Problems solved by technology

However, single use of CaO or Ca(OH) 2 To treat fluorine-containing wastewater, the generated CaF 2 The precipitate will be wrapped in Ca(OH) 2 The surface of the particles makes the utilization efficiency of calcium salts low, and the precipitation process is very slow, which can only reduce the concentration of fluoride ions to 20-30mg / L, which cannot meet the national emission standards

Existing by adding CaF 2 Crystal nucleus, simple use of calcium salt / aluminum salt / iron salt combined with flocculant to remove fluoride can only reduce the concentration of fluoride ion to 8-10mg / L, which can just meet the "Comprehensive Wastewater Discharge Standard" (GB8978-1996 )Require