Method for removing high-concentration chloride ions in water by using modified fly ash

Abstract

The invention relates to a method for removing high-concentration chloride ions in water by using modified fly ash, which comprises the following steps: adding fly ash into a ball mill, and conductingcrushing, ball-milling and sieving to obtain fly ash fine powder; adding a water solvent into the fly ash fine powder, conducting mixing, conducting reacting under the action of ultrasonic waves, andafter the ultrasonic reaction, feeding a reaction solution into a reaction kettle for high-temperature calcination and conducting drying to obtain fly ash powder; adding an antibacterial and anticorrosive additive, conducting heating and stirring, adding a surfactant additive, conducting mixing, conducting reacting under the action of ultrasonic waves, carrying out high-temperature calcination ina reaction kettle after the ultrasonic reaction, and conducting drying to obtain an additive fly ash; adding a modifier, conducting stirring and mixing, conducting reacting under the action of ultrasonic waves, adding n-butyl acrylate, rosin-based diene and diallyl phthalate, conducting stirring, sequentially conducting oscillating and washing with acetone and deionized water, carrying out filterpressing, carrying out vacuum drying, and conducting pulverizing to obtain modified fly ash; and adding wastewater into a reaction box, adding the modified fly ash, conducting stirring, and adding the stirred materials into a centrifugal clarifier for reaction.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for removing high-concentration chloride ions in water by using modified fly ash. Background technique [0002] The methods for removing high chloride ions mainly include precipitation salt method, membrane separation method, evaporation concentration method and so on. Since chloride ions can form soluble salts with most metal ions, it is generally difficult to remove chloride ions by precipitation. Although silver ions can precipitate chloride ions, silver ions are expensive and difficult to apply on a large scale. Cuprous ions can also form precipitation with chloride ions to remove chloride ions in water, but cuprous ions are extremely easy to oxidize and cost high, making it difficult for industrial application. Membrane separation technology can remove chloride ions in water, but most high-concentration chloride ion wastewater will exceed the application limit of membrane te...

AI Technical Summary

Problems solved by technology

Although silver ions can precipitate chloride ions, silver ions are expensive and difficult to apply on a large scale

Cuprous ions can also form precipitation with chloride ions to remove chloride ions in water, but cuprous ions are extremely easy to oxidize and cost high, making it difficult for industrial application

Membrane separation technology can remove chloride ions in water, but most high-concentration chloride ion wastewater will exceed the application limit of membrane technology, and other components in wastewater will cause irreversible pollution to membrane components, thus limiting its application in this field

Evaporation technology is effective in treating high-chlorine wastewater, but it requires high corrosion resistance of equipment. At the same time, due to the high specific heat of water, the evaporation energy consumption is high, resulting in high-cost operation

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