Preparation method of composite modified fluoride-removing adsorbent

A composite modification and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problems of low particle strength, frequent regeneration, low adsorption capacity, etc., and achieve the strengthening of Lewis acid-base Effect, strengthen electrostatic effect, improve the effect of adsorption capacity

Inactive Publication Date: 2017-08-29
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commonly used fluorine-removing adsorbents include zeolite, activated alumina, bone char, etc. These adsorbents not only have low adsorption capacity, short service life, frequent regeneration, but also have other disadvantages, such as low regeneration efficiency of zeolite; activated alumina exists in When used under acidic pH (4.5-5.5) conditions, the adsorption capacity is low (the saturated adsorption capacity is generally 10-20 mg / g), which is easy to cause the dissolution of aluminum, low particle strength, and easy to break after long-term soaking. There are many problems in the application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] First, weigh 3kg of pig bones, place them in a drying oven, and dry them at 110°C until they reach a constant weight. Then put the dried pig bones into a pulverizer to grind them, pass through a 100-mesh sieve, and place the sieved animal bone powder in a In a muffle furnace, heat to 700°C, heat-preserve and calcinate for 2 hours. After cooling to room temperature, wash the calcined product 5 times with deionized water, and dry naturally to obtain natural porous hydroxyapatite powder; then weigh 7.5g of aluminum sulfate , add 100mL deionized water, stir at 400r / min for 30min, heat to 40°C, then add 36mL of 5% sodium hydroxide solution dropwise at 2mL / min, continue to stir for 2h after the dropwise addition, cool to room temperature and then statically Set aside for 2 hours to obtain an aluminum-based sol; then weigh 200g of natural porous hydroxyapatite powder and add it to 600mL of absolute ethanol, stir at 400r / min for 30min, then add the obtained aluminum-based sol, a...

example 2

[0023] First weigh 2kg of fish bones, place them in a drying oven, and dry them at 105°C until they reach a constant weight. Then put the dried animal bones into a pulverizer and grind them, pass through a 100-mesh sieve, and place the sieved animal bone powder in a In a muffle furnace, heat to 600°C, heat-preserve and calcinate for 1 hour. After cooling to room temperature, wash the calcined product 3 times with deionized water, and dry naturally to obtain natural porous hydroxyapatite powder; then weigh 5.0 g of aluminum sulfate , add 80mL of deionized water, stir at 300r / min for 20min, heat to 35°C, then add 24mL of 5% sodium hydroxide solution dropwise at 1mL / min, continue to stir for 1h after the dropwise addition, cool to room temperature and stand still Set aside for 1 hour to obtain an aluminum-based sol; then weigh 100 g of natural porous hydroxyapatite powder and add it to 500 mL of absolute ethanol, stir at 300 r / min for 20 minutes, then add the obtained aluminum-bas...

example 3

[0025]First weigh 2.5kg of animal bone, place it in a drying oven, and dry it to constant weight at 107°C, then put the dried animal bone into a pulverizer and grind it, pass through a 100-mesh sieve, and place the sieved animal bone powder in a In a muffle furnace, heat to 650°C, heat-preserve and calcinate for 1 hour. After cooling to room temperature, wash the calcined product 4 times with deionized water, and dry naturally to obtain natural porous hydroxyapatite powder; then weigh 6.2 g of sulfuric acid Aluminum, add 90mL of deionized water, stir at 350r / min for 25min, heat to 37°C, then add 30mL of 5% sodium hydroxide solution dropwise at 1mL / min, continue stirring for 1h after the dropwise addition, and cool to room temperature Stand still for 2 hours to obtain aluminum-based sol; then weigh 150g of natural porous hydroxyapatite powder and add it to 550mL of absolute ethanol, stir at 350r / min for 25min, then add the obtained aluminum-based sol, and react for 2 hours in a ...

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Abstract

The invention belongs to the technical field of water treatment and particularly relates to a preparation method of a composite modified fluoride-removing adsorbent. The method comprises the steps of crushing and calcining an animal bone as a raw material and then washing to prepare hydroxyapatite powder with a porous structure; preparing an aluminum-based sol by using aluminum sulfate, loading the aluminum-based sol on the hydroxyapatite powder, wherein the specific surface area of the natural porous hydroxyapatite powder is further improved and the adsorption capacity is improved and can reach 120-130mg/g through the synergistic effect of the aluminum-based sol and organic carbon among pores of the hydroxyapatite powder; preparing a solution from a rare-earth salt and a metal salt, and compounding rare-earth ions and metal ions through the synergistic effect of an aluminum base and hydroxyapatite under an alkaline condition, thereby further strengthening the electrostatic effect and strengthening the effects of lewis acid and base and the complexing action with fluoride ions and reducing the concentration of the fluoride ions in underground effluent to 0.9mg/L. The preparation method has the characteristics of being high in adsorption rate, easy to regenerate and stable in performance.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a composite modified fluorine removal adsorbent. Background technique [0002] Fluorine in nature is in a compound state, mainly including: fluorite, fluoroapatite, cryolite and so on. They are all important chemical raw materials, widely used in industrial production such as aluminum smelting, phosphate fertilizer, steel, organic synthetic chemical industry, electronics industry, atomic energy industry, organic fluorine advanced lubricating oil, rocket propellant, etc. A large amount of fluorine-containing wastewater is discharged in industrial production, polluting the environment. In addition, fluorine pollution can poison animals and plants and affect agricultural and animal husbandry production. According to the national "Comprehensive Wastewater Discharge Standard", the concentration of fluoride ion in the primary standard shoul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/28B01J20/30C02F1/28C02F101/14
CPCB01J20/048B01J20/0207B01J20/0211B01J20/0222B01J20/0229B01J20/046B01J20/08B01J20/28057C02F1/28C02F2101/14
Inventor 龙海燕薛洋杨阳
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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