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Iron-loaded fly ash arsenic-removal adsorbent preparation method

A technology of fly ash and adsorbent, which is applied in the field of water treatment to achieve strong adsorption performance, strong renewability, and environmental friendliness

Inactive Publication Date: 2017-11-24
YUNNAN SHENGQING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is just to provide a kind of preparation method and the application of arsenic-removing adsorbent of iron-loaded fly ash in order to overcome the situation that existing groundwater has arsenic because of various complicated reasons, the present invention uses industrial waste fly ash Using sodium hydroxide and ferric chloride as raw materials to prepare a new type of iron-loaded fly ash as an adsorbent for removing arsenic from water, the modification process has mild conditions, no pollution, easy control, and high yield

Method used

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  • Iron-loaded fly ash arsenic-removal adsorbent preparation method

Examples

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Effect test

Embodiment 1

[0025] Build a test device, wash the fly ash with deionized water to remove impurities, pass through a 100-mesh sieve after drying, weigh 50 ml of fly ash, 250ml of NaOH solution with a concentration of 3mol / L, and stir in a constant temperature water bath at 40°C for 3 hours. Take it out and wash it with water until neutral; add 20ml of FeCl with a concentration of 0.1mol / L dropwise to the alkali-treated fly ash 3 The solution is stirred at 80°C until it becomes dry mud, so that the fly ash is buried in the modifier. The mixture is dried at a temperature of 80°C; after drying, it is passed through an 80-mesh sieve to obtain iron-loaded fly ash.

[0026] Na in the laboratory 3 AsO 4 Prepare arsenic-containing wastewater. For 20ppm arsenic-containing wastewater, the adsorbent dosage is 4g / L, oscillating for 2 hours, filtered with a needle tube with a filter head, diluted several times step by step, and obtained the adsorption equilibrium concentration with an atomic fluoresce...

Embodiment 2

[0028] Build a test device, wash the fly ash with deionized water to remove impurities, pass through a 120-mesh sieve after drying, weigh 45g of fly ash, 250ml of NaOH solution with a concentration of 4mol / L, and stir in a constant temperature water bath at 50°C for 3 hours. Take it out and wash it with water until neutral; add 20ml of FeCl with a concentration of 0.5mol / L dropwise to the alkali-treated fly ash 3 The solution is stirred at 80°C until it becomes dry mud, so that the fly ash is buried in the modifier; the mixture is dried at a temperature of 80°C; after drying, it is passed through a 100-mesh sieve to obtain iron-loaded fly ash;

[0029] Na in the laboratory 3 AsO 4 Prepare arsenic-containing wastewater. For 20ppm arsenic-containing wastewater, the adsorbent dosage is 4g / L, oscillating for 2 hours, filtered with a needle tube with a filter head, diluted several times step by step, and obtained the adsorption equilibrium concentration with an atomic fluorescence...

Embodiment 3

[0031] Build a test device, wash the fly ash with deionized water to remove impurities, pass through an 80-mesh sieve after drying, weigh 60g of fly ash, 250ml of NaOH solution with a concentration of 4mol / L, and stir in a constant temperature water bath at 60°C for 3 hours. Take it out and wash it with water until neutral; add 30ml of FeCl with a concentration of 1mol / L dropwise to the alkali-treated fly ash 3 The solution is stirred at 80°C until it becomes dry mud, so that the fly ash is buried in the modifier. The mixture is dried at a temperature of 80°C; after drying, it is passed through a 120-mesh sieve to obtain iron-loaded fly ash.

[0032] Na in the laboratory 3 AsO 4 Prepare arsenic-containing wastewater. For 20ppm arsenic-containing wastewater, the adsorbent dosage is 4g / L, oscillating for 2 hours, filtered with a needle tube with a filter head, diluted several times step by step, and then obtained the adsorption equilibrium concentration with an atomic fluoresc...

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Abstract

The invention relates to an iron-loaded fly ash arsenic-removal adsorbent preparation method. The method comprises the following steps: 1) taking 45-60 g of fly ash, cleaning the fly ash and removing impurities, drying the fly ash and passing the fly ash through a 80-120 mesh sieve for standby; 2) preparing a NaOH solution with concentration being 3-6 mol / L and a FeCl3 solution with concentration being 0.1-2 mol / L; 3) adding 250-300 ml of the NaOH solution in the fly ash, performing constant-temperature water-bath stirring for 3-5 h at the temperature of 40-80 DEG C, taking the material out and washing the material to neutrality; 4) performing ball milling: adding fly ash in a neutrality state in a ball mill, adding 20-50 ml of the FeCl3 solution, performing mixed grinding for 1-5 h, putting the fly ash in a modifier; and 5) calcining a mixture in a muffle furnace for 4-6 h at the temperature of 380-450 DEG C; and passing the mixture through the 80-120 mesh sieve to obtain the iron-loaded fly ash. The method completes the modification of the fly ash, the process operation is simple, the condition is mild, the control is easy, and the yield is high; the iron-loaded fly ash has obvious adsorption effect on heavy metal in water, the adsorption efficiency is high, and the problem of arsenic pollution in the water can be effectively solved; and the iron-loaded fly ash has the advantages of low cost and easy industrial production, is benefit for environment, and has obvious adsorption effect on arsenic in water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an application method for preparing an adsorbent from iron-loaded fly ash to remove arsenic in water. Background technique [0002] Arsenic is a protoplasmic poison that can cause cell damage and toxicity by interacting with sulfhydryl groups on enzymes and proteins (denaturing proteins and enzymes in cells) and increasing reactive oxygen species in cells, and has a wide range of biological effects. The toxic effects of arsenic on the human body include acute poisoning, chronic poisoning, mutagenicity, teratogenicity, and carcinogenesis. If the human body drinks groundwater with a high content of arsenic for a long time, the arsenic will continue to accumulate in the human body, causing general fatigue, nausea, and chronic poisoning symptoms such as skin lesions and keratinization. Studies have found that long-term drinking of water with high arsenic content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01J20/34C02F1/28C02F101/10
CPCB01J20/041B01J20/06B01J20/08B01J20/103B01J20/3475B01J2220/42C02F1/281C02F2101/103
Inventor 肖惠宁李博潘远凤侯肖邦黄志红肖选虎
Owner YUNNAN SHENGQING ENVIRONMENTAL PROTECTION TECH CO LTD
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