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A method for treating fluorine-containing wastewater by using modified kaolin adsorbent

A technology of kaolin and adsorbent, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of substandard wastewater, waste of production costs, etc., and achieve hydrophilicity enhancement , cost reduction, and high adsorption capacity

Active Publication Date: 2017-12-08
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, considering the practical operability and economic factors, it is also urgent to develop a method for the efficient treatment of fluorine-containing wastewater for the wastewater treatment whose main goal is to meet the standard discharge, so as to overcome the traditional process of treating wastewater caused by the traditional process. Substandard, large waste of production costs and other issues, these are of great significance to the treatment of fluorine-containing wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]The present invention proposes a method for treating fluorine-containing wastewater by using a modified kaolin adsorbent. The preparation process of the modified kaolin adsorbent is as follows: kaolin is added with water to prepare the first pulp with a concentration of 20wt%, and 1.6wt% is added based on kaolin % sodium hexametaphosphate and 0.4wt% sodium hydroxide, stirred in a water bath at 50°C for 0.5h, and allowed to stand for 0.6h; take the upper layer of mud for centrifugation, dry it, and immerse it at 100°C according to the solid-liquid weight ratio of 1:3 Suction filtration in a sulfuric acid solution with a concentration of 4mol / L for 0.4h; add water to prepare the second slurry with a concentration of 40wt%, add 15wt% polydimethyldiallylammonium chloride based on kaolin, and stir at 50°C for reaction 3h, suction filtration, drying at 100°C for 3h, pulverization, and passing through a 100-mesh sieve to obtain the modified kaolin adsorbent;

[0025] The method...

Embodiment 2

[0030] The present invention proposes a method for treating fluorine-containing wastewater by using a modified kaolin adsorbent. The preparation process of the modified kaolin adsorbent is as follows: kaolin is added with water to prepare the first slurry with a concentration of 30wt%, and 1.2wt% is added based on kaolin % sodium hexametaphosphate and 0.8wt% sodium hydroxide, stirred in a water bath at 30°C for 1 hour, and left to stand for 0.3 hours; take the upper layer of mud for centrifugation, dry it, and immerse it at 110°C according to the solid-liquid weight ratio of 1:1. Suction filter in 7mol / L sulfuric acid solution for 0.2h; add water to prepare the second pulp with a concentration of 50wt%, add 5wt% polydimethyldiallylammonium chloride based on kaolin, and stir at 55°C for 1h , suction filtration, dried at 120° C. for 1 h, pulverized, and passed through a 200-mesh sieve to obtain the modified kaolin adsorbent;

[0031] The method for treating fluorine-containing w...

Embodiment 3

[0036] The present invention proposes a method for treating fluorine-containing wastewater by using a modified kaolin adsorbent. The preparation process of the modified kaolin adsorbent is as follows: kaolin is added with water to prepare the first slurry with a concentration of 25wt%, and 1.4wt% is added based on kaolin % sodium hexametaphosphate and 0.6wt% sodium hydroxide, stirred in a water bath at 40°C for 0.7h, and allowed to stand for 0.4h; take the upper layer of mud for centrifugation, dry it, and immerse it at 105°C according to the solid-liquid weight ratio of 1:2 Suction filtration in a sulfuric acid solution with a concentration of 5mol / L for 0.3h; add water to prepare the second pulp with a concentration of 45wt%, add 10wt% polydimethyldiallylammonium chloride based on kaolin, and stir at 52°C 2h, suction filtration, drying at 110°C for 2h, pulverization, and passing through a 200-mesh sieve to obtain the modified kaolin adsorbent;

[0037] The method for treatin...

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PUM

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Abstract

The invention discloses a method for treating fluorine-containing wastewater by using a modified kaolin adsorbent. The preparation process of the modified kaolin adsorbent is as follows: adding water to kaolin to prepare the first pulp, adding sodium hexametaphosphate and sodium hydroxide, Stir in a water bath and stand still; take the upper layer of mud and centrifuge, dry, immerse in sulfuric acid solution, and filter with suction; add water to prepare the second pulp, add polydimethyldiallylammonium chloride, stir for reaction, filter with suction, and dry. crushing and sieving to obtain the modified kaolin adsorbent, wherein the method for treating fluorine-containing wastewater by using the modified kaolin adsorbent includes: flocculation precipitation, electrocoagulation and adsorption treatment processes. The invention has the advantages of wide sources of raw materials for the adsorbent, simple preparation process, high adsorption capacity, high waste water treatment efficiency, simple, mature, practical and economical and reasonable method.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating fluorine-containing wastewater by using a modified kaolin adsorbent. Background technique [0002] If the high-concentration fluorine-containing wastewater produced by industry is discharged directly, the fluorine content in groundwater in this area will increase, which will affect the quality of drinking water. People who drink high-fluoride water for a long time will have diarrhea, fluorosis and other poisoning phenomena. Therefore, it must be treated to make it meet the emission standards. The treatment of traditional fluorine-containing wastewater generally uses calcium hydroxide precipitation method to make calcium ions react with fluoride ions to form CaF 2 Precipitation to achieve the purpose of removing fluorine in wastewater. The process is simple and convenient, and the cost is low, but the calcium fluoride precipitate generated in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12B01J20/30C02F9/06C02F101/14
Inventor 陈喜
Owner ANHUI JINYANG FLUORINE CHEM