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Deep defluorination agent and preparation method thereof

A chemical and advanced technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low adsorption capacity of adsorbents, low water content of sedimentary sludge, and high fluoride content in wastewater. The effect of good dehydration performance, fast mass density precipitation and large specific surface area

Active Publication Date: 2021-05-28
北京华德创业环保设备有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the calcium salt precipitation method is currently the most widely used defluoridation method, which has the characteristics of simple operation method, convenient treatment, and low cost, but the calcium salt precipitation method can only reduce the fluoride ion in the wastewater to 10-20mg / L
In addition, the aluminum salt flocculation method is through Al 3+ Generate Al(OH) 3 with F - Removal of F by ligand exchange, physical adsorption, and volume sweeping - , this method has the advantages of less chemical dosage and large treatment capacity, but the fluoride content of the treated wastewater is still high
In addition, the fluidized bed induced crystallization method uses solid crystal nucleus growth technology to precipitate and grow fluoride on the crystal nucleus to achieve the purpose of removing fluoride. The precipitated sludge formed by this method has low water content and high purity, and does not enter the wastewater. Introduce other ions, but the processing process is complicated, and the crystal nucleus needs to be discharged and replenished regularly
In addition, electrodialysis has the advantages of high fluoride removal efficiency and stable treatment, but the price of expensive reverse osmosis membranes limits its application
Adsorption method is currently the most widely used method for treating wastewater containing low-concentration fluoride. This method has mild conditions and wide sources of raw materials, and will not introduce other ions into the wastewater. However, the adsorption capacity of the adsorbent is not high, and frequent replacement is required. Adsorbent Problems

Method used

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  • Deep defluorination agent and preparation method thereof

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preparation example Construction

[0037] Iron salt is nano iron silicate, and its preparation method comprises the following steps:

[0038] At room temperature, after mixing ferrous sulfate monohydrate and sodium silicate evenly, add a mixed solution of nitric acid with a mass concentration of 98% and sulfuric acid with a mass concentration of 93% and stir to react, allowing the raw materials to react at 0-90°C After 24-48 hours, after the reaction is complete, the product is taken out and pulverized, and the product is left for 24-48 hours to obtain nanometer iron silicate.

[0039] In order to further optimize the above technical scheme, the acid includes one or more of hydrochloric acid, sulfuric acid and phosphoric acid.

[0040] Further, the calcium salt includes one or more of calcium chloride, calcium citrate and calcium acetate.

[0041] Further, aluminum salts include polyaluminum chloride.

[0042] Further, the magnesium salt includes one or more of magnesium chloride, magnesium sulfate, magnesium...

Embodiment 1

[0053] A novel defluoridation agent, the preparation method comprising the following steps:

[0054] S1: Preparation of nano iron silicate: at room temperature, mix and stir the solid raw material ferrous sulfate monohydrate and sodium silicate in a molar ratio of 1:0.017, then add nitric acid with a mass concentration of 98% and a mass concentration of 93% A mixed solution of sulfuric acid, wherein the molar ratio of ferrous sulfate monohydrate: nitric acid: sulfuric acid is 1:0.330:1.349, the raw materials are stirred and reacted, and the heat released during the reaction will cause the reaction temperature to rise continuously and accompanied by the formation of NO , to accelerate the reaction, the reaction time is 24 hours, and the reaction temperature is controlled at 0-90°C to complete the oxidation and polymerization reactions between the raw materials. After the reaction is complete, the reactants are taken out and crushed, and placed for 24-48 hours to obtain nano Iro...

Embodiment 2

[0060] A novel defluoridation agent, the preparation method comprising the following steps:

[0061] S1: Preparation of nano-ferric silicate: at room temperature, mix and stir the solid raw material ferrous sulfate monohydrate and sodium silicate in a molar ratio of 1:0.062, then add nitric acid with a mass concentration of 98% and a mass concentration of 93% A mixed solution of sulfuric acid, wherein the molar ratio of ferrous sulfate monohydrate: nitric acid: sulfuric acid is 1:0.371:1.413, the raw materials are stirred and reacted, and the heat released during the reaction will cause the reaction temperature to rise continuously and accompanied by the formation of NO , to accelerate the reaction, the reaction time is 35 hours, and the reaction temperature is 0-90°C, so as to complete the oxidation and polymerization reactions between the raw materials. After the reaction is complete, the reactants are taken out and crushed, and placed for 24-48 hours to obtain nano-silicon ...

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Abstract

The invention discloses a deep defluorination agent and a preparation method thereof, and belongs to the technical field of chemical materials. According to the technical scheme, the deep defluorination agent is prepared from the following raw materials in weight fraction: 20%-30% of calcium salt, 3%-5% of acid, 10%-15% of ferric salt, 10%-15% of aluminum salt, 2%-3% of magnesium salt, 2%-3% of water glass and the balance water, wherein the ferric salt is nano ferric silicate. Meanwhile, the invention defines a preparation method of the nano iron silicate and the defluorination agent. The nano-scale iron silicate used in the invention has a large specific surface area and can be in good contact with fluorine ions, so that the removal efficiency of the product on fluorine ions in wastewater is improved; and secondly, the preparation method of the raw materials is simple and easy to operate, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a deep defluorination agent and a preparation method thereof. Background technique [0002] Fluorine is one of the trace elements needed by the human body to maintain normal physiological activities. The fluorine needed by the human body mainly comes from drinking water. However, if humans drink water with excessive fluorine content for a long time, fluorosis will occur, causing a series of diseases such as dental fluorosis and skeletal fluorosis. Fluorine content in discharge water. [0003] In the prior art, methods for removing fluorine from wastewater mainly include calcium salt precipitation, aluminum salt flocculation, fluidized bed induced crystallization, electrolytic flocculation, electrodialysis, reverse osmosis, and adsorption. Among them, the calcium salt precipitation method is currently the most widely used defluoridation method, which has the character...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/58C02F101/14
CPCC02F1/5236C02F1/583C02F2101/14
Inventor 李欣童
Owner 北京华德创业环保设备有限公司
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