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Method for recycling high-concentration fluoride-containing wastewater

A high-concentration, waste water technology, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problems of unstable defluoridation effect, high treatment cost, large coagulation dosage, etc., to improve the comprehensive Utilization value, stable effluent quality, and the effect of increasing trace elements

Inactive Publication Date: 2017-07-14
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, factors such as fluorine content, alkalinity, salinity, and coagulation and stirring time of raw water all have certain influence on the defluoridation effect; The treatment cost is high, and more difficult-to-handle waste residues are produced at the same time. The defluoridation effect is not very stable. The concentration of sulfate ions in the water quality after defluoridation is high, especially after the treatment. worry about

Method used

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  • Method for recycling high-concentration fluoride-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The desulfurization wastewater from a power plant in Anhui was taken as the raw water of high-concentration fluorine-containing wastewater, and its F - The ion content is 200mg / L-300mg / L, and the pH is around 5.5. It is processed by the method of the present invention, which specifically includes the following steps:

[0027] (1) Flow the raw water of high-concentration fluorine-containing wastewater into the precipitation reaction tank, add calcium chloride solution with a mass concentration of 5% to the raw water according to the molar ratio of Ca:F=1:1.2, and stir and react at a speed of 300rpm for 20min , Then stand still for 20min, solid-liquid separation, collect gained calcium fluoride solid and reclaim fluorine, collect supernatant liquid simultaneously and carry out step (2); The content of fluoride ion in the supernatant liquid is 43mg / L after testing.

[0028] (2) Pretreatment of the supernatant obtained in step (1), including filtering to remove organic mat...

Embodiment 2

[0031] The desulfurization wastewater from a power plant in Anhui was taken as the raw water of high-concentration fluorine-containing wastewater, and its F - The ion content is 200mg / L-300mg / L, and the pH is around 5.5. It is processed by the method of the present invention, which specifically includes the following steps:

[0032] (1) Flow the raw water of high-concentration fluorine-containing wastewater into the precipitation reaction tank, add calcium chloride solution with a mass concentration of 5% to the raw water according to the molar ratio of Ca:F=1:1.8, and stir and react at a speed of 400rpm for 20min , Then stand still for 20min, solid-liquid separation, collect gained calcium fluoride solid and reclaim fluorine, collect supernatant liquid and carry out step (2) simultaneously; The content of fluoride ion in the supernatant liquid after testing is 56mg / L.

[0033] (2) Pretreatment of the supernatant obtained in step (1), including filtering to remove organic mat...

Embodiment 3

[0036] The same method as in Example 1 is used to treat the same waste water as in Example 1, the only difference is that after adding calcium chloride solution in step (1), use ammonia water to adjust the pH=7 of the fluorine-containing wastewater, and the other steps are the same as in Example 1. . After testing, the content of fluoride ions in the supernatant obtained in this example is 21mg / L; The content is 162mg / L.

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Abstract

The invention discloses a method for recycling high-concentration fluoride-containing wastewater. The method is characterized by comprising the following steps: firstly, adding calcium chloride into raw water of high-concentration fluoride-containing wastewater, performing chemical precipitation treatment, separating solid from liquid, collecting calcium fluoride solid and recycling fluorine; and pretreating supernatant liquid, introducing into a diluting compartment and a concentrating compartment of an electrodialyzing device for electrodialysis treatment to realize that the concentration of fluorine ions in electrodialyzed fresh water to be lower than 10mg / L, and treating the electrodialyzed fluoride-containing wastewater as raw water. The method is simple in treatment process, strong in operability and stable in effluent quality, and can be widely applied to recycling treatment of high-concentration fluoride-containing wastewater.

Description

technical field [0001] The invention relates to a process method for recycling high-concentration fluorine-containing wastewater, in particular to a treatment process for fluorine-containing wastewater in industrial production. Background technique [0002] Fluorine is a trace element. Trace amounts of fluorine can promote the growth and development of children and prevent dental caries. Water with a fluoride content of 0.5-1.0 mg / L is beneficial and harmless to the human body, but long-term drinking of high-fluorine content greater than 1.5 mg / L Water will have adverse effects on the human body, and serious cases will cause dental fluorosis and bone fluorosis. Fluorine in nature is mainly contained in fluorspar, fluoroapatite, and cryolite, which are chemical raw materials and are widely used in aluminum smelting, steel, organic synthetic chemicals, electronics industry, atomic energy industry, organic fluorine lubricating oil, fluorinated In industrial production such as ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/14
CPCC02F1/001C02F1/4693C02F1/5236C02F9/00C02F2101/14C02F2301/08
Inventor 汪耀明李为吴亮李传润颜海洋张勤徐铜文
Owner HEFEI CHEMJOY POLYMER MATERIALS CO LTD