Treatment method for high-sodium-content fluoride-containing waste water

A treatment method and technology for wastewater, applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Small emissions and the effect of promoting precipitation

Inactive Publication Date: 2015-07-29
湖南有色金属投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above existing technologies, fluorine is directly removed by directly adding precipitants containing aluminum, calcium, etc., and the fluorine concentration of the treated effluent can only reach below 10mg/L, which is difficult to meet the requirements below 5m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment includes the following steps:

[0024] (1) Preparation of fluorosilicic acid: Add powdered silica to wastewater, control the amount of silica added to 15g / L, stir at a speed of 350r / min, and stir for 20min; filter after the reaction, and the filtrate is fluorosilicon Acid pretreatment solution;

[0025] (2) Lime-flocculation: Add calcium hydroxide powder to the fluosilicic acid pretreatment solution obtained in step (1), wherein the calcium hydroxide powder addition amount is controlled to 35g / L, the end point pH is controlled to 6.5, and the stirring speed is 350r / min , stirring time 20min; after the reaction is over, add a PAM solution with a mass concentration of 0.5%, wherein the amount of PAM added is 0.1g / L, the stirring speed is 150r / min, and the stirring time is 2min; Liquid separation, the supernatant is taken out as the primary effluent; the fluorine concentration of the primary effluent is 48.2mg / L; the bottom is lime residue as solid waste t...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031] (1) Preparation of fluorosilicic acid: Add powdered silica to wastewater, control the amount of silica added to 20g / L, stir at a speed of 350r / min, and stir for 20min; filter after the reaction, and the filtrate is fluorosilicon Acid pretreatment solution;

[0032](2) Lime-flocculation: Add calcium hydroxide powder to the fluosilicic acid pretreatment solution obtained in step (1), wherein the calcium hydroxide addition is controlled to 38g / L, the end point pH is controlled to 7.4, and the stirring speed is 350r / min. The stirring time is 25min; after the reaction is over, add polyacrylamide (PAM) solution with a mass concentration of 0.5%, where the amount of PAM added is 0.1g / L, the stirring speed is 150r / min, and the stirring time is 2min; 4min, solid-liquid separation, taking out the supernatant is the primary effluent; the fluorine concentration of the primary effluent is 41.5mg / L; the bottom is lime residue as...

Embodiment 3

[0036] This embodiment includes the following steps:

[0037] (1) Preparation of fluorosilicic acid: Add powdery silicon dioxide to wastewater, control the amount of silicon dioxide added to 25g / L, stir at a speed of 400r / min, and stir for 30 minutes; filter after the reaction, and the filtrate is fluorosilicon Acid pretreatment solution;

[0038] (2) Lime-flocculation: Add calcium hydroxide powder to the fluosilicic acid pretreatment liquid obtained in step (1), wherein the calcium hydroxide addition is controlled to 42g / L, the end point pH is controlled to 7.8, and the stirring speed is 400r / min. The stirring time is 25min; after the reaction is over, add PAM solution with a mass concentration of 1.0%, wherein the amount of PAM added is 0.2g / L, the stirring speed is 200r / min, and the stirring time is 3min; , taking out the supernatant is the primary effluent; the fluorine concentration of the primary effluent is 38.6mg / L; the bottom is lime residue as solid waste treatment;...

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PUM

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Abstract

The invention discloses a treatment method for high-sodium-content fluoride-containing waste water. The treatment method comprises the following steps of firstly, preparing fluosilicic acid: adding powdered silica in waste water, and filtering after the reaction is ended, wherein filtrate is fluosilicic acid pretreatment fluid; secondly, flocculating lime: adding calcium hydroxide powder in the fluosilicic acid pretreatment fluid, and controlling the pH value of an end point to be 6 to 9; adding a polyacrylamide flocculant, performing a stirring reaction, then standing and precipitating, and taking out supernate, namely primary effluent; thirdly, performing advanced treatment: adding a deep fluoride removing absorbent, performing a stirring reaction, and then standing and precipitating, wherein the precipitated bottom sludge can be recycled, supernate is secondary effluent, and the concentration of the supernate can reach over 5mg/L. According to the treatment method disclosed by the invention, the problems that lime mud in the high-sodium-content fluoride-containing waste water is difficultly precipitate and the effluent difficultly reaches the standard are solved; the consumption of lime is less, the discharge amount of solid wastes is small, effluent fluoride can be stably reduced to below 5mg/L, and the effluent is discharged after the standard is reached.

Description

technical field [0001] The invention relates to a treatment method for high-sodium fluorine-containing wastewater, in particular to a treatment method for effectively removing fluorine from fluorine-containing wastewater generated in the production process of optical glass. Background technique [0002] When optical glass is processed, due to mechanical damage, there will inevitably be defects such as cracks, slits, and scratches on the surface, and these defects will not only lead to changes in the optical properties of the surface of optical glass materials, but will even cause optical damage. The component is directly damaged. Therefore, in the later stage of optical glass processing, various concentrations of acid and alkali etching are often used to change the surface properties of the material. Commonly used lotions mainly include HF, NaOH, etc., and other H 2 SO 4 、HNO 3 Or ammonia and other aids, the silicon on the glass surface will be converted into H under the...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 李程文廖志辉王子龙刘东晓梁亚娟
Owner 湖南有色金属投资有限公司
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