Fluorine waste liquid treatment method

A treatment method and technology for fluorine waste liquid, applied in the directions of fluorosilicic acid, tetrafluoroboric acid, halide silicon compounds, etc., can solve the problems such as restricting the production capacity of glass product manufacturers, unfavorable to the sustainable development of the glass industry, and restricting the sales of fluorine waste liquid, etc. To achieve the effect of promoting sustainable development, good economic benefits, and alleviating the pressure of environmental protection

Active Publication Date: 2018-04-13
JIANGXI DONGYAN PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, due to the large amount of fluorine waste liquid produced by the manufacturer every month, and the hydrogen fluoride content in the fluorine waste liquid is relatively low, it not only causes huge environmental pressure on the manufacturer, bu

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  • Fluorine waste liquid treatment method

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a kind of fluorine waste liquid treatment method is provided in the embodiment, implement according to the following steps:

[0031] S11 detects the content of hydrofluoric acid and fluorosilicic acid in the fluorine waste liquid;

[0032] S12 According to the content of hydrofluoric acid and fluosilicic acid, dissolving a theoretical amount of boric acid into hot water at 75-85°C to obtain a boric acid solution;

[0033] S21, adding boric acid solution and fluorine waste liquid to the desiliconization tank while hot, and reacting for 30 minutes to obtain cloudy liquid A;

[0034] S22, suction-filtering and washing the turbid solution A of S21 to obtain silica on the filter residue, aging the filtrate for 4 hours, reducing the content of silica in the mother liquor, and obtaining a supernatant and a turbid solution;

[0035] S23, returning the turbid liquid of S22 to suction filtration and circularly washing the filter residue silica to obta...

Embodiment 2

[0047] Such as figure 1 As shown, a kind of fluorine waste liquid treatment method is provided in the embodiment, implement according to the following steps:

[0048] S11 detects the content of hydrofluoric acid and fluorosilicic acid in the fluorine waste liquid;

[0049] S12 According to the content of hydrofluoric acid and fluosilicic acid, dissolving a theoretical amount of boric acid into hot water at 75-85°C to obtain a boric acid solution;

[0050] S21, adding boric acid solution and fluorine waste liquid to the desiliconization tank while hot, and reacting for 30 minutes to obtain cloudy liquid A;

[0051] S22, suction-filtering and washing the turbid solution A of S21 to obtain silica on the filter residue, aging the filtrate for 4 hours, reducing the content of silica in the mother liquor, and obtaining a supernatant and a turbid solution;

[0052] S23, returning the turbid liquid of S22 to suction filtration and circularly washing the filter residue silica;

[00...

Embodiment 3

[0063] Take 200 g of fluorine waste liquid, the hydrofluoric acid content of this fluorine waste liquid is 5.02% and the content of fluosilicic acid is 8.40% after testing. Put in a 1000ml plastic cup, take another 19.63g of boric acid into the beaker, add 100ml of water, heat to dissolve, or add 100ml of hot water at 75°C to dissolve, add the dissolved boric acid solution to the fluorine waste liquid while it is hot, and continuously Stir until cooling to obtain a mixture of fluoboric acid and silicon dioxide. Suction filter the fluoboric acid mixed solution and silicon dioxide obtained after cooling, wash the silicon dioxide, and keep the silicon dioxide for use. After the filtrate and the washing liquid are combined, place in a plastic beaker, then slowly add 58.62 g of 30% potassium hydroxide and keep stirring. Adjust the pH value of the mother liquor in the plastic beaker to 6, continue to stir and react for 30 minutes until it cools to room temperature; then stop stirri...

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Abstract

The invention discloses a fluorine waste liquid treatment method. The method comprises the following steps: S1, pretreating; S2, desiliconizing: reacting a boric acid solution with a fluorine waste liquid to obtain a turbid solution A, carrying out suction filtration and washing on the turbid solution A, ageing the obtained filtrate to obtain a supernatant and a lower turbid solution, returning the lower turbid solution, carrying out suction filtration, and cyclically washing the obtained filter residues to obtain a filtrate A; and S3, preparing potassium fluoroborate: stirring the filtrate Aand a potassium hydroxide solution, adjusting the pH value of the obtained solution to 5-7, carrying out a reaction to obtain a turbid solution B, carrying out suction filtration and washing on the turbid solution B, centrifuging the obtained residues, and drying the centrifuged filter residues to obtain the potassium fluoroborate. The method fully recovers and utilizes the fluorine waste liquid,so the environmental protection pressure is alleviated, the treatment cost of the fluorine waste liquid is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment and resource recycling, and more specifically, to a method for treating fluorine waste liquid. Background technique [0002] Manufacturers of glass products mostly use industrial hydrofluoric acid to clean the surface of the glass produced. After cleaning, the fluorine waste liquid must be neutralized before it can be discharged, or the fluorine waste liquid can be sold to fluorinated enterprises for recycling. [0003] At present, due to the large amount of fluorine waste liquid produced by manufacturers every month, and the hydrogen fluoride content in the fluorine waste liquid is relatively low, it not only puts a huge environmental pressure on the manufacturer, but also limits the sales of fluorine waste liquid. If the fluorine waste liquid cannot be treated in time, it will seriously restrict the production capacity of glass product manufacturers, which is not conduciv...

Claims

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Application Information

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IPC IPC(8): C01B35/06C01B33/10
CPCC01B33/103C01B35/066
Inventor 段晓军孙燕
Owner JIANGXI DONGYAN PHARMA
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