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Method for recycling fluorosilicone in high-salt ammonia-nitrogen wastewater and producing sodium fluoride with coproduction of white carbon black

A technology of ammonia nitrogen wastewater and sodium fluoride, which is applied in the directions of ammonia compounds, alkali metal fluorides, silicon oxides, etc., can solve the problems of complex process, high treatment cost, unrecycled salts, etc., so as to improve economic benefits and reduce treatment costs. cost, the effect of reducing the content

Inactive Publication Date: 2018-11-23
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this method is relatively complicated, the treatment cost is high, and the salt is not recycled and reused.

Method used

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  • Method for recycling fluorosilicone in high-salt ammonia-nitrogen wastewater and producing sodium fluoride with coproduction of white carbon black

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: A method for producing sodium fluoride using high-salt ammonia-nitrogen waste water, fluorine and silicon as resources:

[0031] The high-salt ammonia nitrogen wastewater in this example includes the following components in mass percentage: 1) 20% ammonium chloride; 2) 25% sodium chloride.

[0032] Utilize high-salt ammonia nitrogen waste water to produce sodium fluoride co-production white carbon black in the present embodiment and comprise the following steps:

[0033] (1) Ammonia nitrogen treatment: Take 1 kg of the above wastewater, add 150g of sodium hydroxide to the wastewater (that is, the mass ratio of sodium chloride to high-salt ammonia nitrogen wastewater is 1:6.67), and enter the ammonia recovery system. Ammonia water is recovered after evaporation; in this step, the ammonium chloride component in the high-salt ammonia nitrogen wastewater reacts with sodium hydroxide to generate 128 g of ammonia water and 214 g of by-product sodium chloride, and t...

Embodiment 2

[0041] Example 2: A method for producing sodium fluoride using high-salt ammonia nitrogen waste water, fluorine and silicon resources:

[0042] The high-salt ammonia nitrogen wastewater in this example includes the following components in mass percentage: 1) 4% ammonium chloride; 2) 5% sodium chloride.

[0043] Utilize high-salt ammonia nitrogen waste water to produce sodium fluoride co-production white carbon black in the present embodiment and comprise the following steps:

[0044] (1) Ammonia nitrogen treatment: Take 1 kg of the above wastewater, add 30 g of sodium hydroxide to the wastewater (that is, the mass ratio of sodium chloride to high-salt ammonia nitrogen wastewater is 1:33.3), enter the ammonia recovery system, and the ammonia nitrogen in the wastewater is passed through Ammonia water is recovered after low-temperature evaporation; in this step, the ammonium chloride component in the high-salt ammonia-nitrogen wastewater reacts with sodium hydroxide to generate 2...

Embodiment 3

[0052] Example 3: A method for producing sodium fluoride using high-salt ammonia-nitrogen waste water, fluorine and silicon resources:

[0053] The high-salt ammonia nitrogen wastewater in this example includes the following components in mass percentage: 1) 12% ammonium chloride; 2) 15% sodium chloride.

[0054] Utilize high-salt ammonia nitrogen waste water to produce sodium fluoride co-production white carbon black in the present embodiment and comprise the following steps:

[0055] (1) Ammonia nitrogen treatment: Take 1 kg of the above wastewater, add 90 g of sodium hydroxide to the wastewater (that is, the mass ratio of sodium hydroxide to high-salt ammonia nitrogen wastewater is 1:11.1), and enter the ammonia recovery system. Recover ammonia water after low-temperature evaporation; in this step, the ammonium chloride component in the high-salt ammonia-nitrogen wastewater reacts with sodium hydroxide to generate 76.8 g of ammonia water and 128 g of by-product sodium chlor...

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Abstract

The invention relates to a method for recycling fluorosilicone in high-salt ammonia-nitrogen wastewater and producing sodium fluoride with coproduction of white carbon black. The method is characterized in that sodium fluoride is produced by taking sodium fluorosilicate and sodium carbonate decahydrate or sodium carbonate as raw materials; sodium carbonate decahydrate is produced by crystallizingsodium carbonate component in high-salt ammonia-nitrogen wastewater; a reaction by-product which is white carbon black is used as a raw material for preparing sodium fluorosilicate; sodium fluorosilicate is generated by taking fluosilicic acid and sodium chloride or sodium sulfate as raw materials through double decomposition reaction; sodium chloride or sodium sulfate is produced by the high-saltammonia-nitrogen wastewater; fluosilicic acid is prepared by reacting acidic fluorine-containing wastewater with the white carbon black; or fluosilicic acid which is a by-product in the phosphate fertilizer industry is directly used. The method has the advantages that fluorosilicone in the high-salt ammonia-nitrogen wastewater is recycled and is used for producing sodium fluoride with coproduction of white carbon black, the contents of ammonia-nitrogen and salt in the wastewater can be greatly reduced, the treatment cost of the wastewater is reduced, the wastewater is reused, the waste is changed into wealth, and the economic benefit is increased.

Description

technical field [0001] The invention relates to a technology for the treatment of high-concentration salt-containing ammonia-nitrogen wastewater and the resource utilization of fluorine and silicon to produce sodium fluoride and co-produce white carbon black, and is especially suitable for the treatment and resource utilization of AC foaming agent wastewater. Background technique [0002] High-concentration salt-containing ammonia nitrogen wastewater is a common industrial wastewater, which is difficult to treat with existing technologies. For example, AC foaming agent produces a large amount of high-concentration saline ammonia nitrogen wastewater, the main components include sodium carbonate, ammonium chloride or / and ammonium sulfate, sodium chloride or / and sodium sulfate. AC blowing agent wastewater is a high concentration of NH 3 -N, high-concentration inorganic salt, high-concentration CODcr wastewater. Its main hazards are: (1) cause eutrophication of water body; (...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01C1/02C01B33/12C02F9/10C02F101/16
CPCC01B33/12C01C1/022C01D3/02C02F1/04C02F1/72C02F9/00C02F2101/16
Inventor 李广利贺全国刘军罗小平
Owner HUNAN UNIV OF TECH
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