Method and system for preparing sodium hypochlorite from fly ash

A technology of sodium hypochlorite and fly ash, which is applied in the field of fly ash treatment, can solve the problems of rising economic costs, large chemical raw materials, energy consumption, and consumption, and achieve the effects of water saving, environmental friendliness, and high resource utilization

Pending Publication Date: 2021-01-01
TIANJIN ENEW ENVIRONMENTAL PROTECTION ENGCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial method for preparing sodium hypochlorite is to absorb chlorine gas with sodium hydroxide, or to directly electrolyze sodium chloride solution. No matter whic

Method used

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  • Method and system for preparing sodium hypochlorite from fly ash
  • Method and system for preparing sodium hypochlorite from fly ash
  • Method and system for preparing sodium hypochlorite from fly ash

Examples

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Example Embodiment

[0030]Example 1:

[0031]Such asfigure 1 As shown, a system for preparing sodium hypochlorite from fly ash includes a washing tank 1, a nanofiltration device 2, a reverse osmosis device 3, and an electrolysis reactor 4. The first outlet of the washing tank 1 is connected to the inlet of the nanofiltration device 2. The first outlet of the nanofiltration device 2 is in communication with the inlet of the reverse osmosis device 3, the first outlet of the reverse osmosis device 3 is in communication with the inlet of the electrolysis reactor 4, and the first outlet of the water washing tank 1 A high-pressure pump 5 is provided, and the second outlet of the water washing tank 1 and the second outlet of the electrolysis reactor 4 are both provided with a stop valve 6.

[0032]The washing tank 1 is used to wash the fly ash, and the fly ash 7 enters the washing tank 1 and adding an appropriate amount of water. The adjustment ratio is water: fly ash=4:1. The stirring rate is 200-250r / min. The con...

Example Embodiment

[0045]Example 2:

[0046]Such asfigure 2 As shown, as an improvement of the present invention, the nanofiltration device 2 is used to perform nanofiltration treatment on the washing liquid. The retentate after nanofiltration contains a large amount of calcium and magnesium ions and divalent ions such as sulfate, which can be used as high salt water. The fly ash is washed separately, which saves the overall water consumption in the washing process. The rest of the structure and advantages are exactly the same as the first embodiment.

Example Embodiment

[0047]Example 3:

[0048]Such asimage 3 As shown, as an improvement of the present invention, the reverse osmosis device 3 is used to perform reverse osmosis treatment on the solution after nanofiltration. Through the reverse osmosis treatment, permeate and retentate permeate can be obtained, and the retentate is mainly concentrated NaCl With the KCl solution, the permeate component is desalinated water 10 that removes soluble salts. The permeate can be used as desalinated water 10 to wash the fly ash separately, saving water in the washing process. The rest of the structure and advantages are exactly the same as in the second embodiment.

[0049]Such asFigure 5As shown, a method for preparing sodium hypochlorite from fly ash includes the following steps:

[0050]Step 1: The content of NaCl in the fly ash is 3%-9.5%. Pour the fly ash into washing tank 1 and add an appropriate amount of water. The ratio of water to fly ash 7 is 4:1, and the reaction stirring rate is 200- 250r / min, 80% of NaCl...

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Abstract

The invention discloses a system for preparing sodium hypochlorite from fly ash. The system comprises a water washing pool, nanofiltration equipment, a reverse osmosis device and an electrolysis reactor, a first outlet of the water washing pool is communicated with an inlet of the nanofiltration equipment, and a first outlet of the nanofiltration equipment is communicated with an inlet of the reverse osmosis device, and a first outlet of the reverse osmosis device is communicated with an inlet of the electrolysis reactor. The system has the beneficial effects that the elution concentration ofsodium chloride in the fly ash is high, sodium hypochlorite is obtained through reaction of chlorine obtained through electrolysis and a sodium hydroxide solution, other chemical agents do not need tobe added, and the system has the characteristics of being high in resource utilization rate and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of fly ash treatment methods, in particular to a method and system for preparing sodium hypochlorite from fly ash. Background technique [0002] Combustion fly ash is the residue collected in the flue gas purification system and heat recovery system during the disposal of municipal waste, accounting for about 20% of the total waste incineration ash. The moisture content of fly ash is extremely low, between 10% and 20%, and it is in the form of light gray powder with a particle size of less than 100um. Fly ash is mainly composed of SiO 2 , Fe 2 o 3 、Al 2 o 3 Mainly, it also contains a large amount of NaCl, KCl and so on. [0003] Sodium hypochlorite is an important oxidizing agent and bleaching agent, which is widely used in many industries such as printing and dyeing, pharmaceuticals, and agriculture. The industrial method for preparing sodium hypochlorite is to absorb chlorine gas with sodium hydroxi...

Claims

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Application Information

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IPC IPC(8): C25B1/26C25B15/08B01D11/02B01D61/58
CPCC25B1/26C25B15/08B01D11/0257B01D11/0288B01D61/026
Inventor 王学科张春苗焦海亮穆童王纯
Owner TIANJIN ENEW ENVIRONMENTAL PROTECTION ENGCO LTD
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