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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 which method is used to obtain sodium hypochlorite, a large amount of chemical raw materials and energy consumption will be consumed, resulting in an increase in economic costs.

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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Effect test

Embodiment 1

[0031] Such as figure 1 Shown, a kind of system that prepares sodium hypochlorite with fly ash, comprises washing tank 1, nanofiltration equipment 2, reverse osmosis device 3, electrolysis reactor 4, the first outlet of described washing tank 1 is connected with the inlet of nanofiltration equipment 2 Pass, the first outlet of described nanofiltration equipment 2 is communicated with the inlet of reverse osmosis device 3, and the first outlet of described reverse osmosis device 3 is communicated with the inlet of electrolytic reactor 4, and the first outlet of described washing pool 1 A high-pressure pump 5 is provided, and a stop valve 6 is provided at the second outlet of the water washing tank 1 and the second outlet of the electrolytic reactor 4 .

[0032] Among them, the washing tank 1 is used for washing fly ash, and the fly ash 7 enters the washing tank 1 and an appropriate amount of water is added to adjust the ratio of water: fly ash = 4:1. The stirring rate is 200-2...

Embodiment 2

[0046] Such as figure 2 As shown, as an improvement of the present invention, the nanofiltration device 2 is used to perform nanofiltration treatment on the washing liquid, and the retained liquid after the nanofiltration contains a large amount of divalent ions such as calcium and magnesium ions and sulfate radicals, and can be used as a high salt water Washing the fly ash separately saves the overall water consumption in the washing process. All the other structures and advantages are identical to Embodiment 1.

Embodiment 3

[0048] Such as image 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 again, and the permeate and retentate permeate can be obtained through reverse osmosis treatment, and the retentate is mainly concentrated NaCl and KCl solution, the permeate composition is desalted water 10 that removes soluble salts, and the permeate can be used as desalinated water 10 to wash the fly ash separately, saving water consumption in the washing process. All the other structures and advantages are exactly the same as in Embodiment 2.

[0049] Such as Figure 5 Shown, a kind of method for preparing sodium hypochlorite with fly ash may further comprise the steps:

[0050] Step 1: The content of NaCl in the fly ash is 3%-9.5%. Pour the fly ash into the washing pool 1 and add an appropriate amount of water. The ratio of water and fly ash 7 is 4:1, and the stirring rate of the reac...

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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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