CN113683173A

CN113683173A - Method for synthesizing ph regulator by using fly ash

Info

Publication number: CN113683173A
Application number: CN202111009722.XA
Authority: CN
Inventors: 吴鹏; 刘敏; 韩华锋; 郭滔; 殷延文
Original assignee: Guoneng Zheneng Ningdong Power Generation Co ltd
Current assignee: Guoneng Zheneng Ningdong Power Generation Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-23
Anticipated expiration: 2041-08-31
Also published as: CN113683173B

Abstract

The application discloses a method for synthesizing a ph regulator by using fly ash, which comprises the steps of fully grinding and mixing the fly ash and calcium carbonate, placing the mixture in a crucible, and roasting in a muffle furnace; adding deionized water into the roasted product, stirring at the stirring speed of 450-880 r/min for 0.5-5 h, and placing the stirred mixture in a reaction kettle for static crystallization; and finally, adding the crystallized product into the wastewater for adjusting the pH value of the wastewater, wherein the ratio of the addition amount of the crystallized product to the wastewater is 1: (50-200). Therefore, the method uses the solid wastes of the power plant to directly synthesize the ph regulator for regulating the ph value of the wastewater, can achieve the purpose of preparing the wastewater by using the wastes, does not need to purchase a large amount of materials, can reduce the cost, has higher safety, has bidirectionality, and can realize the regulation purpose of the ph value of the wastewater by using the ph regulator for both acidic waste liquid and alkaline waste liquid.

Description

Method for synthesizing ph regulator by using fly ash

Technical Field

The application relates to the field of wastewater treatment, in particular to a method for synthesizing a ph regulator by using fly ash.

Background

The main component of the fly ash is SiO₂And Al₂O₃The method can obtain a large amount of active Si and Al through pretreatment, can synthesize the molecular sieve by using the active Si and Al, and can combine acid sites in the synthesized molecular sieve with partial ions in the wastewater, and the acid sites can gradually release hydrogen ions or hydroxide ions after combining the ions in the wastewater, thereby achieving the purpose of adjusting the pH value.

In the prior art, the pH value of the wastewater is mainly adjusted by adding industrial hydrochloric acid or industrial sodium hydroxide into the wastewater. However, not only does industrial acids and bases require substantial material costs, but industrial acids and bases also present certain hazards during storage and use.

Disclosure of Invention

The application provides a method for synthesizing a ph regulator by using fly ash, which solves the problems of high cost of a large amount of materials and low safety of the traditional wastewater ph value regulation mode in the prior art.

In order to solve the technical problem, the application provides a method for synthesizing a ph regulator by using fly ash, which comprises the following steps:

mixing fly ash and calcium carbonate in a ratio of (1-100): (1-100), fully grinding and mixing, placing the mixture in a crucible, and roasting in a muffle furnace;

adding deionized water into the roasted product, stirring for 0.5-5 h at the stirring speed of 450-880 r/min, and placing the stirred mixture into a reaction kettle for static crystallization, wherein the solid-to-liquid ratio of the roasted product to the deionized water is 1: 1-1: 100, the crystallization temperature is 160-200 ℃, and the crystallization time is 1-4 d;

adding the crystallized product into wastewater for adjusting the pH value of the wastewater, wherein the ratio of the addition amount of the crystallized product to the wastewater is 1: (50-200).

Preferably, the mass ratio of the fly ash to the calcium carbonate is 1: 10.

preferably, the roasting temperature of the muffle furnace is 700-1000 ℃; the roasting time is 0.5-5 h.

Preferably, before the static crystallization of the stirred mixture in the reaction kettle, the method further comprises the following steps:

aging for 5-24 h at 60-120 ℃.

Preferably, the addition of the crystallized product to the wastewater is used for adjusting the ph value of the wastewater to be:

when the ph value is 7, the crystallized product added to the wastewater is filtered.

Compared with the prior art, the method for synthesizing the ph regulator by using the fly ash provided by the application comprises the following steps of (1-100): (1-100), fully grinding and mixing, placing the mixture in a crucible, and roasting in a muffle furnace; and then adding deionized water into the roasted product, stirring for 0.5-5 h at a stirring speed of 450-880 r/min, and placing the stirred mixture into a reaction kettle for static crystallization, wherein the solid-liquid ratio of the roasted product to the deionized water is 1: 1-1: 100, the crystallization temperature is 160-200 ℃, and the crystallization time is 1-4 d; and finally, adding the crystallized product into the wastewater for adjusting the pH value of the wastewater, wherein the ratio of the addition amount of the crystallized product to the wastewater is 1: (50-200). Therefore, the method uses the solid wastes of the power plant to directly synthesize the ph regulator for regulating the ph value of the wastewater, can achieve the purpose of preparing the wastewater by using the wastes, does not need to purchase a large amount of materials, can reduce the cost, has higher safety, has bidirectionality, and can realize the regulation purpose of the ph value of the wastewater by using the ph regulator for both acidic waste liquid and alkaline waste liquid.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without making any inventive changes.

FIG. 1 is a flow chart of a method for synthesizing a ph adjusting agent from fly ash according to an embodiment of the present invention.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings.

The core of the application is to provide a method for synthesizing the ph regulator by using fly ash, which can solve the problems of high cost of bulk materials and low safety of the traditional wastewater ph value regulation mode in the prior art.

Fig. 1 is a flow chart of a method for synthesizing a ph regulator from fly ash according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:

s101: mixing fly ash and calcium carbonate in a ratio of (1-100): (1-100), sufficiently grinding and mixing, placing the mixture in a crucible, and roasting in a muffle furnace.

S102: adding deionized water into the roasted product, stirring for 0.5-5 h at a stirring speed of 450-880 r/min, and placing the stirred mixture into a reaction kettle for static crystallization, wherein the solid-to-liquid ratio of the roasted product to the deionized water is 1: 1-1: 100, the crystallization temperature is 160-200 ℃, and the crystallization time is 1-4 d.

S103: adding the crystallized product into the wastewater for adjusting the pH value of the wastewater, wherein the ratio of the addition amount of the crystallized product to the wastewater is 1: (50-200). The crystallized product is a solid-liquid mixture.

As a preferred embodiment, the mass ratio of fly ash to calcium carbonate is 1: 10. the roasting temperature of the muffle furnace is 700-1000 ℃; the roasting time is 0.5-5 h. As a preferred embodiment, before the static crystallization of the stirred mixture in the reaction kettle, the method further comprises the following steps:

aging for 5-24 h at 60-120 ℃. As a preferred embodiment, the crystallized product is added to the wastewater for adjusting the ph value of the wastewater to: when the ph value is 7, the crystallized product added to the wastewater is filtered. After the pH value regulator is added, the acidic wastewater or the alkaline wastewater is alkaline, and then the wastewater is placed for a period of time, the pH value tends to be neutral, and the crystallized product added into the wastewater needs to be filtered when the pH value is about 7. The method has the characteristics of cost reduction, efficiency improvement, safety and environmental protection.

In order to make the technical solution better understood by those skilled in the art, the following detailed description is given with specific examples:

example 1

According to the mass ratio of CaCO 3: 1: 10, putting 1g of CaCO3 and 10g of fly ash into an agate mortar for grinding and mixing, putting into a crucible for roasting, cooling to room temperature, grinding again, adding high-purity water into a roasted product, stirring, putting into a reaction kettle for aging, crystallizing at 180 ℃, cooling to room temperature, and simultaneously adding a solid product and a liquid product of the crystallized product into wastewater. The initial ph of the wastewater was 3.3, the ph was 9.8 after adding the synthetic ph adjusting agent, and the ph was 7.6 after standing for 3 days. At this time, the wastewater was filtered through filter paper to separate the solid phase of the synthesized ph adjustor.

Example 2

According to the mass ratio of CaCO 3: 3 of fly ash: and 7, putting 3g of CaCO3 and 7g of fly ash into an agate mortar for grinding and mixing, putting into a crucible for roasting, cooling to room temperature, grinding again, adding high-purity water into a roasted product, stirring, putting into a reaction kettle for aging, crystallizing at 180 ℃, cooling to room temperature, and simultaneously adding a solid product and a liquid product of the crystallized product into the wastewater. The initial ph of the wastewater was 3.4, the ph was 10.3 after adding the synthetic ph adjusting agent, and the ph was 7.8 after standing for 3 days. At this time, the wastewater was filtered through filter paper to separate the solid phase of the synthesized ph adjustor.

Example 3

According to the mass ratio of CaCO 3: 3 of fly ash: and 7, putting 3g of CaCO3 and 7g of fly ash into an agate mortar for grinding and mixing, putting into a crucible for roasting, cooling to room temperature, grinding again, adding high-purity water into a roasted product, stirring, putting into a reaction kettle for aging, crystallizing at 180 ℃, cooling to room temperature, and simultaneously adding a solid product and a liquid product of the crystallized product into the wastewater. The initial ph of the wastewater is 9.8, the ph value is 10.8 after the synthetic ph regulator is added, and the ph value is 8.1 after the wastewater is placed for 3 days. At this time, the wastewater was filtered through filter paper to separate the solid phase of the synthesized ph adjustor.

Example 4

According to the mass ratio of CaCO 3: 2, coal ash: and 8, putting 2g of CaCO3 and 8g of fly ash into an agate mortar for grinding and mixing, putting into a crucible for roasting, cooling to room temperature, grinding again, adding high-purity water into a roasted product, stirring, putting into a reaction kettle, crystallizing at 170 ℃, cooling to room temperature, and simultaneously adding a solid product and a liquid product of the crystallized product into the wastewater. The initial ph of the wastewater was 3.4, the ph was 9.1 after adding the synthetic ph adjusting agent, and the ph was 7.7 after standing for 3 days. At this time, the wastewater was filtered through filter paper to separate the solid phase of the synthesized ph adjustor.

The method for synthesizing the ph regulator by using the fly ash comprises the following steps of (1-100): (1-100), fully grinding and mixing, placing the mixture in a crucible, and roasting in a muffle furnace; and then adding deionized water into the roasted product, stirring for 0.5-5 h at a stirring speed of 450-880 r/min, and placing the stirred mixture into a reaction kettle for static crystallization, wherein the solid-liquid ratio of the roasted product to the deionized water is 1: 1-1: 100, the crystallization temperature is 160-200 ℃, and the crystallization time is 1-4 d; and finally, adding the crystallized product into the wastewater for adjusting the pH value of the wastewater, wherein the ratio of the addition amount of the crystallized product to the wastewater is 1: (50-200). Therefore, the method uses the solid wastes of the power plant to directly synthesize the ph regulator for regulating the ph value of the wastewater, can achieve the purpose of preparing the wastewater by using the wastes, does not need to purchase a large amount of materials, can reduce the cost, has higher safety, has bidirectionality, and can realize the regulation purpose of the ph value of the wastewater by using the ph regulator for both acidic waste liquid and alkaline waste liquid.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.

Claims

1. A method for synthesizing a ph regulator from fly ash, comprising:

fully grinding and mixing the fly ash and the calcium carbonate according to the mass ratio of (1-100) to (1-100), placing the mixture in a crucible, and roasting in a muffle furnace;

adding deionized water into the roasted product, stirring for 0.5-5 h at the stirring speed of 450-880 r/min, and placing the stirred mixture into a reaction kettle for static crystallization, wherein the solid-liquid ratio of the roasted product to the deionized water is 1: 1-1: 100, the crystallization temperature is 160-200 ℃, and the crystallization time is 1 d-4 d;

and adding the crystallized product into the wastewater to adjust the pH value of the wastewater, wherein the ratio of the addition amount of the crystallized product to the wastewater is 1: 50-200.

2. The method for synthesizing a ph adjusting agent by using fly ash as claimed in claim 1, wherein the mass ratio of the fly ash to the calcium carbonate is 1: 10.

3. The method for synthesizing the ph regulator by using the fly ash as claimed in claim 1, wherein the roasting temperature of the muffle furnace is 700-1000 ℃; the roasting time is 0.5-5 h.

4. The method for synthesizing a ph adjusting agent by using fly ash as claimed in claim 1, further comprising, before the static crystallization of the stirred mixture in the reaction kettle:

aging for 5-24 h at 60-120 ℃.

5. The method for synthesizing a ph regulator by using fly ash as claimed in claim 1, wherein the adding the crystallized product to wastewater for regulating the ph value of wastewater is: