CN114560716B

CN114560716B - Forsterite honeycomb body, preparation method and application thereof

Info

Publication number: CN114560716B
Application number: CN202210309926.3A
Authority: CN
Inventors: 祝洪喜; 汪盛明; 祝道全; 胡莹; 余超; 董博; 魏建国
Original assignee: Wuhan Lichan Environmental Protection Technology Co ltd
Current assignee: Wuhan Lichan Environmental Protection Technology Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-05-23
Anticipated expiration: 2042-03-28
Also published as: CN114560716A

Abstract

The invention provides a forsterite honeycomb body, which comprises the following main ingredients: 90-92 wt% of forsterite fine powder, 5-9 wt% of adsorbent and 1-3 wt% of grease; and (3) auxiliary ingredients: 1.5 to 3.5 weight percent of binding agent A and 1 to 2.5 weight percent of additive B. The invention also provides a preparation method of the forsterite honeycomb body, which comprises the steps of mixing, forming, drying and heat treatment. The invention also provides application of the forsterite honeycomb body, and the forsterite honeycomb body is used for carbon dioxide neutralization and absorption. After the absorbent is mixed with the magnesium oxide of the forsterite, the absorbent is used for rapidly absorbing carbon dioxide, and then the magnesium oxide and the carbon dioxide are chemically solidified, so that the absorption speed is greatly improved on the premise of ensuring the absorption rate; the preparation method used in the invention has the advantages of simple process and low raw material cost, and the prepared forsterite honeycomb has the advantages of large reaction area and good air permeability, and is beneficial to the influence of large-scale industrial production.

Description

Forsterite honeycomb body, preparation method and application thereof

Technical Field

The invention relates to the technical field of carbon dioxide neutralization, in particular to a forsterite honeycomb body, a preparation method and application thereof.

Background

At present, reducing the adverse effect of carbon dioxide CO2 on the environment is an important task in the current environmental protection technology field.

Chemical absorption is widely used in the existing carbon neutralization technology to capture CO2 and then the treatment is carried out. Many treatment techniques are available, such as the sequestration of CO2 into the subsurface formation, or the conversion of CO2 and CO-reactants into target products, to achieve CO2 recycling and carbon neutralization, etc. Wherein, the mineral raw material is used as a reactant to chemically react with CO2 to generate new solid substances to solidify CO2 and realize carbon neutralization, thus being a very good new carbon neutralization technology. The method does not need to discharge other pollution chemicals and consume energy to collect and react, and has the advantages of energy conservation, environmental protection, simplicity and high efficiency.

However, the existing technology for solidifying CO2 by using the solid material has a certain problem, firstly, the reaction rate of absorbing and solidifying carbon dioxide by using the solid mineral is relatively slow, so that the carbon dioxide needs to be circulated for a plurality of times to achieve a relatively good absorption effect, and the production efficiency is reduced; secondly, the surface area of the solid material manufactured at present is not large enough, so that the contact area of the material and CO2 is small, and the reaction rate is low.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides a forsterite honeycomb body, a preparation method and application thereof, which solve the problems that the reaction rate is relatively slow in the prior art, so that better absorption effect can be achieved only by circulating carbon dioxide for many times, and the production efficiency is reduced; and the problem that the solid material has insufficient surface area, so that the contact area of the material and CO2 is small, and the reaction rate is low.

According to an embodiment of the invention, a forsterite honeycomb body comprises the following raw materials:

main ingredients: 90-92 wt% of forsterite fine powder, 5-9 wt% of adsorbent and 1-3 wt% of grease;

and (3) auxiliary ingredients: 1.5 to 3.5 weight percent of binding agent A and 1 to 2.5 weight percent of additive B.

Preferably, the purity of the forsterite fine powder is more than or equal to 36 percent by weight of MgO, and the granularity is less than or equal to 200 meshes.

Preferably, the adsorbent is zeolite or activated carbon powder, and the granularity of the adsorbent is less than or equal to 200 meshes.

Preferably, the fat or oil is an unsaturated fatty acid glyceride which is in a liquid state at ordinary temperature.

Preferably, the binding agent a is polyvinylpyrrolidone.

Preferably, the additive B is silica sol or water glass.

The invention also provides a preparation method of the forsterite honeycomb body, which comprises the following steps:

(1) Mixing: selecting raw materials according to a proportion, adding a proper amount of water, putting into a pugging machine for pugging, storing for 18-24 hours after pugging to prepare a pug suitable for molding, and then putting into a pugging machine for extrusion into pugs for standby;

(2) And (3) forming: putting the mud strip prepared in the step (1) into a molding extruder for extrusion molding to prepare a honeycomb wet blank with a plurality of through holes;

(3) And (3) drying: placing the wet honeycomb body blank into a drying furnace, and drying at 110+/-5 ℃ for 32-48 hours to prepare a green honeycomb body blank;

(4) And (3) heat treatment: placing the honeycomb body green body into a heat treatment furnace, and carrying out heat treatment at 240-320 ℃ for 4-8 hours to prepare the forsterite honeycomb body with a plurality of through holes.

Further, the mass of the water added in the step (1) is 10-12% of the total mass of the raw materials.

In the step (4), the temperature is slowly raised to 240-320 ℃ within 1-2 h at a uniform speed, and then the heat preservation is carried out.

The invention also proposes the use of a forsterite honeycomb for carbon dioxide neutralization and absorption.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the forsterite mineral raw material is mixed with the absorbent such as zeolite and active carbon, and finally calcined to obtain an integrated structure, wherein the absorbent is used for rapidly absorbing a large amount of carbon dioxide in a physical adsorption mode, but absorbed gas is slowly discharged after the absorption is finished;

2. according to the invention, grease is also added into the raw materials, and the surface of the magnesium oxide is modified by the grease, so that the surface activity of the magnesium oxide is improved, and the magnesium oxide can better react with carbon dioxide;

3. the product is manufactured into the shape of the honeycomb body, so that a larger surface area is obtained under the same mass, the contact area of the product and carbon dioxide is increased, and the absorption efficiency is greatly improved;

4. the preparation method used in the invention has the advantages of simple process and low raw material cost, and the prepared forsterite honeycomb has the advantages of large reaction area and good air permeability, and is beneficial to the influence of large-scale industrial production.

Detailed Description

The technical scheme of the invention is further described below by referring to examples.

Example 1:

a forsterite honeycomb in this example, comprising the following raw materials:

main ingredients: 90wt% of forsterite fine powder, 7wt% of adsorbent and 3wt% of grease;

and (3) auxiliary ingredients: 1.5wt% of a binding agent A and 1wt% of an additive B.

In this example, the forsterite powder had a purity of 36% by weight of MgO and a particle size of 200 mesh. The adsorbent is zeolite powder, and the granularity of the adsorbent is 200 meshes. The grease is unsaturated fatty glyceride in liquid state at normal temperature. The binding agent A is polyvinylpyrrolidone. The additive B is silica sol.

(1) Mixing: selecting raw materials according to a proportion, adding water accounting for 10% of the total mass of the raw materials, putting into a pugging machine for pugging, storing for 18 hours after pugging to form a pugging material suitable for molding, and then putting into a pugging machine for extrusion to form pugs for standby;

(3) And (3) drying: placing the wet honeycomb body blank into a drying furnace, and drying at 110+/-5 ℃ for 32 hours to prepare a green honeycomb body blank;

(4) And (3) heat treatment: the green honeycomb body was placed in a heat treatment furnace, slowly heated to 240 ℃ at a uniform rate over 1 hour, and then heat-treated with heat preservation for 8 hours to produce a forsterite honeycomb body having a plurality of through holes.

Example 2:

a forsterite honeycomb in this example, comprising the following raw materials:

main ingredients: 90wt% of forsterite fine powder, 9wt% of adsorbent and 1wt% of grease;

and (3) auxiliary ingredients: 2.5wt% of a binding agent A and 2wt% of an additive B.

In this example, the forsterite powder had a purity of 38% MgO by weight and a particle size of 180 mesh. The adsorbent is powder of active carbon, and the granularity of the adsorbent is 180 meshes. The grease is unsaturated fatty glyceride in liquid state at normal temperature. The binding agent A is polyvinylpyrrolidone. The additive B is water glass.

(1) Mixing: raw materials are selected according to the proportion, water accounting for 11% of the total mass of the raw materials is added and then put into a pugging machine for pugging, pugging is carried out to prepare a pug suitable for molding, and then the pug is stored for 21 hours and then enters into a pugging machine for extrusion into pug strips for standby;

(3) And (3) drying: placing the wet honeycomb body blank into a drying furnace, and drying at 110+/-5 ℃ for 40 hours to prepare a green honeycomb body blank;

(4) And (3) heat treatment: the green honeycomb body was placed in a heat treatment furnace, slowly heated to 280 ℃ at a uniform rate over 1.5h, and then heat-treated with heat preservation for 6h to produce a forsterite honeycomb body having a plurality of through holes.

Example 3:

a forsterite honeycomb in this example, comprising the following raw materials:

main ingredients: 92wt% of forsterite fine powder, 5wt% of adsorbent and 3wt% of grease;

and (3) auxiliary ingredients: 3.5wt% of binding agent A and 2.5wt% of additive B.

In this example, the forsterite powder had a purity of 40% by weight MgO and a particle size of 160 mesh. The adsorbent is powder of active carbon, and the granularity of the adsorbent is 160 meshes. The grease is unsaturated fatty glyceride in liquid state at normal temperature. The binding agent A is polyvinylpyrrolidone. The additive B is silica sol.

(1) Mixing: selecting raw materials according to a proportion, adding water accounting for 12% of the total mass of the raw materials, putting into a pugging machine for pugging, storing for 24 hours after pugging to form a pugging material suitable for molding, and then putting into a pugging machine for extrusion to form pugs for standby;

(3) And (3) drying: placing the wet honeycomb body blank into a drying furnace, and drying at 110+/-5 ℃ for 48 hours to prepare a green honeycomb body blank;

(4) And (3) heat treatment: the green honeycomb body was placed in a heat treatment furnace, slowly heated to 320 c at a uniform rate over 2 hours, and then heat-treated with heat for 4 hours to produce a forsterite honeycomb body having a plurality of through holes.

Comparative example 4:

a forsterite honeycomb in this example, comprising the following raw materials:

main ingredients: 92wt% of forsterite fine powder, 5wt% of quartz and 3wt% of grease;

In this example, the forsterite powder had a purity of 40% by weight MgO and a particle size of 160 mesh. The granularity of the quartz is 160 meshes. The grease is unsaturated fatty glyceride in liquid state at normal temperature. The binding agent A is polyvinylpyrrolidone. The additive B is silica sol.

The preparation method in comparative example 4 was the same as in example 3.

Comparative example 5:

the honeycomb activated carbon produced by Jiangsu Chuangjia new material company is adopted in the embodiment, and the honeycomb structure and the pore diameter are the same as those in the embodiment 1-3.

The products of examples 1 to 3 and comparative examples 4 to 5 were subjected to 3 cycles and 20 cycles, respectively, and then the carbon dioxide absorption rate at the completion of the cycles and after 7 days was examined, respectively, to obtain the results shown in Table 1.

TABLE 1

As can be seen from table 1, compared with comparative example 4 without adding activated carbon absorbent, the product of the present invention has similar absorption rate at high cycle times, but has much higher absorption rate at low cycle times than comparative example 4, which indicates that the present invention can obtain better carbon dioxide absorption effect at relatively lower cycle times, and is beneficial to improving absorption efficiency.

The inventive comparative example 5, which is compared to pure activated carbon adsorption, has an absorptivity greater than that of the inventive product at the time of completion of the cycle, regardless of whether the cycle number is high or low, but the absorptivity of comparative example 5 is greatly reduced after 7 days, indicating that the absorbed carbon dioxide is released therein and stable solidification is not achieved, whereas the inventive product has only a very small variation, indicating that the inventive product can stably solidify carbon dioxide.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims

1. The forsterite honeycomb is characterized by comprising the following raw materials:

and (3) auxiliary ingredients: 1.5 to 3.5 weight percent of binding agent A and 1 to 2.5 weight percent of additive B;

the adsorbent is powder of zeolite or active carbon, and the granularity of the adsorbent is less than or equal to 200 meshes;

the binding agent A is polyvinylpyrrolidone; the additive B is silica sol or water glass.

2. The forsterite honeycomb of claim 1, wherein: the purity of the forsterite fine powder is that MgO is more than or equal to 36wt percent, and the granularity is less than or equal to 200 meshes.

3. The forsterite honeycomb of claim 1, wherein: the grease is unsaturated fatty glyceride in liquid state at normal temperature.

4. A process for the preparation of a forsterite honeycomb as claimed in any one of claims 1 to 3, characterised by the steps of:

5. The method of producing a forsterite honeycomb according to claim 4, wherein: the mass of the water added in the step (1) is 10-12% of the total mass of the raw materials.

6. The method of producing a forsterite honeycomb according to claim 4, wherein: in the step (4), the temperature is slowly raised to 240-320 ℃ within 1-2 h at a uniform speed, and then the heat preservation is carried out.

7. Use of a forsterite honeycomb body according to any one of claims 1 to 3, characterized in that: the forsterite honeycomb is used for carbon dioxide neutralization and absorption.