CN103396000B - A kind of take zeolite as high-intensity foam glass of preparing of pore-forming material and preparation method thereof - Google Patents

Abstract

The invention discloses a high-strength foam glass prepared by using zeolite as a pore-forming agent and a preparation method thereof. The base material waste glass powder, zeolite, flux, and foam stabilizer are mixed according to a certain composition, and the prepared raw materials are put into a ball mill for dry grinding, then granulated, pressed and formed, and then heat treated at 750 ° C to 900 ° C , and finally made of high-strength foam glass material. The invention directly uses the gas and moisture adsorbed in the zeolite cavity to be released during heat treatment to form a large number of pores in the glass, and meanwhile uses the remaining fibrous zeolite grains to strengthen the glass matrix. The invention has the characteristics of simple preparation process, low firing temperature, high strength of foam glass and the like.

Description

A kind of high-strength foam glass prepared by using zeolite as a pore-forming agent and its preparation method

technical field

The invention relates to the technical field of ceramic material preparation, in particular to a high-strength foam glass prepared by using zeolite as a pore-forming agent and a preparation method thereof.

Background technique

Foam glass not only has the advantages of heat insulation, sound absorption, non-combustion, no mildew, no rot, air-tightness, and no water absorption, but also has the characteristics of good chemical stability and resistance to cold and heat shocks. Because foam glass is durable, safe and reliable, it occupies an increasingly important position in the fields of low thermal insulation, moisture-proof engineering, and sound absorption and noise reduction. In foreign countries, foam glass is also widely used in the external and internal walls of buildings instead of cement, steel and concrete, the purpose of which is to absorb the shock waves generated by explosions or earthquakes. However, the strength of ordinary foam glass is not high, which greatly limits its application in construction and other aspects. The development of high-strength foam glass has become a research hotspot of foam glass. There are many kinds of foam glass products at home and abroad. The raw materials used are mostly discarded bottle glass, flat glass, industrial waste such as slag, and natural minerals such as mica, perlite, pumice powder, and volcanic ash. Using these raw materials to prepare high-performance cellular glass can utilize waste, reduce costs, protect the environment, and have great economic and social benefits.

At present, the pore-forming agents used to prepare foam glass at home and abroad can be divided into two types: redox-type pore-forming agents and decomposition-type pore-forming agents: redox-type pore-forming agents mainly include carbon black, silicon carbide, graphite, etc., these pore-forming agents The decomposition temperature of the glass powder often has a poor match with the initial melting temperature of the general glass powder base material, and it is difficult to obtain an ideal product; the decomposition pore-forming agents mainly include carbonates, sulfates, nitrates, organic matter, hydrogen peroxide, etc. Due to their own characteristics and the effect of decomposition products, the thickness of the cell wall of the obtained foam glass is uneven, and it is easy to form a connected structure. Therefore, the strength of the foam glass prepared with these traditional pore-forming agents is generally not high, and it is difficult to meet the requirements of the construction field.

The reserves of zeolite rocks in my country are quite abundant, covering more than 20 provinces, municipalities and autonomous regions across the country. Because its space grid structure is full of cavities and channels, there are gas inclusions, which can play a role in creating zeolite under heating conditions. The role of the porosity agent. At present, there is no report on the method of preparing foam glass by powder sintering and foaming process using zeolite as pore-forming agent and waste glass powder as base material.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-strength foam glass prepared by using zeolite as a pore-forming agent with simple process, low raw material cost and high product strength and its preparation method.

In order to solve the above technical problems, the technical solution of the present invention is: a high-strength foam glass prepared by using zeolite as a pore-forming agent, which is characterized in that: waste glass powder is used as a base material, zeolite is used as a pore-forming agent, and then an auxiliary Flux and foam stabilizer, put them into a ball mill for dry grinding, then granulate, press and shape, and then conduct heat treatment, and finally make high-strength foam glass.

The flux is one of sodium fluorosilicate and borax.

The flux is borax.

The foam stabilizer is one of trisodium phosphate, iron oxide and antimony trioxide.

The foam stabilizer is trisodium phosphate.

The flexural strength of the high-strength cellular glass is >2.5MPa, and the volume density is ≤0.7g/cm ³ .

The preparation method of above-mentioned high-strength cellular glass is characterized in that comprising the following steps:

① The base material waste glass powder, zeolite, flux and foam stabilizer are mixed according to a certain formula, and then put into a ball mill for dry grinding;

②The ingredients after ball milling are granulated, and then dry-pressed with a press;

③The pressed samples are heat treated, and finally cut and polished to obtain high-strength foam glass materials.

The formula of the ingredients is 60wt%-90wt% of waste glass powder, 10wt%-40wt% of zeolite, 3wt%-8wt% of flux and 1wt%-5wt% of foam stabilizer.

The pressure of the dry pressing is 4MPa-15MPa.

The heat treatment system is as follows: the heating rate is 5° C./min to 15° C./min, the heat treatment temperature is 750° C. to 900° C., and the holding time is 20 minutes to 120 minutes.

The present invention abandons the redox-type pore-forming agent and decomposition-type pore-forming agent (such as fly ash, calcium carbonate, sodium carbonate, etc.) commonly used in the tradition, and innovatively directly utilizes a large amount of gas inclusions contained in the zeolite framework structure During the heating process, it escapes to form holes; at the same time, it also uses the fibrous zeolite grains remaining in the foam glass to strengthen the glass matrix. The preparation process of the invention is simple, the firing temperature is low, and the prepared foam glass not only has uniform pores and small volume density, but also has the advantages of high strength.

Description of drawings

Fig. 1 is a process flow chart of the present invention for preparing high-strength cellular glass with zeolite as a pore-forming agent.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

Weigh 16g of waste glass powder, 4g of zeolite powder, 1g of flux borax, and 0.4g of foam stabilizer trisodium phosphate, put it into a ball mill for dry grinding, then granulate, press and shape, and the molding pressure is 10MPa, and then follow the following system Heat treatment: raise the temperature from room temperature to 400°C at 5°C/min, and keep it for 30 minutes, then raise the temperature from 400°C to 810°C at 12°C/min, and hold it for 35 minutes, and finally obtain a flexural strength of 3 MPa and a bulk density High-strength cellular glass of 0.4g/cm ³ .

Example 2

Take by weighing waste glass powder 18g, zeolite powder 2g, fluxing agent borax 0.6g, foam stabilizer trisodium phosphate 1g, then carry out ball milling, granulation, compression molding and heat treatment, its technological parameter is identical with embodiment 1, finally obtains anti- High-strength cellular glass with a folding strength of 3.5 MPa and a bulk density of 0.3 g/cm ³ .

Example 3

Take by weighing waste glass powder 12g, zeolite powder 8g, fluxing agent borax 1.6g, foam stabilizer trisodium phosphate 0.2g, then carry out ball milling, granulation, compression molding and heat treatment, its technological parameter is identical with embodiment 1, finally obtains High-strength cellular glass with a flexural strength of 3.6 MPa and a bulk density of 0.6 g/cm ³ .

Example 4

Weigh 16g of waste glass powder, 4g of zeolite powder, 1g of fluxing agent sodium fluorosilicate, and 0.4g of foam stabilizer iron oxide, put them into a ball mill for dry grinding for 2min, then granulate and press to form, the forming pressure is 8MPa, and then Carry out heat treatment according to the following system: heat up from room temperature to 400°C at 8°C/min, and keep it for 30 minutes, then raise the temperature from 400°C to 770°C at 14°C/min, and hold it for 80 minutes, and finally obtain a flexural strength of 3.8 MPa , High-strength cellular glass with a bulk density of 0.3g/cm ³ .

Example 5

Take by weighing 15g of waste glass powder, 5g of zeolite powder, 1.6g of fluxing agent sodium fluorosilicate, 0.8g of foam stabilizer antimony trioxide, put it into a ball mill for dry grinding, then granulate, press and form, and the forming pressure is 14MPa, Then heat treatment is carried out, the heat treatment system is the same as in Example 1, and finally a high-strength cellular glass with a flexural strength of 4.2 MPa and a bulk density of 0.2 g/cm ³ is obtained.

Listed above is only the preferred embodiment of the high-strength cellular glass of the present invention and its preparation method, certainly can not limit the scope of rights of the present invention with this, therefore the equivalent change done according to the patent scope of the present invention, still belongs to scope covered by the present invention.

Claims (9)

1. A high-strength foam glass prepared with zeolite as a pore-forming agent, characterized in that: using waste glass powder as a base material, using zeolite as a pore-forming agent, and then introducing a flux and a foam stabilizer, and putting them into a ball mill Medium-dry grinding, then granulation, compression molding, and then heat treatment, and finally high-strength foam glass; The heat treatment system is as follows: the heating rate is 5° C./min to 15° C./min, the heat treatment temperature is 750° C. to 900° C., and the holding time is 20 minutes to 120 minutes. 2. The high-strength cellular glass according to claim 1, characterized in that: the flux is one of sodium fluorosilicate and borax. 3. The high-strength foam glass according to claim 2, characterized in that: the flux is borax. 4. The high-strength foam glass according to claim 1, characterized in that: the foam stabilizer is one of trisodium phosphate, iron oxide, and antimony trioxide. 5. The high-strength foam glass according to claim 4, characterized in that: the foam stabilizer is trisodium phosphate. 6. The high-strength foam glass according to claim 1, characterized in that: the high-strength foam glass has a flexural strength > 2.5 MPa, and a bulk density ≤ 0.7 g/cm ³ . 7. According to the preparation method of the arbitrary described high-strength cellular glass of claim 1-6, it is characterized in that comprising the following steps: ① The base material waste glass powder, zeolite, flux and foam stabilizer are mixed according to a certain formula, and then put into a ball mill for dry grinding; ②The ingredients after ball milling are granulated, and then dry-pressed with a press; ③The pressed samples are heat treated, and finally cut and polished to obtain high-strength foam glass materials. 8. The preparation method according to claim 7, characterized in that: the formula of the ingredients is 60wt% to 90wt% of waste glass powder, 10wt% to 40wt% of zeolite, 3wt% to 8wt% of flux, and 1wt of foam stabilizer %~5wt%. 9. The preparation method according to claim 7, characterized in that: the pressure of the dry pressing is 4MPa-15MPa.