阅读说明：本技术 一种多孔石英陶瓷过滤材料的制备方法 (Preparation method of porous quartz ceramic filter material ) 是由 郑海 唐明亮 胡增涵 王海华 程尚栩 于 2020-12-21 设计创作，主要内容包括：本发明公开了一种多孔石英陶瓷过滤材料的制备方法,具体内容为：高纯石英砂为原料,硅烷偶联剂为表面改性剂,配置硅烷偶联剂乙醇溶液,将硅烷偶联剂乙醇溶液以雾状形式喷到高速搅拌的石英砂中,搅拌干燥得到表面改性后的石英砂；硅溶胶为粘结剂,将表面改性的石英砂与硅溶胶水溶液搅拌均匀,进行造粒,得到一定粒度的造粒料；造粒料通过压制成型制备多孔石英陶瓷坯体,将坯体进行1100-1300℃煅烧,得到多孔石英陶瓷过滤材料。本发明制备的多孔石英陶瓷过滤材料,结构强度高不易损坏,开气孔多且分布均匀,水通量高。(The invention discloses a preparation method of a porous quartz ceramic filter material, which comprises the following specific contents: preparing a silane coupling agent ethanol solution by using high-purity quartz sand as a raw material and a silane coupling agent as a surface modifier, spraying the silane coupling agent ethanol solution into the quartz sand stirred at a high speed in a mist form, and stirring and drying to obtain quartz sand with a modified surface; silica sol is used as a binder, quartz sand with modified surface and silica sol water solution are uniformly stirred and granulated to obtain a granulated material with certain granularity; the granules are pressed and formed to prepare a porous quartz ceramic blank, and the blank is calcined at 1100-1300 ℃ to obtain the porous quartz ceramic filter material. The porous quartz ceramic filter material prepared by the invention has high structural strength, is not easy to damage, has more open pores, is uniformly distributed, and has high water flux.)

1. A preparation method of a porous quartz ceramic filter material comprises the following specific steps:

(1) preparing a surface modifier solution: the silane coupling agent is vinyl triethoxysilane, the PH is adjusted to 5 by acetic acid, and a silane coupling agent ethanol solution with the mass concentration of 15-35% is prepared;

(2) quartz sand surface modification treatment: spraying a silane coupling agent ethanol solution into the quartz sand which is stirred at a high speed in a mist form, stirring and drying to obtain quartz sand with a modified surface;

(3) and (3) granulation: silica sol is used as a binder, quartz sand with modified surface and silica sol water solution are uniformly stirred and granulated to obtain a granulated material with certain granularity;

(4) molding and calcining: and pressing the granulated material under certain pressure to prepare a porous quartz ceramic blank, and drying and calcining the blank to obtain the porous quartz ceramic filter material.

2. The method for preparing a porous quartz ceramic filter material according to claim 1, wherein: the purity of the quartz sand is more than 99.99 percent, and the particle size distribution is 100-150 mu m.

3. The method for preparing a porous quartz ceramic filter material according to claim 1, wherein: the adhesive is silica sol, and the concentration of the silica sol aqueous solution is 15-30%.

4. The method for preparing a porous quartz ceramic filter material according to claim 1, wherein: the grain size of the granulating material is 0.3-0.5 mm.

5. The method for preparing a porous quartz ceramic filter material according to claim 1, wherein: the calcination temperature of the green body is 1100-1300 ℃, the heating rate is 2-4 ℃/min, and the heat preservation time is 120-180 min.

Technical Field

The invention relates to a preparation method of quartz ceramic, in particular to a preparation method of porous quartz ceramic.

Background

The porous ceramic is used as a novel ceramic functional material, combines the excellent properties of the porous material and the ceramic material, and has the advantages of stable chemical property, high-temperature corrosion resistance, long continuous working time, high porosity, good filtering efficiency and the like when being applied to a water treatment process. At present, the forming mode of porous ceramics for water purification treatment in China is mainly slip casting, and various pore-forming agents, clay and other bonding agents are added to increase the water passing amount and improve the strength. The porous ceramic for water treatment prepared by slip casting has the aperture of 0.2-10 mu m and the porosity of approximately 30-65 percent, and although the porous ceramic can efficiently intercept particulate matters and most microorganisms, the water flux is lower, thereby further influencing the service performance.

The porous quartz ceramic filter material prepared by the compression molding process has high structural strength and high open pore rate, and can entrap particulate matters and most microorganisms while improving water flux.

Disclosure of Invention

The invention aims to provide a preparation method of porous quartz ceramic, and solves the problem of controlling the pore structure and distribution of the porous quartz ceramic.

The technical problem to be solved by the invention is realized by the following technical scheme, and the invention relates to a preparation method of a porous quartz ceramic filter material, which comprises the following steps:

(1) preparing a surface modifier solution: the silane coupling agent is vinyl triethoxysilane, the PH is adjusted to 5 by acetic acid, and a silane coupling agent ethanol solution with the mass concentration of 15-35% is prepared;

(2) quartz sand surface modification treatment: the purity of the raw material quartz sand is more than 99.99 percent, the particle size distribution is 100-150 mu m, the silane coupling agent ethanol solution is sprayed into the quartz sand which is stirred at high speed in a fog form, and the quartz sand is continuously stirred and dried to obtain the quartz sand with the modified surface;

(3) and (3) granulation: taking silica sol as a binder, wherein the concentration of the silica sol aqueous solution is 15-30%, uniformly stirring the surface-modified quartz sand and the silica sol aqueous solution, and granulating to obtain granules with the size of 0.3-0.5 mm;

(4) molding and calcining: and pressing the granulated material under a certain pressure to prepare a porous quartz ceramic blank, and drying the blank at 80 ℃ and calcining at 1300 ℃ for 120-180 min to obtain the porous quartz ceramic filter material.

The invention has the beneficial effects that: the high-purity quartz sand is used as a raw material, so that the stability and the safety of the porous quartz ceramic filter material in the using process are ensured; because the surface of the quartz sand is barren, the silane coupling agent vinyl triethoxysilane is adopted for surface modification treatment, so that the dispersibility and uniformity of the quartz sand are improved; the silica sol is used as a binder, is homologous with quartz sand, and is used for granulating the quartz sand, so that the flowability of powder and the stacking density in the compression molding process are improved, and the density and the structural strength of the porous quartz ceramic filter material are improved; the vinyltriethoxysilane and the silica sol also play a role of a pore-forming agent, and the vinyltriethoxysilane is gradually decomposed and volatilized in the calcining process to leave a large number of pores in the quartz ceramic; a large number of micelles in the silica sol generate a large number of network gaps, and the network gaps are adsorbed on the surface of the quartz sand to form a plurality of pores, so that the porosity of the quartz ceramic is improved.

Detailed Description

Specific embodiments of the present invention will now be further described to facilitate further understanding of the present invention by those skilled in the art, and are not to be construed as limiting the claims thereto.

(1) Preparing a surface modifier solution: the silane coupling agent is vinyl triethoxysilane, the PH value is adjusted to 5 by acetic acid, and a silane coupling agent ethanol solution with the mass concentration of 30% is prepared;

(2) quartz sand surface modification treatment: the purity of the raw material quartz sand is more than 99.99 percent, the granularity is 100-150 mu m, the silane coupling agent ethanol solution is sprayed into the quartz sand which is stirred at high speed in a fog form, the stirring is continued for 1 h, and the drying is carried out for 2 h at the temperature of 80 ℃ to obtain the quartz sand after the surface modification;

(3) and (3) granulation: taking silica sol as a binder, wherein the concentration of the silica sol aqueous solution is 20%, uniformly stirring the surface-modified quartz sand and the silica sol aqueous solution, and granulating to obtain a granulated material with the particle size of 0.3-0.5 mm;

(4) molding and calcining: and pressing the granulated material under certain pressure to prepare a porous quartz ceramic blank, drying the blank at 80 ℃, heating to 1100 ℃ at a heating rate of 2 ℃/min, calcining, and preserving heat for 120 min to obtain the porous quartz ceramic filter material.