阅读说明：本技术 利用叶蜡石矿渣研制的英固溶体和k-石英固溶体低膨胀微晶玻璃及其制备方法 (Low-expansion microcrystalline glass developed by pyrophyllite slag and prepared from quartz solid solution and K-quartz solid solution and preparation method thereof ) 是由 苏月斌 乔旭升 胡天 樊先平 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种利用叶蜡石矿渣研制含β-石英固溶体和K-石英固溶体低膨胀率微晶玻璃及其制备方法,制备时按质量份数分别称量叶蜡石矿渣75～85％、Al<Sub>2</Sub>O<Sub>3</Sub>7～8％、Li<Sub>2</Sub>CO<Sub>3</Sub>3～4％、MgO 0～1％、ZnO 0～1％﹑Sb<Sub>2</Sub>O<Sub>3</Sub>0～1％,余量为晶核剂；通过高温熔融-急冷成型得到前驱玻璃,再通过热处理得到了析出β-石英固溶体和K-石英固溶体双晶相的低膨胀微晶玻璃。制得的微晶玻璃含β-石英固溶体和K-石英固溶体,在电子显微镜观测到的微晶玻璃中β-石英固溶体微晶粒径在0.1～2um；在20℃～300℃内,微晶玻璃的线性热膨胀系数介于±1.0×10<Sup>-6</Sup>/℃。(The invention discloses microcrystalline glass containing beta-quartz solid solution and K-quartz solid solution and having low expansion rate and prepared by pyrophyllite slag, and a preparation method thereof, wherein 75-85% of pyrophyllite slag and 75-85% of Al are respectively weighed according to parts by weight during preparation 2 O 3 7～8％、Li 2 CO 3 3～4％、MgO 0～1％、ZnO 0～1％﹑Sb 2 O 3 0-1% of nucleating agent, and the balance of nucleating agent; obtaining precursor glass through high-temperature melting-rapid cooling molding, and obtaining the low-expansion glass ceramics with separated beta-quartz solid solution and K-quartz solid solution dual-crystal phase through heat treatment. The prepared microcrystalline glass contains beta-quartz solid solution and K-quartz solid solutionThe grain size of the beta-quartz solid solution microcrystal in the microcrystalline glass observed by an electron microscope is 0.1-2 um; the linear thermal expansion coefficient of the microcrystalline glass is between plus or minus 1.0 multiplied by 10 within the temperature of 20-300 DEG C ‑6 /℃。)

1. A preparation method for developing low-expansion glass ceramics containing a beta-quartz solid solution and a K-quartz solid solution by using pyrophyllite slag is characterized by comprising the following steps of:

(1) 75-85% of pyrophyllite slag and 75-85% of Al are respectively weighed according to the parts by weight₂O₃7～8％、Li₂CO₃3～4％、MgO 0～1％、ZnO 0～1％﹑Sb₂O₃0-1% of nucleating agent, and the balance of nucleating agent.

(2) And uniformly mixing the powder raw materials, carrying out heat preservation melting at 1550-1600 ℃ for 1-6 hours, pouring into a mould, and carrying out ultra-cold forming to obtain the glass block.

(3) And (3) heating the glass prepared in the step (2) to 600-700 ℃ at the speed of 2-5 ℃/min, preserving the heat for 0.5-12 hours, continuously heating to 850-950 ℃ at the speed of 5-10 ℃/min, preserving the heat for 0.5-12 hours, and naturally cooling to room temperature to obtain the low-expansion glass ceramics containing the beta-quartz solid solution and the K-quartz solid solution.

2. The preparation method according to claim 1, wherein in the step 1, 83.59% of pyrophyllite slag and Al are weighed according to parts by mass₂O₃8.141％、Li₂O 3.926％、MgO 0.588％、ZnO 0.687％、Sb₂O₃0.981% of the balance being a nucleating agent.

3. The method according to claim 1, wherein the crystal nucleating agent is selected from ammonium metaphosphate, AlF₃，TiO₂One or more of basic zirconium carbonate is mixed according to any proportion.

4. The method according to claim 1, wherein the pyrophyllite slag, after calcination at 1600 ℃, has the following composition:

5. A low-expansion glass ceramics containing beta-quartz solid solution and K-quartz solid solution prepared by the preparation method of claims 1-4.

6. The low-expansion glass ceramics containing β -quartz solid solution and K-quartz solid solution according to claim 5, characterized by having the following composition in terms of mass fraction:

the balance being the nucleating agent reaction product.

7. The low-expansion glass ceramics comprising β -quartz solid solution and K-quartz solid solution according to claim 6, wherein the reaction product of the crystal nucleating agent is P₂O₅1 to 2% or AlF₃2 to 3%, or TiO₂3 to 4% or ZrO₂2～3％。

Technical Field

The invention relates to a method for developing a solid solution containing beta-quartz and K-stone by using pyrophyllite slagA low-expansion microcrystal glass of solid solution of quartz is prepared from pyrophyllite dregs as main raw material, pyrophyllite dregs as main component, microcrystalline glass with mass percentage up to 75% or more and linear thermal expansion coefficient at 20-300 deg.C (+/-1.0X 10) ^-6Within/° c.

Background

At low expansion of Li₂O-Al₂O₃-SiO₂In the system glass-ceramic, there are two important crystalline phases: beta-quartz and K-quartz, both derived from pure beta-quartz (silicon dioxide). Crystals of beta-quartz (hexagonal system) are composed of a large amount of [ SiO ]₄]The tetrahedron connected relatively open structure has relatively low heat expansion coefficient. When Si in beta-quartz⁴⁺Regularly coated with Li⁺And Al³⁺When substituted, a solid solution of beta-quartz of different nature, e.g. [ LiAl ], is formed]_xSi_2-xO₄The thermal expansion coefficient is negative, and the beta-quartz solid solution in the patent is the sillimanite [ LiAl ]]_xSi_3-xO₆. K-quartz is converted from beta-quartz at higher heat treatment temperatures and can be reacted with Li [ AlSiO ]₄]Form a wider solid solution K-quartz solid solution (also called beta-spodumene solid solution), and the heat treatment of the microcrystalline glass forms tetragonal Li_0.6Al_0.6Si_2.4O₆The crystal system is one of K-quartz solid solutions, two solid solution crystal phases and glass phases are simultaneously separated out from the lithium aluminum silicon microcrystalline glass by regulating and controlling the heat treatment time and temperature, the negative thermal expansion coefficient of the beta-quartz solid solution and the positive thermal expansion coefficients of the K-quartz solid solution and the glass phases are mutually offset, and the total thermal expansion coefficient of the microcrystalline glass is close to 0.

The low-expansion glass ceramics have wide application fields: the physical and chemical properties of the microcrystalline glass integrate the triple advantages of glass, ceramic and natural stone, such as high mechanical strength, corrosion resistance, heat resistance, wear resistance, good oxidation resistance, excellent electrical property, adjustable expansion coefficient, good thermal stability and the like, and the microcrystalline glass is superior to the natural stone and the ceramic, can be used for building curtain walls and indoor high-grade decoration, and also can be used as a mechanical structural material, an electronic and electrical insulating material, a bottom plate material of a large-scale integrated circuit, a microwave oven heat-resistant series utensil, a chemical and anticorrosive material, a mine wear-resistant material and the like, and is one of the new materials in the 21 st century which have the greatest development prospect at present.

At present, in the process of pyrophyllite mining, the resource waste is very serious, the mining is rich and the abandon of poverty, and the recovery rate is low, which is common in mines. For example, export pyrophyllite raw ore, eighties requiring high alumina ore (Al)₂O₃>25 percent of the available aluminum ore (Al) can be only required in the nineties₂O₃>21%) low grade pyrophyllite (Al)₂O₃Less than or equal to 18 percent or Fe₂O₃Not less than 0.7%) is only partially used in the ceramic industry, most pyrophyllite slag is abandoned on mines as waste materials in the mining process, so that the resource waste is huge, and the existing mines can be mined without ores in the near future. If the pyrophyllite slag is utilized to be used in the aspect of lithium-aluminum-silicon glass ceramics, the life requirements of people can be met, economic benefits can be brought, and the problem of pyrophyllite mining waste is relieved.

In the microcrystalline glass, pyrophyllite slag and the like are used as main production raw materials, no pollution is produced in the production process, the product has no radioactive pollution, and industrial waste can be recycled. The pyrophyllite slag mainly comprises alumina, silicon dioxide and the like, is used for producing microcrystalline glass, has the utilization rate of up to 100 percent, and has important meanings of solving the problem of environmental pollution of slag, increasing the economic value of the pyrophyllite slag, improving the scientific and technological level of enterprises and the like.

Disclosure of Invention

The invention aims to provide low-expansion glass ceramics containing a beta-quartz solid solution and a K-quartz solid solution and a preparation method thereof, which are developed by utilizing pyrophyllite slag.

The invention provides a preparation method for developing low-expansion glass ceramics containing a beta-quartz solid solution and a K-quartz solid solution by using pyrophyllite slag, which comprises the following steps:

(1) by mass75-85% of pyrophyllite slag and Al are respectively weighed in parts₂O₃7～8％、Li₂CO₃3～4％、MgO0～1％、ZnO 0～1％﹑Sb₂O₃0-1% of nucleating agent, and the balance of nucleating agent;

(2) uniformly mixing the powder raw materials, carrying out heat preservation melting at 1550-1600 ℃ for 1-6 hours, pouring the mixture into a mould, and carrying out ultra-cold forming to obtain a glass block;

(3) and (3) heating the glass prepared in the step (2) to 600-700 ℃ at the speed of 2-5 ℃/min, preserving the heat for 0.5-12 hours, continuously heating to 850-950 ℃ at the speed of 5-10 ℃/min, preserving the heat for 0.5-12 hours, and naturally cooling to room temperature to obtain the low-expansion glass ceramics containing the beta-quartz solid solution and the K-quartz solid solution.

Further, the pyrophyllite slag 83.59% and Al are respectively weighed according to the parts by weight₂O₃8.141％、Li₂O3.926％、MgO 0.588％、ZnO 0.687％、Sb₂O₃0.981% of the balance being a nucleating agent.

Further, the crystal nucleus agent is ammonium metaphosphate and AlF₃，TiO₂One or more of basic zirconium carbonate is mixed according to any proportion.

Further, pyrophyllite slag, after calcination at 1600 ℃, has the following composition:

the invention also provides the low-expansion microcrystalline glass containing the beta-quartz solid solution and the K-quartz solid solution, which is prepared by the preparation method. The microcrystalline glass contains a beta-quartz solid solution crystal phase and a K-quartz solid solution crystal phase, and the grain size of beta-quartz solid solution microcrystal in the microcrystalline glass observed by an electron microscope is 0.1-2 um; the linear thermal expansion coefficient of the microcrystalline glass is between plus or minus 1.0 multiplied by 10 within the temperature of 20-300 DEG C^-6/℃。

Further, the paint has the following composition in mass fraction:

the balance being the nucleating agent reaction product.

Further, the crystal nucleus agent reaction product is P₂O₅1 to 2% or AlF₃2 to 3%, or TiO₂3 to 4% or ZrO₂2～3％。

The invention has the beneficial effects that: pyrophyllite slag is used as the main component of the microcrystalline glass, and the mass fraction of the pyrophyllite slag in the microcrystalline glass formula reaches more than 75 percent. Glass ceramics contain two crystalline phases: namely beta-quartz solid solution and K-quartz solid solution, and the linear thermal expansion coefficient of the microcrystalline glass can be regulated to +/-1.0 multiplied by 10 by regulating the crystallization fractions of the crystal phase of the beta-quartz solid solution and the crystal phase of the K-quartz solid solution by controlling the treatment time and the treatment temperature ^-6The size of the precipitated crystal grains is within the range of 50nm to 2.0 mu m at a temperature of 20 ℃ to 300 ℃.

Drawings

FIG. 1 XRD spectrum of lithium-aluminum-silicon glass-ceramic

FIG. 2 TEM image of lithium aluminosilicate glass ceramics

Detailed Description