CN114014529A - Isolating agent for fire polishing of borosilicate glass beads - Google Patents
Isolating agent for fire polishing of borosilicate glass beads Download PDFInfo
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- CN114014529A CN114014529A CN202111555091.1A CN202111555091A CN114014529A CN 114014529 A CN114014529 A CN 114014529A CN 202111555091 A CN202111555091 A CN 202111555091A CN 114014529 A CN114014529 A CN 114014529A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3229—Cerium oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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Abstract
Provides a release agent for fire polishing of borosilicate glass beads. The release agent consists of the following components in percentage by mass: 10-60% of alumina powder, 30-80% of quartz sand, 3-0.5% of salt, 1-3% of cerium oxide powder and 1-3% of magnesium oxide powder; wherein the grain diameter of the alumina powder is 140-200 meshes; the grain size of the quartz sand is 40-140 meshes; the salt is industrial grade, and the particle size is 100-120 meshes; the grain size of the cerium oxide powder is 180-220 meshes; the particle size of the magnesia powder is 180-220 meshes. The water content of the release agent is less than 1 mass%. The invention can meet the requirements of the production quality and the production efficiency of borosilicate glass beads by designing the chemical component content, the raw material granularity and the like of the separant.
Description
Technical Field
The invention belongs to the field of glass bead manufacturing, and particularly relates to a release agent for fire polishing of borosilicate glass beads.
Background
Glass beads are an important engineering material. In the prior art, methods for forming solid glass beads can be divided into the following two categories:
(1) dropping molten glass into fine beads method: directly and vertically contacting the side surface of the glass fine column by adopting high-temperature and high-speed flame, blowing the glass into small particles, enabling the small particles to fall in a sufficiently long liquid state time, and forming into intact or almost intact glass fine beads by virtue of surface tension;
(2) rolling soft glass into balls: firstly, cutting a glass strand into a section of ball blank at the speed of about 200 times per minute, then dropping the ball blank into a ball groove formed by three rollers with the same rotating direction through a ball divider, and gradually forming into smooth and round glass balls as a result of the complicated rotating rolling of the ball blank on the rollers and the surface tension action of the ball blank;
in addition, a fire-throwing beading method is also adopted in the actual production: performing fire polishing on the glass bead blank subjected to the press forming by using a fire polishing furnace to form a spherical shape, so as to obtain glass beads meeting the production requirements; the method specifically comprises the following steps: the glass bead blanks with poor roundness formed by pressing are added into the rotary pipe through a feeding bin of a fire throwing furnace, the temperature in the furnace is controlled to be 700-850 ℃, the bead blanks become soft at high temperature, are turned and displaced under the action of gravity, and finally are rounded by the surface tension of the bead blanks and flow out of the rotary pipe.
In the fire polishing bead forming method, bead blanks are easy to bond together after being softened at high temperature, so that the bead blanks and an isolating agent are mixed in a certain proportion at a feed inlet of a fire polishing furnace, a good isolating effect of the bead blanks at high temperature is ensured, and the bead blanks cannot be bonded together in a rotating pipe so as to reduce the production efficiency.
At present, graphite powder or carbon black is usually adopted as an isolating agent, and the isolating agent can achieve a certain isolating effect, but can be adhered to the surface of a glass bead to influence the original color and luster of the glass bead, so that the subsequent cleaning consumes time and labor, the production efficiency is influenced, and the relevant performance of the glass bead can be influenced to a certain extent.
In addition, in the operation process of the fire throwing furnace, the spiral conveyer is adopted to send the isolating agent and the glass beads into a fire throwing furnace roller, the isolating agent in the conveyer is easy to be stacked together under the vibration of a motor and does not fall down, at the moment, the isolating agent in the fire throwing furnace is less in distribution and is easy to cause the bonding of glass bead blanks, the working efficiency is reduced, and the production efficiency of a factory is influenced.
In addition, the existing technology for forming glass beads by fire polishing is mainly applied to the production of glass beads used as ornaments, and the technology mainly has high requirements on the glossiness and the like of the glass beads, but has no strict requirements on the chemical components of the glass beads. For borosilicate glass beads, the requirements of the application determine that the chemical composition requirements for the final borosilicate glass beads are strict, and the release agent for fire polishing process known in the prior art changes the chemical composition types and the oxide content of the borosilicate glass beads, and is not suitable for the fire polishing forming process of the borosilicate glass beads.
Thus, there is a need for a new release agent to solve the above technical problems to meet the quality and efficiency requirements of fire-polishing borosilicate glass beads.
Disclosure of Invention
Therefore, aiming at the defects of the prior art, the invention provides a release agent for fire polishing of borosilicate glass beads, which comprises the following components in percentage by mass: 10-60% of alumina powder, 30-80% of quartz sand, 3-0.5% of salt, 1-3% of cerium oxide powder and 1-3% of magnesium oxide powder;
wherein the grain diameter of the alumina powder is 140-200 meshes; the grain size of the quartz sand is 40-140 meshes; the salt is industrial grade, and the particle size is 100-120 meshes; the grain size of the cerium oxide powder is 180-220 meshes (preferably 200 meshes); the particle size of the magnesia powder is 180-220 meshes (preferably 200 meshes).
Wherein the water content of the release agent is less than 1 mass%; when the water content of the release agent is less than 1 mass%, it is sufficiently dried during the fire polishing, and deterioration in fluidity due to adsorption between raw materials in the silo can be avoided.
Wherein the powder repose angle of the release agent is 30-45 degrees; when the powder repose angle of the dusting agent is within this range, stable feeding can be continued in the conveyor.
The variation value of the conductivity is adopted to represent the fluctuation of the content of the water-soluble salt of the isolating agent powder, and the mixing uniformity of the isolating agent powder is represented by analyzing the conductivity difference of the randomly sampled powder; specifically, the conductivity of the prepared release agent powder in an aqueous solution is tested, and the uniformity of the prepared release agent powder is represented by calculating the change value of the conductivity of more than 3 random sampling times to reach more than 95%, so that the mixed release agent can be put into production for use.
The invention also provides a preparation method of the release agent for fire polishing of the borosilicate glass beads, which comprises the following steps:
(1) weighing alumina powder, quartz sand, salt, cerium oxide powder and magnesium oxide powder according to the formula of the separant to prepare a separant batch;
(2) mixing and stirring the separant batch, grinding and sieving by a 20-40 mesh (preferably 30 mesh) sieve;
(3) testing the water content of the release agent, and if the water content is less than 1 mass percent, meeting the water content requirement; if the water content is more than or equal to 1 mass percent, the separant needs to be dried to meet the requirement of the water content.
Wherein, in the step (2), the mixture is sieved for 2 to 5 times, and preferably 3 times.
Wherein, in the step (3), the drying time is 20-40min (preferably 30 min).
The invention also provides a method for fire polishing borosilicate glass beads, which comprises the following steps: and mixing the borosilicate glass bead blank with the separant, and feeding the mixture into a fire polishing furnace for fire polishing treatment to obtain the borosilicate glass beads.
Wherein, the obtained borosilicate glass beads are uniform spherical.
The invention has the following beneficial technical effects:
the invention designs the chemical component content and the raw material granularity of the separant, so that the separant can meet the requirements of the production quality and the production efficiency of borosilicate glass beads. Specifically, the method comprises the following steps:
(1) according to the invention, the isolating agent for the borosilicate glass is prepared according to the component requirement of the borosilicate glass beads, and the components of the isolating agent are designed, so that in the isolating agent, the raw materials for preparing the glass beads can be utilized according to the formula of the prepared borosilicate glass beads, the addition of phases can be reduced as much as possible, the borosilicate glass bead blank and the isolating agent can be prevented from introducing impurities into the glass beads when being contacted at high temperature in the actual fire polishing process, and the component of the borosilicate glass bead finished product can reach the required component index.
(2) According to the invention, the raw material granularity gradation of the separant is designed, and the separant powder repose angle is adjusted to be proper, so that the separant has good fluidity in the use process, the possibility of bonding glass beads of the fire polishing furnace roller together is reduced, and the fire polishing work efficiency is improved; and the feeding device ensures that the feeding device does not block the feed bin in the conveying process of the screw conveyor and can continuously and stably flow down.
(3) The separant has good thermal conductivity, can uniformly disperse heat inside the barrel body in the idle running process of the fire polishing furnace, can ensure that the bead blanks are uniformly heated after borosilicate glass bead blanks are added, and saves energy.
(4) In the preparation process of the separant, the raw materials are prepared according to the raw materials in the preparation process of the borosilicate glass, so that the introduction of impurities into the borosilicate glass beads in the fire polishing process is reduced, the preparation process is simple, the production cost is reduced, and the separant is suitable for popularization and use.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A release agent for fire polishing of borosilicate glass beads is prepared from the following components in percentage by mass: 40% of alumina powder, 55% of quartz sand, 3% of salt, 1% of cerium oxide powder and 1% of magnesium oxide powder;
wherein the particle size of the alumina powder is 140 meshes; the particle size of the quartz sand is 90 meshes; the salt is industrial grade, and the particle size of the salt is 100 meshes; the grain size of the cerium oxide powder is 200 meshes; the particle size of the magnesia powder is 200 meshes.
Wherein the water content of the release agent is less than 1 mass%, and the powder repose angle is 30-45 °.
The conductivity of the prepared separant powder in the aqueous solution is tested, and the change value of the conductivity of the prepared separant powder in the aqueous solution is calculated to be more than 95% by random sampling for more than 3 times.
The preparation method of the release agent for fire polishing of the borosilicate glass beads comprises the following steps:
(1) weighing alumina powder, quartz sand, salt, cerium oxide powder and magnesium oxide powder according to the formula of the separant to prepare a separant batch;
(2) mixing and stirring the separant batch, sieving with a 30-mesh sieve and screening
(3) The release agent is dried so that the water content thereof is less than 1 mass%.
And mixing the borosilicate glass bead blank with the separant, and feeding the mixture into a fire polishing furnace for fire polishing treatment to obtain the borosilicate glass beads.
Table 1 lists the compositions of the two formulations of borosilicate glass beads before and after forming the beads by fire polishing using the release agent of example 1.
TABLE 1 comparison of the compositions of borosilicate glass beads before and after fire polishing
As shown in table 1, comparing the composition changes of the two borosilicate glass beads before and after fire polishing, it can be seen that the composition difference between the prepared bead blank and the bead after fire polishing is small by using the release agent of the present invention, and the release agent meets the requirement of borosilicate glass bead preparation, i.e. the release agent of the present invention is suitable for the production of borosilicate glass beads with high requirements on chemical compositions.
Comparative example 1-Release agent containing neither silica sand nor cerium oxide powder
A release agent for fire polishing of borosilicate glass beads is prepared from the following components in percentage by mass: 95% of alumina powder, 3% of salt and 2% of magnesia powder;
wherein the particle size of the alumina powder is 140 meshes; the particle size of the quartz sand is 90 meshes; the salt is industrial grade, and the particle size of the salt is 100 meshes; the grain size of the cerium oxide powder is 200 meshes; the particle size of the magnesia powder is 200 meshes.
Wherein the water content of the release agent is less than 1 mass%, and the powder repose angle is 30-45 °.
The conductivity of the prepared separant powder in the aqueous solution is tested, and the change value of the conductivity of the prepared separant powder in the aqueous solution is calculated to be more than 95% by random sampling for more than 3 times.
The preparation method of the release agent for fire polishing of the borosilicate glass beads comprises the following steps:
(1) weighing alumina powder, quartz sand, salt, cerium oxide powder and magnesium oxide powder according to the formula of the separant to prepare a separant batch;
(2) mixing and stirring the separant batch, sieving with a 30-mesh sieve and screening
(3) The release agent is dried so that the water content thereof is less than 1 mass%.
And mixing the borosilicate glass bead blank with the separant, and feeding the mixture into a fire polishing furnace for fire polishing treatment to obtain the borosilicate glass beads.
Table 2 lists the compositions of the bead blank and finished bead before and after fire polishing molding of two formulations of borosilicate glass beads using the release agent of comparative example 1.
TABLE 2 comparison of compositions before and after fire polishing of borosilicate glass beads
Comparing the bead blanks with the two formulas and fire-polished finished beads, and using the separant of comparative example 1, the mass percentage content of partial oxides in the components of the borosilicate glass beads does not meet the component requirement range after the fire polishing of the glass beads; the fluctuation range of chemical components which cannot meet the requirements of borosilicate glass bead production, for example, the content of boron oxide in the fire-polished finished bead of formula 1 does not meet the requirements; the content of alumina in the fire-polished finished bead of the formula 2 does not meet the requirement. Compared with the fire polished finished product bead obtained by using the release agent in example 1, the glass bead produced by using the release agent in comparative example 1 has lower roundness and darker luster.
Comparative example 2-release agent composition the same as in example 1, but the release agent powder particle size is not in accordance with the requirements of the invention
A release agent for fire polishing of borosilicate glass beads is prepared from the following components in percentage by mass: 40% of alumina powder, 55% of quartz sand, 3% of salt, 1% of cerium oxide powder and 1% of magnesium oxide powder;
wherein the particle size of the alumina powder is 250 meshes; the particle size of the quartz sand is 90 meshes; the salt is industrial grade and has a particle size of 120 meshes; the grain size of the cerium oxide powder is 200 meshes; the particle size of the magnesia powder is 200 meshes.
Wherein the moisture content of the release agent is less than 1 mass%, and the powder repose angle is less than 30 °.
The conductivity of the prepared separant powder in the aqueous solution is tested, and the change value of the conductivity of the prepared separant powder in the aqueous solution is calculated to be more than 95% by random sampling for more than 3 times.
The preparation method of the release agent for fire polishing of the borosilicate glass beads comprises the following steps:
(1) weighing alumina powder, quartz sand, salt, cerium oxide powder and magnesium oxide powder according to the formula of the separant to prepare a separant batch;
(2) mixing and stirring the separant batch, sieving with a 30-mesh sieve and screening
(3) The release agent is dried so that the water content thereof is less than 1 mass%.
And mixing the borosilicate glass bead blank with the separant, and feeding the mixture into a fire polishing furnace for fire polishing treatment to obtain the borosilicate glass beads.
Table 3 lists the compositions of the bead blank and finished bead before and after fire polishing molding using the release agent of comparative example 2 for two formulations of borosilicate glass beads.
TABLE 3 comparison of compositions before and after fire polishing of borosilicate glass beads
As shown in Table 3, comparing the composition changes before and after fire polishing of the two borosilicate glass beads, it can be seen that the composition difference between the prepared bead blank and the bead after fire polishing is smaller by using the release agent of comparative example 2, and the composition requirements for preparing the borosilicate glass beads are satisfied.
However, since the particle size of the isolating agent powder does not meet the requirement of the present invention, specifically, the particle size of the alumina powder in the isolating agent powder of the comparative example 2 exceeds the upper limit value of 200 meshes required by the present invention, which causes the flowability of the isolating agent powder to change, and further causes the isolating agent in the fire polishing furnace to decrease, thereby affecting the fire polishing efficiency of beads, and a large amount of semi-finished beads appear. Specifically, in comparative example 2, the actual glass bead polishing yield per hour was only 40kg (whereas in example 1, the yield was 80kg per hour), and the inner glass beads were bonded in the fire polishing furnace due to the less amount of the release agent, which decreased the working efficiency. In addition, the roundness of the produced glass beads cannot meet the requirement, and fire polishing needs to be carried out again.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A release agent for fire polishing of borosilicate glass beads comprises the following components in percentage by mass: 10-60% of alumina powder, 30-80% of quartz sand, 3-0.5% of salt, 1-3% of cerium oxide powder and 1-3% of magnesium oxide powder;
wherein the grain diameter of the alumina powder is 140-200 meshes; the grain size of the quartz sand is 40-140 meshes; the salt is industrial grade, and the particle size is 100-120 meshes; the grain size of the cerium oxide powder is 180-220 meshes; the particle size of the magnesia powder is 180-220 meshes.
2. A release agent as defined in claim 1, wherein the moisture content of the release agent is less than 1 mass%.
3. The release agent according to claim 1, wherein the powder repose angle of the release agent is 30 to 45 °.
4. A method of preparing the release agent for fire polishing borosilicate glass beads according to any one of claims 1 to 3, comprising:
(1) weighing alumina powder, quartz sand, salt, cerium oxide powder and magnesium oxide powder according to the formula of the separant to prepare a separant batch;
(2) mixing and stirring the separant batch, grinding, and sieving by a 20-40 mesh sieve;
(3) testing the water content of the release agent, and if the water content is less than 1 mass percent, meeting the water content requirement; if the water content is not less than 1 mass%, the release agent needs to be dried so that the water content of the release agent is less than 1 mass%.
5. The process for producing a release agent according to claim 4, wherein in the step (2), the screen is passed 2 to 5 times.
6. The method for preparing release agent according to claim 4, wherein in the step (3), the drying time is 20-40 min.
7. A method of fire polishing borosilicate glass beads comprising: mixing borosilicate glass bead blanks with the release agent as defined in any one of claims 1 to 3, and feeding the mixture into a fire polishing furnace for fire polishing forming treatment to obtain borosilicate glass beads.
8. The method of fire polishing borosilicate glass beads according to claim 7, wherein the resulting borosilicate glass beads are of a uniform spherical shape.
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| CN112592050A (en) * | 2020-12-06 | 2021-04-02 | 河北驰野玻璃珠有限责任公司 | Isolating agent for glass bead production and recycling method thereof |
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