阅读说明：本技术 浮法玻璃澄清剂 (Clarifying agent for float glass ) 是由 代丽萍 白一波 吴宾 蔡邦辉 陈�峰 刘涛 于 2019-07-12 设计创作，主要内容包括：本发明公开了一种浮法玻璃澄清剂,其特征在于包括组份按以下重量百分比氟化钙占5％～15％；硝酸钠占10％～45％；氯化钠占10％～45％；氯化铵占3％～10％；氧化锡占10％～30％；氧化钆占0.5％～2.0％；氧化钇占0.2％～1.1％。本发明的配方合理,加入氧化钆和氧化钇,不仅完全解决了气泡问题,而且玻璃的品质有较大的提高,同时也可以大大降低玻璃液高温黏度,同时也可以提高玻璃热的稳定性。(The invention discloses a float glass clarifying agent, which is characterized by comprising the following components by weight percent, calcium fluoride accounts for 5% -15%; sodium nitrate accounts for 10 to 45 percent; sodium chloride accounts for 10 to 45 percent; 3% -10% of ammonium chloride; tin oxide accounts for 10 to 30 percent; gadolinium oxide accounts for 0.5% -2.0%; 0.2 to 1.1 percent of yttrium oxide. The invention has reasonable formula, and the gadolinium oxide and the yttrium oxide are added, thereby not only completely solving the problem of bubbles, but also greatly improving the quality of glass, greatly reducing the high-temperature viscosity of glass liquid and simultaneously improving the thermal stability of the glass.)

1. A float glass clarifying agent is characterized by comprising the following components by weight percent, calcium fluoride accounts for 5% -15%; sodium nitrate accounts for 10 to 45 percent; sodium chloride accounts for 10 to 45 percent; 3% -10% of ammonium chloride; tin oxide accounts for 10 to 30 percent; gadolinium oxide accounts for 0.5% -2.0%; 0.2 to 1.1 percent of yttrium oxide.

2. The float glass fining agent according to claim 1, wherein: the calcium fluoride is introduced from fluorite, the purity of the calcium fluoride is more than or equal to 85 percent, the purity of the sodium nitrate is more than 99.50 percent, the purity of the sodium chloride is more than 99.10 percent, the tin oxide comprises tin oxide and ferric oxide, wherein the content of the tin oxide is more than or equal to 98 percent, the content of the ferric oxide is less than or equal to 0.04 percent, the purity of the gadolinium oxide is more than or equal to 99.95 percent, and the content of the yttrium oxide is more than or equal to 99 percent.

Technical Field

The invention belongs to the technical field of glass clarification, and particularly relates to a float glass clarifying agent.

Background

In the production of float glass, a clarifier is of great importance, and high-quality glass can be produced by using anhydrous sodium sulphate (the main component is Na ₂ SO ₄) As a clarifier for general Na ₂ O-CaO-SiO ₂ series glass, but for high-alumina glass containing high aluminum, bubbles in the glass cannot be discharged by using the anhydrous sodium sulphate, and even qualified glass cannot be produced.

Disclosure of Invention

The invention aims to provide a float glass clarifying agent which is reasonable in structure and arrangement and strong in applicability.

The technical scheme for realizing the aim of the invention is that the float glass clarifying agent comprises the following components by weight percent, calcium fluoride accounts for 5% -15%; sodium nitrate accounts for 10 to 45 percent; sodium chloride accounts for 10 to 45 percent; 3% -10% of ammonium chloride; tin oxide accounts for 10 to 30 percent; gadolinium oxide accounts for 0.5% -2.0%; 0.2 to 1.1 percent of yttrium oxide.

The calcium fluoride is introduced from fluorite, the purity of the calcium fluoride is more than or equal to 85 percent, the purity of the sodium nitrate is more than 99.50 percent, the purity of the sodium chloride is more than 99.10 percent, the tin oxide comprises tin oxide and ferric oxide, wherein the content of the tin oxide is more than or equal to 98 percent, the content of the ferric oxide is less than or equal to 0.04 percent, the purity of the gadolinium oxide is more than or equal to 99.95 percent, and the content of the yttrium oxide is more than or equal to 99 percent.

The invention has the positive effects that: the invention has reasonable formula, and the gadolinium oxide and the yttrium oxide are added, thereby not only completely solving the problem of bubbles, but also greatly improving the quality of glass, greatly reducing the high-temperature viscosity of glass liquid and simultaneously improving the thermal stability of the glass.

Detailed Description

A float glass clarifying agent comprises the following components by weight percent, calcium fluoride accounts for 5% -15%; sodium nitrate accounts for 10 to 45 percent; sodium chloride accounts for 10 to 45 percent; 3% -10% of ammonium chloride; tin oxide accounts for 10 to 30 percent; gadolinium oxide accounts for 0.5% -2.0%; 0.2 to 1.1 percent of yttrium oxide.

The calcium fluoride is introduced from fluorite, the purity of the calcium fluoride is more than or equal to 85 percent, the purity of the sodium nitrate is more than 99.50 percent, the purity of the sodium chloride is more than 99.10 percent, the tin oxide comprises tin oxide and ferric oxide, wherein the content of the tin oxide is more than or equal to 98 percent, the content of the ferric oxide is less than or equal to 0.04 percent, the purity of the gadolinium oxide is more than or equal to 99.95 percent, and the content of the yttrium oxide is more than or equal to 99 percent.

Application method of clarifying agent

The silica sand and the clarifying agent are mixed in advance, and then the glass batch is prepared from the mixed silica sand and the clarifying agent. The clarifying agent and the silica sand are mixed in advance according to the proportion of 1: 15. And mixing, and weighing with an electronic scale.

My plant has done many experiments before the fining agent is used. Sodium sulfate and sodium chloride (each accounting for 50%) are used as clarifying agents at the beginning, sodium nitrate and sodium chloride (each accounting for 50%) are used as clarifying agents, numerous experiments are carried out, calcium fluoride, sodium nitrate, sodium chloride, ammonium chloride and tin oxide are used as clarifying agents, high-alumina glass is melted, and finally calcium fluoride, sodium nitrate, sodium chloride, ammonium chloride, tin oxide, gadolinium oxide and yttrium oxide are used for melting qualified high-alumina glass.

Sodium sulfate and sodium chloride (50% of each) are used as fining agents at first, the amounts of fining agents and silica sand are 1: 20, the amount of the fining agents is gradually increased because too many bubbles exist, and finally, the amounts of the fining agents and the silica sand are 1: 15, so that the melted glass still fills the dense and hemp bubbles, and the amount of the bubbles is 1 ^#, 2 ^# and 3 ^# in the following table 1, corresponding data are shown in the following table 1, the amount of the bubbles is increased because the bubbles generated after the sodium sulfate is used as the fining agents contains more sulfur dioxide, so that the lower surface of the glass plate has too many tin-staining defects, the sodium sulfate in the fining agents is removed, sodium nitrate is added, the above search is still carried out, the defects of tin-staining are obviously improved from the view of the amount of the bubbles and the defects of tin-staining in the following table 1, although the amount of the bubbles is reduced, but still not ideal, and the results are shown in the following table 4 ^# and 5, ^#, 2 months of experiments, the period of which result is unsatisfactory fining effect, the fining agents are improved again, calcium fluoride, ammonium chloride and tin oxide are added, and the amount of each substance is accurately adjusted, but the best results are not shown in the table 7, corresponding data of gadolinium oxide, and the problems of the table 3, corresponding to the table 3, not only improved from the problems of gadolinium oxide, corresponding.

TABLE 1 glass Defect statistics

Effect of clarifying agent

The bubbles in the finished glass are greatly reduced

A pair of clarifiers is prepared by calcium fluoride (accounting for 12 percent), sodium nitrate (accounting for 25 percent), sodium chloride (accounting for 29.5 percent), ammonium chloride (accounting for 8 percent), tin oxide (accounting for 24.2 percent), gadolinium oxide (accounting for 0.8 percent) and yttrium oxide (accounting for 0.5 percent), then the clarifiers and silica sand are mixed according to the ratio of 1: 15 to prepare a melting sample, and the result is determined as 9 ^# in Table 1. compared with glass samples melted by 3 ^#, 5 ^#, 7 ^# and 9 ^# clarifiers in Table 1, it can be clearly seen that the quantity of bubbles in the formed glass is only 1 by using the clarifiers disclosed by the invention, and the glass is completely qualified glass.

② the high-temperature viscosity of the glass liquid is greatly reduced

The glass produced by the factory is high-alumina glass, the viscosity is high in the clarification stage (for example, 1450 ℃ -1550 ℃, the viscosity is between 10 ^1.1 -10 ^1.3 Pa.S), gas in the glass melt cannot escape in time, bubble defects are formed in the glass plate after forming, and various performances of the glass are reduced, so that in the high-temperature melting stage, the gas staying in the melt is managed to be discharged, for general soda-lime-silica series glass, because the gas is slightly low in high temperature (also in the 1450 ℃ -1550 ℃, the corresponding viscosity is between 10 ^0.7 -10 ¹ Pa.S), a common clarifying agent such as mirabilite can help to discharge all bubbles, but for high-alumina glass, because the bubbles in the melt are still high in the same high temperature, the bubbles are extremely difficult to discharge, on one hand, the melting temperature needs to be increased, on the other hand, a better clarifying agent needs to be developed to help to discharge the bubbles, and the clarifying agent is prepared by mixing several substances, so that the high-alumina glass manufacturer at the same temperature, the corresponding viscosity is between 1450 ℃ -10 Pa.10 Pa.82, the clarifying effect is greatly reduced, such as the quality of the high-alumina glass is greatly reduced.

Thirdly, the glass clarifying agent improves the refractive index of the glass

The refractive index of the glass was measured for samples No. 2 ^#, 5 ^#, 7 ^# and 9 ^#, and the results are shown in Table 2 below, from which it can be seen that the refractive index of the glass melted with the fining agent was significantly increased due to the incorporation of tin (Sn ⁴⁺) into the glass composition.

TABLE 2 refractive index of glass

Specimen serial number	2#	5#	7#	9#
					Refractive index	1.55	1.58	1.68	1.74

The glass clarifying agent improves the thermal stability of the glass

The results of the measurement of the thermal stability of the glass according to the powder method for samples No. 2 ^#, 5 ^#, 7 ^# and 9 ^# are shown in the following table 3. the measurement results show that the introduction of rare earth ions (Gd ³⁺ and Y ³⁺) obviously inhibits the precipitation of Li ⁺ ions in the glass structure and avoids the integrity of the glass structure from being damaged.

TABLE 3 determination of the thermal stability of the glasses

Specimen serial number	2#	5#	7#	9#
					Li+Ion elution amount (mg/g)	0.031	0.036	0.028	0.008

The invention has reasonable formula, and the gadolinium oxide and the yttrium oxide are added, thereby not only completely solving the problem of bubbles, but also greatly improving the quality of glass, greatly reducing the high-temperature viscosity of glass liquid and simultaneously improving the thermal stability of the glass.

The standard parts used in the present embodiment can be purchased directly from the market, and the non-standard structural parts described in the specification can also be obtained by processing without any doubt according to the common general knowledge in the prior art, and the connection mode of the parts adopts the conventional means matured in the prior art, and the machines, parts and equipment adopt the conventional models in the prior art, so that the detailed description is not given here.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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 such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the present invention.