CN104843993A - Glass clarifying agent for float glass production and preparation method therefor - Google Patents

Abstract

The invention discloses a glass clarifying agent for float glass production and a preparation method therefor. The glass clarifying agent for float glass production is prepared from the following raw materials in parts by weight: 3-3.3 parts of mirabilite, 0.32-0.36 part of cerium oxide, 0.4-0.6 part of tin oxide, 2-3 parts of barium sulfate, 0.5-0.7 part of sodium fluosilicate, 1.1-1.4 parts of calcium sulfate, 2.5-2.8 parts of sodium chloride, 0.4-0.5 part of sodium hydrogen carbonate, 3-5 parts of fumed silica and 3-4 parts of silica sol. Compared with a single clarifying agent, the glass clarifying agent disclosed by the invention has better clarifying and discoloring effects, the problem that air bubbles in a float glass production process are difficult to move, especially the problems such as a high melting temperature, large viscosity, large surface tension and difficulty in clarifying of silicate glass are solved, the glass strength is greatly improved, and high-toxic substances containing arsenic, stibium and the like are avoided, so that the glass clarifying agent is environmentally-friendly and harmless to a human body, and does not get blackened like arsenic-containing glass in processing. The sodium bicarbonate is used for pelletizing and calcining, so that negative pressure is formed inside particles, small seeds can be absorbed, and the effect of the clarifying agent is improved.

Description

A kind of float glass glass fining agent and preparation method thereof

Technical field

The present invention relates to glass manufacturing area, particularly relate to a kind of float glass glass fining agent and preparation method thereof.

Background technology

Bubble in glass is one of major defect of glasswork, and the existence of a large amount of bubble has a strong impact on glass quality.For the visible bubble in bubble eliminated in glass must add a certain amount of finings in formula in the production process of glass.

At present, in glass production, white arsenic remains one of effective finings extensively adopted.But white arsenic has severe toxicity, 0.06 gram just can cause people desperately.On the other hand, when making finings with white arsenic, some enters in vitreum, with As ₂o ₃and As ₂o ₅form remainingly to get off, when lamp work heats, being easily reduced flame reduction becomes free arsenic, makes glass become black, has a strong impact on whiteness and the visual appearance of glass.Meanwhile, at high temperature about 1/3 volatile emission is in air for white arsenic, and contaminate environment, the white arsenic do not volatilized remains in glasswork, and when glass contain fluid medicine, drinks, beverage etc. can cause the stripping of arsenic, threaten to the physical safety of user.At present, some developed countries have limited containing arsenic glass product introduction domestic markets.In order to existence and the sound development of China's glass industry; from protection of the environment; ensure that the mankind are healthy and angle of exporting goods and earning foreign currency is set out; adopt nontoxic compound glass finings to replace white arsenic finings to produce glassy product, not only have larger economic benefit more to have great social benefit and environmental benefit.Therefore study nontoxic glass fining agent to have important practical significance.

Along with the improvement of glass kind and performance, make glass have damage resistant, withstand voltage, resistance toly to fall, shock resistance etc., the multiple excellence such as high transparency performance, but also there is more problem in production process, such as: the difficult problems such as temperature of fusion is high, surface tension is large, clarification difficulty is large, the high viscosity of these glass slow down the speed being removed bubble by stokes fining (Stokes fining); The fining effect by buoyancy of described stokes makes bubble rise to the surface of melt.Therefore, in order to improve the quality of glass further and reduce production cost, new finings be studied, improve the performance of glass, can also production cost be reduced, raise the efficiency.

Summary of the invention

The object of the present invention is to provide a kind of float glass glass fining agent, this glass fining agent clarify and decolorize effect, solve the problem that in float glass production process, bubble difficulty is removed, especially solve the problem that Melting Temperatures of Silicate Glasses is high, viscosity is large, surface tension is large, clarification is difficult, strength of glass improves greatly.

Technical scheme of the present invention is as follows:

A kind of float glass glass fining agent, is characterized in that being made up of the raw material of following weight part: saltcake 3-3.3, oxidation persimmon 0.32-0.36, stannic oxide 0.4-0.6, barium sulfate 2-3, Sodium Silicofluoride 0.5-0.7, calcium sulfate 1.1-1.4, sodium-chlor 2.5-2.8, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 3-4.

The production method of described float glass glass fining agent, is characterized in that:

(1) by saltcake, oxidation persimmon, stannic oxide, Sodium Silicofluoride, sodium bicarbonate mixing, pulverize, cross 500 mesh sieves, obtain powder;

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/3, evenly, dry, pulverize to particle diameter is at normal temperatures 1-100 micron, obtains particle in grinding;

(3) other remaining components mixed, grinding evenly, then adds the particle that (2) step obtains, and mix, granulation, particle diameter is 2-400 μm, sends into calcining furnace, at 340-350 DEG C, calcines 20-30 minute, takes out, to obtain final product.

Beneficial effect of the present invention

Glass fining agent of the present invention has better clarify and decolorize effect than single finings, solve the problem that in float glass production process, bubble difficulty is removed, especially the problem that Melting Temperatures of Silicate Glasses is high, viscosity is large, surface tension is large, clarification is difficult is solved, strength of glass improves greatly, not containing the highly toxic material such as arsenic, antimony, environmentally friendly, harmless, add and can not turn black as containing arsenic glass man-hour; By using sodium bicarbonate granulation calcining, forming negative pressure in granule interior, little seed can be absorbed, improve finings effect; Production method of the present invention uses aerosil, effective constituent is separated, improves the high thermal resistance of finings, can discharge gas step by step man-hour adding, greatly can reduce the seed concentration in silicate glass.

Embodiment

A kind of float glass glass fining agent, is made up of the raw material of following weight part (kilogram): saltcake 3.1, oxidation persimmon 0.34, stannic oxide 0.5, barium sulfate 2.5, Sodium Silicofluoride 0.6, calcium sulfate 1.2, sodium-chlor 2.6, sodium bicarbonate 0.5, aerosil 4, silicon sol 3.5.

The production method of described float glass glass fining agent, is characterized in that:

(1) by saltcake, oxidation persimmon, stannic oxide, Sodium Silicofluoride, sodium bicarbonate mixing, pulverize, cross 500 mesh sieves, obtain powder;

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/3, evenly, dry, pulverize to particle diameter is at normal temperatures 1-100 micron, obtains particle in grinding;

(3) other remaining components mixed, grinding evenly, then adds the particle that (2) step obtains, and mix, granulation, particle diameter is 2-400 μm, sends into calcining furnace, calcines 25 minutes at 345 DEG C, takes out, to obtain final product.

Experimental data: use the finings of this embodiment to make silicate glass, make the block sample of 5c m x 5c m x 0.5c m again. the community of 5 m m x 5 m m x 5 m m is divided into marking pen, by the bubble number in each community of observation by light microscope record, the bubble number in calculating every cubic centimetre after comprehensive.Finally obtaining bubble number is 16, and bubble degree rank is a0.

Claims (2)

1. a float glass glass fining agent, is characterized in that being made up of the raw material of following weight part: saltcake 3-3.3, oxidation persimmon 0.32-0.36, stannic oxide 0.4-0.6, barium sulfate 2-3, Sodium Silicofluoride 0.5-0.7, calcium sulfate 1.1-1.4, sodium-chlor 2.5-2.8, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 3-4.

2. the production method of float glass glass fining agent according to claim 1, is characterized in that:

(1) by saltcake, oxidation persimmon, stannic oxide, Sodium Silicofluoride, sodium bicarbonate mixing, pulverize, cross 500 mesh sieves, obtain powder;

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/3, evenly, dry, pulverize to particle diameter is at normal temperatures 1-100 micron, obtains particle in grinding;

(3) other remaining components mixed, grinding evenly, then adds the particle that (2) step obtains, and mix, granulation, particle diameter is 2-400 μm, sends into calcining furnace, at 340-350 DEG C, calcines 20-30 minute, takes out, to obtain final product.