CN104761143A - Clarifying agent for aluminum silicate glass and preparation method of clarifying agent - Google Patents

Abstract

The invention provides a clarifying agent for aluminum silicate glass and a preparation method of the clarifying agent. The clarifying agent for the aluminum silicate glass 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 potassium chloride, 2-3 parts of borax, 2-3 parts of fluorite, 1-1.5 parts of barium carbonate, 0.4-0.5 part of sodium hydrogen carbonate, 3-5 parts of aerosil and 3-4 parts of silica sol. The glass clarifying agent provided by the invention is high in clarifying efficiency and thorough in bubble removal effect, and cannot generate secondary bubbles easily; by using sodium hydrogen carbonate for granulation calcination to form a negative pressure in particles, the clarifying agent can absorb small seeds, the effect of the clarifying effect is improved, and the clarifying agent is of important significance for improving the quality of float glass; and the clarifying agent does not contain high-toxicity substances such as arsenic and antimony, is environment-friendly and harmless to human bodies, and cannot turn black like arsenic-containing glass during processing.

Description

A kind of alumina silicate glass finings and preparation method thereof

Technical field

The present invention relates to glass manufacturing area, particularly relate to a kind of alumina silicate glass finings 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 alumina silicate glass finings, this glass fining agent bubble is removed thoroughly, and not easily occurs reboil bubble, improves float glass quality significant, is applicable to alumina silicate glass.

Technical scheme of the present invention is as follows:

A kind of alumina silicate glass finings, 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, Repone K 2-3, borax 2-3, fluorite 2-3, barium carbonate 1-1.5, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 3-4.

The production method of described alumina silicate glass finings, is characterized in that:

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

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/2, 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 clarifying efficiency of the present invention is high, and bubble is removed thoroughly, and not easily occurs reboil bubble, by using sodium bicarbonate granulation calcining, forming negative pressure in granule interior, little seed can be absorbed, improve finings effect, significant for raising float glass quality; This finings is not containing the highly toxic material such as arsenic, antimony, environmentally friendly, harmless, adds and can not turn black as containing arsenic glass man-hour; 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; Finings of the present invention is applicable to alumina silicate glass.

Embodiment

A kind of alumina silicate glass finings, is made up of the raw material of following weight part (kilogram): saltcake 3.1, oxidation persimmon 0.34, stannic oxide 0.5, Repone K 2.5, borax 2.5, fluorite 2.5, barium carbonate 1.3, sodium bicarbonate 0.4, aerosil 4, silicon sol 3.5.

The production method of described alumina silicate glass finings, is characterized in that:

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

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/2, 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 aluminate 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 15, and bubble degree rank is a0.

Claims (2)

1. an alumina silicate glass finings, 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, Repone K 2-3, borax 2-3, fluorite 2-3, barium carbonate 1-1.5, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 3-4.

2. the production method of alumina silicate glass finings according to claim 1, is characterized in that:

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

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/2, 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.