CN104761144A - Nontoxic glass clarifying agent and preparation method thereof - Google Patents

Abstract

The invention relates to a nontoxic glass clarifying agent and a preparation method thereof. The nontoxic glass clarifying agent 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, 0.2-0.4 part of lanthanum oxide, 8-9 parts of aluminum hydroxide, 4-5 parts of boehmite, 0.4-0.5 part of sodium bicarbonate, 3-5 parts of vapor-phase silicon dioxide and 5-7 parts of silica sol. The glass clarifying agent is free of arsenic, antimony and other high-toxicity substances, is friendly to the environment and harmless to the human body, and can not become black like arsenic-containing glass during processing. The sodium bicarbonate is granulated and calcined to form negative pressure inside the granules, thereby absorbing the small seeds and enhancing the effect of the clarifying agent. The vapor-phase silicon dioxide used by the production method can separate the effective components, enhances the high temperature resistance of the clarifying agent, can gradually release gases during processing, and can greatly reduce the seed concentration in the silicate glass. The seed concentration is approximately less than 1 seed/cm<3>.

Description

A kind of nontoxic glass fining agent and preparation method thereof

Technical field

The present invention relates to glass manufacturing area, particularly relate to a kind of nontoxic 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 nontoxic glass fining agent, this glass fining agent is environmentally friendly, harmless, add and can not turn black as containing arsenic glass man-hour, gas can be discharged step by step man-hour adding, greatly can reduce the seed concentration in silicate glass, seed concentration be about less than 1 seed/centimetre ³.

Technical scheme of the present invention is as follows:

A kind of nontoxic 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, lanthanum trioxide 0.2-0.4, aluminium hydroxide 8-9, boehmite 4-5, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 5-7.

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

(1) by saltcake, oxidation persimmon, stannic oxide, lanthanum trioxide, 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 of the present invention 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; 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, seed concentration be about less than 1 seed/centimetre ³.

Embodiment

A kind of nontoxic 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, lanthanum trioxide 0.3, aluminium hydroxide 8.5, boehmite 4.5, sodium bicarbonate 0.4, aerosil 4, silicon sol 6.

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

(1) by saltcake, oxidation persimmon, stannic oxide, lanthanum trioxide, 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 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 13, and bubble degree rank is a0.

Claims (2)

1. a nontoxic 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, lanthanum trioxide 0.2-0.4, aluminium hydroxide 8-9, boehmite 4-5, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 5-7.

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

(1) by saltcake, oxidation persimmon, stannic oxide, lanthanum trioxide, 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.