CN110642500A

CN110642500A - Glass batch melting method

Info

Publication number: CN110642500A
Application number: CN201810667266.XA
Authority: CN
Inventors: 张小苏
Original assignee: JIANGSU YUEFENG TECHNOLOGY Co Ltd
Current assignee: JIANGSU YUEFENG TECHNOLOGY Co Ltd
Priority date: 2018-06-26
Filing date: 2018-06-26
Publication date: 2020-01-03

Abstract

The invention discloses a glass batch melting method which comprises the following steps of (1) adding 0.5wt% ~ wt% of a binder and 6wt% ~ wt% of water into a glass batch, uniformly mixing, pressing into spherical granules of 3 ~ mm and pressing into spherical granules of 3 ~ mm, (2) adding the spherical granules into a rotary heating furnace, preheating at 1020 ~ ℃ for 0.5 ~ h, and adding the sintered and densified spherical granules into a glass melting furnace from an outlet of the rotary heating furnace.

Description

Glass batch melting method

Technical Field

The invention belongs to the technical field of glass manufacturing, and particularly relates to a glass batch melting method.

Background

The plate glass is made up of powdered raw materials through crushing, sieving, weighing and mixing. The loose materials are easy to generate layering and powder flying in the processes of conveying, storing and the like, and the batch materials which are just fed into the melting furnace are easy to be blown by flame and taken out of the melting furnace, so that the composition of glass is changed, the crown and the regenerator of the melting furnace are corroded, and the environment is polluted;

the loose form of the batch is fed into the melting furnace, and the bulk density is low, so the efficiency of heating the batch by the flame is low. In addition, the batch is put into the melting furnace with a certain thickness, and the heat conduction performance of the loose batch is particularly poor, so the process of forming silicate by heating is long, the heat exchange efficiency is low, and the melting quality is influenced. Although the scale of the glass melting furnace is continuously enlarged at present, the problem is not solved all the time;

the structure and the melting method of the current glass melting furnace determine that the silicate formation, the glass clarification and the glass homogenization in the five processes of glass melting are completed in the same structure. The more gaseous components are entrained in the batch, the longer the fining, homogenization time required for the glass melt. The continuous expansion of the glass melting furnace is limited from another aspect;

along with the continuous expansion of the glass melting furnace, the span of the cross-sectional area of the glass melting furnace is also larger and larger, the self weight of the melting furnace is continuously increased, and higher requirements are provided for a steel structure and refractory materials of the glass melting furnace, so that the yield and quality of glass are improved, and the energy consumption and the exhaust emission are reduced more and more difficult from the perspective of expanding the single line scale on the premise of not changing the glass melting mode.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a glass batch melting method, which is characterized in that decomposition of carbonate and formation of silicate in a glass batch are completed by transferring the raw materials in a traditional melting furnace to a rotary heater outside the melting furnace, the melting amount can be increased by 20% ~ 30% under the condition that the scale of the melting furnace is not enlarged at present, the melting quality of glass is improved, and the effects of energy conservation and emission reduction are achieved.

In order to solve the technical problems, the invention adopts the technical scheme that:

a pre-sintering treatment process of glass batch comprises the following steps:

(1) 0.5wt% of ~ 3wt% of binder and 6wt% of ~ 8wt% of water are added into the glass batch, mixed evenly and pressed into spherical granules of 3 ~ 25 mm;

(2) the spherical granules are added into a rotary heating furnace and pre-sintered for 0.5 ~ 2h at 1020 ~ 1250 ℃, and the sintered and densified spherical granules are added into a glass melting furnace from the outlet of the rotary heating furnace.

The method has the advantages that (1) carbonate in the glass batch is decomposed and transferred outside the glass melting furnace, so that the gas content in the glass batch is greatly reduced, the heat transfer is effectively improved, the time for clarifying and homogenizing the glass is shortened, the single-line yield is improved and the energy consumption is reduced on the premise of not enlarging the area of the glass melting furnace, the melting amount can be increased by 20% ~ 30% under the condition of not enlarging the scale of the glass melting furnace at present, and (2) the heat source of the rotary heating furnace is part of smoke generated by fuel combustion in the glass melting furnace, the insufficient heat is supplied by a burner, and a large amount of energy is saved.

Detailed Description

The invention will be further illustrated by the following examples

Example 1

(1) Dissolving water glass accounting for 1.5wt% of the glass batch in water accounting for 8wt% of the glass batch, then adding the water glass solution into the glass batch, uniformly mixing, and pressing the mixture into spherical granules of 5 ~ 18mm by using a pair roller with a semicircular concave surface on the surface;

(2) adding the spherical granules into a rotary heating furnace, pre-burning at 1180 ~ 1250 ℃ and adding the sintered and densified spherical granules into a glass melting furnace from an outlet of the rotary heating furnace;

since the pellet pressed into a spherical shape was 5 ~ 18mm, the time for pre-firing decomposition in the rotary heating cylinder was about 1 hour.

Example 2

(1) Dissolving water glass accounting for 3wt% of the glass batch into hot water (80-100 ℃) accounting for 7 wt% of the glass batch, then doping the water glass solution into the glass batch, uniformly mixing, and pressing the mixture into spherical granules of 8 ~ 25mm by using a pair roller with a semicircular concave surface on the surface;

(2) adding the spherical granules into a rotary heating furnace, pre-burning at 1020 ~ 1150 ℃ to 1150 ℃, and adding the sintered and densified spherical granules into a glass melting furnace from an outlet of the rotary heating furnace;

the time of pre-burning decomposition of the pellets pressed into balls is about 1.5 hours because the pellets are 8 ~ 25mm, the glass batch is subjected to pre-burning treatment simultaneously by adopting 3 groups of devices described in example 1, and the carbonate in the batch is completely decomposed in a rotary heater, so that the gas quantity brought by the carbonate is greatly reduced, the melting time, the clarifying time and the homogenizing time of the glass are greatly shortened, and the melting quantity of the glass is greatly improved in a certain time.

Claims

1. A glass batch melting method is characterized by comprising the following steps:

(1) 0.5wt% ~ 3wt% of a binder and was added to the glass batch and pressed into 3 ~ 25mm spherical pellets;

2. A glass batch melting method according to claim 1, wherein in step (1), the glass batch is pressed into spherical pellets by using a pair of rollers having a semicircular concave surface on the surface.

3. A glass batch melting process according to claim 1, characterised in that the binder is water glass or methyl cellulose.