JPS59121133A - Reactor for preparing raw material for producing glass - Google Patents

Abstract

PURPOSE:In the titled reactor by feeding an alkali solution to a fluidized layer of silica sand to carry out a reaction, to form a raw material for producing glass having uniform distribution of sulfate (sulfite), by providing a feeder of sulfur oxide for the fluidized layer. CONSTITUTION:A production device for raw material for producing glass is constructed by arranging the preheater 1, the reactor 2, and the granulator 3 in series. In the reactor 2, silica sand introduced from the preheater 1 is fluidized by air sent from the pipe 2B, and the blade 2C rotated through the motor M and the revolving shaft 2D, it is fed through the path 9b, and the jetting hole 9a to a solution of caustic soda, and reacted. The silica sand is converted into sodium metasilicate at the surface, the feed opening 10b for feeding sulfur dioxide gas sent through the pipe 10a is connected to the feed path 2B for fluidizing air, and the sulfur dioxide gas together with the fluidizing air is fed to the fluidized layer to form a sulfate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention supplies an alkaline raw material such as caustic soda to a fluidized bed of silica sand formed by supplying a fluidizing gas and causes the two to react, thereby improving part or all of the surface of silica sand. This invention relates to a reactor for producing a raw material for producing gafnu which is converted into an alkali silicate such as sodium metasilicate and has excellent solubility.

Silica sand whose surface has been partially or completely converted into an alkali silicate such as sodium metasilicate has better solubility than silica sand which does not have an alkali silicate, but when dissolved, the alkali silicate It is thought that the salt plays a role in inhibiting the contact reaction between the unreacted portion of the silica sand core and the molten glass, and the progress of dissolution of the unreacted portion is slow. Therefore, with the aim of increasing the solubility of the unreacted portion of the silica sand core and making the solubility of silica sand even better, the present applicant has published Japanese Patent Application Laid-Open No. 55-100H5. The method disclosed in the publication, that is, by supplying Asahi salt, gypsum, barium sulfate, sodium sulfite, etc. to silica sand together with alkaline raw materials and causing a reaction, the dissolution of the silica sand surface improves the wettability to the lath. A method has previously been provided in which sulfate or sulfite is included in silica sand to promote dissolution of the unreacted portion of the silica sand core.

The purpose is to provide a reactor that can produce homogeneous raw materials for the production of gas by making the distribution of sulfates and sulfites uniform by effectively utilizing the flow effect. It is in the point of doing.

In order to achieve the above object, the reactor for producing raw materials for lath production according to the present invention is characterized in that the fluidized bed is provided with a device for supplying sulfur dioxide, sulfur trioxide, or both. It is in the point where it is.

The effects of the present invention with the above characteristic configuration are as follows.

Since sulfur dioxide, which is formed by the reaction of CD sulfate and sulfite with an alkaline raw material such as caustic soda, is supplied in gaseous form, (() the supply of gas containing sulfur dioxide can be easily, accurately, and stably controlled. (b) Corrosion of the supply piping, etc., of the supply equipment is unlikely to occur.

[■] Since the alkaline material and the gas are supplied to the fluidized bed and reacted, (a) the fluidity of the fluidized bed is used to uniformly distribute both in the fluidized bed, and the reaction of both is carried out throughout the fluidized bed. (b) Sulfate or sulfite is attached only to silica sand particles or silica sand particles whose surfaces have been partially or entirely converted to alkali silicate, for example. Compared to the conventional method of mixing sulfate into the entire glass raw material, the dissolution rate can be increased, and the sulfate can be used more efficiently and the amount used can be reduced.

The effects of the above action are as follows.

(1) By the effect of (1-a) above, the amount M of sulfate and sulfite relative to the amount of silica sand can be easily and accurately controlled.

(2) Due to the effect of [1] above, the distribution of sulfate and sulfite can be made uniform.

As a result, it is possible to produce a quantitative quality raw material for glass lath production that has excellent solubility and stable solubility as a whole.

(3) Due to the effect of (I'-b) above, the durability of the supply device can be improved.

(4) Due to the effect of (!I-b), the amount of sulfur dioxide and sulfur trioxide generated during lath melting can be reduced.

In particular, when the gas supply device supplies the gas to the fluidizing gas supply path, supplying the gas together with the fluidizing gas to the fluidized bed can further improve the flow of gas into the fluidized bed. By making the gas supply distribution uniform, quality can be stabilized, and by using the fluidizing gas supply structure, the gas supply device can be constructed with a simple structure and at low cost.

Hereinafter, embodiments of the configuration of the present invention will be described based on the drawings.

A preheating machine (1), a reactor (2), and a granulator (3) are installed in parallel to form a production facility for raw materials for glass production (4)
is a conveyor that drops and supplies silica sand to the preheater f1), (5) is a silica sand supply path from the preheater (1) to the reactor (2), and +61 is the silica sand supply path from the reactor (2) to the granulation machine. Machine (
3), and both supply paths (53, +6
In the middle of 1, there is a Sea M bottle (7) to prevent backflow.
).

(8) is interposed.

The preheater (1), reactor (2), granulator (3) and seal pots (71, (81) are silica sand receiving containers (l), respectively.
A).

(2A), (8A), ('Ik'), (8A) are placed in the air at about 20℃ to form a fluidized bed of silica sand! (lA), IA).

A supply path (IB) that supplies (8A), (7A), and (8k) from below.

It has a basic structure including (2B), (8B>, ('IB), and (8B).

The preheater (1) heats the fluidized bed at /100°C to /200°C.
Burner (LC), (LC) and burner (I
C), drop the supplied silica sand with an exhaust gas of (1σ)
It is equipped with a heat exchanger (ID) that heats up to a certain degree.

The reactor (2) includes a fluidized bed stirring blade (2C) driven by a motor, a means for supplying a caustic soda solution to the fluidized bed, and a device for supplying sulfur dioxide to the fluidized bed. It is equipped with In other words, part or all of the surface of the silica sand is converted into sodium metasilicate, and at the same time, the surface is reacted with sodium sulfate to bring it into contact.

The caustic soda supply means forms a liquid spout (9a) on the grade (2C), and a passage (9b) for guiding the caustic soda liquid to the liquid spout (9a) on the blade and the blade rotation shaft (2D). ).

The sulfur dioxide gas supply device includes an emotional air supply path (2
B) is connected to an inlet (10b) for supplying sulfur dioxide supplied via a pipe (10a), so that sulfur dioxide is supplied to the fluidized bed together with fluidized air. There is. In other words, it is configured so that a part thereof is also used as the fluidizing air supply device.

Said granulator (3), C7Repots) +7+, +8
) is well known, so a detailed explanation of its structure will be omitted.

According to the reactor (2) having the configuration of the above embodiment, by supplying the caustic soda solution to the fluidized bed, part or all of the surface of the silica sand is converted into sodium metasilicate having excellent solubility, and the silica sand is supplied to the fluidized bed. When the sulfur dioxide gas is supplied, the sulfur dioxide reacts with the caustic soda, and the dissolution of the silica sand surface improves the wettability of the silica sand. , the raw material for glass production in which sodium sulfite is produced is manufactured, and (1) since the sulfur dioxide that forms sodium sulfate and sodium sulfite is supplied as a gas, the amount of sulfur dioxide supplied can be easily controlled; (2) supplying and mixing the sulfur dioxide gas into sulfurized air uniformly distributed in the fluidized bed to form a fluidized bed;
Since the sulfur dioxide gas is supplied to the fluidized bed together with fluidized air, the sulfur dioxide gas can be supplied to the fluidized bed in a uniformly distributed state. The above-mentioned reactions can be carried out uniformly throughout, and (4) since the reaction between sulfur dioxide and caustic soda is an exothermic reaction, the fluidized bed can be heated by the reaction heat.

There is an effect like this.

Therefore, (a) By the action of (1) above, the amount of sodium sulfate and sodium sulfite relative to silica sand can be easily controlled.
and accurately and accurately; (b) the above (
21. (By the action of 31, it is possible to make a material for glass manufacturing with a uniform distribution of sodium sulfate and sodium sulfite, and as a whole, a homogeneous material with no excess or deficiency of sodium sulfate or sodium sulfite can be obtained. (C) Due to the action of (4) above, the preheating machine (1) can reduce the humidity of the silica sand and reduce the energy consumption required for preheating. .

In addition, since sulfur oxides react with caustic soda, it is possible to use waste gas or carbon dioxide as the fluidizing gas.

A table demonstrating the effect of (C) above, that is, showing the results of a comparative experiment between the case where sulfur dioxide is supplied + phantom and the case where it is not supplied (T3) is attached below.

[Brief explanation of drawings]

The drawing shows an embodiment and is a conceptual diagram of a raw material manufacturing facility for lath manufacturing. (2B)...Fluidization gas supply path, (10b)
・・・・・・Guess supply route・

Claims (1)

[Claims] ■ A reactor for producing a raw material for rough production by supplying an alkaline raw material such as caustic soda to a fluidized bed of silica sand formed by supplying a fluidizing gas and causing the two to react, . A reactor for producing raw materials for glass production, wherein the fluidized bed is provided with a device for supplying gas containing sulfur dioxide, sulfur trioxide, or both. ■ The gas supply device is connected to the fluidization gas supply path (
2B) The reactor for producing raw materials for glass production according to claim 0, wherein the gas is supplied to the reactor for producing raw materials for glass production according to claim 0.