JPS63285134A - Production of glass raw material from blast furnace slag - Google Patents

Abstract

PURPOSE:To readily obtain a glass raw material from blast furnace slag without containing harmful impurities, by jetting pressurized water on molten blast furnace slag, producing a granulated slag, applying a gravity concentration means and removing impurities harmful to the glass raw material. CONSTITUTION:Pressurized water is jetted on molten blast furnace slag to produce a granulated slag, which is then subjected to gravity concentration treatment by using a dry or wet gravity concentration device to remove impurities, such as iron or corundum, harmful to a glass raw material. Thereby the aimed glass raw material is produced from the blast furnace slag. Furthermore, removal of iron can be more surely carried out by subjecting the granulated slag to magnetic separating operation before or after the gravity concentration treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a raw material used in glass production from blast furnace slag.

[Conventional technology]

Conventionally, it has been known to use blast furnace slag as a raw material for glass, and for example, there are the following methods.

1) A method in which the molten slag discharged from the furnace is poured into a pit, etc., where it is naturally cooled and solidified. At this time, impurities are allowed to settle, and only the upper slag with fewer impurities is taken out and crushed, and the iron content is removed by applying it to a magnetic separator. (Tokuko Sho 52-210
No. 03].

A method of injecting water into 2I molten slag and using it as granulated slag, or removing the iron content by magnetic separation.

3) A method in which the +g molten soot slag discharged from the blast furnace is passed through a molten iron separation tank installed in the middle of the slag gutter, where the iron content is separated and the slag still in a molten state is completely pulverized (Japanese Patent Application Laid-Open No. 1983-
No. 124013).

etc.

[Problem that the invention seeks to solve]

However, the conventional method as described above has the following drawbacks. For example, in method 1, since the blast furnace slag is naturally slowly cooled slag, a sufficient crushing operation is required to obtain a constant particle size, which consumes excessive crushing energy and also When blast furnace slag is used as iron, the iron content, which is extremely harmful, is not sufficiently removed by sedimentation, and the solidified slag still contains an average of Fe2O.
The content of 3 is about 1.5%, and even if iron is removed by magnetic separation, the content is only reduced to about 0.8%, so it cannot be said to be satisfactory as a raw material for glass.

In the method of [Mari 2], it is not necessary to crush the iron, but as it is, it contains a large amount of molten iron, and the iron cannot be removed sufficiently by magnetic separation. In addition, corundum (At203), a refractory used in blast furnaces, is usually contained in the slag at a concentration of 4 ppp.
m, which cannot be removed by magnetic separation. Therefore, when used as a raw material for glass, corundum has a high melting point (melting point 2015°C), so it does not burn out and exists in the form of small particles.
This causes defects in the glass.

In addition, in method 3), even though the corundum of the blast furnace refractory settles and is separated together with iron in the process of melting and separation, the slag passes through the refractory gutter before the process of making it into granulated slag. Since the refractory corundum mixed therein remains in the granulated slag, it is not preferable as a raw material for glass as described above.

The present invention solves these conventional problems and provides a method for obtaining an excellent glass raw material from blast furnace slag by reliably removing not only iron and other heavy metals but also corundum.

[Means for solving problems]

That is, the present invention involves injecting pressurized water into molten blast furnace slag to form granulated slag, and then applying a specific gravity beneficiation method to remove harmful impurities as a glass raw material. This is a method of manufacturing.

In the present invention, either a dry type or a wet type gravity concentrator can be applied as the gravity concentrator. Furthermore, if necessary, a step of performing magnetic separation may be added before or after application of the specific gravity separation means, and in this case, iron content can be removed even more reliably.

The present invention will be further clarified with reference to Examples below.

Example 1 Pressure water was injected into the molten slag flow falling from the blast furnace slag to refine the particles and rapidly cool the resulting granulated slag, which was then classified by about 20 meters. Specific gravity separation was performed using MH-551 Model J manufactured by Sogyosha.

The beneficiation conditions are as follows.

Wind speed 0.7-1.3 rn/sec Frequency
60 Q rpm Amplitude 5m Anteroposterior angle 4° Lateral angle 1.5° The sample flows in the direction of the arrow as shown in Figure 1 and is collected at the bottom, and substances harmful to glass raw materials such as iron minerals and corundum are collected in the T1 glass raw material. Usable materials are collected at C.

The Fe2O3 grade and amount of corundum of the recovered glass raw material C were as shown in Table-1. From this result, F
The effect of reducing e2O3 and removing corundum was confirmed.

In addition, since the amount of corundum has a specific gravity of 4.0 to 4.1/-, two types of heavy liquids (specific gravity 3.23 f/m, 4.5
f/eta).

Example 2 Granulated slag classified with 20 mesh was subjected to magnetic field strength of 500
After performing magnetic beneficiation at 0 Gauss, gravity beneficiation was performed using a dry gravity separator under the same conditions as in Example 1. The results are shown in Table-1.

Example 3 After granulated slag was classified with 20 mesh, it was subjected to gravity beneficiation using a dry type gravity separator under the same conditions as in Example 1, and the resulting material was further beneficent by magnetic force at a magnetic field strength of 5000 Gauss. The results are shown in Table-1.

Comparative Example 1 Molten slag approximately 20 tons f 1.2 m x 1.
2 m x 1.4 m deep, about 7? Pour into F/bit 8
It was naturally cooled and solidified for several days.

After solidification, the upper layer up to about 1 m from the surface layer was excavated, crushed with a crusher, and iron content was removed with a magnetic separator with a magnetic field strength of 5000 Gauss.

The results are shown in Table-1.

Comparative Example 2 Water was injected into molten slag to obtain granulated slag, and then iron was removed using a magnetic separator with a magnetic field strength of 5000 Gauss.

The results are shown in Table-1.

Comparative Example 3 The molten slag was remelted at about 1500° C. in a 200° Rusze, and then taken out of the furnace, and only the upper hem of the molten slab was pulverized and recovered using a tilting method.

The results are shown in Table-1.

Table 1 [Effects of the Invention] As described above, according to the method of the present invention, not only iron but also harmful contents, especially corundum, which could not be removed conventionally, can be efficiently removed from blast furnace slag as a raw material for glass with a simple operation. This is extremely beneficial for the use of blast furnace slag.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing an overview of dry specific gravity beneficiation.

Claims (1)

[Claims] 1. Blast furnace slag characterized in that after injecting pressurized water into molten blast furnace slag to form granulated slag, a specific gravity beneficiation method is applied to remove impurities harmful to glass raw materials. A method for producing raw glass from. 2. The method according to claim 1, wherein a magnetic separation operation is performed before or after the gravity beneficiation treatment.