JP3122895B2 - Granulated slag fine powder composition, its production method and cement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finely divided granulated slag composition, a method for producing the same, and a cement comprising the finely divided granulated slag composition. The present invention relates to a granulated slag fine powder composition using shot cotton or waste cotton, which is an industrial waste produced as a by-product during product production, as a raw material, a method for producing the same, and cement.

[0002]

2. Description of the Related Art Granulated slag fine powder, which has been conventionally known, is obtained by crushing granulated slag obtained by quenching and crushing blast furnace slag, which is a by-product of producing pig iron in a blast furnace, with water. It is widely used as a hydraulic material such as a cement mixture. Rock wool is a material obtained by adding a suitable amount of siliceous raw material to blast furnace slag and melting it at a temperature of about 1400 to 1500 ° C., and fibrillating by spinner, air blowing or the like. Widely used for such purposes. At the time of rock wool production or rock wool product production, waste cotton such as shots, shot cotton, and chips is by-produced. Among them, shot cotton is a rock wool that contains a large amount of a substance (shot) that is not fiberized and granulated during the manufacture of rock wool, and is selected from product rock wool by a sieve or the like. In recent years, the processing has become a serious problem (Japanese Unexamined Patent Publication No. Hei 3-4730).
No. 2).

[0003] At present, these shots and waste cotton are rarely used, and most of them are treated as industrial waste. Therefore, we tried to crush the shots and waste cotton and use it as a cement mixture, but the fine powder obtained by crushing the shots and waste cotton was converted into finely ground slag powder obtained by grinding the granulated slag. As a result, the basicity was low, and it was found that it could not be practically used as a hydraulic material.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for effectively utilizing shots and waste cotton, and more specifically, granulated slag fine powder using shots and waste cotton as a raw material. It is to provide a composition. In particular, it is to provide a granulated slag fine powder composition that can be used as a hydraulic material. Another object of the present invention is to provide a method for producing a granulated slag fine powder composition using shots and waste cotton as a raw material. Another object of the present invention is to provide a cement mixture using the finely divided granulated slag powder composition of the present invention.

[0005]

The present inventor has conducted studies to solve the above-mentioned problems. As a result, the inventor mixed and crushed shots and cotton wool with granulated slag, and crushed shots and cotton wool. By mixing the fine powder obtained by grinding the granulated slag with the granulated slag fine powder obtained by crushing the granulated slag, and finding that it can be used as a hydraulic material. Focusing on the fact that the basicity and the particle size structure affect the hardness, the inventors have found that the adverse effect of the decrease in the basicity due to the use of shots and waste cotton can be suppressed by controlling the particle size structure, and completed the present invention.

That is, the present invention is a granulated slag fine powder composition obtained by mixing granulated slag fine powder and rock wool fine powder. Also, the granulated slag or the granulated slag coarse powder is mixed with a shot or waste cotton by-produced at the time of rock wool production or rock wool product production, and the mixture is pulverized or pulverized and classified to have a Blaine specific surface area of 3,000 cm. ² /
g or more of the granulated slag fine powder, the method for producing a granulated slag fine powder composition, particularly using a granulated slag having a basicity of 1.8 or more, and a basicity as shot or waste cotton. This is a method for producing a finely ground granulated slag composition, wherein a finely ground granulated slag composition having a basicity of 1.75 or more is obtained using 1.2 to 1.7. Further, the cement is characterized by mixing fine granulated slag powder and fine powder of shot or waste cotton by-produced during the production of rock wool or the production of rock wool products.

Hereinafter, the present invention will be described in detail. The granulated slag used in the present invention is a blast furnace slag in a molten state generated when pig iron is produced in a blast furnace, which is quenched with water and then dehydrated, and is made of calcium oxide (CaO), silicon dioxide (SiO ₂ ), It contains components such as aluminum oxide (Al ₂ O ₃ ) and magnesium oxide (MgO). Granulated slag fine powder obtained by crushing granulated slag is widely used as a hydraulic material such as a mixture for blast furnace cement. For reference, an example of a chemical composition of a general granulated slag is shown in Table 1. In addition, as a factor indicating the quality of the performance of the granulated slag or the granulated slag fine powder as a hydraulic material or its raw material, there is a basicity calculated from the content of each component by the formula 1, and a mixed material for blast furnace cement is used. Granulated slag fine powder having a basicity of 1.8 or more is suitable. The granulated slag used in the present invention has a basicity of 1.8.
More preferably, it is 1.85 or more.

[0008]

[Table 1]

[0009]

[Formula 1] (CaO + Al ₂ O ₃ + MgO) / SiO ₂

Rock wool is produced by mixing the blast furnace slag with a siliceous raw material, melting the blast furnace slag at a temperature of about 1400 to 1500 ° C., and fiberizing the blast furnace slag with a spinner or air blowing. In the production of rock wool, granulated substances (shots) are produced as by-products without being fiberized. However, if shots are mixed into products, they lead to deterioration in quality. The product from which rock wool (shot cotton) is removed is referred to as product rock wool. Further, when rock wool is formed to produce a rock wool product, chips are produced as by-products.

[0011] These waste cotton such as shot cotton and chips are made of calcium oxide (CaO), silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ),
It contains components such as magnesium oxide (MgO), and the basicity according to the formula 1 is usually less than 1.75. Therefore, the fine powder obtained by pulverizing shots and waste cotton has a lower hydraulicity than the fine powder of granulated slag obtained by pulverizing granulated slag. For reference, an example of the chemical composition of a common shot cotton is shown in Table 2.

[0012]

[Table 2]

According to the present invention, shots or waste cotton are used as a part of the raw material of the finely divided granulated slag composition. Specifically, a raw material in which shot or waste cotton is mixed with granulated slag is crushed, or granulated slag coarse powder, for example, granulated slag powder having a Blaine specific surface area of 1000 cm ² / g or more obtained from granulated slag is used. or shot or Kuzuwata or grinding a raw material obtained by mixing a Blaine specific to surface area 3000 cm ² / g or higher, preferably 4000 cm ² / g or more water-granulated slag composition, granulated slag, for example, granulated slag The specific surface area of the obtained brane is 3000 cm ² / g or more, preferably 400
Fine powder obtained by pulverizing or pulverizing and classifying granulated slag fine powder of 0 cm ² / g or more and shot or waste cotton, preferably a Blaine specific surface area of 3000 cm ² / g or more, preferably 4000 cm ²
/ G or more of fine powder. If the Blaine specific surface area is less than 3000 cm ² / g, the hydraulic property is poor. In the present invention, there is no limitation on the method of pulverizing the raw material obtained by mixing the shot or the waste cotton or the shot or the waste cotton, and a tube mill or a roller mill generally used for pulverizing granulated slag can be used. If a ball mill such as is used, the fiber parts of the waste cotton may be clumped and become difficult to be crushed, so it is preferable to use a roller mill such as a vertical roller mill to grind the waste cotton such as shot cotton. .

In the present invention, the higher the mixing ratio of the shot or the cotton wool, the lower the basicity of the obtained granulated slag fine powder composition and the lower the hydraulic property.
It is preferable that the mixing ratio of the shot or the waste cotton be appropriately specified depending on the performance required for the granulated slag fine powder composition to be produced. Specifically, the basicity of the granulated slag fine powder composition is set to 1.75 or more, preferably 1.8 or more. The amount of shot or waste cotton or these fine powders is usually 1 to 5 per granulated slag or granulated slag fine powder.
0% by weight, preferably 1 to 30% by weight, more preferably 1 to 30% by weight
15% by weight.

When the raw material obtained by mixing shot cotton or waste cotton is subjected to closed-circuit pulverization by a roller mill having a separator or the like, the basicity of the obtained granulated slag fine powder composition is increased as the fineness of the obtained powdered slag fine powder composition is increased. When producing a finely ground granulated slag fine powder composition, even if the mixing ratio of shot cotton and scrap cotton is increased, the relatively high A slag fine powder composition can be obtained. According to the results of various experiments performed by the present inventor on the method of closed-circuit pulverization of the raw material mixed with shots or waste cotton, when industrially implemented, the pulverization conditions are set to the obtained granulated slag fine powder composition. The content of the product passing through a 6 μm sieve is 28 to 60% by weight, and the content passing through a 16 μm sieve is 50%.
~ 95 wt%, Blaine specific surface area 3000-7000
cm ² / g preferably to control such that the 4000~7000cm ² / g, from the viewpoint of such as hydraulic and grinding efficiency of the resulting granulated slag composition.

The granulated slag fine powder composition of the present invention can be used as a hydraulic material such as a mixture for blast furnace cement or a raw material of slag alkaline cement, similarly to granulated slag fine powder produced from granulated slag.

The present invention is also effective from the viewpoint of pollution problems and effective utilization of resources in recent years when the treatment of industrial waste has become a social problem. In addition, as a raw material of the fine rock wool in the present invention, rock wool itself, for example, rock wool such as discarded rock wool product can be used in addition to shots and waste cotton.

[0018]

EXAMPLES 5 to 40% by weight of shot cotton (basicity 1.45) having the chemical composition shown in Table 2 with respect to granulated slag (basicity 1.89) having the chemical composition shown in Table 1 Mix,
Closed circuit pulverization was performed using a vertical roller mill with a built-in airflow classifier to produce finely ground granulated slag. To 44 parts by weight of each obtained granulated slag fine powder, a Blaine specific surface area of 3200 was used.
53 parts by weight of clinker powder (cm ² / g) and 3 parts by weight of gypsum dihydrate were blended to produce a blast-furnace cement type B trial, and 200 parts by weight of fine aggregate and water were added to 100 parts by weight of each blast-furnace cement type B. JIS for mortar composition blended with 65 parts by weight
A compression strength test was performed according to R5201. Table 3 shows the characteristics of the granulated slag powder and the results of the compressive strength test of the mortar composition. In addition, as a comparative example, the results of a compressive strength test of a mortar composition using a blast furnace cement B of the same level as a commercially available blast furnace cement B are shown.

From the results shown in Table 3, it can be seen that the mortar based on the blast furnace cement B using the granulated slag fine powder of the present invention as a mixed material has the same strength characteristics as the mortar based on the commercially available blast furnace cement B. .

[Table 3]

[0020]

According to the present invention, granulated slag fine powder useful as a hydraulic material is obtained by using shots and waste cotton, which is an industrial waste by-produced during the production of rock wool or rock wool products, as a raw material. A composition can be manufactured. In addition, the cement mixture using the granulated slag fine powder composition of the present invention is used as a cement mixture despite the fact that shots and cotton wool, which are industrial wastes produced as by-products during rock wool production, are used as raw materials. It has the same performance as conventional granulated slag fine powder.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuhiko Tsukamoto 2-3-4 Nakai, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture (58) Field surveyed (Int. Cl. ⁷ , DB name) C04B ^7/ 00- 28/36

Claims (5)

(57) [Claims] A fine powder of granulated slag is mixed with fine powder of shot or waste cotton produced as a by-product during the production of rock wool or a product of rock wool, and has a Blaine specific surface area of 3000.
A granulated slag fine powder composition having a cm ² / g or more. 2. A granulated slag or granulated slag coarse powder is mixed with a shot or waste cotton by-produced during the production of rock wool or during the production of a rock wool product, and the mixture is crushed or crushed and classified to form a brane. Specific surface area 3000cm ² /
A method for producing a finely-divided granulated slag powder characterized by obtaining at least g of finely-divided granulated slag powder. 3. The grinding of the mixture is performed by closed-circuit grinding.
The content of the 6 μm sieve passing amount is 28 to 60% by weight, the 16 μm sieve passing amount is 50 to 95% by weight, and the Blaine specific surface area is 300.
The process according to claim 2 water granulated slag composition according obtaining 0~7000cm ² / g of water-granulated slag composition. 4. The basicity of the granulated slag is 1.8 or more, the basicity of shot or waste cotton is 1.2 to 1.7, and the basicity of the granulated slag fine powder composition is 1.75. The method for producing a granulated slag fine powder composition according to claim 2 or 3, which is the above. 5. A cement comprising fine granulated slag powder and fine powder of shot or waste cotton by-produced during the production of rock wool or during the production of rock wool products.