JPS61242944A - Manufacture of construction board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for manufacturing boards for building materials with high fire resistance by effectively utilizing steelmaking slag, which is abundantly produced as an unused resource. .

<Prior Art> As building material boards, gypsum boards and asbestos boards are widely used, and in recent years, boards using perlite, vermiculite, etc. have also been used. On the other hand, although steelmaking slag is produced in large quantities, there are few effective ways to use it because it collapses and expands, and the majority of it is currently disposed of in landfills.

<Problems to be Solved by the Invention> The present invention attempts to manufacture products equivalent to various conventionally used boards for building materials, or even more depending on the application, using steelmaking slag, which is an unused resource, as a raw material. It is.

In order to use steelmaking slag as a building material board, it is necessary to eliminate the collapsing and expanding properties of steelmaking slag due to its composition, and to give it the property of setting and hardening.

For this reason, in the present invention, a modifier made of a silicate substance or the like is added to molten steelmaking slag to cause a melting reaction, and then treated with water slag, and then gypsum, lime, cement, or cement clinker is added to the molten steelmaking slag. In addition, it uses materials that have been given latent hydraulic properties, and its gist is that molten steelmaking slag is mixed with silicate rocks, minerals, weathered materials, karami, glass shavings, foundry waste sand, coal ash, and waste bricks. , red mud, volcanic ejecta, blast furnace slag p desiliconization slag, and a modifier consisting of at least one type of iron oxide are added in an amount of 5 to 30% by weight to cause a melting reaction, and then dried after being treated with water slag. Aluminum sulfate or sodium aluminate is added to a mixed pulverized product obtained by pulverizing, gypsum, lime, and cement or cement clinker, respectively, or by pulverizing the mixture and then pulverizing. This is a method for producing a board for building materials, which is characterized by adding and kneading.

<Examples and effects> The following will show experiments and results conducted to confirm the effects of the present invention.

Table 1 shows the chemical analysis values and properties of the samples used in the experiment.

The steelmaking slag A in Table 1 above is converter slag, and the main minerals contained therein are β and 7-2C according to the results of X-ray diffraction.
a04i0z, F-CaO,2Ca04e203.4
CaO-Ajz03・FezO4, FezO3, Fe)
04. Furthermore, steelmaking slag B was electric furnace slag in the oxidation stage and its main mineral content was the same as steelmaking slag A.Furthermore, steelmaking slag C was electric furnace slag in the reduction stage, and the main mineral content was γ- It was 2CaO-Si02. In addition, the blast furnace water slag, which is also shown for comparison, mainly contains glassy minerals, and its melting thirst was 1320°C.

Table 2 shows the blending ratios (% by weight) of various modifiers added to molten steelmaking slag, and Table 3 shows the melting temperatures of each blend.

The samples shown in Table 2 above were dried in a constant temperature dryer (105-110℃).
After drying for more than 24 hours in a silicone electric furnace (1550-1
560℃) or 300) Remelt 5001Cg each in a CVA L electric furnace, cool in water, make a water slag, and after drying, Blaine value 3100±50ci
/g, mix gypsum 2 lime, cement clinker pulverized p cement, add aluminum sulfate or sodium aluminate as a stimulant, add water and knead, JIS
The material was packed in a mold (4 x 4 x 16e), cured in a humid air, and the strength was measured when the material reached a predetermined axis.

Table 4 shows the chemical analysis values and main mineral content for several types of formulations in this case, and Table 5 shows the strength measurement results.

In addition, in Tables 4 and 5 above, [Prototype slag No.
[corresponds to sample No. J in Table 2. For example, the prototype slag No. 1 is changed from that of sample No. 1, and the prototype slag No. 0 is changed from that of sample No. 010 as described above (remelting →
Shown is what was obtained after the water slag treatment.

From the above experimental results, it has been found that because it is mainly composed of α~β-2CaO-Si02 and has a high melting point, it is easy to form a hardened surface layer and the rate of slag formation is low (compared to steelmaking slag that has collapsibility). When a modifier consisting of a silicate substance such as
It can be seen that the water slag becomes mainly glass and has latent hydraulic properties.

In this case, if the amount of the modifier added is less than 5% by weight, there will be no noticeable effect in modifying the mineral composition, viscosity, and lowering the melting point; If the amount exceeds the amount added, it becomes difficult to maintain the melting reaction only by the sensible heat of the molten slag, so the amount is set at 5 to 30%. There are various methods and times for adding the Sumi modifier depending on the situation at the work site, and if necessary, stirring may be performed using bubbling gas such as oxygen or air.

Next, according to No. 51, which shows the performance as a building material board, prototype No. 7 ~ Wall (Yoto It can be seen that it has sufficient compressive strength and its melting temperature is higher than that of prototype No. 28, which used blast furnace water slag without using steelmaking slag water slag.

Furthermore, it is clear from the results in Table 5 that in the method of the present invention, blast furnace water slag may be used in combination with steelmaking slag water slag.

<Effects of the Invention> According to the present invention, by adding a molten steelmaking slag (ζ modifier), it is possible to lower the viscosity and melting point of the molten steel slag and to ensure a sufficient melting reaction. It is possible to make the composition non-collapsible, and because the melting point is lowered, it is possible to increase the rate of slag formation.And such a slag-treated product ζ gypsum 2 lime.

By kneading cement or cement clinker-1 with aluminum sulfate or sodium aluminate, a building board with high fire resistance and strength can be obtained.

In addition, in the method of the present invention, it is also possible to use it in combination with blast furnace water slag,
It is also industrially useful in terms of effective use of unused resources.

Patent applicant: Nippon Magnetic Separation Co., Ltd. Proxy Ariyoshi Senshu 19a par

Claims (1)

[Claims] 1. Molten steelmaking slag is mixed with silicate rocks, minerals, weathered products, karami, glass waste, foundry waste sand, coal ash, waste bricks, red mud, volcanic ejecta, blast furnace slag, desiliconization slag, and iron oxide. Adding 5 to 30% by weight of one or more modifiers to cause a melting reaction, then drying after treating with water slag, gypsum, lime, and cement or cement clinker are individually crushed. A method for producing a board for building materials, which comprises adding aluminum sulfate or sodium aluminate to a mixed pulverized product obtained by post-mixing or pulverizing after mixing, and adding water and kneading.