JPS632841A - Utilization of slag from metal production - 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 The present invention utilizes slag from metal production, particularly silicate slag with high iron oxide content resulting from copper or nickel processes, to produce heat-resistant, fire-resistant or (and) The present invention relates to a method for use in the production of alkali-resistant fiber materials.

Mineral wool is manufactured from fused silicates through a rapid cooling process, resulting in a glass-like structure. In addition to silicates, mineral wool contains, for example, calcium oxide, aluminum oxide, and magnesium oxide.

In addition to the conditions of the mineral wool production process, the qualitative conditions of the mineral wool that are related to the actual use of the mineral wool include, for example, the length and diameter of the fibers, thermal conductivity, fire resistance, and the material used. Besides its homogeneity and glassiness, its inherent weight, chemical resistance and strength.

The glassy nature of mineral wool is an important factor in the final product. The composition of the glass is improved only by, for example, a small energy difference between the crystalline and molten states, a high activation energy in the crystalline form, i.e. a high viscosity in the molten state, and rapid cooling. In addition to this, the composition of the glass is also influenced by the proportion of acid groups in the dissolved state. Therefore, the glass becomes more unstable and highly basic. The viscosity in the silicate state is mainly determined by the size of the anions contained therein.

- As a general principle, it can be said that the viscosity increases as the proportion of complex agent in solution increases. The viscosity increasing agent is, for example, silicon oxide, aluminum oxide, titanium oxide or chromium trioxide. Among alkali oxides, iron oxide and manganese oxide are better liquid agents than magnesium oxide. Furthermore, slags with high magnesium content are less sticky than slags containing calcium.

In the production of mineral wool, surface tension also plays an important role. This is because the molten material must be freely accessible from outside the furnace and disintegrator. A practical guideline for the ratio of viscosity to surface tension is defined as 0.01 or more. Otherwise, the dissolved stream will turn into droplets.

The mineral cotton manufacturing industry has traditionally had a negative attitude towards raw materials containing iron oxides. This is caused by the influence of iron oxide during the manufacturing process. Iron oxide tends to become trapped within the cubera due to the strong temperature dependence of slag viscosity. As a result, 19 particles accumulate at the bottom of the furnace, causing an interruption in operation and destroying the frame of the centrifugal separator. However, if the fire resistance of the mineral wool is to be improved, small amounts of iron oxide are added to the raw material. Additionally, high iron oxide content is generally believed to result in weakening the elasticity of manufactured cotton and generally reducing the protective capacity of the cotton.

The object of the invention is to eliminate some of the drawbacks of the prior art and to provide an improved method for utilizing slag from metal production, in particular from copper and/or nickel processes, as raw material in the production of mineral wool. The important novel features of the invention are apparent from the appended claims.

Slags resulting from copper or nickel processes are usually silicate slags based on ferruginous olivine (2FeO.S + 02) and have a high iron oxide content. Previously,
As mentioned above, this iron oxide content has been an obstacle to the use of these slabs in the production of mineral wool. However, in a new perspective according to the present invention, the use of slag from metal production by mixing in the production of textile materials suitable for high temperatures and reinforcing wire materials suitable for insulation or building materials in the construction industry is highlighted. This is because the mixing process changes the temperature dependence of the material viscosity, and the temperature dependence of the viscosity curve determined as a function of temperature weakens within the temperature range for mineral wool production. Therefore, the process for producing fibrous cotton material can be easily adjusted and the final product is woody homogeneous with the required properties.

According to the invention, the addition of various mixtures to the slag resulting from copper in nickel production increases the relative amount of acid content in the slag. Therefore, according to the invention, aluminum oxide (A1203) or (and) silicon dioxide (S +
02). As a result, materials that can be used in place of asbestos, which basically have a high melting point and strong temperature and alkali resistance, or materials that are suitable for relatively low temperatures1 can be used in place of asbestos, for example, as insulation materials. It is possible to obtain such requests as needed.

Slags suitable for the process of the invention typically have 25 to 40% by weight of silicon oxide2 and 40 to 65% by weight of iron oxide as main components.
, calcium oxide is 0-1o weight 2, magnesium oxide is 0-10 weight 2, and aluminum oxide is 0-15
Contains 2 parts by weight. As mentioned above in the description of the prior art, due to the high iron oxide content of the slag, the slag
Hitherto it has not been used, for example, in the production of mineral wool. Iron oxides are present in slags from copper and nickel production mainly in the form of ferrous oxides bound to silicates, which behave as alkaline components during slag processing; Silicon oxide in the structure is known as an acidic component. Therefore, the addition of silicon oxide and/or aluminum oxide, other oxides that generally act as acids, into the slag changes the ratio of iron oxide to silicon oxide in the slag, which is beneficial for the production of mineral wool. It can be done so that However, observation of the process of the present invention has shown that the iron oxide content must not be reduced below 22 wt 2 in the mineral wool raw material in order to achieve beneficial m-fiber disintegration. Furthermore, it is pointed out that the iron oxide contained in the raw material for mineral wool is advantageously between 22 and 35 weight 2. This is 15 to 15% silicon oxide in slag weight.
35 weight 2 or (and) aluminum oxide 8-15
This is achieved by adding a weight of 2 to the slug.

Due to the variety of components of the slabs used in advantageous applications of the process of the invention, it may also be necessary to add small amounts of other acidic components to the material mixture in order to obtain the desired properties of the final product. Particularly in the production of materials with low mia dissolution temperatures, the addition of silicon oxide increases the mia dissolution temperature in some cases. Other oxides are required to compensate for this increase. Possible substances to be added include, for example, calcium oxide, magnesium oxide or zinc oxide.

The invention will now be explained in more detail with the aid of examples and the accompanying drawings. Figure 0 shows the temperature dependence of the viscosity of a mixture raw material for mineral wool as an example with respect to unmixed slag from metal production. .

According to the figure, curve A represents the temperature dependence of the viscosity of genuine slag from metal production.It is clear from the figure that the temperature dependence of curve A is very strong, therefore, at a given temperature. Figure 0, where fiber disintegration is extremely difficult, is also m
! The range of effective viscosities suitable for the lrs solution is shown to be between 2.5 and 250 poise. A fiber that is effective for controlling the viscosity-temperature dependence of mixture raw materials for use! There was an essential change to disaggregation. This is clearly recognized in the viscosity-temperature dependence curve of the raw material compound of this example. These curves are depicted in the accompanying figures. This shows that the temperature dependence of the raw material compound is inherently weaker than that of slag from metal production. These examples are also preferred embodiments of the invention.

Example 1 Iron oxide 53.0 weight 2. Silicon oxide 32.0% by weight2, magnesium oxide 8-9% by weight, aluminum oxide 2.8% by weight
To a slag containing 2 parts by weight and 1.3 parts by weight of calcium oxide was added 30 parts by weight of silicon oxide. The melting temperature of the slag was 1200 to 12506C, but the melting temperature increased due to mixing. Additional heating was required to achieve fiber disintegration. Job! i Disintegration is achieved at 1500°C, which is the ideal fiber disintegration temperature, which is defined by the temperature-viscosity surface &i (curve mB in the figure) for this raw material mixture of the present invention by measuring operations.
). This resulted in a source with excellent fire resistance up to about 1200°C.

Example 2 The slag of Example 1 was used as an initial material in the production of a low temperature resistant material. To achieve this, silicon oxide and aluminum oxide were added to the slag resulting from nickel production, which was mixed into a molten mixture containing slag 75 wt 2, aluminum oxide 10 wt 2 and silicon oxide 15 wt 2. This mixture was milled according to Example 1 on the basis of curve C in the figure at 1200°C. As a result, the resulting material had a fire resistance of about 900 to 10,006C.

In summary, the present invention uses slag from metal production.

According to the present invention, the acidic components in the slag relate to a method for utilizing silicate slags with high iron oxide content, particularly from copper or nickel processes, in the production of heat-resistant, fire-resistant and/or alkali-resistant fibrous materials such as mineral wool. The temperature dependence of slag viscosity is changed by mixing the slag in such a way that the relative ratio of slag increases.

[Brief explanation of drawings]

The figure shows the temperature dependence of the viscosity of a mixture raw material for mineral wool. Description of part symbols Aoo, viscosity-temperature dependence curve of genuine slabs from metal production Date 01. Viscosity-temperature dependence curve C09 of the raw material mixture in Example 1, Viscosity-temperature dependence curve of the raw material mixture in Example 2 Patent applicant: Outokumpu Oiyoshi, Director, Katori Takao, Takao Maruyama

Claims (1)

[Claims] 1. A method of utilizing slag from metal production, especially silicate slag with high iron oxide content resulting from copper or nickel processes, for the production of heat-resistant, fire-resistant and/or alkali-resistant fibrous materials, comprising: A method of utilizing slag from metal production, characterized in that the temperature dependence of the slag viscosity is changed by mixing such that the relative proportion of acidic components therein increases. 2. The method according to claim 1, characterized in that the iron oxide component contained in the slag is adjusted to 22 to 35% by weight of ferrous oxide (FeO). How to use. 3. In the method according to claim 1 or 2, aluminum oxide or (
and) a method of utilizing slag from metal production characterized by increased silicon oxide. 4. A method according to any one of claims 1 to 3, characterized in that 8-15% by weight of aluminum oxide and 15-25% by weight of silicon oxide are added to the slag. How to use slag. 5. A method using slag from metal production as claimed in claim 1, characterized in that the amount of silicon oxide contained in the slag is increased. 6. A method according to claim 1, 2 or 5, characterized in that 25-35% by weight of silicon oxide is added to the slag from metal production.