JP2002115021A - Vanadium-nickel iron alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide V-Ni iron alloy in which the conents of V is >=20%, and the content ratio of V/Ni is >=1.0, produced by melting and reducing boiler slag and flue cinders generated in the combustion of petroleum fuel, together with an iron source and flux. SOLUTION: An iron source and flux are added to boiler slag and flue cinder. This mixture is melted in a combustion type melting furnace, and a reducing material such as silicon and aluminum is added reduce each oxides of V, Ni and Fe in the melt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a V-Ni for steel raw material produced effectively from boiler slag and smoke ash generated when burning heavy oil, crude oil, vacuum residue, asphalt, orimulsion, petcoke and the like. It is intended to propose a ferroalloy.

[0002]

2. Description of the Related Art In a boiler using a petroleum-based fuel such as heavy oil, incombustible substances contained in the fuel adhere to a wall and a bottom of the boiler in the form of a so-called boiler slag. Further, a part of the incombustibles is discharged from the boiler as smoke, so-called soot, together with the unburned carbon, and is collected by a dust collector to prevent air pollution.

[0003] Boiler slag and smoke ash contain valuable metals such as V and Ni, but especially smoke ash has a low bulk specific gravity and is difficult to treat unburned carbon. Therefore, some companies recover only V from some of these raw materials, ie, boiler slag or smoke ash, but most of them are landfilled after detoxification, or sent to a cement manufacturer and treated in a cement kiln. That was the fact.

With respect to the method of recovering V from these raw materials, Japanese Patent Application Laid-Open No. Sho 62-298489 discloses a method for producing vanadium pentoxide, which is a raw material of ferrovanadium, by a wet alkali extraction method. But,
Such an alkali extraction method is long and complicated.
Therefore, the equipment cost is high, there are many auxiliary agents to be used, and valuable V and Ni are not recovered in an effective form such as used directly for steel. Also V
Yields were not always satisfactory.

[0005]

V is an effective element for improving the heat resistance and high-temperature corrosion resistance of steel, and has been used mainly in high-alloy steels such as heat-resistant steel and high-temperature corrosion steel. V has the effect of dramatically increasing the strength of steel with a small amount of addition. In recent years, low alloy structural steel, pipe, spring steel, tool steel, etc. It has come to be used in large quantities. Many of the above-mentioned steel types have V and Ni added at the same time, and when such a steel type is manufactured, usually, V is used separately as ferrovanadium and Ni is used separately as ferronickel as an additive. I have. In other words, the use of two types of additives requires the preparation of two sets of charging hoppers and cut-out hoppers, which also increases the labor.

Therefore, the present invention advantageously solves the above-mentioned problems involving boiler slag and smoke ash, recovers V and Ni from boiler slag and smoke ash by a dry process with good yield, at low cost, and at the time of producing steel. It is an object of the present invention to propose a ferromagnetic alloy containing V and Ni as the main components in the most convenient form.

[0007]

Means for Solving the Problems Boiler slag and smoke ash are sufficiently mixed with an iron source such as scale and a flux such as quicklime, and then introduced into a combustion type melting furnace, where they are heated and melted to form a molten slag. After taking out the molten slag in a melting furnace or another container, a reducing agent such as silicon or aluminum is added to reduce V, Ni, Fe, etc. in the molten slag to produce V and Ni. It is easy-to-use alloy iron as a component. Incidentally, if the V content of the ferroalloy is too low, the addition amount is increased, and the temperature of the molten steel is lowered. Therefore, the minimum content of V is desirably 20% or more.
In addition, most steel types in which V and Ni are added simultaneously have a larger Ni addition amount than the V addition amount. However, in steel companies, V, N
i Since some steel grades are set to the same level, V / N
The i content was set to 1.0 or more.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to FIG. Boiler slag 1 and smoke ash 2 by-produced when burning a petroleum fuel are thoroughly mixed in a mixer 6 together with an iron source 3 such as scale and a flux 4 such as quick lime, and then introduced into a combustion type melting furnace 8 to mix these. To make slag. V, Ni, F in this molten slag
In order to reduce the oxide of e, one or two or more reducing agents such as ferrosilicon, metallic silicon, and aluminum are added, a reduction reaction is performed, and then V-Ni manufactured by specific gravity separation. Alloy. This V-Ni alloy iron is designed to have a V content of 20% or more and a V / Ni content ratio of 1.0 or more in consideration of convenience in use. If the Ni content is insufficient, Ni
The problem can be solved by supplying Ni-based waste 5 such as contained waste catalyst to a combustion type melting furnace.

[0009]

EXAMPLES The chemical compositions of boiler slag and smoke ash used were as shown in Table 1.

[Table-1]

[0010] boiler slag, Kemurihai and 500kg respectively scale, 4,500 kg, and 50kg prepared, after thoroughly mixed in a mixer at introduced natural gas to swirl the combustion melting furnace having a melting capacity of about ¹ Ton _{/ Hr} It was melted by burning. The melted slag was held in a melting furnace, and after all the above-mentioned raw materials were melted, 370 kg of ferrosilicon prepared in advance was added little by little, and Ar gas was blown into the slag and sufficiently stirred. In this test, flux such as quicklime was not used all at once to reduce the melting load. After the reduction reaction was completed, both the metal and the slag were taken out, cast into a mold, and separated by specific gravity.

The same test was performed three times.
2 were obtained.

[Table-2]

A total of 1,510 kg of V-Ni alloy iron was obtained.
crushed to a diameter of mmφ, brought to a steel company, V, Ni
It was used without any trouble when it was used during the production of the contained structural alloy steel. In addition, the yield of V and Ni was almost the same as that of the case of using a combination of ordinary ferrovanadium and ferronickel.

Thus, according to the present invention, when producing steel that requires V and Ni at the same time, it is not necessary to prepare both a V additive material such as ferrovanadium and a Ni additive material such as ferronickel. -There is an advantage that the trouble of storing can be saved. Further, since a small amount of V is added to structural alloy steels and the like, if ordinary ferrovanadium is used, it takes a long time for melting because of its high melting point, and there is a problem in uniform diffusion. However, this V-Ni alloy iron has a melting point of about 1,450.
Since the temperature is as low as ° C., such a problem does not occur. Furthermore, V-
Since Ni alloy iron can be produced only by a combustion type melting furnace, there is also an advantage that an extremely inexpensive V and Ni additive can be supplied to a steel company. Therefore, it greatly contributes to reduction of steel production costs.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a manufacturing process of the present invention.

[Explanation of symbols]

 1. Boiler slag 2. Smoke ash 3. Iron source 4. Flux 5. Ni-based waste 6. Mixer 7. Reducing material 8. Combustion type melting furnace 9. V-Ni alloy iron 10. Slug

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Katsumi Numa 2-4-2, Tsubocho-cho Minami, Fukuyama-shi, Hiroshima (72) Inventor Hiroshi Fukuoka 5--17-13 Hanakoganei, Kodaira-shi, Tokyo F-term (reference 4K001 AA19 AA28 BA12 BA14 DA01 HA04

Claims (4)

[Claims] 1. A method in which a raw material comprising one or both of boiler slag and smoke ash by-produced during the combustion of a petroleum fuel is mixed with an iron source, guided to a combustion-type melting furnace, and added with a reducing material after melting to produce. A vanadium nickel alloy iron. 2. The vanadium-nickel alloy iron according to claim 1, wherein the vanadium content is 20% or more, and the vanadium / nickel content ratio is 1.0 or more. 3. The vanadium nickel alloy iron according to claim 1, wherein the flux is supplied to a combustion type melting furnace to produce the same. 4. The vanadium according to claim 1, wherein one or more selected from nickel-containing waste catalyst, nickel-containing plating sludge and nickel ore are supplied to a combustion melting furnace. Nickel alloy iron.