JPH02179831A - Operating method for temperature-controlled oil-containing iron sludge regenerator - Google Patents

Abstract

PURPOSE:To perfectly prevent an explosion in a heating chamber by heating the heating chamber to a specified temp. range, and keeping the temp. for a specified time at the time of heating oil-contg. iron sludge. CONSTITUTION:The powder of oil-contg. iron or iron oxide, namely the oil- contg. iron sludge, is heated in the heating furnace to remove the oil. In this case, the operation is carried out as described below. Namely, the heating chamber packed with the sludge is firstly heated to 100-120 deg.C, and the temp. is kept for 10-200min. Since an explosion in the heating furnace is perfectly prevented by this method, the operation is stabilized and made safe. The comparison in the number of times of explosion between the operation under the above- mentioned conditions and the operation when the heating chamber is heated to 410-500 deg.C in one step is listed in Table 1.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method of operating equipment used to regenerate oil-containing iron or iron oxide powder generated in the steel industry, etc. be.

(Prior Art) In the hot rolling process of steel, the temperature of the steel material increases, so the surface of the steel plate is oxidized to produce iron oxide, and so-called oxide scale is generated. In addition, fine powder of metallic iron is generated due to friction between the rolling roll and the steel material. Such iron or iron oxide powder contains oil such as lubricating oil used in rolling mills.

Hereinafter, iron or iron oxide powder containing oil will be referred to as "oil-impregnated iron sludge." Since this oil-impregnated iron sludge contains oil, it cannot be used as a raw material for steel as it is.

The following methods can be used to separate oil from oil-impregnated iron sludge and make iron or iron oxide powder usable as a raw material for steel. That is, oil-impregnated iron sludge is heated in a semi-closed container to generate oil vapor, which is then cooled and liquefied to leave oil-free iron or iron oxide powder in the closed container. be. FIG. 1 schematically shows this method.

1 is a heating chamber, into which oil-impregnated iron sludge is filled. Usually, the thickness of this packed bed is between 10 and 1000 m.
It is m. The heating chamber is heated to 410℃ by gas burner 2.
The oil-impregnated iron sludge is heated to between 500°C and 500°C, thereby generating oil vapor from the oil-impregnated iron sludge. This steam rises toward the cooling chamber 3, and when it reaches the cooling chamber, it becomes liquid and accumulates in the oil storage chamber 4.

When this state is maintained for a certain period of time, all the oil contained in the oil-impregnated iron sludge is collected and removed into the oil storage chamber, and iron or iron oxide powder remains in the heating chamber.

However, when regenerating oil-impregnated iron sludge on an industrial scale using the above method, the oil-impregnated iron sludge in the heating chamber may explode while raising the temperature of the heating chamber to 410'C to 500°C, which hinders operations. is causing It also makes the operation dangerous.

(Problems to be Solved by the Present Invention) In view of the above circumstances, the present inventor has developed an operating method that can prevent explosions in the heating chamber when recycling oil-impregnated iron sludge using the above-mentioned recycling apparatus. After repeated research with the aim of achieving this goal, the present invention was completed.

(Means for solving the problem) That is, when heating oil-impregnated iron sludge in a heating chamber, the inventor first sets the temperature of the heating chamber to 100'C to 120''C.
They discovered that explosion inside the heating chamber could be completely prevented by raising the temperature to 1000 and maintaining this state for 10 to 200 minutes.

(Example) In the operation of the oil-impregnated iron sludge regeneration method, the temperature of the heating chamber is first lowered to 1.
The case where the temperature is raised to 00°C to 120°C and this state is maintained for 10 to 200 minutes, and the operation not according to the present invention, that is, the temperature of the heating chamber is raised to 410°C to 50°C all at once.
Table 1 shows a comparison with the case where the temperature was raised to 0°C. Table 1 is
When the operation using each operation method was repeated 20 times,
Indicates the number of explosions.

As can be seen from Table 1: Comparison of operating times, under normal operating methods, explosions occurred 10 times out of 20 operations. In contrast, the operating method according to the invention completely prevents explosions within the heating chamber.

(Effects) As described above, according to the present invention, explosions in the heating chamber can be completely prevented, so operations can be stabilized and made safer, and the industrial value thereof is great.

[Brief explanation of the drawing]

Figure 1 (lower) Explanation of oil-impregnated iron sludge recycling method

Claims (1)

[Claims] In an apparatus for recovering oil and iron from oil-containing iron or iron oxide powder, an operation characterized by setting the temperature of the heating chamber to 100°C at the beginning of the operation and maintaining this state for 10 to 200 minutes. Method.