JPH02179830A - Operating method for packed bed thickness-controlled oil-containing iron sludge regenerator - Google Patents

Abstract

PURPOSE:To fix the operating time and thereby to carry out stabilized operation by specifying the thickness of the packed bed when oil-contg. iron sludge is packed in a heating chamber. CONSTITUTION:The powder of iron or iron generated from the steel industry, etc., and contg. oil, namely the oil-contg. iron sludge, is heated in a closed vessel to removed the oil. In this case, the operation for the regeneration of the sludge is made efficient and stabilized by controlling the thickness of the sludge-packed bed to 200-400mm. In addition, the relation between the thickness of the packed bed and the operating time is listed in Table 1.

Description

Detailed Description of the Invention (Industrial Application IP) 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. It is.

(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. That is, oil-impregnated iron sludge is heated in a semi-closed container to generate oil vapor, which is then cooled and liquefied to collect oil-free iron or iron oxide powder in a 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 1 is heated by the gas burner 2 at 410
The oil-impregnated iron sludge is heated to 500"C and generates oil vapor. This vapor rises toward the cooling chamber 3, and when it reaches the cooling chamber, it turns into a liquid and enters the oil storage chamber 4. It accumulates in

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 JrHiJ chamber, and iron or iron oxide powder remains in the heating chamber. Below, 4
The time to maintain the temperature between 10'C and 500'C is called "operating time".

However, when oil-impregnated iron sludge is regenerated on an industrial scale using the above method, the operating time required to completely remove the oil depends on the thickness of the layer of oil-impregnated iron sludge charged into the heating chamber 1. The situation had changed significantly and was causing operational problems.

(Problems to be Solved by the Present Invention) In view of the above circumstances, the present inventor has conducted extensive research with the aim of making the operating time constant and thereby achieving stable operation, and has developed the present invention. I ended up completing it.

(Means for Solving the Problems) That is, the present inventor has found that when filling the heating chamber with oil-impregnated iron sludge, by setting the layer thickness to 200 mm to 400 mm, the operating time is short and constant, and stable operation can be performed. They discovered that.

(Example) In the operation of the oil-impregnated iron sludge regeneration method, the operation time when the thickness of the packed bed of oil-impregnated iron sludge is 200 mm to 400 mm, and the operation time when the packed bed thickness is 10 ml to 20 mm or 800 mm to 1000 mm. A comparison is shown in Table 1. Table 1 shows the operating time and standard deviation of the operating time when the operation was repeated 20 times for each layer thickness.

Table 1 As can be seen from the comparison table of operation time, the layer thickness is 200 mm or more and 400 mm.
It can be seen that when the diameter is less than mm, the operating time becomes shorter and the standard deviation of the operating time becomes smaller, which indicates that efficient and stable operation can be performed.

(Effects) As described above, the present invention improves the efficiency and stabilizes the operation of the oil-impregnated iron sludge regeneration method, and therefore has great industrial value.

[Brief explanation of the drawing]

Figure 1: Explanation of oil-impregnated iron sludge regeneration method

Claims (1)

[Claims] An operating method for an apparatus for recovering oil and iron from oil-containing iron or iron oxide powder, characterized in that the thickness of the packed bed is controlled to 200 mm or more and 400 mm or less.