JPS6051518B2 - How to regenerate organic pressure regulating oil - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for regenerating organic pressure regulating oil.

In temper rolling mills that use organic pressure regulating oil, pressure regulating oil is supplied by a spray method, and once used oil is disposed of as is. This is because when used once, foreign matter gets mixed into the rolling oil, which increases the Fe content and ash content and causes deterioration due to changes in the properties of the oil. If this is reused, the surface quality of the copper plate deteriorates and roll defects occur. The main reason is to cause Therefore, the purpose of the present invention is to solve the problem of low function ・ , -M,...-4
A--1-J-f: 11, , Hole 1f■- ↓ By providing a method for recycling and recycling this recycled oil, we have attempted to improve the basic unit.

Regarding unused new oil and used oil after one day of circulation,
Comparing the properties, the results are shown in Table 1.

According to this, there are no major changes in the physical properties and no deterioration is observed, but there is a significant amount of dirt. Furthermore, the present inventors investigated the limit at which the necessary properties of pressure regulating oil are lost, and found that there is a significant relationship with the PH degree of the oil.

For example, regarding the relationship between rust prevention, which is one of the roles of oil, and pH level, the rust prevention effect deteriorates when the pH is below 9. but,
Since the PH value used to determine oil deterioration varies depending on the type of oil, it is necessary to investigate each type of oil in advance through experiments. Table 1 Therefore, we focused on the fact that by removing the Fe content and ash from the used oil, it becomes recycled oil, and that it can be reused by controlling the pH.The regeneration process shown in Figure 1 was Configured.

Oil a1 used in the pressure adjustment process of temper rolling mill 1 is transferred to tray 2.
The oil is collected and passed through a magnetic separator 3 to remove Fe contained in the oil. Next, the oil A2 after Fe removal is passed through a primary filtration step using a filter 4 to remove solids contained in the oil. As filter 4, a filter with a mesh size of 100 μm or less is used, but
A 10μm mesh vapor filter is best. The primary filtered oil A3 is kept in a state where external dust is kept away, and is sent as it is to the settling tank 5, and the sludge contained in the oil is precipitated, thereby temporarily separating the sludge and the oil.

Next, the temporarily separated oil A4 that has come out of the settling tank is sent to a centrifugal separator 6 to completely separate the oil from the sludge that has been subjected to secondary filtration at 5,000 to 6,000 r'Pm. In this secondary filtration process, the sludge waste liquid and the clarified liquid are separated into the secondary filtration liquid, and the secondary filtration oil is left as it is in the supply tank 7.
sent to. The secondary filtered oil sent to the supply tank 7 is already in a state where it can be used as recycled oil, but the used oil at the time it is recovered in the temper rolling process is
It accounts for approximately 60% of the total amount used, and most of the remaining approximately 40% adheres to the surface of the copper plate during pressure adjustment and is taken out. New oil equivalent to approximately 40% of the recovered oil is supplied, and the agitation device 71 ensures uniform quality! Play rolling oil by stirring? get.

This recycled oil A6 is injected and supplied as rolling oil from the nozzle 11 of the temper rolling process, and after use, it is recovered again and thereafter circulated and reused through the same process. Furthermore, the degree of deterioration of the oil is determined by pH measurement. 3 Table 2 shows the results of comparing the properties of the recycled oil treated according to the present invention with new oil and untreated used oil. It can be seen that the removal rate of Fe content and ash content was good, and that the amount and size of the mixed foreign substances were significantly reduced, and the oil was in a state similar to that of new oil.
On the other hand, PH tends to decrease with circulation over time.
As shown in FIG. 2, since it is normally possible to use the oil for about 8 to 9 days, the dump-out (total oil renewal) period can be considered to be about 20 days after the recycled oil is used. Note that this dumpout timing is determined based on the PH measurement results. Continuous measurement is desirable for oil PH measurement, but periodic batch measurements may also be used. According to the present invention, it has become possible to regenerate and recycle the pressure regulating oil, which was conventionally disposed of as waste, resulting in a significant improvement in basic unit consumption, which is lower than the conventional oil consumption per ton of steel production. On the other hand, the oil consumption after implementing the method of the present invention was reduced to 30%.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration of the method of the present invention. FIG. 2 is a diagram showing the change over time in the pH of recycled oil according to the method of the present invention. 1: Temper rolling mill, 2: Tray, 3: Magnet◆
Separator, 4: Filter, 5: Sedimentation tank, 6: Centrifugal separator, 7: Supply tank, 8: New oil tank.

Claims (1)

[Claims] 1 Collect rolling oil during temper rolling into a tray and place it in a magnet.
passing the oil through a separator to remove the Fe content; passing the Fe content removed oil through a primary filtration step using a filter to remove solids; and passing the primary filtered oil through a settling tank to remove oil and sludge. The primary filtered oil after the temporary separation is passed through a secondary filtration process using a centrifuge to completely separate the sludge and oil, and the oil that has undergone the filtration process is led to a supply tank to supply new oil. A method for regenerating organic pressure regulating oil, which comprises obtaining regenerated oil by replenishing and mixing, and controlling oil deterioration by measuring the pH of the regenerated oil.