On-line degasser operation instructions and follow-up maintenance

The first question: Operating Steps of On-line degasser

● Preparation before production ●

1. First confirm whether there is molten aluminum in the degassing tank. If molten aluminum is normal, this step is omitted; When there is no molten aluminum, lift the graphite shaft to the upper limit separately and cover the rotor mouth with asbestos.

2. The inlet and outlet of the degassing box and the discharge port should be sealed. Import and export should be blocked with blanket cotton; The drain should be plugged with asbestos sleeve.

3. In addition to the machine box must be baked to 750-800 degrees. 4. 5-10 minutes before production, lower the graphite rotating shaft to the lower limit-fix the four fixing bolts on the top cover of degassing box-and then start the rotating shaft to run normally.

● In the production process ●

(1) Confirm whether there is fault information or fault alarm in the process of using the ventilator.

1. If the graphite rotor doesn't turn, don't handle it first, and wait until the end of production.

2. If there is a heater failure, the air switch will trip. The corresponding leakage can be turned off first, and the heating device can be directly processed and checked online.

3. In case of low pressure of main gas source and low pressure of total gas source, check whether the flowmeter has a certain flow output-if so, make temporary production first-and then check the gas tank pipeline.

4. If the temperature of molten aluminum is lower than 680 degrees, the fault alarm will alarm all the time. To find the "Deaeration box thermocouple disconnection judgment" key in the screen, select on.

(2) When the equipment is in normal operation: the rotor speed setting: 250-350 revolutions. Rotor flow setting: 3.0-3.5 cubic meters per hour.

Note: If the hydrogen measurement data is not ideal, it can be adjusted appropriately.

● At the end of production ●

1. Clean the molten aluminum in the launder and filter box first.

2. Lift the upper cover of degassing box to the limit of the middle upper cover, and press the left swing button of the column to rotate to a certain angle. Use special slag-fishing tools to fish the aluminum liquid level in the degassing box.

3. After cleaning up the scum in the degassing box, press the right swing button of the column to the left limit, and stop automatically; Press the column lowering button to lower the upper cover to the lower limit.

• If the same aluminum-water alloy is produced in the next furnace, when the heat preservation is continued.The operation steps are as follows:

A, turn on the heating start button: the heating setting in the screen is 760-780 degrees, and the heating is automatically kept in temperature.    

B, turn on the start button of the rotor shaft and the idle button of the rotor for overall heat preservation, and the gas flow rate will automatically be 1.0-1.2 cubic meters per hour.

• If you don't choose to keep warm,The operation steps are as follows

A, salvage the scum in the degassing tank, open the plug and discharge the molten aluminum in the tank;

B, cleaning the aluminum slag in the degassing box;  

C. Lower the top cover of degassing box into place. Take out the four suspenders of the upper cover and lift the graphite shaft to the highest limit. Remember: when the box is empty, the graphite shaft cannot be placed in the box for heat preservation and baking.

D, Wait for the air source to automatically turn off, then cover the rotor mouth with asbestos to prepare for the next oven. If the time of the next oven is uncertain, the oven should be baked one day in advance. If you don't choose automatic oven drying, you can set it manually: 100 degrees every 2 hours.

The second question, simple maintenance of on-line degasser.

The third question: equipment advantages

1. At present, the on-line degasser widely used in aluminum processing has some disadvantages:

(1) "short circuit" of molten aluminum-poor structure;

(2) "bubble combination" of purified gas-low degassing rate, high temperature drop with the same gas consumption;

(3) The particle size of purified bubbles is larger than 1.5mm, and the degassing rate is low;

(4) The monitoring level is low and there are many human factors.

2. Advantages of our equipment:

  In the melting process of aluminum and aluminum alloys, a large number of hydrogen, metallic and nonmetallic inclusions will be produced. If the above harmful substances can't be removed in time before casting, casting defects such as porosity, inclusions and looseness will be formed inside and on the surface of the casting, which will seriously affect the physical, chemical, mechanical and various deep processing properties of the casting and produce a large number of waste products. The traditional flux treatment method not only increases the damage to the environment, but also the traditional refining treatment method can no longer meet the requirements of product quality. Therefore, the purification technology of removing hydrogen, inclusions and harmful elements from liquid metal by physical and chemical principles and corresponding technological measures has developed rapidly in order to obtain clean metal melt.

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