Why is the vertical mill set up the return system? What is the main role of the return system?

Date: 2019-07-09 Views:

The first thing to do is to figure out how the mill works and then solve the problem.

The working principle of the slag vertical mill will be described in detail in the third part of “Operation Management”. Here we only talk about the working principle of the part related to the return.

The return material is the raw material in the mill. The milled material enters the wind ring over the retaining ring. Some of the larger particles and higher density materials cannot be blown up by the hot air, falling into the lower body of the mill, and scraping through the scraping plate. Material outside the mill.

Because the slag contains about 1 铁 of iron, this part of the iron is separated from the slag, and the material after the iron is re-grinded.

Iron selection is one of the main purposes of setting up a returning system.

There are other roles that will be discussed later.

In order to solve the above problem, the returning system is set.

1, out of the mill.

The returning mill adopts a heavy hammer valve or a straight-through slipper, and the chute has wear-resisting measures to ensure that there is no problem of wear and leakage in a running year.

2. Monitoring.

There are video monitoring or flow monitoring devices to accurately observe or measure the amount of return and return.

3. Horizontal delivery.

The current environmental protection requirements are strict, so the preferred type of sealing scraper is used for the delivery of the grinding material.

In the past, the open belt conveying method caused secondary dust, and it was difficult to meet increasingly strict environmental standards. It is better to wait for the environmental protection to shut down the shutdown.

4, vertical lifting.

The bucket is made of high-temperature resistant (≥150°C) steel wire tape type, equipped with deviation, slip, blockage detection, central control display, alarm, and jump.

5. Framework.

Set the bucket and the feeding belt frame, the total height of the frame exceeds the bucket, the top is semi-sealed and rainproof, and the electric hoist is set up for maintenance, as shown in the figure:

6, in addition to iron.

After the material is returned to the bucket, the tee is set, and the three-way enters the sealed rotary type iron remover, and the two stages are opposed to each other, and the iron (iron powder) temporary storage bin is set.

At present, most of the returning process is to set up a first-stage belt self-unloading iron remover in the return belt. My process plan is a three-way + two-stage opposite-sealed rotary type iron remover.

Why are you setting this up? First: prevent dust, second: very important, please contact me.

7, into the grinding.

Adopt independent air lock to prevent grinding and mixing with raw materials:

Avoid causing secondary dusting;

Avoid mixing raw materials in the grinding equipment and returning materials, causing the board to block the material;

Avoid raw material moisture entering the return hopper along the chute, resulting in sticking of the binder.

8, the pit.

The 3% slope of the bucket floor is drained to the surrounding area, the surrounding drainage trough, and a collecting well (not less than 600×600×600), and a fixed automatic control sewage pump is installed.

Two A, sprinkler system.

The difference between slag mill and other mills is that there is also a sprinkler system. The principle and function of the slag mill are not mentioned here. It will be explained clearly in the following “operation management”. Only the process plan and equipment configuration are mentioned here.

According to different specifications of the mill, the system pipe diameter is Φ32~50mm, and the pipe and equipment have the same pipe diameter.

The water can be directly taken from the head of the cooling system to stably maintain the system water pressure of 0.3~.05MPa. If the system water pressure is unstable, the pressure pump is separately set.

Standard configuration: 1 inlet shut-off valve, 2 quick-cut valve, 3 electric flow valve, 4 electromagnetic flowmeter, 5 bypass.

The outlet tee, the 7 main roads are sprayed into the mill, and the 8 roads are connected to the grinding device, and the solenoid valves are respectively installed.

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