Therefore, optimizing and transforming the cement grinding system is undoubtedly the first choice.

When the second bin is normal, you should be able to hear the swishing sound of the grinding body.

At this time, the grinding body should be added.

If the slope in the curve is not large or there is a long section close to the horizontal line, it indicates that the operation of the mill is poor, and the fineness of the material does not change much during this long distance.

According to the sieve analysis curve, a mill with a reasonable grading and good operation of the grinding body should have a change in the sieve analysis curve that is relatively steep in the first bin and should smoothly descend near the discharge end.

The grading of steel balls is still based on multi-level ball distribution.

In the fine grinding bin, the grinding body should be covered with a thin material layer of 10-20mm.

(2) When the mill produces high output and coarse product fineness, it indicates that the impact force of the grinding body in the mill is too strong, the grinding capacity is insufficient, and the material flow rate is too fast.

At this time, it is necessary to first check whether the width of the partition plate grate hole meets the requirements.

When adjusting the grading of steel balls, it is necessary to consider that the reduction in the size of steel balls is not consistent.

If the impact sound of the first steel ball is particularly loud, it indicates that the average ball diameter of the first steel ball is too large or the filling rate is large; If the sound is dull, it indicates that the average ball diameter of the first steel ball is too small or the filling rate is too low.

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If it is invalid, the length and proportion of the silo should be changed.

It is also possible that due to the improper length ratio of each bin of the mill, the crushing capacity of the front and rear bins does not match the grinding capacity.

Therefore, energy conservation is the basic task of reforming the grinding process.

(1) Principle of energy conservation: Due to the low energy utilization rate of traditional ball mill grinding process, 70% of the electricity consumption in cement production is used for grinding raw materials and cement.

If it is too wide and exceeds the specified value by more than 2mm, it is necessary to replace or plug it; If there is blockage, remove the blockage.

In fact, the grinding process has a significant impact on the quality of products, so the relationship between output, quality, and energy consumption should be fully considered when researching and reforming the grinding process in the future.

Although there are some formulas for the loading capacity and grading of abrasive bodies that can be referenced, they are generally formulated based on experience.

In fact, each of the above methods has certain limitations, because the operation process of the mill is a constantly changing and complex process, with many factors affecting it.

At this time, the average ball diameter and filling rate of the steel ball should be increased.

Under the normal operation and feeding of the mill, according to production experience, half of the steel balls in the ball bin should be exposed on the material surface.

Obviously, if only adding large balls, the average ball diameter will inevitably have a trend of increasing.

The trend of the two curves should be consistent.

3.

Therefore, a well managed cement enterprise adopts the traditional method of regular warehouse clearance.

For example, according to the literature, when a 90mm steel ball is worn to 80mm, compared to the same period last year, the 80mm steel ball is worn to 71.11mm, the 70mm steel ball is worn to 63.20mm, and the 60mm steel ball is worn to 56.20mm.

The impact crushing effect within the mill is weakened, while the relative grinding ability is enhanced.

Check the material condition in the mill.

Conduct inspection and analysis based on the mill output and product fineness.

Therefore, it is necessary to appropriately change the grading of the grinding body or clear the warehouse to remove the broken and small ball segments; If the percentage of screen residue before and after the partition plate varies greatly, it indicates that the capacity of the two silos is unbalanced.

It is easy to make mistakes in judgment, resulting in blind ball filling, which can affect the output of the mill.

(3) If the output of the mill is low and the product fineness is fine, the reason may be that there are too many small steel balls and too few large steel balls.

(4) If the output of the mill is high and the fineness of the product is fine, it indicates that the loading capacity and grading of the grinding body are reasonable.

If the cover material is too thick, it indicates that the loading capacity of the grinding body is insufficient or the grinding body size is too small.

Improving production and reducing power consumption of cement grinding systems have always been the focus of attention, especially after the implementation of ISO standards, most cement enterprises feel that it is necessary to adapt their products to the quality requirements of the new standards without affecting mill production and increasing production costs.

When using a grading liner, the average particle size of the material at each point in the internal length direction (from the feed end to the discharge end) of the grinding bin gradually decreases, and the average ball diameter of the steel balls at each point should also gradually decrease.

In addition, there are various methods to determine the amount of grinding body supplement based on the comparison between the ammeter value of the main motor and the empirical value during air grinding.

The reason may be that the grading, loading capacity, and average ball diameter of the grinding body are not suitable.

The principle of grinding process transformation In the past, research on grinding technology mainly focused on increasing mill output and reducing grinding power consumption.

1.

(1) When the mill has low output and coarse product fineness, it indicates that the loading capacity of the grinding body is insufficient or the grinding body abrasion is too large.

The method for determining the supplement amount of grinding bodies (1) Multiply the grinding body wear amount per unit product (annual consumption of similar grinding bodies/annual output of the grinding machine) by the output of the grinding machine stage; (2) Multiply the grinding body wear amount per unit time (annual consumption of similar grinding bodies/annual operating time of the grinding machine) by the stage operating time of the grinding machine; (3) Stop grinding after necessary air grinding, measure the height of the ball (segment) surface within the mill from the center line of the mill, divide by the effective inner diameter of the mill, and easily calculate the current filling rate.

Compare the filling rate with the original ball preparation, and calculate the ball filling amount.

(2) Improving the output of grinding equipment based on the principle of high production is the basic goal of reforming and improving the grinding process.
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Firstly, investigate the grading, loading capacity, and average ball diameter of the grinding body.

Whether the loading capacity and grading of the grinding body are reasonable can be checked and adjusted in production practice through the following four methods.

At this time, it is necessary to appropriately reduce large balls, increase small balls and steel sections to improve grinding capacity, while reducing the gap between grinding bodies, slowing down the flow rate of materials in the mill, and extending the residence time of materials in the mill, in order to obtain sufficient grinding.

According to the grinding sound, it is judged that under normal feeding conditions, the impact of a steel ball in a silo is strong and there is a clatter sound.

If the steel ball is exposed too much, it indicates that the loading capacity is too high or the average ball diameter of the steel ball is too large; On the contrary, it indicates that the loading capacity is too small or the average ball diameter of the steel ball is too small.