The powder selector has been in existence for nearly 40 years; its long-term application in actual production has revealed some defects in its classification performance. Particularly after the rubber sand strength test method conforms to global standards, the finished cement fineness control is finer than under the old standard, completing the R45μm sieve classification method and corresponding sieve criteria. Portland cement standards; The powder selection efficiency of Uruxin powder separator's R45μm sieve test is generally only 40%-50%, while the powder selection efficiency can reach over 60%, but some cement products are not promptly organized. The returned materials involved in the internal circulating of the roller press will inevitably experience excessive grinding, leading to a continuous increase in the system's circulating load, making operation adjustment difficult. This results in poor performance of the grinding system, increased power consumption, and higher costs.
The insufficient application of separator in closed-circuit cement grinding systems. This article introduces the application of separators in enhancing the production and energy-saving of double closed-loop grinding systems. It discusses roller presses and the new two-stage selection. Technical advantages of the powder machine.
Due to the low efficiency of the separator, the proportion of finished cement products is repeatedly ground through the bottom cone of the classifier and coarse powder, causing over-grinding during the grinding process, leading to a cycle. It is difficult to establish grinding balance, severely restricting the production of the entire grinding system.
Currently, the combination of powder selection machines and grinding systems accounts for a significant proportion of cement grinding processes; the main reasons for the low powder selection efficiency are:
(1) The unevenness of the diffuser edge material leads to uneven distribution of materials within the powder selection room.
(2) The horizontal helical shell enters the air through two pipes tangentially. The air velocity inside the helical shell is uneven, which cannot create the necessary conditions for material grading, especially when the cement material has a high water content. When the helical shell of the classifier accumulates or the guide vane blades wear out, the internal pressure of the classifier cannot form a uniform and stable airflow field, resulting in a worse classification effect.
(3) The third air channel of the lower cone is too small, resulting in low wind speed and insufficient material cleaning for the lower cone. In a sense, the third air is essentially ineffective.
(4) In fact, the material classification was only done once, and the cleanliness was not high.
