High Precision Pumps For Grinding Agent

Operating Principle

The device utilizes a pair of precision-meshed rotating gears; the change in volume between the gear teeth facilitates the suction and discharge of the medium. Each full rotation of the gears delivers a fixed volume of the medium, with the flow rate maintaining a linear relationship to the rotational speed. By integrating a variable-frequency or servo motor-controlled via a 4–20 mA signal-the dosing rate can be automatically adjusted in response to the mill's output. Furthermore, the system can be connected to a Distributed Control System (DCS) to enable closed-loop metering control.

Operating Parameters (Common in the Cement Industry)

- Flow Rate Range: 5 ~ 250 L/h (typical range for cement grinding applications)
- Operating Pressure: 0 ~ 2.5 MPa
- Operating Temperature: ≤80°C (for ambient-temperature grinding aids)
- Wetted Parts Material: Pump body – 316L; Gears – 440C; Sealing – Mechanical seal
- Drive: Servo motor / Variable-frequency motor

Applicable:

Triethanolamine, triisopropanolamine, polymerized alkanolamines, polyols, and composite liquid cement grinding aids.

FAQ

Q1: What are the advantages of using a gear metering pump over a diaphragm metering pump for dosing cement grinding aids?
A: Diaphragm pumps produce significant pulsation, and their diaphragms are prone to swelling and degradation when exposed to alcohol-amine-based grinding aids, necessitating frequent replacements. In contrast, gear pumps provide a pulse-free, continuous, and smooth flow with excellent metering repeatability. They are well-suited for automated dosing integrated with a mill's DCS (Distributed Control System), helping to minimize fluctuations in cement strength and reduce the waste of grinding aids.

Q2: What is the metering accuracy?
A: The factory-calibrated accuracy is ±0.5% to ±1%.

Q3: Which types of grinding aids can be handled?
A: It is suitable for: triethanolamine (TEA), triisopropanolamine (TIPA), DEIPA, polymerized alcohol-amines, and standard composite liquid grinding aids.

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