3 Standard Compound Dosing System in mass finishing

Choose the correct compound dosing system is very important for the desired finishing. Today, most compounds are formulated in liquid form.

There are mainly three compound dosing systems mostly used in industry. Bellow, I will share the general idea with you.

1. Batch compound system

The batch methods refer to the addition of concentrated compounds to the mass of water, media, and parts. Usually, the drain is kept closed until the cycle is complete. After process finishing, the drain is open and the mass flushed with clean water.

The batch compound system is the simplest dosing system. It is commonly used in the process which process time is shorter or the wear debris does not affect the finishing. For example, porcelain media polishing steel parts use the batch compound system.


Vibratory finishing compound batch process
Vibratory finishing compound batch process


2. The Compound flow-through System

The compound flow through system also called as compound open-loop recirculation system. It is the most cost-effective way if it in a correct control.

To keep costs under control, flow-through compounding requires an accurate and automatic mixing of the compounds, a controlled flow rate, and the introduction of the solution to the process in a correct location.


compound flow through system vibratory finishing
compound flow through system vibratory finishing


In a compound flow-through system, liquid pump in and run away constantly. Therefore, the water level in the vibratory bowl keeps at the same level. For example, stainless steel media ball burnishing use compound flow through the system. During the burnishing process, dirt and wear debris flushed away with flow-through water. After polishing, you will see parts surface is shinier than other two compound systems.


3. The compound close-loop recirculation system

Recirculation reduces or eliminates the effluent from the vibratory process. Recirculation includes compound discharge, filtering system, and compound dosing system to recharge effluent. Because each time parts of the compound are left in the sludge, so you need to compensate a little compound each cycle.


compound close-loose system vibratory finishing
compound close-loose system vibratory finishing


Ceramic media deburring steel parts typically use this compound dosing system. This system saves water and compound. However, parts surface is not as shining as other two compound systems.

The closed-loop recirculation system is also used in the area where wastewater treatment cost is high. As parts come from this system is not shine, so they may need an extra cleaning process.


4. Conclusion:

There are three compound dosing systems for mass finishing equipment. Each process has its application and performance.


Compound dosing systemWater consumptionChemical consumptionParts surface conditionSkill Required
Batch Compound systemMiddleMiddleMiddleLow
Compound flow-through systemHighHighHighHigh
The compound close-loop recirculation systemLowLowLowHigh


Above, we make the drawing regarding the compound system to compare the cost and finished parts surface conditions.