How do you control the dosing of powders?

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Discussion Overview

The discussion revolves around methods for accurately dosing powdered chemicals into a liquid tank, focusing on automation and control mechanisms. Participants explore various approaches and technologies relevant to this application.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about achieving accurate dosing of powdered chemicals using a machine design that incorporates a hopper and PLC for automation.
  • Another suggests pelletizing the ingredient or diluting it with an inert powder to minimize dosing errors, and mentions using a stepper motor with a screw feed for control.
  • A different participant recommends searching for weigh feeders, noting that while many are designed for large quantities, smaller versions exist for powders.
  • One participant highlights potential challenges associated with handling fine powders, indicating that smaller volumes may present unique issues.
  • Links to various powder dosing equipment are provided by another participant as potential resources for the original inquiry.

Areas of Agreement / Disagreement

Participants present multiple approaches and suggestions, indicating a lack of consensus on a single solution. Various methods and technologies are proposed, reflecting differing opinions on the best practices for dosing powdered chemicals.

Contextual Notes

The discussion does not resolve specific technical challenges related to the handling of fine powders or the precise requirements for the dosing mechanism, leaving these aspects open for further exploration.

kunalvanjare
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Hello guys. Sorry if this sounds like a stupid question. I have tried searching for a similar application but couldn't find something that fit my requirements.

My design of the machine requires accurate control in dosing of a powdered chemical into my liquid tank.

The powder will be stored in a hopper or a small tank above the liquid tank. I need to dose accurate (well almost accurate) amounts of the powder as per the quantity of liquid in the tank and some other parameters.

The quantity will be decided by the operator and fed into the PLC. Automation should control the dispensing of powder into the tank.

How do I achieve this?
 
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Pelletize your ingredient and dose pellets. Alternatively you could dilute the ingredient with another inert powder so that dosing errors are minimized. Stepper motor controlling a screw feed should be all you need for powdered ingredients. You might look at pharmaceutical type solutions and the equipment they use.
 
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Search weigh feeder. The first hits are for coal at tens of tons per hour, but they are also made for powders in small quantities.
 
Some problems of handling fine powders (your application may require much smaller volumes; hence, different problems):



:cool:

 
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