FAQ

Semi-Bulk Systems can help you optimize your process efficiencies and achieve lower manufacturing costs. We offer the most efficient and modular processes for Powder Handling and Powder/Liquid Mixing - a TOTAL Solution!

Frequently Asked Questions
  1. What powder convey and mixing rates can be achieved with a Semi-Bulk VACUCAM® Ejector Mixer
  2. How do you control the powder flow rate?
  3. Is there a limit to how far powder can be conveyed with the VACUCAM® Ejector Mixer?
  4. I understand how the VACUCAM® Ejector Mixer process works in theory, but can I actually see it working?
  5. What is the liquid capacity range for the VACUCAM® Ejector Mixer?
  6. What process modes are possible with the VACUCAM® Ejector Mixer?
  7. Do you vary the liquid flow rate through the Mixer to control the powder inhalation rate into the VACUCAM® Ejector Mixer?
  8. How is the Air-Pallet Container grounded?
  9. What is viscosity limit on the liquid inlet side of the VACUCAM® Ejector Mixer?
  10. What does a one-day demo cost and what is included?
  11. Where can we do testing?
  12. What is an Air-Pallet Container?
  13. How long does it take to fabricate and assemble a fill machine?
  14. What is the average life of an Air-Pallet? Container?
  15. Can the Air-Pallet Containers be rehabilitated?
  16. Can holes in an Air-Pallet Container be patched?
  17. What materials can be handled in an Air-Pallet Container?
  18. Are Air-Pallet Containers D.O.T. approved?
  19. Who and where do we contact for further info?
ANSWERS TO QUESTIONS
Q1:     What powder convey and mixing rates can be achieved with a Semi-Bulk VACUCAM® Ejector Mixer?
A:     Powder convey and mixing rates depend on the characteristics of the powder being handled, specifically, its liquid demand, as well as the diameter and length of the convey hose. Maximum powder convey and wet rates could be as high as 5 lbs of powder per gallon of liquid pumped through the VACUCAM® Ejector Mixer. Lower rates are designed into the system for thickening agents and low solids mixtures.

Q2:    How do you control the powder flow rate?
A:    Powder flow rate can be controlled with careful selection of the diameter and length of the powder convey hose. A controlled rate feeder (either volumetric or gravemetric) can be used if accurate control of the powder flow rate is required.

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Q3:    Is there a limit to how far powder can be conveyed with the VACUCAM® Ejector Mixer?
A:    There is a practical limit of convey distance with each powder. Light powders, like silica, can be conveyed 150 feet or more at a rate of 75-100 pounds per minute, while others, like certain pigments, require much shorter convey distances, i.e. 10 – 15 feet. The desired powder rate and distances for the convey are carefully reviewed during the system application process.

Q4:   I understand how the VACUCAM® Ejector Mixer process works in theory, but can I actually see it working?
A:   Yes. We can demonstrate our mixing technology in our Pilot Plant, either with standard powders or with customer provided materials. See the Literature Request page and request information on Pilot and Field Trails.

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Q5:    What is the liquid capacity range for the VACUCAM® Ejector Mixer?
A:    We have 3 housings: The A Mixer (50-75 GPM) the B Mixer (75-150 GPM) and the C Mixer (250-1000 GPM) with powder convey and disperse rates matched from 1 to over 1000 pounds per minute.

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Q6:    What process modes are possible with the VACUCAM® Ejector Mixer?
A:    Single Pass – The liquid passes through the VACUCAM® Ejector Mixer only once to inhale the desired amount of powder.
Batch Recycle – The liquid and slurry is recirculated through the VACUCAM® Ejector Mixer until the desired amount of powder has been added into the liquid.
Continuous Steady State – The liquid is recirculated through the VACUCAM® Ejector Mixer into a mix tank until the desired powder/solids ratio is achieved. This liquid/slurry is then sent off to the process while continuing to add liquid into the mix tank to maintain this ratio.
See the VACUCAM® Ejector Mixer section of our web page for more details.

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Q7:    Do you vary the liquid flow rate through the Mixer to control the powder inhalation rate into the VACUCAM® Ejector Mixer?
A:    No. The powder is allowed to reach its own steady state flow rate into the mixer. This rate can be modified through the use of different size convey lines, mixer bodies, orifices, etc. If it is desired to change the powder/liquid mix on the fly, a steady state control scenario can be used. This would adjust the amount of liquid being added into a mixing tank to give the desired solids/liquid mix ratio.

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Q8:   How is the Air-Pallet® Container grounded?
A:   The sidewall material of the container is conductive. The sidewall material is affixed to the base with a metal main clamp. When filling or unloading an Air-Pallet® Container, you connect a building ground to this main clamp, thereby grounding the entire Container, preventing build-up of static electricity.

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Q9:   What is viscosity limit on the liquid inlet side of the VACUCAM® Ejector Mixer?
A:   The limit of the liquid viscosity being pumped through the VACUCAM® Ejector Mixer is approximately 5000 centipoise (Cps).

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Q10:   What does a one-day demo cost and what is included?
A:   The charge for testing depends upon the hazardous nature of the liquids and powders used and the batch sizes. To get a price sheet and detailed information, go to the literature request page and click on Pilot and Field trial information. We’ll send you an email with all the details.

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Q11:   Where can we do testing?
A:   We have a compete test facility in St. Louis, MO where we can simulate the VACUCAM® Ejector Mixer slurry processes and the Air-Pallet® Container fill, pneumatic transfer and unload processes. Our lab is equipped to handle flammable solvents as well as difficult powders. Contact Iris Freidel, Ron Bentley or Jeff Doherty for additional details.

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Q12:    What is an Air-Pallet® Container?
A:    The Air-Pallet® Container is a FIBC, designed for the environmentally and ergonomically sound shipping and handling of dry powders. A unique returnable, reusable, flexible packaging system providing a totally enclosed environment for filling, transporting and unloading. The Air-Pallet® Container is DOT and U.N. approved for reuse when transporting hazardous chemicals.See the Air-Pallet® Container section of the web page for additional details and request the Air-Pallet® Container brochure download from the literature request page.

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Q13:   How long does it take to fabricate and assemble a fill machine?
A:   Approximately 8 weeks after approval of the drawing package.

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Q14:    What is the average life of an Air-Pallet® Container?
A:    The average life depends upon the care taken in handling the Pallets. A forklift will win every time. With that in mind, the average life of an Air-Pallet® Container is approximately 5 years. We have customers with fleets over 7 years old that have yet to be rehabilitated.

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Q15:    Can the Air-Pallet® Containers be rehabilitated?
A:    Yes, unless the Container is completely crushed, we can repair and re-certify the Container for a fraction of the cost of a new one. Request our rehab information for more details.

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Q16:    Can holes in an Air-Pallet® Container be patched?
A:    Yes they can. You will need to utilize a specially prepared patch and repair kit available from Semi-Bulk and use our recommended procedure.

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Q17:    What materials can be handled in an Air-Pallet® Container?
A:    As the Air-Pallet® Container will have residual powder (<0.25 kg) remaining from the unload process, it is suitable for materials that do not become rancid, or where minor cross contamination is not an issue. Products shipped in the Air-Pallet® Container include colored pigments, dyes, various grades of filter carbon and carbon black, PVC resin, metal catalysts, lead, nickel, starch, filter aids, diatomaceous earth.

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Q18:    Are Air-Pallet® Containers D.O.T. approved?
A:    Yes, they are approved for the use and re-use for transportation in commerce of solid hazardous materials, Packaging Groups II or III, authorized by 49 CFR 172.101 and Part 173 to be shipped in UN13L2 FIBC’s; specifically hazardous class / division 4.1, 4.2, 4.3, 5.1, 6.1, Class 8 and Class 9 as appropriate.

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Q19:    Who and where do we contact for further info?
A:    Please see our Contact Us page for information on who to call to get system pricing and details.

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