Frequently Asked Questions


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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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Approximately 8 weeks after approval of the drawing package.

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.

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.

Yes they can. You will need to utilize a specially prepared patch and repair kit available from Semi-Bulk and use our recommended procedure.

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.

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.

Please contact us here for information on who to call to get system pricing and details.

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Customized Process Xstreamlining Solutions

Semi-Bulk Systems, Inc. is considered a true partner in developing specific processes customized to maximize competitive and profitability positions. Our patented processes; our modular skidded approach to provide a Total Solution for both dry side and dry/liquid mixing; and our focus on providing major benefits vs. traditional processes have revolutionized the markets we serve including BeverageDairyFoodHealth & Beauty, Paint & Coatings, Paper, Power Generation, Chemical Manufacturing and more!

Do you need process improvement to increase efficiency, lower process costs, save labor costs, and increase your bottom line? Our Process XStreamlingsm solutions can help you accomplish these goals.

Semi-Bulk has been installed around the world.

Industries Served