Powder vs. Slurry: Magnesium Hydroxide Shipping & Logistics

Technical-grade magnesium hydroxide is primarily shipped in two consistencies: powder and slurry. While the solid form, MgOH(2) powder, is the more common shipping selection for a variety of industrial applications, MgOH(2) slurry, the liquid form, is a popular choice, especially for wastewater treatment as a safe alternative to caustic soda or lime.


A number of considerations should be carefully weighed in selecting a final shipping format for technical-grade magnesium hydroxide.

When to Order Powdered, Dry Magnesium Hydroxide


Option for mixing equipment on site

1. Long Distances/High Volume

The added weight of water in a slurry mixture increases freight costs when shipped cross-country or internationally. In bulk shipments, technical grade powder is often preferred, allowing for nearly double the content of magnesium hydroxide at the same volume.


If the application specification calls for slurry, mixing equipment can be provided.



2. Low Volume

Regardless of distance, technical-grade dry material can be aptly mixed in a drum with the added benefit of controlled settling for small-batch shipping and receiving.




3. Electrical Power Constraints On-Site

Powdered magnesium hydroxide does not require constant agitation as compared to the liquid slurry, reducing the need for high-energy machinery upon arrival.


4. Concentration Variety

In industrial applications where a myriad of magnesium hydroxide concentration ratios are needed, dry powder is the preferred format due to superior accuracy and greater ease of material segregation due to slurry’s tendency to settle over time.



5. Flexible Shipping Methods

In general, powdered Mg(OH)2 can be shipped via more versatile and flexible transport options, including:

Flatbed Hauler with Super Sacks
  • Bulk pneumatic trucking

  • Super Sacks

  • Standardized 50lb bags

  • Flat-bed hauling

  • Reefer truck or van

  • LTL or partial load

  • Container/ocean freight

  • Railway or train



When to Order Liquid, Magnesium Hydroxide Slurry


1. Immediacy

Technical-grade Mg(OH)2 slurry is ready to use, eliminating any time delay between arrival and application.


2. Limited Equipment

If the receiving facility does not have the industrial equipment necessary to mix Mg(OH)2 dry powder with the appropriate amount of water to create technical-grade slurry, professionally pre-mixed slurry is an ideal alternative.




3. Reduced Manpower

Industrial locations vary in their staffing. Ready-made liquid slurry is optimal for sites with fewer employees or reduced manpower.


4. Established Infrastructure

Technical-grade slurry requires constant agitation. Facilities should have correct, operational in-house equipment to prevent settling. If needed, Garrison Minerals has the expertise and manufacturing capabilities to assist with appropriate storage and dosing equipment to optimize the product and application specifications.


One of many options for equipment set up

5. Short Distances/Lower Volume

With the added volume and weight, liquid slurry shipments are recommended for receiving organizations within a 250-mile radius to a distribution site. This typically amounts to one-day freight trip.


Even the smallest wastewater treatment plant needs pH adjustment and added alkalinity derived from magnesium hydroxide, and whether shipping a small volume to a rural plant or to a large plant in a densely populated urban area, logistics should be considered.


6. Shipping Options

Liquid slurry is most often shipped by:

  • Tanker

  • Tote

  • Drum

Optimizing Freight Costs


All technical-grade magnesium hydroxide products are application-dependent. Despite shipping conditions, dry or liquid form may be necessary for specific end-product. For example, flame retardants typically require dry powder. Alternatively, as noted above, wastewater applications often necessitate slurry.


Garrison Minerals will work with you and your team to determine the best material and most efficient shipping method for your circumstances.

Contact us today for expert recommendations and a detailed freight estimate.

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