RE: Poly4 vs crushed polyhalite12 Oct 2018 00:38
Verde... Based on the published materials on the web, Poly4 has two specs: Poly4 Power (<1mm) and Poly4 granules (bound using ADM binder into pellets 2-4mm). As the Poly4 pellets have appeared prominently on the company website and in the marketing presentations, Poly4 granules must be the flagship product of SM. The previously mentioned price (125-145 dollar/tonne) in the TorPs much refer to this pellet form. The prices for other forms, either power or other sized rock pieces, must be lower than the Poly4 pellets.
Fertilizers are often in either granular or granulated forms. Granulated fertilizer is the most common form. Although both are granules, granular products are a blend of nutrients as individual granules in their own right. Granulated products are where the nutrients are dissolved to a specific ratio, and then reformed into a new unique granule (http://www.proctorsnpk.com/granular-v-granulated-fertiliser-the-big-show-down).
Currently, although in granulated form, Poly4 granules are bound (using ADM binder) from polyhalite powder only. Such pellets have several advantages over the Boulby’s coated crushed rocks (in either granular 2-4mm and mini granular 1-2mm forms). Poly4 granules can be applied alone, or mixed with proportions of other NPK granular products using simple blending equipment.
For distributors/customers with the equipment to produce granulated products (i.e., to bind all the needed component (poly4, and other NPK) powers into pellets, Poly4 powder should be the best product for them. The main advantage of granulated pellets is the even and accurate proportions of their built-in components in each pellet.
SM did also mention that their products may also include crushed chips (that are bigger than powder), however, so far, I have not seen a product specs on them on the SM website. If SM has such product, as mentioned in the news as coarse product, it might be directly in the crushed form without coatings (as SM may not intend to sell it as a fertilizer product to be applied directly or mixed with other components (see publications on why poly4 pellets better than coated chips)). Such a product might be prepared for those having their own granulating and binding equipment to produce granulated fertilizer products. It may also be sold to those using polyhalite as raw materials for other purposes, e.g., making SOP, soap, glass, animal feed products, or building blocks.