US3819336A - Method of making ultra-fine ammonium ...
A method of making ultra-fine ammonium perchlorate particles by spraying an aqueous ammonium perchlorate solution containing a surface active agent onto a moving film of a refrigerated organic liquid to form fine frozen droplets in said film and recovering fine ammonium perchlorate particles from the frozen droplets by freeze drying. The product particles have weight mean diameters of less ...
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