| CPC B05D 1/002 (2013.01) [B01F 27/111 (2022.01); B01F 27/112 (2022.01); B01F 27/70 (2022.01); B01J 2/10 (2013.01); C09K 8/805 (2013.01); B01J 2/006 (2013.01); B05D 2502/00 (2013.01); B05D 2503/00 (2013.01); B05D 2504/00 (2013.01); B05D 2507/00 (2013.01)] | 18 Claims |
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1. A method of producing coated sand particles comprising:
injecting a gas into one or more dosing ports of a first mixer,
feeding heated sand particles that are at a temperature of about 185 to about 260 degrees Fahrenheit into an inlet of the first mixer, the first mixer comprising an outer wall and a single auger comprising a rotating shaft and a plurality of paddles connected to the rotating shaft,
wherein the single auger of the first mixer is rotating at a rate of about 300 rotations per minute (RPM) to about 1200 RPM to form an annulus of sand particles positioned along the interior surface of the outer wall of the first mixer and moving the sand particles towards an outlet of the first mixer, wherein the gas fills a space in the center of the annulus of sand particles in the first mixer;
mixing the annulus of heated sand particles with a first coating composition and a second coating-composition,
wherein the first coating composition is fed into the mixer through a first dosing port operably connected to the first mixer and the second coating composition is fed into the mixer through a second dosing port operably connected to the first mixer; and
discharging the coated sand particles through the outlet,
wherein the sand particles are coated at a rate of at least 3000 pounds per minute.
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