IP Library › Granted Patent US 12,330,186
Granted Patent B2
US 12,330,186 · App. 16/178,684 · Granted Jun 17, 2025

Continuous mixers and methods of using the same

Inventors: Spyridon Monastiriotis (Houston, TX); Anthony Paul Haddock (Houston, TX)
Assignee: PREFERRED TECHNOLOGY, LLC
B05D1/002B01F27/111B01F27/112B01F27/70B01J2/10C09K8/805B01J2/006B05D2502/00B05D2503/00B05D2504/00B05D2507/00
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Quick Facts
Patent No.
US 12,330,186
App. No.
16/178,684
Granted
Jun 17, 2025
Kind
B2
Abstract

The disclosure provides continuous mixers and methods of using thereof including in the production of coated particles and proppants used in hydraulic fracturing techniques, by the application of coatings along the length of the continuous mixer through the use of a plurality of paddles configured within the continuous mixer.

Claims (27)

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.

2. The method of claim 1 , wherein the sand particles move from the inlet to the outlet in an average time from about 2 seconds to about 15 seconds.

3. The method of claim 1 , wherein the sand particles are coated at a rate of 3000 pounds per minute.

4. The method of claim 1 , wherein the first mixer further comprises at least a second dosing port operably connected to the mixer.

5. The method of claim 4 , wherein the method further comprises mixing the annulus of sand particles with a second coating composition that is fed into the mixer through the second dosing port.

6. The method of claim 1 , wherein the gas is injected with the coating composition.

7. The method of claim 1 wherein each paddle of the plurality of paddles of the first mixer has an orientation from about −45 degrees to about +45 degrees in relation to the horizontal axis of the rotating shaft.

8. The method of claim 7 , wherein each paddle has an orientation of −45 degrees, 0 degrees, or +45 degrees or wherein the plurality of paddles are oriented at −45 degrees.

9. The method of claim 1 , wherein the plurality of paddles of the first mixer are grouped into an inlet zone, a middle zone, and an outlet zone.

10. The method of claim 9 , wherein the plurality of paddles in the inlet zone are oriented randomly at either −45 degrees, 0 degrees, or +45 degrees.

11. The method of claim 9 , wherein all of the paddles in the inlet zone are oriented at 0 degrees or at +45 degrees.

12. The method of claim 1 , further comprising at least a second mixer arranged in parallel with the first mixer, such that sand particles are fed into the inlet of the first mixer at or approximately at the same time as sand particles are fed into an inlet of the second mixer.

13. The method of claim 12 , further comprising the steps of:

heating the sand particles to a first temperature in a container;

feeding the heated sand particles from the container into the inlet of the first mixer and the inlet of the second mixer, such that heated sand particles are fed into the inlet of the first mixer at or approximately at the same time as heated sand particles are fed into the inlet of the second mixer.

14. The method of claim 1 , wherein the first coating composition comprises a polyol and the second coating composition comprises an isocyanate, wherein the first and second coating compositions coat the sand with a polyurethane coating.

15. The method of claim 14 , wherein the first or second coating composition comprises a silane.

16. The method of claim 1 , wherein the heated sand is at a temperature of about 190 to about 220 degrees Fahrenheit.

17. The method of claim 1 , wherein the gas comprises one or more of air, oxygen, nitrogen, carbon dioxide, and catalysts.

18. The method of claim 1 , wherein the gas comprises one or more of air, oxygen, nitrogen, and carbon dioxide.

Assignments (3)
SECURITY INTEREST Recorded Dec 28, 2020
From: PREFERRED TECHNOLOGY, LLC
To: ALTER DOMUS (US) LLC, AS ADMINISTRATIVE AGENT
Reel/Frame 054752/0323 →
SECURITY INTEREST Recorded Aug 22, 2019
From: PREFERRED TECHNOLOGY, LLC
To: BANK OF AMERICA, N.A.
Reel/Frame 050133/0940 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 5, 2018
From: MONASTIRIOTIS, SPYRIDON; HADDOCK, ANTHONY PAUL
To: PREFERRED TECHNOLOGY, LLC
Reel/Frame 047680/0038 →
Continuity (2)
Provisional Application 62580708 · Nov 2, 2017
Related Publication 20190126314A1 · May 2, 2019
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