Patents Assigned to Mississippi Lime Company
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Patent number: 11878913Abstract: A system and method of removing grit and contaminants from a lime oxide flour where the lime oxide flour begins as a standard lime flour which has a particle-size distribution of greater than 90% minus 100 mesh and less than 80% minus 200 mesh. The standard lime flour is then refined via classification to a refined lime flour which has greater than 80% minus 200 mesh. The refined lime flour may then be used for formation of lime hydrate at end-user on site production where it is typically less reactive to slaking water temperature variations.Type: GrantFiled: October 18, 2021Date of Patent: January 23, 2024Assignee: Mississippi Lime CompanyInventors: Michael S. Stever, Martin Gran, Randy Griffard, Gerald Kevin Bequette, Nathan T. Hooper
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Patent number: 11865583Abstract: Systems and methods to effectively sort calcined lime (quicklime) particles to produce products with more consistent size and burn time characteristics after the quicklime particles have been created and without the use of specialized additives. Specifically, such systems and methods sort the quicklime particles below a selected size into a softer burned and harder burned fraction based on their size. The fractions are burned in the kiln together and as a singular product, but can be classified from each other after calcining.Type: GrantFiled: April 8, 2019Date of Patent: January 9, 2024Assignee: Mississippi Lime CompanyInventors: Mark DeGenova, Randy J. Griffard, David Venhaus
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Patent number: 11772980Abstract: Systems and methods for impurity removal to limestone using modifications to the typical calcination process of turning calcium carbonate into calcium oxide prior to slaking to produce calcium hydroxide. Specifically, substantially increasing the temperature to 1100° C. or higher and increasing soak time can result in reductions in certain undesirable impurities, particularly with regards to lead and lead compounds.Type: GrantFiled: August 3, 2022Date of Patent: October 3, 2023Assignee: Mississippi Lime CompanyInventors: Martin L. Gran, Randy Griffard, Mary Grass
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Patent number: 11673115Abstract: A hydrated lime product exhibiting superior reactivity towards HCl and SO2 in air pollution control applications. Also disclosed is a method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles. The resultant lime hydrate product has available CaOH of greater than 92%, a citric acid reactivity of less than 20 seconds, a BET surface area greater than 18, a D90 less than 10 ?m, a D50 less than 4 ?m, a D90/D50 less than 3, and a large pore volume of greater than 0.2 BJH.Type: GrantFiled: March 22, 2021Date of Patent: June 13, 2023Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Gerald K. Bequette, William S. Allebach, Sr., Paul J. Ramer
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Patent number: 11656117Abstract: A rotary airlock test and demonstration setup, system, and method allowing for rotary airlocks to be tested for air leakage, wear, and particularly for inconsistent wear. The system allows for testing of the rotary airlocks on site utilizing a truck mounted system and even in situ should a portion of the air path for the testing be part of the pneumatic conveyor the rotary airlock would be used with.Type: GrantFiled: May 14, 2020Date of Patent: May 23, 2023Assignee: Mississippi Lime CompanyInventors: Gerald K. Bequette, Nathan T. Hooper, Randy Griffard, Martin Gran
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Patent number: 11603318Abstract: A hydrated lime product which can be provided to an end user in dry form and which can be formed into a slurry which will comprise lime hydrate with sufficiently increased reactivity over that of traditional hydrated lime slurries to be competitive in reaction time with on-site produced slaked lime slurries.Type: GrantFiled: February 13, 2020Date of Patent: March 14, 2023Assignee: Mississippi Lime CompanyInventors: Martin L. Gran, Randy Griffard, Michael Stever, Kory Mueller, Nathan Hooper, Scott Sipiorski
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Patent number: 11572306Abstract: A method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles.Type: GrantFiled: June 18, 2020Date of Patent: February 7, 2023Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Gerald K. Bequette, William S. Allebach, Sr., Paul J. Ramer
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Patent number: 11420878Abstract: Systems and methods for impurity removal to limestone using modifications to the typical calcination process of turning calcium carbonate into calcium oxide. Specifically, substantially increasing the temperature to 1100° C. or higher and increasing soak time can result in reductions in certain undesirable impurities, particularly with regards to lead and lead compounds.Type: GrantFiled: February 19, 2020Date of Patent: August 23, 2022Assignee: Mississippi Lime CompanyInventors: Martin L. Gran, Randy Griffard, Mary Grass
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Patent number: 11365150Abstract: Systems and Methods to produce a lime hydrate sorbent composition formed of highly reactive lime hydrate (HRH) by adding compounds to the slaking water in a method that would produce a non-HRH, which will typically be a lime hydrate having citric acid reactivity as discussed above of more than ten seconds, to make the non-HRH an HRH, which is having a citric acid reactivity of less than or equal to ten seconds.Type: GrantFiled: July 15, 2019Date of Patent: June 21, 2022Assignee: Mississippi Lime CompanyInventors: Randy Griffard, Martin L. Gran, William S. Allebach, Paul J. Ramer
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Patent number: 11311839Abstract: Systems and methods for the use of highly reactive hydrated lime (HRH) in high temperature flue gas streams, namely those at greater than 400° F., such as are present before an air preheater (APH) to remove sulfur trioxide (SO3) from the flue gas.Type: GrantFiled: September 4, 2015Date of Patent: April 26, 2022Assignee: Mississippi Lime CompanyInventors: Curt Biehn, Randy Griffard, Mark DeGenova, Eric Van Rens, Pat Mongoven
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Patent number: 11148149Abstract: Systems and methods for generation of lime hydrate compounds and particularly highly reactive hydrated lime (HRH) with a reduced resistivity through the inclusion of a sodium compound generally in the slaking water used in generating the lime hydrate or HRH. The compound may then be used in systems which include a Electrostatic Precipitator (ESP) for SO2 mitigation without many of the associated problems in ESP performance.Type: GrantFiled: December 28, 2018Date of Patent: October 19, 2021Assignee: Mississippi Lime CompanyInventors: Martin L. Gran, Randy Griffard, William S. Allebach, Paul J. Ramer
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Patent number: 10960379Abstract: A hydrated lime product exhibiting superior reactivity towards HCl and SO2 in air pollution control applications. Also disclosed is a method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles. The resultant lime hydrate product has available CaOH of greater than 92%, a citric acid reactivity of less than 20 seconds, a BET surface area greater than 18, a D90 less than 10 ?m, a D50 less than 4 ?m, a D90/D50 less than 3, and a large pore volume of greater than 0.2 BJH.Type: GrantFiled: December 27, 2019Date of Patent: March 30, 2021Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Gerald K. Bequette, William S. Allebach, Sr., Paul J. Ramer
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Patent number: 10723654Abstract: A method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles.Type: GrantFiled: October 2, 2019Date of Patent: July 28, 2020Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Gerald K. Bequette, William S. Allebach, Sr., Paul J. Ramer
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Patent number: 10688500Abstract: Systems and methods for the use of highly reactive hydrated lime (HRH) in circulating dry scrubbers (CDS) to remove sulfur dioxide (SO2) from the flue gas.Type: GrantFiled: July 20, 2018Date of Patent: June 23, 2020Assignee: Mississippi Lime CompanyInventors: Curtiss Biehn, Randy Griffard, Mark Degenova, Eric Van Rens
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Patent number: 10668480Abstract: Systems and methods for the use of highly reactive hydrated lime (HRH) in circulating dry scrubbers (CDS) to remove sulfur dioxide (SO2) and other acid gases from the flue gas.Type: GrantFiled: December 11, 2018Date of Patent: June 2, 2020Assignee: Mississippi Lime CompanyInventors: Curtiss Biehn, Randy Griffard, Mark Degenova, Eric Van Rens
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Patent number: 10590003Abstract: A chemical processing method to increase the brightness of a naturally sourced GCC. The process described herein employs a persulfate under certain heating and stirring conditions to effect a brightness change which can be on the order of about 8 points on the GE brightness scale and can move a GCC which is under a GE level of 80 to above a GE level of 80.Type: GrantFiled: August 24, 2018Date of Patent: March 17, 2020Assignee: Mississippi Lime CompanyInventors: Sean Dingman, Kory Mueller
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Patent number: 10549256Abstract: A hydrated lime product exhibiting superior reactivity towards HCl and SO2 in air pollution control applications. Also disclosed is a method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles. The resultant lime hydrate product has available CaOH of greater than 92%, a citric acid reactivity of less than 20 seconds, a BET surface area greater than 18, a D90 less than 10 ?m, a D50 less than 4 ?m, a D90/D50 less than 3, and a large pore volume of greater than 0.2 BJH.Type: GrantFiled: November 14, 2014Date of Patent: February 4, 2020Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Gerald K. Bequette, William S. Allebach, Sr., Paul J. Ramer
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Patent number: 10457598Abstract: A method of providing highly reactive hydrated lime and the resultant lime hydrate where an initial lime feed comprising calcium and impurities is first ground to a particle-size distribution with relatively course particles. Smaller particles are then removed from this ground lime and the smaller particles are hydrated and flash dried to form a hydrated lime, which is then milled to a significantly smaller particle size than that of the relatively course particles.Type: GrantFiled: March 28, 2018Date of Patent: October 29, 2019Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Gerald K. Bequette, William S. Allebach, Sr., Paul J. Ramer
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Patent number: 10307728Abstract: A sorbent composition with improved acid gas reactivity comprising calcium hydroxide particles is provided. In the calcium hydroxide composition, about 90% percent of the calcium hydroxide particles are less than or equal to about 10 microns; the ratio of 90% of the calcium hydroxide particles below a specified size to the ratio of 10% of the calcium hydroxide particles above a specified size is less than about 8; and the calcium hydroxide particles have a BET surface area of about 18 m2/g or greater.Type: GrantFiled: November 4, 2016Date of Patent: June 4, 2019Assignee: Mississippi Lime CompanyInventors: Randy J. Griffard, Mark G. Degenova, Stephen C. Schweigert, Gerald K. Bequette, William S. Allebach, Zhichao Richard Zhang, Curtiss R. Biehn
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Patent number: 10307766Abstract: Systems and methods to effectively sort calcined lime (quicklime) particles to produce products with more consistent size and burn time characteristics after the quicklime particles have been created and without the use of specialized additives. Specifically, such systems and methods sort the quicklime particles below a selected size into a softer burned and harder burned fraction based on their size. The fractions are burned in the kiln together and as a singular product, but can be classified from each other after calcining.Type: GrantFiled: May 2, 2016Date of Patent: June 4, 2019Assignee: Mississippi Lime CompanyInventors: Mark DeGenova, Randy J. Griffard, David Venhaus