Paper P8604 – View PDF
Details: Presented at the International Symposium on Phosphogypsum, Miami, Florida
Date: December 1986
Authors: T. J. Kendron and G. M. Lloyd

Davy McKee Corporation (DMC) and the Florida Institute of Phosphate Research (FIPR) have demonstrated a practical process to thermally decompose phosphogypsum and produce sulfuric acid and a saleable, solid byproduct. The process would use the commercially proven DMC circular grate used in over 60 commercial grate designs. A successful phosphogypsum decomposition process will control the costs of sulfuric acid and reduce the impact of phosphogypsum deposits on the environment.
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Paper P8601 – View PDF
Details: Presented at AIChE National Meeting, New Orleans, LA
Date: April 1986
Authors: M. D. Walters and J. V. Galluzzo

Granular ammonium phosphate fertilizers represent a significant portion of the finished fertilizers in use today. Competitive markets and poor economic conditions provide an economic incentive to examine new and old process configurations in an effort to minimize costs and maximize productivity. The major design options proposed or installed are examined for their merit on the basis of the complete mass and energy balance using a proprietary computer program.
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Paper P8502 – View PDF
Details: Presented at Central Florida AIChE meeting
Date: May 1985
Authors: Chris Earl, Armand Davister and Francis Thirion
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Paper P9201 – View PDF
Details: Presented at Phosphate Fertilizer and the Environment, IFDC, Tampa, Florida.
Date: March 1992
Authors: C. B. Earl

Long-term management of process wastes from phosphate mining and chemical processing can be achieved in an environmentally sound manner through integration of the process operations. The proposed Pine Level project is discussed. The project scope is a 4.9 million t/y phosphate mine, 1.1 million t/y P2O5 fertilizer site, 2.3 million t/y Portland cement plant, and a 600 MW coal-fired power plant.
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Paper P9301 – View PDF
Details: Presented at Regional Phosphate Conference, Lakeland, Florida.
Date: October 1993
Authors: M. D. Walters and K. J. Hutter

This paper discusses the 1993 installation of phosacid filter and tank farm fume collection and scrubbing system at the J.R. Simplot fertilizer plant in Pocatello, Idaho. The installation of two new cross flow scrubbing systems resulted in greatly reduced peak concentration of Total Reduced Sulfide (TRS) compounds in the immediate plant vicinity
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Paper P9402 – View PDF
Details: Presented at Regional Phosphate Conference, Lakeland, Florida.
Date: October 1994
Authors: C. B. Earl and M. D. Walters

Are existing phosphoric acid plant cooling ponds an asset or a liability? The use of cooling towers is presented as an alternative to the Central Florida practice of using cooling ponds. The GREEN process (Gypsum Repulp with Enhanced Elutriation and Neutralization) is described. Plant closure costs can be reduced and P2O5 “mined” from the ponds during the operating life of the plant.
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Paper P9501 – View PDF
Details: Presented at Regional Phosphate Conference, Lakeland, Florida.
Date: May 1995
Authors: P. J. Hutter, J. Samuelson, M. D. Walters and C. B. Earl

A rock slurry pipeline was installed at Simplot’s phosphoric acid and began using uncalcined rock slurry. There were problems with P2O5 losses from the flash coolers and scaling in the flash cooler piping. A flash cooler pre-condenser and new vacuum pump system were added and the flash cooler piping and pump modified. The cooling limitation was removed, P2O5 losses were reduced, and significant energy savings were made. Total annual savings of $1.3m were made for an expenditure of about $2m.
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Paper P9801 – View PDF
Details: Presented at Central Florida AIChE Convention, Clearwater, Florida.
Date: Mat 1998
Authors: John Sinden, JEATech, Neil Greenwood, KEMWorks

JEATech and KEMWorks provided basic engineering to Serrana De Minerao Ltda. for a dicalcium phosphate plant. The new operation would use the existing rotary dryer, elevator and screen but would require a new limestone milling and transport section, phosphoric acid storage and handling, reactor and material conveying equipment. The key to the process would be the SPINDENTM reactor which permits agglomeration of the reactants with a low solids recycle ratio.
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Paper P9901 – View PDF
Details: Presented at International Workshop on Current Environmental Issues of Fertilizer Production, Prague.
Date: May 1999
Authors: Marten Walters, KEMWorks Technology, Inc. and Thomas Miller, Cargill Fertilizer, Inc.

In 1992, the World Environment Center (WEC), with financial support from the United States Agency for International Development (USAID), started work in the Baltic countries of Estonia, Latvia, and Lithuania, as well as Poland, to demonstrate the economic benefits of environmentally motivated low-cost waste minimization and cleaner production measures. This paper discusses the results of 15 waste minimization projects in the fertilizer sector in Lithuania and Poland.
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Paper P0001 – View PDF
Details: Presented at Central Florida AIChE Convention, Clearwater, Florida
Date: June 2000
Authors: J. Sinden, M. D. Walters, P. M. Mathias and M. Mendez

This paper discusses how Aspen Plus, a widely used general-purpose simulation system, has been used to analyze the DAP process; approaches are discussed for simulating the different unit operations of this chemical process. In addition, general concepts are discussed for simulating conventional granulation plants.
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