Magazine Article P0202 – View Article in PDF
Details: Published in Fertilizer International, Number 389.
Date: July/August 2002
In the mid-90s several Polish fertilizer plants were identified as among the worst polluters in the country. The World Environment Center, with support from USAID ran a program to demonstration the benefits of projects that reduced emissions and cut waste.
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Paper P0201 –
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Details: Presented at Central Florida AIChE Convention, Clearwater, Florida.
Date: June 2002
Authors:Chuck Snyder and Marten Walters
This paper describe the process routes and imports and exports for producing defluorinated phosphate (DFP), monocalcium phosphate (MCP), dicalcium phosphate (DCP), and feed grade monoammonium phosphate (FMAP).
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Paper P0802 » View PDF
Details: Presented at the Central Florida AIChE Clearwater Conference.
Date: June 2008
Authors: Marten Walters, Thomas Baroody and Wes Berry (K-Technologies)
This paper examines different technologies that can be used to extract uranium oxide (U3O8) from phosphoric acid: Solvent extraction (SX) developed in the 1970’s and 1980’s; and Advanced Technology (AT) that offer simpler processing techniques, lesser equipment requirements, and lower capital and operating costs compared with SX.
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Paper P0003 » View PDF
Details: Presented at IFA Technical Conference, New Orleans.
Date: October 2001
Authors: M. D. Walters, M. B. Ribiero and J. Sinden
A major revamp of a Dorr-Oliver phosphoric acid plant was made. Improvements included removal of the old flash cooler and installation of a Prayon Low Level Flash Cooler, a vacuum pump to replace the steam ejector, and an upgrade of the instruments from pneumatic to a DCS system.
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Paper P0002 – View PDF
Details: Presented at Third Joint China/USA Chemical Engineering Conference, Beijing, China.
Date: September 2000
Authors: P.M. Mathias, C-C Chen, and M. D. Walters
Phosphoric acid reactors have been considered too complex to be modeled on a fundamental basis. This paper demonstrates that these kinds of chemical processes can be modeled and that the benefits in terms of process understanding and rational process improvements are considerable.
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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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Paper P0004 – View PDF
Details: Presented at 11th Fertilizer Latin America International Conference, Cancun, Mexico
Date: April 2000
Authors: Christopher B. Earl
In the 1960’s, it was considered acceptable for phosphate plants to dispose of gypsum and wastewater into the seas and oceans. KEMWorks developed a compliance plan that included a Water Recycle System that will allow the site to reduce the discharges by 95%.
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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 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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