Phosphoric acid production gypsum filtration flocculant pre-dilution (make down) with post-filtration phosphoric acid
AssigneeNalco Company
InventorsRonald V. Davis, Wayne L. Moss, Michael G. Strominger, Randon Renzello, Thomas A. Faigl, Daniel N.T. Hay
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Abstract
A method for minimizing the addition of water to a phosphoric acid production process is described. The method uses phosphoric acid to make down a flocculant that is added to the process in order to promote filtration or clarification of crude phosphoric acid. Preferably, the phosphoric acid is a crude, clarified phosphoric acid that is recycled from the phosphoric acid production process itself.
Claims15
A method of adding an effective amount of flocculant to a phosphoric acid production process, the method comprising the following steps:
- providing phosphoric acid;
- injecting the effective amount of flocculant directly into the phosphoric acid;
- mixing the effective amount of flocculant and the phosphoric acid to create a flocculant-acid substance;
- introducing the flocculant-acid substance into the phosphoric acid production process.
A method of improving solids separation performance in a phosphoric acid production process, the method comprising the following steps:
- providing phosphoric acid;
- introducing an effective amount of flocculant directly into the phosphoric acid, the effective amount of flocculant present in a mixture comprising a latex copolymer;
- mixing the effective amount of flocculant and the phosphoric acid, the mixing forming a flocculant-acid substance;
- and
- adding the flocculant-acid substance to the phosphoric acid production process.
A method of improving solids separation performance and minimizing the introduction of additional fresh water in a phosphoric acid production process, the method comprising the following steps:
- providing phosphoric acid;
- introducing an effective amount of flocculant directly into the phosphoric acid;
- mixing the effective amount of flocculant and the phosphoric acid, the mixing forming a flocculant-acid substance;
- and
- adding the flocculant-acid substance to the phosphoric acid production process;
- wherein
- the phosphoric acid is a clarified crude phosphoric acid, the clarified crude phosphoric acid recycled from the phosphoric acid production process;
- the flocculant is comprised of a substance selected from the group consisting of a homopolymer, a copolymer, a terpolymer, and any combination thereof;
- the flocculant comprising at least one monomer selected from the group consisting of:
- a vinyl containing functional monomer, a styrene containing functional monomer, an ethylene oxide containing functional monomer, and combinations thereof;
- the mixing step is achieved via inline blending;
- and
- the adding step is performed prior to at least one solids separation operation of the phosphoric acid production process.
Dependencies are inferred from the claim text.