Environmental aspects of feed phosphates production

Hoffmann, J.; Borowiec, M.; Huculak, M.

doi:10.2478/v10026-009-0005-2

Cited by 3 publications

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“…Considering a concept of a new feed phosphate production facility it was deemed necessary to carry out studies of the processes and unit operations involved [5][6][7][8] . Phosphoric acid produced for fertilizer purposes, containing at least 54% by wt.…”

Section: Introductionmentioning

confidence: 99%

New Low-Temperature Technology of Producing Calcium Feed Phosphate with Microelements

Hoffmann¹

2007

American J. of Agricultural and Biological Sciences

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he possibility of producing feed calcium phosphates in a way ensuring a low physical water content in the product was investigated in laboratory conditions. For this purpose the process use of a phosphoric acid solution with a higher (than in conventional methods) P₂O₅ content (53-63% by wt. P₂O₅) with CaO (molar fraction of 0.5-0.8) and CaCO₃ in the phosphoric acid neutralizing mixture was tested. Phosphates with a high content of phosphorous forms highly assimilable by animals, soluble in 0.4% HCl (94-99%), were obtained. The physical water content of 1-4% by wt. H₂O was obtained when a phosphoric acid solution with a 59% by wt. P₂O₅ content and a CaO molar fraction of 0.8 in the neutralizing mixture were used and for a phosphoric acid solution with a 63 % by wt. P₂O₅ content. A temperature above 160°C was obtained when respectively phosphoric acid with a 59% by wt. P₂O₅ content and the highest CaO fraction in the neutralizing mixture and a phosphoric acid solution with a 63% by wt. P₂O₅ content were used. An elevated CO₂ content in the products, indicating an increase in the unreacted calcium carbonate content, was found when a phosphoric acid solution containing 59% by wt. P₂O₅ and a CaO fraction of 0.8 in the neutralizing mixture were used and also for a phosphoric acid solution with a 63% by wt. P₂O₅ content and a CaO fraction of 0.7-0.8 in the neutralizing mixture. By supplementing extraction phosphorous acid composition with microelements (Se, Cu and Zn compounds) at the stage of extraction phosphoric acid production one can obtain a product with a homogenous content of the elements, but this entails losses as high as 70-80% caused by the separation of phosphogypsum from the phosphorous material decomposition product. Because of the different mass fractions of microelement salts and feed phosphates a homogenous selenium compound content in feed phosphate is obtained only after 8 hours of mixing. Mixing time is twice shorter for copper and zinc

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Section: Introductionmentioning

confidence: 99%

New Low-Temperature Technology of Producing Calcium Feed Phosphate with Microelements

Hoffmann¹

2007

American J. of Agricultural and Biological Sciences

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Comparative LCA study of different methods of the feed phosphates (FPs) production

Smol

Kowalski

Makara

et al. 2019

Journal of Cleaner Production

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Investigation of applying calcium oxide for the removal of bitter substances from hop wastes

Hoffmann

Huculak-Mączka

Skut

2011

Polish Journal of Chemical Technology

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Utilization of brewery wastes is one of the solutions for the production of the fodder supplements containing biogenic nutrients. The condition of such application is to meet the requirements included in the regulations regarding animal feeding, particularly removing a bitter taste. The aim of the performed investigations was the removal of bitter acids from the post-extraction hop waste using the calcium oxide addition. For the examination hop wastes obtained as a by-product from the CO 2 plant extraction in supercritical conditions, were applied. Physicochemical properties of the waste samples collected for the investigations were determined by applying the available standard analytical techniques. The analyses of the determination of bitter acids were carried out by the high performance liquid chromatography method. During the experiments very good effects of bitter acids removal from hop wastes, were obtained by using CaO suspensions in water. The investigations on the influence of the CaO concentration in suspension on the efficiency of bitter acids removal indicate the possibility of applying suspensions by 2 wt% for this purpose.

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Environmental aspects of feed phosphates production

Cited by 3 publications

References 1 publication

New Low-Temperature Technology of Producing Calcium Feed Phosphate with Microelements

New Low-Temperature Technology of Producing Calcium Feed Phosphate with Microelements

Comparative LCA study of different methods of the feed phosphates (FPs) production

Investigation of applying calcium oxide for the removal of bitter substances from hop wastes

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