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Sposób otrzymywania kwasu fosforowego z zastosowaniem ozonu do procesu ekstrakcji

100%

Trefler B.

tom Nr 2

31-35

Przedstawiono wyniki badań laboratoryjnych i przemysłowych nowego sposobu wytwarzania kwasu fosforowego metodą dwuwodzianową z zastosowaniem ozonu do procesu ekstrakcji fosforytów. Wykazano, że zastosowanie ozonu poprawia reaktywność surowców fosforowych, obniża pienienie pulpy reakcyjnej, polepsza właściwości produkowanego kwasu fosforowego oraz, w przypadku gdy surowcem jest fosforyt Tunezja, zmniejsza uciążliwość produkcji kwasu dla otoczenia, w wyniku zmniejszenia, o ponad 70%, emisji substancji odorot-wórczych.

Results of the laboratory and industrial investigations on a novel process for the manufacture of phosphoric acid by dihydrate method using ozone in the digestion stage are presented. It is found that the presence of ozone increases the reactivity of phosphatic raw materials, decreases foaming the reaction pulp, improves properties of phosphoric acid produced and - in the case of Tunis phosphate rock - reduces odours matters emission (being bundersome for the environment and resulting from acid production) by over 70%.

The waste free method of utilizing asbestos and the products containing asbestos

51%

Trefler B. , Pawełczyk A. , Nowak M.

Polish Journal of Chemical Technology

2004

tom Vol. 6, nr 4

60-63

The paper presents the problems related to the use of asbestos and the asbestos containing materials as well as the methods of the neutralization of the waste asbestos developed after enforcing the limitations and bans on this material. A new method elaborated by the authors consists in the digestion of the asbestos wastes in a strongly acidic environment of the phosphoric acid with such a concentration of hydrogen ions that it assures maintaining all the originating phosphates in the soluble form. Thus, all phosphates, mainly calcium and magnesium ones, can easily be separated from the solid residue and processed to other products. After the neutralization with calcium hydroxide or calcium carbonate the solution can be processed to fodder phosphates (MCP or DCP type) or to phosphate fertilizers - triple superphosphate (TSP) or to dicalcium phosphate. The chemical analyses as well as the microscopic observations carried out, showed that no asbestos fibers were present in the liquid as well as in the solid products obtained in the laboratory scale tests.

Utilization of waste from semi-dry flue gas desulfurization

51%

Trefler B. , Pisarska B. , Wójcik D.

Polish Journal of Chemical Technology

2002

tom Vol. 4, nr 1

21-23

A study into the oxidation of sulfites contained in a waste product obtained from semi-dry flue gas desulfurization process has been performed. Ozone enriched air or oxygen and weak hydrogen peroxide solution used as oxidizing agents were found favourable for this purpose. The waste treated in such a way can be utilized in agriculture as soil lime. In contrast to ozone, hydrogen peroxide proved to be more efficient, cost-effective and more favourable under the equipment aspect. From technological and economical point of view, it seems most advantageous to carry out the sulfite oxidation operation using atomized hydrogen peroxide solution introduced directly into the bulk waste during the desulfurization process.