Title: Compositions for use in agriculture as soil modifiers and their method of manufacture

Abstract: Compositions useful in agriculture as soil modifiers and fertilizers are prepared by contacting the waste materials, obtained in the manufacture of titanium dioxide from ilmenites by the sulphate process, and which consist essentially of ferrous sulphate, with oxides, hydroxides or carbonates of alkali metals or alkaline earth metals or ammonium carbonate, and then submitting the reaction product to oxidation to convert the ferrous hydroxide into ferric hydroxide. Ferric hydroxide is further converted to ferric sulphate by treatment with sulphuric acid.

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Inventors: Piccolo, Luigi (Milan, IT)
Calcagno, Benedetto (Milan, IT)
Ghirga, Marcello (Bresso (Milan), IT)
Paolinelli, Antonio (Milan, IT)

Application Number: 509609
Filing Date: 1974-09-26
Publication_date: 1976-02-03
Assignee: Societa' Italiana Resine S.p.A. (Milan, IT)
Primary Class(es): 71/63 71/64.13, 71/903, 423/548, 423/632
Other Classes:
US Patent Ref:

824791	Jul, 1903	Jenkner et al.	71/25.
1294526	Feb, 1919	Vis	423/548.
2529874	Nov, 1950	Hoak	423/632.
2741876	Apr, 1956	Paolini	71/63.
2795495	Jun, 1957	Schmatloch et al.	71/63.
2798802	Jul, 1957	Roy et al.	423/548.
2845332	Jul, 1958	Allison et al.	423/548.

Other Refs:
Primary Examiner: Spear, Jr., Frank A.
Assistant Examiner: Lander, Ferris H.
Attorney: Sughrue, Rothwell, Mion, Zinn & Macpeak