Title:
STEELMAKING SLAG FOR USE AS FERTILIZER STARTING MATERIAL, METHOD FOR PRODUCING STEELMAKING SLAG FOR USE AS FERTILIZER STARTING MATERIAL, METHOD FOR PRODUCING FERTILIZER, AND FERTILIZATION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/004339
Kind Code:
A1
Abstract:
[Problem] To easily and inexpensively supply multiple types of elements as plant fertilizer while avoiding runoff caused by flowing water, even in acidic soils in regions which receive a lot of rainfall and regions where rivers often flood. [Solution] This steelmaking slag for use as a fertilizer starting material contains, in mass%, P2O5 in the amount or 2-8%, inclusive, MnO in the amount of 3-10%, inclusive, boron in the amount of at least 0.005% and less than 0.05%, total iron in the amount of at least 7% and less than 15%, CaO in the amount of 38-48%, inclusive, SiO2 in the amount of 22-30%, inclusive, sulfur in the amount of 0.1-0.6%, inclusive, MgO in the amount of 1-8%, inclusive, and Al2O3 in the amount of 0.5-3%, inclusive. The proportion of soluble P2O5 in the P2O5 is at least 50%, the proportion of soluble MnO in the MnO is at least 80%, the slag basicity is greater than 1.5 and no greater than 2.2, and the bulk specific gravity is 1.9-2.8, inclusive.
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Inventors:
ITO KIMIO (JP)
Application Number:
PCT/JP2018/024529
Publication Date:
January 03, 2019
Filing Date:
June 28, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C05D3/04; C05D9/02; C21C1/02; C21C5/28
Foreign References:
| JPS4741825B1 | 1972-10-23 | |||
| JPS5738388A | 1982-03-03 | |||
| JP5881286B2 | 2016-03-09 | |||
| JPS5468713A | 1979-06-02 | |||
| JP2012041229A | 2012-03-01 | |||
| CN101701281A | 2010-05-05 |
Other References:
GAO, XU ET AL.: "Application of Fertilizer Made of Steelmaking Slag in the Recovery of Paddy Fields Damaged by the Tsunami of 2011", ISIJ INTERNATIONAL, vol. 56, no. 6, 2016, pages 1103 - 1110, XP055569383
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
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