| abstract |
It is easy and low cost to supply various kinds of elements as fertilizer of plants without the loss of water by acidity even in areas with high rainfall or floods in rivers. The steelmaking slag for raw material for fertilizer according to the present invention contains P 2 O 5 : 2 to 8%, MnO 3 to 10%, boron: 0.005 to less than 0.05%, steel: 15% CaO: 29% or more and less than 38%, SiO 2 : 16% or more and less than 22%, Sulfur: 0.1% or more and 0.6% or less, MgO: 4% or more and 8% or less, Al 2 O 3 : containing% or less, and wherein the P 2 O 5 soluble ratio of P 2 O 5 of 50% or more, and the proportion of the MnO obtain soluble MnO of 80% or more, represented by (CaO content / SiO 2 content) The slag basicity is more than 1.5 but not more than 2.2, and the bulk specific gravity is not less than 2.3 and not more than 3.2. |