STEELMAKING SLAG-COATED SEED AND METHOD FOR PRODUCING SAME
[Object] Provided is a steelmaking slag-coated seed and a method for producing the same, which can be produced with less time and effort of a worker and at lower cost, and yet can include a sufficient amount of a uniform coating layer based on steelmaking slag. [Solution] A steelmaking slag-coated seed includes a seed of a rice plant or the like and a steelmaking slag layer formed on an outside of the seed; the steelmaking slag layer is a covering layer made of steelmaking slag powder obtained by pulverizing steelmaking slag; the steelmaking slag contains a prescribed amount or more of calcium relative to all components of the steelmaking slag.
1 . A steelmaking slag-coated seed comprising:
a seed; and
a steelmaking slag layer formed on an outside of the seed,
wherein the steelmaking slag layer is a covering layer made of steelmaking slag powder obtained by pulverizing steelmaking slag, and
the steelmaking slag contains 10 mass % or more iron and 30 mass % or more calcium relative to all components of the steelmaking slag.
2 . The steelmaking slag-coated seed according to claim 1 ,
wherein the seed is a seed of a rice plant.
3 . The steelmaking slag-coated seed according to claim 1 ,
wherein the steelmaking slag contains 10 mass % to 30 mass % iron and 30 mass % to 50 mass % calcium relative to all the components of the steelmaking slag.
4 . A steelmaking slag-coated seed,
wherein a seed is covered with steelmaking slag powder containing 25 mass % or more and 50 mass % or less CaO and 8 mass % or more and 30 mass % or less SiO 2 .
5 . The steelmaking slag-coated seed according to claim 4 ,
wherein the steelmaking slag powder further contains 1 mass % or more and 20 mass % or less MgO, 1 mass % or more and 25 mass % or less Al 2 O 3 , 5 mass % or more and 35 mass % or less Fe, 1 mass % or more and 8 mass % or less Mn, and 0.1 mass % or more and 5 mass % or less P 2 O 5 .
6 . A steelmaking slag-coated seed,
wherein a seed is covered with one or both of dephosphorization slag and decarburization slag that are kinds of steelmaking slag powder.
7 . The steelmaking slag-coated seed according to claim 4 ,
wherein the steelmaking slag powder has a particle size of 600 μm or less.
8 . The steelmaking slag-coated seed according to claim 1 ,
wherein the steelmaking slag powder has a particle size of 600 μm or less, and contains powder with a particle size of 45 μm or less at 20% or more.
9 . The steelmaking slag-coated seed according to claim 4 ,
wherein the seed is covered with a mixture of the steelmaking slag powder and one or both of gypsum and iron powder.
10 . The steelmaking slag-coated seed according to claim 1 ,
wherein the seed is a seed covered with starch.
11 . The steelmaking slag-coated seed according to claim 1 ,
wherein a surface of the seed is further covered with gypsum.
12 . The steelmaking slag-coated seed according to claim 1 ,
wherein a covering portion of the seed further contains molasses.
13 . A method for producing a steelmaking slag-coated seed,
the steelmaking slag-coated seed including
a seed and
a steelmaking slag layer formed on a surface of the seed,
the method comprising:
a steelmaking slag pulverization process of pulverizing, as steelmaking slag serving as a material of the steelmaking slag layer, steelmaking slag containing 10 mass % or more iron and 30 mass % or more calcium relative to all components of the steelmaking slag into powder;
a seed soaking process of incorporating water into a seed before coating; and
a steelmaking slag coating process of mixing steelmaking slag powder obtained in the steelmaking slag pulverization process and a seed obtained in the seed soaking process and thereby forming a steelmaking slag layer made of the steelmaking slag powder on a surface of the seed.
14 . The method for producing a steelmaking slag-coated seed according to claim 13 ,
wherein the seed is a seed of a rice plant.
15 . The method for producing a steelmaking slag-coated seed according to claim 13 ,
wherein, in the steelmaking slag pulverization process, the steelmaking slag is pulverized into steelmaking slag powder with a particle size of 600 μm or less.
16 . The method for producing a steelmaking slag-coated seed according to claim 13 ,
wherein the steelmaking slag powder obtained in the steelmaking slag pulverization process contains powder with a particle size of 45 μm or less at 20% or more.
17 . A method for producing a steelmaking slag-coated seed comprising:
covering a seed with a mixture obtained by mixing steelmaking slag powder containing 25 mass % or more and 50 mass % or less CaO and 8 mass % or more and 30 mass % or less SiO 2 , and water; and
solidifying the mixture.
18 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein the steelmaking slag powder further contains 1 mass % or more and 20 mass % or less MgO, 1 mass % or more and 25 mass % or less Al 2 O 3 , 5 mass % or more and 35 mass % or less Fe, 1 mass % or more and 8 mass % or less Mn, and 0.1 mass % or more and 5 mass % or less P 2 O 5 .
19 . A method for producing a steelmaking slag-coated seed comprising:
covering a seed with a mixture obtained by mixing one or both of dephosphorization slag and decarburization slag that are kinds of steelmaking slag powder, and water; and
solidifying the mixture.
20 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein the seed is covered with a mixture obtained by mixing the steelmaking slag powder, water, and one or both of gypsum and iron powder, and the mixture is solidified.
21 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein the mass ratio of water in the mixture is 10 mass % or more and 80 mass % or less relative to the total mass of the mixture.
22 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein the water is water containing 10 mass % or more and 50 mass % or less molasses.
23 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein a seed soaked in a starch aqueous solution is used as the seed.
24 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein a surface of the solidified mixture is further covered with gypsum.
25 . The method for producing a steelmaking slag-coated seed according to claim 17 ,
wherein a surface of the solidified mixture is further wetted with water containing 0.5 mass % or more and 5 mass % or less sodium alginate, and then the solidified mixture is dried.