Abstract: Disclosed is a method producing a high protein content rapeseed meal from a rapeseed meal in a simply manner and at low cost, and producing no or less waste. Specifically disclosed is a method for producing a rapeseed meal, which comprises applying a rapeseed meal to a 32 to 60 mesh sieve to separate the rapeseed meal into a coarse rapeseed meal having such a grain size that grains of the meal remain on the 32 to 60 mesh sieve and a fine rapeseed meal having such a grain size that grains of the meal pass through the 32 to 60 mesh sieve.

Abstract: A method of solidifying a steel-making slag is performed by subjecting a mixture of a steel-making slag containing at least about 50% by weight of a powdery steel-making slag having a particle size not greater than about 5 mm and a substance containing at least about 30% by weight of SiO2 (e.g., a fly ash and/or the fine powder of a granulated blast furnace slag) to a hydration reaction. The resulting solidified material contains at least about 20% of a tobermorite phase, has high strength and is suitable as an inorganic material useful as a roadbed material, building and civil engineering materials, etc.