A process for preparing solid slag granules from a molten slag composition comprises: (a) providing the molten slag composition; (b) converting the molten slag composition into the solid slag granules in a dispersion apparatus; and (c) sorting the solid slag granules by shape in a separator to produce a plurality of fractions having different sphericities. Granular slag products comprise one or more fractions of solid slag granules produced by the process, and include proppants, roofing granules, catalyst supports, which may be porous or non-porous, and coated or uncoated.

Some methods for making a granular material comprise crushing demetallized slag particles with one or more crushers and screening the crushed demetallized slag particles with one or more screens to separate the demetallized slag particles into two or more fractions, the granular material comprising at least one of the fractions of the demetallized slag particles. Prior to the crushing, ones of the demetallized slag particles having a size that is less than or equal to 2 inches can account for at least 90% of the demetallized slag particles. An iron-compound content of the demetallized slag particles, by weight, can be less than or equal to 10%. Crushing and screening can be performed such that ones of the demetallized slag particles of the granular material having a size that is less than or equal to 1.25 mm account for at least 90% of the demetallized slag particles of the granular material.

A method and system for recovering a high yield of low carbon ferroalloy, e.g., low carbon ferrochrome, from chromite and low carbon ferrochrome produced by the method. A stoichiometric mixture of feed materials including scrap aluminum granules, lime, silica sand, and chromite ore are provided into a plasma arc furnace. The scrap aluminum granules are produced from used aluminum beverage containers. The feed materials are heated, whereupon the aluminum in the aluminum granules produces an exothermic reaction reducing the chromium oxide and iron oxide in the chromite to produce molten low carbon ferrochrome with molten slag floating thereon. The molten low carbon ferrochrome is extracted, solidified and granulated into granules of low carbon ferrochrome. The molten slag is extracted, solidified and granulated into granules of slag.

Disclosed are a hydraulic binder composition using rapidly-cooled steelmaking reduced slag powder and a method of preparing the same. More particularly, the rapidly-cooled steelmaking reduced slag (RC-LFS) powder is obtained by spraying and scattering gas at a high pressure and high speed onto electric furnace smelting reduction slag, which is one of the by-products generated during iron smelting performed in an ironworks, and quickly cooling and pulverizing the slag. The initial high hydration heat reaction and initial setting of the rapidly-cooled steelmaking reduced slag (RC-LFS) powder are delayed to ensure workability. A retardant and gypsum are mixed into the rapidly-cooled steelmaking reduced slag (RC-LFS) powder so as to activate the generation of needle-shaped ettringite and to thus develop the initial and long-term strength, and therefore the rapidly-cooled steelmaking reduced slag (RC-LFS) powder of the present invention can be used as a substitute for ordinary Portland cement.

Disclosed are a hydraulic binder composition using rapidly-cooled steelmaking reduced slag powder and a method of preparing the same. More particularly, the rapidly-cooled steelmaking reduced slag (RC-LFS) powder is obtained by spraying and scattering gas at a high pressure and high speed onto electric furnace smelting reduction slag, which is one of the by-products generated during iron smelting performed in an ironworks, and quickly cooling and pulverizing the slag. The initial high hydration heat reaction and initial setting of the rapidly-cooled steelmaking reduced slag (RC-LFS) powder are delayed to ensure workability. A retardant and gypsum are mixed into the rapidly-cooled steelmaking reduced slag (RC-LFS) powder so as to activate the generation of needle-shaped ettringite and to thus develop the initial and long-term strength, and therefore the rapidly-cooled steelmaking reduced slag (RC-LFS) powder of the present invention can be used as a substitute for ordinary Portland cement.

The present invention relates to a method for obtaining calcium aluminates for metallurgical use from non-saline aluminum slags by means of reactive grinding and thermal treatment.

A rotary atomizer for receiving molten material and projecting droplets of the molten material there from; the rotary atomizer having a rotating well for receiving molten material. The well comprising a base and a peripheral wall extending from a peripheral rim around the base, the top of the peripheral wall having an inner top edge and a lip region extending away from the inner top edge at an angle of 0-60 degrees below the horizontal. Preferably the upper region of the peripheral side wall extending to the inner top edge is substantially vertical.

A rotary atomizer for receiving molten material and projecting droplets of the molten material there from; the rotary atomizer having a rotating well for receiving molten material. The well comprising a base and a peripheral wall extending from a peripheral rim around the base, the top of the peripheral wall having an inner top edge and a lip region extending away from the inner top edge at an angle of 0-60 degrees below the horizontal. Preferably the upper region of the peripheral side wall extending to the inner top edge is substantially vertical.

[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.

[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.