For a method for granulating molten material, in particular slags, in which the molten material is introduced into a granulating chamber in which water is held as a cooling liquid, wherein the molten material is preferably quenched and granulated with evaporation of the water, an acid is added to the water.

Disclosed is a slag comprising, on a dry basis and expressed as the total of the metal present as elemental metal and the presence of the metal in an oxidized state, a) at least 7% wt and at most 49% wt of Fe, b) at most 1.3% wt of Cu, c) at least 24% wt and at most 44% wt of SiO.sub.2, and d) at least 2.0% wt and at most 20% wt of CaO, characterised in that the slag comprises, on the same basis, e) at least 0.10% wt and at most 1.00% wt of Zn, f) at least 0.10% wt and at most 2.5% wt of MgO, and g) at most 0.100% wt of Pb. Further disclosed are an improved object comprising the slag, a process for the production of the slag, and a number of uses of the slag, whereby the slag may comprise up to at most 1.50% wt of zinc and down to 1.0% wt of CaO.

Disclosed is a slag comprising, on a dry basis and expressed as the total of the metal present as elemental metal and the presence of the metal in an oxidized state, a) at least 7% wt and at most 49% wt of Fe, b) at most 1.3% wt of Cu, c) at least 24% wt and at most 44% wt of SiO.sub.2, and d) at least 2.0% wt and at most 20% wt of CaO, characterised in that the slag comprises, on the same basis, e) at least 0.10% wt and at most 1.00% wt of Zn, f) at least 0.10% wt and at most 2.5% wt of MgO, and g) at most 0.100% wt of Pb. Further disclosed are an improved object comprising the slag, a process for the production of the slag, and a number of uses of the slag, whereby the slag may comprise up to at most 1.50% wt of zinc and down to 1.0% wt of CaO.

The purpose of the present invention is to provide a method for recovering calcium-containing solid components from steelmaking slag, with which it is possible to easily increase the calcium recovery rate. With the method, steelmaking slag is immersed in an aqueous solution containing carbon dioxide, and calcium in the steelmaking slag is made to leach out into the aqueous solution. Next, the immersed steelmaking slag is removed from the aqueous solution, and, subsequently, the pH of the aqueous solution is increased. When solid components precipitated by doing so are recovered, it is possible to recover solid components containing 20% or more by mass in terms of calcium atoms.

Method and plant for the stabilization and inertization of slag which is intended to obtain an inert and matured product based on slag deriving from steel production processes in steelworks or ferrous mineral treatment processes in blast furnaces.

Method and plant for the stabilization and inertization of slag which is intended to obtain an inert and matured product based on slag deriving from steel production processes in steelworks or ferrous mineral treatment processes in blast furnaces.

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 microwave heat treatment method for granulated blast furnace slag is provided, which includes the following steps: subjecting the granulated blast furnace slag to microwave heat treatment at a frequency of 900-930 MHz and then cooling the slag. Microwave rapid heating is utilized to remove the moisture in the granulated blast furnace slag, stress is generated inside the granulated blast furnace slag particles to promote the formation of cracks or the decomposition of the granulated slag particles into small particles. After the microwave reaches a certain power, the microwave is turned off, an air blower is turned on, and thermal stress is generated inside the granulated blast furnace slag particles, so that the particles are further promoted to generate cracks or fragmentation; and then the desired fine powder can be obtained by ball milling the granulated blast furnace slag after microwave heat treatment for a short time.

A microwave heat treatment method for granulated blast furnace slag is provided, which includes the following steps: subjecting the granulated blast furnace slag to microwave heat treatment at a frequency of 900-930 MHz and then cooling the slag. Microwave rapid heating is utilized to remove the moisture in the granulated blast furnace slag, stress is generated inside the granulated blast furnace slag particles to promote the formation of cracks or the decomposition of the granulated slag particles into small particles. After the microwave reaches a certain power, the microwave is turned off, an air blower is turned on, and thermal stress is generated inside the granulated blast furnace slag particles, so that the particles are further promoted to generate cracks or fragmentation; and then the desired fine powder can be obtained by ball milling the granulated blast furnace slag after microwave heat treatment for a short time.

Pig iron and spherical silica-based proppant are extracted and produced through the use of formers, fluxes, reductants, and stabilizers, at predetermined specified weight ratios. The base material utilized in this process is slag, typically derived from the mining industry. The slag is delivered and utilized in a manner that allows the adding and mixing of the various materials such as, but not limited to, carbon, calcium oxide, sodium oxide, aluminum oxide, magnesium oxide, and potassium oxide. The formulated mixture is then heated for a predetermined period of time, based upon weight to a liquid state, wherein the molten pig iron is separated from the molten silica glass. The molten pig iron is then poured into molds, and the molten silica glass is atomized into spherical proppant. The process is particularly well suited to slags produced from copper smelting, but can be extended to slags from other commodities and industries.