A method for preparing Portland cement includes: respectively weighing iron slag, copper slag, vanadium slag, and nickel slag and grinding, to yield prefabricated iron slag, prefabricated copper slag, prefabricated vanadium slag, and prefabricated nickel slag; weighing mica and kaolinite, mixing, and grinding to obtain aluminous raw materials; evenly mixing the prefabricated iron slag and the aluminous raw materials, and calcining, to yield an iron-aluminum eutectic mineral; weighing the marble, fluorite, dolomite, and quartz, evenly mixing the marble, fluorite, dolomite, and quartz with the prefabricated copper slag, prefabricated vanadium slag, and prefabricated nickel slag to yield a first mixture; grinding the iron-aluminum eutectic mineral to yield powders, and calcining a second mixture of the first mixture and the powders, to yield the cement clinker; and cooling the cement clinker, and grinding a third mixture of the cooled cement clinker and the gypsum, to yield the Portland cement.

The invention is related to a construction building material mixture that is generally used in the construction sector, which is highly waterproof, dustproof, resistant to chipping, shrinking, cracking and whose tensile strength has been increased, and which is efficient and cost efficient. The cost of the mixture is lower and it is more efficient as said construction building material mixture is formed of granule or micron particles of natural gypsum and/or natural hemihydrate gypsum and/or natural anhydrite material.

The invention is related to a construction building material mixture that is generally used in the construction sector, which is highly waterproof, dustproof, resistant to chipping, shrinking, cracking and whose tensile strength has been increased, and which is efficient and cost efficient. The cost of the mixture is lower and it is more efficient as said construction building material mixture is formed of granule or micron particles of natural gypsum and/or natural hemihydrate gypsum and/or natural anhydrite material.

Embodiments relate to use of Limestone Rock Aggregate (LRA) as a component used to manufacture clinker, wherein the clinker is used in the manufacture of Portland cement. LRA is a naturally occurring limestone deposit that has been impregnated with various bituminous and hydrocarbon components, including asphaltenes and lighter hydrocarbons. Because of the presence of hydrocarbon components, LRA is energy positive making it easier (e.g., requiring less energy) to kiln heat than pure, or common, limestone. As will be explained herein, the LRA can be treated before being used as a component cement manufacture. The treatment of the LRA can involve removal, or extraction, of certain bituminous material (e.g., light hydrocarbons from the LRA). This extracted bituminous material can be used in other material processes (e.g., crude oil refining). The treatment of LRA can also involve manipulating the gradation of crushed LRA material to improve its minerology for cement production.

Embodiments relate to use of Limestone Rock Aggregate (LRA) as a component used to manufacture clinker, wherein the clinker is used in the manufacture of Portland cement. LRA is a naturally occurring limestone deposit that has been impregnated with various bituminous and hydrocarbon components, including asphaltenes and lighter hydrocarbons. Because of the presence of hydrocarbon components, LRA is energy positive making it easier (e.g., requiring less energy) to kiln heat than pure, or common, limestone. As will be explained herein, the LRA can be treated before being used as a component cement manufacture. The treatment of the LRA can involve removal, or extraction, of certain bituminous material (e.g., light hydrocarbons from the LRA). This extracted bituminous material can be used in other material processes (e.g., crude oil refining). The treatment of LRA can also involve manipulating the gradation of crushed LRA material to improve its minerology for cement production.

The present invention relates to a binder composition comprising Portland cement clinker, calcium sulfate, an inorganic sulfate source having a solubility higher than 100 g/l at 20 C. polyalcohol and/or metal salts thereof, a carbonate selected of the group consisting of organic carbonate, alkali carbonate, and mixtures thereof, a component F), and dispersant having a charge density of more than 0.80 eq/g.

The present invention relates to a binder composition comprising Portland cement clinker, calcium sulfate, an inorganic sulfate source having a solubility higher than 100 g/l at 20 C. polyalcohol and/or metal salts thereof, a carbonate selected of the group consisting of organic carbonate, alkali carbonate, and mixtures thereof, a component F), and dispersant having a charge density of more than 0.80 eq/g.

DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calcined gypsum in the slurry are provided as well.

DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calcined gypsum in the slurry are provided as well.

Aspects of the invention include a method of producing a cement material comprising step of: first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt; second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt; wherein the second acid is different from the first acid and the second calcium salt is different from the first calcium salt; and thermally treating the second calcium salt to produce a first cement material. Preferably, but not necessarily, during the second reacting step, reaction between the first calcium salt and the second acid regenerates the first acid.