Abstract: A method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant. The method includes calcining the limestone block, to obtain quicklime; cooling the quicklime at ambient temperature, drying and pulverizing the quicklime, to obtain a first powder essentially consisting of a quicklime powder and a calcium carbonate powder; fully drying and grinding a nonmetallic mineral, to obtain a nonmetallic mineral powder; mixing the first powder and the nonmetallic mineral powder, stirring to be uniform, to obtain a mixture, and ball milling the mixture, to obtain a nano-powder; adding a dust-absorbing material to the nano-powder, adding water and mixing, and pouring the resulting mixture into a mold, and stoving; and air drying the resulting mixture, to obtain a cavernous dust-reducing and dust-absorbing material.

Abstract: A hydraulic binder based on slag cement, the slag cement including 20 to 80 weight % relative to a total weight of slag cement, of a blast furnace slag or a mixture of blast furnace slags, relative to the total weight of the slag cement, the hydraulic binder including an acceleration additive that is a ternary system including at least one alkali metal hydroxide in an amount such that, during mixing with water of the hydraulic binder, a molar concentration of the alkali metal hydroxide in the water is from 0.05N to 0.60N, preferably from 0.20N to 0.40N; an alkali metal sulfate at a rate of from 0.2 to 3 weight % of the slag cement; and a source of calcium sulfate in such a proportion that the content of calcium sulfate (CaSO4), relative to the weight of the slag cement, is from 2 to 7%.

Abstract: A cement product is disclosed. The cement product includes clinker defined by a feedstock material and a ladle metallurgical facility slag material derived from a ladle metallurgical facility steel production system. A system and method for manufacturing clinker is also disclosed.

Abstract: A method for the production of cement clinker comprises the introduction of vitrified slag into the feedstock stream prior to the clinkering zone. The addition of vitrified slag can increase the clinker output rates and/or reduce the energy requirements for maintaining the kiln temperatures. In one embodiment, the vitrified slag is a vitrified blast furnace slag.

Abstract: A process for the production of Portland cement and white Portland cement using magnesium furnace slag, a waste product from the manufacture of magnesium metal, as a primary starting material. The furnace slag is blended with calcium oxide and silicon dioxide to form a feedstock which is heated to a temperature and for an amount of time sufficient to form clinker. The clinker is cooled, ground to a powder, and blended the clinker with powdered gypsum to form the Portland cement. White Portland cement may be produced by removing iron containing compounds from the slag, minimizing contamination of the material by iron compounds throughout the process, and cooling the clinker in a manner that minimizes oxidation of any remaining iron compounds in the clinker.

Abstract: A method and apparatus for production of cement clinker uses fragmented metallurgical slag, such as from blast furnace production of iron or steel, introduced into a rotary kiln at an infeed located between the kiln front feed end and the rear outlet end. The metallurgical slag combines with predominantly limestone feedstock material flowing inwardly from the feed end toward a burner pipe at the outlet end and intimately blends with the limestone material to become transformed into cement clinker as the blended materials progress through the kiln. Preferably, the metallurgical slag is introduced into the kiln through a kiln dust infeed apparatus present in many rotary kilns at a mid location.

Abstract: A method is provided for manufacturing cement from a raw material mixture which includes finely ground steel slag. Selected quantities of steel slag and other raw materials are mixed with each other and supplied to a raw mill. The steel slag and other raw materials are preferably ground to a fine, dry powder. For some applications, the dry powder is preferably supplied to a blend tank for further mixing to ensure more uniform commingling of the finely ground steel slag with other finely ground raw materials. The fine dry powder may be supplied to a preheat system and then to the feed end of a kiln. Alternatively, the dry powder may be supplied directly to the feed end of a kiln.

Abstract: The present invention discloses a process for producing both steam power and the fast-burnt cement clinker/fast burnt modified coal ash simultaneously in one apparatus, the fast-burnt cement clinker/fast-burnt modified coal ash prepared by said process as well as cement products prepared using them as active substance. It also discloses the apparatus suitable for embodying this process. Said process of the present invention possesses the technoligical features of fast-burning and fast-cooling and contributes a good hydraulic cementitious activity to the said fast-burnt cement clinker/fast-burnt modified coal ash which are capable of being directly used as active substance in cement production of high quality.

Abstract: A method of making cement from base metal smelter slag produced by nickel, copper, lead or zinc smelter, includes grinding the slag with clinker and blast furnace slag to a size in the range of from about -250 to about 425 mesh to produce ground slag cement, and mixing the ground slag cement with Portland cement in a ratio of at least about 0.5:1 by weight to produce a blended cement.

Abstract: Undried blast furnace slag, for example, granulated blast furnace slag having a water content of 3 to 20, generally 5 to 15%, by weight, is introduced to hot clinker in a cooler downstream of a cement kiln; the water is volatilized or evaporated in the cooler to provide a cement clinker having an effective content of dried blast furnace slag free of water; this permits use of blast furnace slag in a blended cement without the need for separate special steps for drying the slag.

Abstract: A method for producing cement is disclosed. The method has the advantages that a setting time can be shortened as compared with conventional cement, and a manganese slag can be treated at low cost without giving load to environment, by using the manganese slag which has conventionally been subjected to waste disposal, as a cement raw material. The method comprises using, as a part of cement materials, a manganese slag which is an insoluble component formed in extraction step and refining step in a production of electrolytic manganese dioxide comprising extracting a manganese component from manganese-containing ore, refining a manganese-containing aqueous solution obtained, and conducting electrolytic treatment, to produce manganese dioxide.

Abstract: A Portland cement clinker free of C.sub.4 A.sub.3 S having the following proportions of clinker phases, in % by wt.:--C.sub.3 S: 40 to 80--C.sub.4 AF: <20--C.sub.2 S: <30--C.sub.3 A: <20and a SO.sub.3 content from 1.0 to 3.0% by wt., based on the clinker, obtained by burning a mixture of raw materials containing CaO, SiO.sub.2, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3 and an additive containing SO.sub.3 at temperatures from 1200.degree. to 1350.degree. C. centigrade, the use thereof and a Portland cement.

Abstract: A process and apparatus by which blast-furnace slag can be added to the feedstock materials fed into the feed-end of a rotary cement kiln to form cement clinkers. The blast-furnace slag is crushed and screened to provide blast-furnace slag particles having particles with a predominant size of up to a maximum diameter of substantially 2" or less.

Abstract: A process and apparatus by which steel slag can be added to the feedstock materials fed into the feed-end of a rotary cement kiln to form cement clinkers. The steel slag is crushed and screened to provide steel slag particles having a maximum diameter of 2".

Abstract: The invention relates to a method for preparing a hydraulically settable cement base material starting from steel slags formed in a steel-making process, which method comprises the formation, in steel slags in the liquid state, of a ferrite gradient by adding a ferrite-precipitating compound, the separation, if required, of the high-ferrite fraction formed, the separation of at least the low-ferrite fraction formed, the cooling and the comminution thereof to obtain a hydraulically settable material. The ferrite-precipitating compound used has preferably acid components, and can expediently generate silicic acid. At least before the cooling of the low-ferrite fraction, the aluminum content of the liquid slag material is regulated by the addition of an aluminate-containing material, such as bauxite. The high-ferrite fraction separated can be returned to the steel-making process to reduce or remove the addition of a flux in the production of steel.

Abstract: An iron making blast furnace revert briquette composition including finishing mill scale, steelmaking slag, blast furnace dust and a binder wherein the binder includes Portland cement, granulated blast furnace slag cement or mixtures thereof and bentonite. The bentonite improves the cold and hot strength of the briquette.

Abstract: The invention relates to a cement composition which can be hardened hydraulically and which consists of ground cement clinker material, granulated blast furnace slags and comminuted steel slags. The comminution of the steel slags is preferably carried out by grinding, in particular to a particle size of at most 0.2 mm and expediently to 0.09 mm. The ground steel slags have a Blaine value of at least 400 m.sup.2 /kg, expediently 473 m.sup.2 /kg, and a weight per unit volume of 2,800-4,000 kg/m.sup.3. The steel slags are chosen from air-cooled steel slags, foamed steel slags, granulated steel slags or a combination thereof. A method is also described for the preparation of a cement composition which can be hardened hydraulically, in which method cement clinker material and ground, granulated blast furnace slags are mixed with ground steel slags at normal or elevated temperature and pressure, the obtained mixture is cooled if desired, and comminuted to obtain a hydraulically hardenable cement composition.

Abstract: A flux composition for cement comprises mainly wollastonite. One of the compositions of the flux is wollastonite 99%, fluorite 5-15% and gypsum 30-35%. The flux is added during the preparation of the cement raw materials and comprises 1-10% of the admixture. Thus, the firing temperature firing time may be shortened, the consumption of coal may be decreased and manufacturing productivity of the cement may be improved. In addition, the compression strength and the binding strength of the cement are also improved.

Abstract: Initial granulated blast furnace or phosphatic slag is subjected to heat treatment at a temperature of 1000.degree.-1200.degree. C. in oxidizing gas atmosphere to produce an active mineral additive for binding materials.

Abstract: Active mineral additive to binding materials, consisting of granulated phosphatic slag 94-98% by mass and sulphate containing component 2-6% by mass, which is a mixture of sodium sulphate 47.2-57.6% by mass, magnesium sulphate 40.5-51.1% by mass and sodium rhodonite 1.7-1.9% by mass.