52results about "Cinker content reduction" patented technology

Cementitious compositions and methods for preparing and using the cementitious compositions to yield hardened concrete. The cementitious compositions yield hardened concrete having reduced or attenuated water vapor emission and lower internal relative humidity (IRH). Cementitious compositions are characterized by the property of rapid surface drying while maintaining good workability, particularly when using porous lightweight aggregates that absorb substantial amounts of water. Methods of decreasing water availability and increasing surface drying of concrete, including lightweight concrete, are provided. A water soluble ionic salt may be used to sequester water within the pores and capillaries of the cement paste and / or porous lightweight aggregate by modifying the colligative property of pore water. The salt may be added directly to concrete or the concrete mix water, or, alternatively, aggregates may be infused with a water-salt solution to provide treated porous aggregates having improved water saturation and water retention.

Construction castable material with controllable flow or slump comprising (a) a binder comprising fly ashes comprising from 1.5% to 35% by weight of CaO and a Lost on Ignition (LOI) value from 0.5% to 5.5% by weight, representing from 10% to 60% of the binder weight and ground granulated blast furnace slag comprising from 40% to 70% by weight of CaO and from 30 to 60% by weight of SiO2, representing from 40% to 90% of the binder weight, (b) an activator comprising alkaline reagents selected from the group composed by water glass, preferably in solution with 30 to 50% by weight solid content, sodium metasilicates and sodium hydroxide, (c) sand, fine and coarse aggregates and (d) organic acids or conjugated salts of organic acids in a dosage from 0.001% to 3% by weight with respect to the binder.

A method is provided of thermally processing carbonaceous ash and ancillary carbonaceous material to produce a carbon-free inert, pozzolanic, or cementitious material and synthesis gas. The carbonaceous ash and ancillary fuels are fed into a thermal reactor along with oxides provided in the ash or in additives including limestone or glass. Carbon in the ancillary fuel and coal fly ash is converted to synthesis gas that is combusted to generate process steam and electricity. Remaining ash exits the thermal reactor chamber for processing at high temperature in a kiln gasifier to react the remaining fixed carbon and produce carbon-free partially-fused nodules or clinker that are cooled and ground to a desired fineness for cementitious or aggregate material in concrete. Carbonaceous ash, especially high carbon coal fly ash and other carbonaceous waste, are converted to energy and non-toxic, carbon-free aggregate or cementitious material used as architectural fill or in concrete mixes.

The invention discloses a rapid-hardening high-belite calcium sulfoaluminate cement clinker and relates generally to a rapid-hardening high-belite calcium sulfoaluminate cement clinker and methods to use and to manufacture the clinker. The clinker of the present invention comprises 20% to 35% by weight of C4A3S 3% to 9% by weight of C4AF, 37% to 47% by weight of C2S, 0.5% to 4.6% by weight of f-CaO and 14% to 26.3% by weight of CaSO4. The chemical compositions of the clinker are 12.9% to 16.1% by weight of SiO2, 12% to 19% by weight of Al2O3, 1% to 3% by weight of Fe2O3, 49% to 54% by weight of CaO and 12% to 18.43% by weight of SO3. It is manufactured by calcining, at a temperature of 1300° C.±50° C. in a rotary kiln, the raw meal, comprising 33% to 62% by weight of limestone, 10.5% to 28% by weight of fly ash, and 19% to 45% by weight of FGD gypsum. A group of rapid-hardening high-strength cements of various strength classes can be manufactured by mixing and grinding 26% to 97% by weight of clinker, 3% to 19% by weight of anhydrite and 0% to 55% by weight of granulated blast furnace slag.

The invention provides a superfine regeneration powder compound geopolymer cementing material. The superfine regeneration powder compound geopolymer cementing material is prepared from raw materials comprising superfine waste brick regeneration powder, superfine slag powder, desulfurization gypsum, sodium metasilicate and potassium hydroxide according to a weight ratio of (40-70):(30-60):(2-8):(1-4):(1-4). The invention also provides a novel application of building rubbish regeneration powder. According to the novel application, the building rubbish regeneration powder is at least used together with an active excitation agent and prepared into a compound geopolymer cementing material. According to the superfine regeneration powder compound geopolymer cementing material, no portland cement clinker is used or few portland cement clinkers are used; and the superfine regeneration powder compound geopolymer cementing material is capable of making full use of solid waste and building rubbish and greatly improving use value of the building rubbish, is free of burning process, green and environment-friendly and is capable of providing a novel method for recycling the building rubbish.

Cementitious compositions and processes for preparing and using the cementitious compositions are provided. The cementitious compositions are characterized by the property of a reduced or an attenuated water vapor emission from a cementitious mix and a concrete formed therefrom. Certain cementitious compositions are characterized by the property of accelerated drying while still maintaining good workability. Methods of improving water retention and surface drying of concrete, including lightweight concrete are provided. A water soluble ionic salt may be used to sequester water within the pores and capillaries of the cement paste and / or porous lightweight aggregate. In some examples, the salt may be added directly to concrete or aggregates may be infused with a water-salt solution to provide treated porous aggregates having improved water saturation and water retention.

The invention relates to an ecotypic cementing material, which comprises the components of: 40-60 parts of building waste brick powder, 15-30 parts of slag, 10-20 parts of steel plant semi-dry sintering flue gas desulfurization ash, and 10-15 parts of a composite grinding aid activator, which is prepared by raw materials in the following weight ratio: 70-85 parts of calcination modified desulfurization gypsum, 5-10 parts of sodium metasilicate pentahydrate, 5-10 parts of sodium aluminate, 1-5 parts of a naphthalene-based water reducer, 0.1-0.5 part of triethanolamine, 0.05-0.1 part of potassium humate, and 0.05-0.1 part of glycerol. The cementing material of the invention utilizes the synergetic and complementary effects of component materials, realizes resource utilization of building waste brick powder and semi-dry desulphurization ash as well as other solid wastes, thus making waste profitable.

The invention discloses a method for treating arsenic-containing waste residues by using a cement rotary kiln, belonging to the field of solid waste and hazardous waste treatment and disposal technologies. The method comprises the steps of (1) mixing the arsenic-containing waste residues with a cement raw material to obtain a raw material for preparing a cement clinker, wherein the arsenic-containing waste residues account for 0.6-4.0% of the weight of the raw material; and (2) putting the raw material obtained by mixing in the step (1) into the cement rotary kiln to prepare an arsenic-containing cement clinker. The method disclosed by the invention has the advantages that the arsenic-containing waste residues are treated through the existing dry method cement rotary kiln to facilitate harmless and resource utilization of the arsenic-containing waste residues, potential environmental pollution risks and secondary pollution during harmless treatment of the arsenic-containing waste residues are effectively controlled, and the environmental benefit and economic benefit are obvious.

Provided is sludge treatment facility that can spray contaminated water evenly in water-containing sludge that has been deposited in a sludge hopper. This sludge treatment facility (1) is provided with a contaminated water recovery mechanism (4) which comprises: a contaminated water recovery tank (3) for recovering contaminated water (6) resulting from cleaning either a sludge hopper (2) that stores water-containing sludge (5) transported from a sewage treatment plant by truck (8) or pipes in the sludge treatment facility (1); and a contaminated water return pipe (7) that transports the water from the contaminated water recovery tank (3) to the sludge hopper (2). The water-containing sludge (5) that is stored in the sludge hopper (2) is treated by a cement manufacturing process (13). A water spraying unit (7a) on the sludge hopper (2) side of the contaminated water return pipe (7) is disposed above the dropping position for the water-containing sludge (5) into the sludge hopper (2) from the truck (8) such that the contaminated water (6) is sprayed onto the peak (5a) of the water-containing sludge (5) that has collected within the sludge hopper (2).

The invention relates to a preparation method of 52.5-grade slag portland cement by taking industrial solid wastes as a raw material, and belongs to the fields of solid waste comprehensive utilization and building materials. The invention discloses a preparation method of the 52.5-grade slag portland cement by superfine slag micro-powder with the specific surface area of not less than 600 m<2> / kgand high-grade semi-hydrated desulfurized gypsum. During preparation, the proportions of the superfine slag micro-powder and the high-grade semi-hydrated desulfurized gypsum are not less than 30% by mass, the proportion of the Portland cement (P.II) is not more than 70%, and the content of SO3 in the prepared 52.5-grade slag portland cement is not more than 4.0%. The preparation process adopts a mixing method of a machinery and airflow. The 52.5-grade slag portland cement, provided by the invention, has low hydration heat, so that the service life of the concrete is prolonged; in comparison with the other slag cement, the cement has remarkable early strength advantage, the compressive strength (MPa) is not less than 28 in 3 days, and the compressive strength is not less than 55 in 28 days, the rupture strength (MPa) is not less than 6 in 3 days, and the rupture strength is not less than 8 in 28 days. According to the invention, the slag is doped in a large amount, and zero emission ofthe slag is realized.

A binder material useful for forming a concrete type material includes, calculated on a dry, water and carbon dioxide free basis, a base component constituting 50-95 wt % of the binder material, the base component having ground granulated blast furnace slag and an activator component constituting 5-50 wt % of the binder material. The activator component includes aluminum sulfate and a sodium hydroxide generating compound. The final binder material includes, calculated on a dry, water and carbon dioxide free basis, ground granulated blast-furnace slag 35-95 wt %, aluminum sulfate AI2(SO4)3 1-25 wt %, and sodium hydroxide generating compound 4-35 wt %.