31 results about "Monocalcium aluminate" patented technology

The present invention in particular relates to an aluminate cement and a method for preparing the same. The invention adopts the following technical proposal: according to patent technology (ZL200510019664.3) of a method for preparing titanium and titanium alloy through utilization of titaniferous slag, after the titanium and titanium alloy are extracted by the patent method, the slag in a molten state is added with bauxite or industrial alumina of 5 to 40 weight percent of the slag, is melted, is subjected to cold quenching or slow cooling and is broken and pulverized till the specific surface area is more than 3,000cm<2> / g, thereby preparing the aluminate cement. The chemical compositions of a produced product mainly comprise CaO, Al2O3, MgO and little SiO2; and the main crystal phases of the product are monocalcium aluminate (CA), dicalcium aluminate (CA2) and magnalium spinel (MgAl2O4) and sometimes contain little C12A7 and C2AS (gehlenite). The aluminate cement and the method can effectively utilize titanium resource of the slag, realize high added value utilization of the slag, realize harmless treatment of the titaniferous blast furnace slag and have better industrialized prospect.

The invention belongs to the technical field of new materials and discloses elastic concrete. The elastic concrete comprises the following raw materials in parts by weight: 30-40 parts of cement, 10-20 parts of slag powder, 40-80 parts of rubber particles, 1-3 parts of a composite fiber, 0.01-0.05 part of polyoxyethylene sorbitan monostearate, 30-60 parts of emulsified asphalt, 10-30 parts of water-borne epoxy resin, 0.5-2 parts of a polycarboxylate superplasticizer, 0.01-0.05 part of a defoamer, 1-2 parts of calcium metaaluminate, 3-8 parts of modified zeolite powder, 50-60 parts of sand and10-30 parts of water. The elastic concrete is compounded by inorganic materials, is low in price, high in elasticity, good in flexibility and excellent in anti-freezing property, can be used for outdoor works, can effectively absorb an impact force brought by exercise, improves the degree of comfort during exercise and reduces injuries of the impact force on a body; and as the rubber particles arelow in heat conductivity coefficient and high in flexibility, an outdoor sport field can be prevented from free-thaw damages, and the service life of the field is prolonged.

The invention discloses high temperature-resistant oil well cement, underground high temperature-resistant oil well cement paste and a well cementation process method. The high temperature-resistant oil well cement comprises 65 to 95 weight parts of monocalcium aluminate and 5 to 35 weight parts of dicalcium silicate which are used as main components and citric acid. The underground high temperature-resistant oil well cement paste comprises 50 to 56 weight parts of 50 to 56 weight parts of high temperature-resistant oil well cement, 44 to 50 weight parts of clear water, and 0.5 to 1.5 weight parts of retarder citric acid. The thickening time of the underground high temperature-resistant oil well cement paste is controlled to be 2 to 9 hours by the retarder citric acid. When the underground high temperature-resistant oil well cement paste is used for well cementation, a well can resist 800 DEG C and more than 60 MPa, and elastic modulus is less than 10 GPa; and the underground high temperature-resistant oil well cement paste can be applied to thickened oil thermal wells, extradeep wells, very deep wells and geothermal wells.

The invention relates to a method for preparing high-purity monocalcium aluminate by a solid-phase reaction. The monocalcium aluminate (CaO.Al2O3, CA) is prepared by the following steps: sufficiently and uniformly mixing 1 part of aluminum oxide (Al2O3) powder and 0.8-1 part of calcium carbonate (CaCO3) powder both by mass in an agate mortar in a closed environment; performing sufficient heat treatment with a platinum / rhodium crucible at 1000-1200 DEG C; heating to 1200-1400 DEG C and preserving heat for 4-6 hours; closing the heating furnace and slowly cooling to room temperature; grinding the mixture into fine-particle powder in the agate mortar in a closed environment; heating to 1200-1400 DEG C and preserving heat for 4-6 hours; closing the heating furnace and slowly cooling to room temperature; and levigating the powder in the agate mortar in a closed environment to obtain monocalcium aluminate. In the invention, the preparation technology is simple, the tabletting and granulating of raw materials are not needed, the reaction raw materials are nontoxic, and the product purity is very high.

The invention discloses a cement early-strength admixture which contains 34-58% of anhydrous calcium sulphoaluminate and 42-66% of monocalcium aluminate. The cement early-strength admixture is free of organic matters. The preparation method comprises the following steps: uniformly mixing calcic waste, bauxite and desulfurized gypsum, adding water (the water-to-cement ratio is 0.3-0.42), grinding for 4-7 hours, pouring the slurry into a mold, forming, and demolding to obtain a sample; and carrying out isothermal curing on the sample at 65-95 DEG C for 15-24 hours, cooling, crushing, calcining at 800-1000 DEG C for 60-120 minutes, taking out, quenching, and milling to obtain the cement early-strength admixture. The early-strength admixture prepared by the method provided by the invention has the advantages of early strength and setting acceleration, and does not need to add any organic matter which is harmful to the human body.

The invention discloses a magnesia expansion agent and a method prepared by using high-calcium magnesite tailings. The magnesia expansion agent of the present invention uses high-calcium magnesite tailings as the main raw material, and uses aluminum hydroxide as the adjusting material. It was prepared by calcination at 1050°C. The present invention utilizes the Al produced by the decomposition of aluminum hydroxide 2 O 3 Absorb the f-CaO produced by the decomposition of high-calcium magnesite tailings to form the cementitious substances monocalcium aluminate and dodecalumina heptaaluminate, which significantly reduces the production of magnesite expansion agent from high-calcium magnesite tailings. The content of f-CaO solves the social problem of high-calcium magnesite tailings causing pollution to the ecological environment, expands the direction for the high value-added application of high-calcium magnesite tailings, and reduces the use of magnesite expansion agents. The production cost provides market competitiveness for the promotion and application of magnesium expansion agent in water conservancy and hydropower projects, and has significant social and economic benefits.

The invention provides a C-containing 7 A 5 M mineral magnesium aluminate cement material, the weight percentage of magnesium pentaaluminate heptacalcium mineral in the cement clinker is 40~60%, and the magnesium pentaaluminate heptacalcium is 7CaO.5Al 2 o 3 .MgO. Cement clinker also contains monocalcium aluminate and magnesium aluminate. C containing in the present invention 7 A 5 The aluminate cement material of M mineral has outstanding early strength and rapid hardening performance, low firing temperature, good hydration performance, and energy saving. The compressive strength of cement mortar: 30~50MPa for 3d, 60~80Mpa for 28d, the strength of cement in the middle and late stages has been significantly improved to make up for the strength loss caused by drying shrinkage.

The invention relates to a ceramic filter for a continuous casting tundish and a method for preparing the same. The technical scheme is that 50-70wt% of calcium carbonate particles, 2-15wt% of corundum particles and 2-10wt% of magnesia-alumina spinel particles serve as aggregate; 1-5wt% of prefused dodecacalcium hepta-aluminate particles, 10-15wt% of fine monocalcium aluminate powder and 4-10wt% of fine calcium dialuminate powder and 4-6wt% of prefused fine dodecacalcium hepta-aluminate powder serve as substrates; and silicone resin that accounts for 2-7wt% of the sum of the aggregate and the substrates serves as a binding agent. The binding agent and the aggregate are mixed and ground evenly, and the substrates are added to be mixed and ground for 3-7 min to obtain a mixture; vibrating pressure forming is performed, demolding is performed, and the mixture undergoes heat preservation for 6-36 h at 180-320 DEG C to obtain the ceramic filter for the continuous casting tundish. The ceramic filter for the continuous casting tundish has the advantages of wide impurity-removing particle size range, high efficiency, insusceptibility to blockage, high strength, washing resistance and long service life.

The invention relates to a regenerative coagulant, and a preparation method and a using method thereof. The regenerative coagulant is characterized in that: the regenerative coagulant is prepared from waste concrete serving as a raw material. The preparation method comprises the following specific steps of: collecting the waste concrete, rejecting sands, crushing and grinding the waste concrete, sieving the ground concrete by using a 150-mesh sieve, calcinating the sieved concrete for 2h, cooling the calcinated concrete and levigating the cooled concrete to obtain the regenerative coagulant in form of powder with the particle sizes of less than 0.03mm and the specific surface area of 3,000 to 4,000 cm<2> / g. The regenerative coagulant and the preparation method ensure a good coagulation effect by fully utilizing the hydration of artificial minerals such as monocalcium aluminate, dicalcium phosphate, tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite and the like, the electrical neutralization, absorption and enmeshment effects of hydrolyzate and the synergism of coagulation and precipitation; and in the using method, coagulant regeneration is realized by utilizing the high precipitation performance of coagulation sludge and adopting filtration, drying and calculation flows to recycle the coagulant for many times.

The invention relates to the technical field of concrete, in particular to concrete antifreezer.The concrete antifreezer is prepared from 15-25 parts of sodium oxide, 8-12 parts of aluminum potassium sulfate, 3-6 parts of triisopropanolamine, 10-12 parts of sodium lignosulphonate, 6-8 parts of sodium carbonate, 12-18 parts of monocalcium aluminate, 3-9 parts of sodium carboxymethylcellulose, 3-5 parts of paraffin, 1-4 parts of pimacol, 2-6 parts of cerous nitrate, 10-15 parts of tea saponin, 12-18 parts of melamine, 1.8-3.8 parts of SAF-I type superplasticizer, 0.8-2.4 parts of sulphonated acetone-formaldehyde resin, 1.2-3.8 parts of modified bentonite, 0.1-0.6 part of air entraining agent and 1.8-4.8 parts of antifoaming agent.The novel antifreezing components are adopted, the alkali content is greatly reduced, concrete alkali aggregate reaction can be avoided, and the antifreezer does not precipitate or crystallize when stored at the subzero temperature; the novel components do not contain ammonia and do not pollute the environment.

The invention discloses a preparation method of a concrete material containing active additives. The preparation method comprises: mixing allophane, potassium carbonate powder and hydrochloric acid solution, and performing the first heat treatment and the second heat treatment in sequence , to obtain material A after grinding; mix tartaric acid, maleic acid, ammonium formate, calcium metaaluminate, oxalic acid, sodium tartrate and calcium chloride, and obtain material B after drying, sieving, roasting and grinding; Sodium silicate, sodium citrate, zinc formate, calcium carbonate, potassium carbonate, sodium acetate trihydrate, calcium formate, calcium metaaluminate and calcium chloride are mixed, and material C is obtained after drying, sieving, roasting and grinding; After mixing material A, material B and material C, the active additive is obtained through roasting and secondary tempering treatment; the concrete material is obtained by mixing portland cement, active additive, sodium silicate, quartz sand and water. It solves the problem of insufficient overall mechanical strength and impermeability of traditional concrete materials.

The present invention relates to an early strength agent composition, which comprises the following materials, by weight, 15-40 parts of a soluble organic calcium compound, 5-25 parts of calcium metaaluminate (Ca(AlO2)2), 25-55 parts of a metal chloride, and 10-28 parts of an alkali metal carbonate (M2CO3), wherein M is an alkali metal. The present invention further relates to a preparation method for the early strength agent composition, a cement composition containing the early strength agent composition. The present invention further relates to uses of the compositions in cementing application.