38 results about "Alite" patented technology

An Alinty-barium calcium thioaluminate cement contains barium calcium thioaluminate (3-38 wt.%), tricalcium aluminate (3-20), tricalcium silicate (30-60), dicalcium silicate (15-40), and ferroaluminate (3-20). Its advantages are low burning temp, high early strength and hardening speed, and low cost.

The present invention relates to a coagulating / flocculating method for processing nanofiltration concentrate reject stream of early percolate at refuse landfills, which belongs to the technical field of environment protection. The present invention uses reasonable coagulating / flocculating agent kinds, coagulating / flocculating agent dosage, pH-value processing time and stirring time to adjust the pH-valve range of the nanofiltration concentrate reject stream to 7.5 to 10. Polymerization aluminum salt, polymerization alite, or composite salt is used as coagulating / flocculating agent. The feeding amount of the coagulating / flocculating agent is 50 to 1000 mg / L accounted by Al2O3. The coagulating / flocculating agent is stirred rapidly first at 100 to 280 r / min for 0.5 to 5 min; then, the coagulating / flocculating agent is stirred slowly at 20 to 100 r / min for 3 to 30 min; and solid-liquid separation is done. By the processing of the coagulating / flocculating method, the nanofiltration concentrate reject stream of early percolate can be discharged within controlling index of national standard.

The invention relates to an alite crystal modulation process in a metasilicate cement clinker. The alite crystal is changed in the clinker through carrying out thermal treatment on the metasilicate cement clinker so as to achieve the purpose of improving the performance of the metasilicate cement clinker. Therefore, the process is simple and feasible.

The invention discloses a method for regulating and controlling an alite crystal structure in cement clinker. Th method comprises the following steps: simultaneously introducing a magnesium element and a sulfur element in the preparation process of a Portland cement raw material, and completely converting M3-type alite in the clinker into M1-type alite under the combined action of the magnesium element and the sulfur element. The raw materials used in the crystal structure regulation and control method are easy to obtain, and the method is simple, easy to operate and high in universality. In actual production, desulfurized gypsum, phosphogypsum and the like can be used as sulfur sources, so that the comprehensive utilization value of industrial by-products is increased. The magnesium source can be selected from low-quality limestone, no additional ingredient components need to be added, the operation is convenient, the use of the low-quality limestone is increased, and the production cost is reduced. After being regulated and controlled by the method, the alite crystal structure in the Portland cement clinker can be completely converted from M3 type or M1 / M3 mixed type into M1 type.

The invention discloses a method for preparing Alite-barium calcium sulphoaluminate cement from red mud. The method comprises the following steps: (1) adopting a mineral phase of Alite-barium calcium sulphoaluminate cement prepared from red mud, wherein the mineral phase consists of the following components in percentage by mass: 5%-8% of C3.75B0.25A3S, 15%-19% of C2S, 40%-60% of C3S, 10%-20% of C4AF and 4%-8% of C3A; (2) according to the mineral phase composition of Alite-barium calcium sulphoaluminate cement, calculating the mixing amount of the following raw materials in percentage by mass: 6%-10% of red mud, 0.3%-0.5% of barium mud, 65%-75% of lime stone, 0.3%-1% of bauxite, 15%-25% of clay, 3%-5% of gypsum and 0.4%-1.5% of fluorite, wherein the fluorite is taken as a mineralizer; (3) crushing, homogenizing, drying, grinding, uniformly mixing, roasting and cooling the raw materials; and (4) adding and grinding gypsum or dihydration gypsum powder which accounts for 5-12% of the total mass until the specific surface area is 350-450m<2> / kg. The method disclosed by the invention is low in sintering temperature, high in early strength, stable in later strength and low in cost, can be used for providing an effective utilization way for comprehensively utilizing the red mud.

The present invention provides a dental composition comprising cement and a nonaqueous liquid, wherein the cement comprises: a first domain comprising alite; a second domain comprising belite; and a matrix located between domains of at least one type selected from the group consisting of the first domain and the second domain, and comprising silicon (Si) atom-doped tricalcium aluminate (3CaO.Al2O3). A dental hydraulic composition according to the present invention is an ointment-type composition having a single composition, and is convenient to use and exhibits an aesthetic impression, high curing property, and high biocompatibility.

The invention relates to high-strength silicate cement clinker and a preparation method thereof. The mineral constituents of the clinker are as follows in percentage by weight: alite (50%-75% of tricalcium silicate C3S), belite (2%-25% of dicalcium silicate C2S), tricalcium aluminate (2%-10% of C3A), tetra calcium aluminoferrite (2%-8% of C4AF), calcium sulphoaluminate (2%-9% of C4A3S), free calcium oxide (0.5%-3% of f-CaO), periclase (1%-6% of f-MgO) and bassanite (0-3% of CS). 1-day stand mortar strength, 3-day stand mortar strength and 28-day standard mortar strength are respectively 25MPa-35MPa, 38MPa-45MPa and 65MPa-75MPa; the clinker has certain expansibility after being hydrated; and the hydrated sample volume porosity is 10%-12%. The preparation method of the clinker comprises the following steps of: introducing gypsum to raw materials; improving content of SO3 in the materials to form calcium sulphoaluminate; properly improving aluminum ratio in dosing to control liquid phase amount in the clinker, and reducing the content of iron in the clinker; and sintering the materials into clinker under 1400 DEG C to 1500 DEG C, cooling and thermally treating the cooled clinker, quenching after the treatment is finished, wherein the clinker with high alite content is mainly formed in the first sintering process, and the secondary formation of calcium sulphoaluminate is promoted by the thermal treatment.

The present invention relates to a process of controlling crystal form of Alite in Portland cement clinker, wherein the said Portland cement clinker is thermally treated in order to change the crystal form of Alite in Portland cement clinker, so as to improve performance of resulting Portland cement clinker. The said process of present invention is easy and feasible.

A cement clinker which necessitates no considerable change in the main chemical components and mineral components of cement, is free from preheater coating problems and adverse influences on cement properties, and is effective in reducing the heat quantity required for burning; and a process for producing the cement clinker. In the process for cement clinker production a substance having a melting point higher than the temperature of a liquid phase of the cement clinker and serving as crystal nuclei for C3S is incorporated include a fine powder of refractory brick, particles of an ordinary Portland cement clinker, a fine powder of a high-early-strength Portland cement clinker, a high-early-strength Portland cement, and a fine powder of quicklime. Due to this, alite generation is accelerated even at a low temperature. As a result, high-quality clinker can be produced through burning using a small unit heat quantity and no decrease in cement quality results. The process contributes to a reduction in preheater coating amount and prolongation of the life of the refractory bricks.

The invention discloses calcium sulphoaluminate-Relit composite mineral phase cement and preparing method, which is characterized by the following: adopting coal ash, alumina, limestone and plaster as raw material and fluorite as mineralizer; designing MG and MS value; introducing new Relit mineral in the preparing course of common aluminium sulfate cement; preparing new clinker of new calcium sulphoaluminate-Relit composite mineral phase cement under 1200-1330 deg.c with 45%-65% C4A3S, 20%-36% C3S and residual C2S.

The present application discloses a method for controlling the Alite crystal form in Portland cement clinker by gas-solid reaction. The Portland cement clinker is crushed to obtain Portland cement clinker particle material, and then 2 In a mixed gas atmosphere with air, raise the temperature to 600-1100°C, keep it warm for 0.5-2 hours, and cool to room temperature after the reaction. The present invention passes through SO in the process of high temperature heat preservation 2 Mixed gas with air, using SO in the mixed gas 2 It can interact with cement clinker minerals to increase the content of M1 Alite, thereby improving the performance of Portland cement clinker. This method can consume a certain amount of SO compared with the control process of Alite crystal form in traditional Portland cement clinker. 2 gas, for cement and others may produce SO 2 The waste gas company provides a feasible solution, and the Alite crystal form regulated by gas-solid reaction has a higher conversion rate of M1 Alite.

The invention discloses a portland cement clinker and a preparation method thereof, wherein the M1 type alite accounts for more than 99% of the mass of all alite crystal forms; the clinker contains trace amounts of magnesium and sulfur, wherein the mass of magnesium is The content of sulfur is 0.5%~5% in terms of MgO; the mass percentage of sulfur is in terms of SO 3 Calculated as 0.36% to 2.94%. From the perspective of ion regulation, the present invention introduces magnesium and sulfur elements simultaneously during the preparation of Portland cement raw materials, and through the joint action of magnesium and sulfur elements, the M3 type alite in the clinker is completely converted into M1 Type Alite, so as to stably burn Portland cement clinker with high M1 Alite content, which not only reduces the clinker firing temperature, reduces the consumption of fossil fuels, but also reduces the emission of greenhouse gases, reaching The multiple effects of energy saving, emission reduction, consumption reduction, and quality improvement have extremely high application value.

An Alinty-barium calcium thioaluminate cement contains barium calcium thioaluminate (3-38 wt.%), tricalcium aluminate (3-20), tricalcium silicate (30-60), dicalcium silicate (15-40), and ferroaluminate (3-20). Its advantages are low burning temp, high early strength and hardening speed, and low cost.