27 results about "Calcium nitrite" patented technology

The invention discloses a preparation process and application of a cement chromium removal mineral admixture, and the process comprises the following steps: (1) leaching siliceous phosphate tailing powder in an acid solution, carrying out solid-liquid separation to obtain a solid product and a leaching solution, washing the solid product, uniformly mixing with a dihydric phosphate solution, and drying to obtain active siliceous phosphate tailing powder; and (2) calcining coal gangue powder in a protective atmosphere to carbonize organic matters in the coal gangue powder, mixing a calcined product with the leaching solution, adding alkali for neutralization, drying, and performing thermal decomposition to obtain pretreated coal gangue powder. And (3) uniformly mixing the pretreated coal gangue powder with a calcium nitrite solution, drying or performing vacuum drying in a protective atmosphere, and uniformly mixing the obtained powder with the active siliceous phosphate tailing powder to obtain the cement chromium removal mineral admixture. The admixture disclosed by the invention not only can be used as an auxiliary cementing material to replace part of cement clinker and promote the utilization of solid wastes, but also can reduce the content of water-soluble chromium (VI) in the cement clinker.

The invention discloses a composite thermal insulation material suitable for A-grade fire prevention and a preparation method thereof, relates to the technical field of building composite materials, and solves the problem that an existing building material is difficult to meet the comprehensive requirements of fire prevention, thermal insulation and freezing resistance in alpine regions. Comprising quick-hardening sulphoaluminate cement, silica powder, MDI-50, polyether polyol, silane coupling agent modified basalt fibers, silane coupling agent modified polyvinyl alcohol fibers, triethanolamine, a thickening foam stabilizer, fatty alcohol ether sodium sulfate and 1-1.5 parts of a calcium nitrite antifreezing agent. The thickening foam stabilizer is a compound of hydroxypropyl methyl cellulose and polyether modified silicone oil. The material can be prepared without special construction equipment, can be accurately adapted to construction scenes of traffic inconvenience and energy shortage in alpine regions, and has extremely high engineering application value and popularization prospect.

A high-strength Portland cement slurry for ultra-high-temperature cementing, a preparation method therefor and an application thereof. In parts by weight, the composition of the cement slurry comprises: 100 parts of Portland cement, 4-6 parts of a high temperature anti-cracking material, 80-105 parts of a high-temperature reinforcing material, 70-78 parts of water, 0.5-1.5 parts of a dispersant, 1-3 parts of a fluid loss reducer, 0.5-2.5 parts of a retarder and 0.2-0.5 parts of a defoamer; the high-temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin and aluminum sulfate, a combination of acid-washed quartz sand, metakaolin, feldspar and sodium sulfate, or a combination of acid-washed quartz sand, metakaolin, feldspar and calcium nitrite. The cement slurry has good settling stability, rapid strength development in low temperatures, high compressive strength of cement stone at a high temperature of 600° C., and stable development of long-term high-temperature compressive strength.

The invention relates to the technical field of road engineering construction, and particularly discloses a ceramic tile adhesive as well as a preparation method and application thereof. The ceramic tile binder comprises sulphoaluminate cement, gypsum, aggregate, rubber powder, a polymer emulsion, an inorganic additive, a waterproof agent, a water reducing agent, a defoaming agent and an air entraining agent, wherein the inorganic additive comprises palygorskite powder, microcrystalline glass powder, calcium formate and calcium nitrite; the polymer emulsion comprises a water-based acrylate emulsion and an ethylene-vinyl acetate copolymer emulsion. The ceramic tile binder has good water resistance, excellent bonding performance and low temperature resistance, the problems that an existing ceramic tile binder is poor in water resistance, low in bonding strength and poor in low temperature resistance are effectively solved, and a new design thought is provided for design of the ceramic tile binder.

The invention discloses anti-corrosion marine concrete and a preparation method thereof, and relates to the technical field of marine concrete. Comprising the following raw materials in parts by weight: 270 to 290 parts of low-alkali ordinary Portland cement, 130 to 150 parts of slag powder, 110 to 130 parts of fly ash, 50 to 70 parts of high-density silica fume, 1100 to 1200 parts of aggregate, 110 to 125 parts of copper-plated microfilament steel fiber, 16 to 20 parts of ion shielding type silane grafted modified emulsion, 3 to 6 parts of melamine-formaldehyde resin coated calcium nitrite microcapsule, 0.05 to 0.1 part of modified cellulose ether and 6 to 8 parts of polycarboxylic acid high-performance water reducing agent. The water-binder ratio of the anticorrosive marine concrete is controlled to be 0.26-0.30. By constructing an organic and inorganic chemical bonding system and rheology regulation and control, uniform dispersion and stable film formation of the emulsion are realized, the interface bonding force is improved, the gradient vibration process is matched, the distribution of functional components is locked, layering and damage are avoided, and the concrete is endowed with excellent mechanical properties and self-repairing capability.

The invention belongs to the technical field of concrete, and particularly relates to low-thermal-conductivity floatable concrete and a preparation method thereof.The low-thermal-conductivity floatable concrete is prepared from, by mass, 524-625 parts of cement; 115 to 157.2 parts of fly ash; 7.9 to 12.5 parts of an additive; 37.9 to 107.4 parts of an aggregate; 6-8 parts of organic fiber; 10.5 to 12.5 parts of a water reducing agent; and 278.8 to 306.4 parts of water. And 43.8 to 52.4 parts of a PLGA coated SiO2 microcapsule carrying a corrosion inhibitor. According to the PLGA coated SiO2 microcapsule, on the basis of PLGA microspheres, a structure that SiO2 wraps PLGA is formed through emulsification, and the corrosion inhibitor adopts an analytically pure calcium nitrite reagent. The performance of a slurry microstructure is improved, toughness is given to a cement-based material, and the tensile adhesive strength and compressive strength of the cement-based material are improved. And meanwhile, the lightweight performance is guaranteed, and the impermeability and corrosion resistance are improved.

The invention discloses a wet-spraying protective coating for tunnels and underground engineering, a preparation method and a construction method. The coating is prepared from 40%-55% of ordinary Portland cement, 0.3%-2% of sulphoaluminate cement, 10%-15% of silica fume (SiO is larger than or equal to 92%), 12%-16% of acrylic latex powder, 2%-5% of hydrophobic modified nano-silica, 12%-20% of graded quartz sand, 0.1%-0.5% of antistatic fiber, 1%-2.5% of polycarboxylate superplasticizer, 0.8%-1.5% of calcium nitrite, 0.2%-0.5% of HPMC and 0.05%-0.3% of bentonite. The total percentage of the components is 100%. The preparation method comprises the steps of raw material pretreatment, staged mixing and vacuum packaging, and a three-stage mixing process is adopted to ensure uniform dispersion of fibers. During construction, water is added for stirring on site, and the material has high toughness, excellent impermeability and good bonding strength and is an environment-friendly system; the method is suitable for durability protection of concrete structures such as tunnels and underground engineering.

To provide a simple method for manufacturing precast concrete that does not require steam curing. [Solution] A method for producing precast concrete, characterized by using a cement composition comprising rapid-strength Portland cement, an expansive agent, and calcium nitrite, and demolding during normal curing at an accumulated temperature in the range of 150 to 300°C·hr. Herein, the cement composition contains 6 to 14 parts by mass of expansive agent and 0.3 to 1.5 parts by mass of calcium nitrite per 100 parts by mass of rapid-strength Portland cement.

This invention belongs to the field of concrete technology, specifically disclosing an anti-corrosion coating material for concrete pipelines. It is made from the following raw materials in weight percentages: water 22.5%~23.0%, calcium nitrite 0.5%~1.5%, and silicate cement 75.0%~77.5%. This invention also discloses a method for preparing the anti-corrosion coating material for concrete pipelines, including the following steps: (1) weighing each raw material according to the weight ratio; (2) mixing the dry calcium nitrite and silicate cement evenly; (3) slowly pouring in the aqueous solution and stirring slowly, then stirring rapidly for 1 minute after even mixing to obtain the pipeline anti-corrosion coating material. This invention has economic and environmental advantages, and the coating also possesses outstanding anti-corrosion performance, solving the problem of concrete durability degradation caused by internal chemical corrosion and microbial corrosion in municipal sewage pipelines, and effectively extending the service life of pipelines.

The invention relates to the technical field of concrete preparation, in particular to an anti-freezing concrete-filled steel tube and a preparation method thereof.The anti-freezing concrete-filled steel tube is prepared from, by weight, 650-670 parts of cement, 540-560 parts of machine-made sand, 540-560 parts of air-quenched aggregate, 3.8-4.12 parts of super absorbent resin, 3.0-3.2 parts of a water reducing agent, 10-15 parts of a composite anti-freezing agent, 1-2 parts of an air entraining agent and 290-304 parts of water; the composite antifreeze agent is composed of fumed silica, modified silica fume and calcium nitrite. According to the invention, the composite antifreeze agent, the super absorbent resin, the air entraining agent, the water reducing agent and the air-quenched aggregate are synergistically matched to construct a multi-scale and multi-mechanism antifreeze protection system, so that the problem of freeze-thaw damage when the concrete filled steel tube is applied in a cold region is effectively solved.

The application discloses high-strength concrete suitable for a winter negative temperature environment and a preparation method thereof, and relates to the technical field of building materials. The concrete comprises aluminate cement, silica ash, granulated blast furnace slag powder, a crystal nucleus type early strength agent, anti-freezing and toughening microcapsules, nano calcium carbonate, calcium formate, aluminum sulfate, calcium nitrite, triethanolamine, a water reducing agent, an air entraining agent, aggregates and water. The crystal nucleus type early strength agent is nano amorphous hydrated calcium silicate loaded with calcium formate and triethanolamine, and the anti-freezing and toughening microcapsules are coated with polyvinyl alcohol as a wall material and mixed core material of calcium nitrite, triethanolamine and polyethylene glycol 400. The application realizes the synergistic optimization of crystal nucleus induced nucleation, stress response release of anti-freezing components and pore structure, so that the concrete has rapid strength development, high frost resistance and long-term stability under a negative temperature of-15 DEG C.

The invention discloses a grouting material for rapid repair of a coal mine tunnel and a preparation process of the grouting material. The grouting material comprises a material A, a material B and water, the material A comprises sulphoaluminate cement clinker, metakaolin, a retarder and a defoaming agent; the material B comprises anhydrite, slaked lime, an alkaline activator, a defoaming agent, calcium nitrite, a rheological agent and a water reducing agent, and the technical problems that a traditional CSA material is insufficient in early strength, poor in fluidity and reduced in later strength are solved by doping the modified admixture and the mineral admixture.

The invention discloses an anti-freezing and anti-salt-corrosion protective coating material for a prefabricated part in a high-cold and high-salt environment and a preparation method thereof. Comprising the following raw materials in parts by weight: 50-100 parts of epoxy resin, 15-30 parts of a curing agent, 3-5 parts of a silane coupling agent, 3-8 parts of an anti-freezing agent, 3-8 parts of an anticorrosive agent, 1-3 parts of a dispersing agent and 1-3 parts of a toughening agent. The protective coating material prepared by the invention is suitable for prefabricated parts in high-cold and high-salt environments, and has high mechanical properties and anti-freezing and anti-salt corrosion properties. The combined use of ES216 epoxy resin and bisphenol A epoxy resin improves the mechanical properties of the material, the combined use of calcium magnesium acetate and dicyclohexylcarbodiimide improves the freezing resistance of the material, and the combined use of zinc dihydrogen phosphate and calcium nitrite improves the corrosion resistance of the material.

This invention discloses a low-heat disturbance grout suitable for construction in frozen soil and its preparation method. By weight, the raw materials include: 20-30 parts sulfoaluminate cement, 35-40 parts granulated blast furnace slag powder, 20-22.5 parts metakaolin, 15-17.5 parts alkali activator with slow-release effect, 290-310 parts fine aggregate, 30-35 parts water, 3-4 parts calcium nitrite, 0.4-0.6 parts water-reducing agent, and 0.02-0.04 parts triethanolamine. This invention significantly reduces the heat release during hydration while ensuring strength development, solving the problem of rapid, large, and concentrated heat release during cement hydration in frozen soil environments, which causes thermal disturbance to the frozen soil.

A construction product in the form of an internal lining board is formed from a mixture comprising: a binder, a bio-aggregate, an accelerator and a retarder. The ratio by weight of the accelerator to the binder is 1:10000 to 5:100. Planar lining material, such as paper, is provided on one or both outer faces of the mixture. The binder may comprise an alkaline earth-based binding agent, such as hydrated lime, and a cementitious material, wherein the cementitious material may comprise blast furnace slag, alkali activated binders, white cement, natural cement, calcium aluminate cement, and / or Portland cement. The accelerator can comprise calcium chloride, calcium nitrate, calcium nitrite, calcium formate, potassium aluminate, sodium silicate, sodium carbonate, sodium bicarbonate, sodium aluminate, diethanolamine, and / or aluminium sulfate. The retarder can comprise a sugar, phosphoric acid, a phosphate, boric acid, a borate, a lignosulfonate and / or citric acid. The mixture may further comprise cellulose. The bio-aggregate may be pyrolysed and can comprise a crop by-product. A method of manufacturing a construction product is also described.

The utility model relates to a kind of outdoor anti-corrosion anti-freezing anti-solar manure anaerobic fermentation red mud film methane tank, including pool wall body, the pool wall body is embedded in stratum, the pool wall body is formed by concrete adding silicon powder and calcium nitrite mixed solidification, epoxy resin coating is fixedly arranged in the lower end of the pool wall body inside, the epoxy resin coating is arranged in the pool wall body inside arc, drainage hole is set in the both sides of the pool wall body and is close to its lower end, the both sides of the pool wall body and located corresponding drainage hole place are fixedly set with through pipe, support is fixedly arranged in the pool wall body inside.The utility model in the present application, the methane tank is arranged in arc epoxy resin coating, drainage hole and support can make rainwater to be discharged smoothly, protect red mud fermentation bag from soaking in accumulated water in use process, and can be reserved expansion joint for red mud fermentation bag, adapt to expansion and shrinkage of temperature change and prevent accumulation of snow.

The invention relates to positive electrode slurry, a preparation method, a positive electrode plate and a battery. The positive electrode slurry comprises an active substance, a conductive agent, a metal compound additive and a binder, and the metal compound additive comprises bismuth hydroxide and calcium nitrite. According to the positive electrode slurry, the performance of the zinc-nickel battery is remarkably optimized through the synergistic effect of bismuth hydroxide and calcium nitrite. Gas produced in the battery is greatly reduced, the problems of gas expansion and liquid spraying of the battery are solved, the conductivity is obviously improved, the anode current is uniformly distributed, active substances are efficiently utilized, and the cycle stability is improved.

A blended particulate composition includes:a blended supplementary cementitious material (SCM) formed by intergrinding:an SCM selected from the group consisting of calcined clay, metakaolin, fly ash, bottom ash, shale dust, metallurgical slags, waste glass, and combinations thereof; anda non-lime-bearing material selected from the group consisting of limestone that has not been calcined to form calcium oxide (CaO), fine aggregate, sand, basalt, sinters, ceramics, recycled bricks, recycled concrete, and refractory materials; andat least one of a calcium-based cement or calcium-based set accelerator. The calcium-based cement may include Portland cement and the calcium-based set accelerator may include calcium oxide (CaO), calcium chloride (CaCl2), calcium nitrite (Ca(NO2)2, or calcium nitrate (Ca(NO3)2.

The invention discloses a culture medium for culturing anaerobic ammonium oxidation bacteria sludge as well as a preparation method and application of the culture medium. The culture medium comprises the following components: 0.45 g / L to 0.75 g / L of ammonium carbonate, 0.5 g / L to 1.0 g / L of calcium nitrite, 0.1 g / L to 0.5 g / L of magnesium sulfate, 0.5 g / L to 3 g / L of dipotassium phosphate, 0.1 g / L to 0.5 g / L of anhydrous sodium acetate, 0.5 mL / L to 2 mL / L of microelement mother liquor and 0.5 mL / L to 2 mL / L of a growth promoting agent. The culture medium provided by the invention can significantly shorten the growth time of anaerobic ammonium oxidation bacteria, and provides a basis for rapid and efficient production of anaerobic ammonium oxidation strain mud.

The application relates to the technical field of concrete preparation, in particular to an anti-freezing steel pipe concrete and a preparation method thereof, which comprises the following components in parts by weight: cement 650-670 parts, machine-made sand 540-560 parts, air-quenched aggregate 540-560 parts, high water absorption resin 3.8-4.12 parts, water reducing agent 3.0-3.2 parts, composite anti-freezing agent 10-15 parts, air entraining agent 1-2 parts and water 290-304 parts; the composite anti-freezing agent is composed of fumed silica, modified silica ash and calcium nitrite. Through the synergistic cooperation of the composite anti-freezing agent, the high water absorption resin, the air entraining agent, the water reducing agent and the air-quenched aggregate, a multi-scale and multi-mechanism anti-freezing protection system is constructed, and the freeze-thaw damage problem of the steel pipe concrete when applied in cold regions is effectively solved.

This invention discloses a coral powder cement, its preparation method, and its application, belonging to the field of cement technology. The coral powder cement's formulation, by mass percentage, includes: 45-62% silicate clinker, 10-25% aluminate clinker, 5-40% coral micropowder, 0-5% calcium nitrite, and 5-9% gypsum. The coral powder cement is prepared by uniformly mixing the silicate clinker, aluminate clinker, coral micropowder, calcium nitrite, and gypsum in a specific ratio. This invention offers advantages such as improved early strength of cement, enhanced mechanical properties of cementitious materials, effective reduction of rapid setting caused by aluminate cement, and corrosion resistance.

The invention discloses a waterproof anti-crack cement-based repair material and a preparation method thereof, and relates to the technical field of cement materials. The material disclosed by the invention comprises the following components in percentage by weight: 30-45% of Portland cement, 10-20% of high belite sulphoaluminate cement, 3-6% of a CSA expanding agent, 1-3% of reactive magnesium oxide, 5-10% of silica fume, 5-15% of fly ash, 2-4% of TiB2 powder, 0.02-0.08% of graphene oxide and 8-12% of polymer rubber powder or emulsion. 1.0-1.8 kg / m < 3 > of PVA fiber and / or 1.5-3 kg / m < 3 > of basalt fiber, 40-60% of quartz sand / corundum aggregate and a proper amount of polycarboxylate superplasticizer, defoaming agent and calcium nitrite are doped. The coating is prepared through dry mixing, ultrasonic dispersion of liquid materials, vacuum low-foam stirring and on-site rapid smearing, the 2h compression resistance is larger than or equal to 20 MPa, the 28-day dry shrinkage is smaller than or equal to 0.01%, the 24-hour chloride ion electric flux is smaller than or equal to 1200 DEG C, and the 800-degree C1h residual strength is larger than or equal to 90%. The concrete has the advantages of super early strength, low shrinkage, water resistance, impermeability, toughening, crack resistance, wear resistance, fire resistance and high constructability, and can be widely applied to rapid repair of concrete defects of bridges, tunnels and building exterior walls.

The application discloses a salt additive melt blending pretreatment method of PET products. After the PET products are crushed, the salt additive is mixed, melt blending is carried out at 268-275 DEG C for 4-5 minutes, direct cooling is carried out without quenching, crushing and 80 mesh screening are carried out, and a pretreatment product is obtained. The salt additive is selected from one or more of sodium nitrate, sodium nitrite, potassium nitrate, potassium nitrite, calcium nitrate, calcium nitrite, sodium bisulfate, potassium bisulfate, sodium phosphate and potassium phosphate, and the addition amount is 0.5%-1.0% of the mass of the crushed PET material. The method can control the crystallinity increase, improve the powder yield, and the obtained product can be used for subsequent enzymolysis.

The invention relates to the technical field of concrete mineral admixtures, and particularly discloses a method for inhibiting delayed coagulation of granulated electric furnace phosphorus slag powder and improving activity, which comprises the step of using a modifier in the preparation process of modified phosphorus slag powder, the modifier comprises a modifier A and a modifier B; the modifier A comprises the following effective components in parts by mass: 28 parts of calcium nitrite, 5-15 parts of an improved chelating agent and 0.08-0.30 part of calcium hydroxide; the improved chelating agent comprises diethanolisopropanolamine; the modifier B comprises industrial sodium silicate powder. The method has the advantages that 1) the activity index of the cement-based material doped with the granulated electric furnace phosphorus slag can be obviously improved, and the setting time of the cement-based material can be effectively shortened; and 2) in the phosphorus slag powder production process stage, precise regulation and control are implemented in the phosphorus slag particle grinding process, so that delayed coagulation inhibition and activity improvement are realized, field admixture adjustment in the concrete preparation stage is not needed, and the application problem of the granulated electric furnace phosphorus slag in a cement-based material is solved from the source.

The invention relates to the technical field of building materials, in particular to a high-performance anti-freezing grouting material and a using method thereof.The high-performance anti-freezing grouting material is prepared from, by weight, 30-45 parts of cement, 5-10 parts of silica fume, 4-8 parts of microbeads, 40-60 parts of sand, 0.2-1 part of a water reducing agent, 0.5-2 parts of a composite anti-freezing agent and 0.1-0.6 part of polymer rubber powder; the sum of the parts by weight of the components is 100 parts. Wherein the composite antifreeze agent comprises an air entraining agent, calcium nitrite and sodium sulfate. The concrete has the advantages of good mechanical properties and fluidity, no shrinkage and excellent frost resistance, and can be applied to high-latitude and high-altitude severe cold areas.

The application relates to the technical field of concrete, and specifically discloses high-performance anticorrosive concrete for ocean engineering and a preparation method thereof. The concrete disclosed by the application comprises the following components: 7000-8000 parts of sulphoaluminate cement, 1400-2000 parts of gravel, 1200-1800 parts of fly ash, 1000-1400 parts of silica ash, 200-300 parts of corrosion-resistant functional additives, 100-200 parts of reinforcing materials, 10-20 parts of water reducing agents, 4-10 parts of retarders and 3000-4000 parts of water; the corrosion-resistant functional additives are composed of calcium nitrite, vinyl ester resin and organic phosphate; and the reinforcing materials are obtained by modifying basalt fibers with zinc salt, aluminum salt and silane. The above technical scheme improves the chloride ion penetration resistance and sulphate corrosion resistance of the concrete, and enhances the structural stability and service life of the concrete in the marine environment.

The present application relates to the technical field of concrete mineral admixtures, and particularly discloses a method for inhibiting the setting of granulated electric furnace phosphorus slag powder and improving the activity, which comprises the step of using a modifier in the preparation of modified phosphorus slag powder; the modifier comprises modifier A and modifier B; the modifier A comprises the following mass fraction ratios of effective components: 28 parts of calcium nitrite, 5-15 parts of a modified chelating agent, and 0.08-0.30 parts of calcium hydroxide; the modified chelating agent comprises diethanol monoisopropanolamine; and the modifier B comprises industrial sodium silicate powder. The method has the following advantages: 1) the activity index of cement-based materials mixed with granulated electric furnace phosphorus slag can be significantly improved, and the setting time can be effectively shortened; and 2) the setting inhibition and activity improvement can be achieved by precisely controlling the phosphorus slag particle grinding process in the phosphorus slag powder production process, and the application problem of granulated electric furnace phosphorus slag in cement-based materials can be solved from the source without relying on the adjustment of the admixture in the concrete preparation stage.