42results about How to "Increase alkalinity" patented technology

The invention discloses a high-strength steel welding rod for 1000 MPa water and electricity and a preparation method and application of the high-strength steel welding rod. The invention belongs to the technical field of welding materials. The technical problems that the low-temperature impact toughness of an existing welding material for 1000 MPa-grade high-strength steel needs to be improved, and the welding cold crack sensitive index is too large are solved. The welding rod is composed of a core wire and a coating wrapping the surface of the core wire. Powder of the coating is formed by mixing marble, fluorite, rutile, silica powder, electrolytic manganese, ferrosilicon, graphite, ferromolybdenum, chromium metal, iron powder, nickel powder, sodium carbonate and sodium alginate. The welding rod has the advantages of good all-position welding process performance, stable electric arc, small flying speed, uniform coating melting, beautiful weld joint forming and good operability of welders. And weld metal has good mechanical properties. And the method is used for welding the high-strength steel for the 1000MPa-grade water

The invention discloses a method for enhancing nitrogen and phosphorus removal effects of a whole-course autotrophic nitrogen removal system, and belongs to the technical field of sewage treatment. According to the method, the steel slag powder and the steel slag particles are applied to a nitrification section and a sulfur autotrophic denitrification section respectively, alkalinity consumed by nitrification is supplemented by adding the steel slag powder in the nitrification section, enrichment of nitrifying bacteria is facilitated, metal ions leached from the steel slag powder improve the ammonia nitrogen removal rate, meanwhile, part of phosphate is removed, and the ammonia nitrogen removal rate is increased. The average removal rate of ammonia nitrogen is 99.75%, and the average removal rate of phosphate is 23.22%. According to the invention, the denitrification potential and denitrification effect of the sulfur autotrophic denitrification section are improved, and when the HRT is 3h, the average 97.04% of total nitrogen and the average 86.4% of total phosphorus can be removed; in the denitrification process, metal ions leached from the steel slag can generate precipitates with phosphate, and H < + > generated in the denitrification process can accelerate erosion of the steel slag, so that the phosphorus removal capacity of the steel slag is improved.

The invention discloses a method for efficiently leaching waste aluminum electrolyte and recovering fluorine, lithium, aluminum and sodium, belongs to the field of solid waste resource recovery, and solves the following problems of low aluminum and lithium leaching rate in an alkaline process and HF pollution in an acid process. The method comprises the following steps: crushing, grinding and screening waste aluminum electrolyte blocks to obtain waste aluminum electrolyte powder A; uniformly mixing the waste aluminum electrolyte powder A with a calcium-containing reaction auxiliary material to obtain a material B; adding the material B into an alkali solution, and carrying out a leaching reaction; separating the materials to obtain filter residues and filtrate; carrying out acid pickling purification and impurity removal on filter residues, and filtering; extracting the filtrate to obtain a loaded organic phase and raffinate; carrying out reverse extraction on the loaded organic phase; adding reaction auxiliary materials into the raffinate, uniformly stirring, reacting, standing, filtering and separating; continuously supplementing reaction auxiliary materials into the filtrate, uniformly stirring, standing, filtering and separating. According to the method, multiple components in the waste aluminum electrolyte can be efficiently recycled, and the comprehensive utilization rate is high.

The invention discloses a control method for stabilizing the alkalinity of blast furnace slag. The method comprises the following steps: collecting blast furnace production data; calculating a blast furnace theoretical alkalinity lag period; establishing a dual-control model of a control model based on the theoretical slag alkalinity under the blast furnace tank and a control model based on the actual slag alkalinity of the blast furnace, and monitoring and analyzing the abnormal fluctuation reason of the actual slag alkalinity; and then targeted alkalinity control is carried out according to the reasons of abnormal fluctuation of alkalinity. According to the method, closed-loop control is achieved from the slag alkalinity fluctuation source and the slag fluctuation reason through the theoretical slag alkalinity and actual slag alkalinity dual-control model, the slag alkalinity fluctuation reason can be judged rapidly and comprehensively, targeted measures are taken for different reasons, the slag alkalinity is stabilized more accurately and rapidly, the blast furnace is kept stable, and the method is suitable for large-scale popularization and application. The steel production quality is improved.

The invention relates to a charcoal-based compound fertilizer for improving soil acidification and a preparation method thereof, and belongs to the technical field of agriculture. Magnesium element, plant source biomass and animal source biomass are jointly pyrolyzed to prepare magnesium-containing biochar, chitin is introduced, and modified biochar rich in multiple nutrient elements is prepared. The biochar not only has the fertilizer efficiency of traditional organic fertilizers, but also can remarkably increase the pH value of soil, and meanwhile, the soil structure improvement capability and the water and fertilizer retention capability of the biochar are enhanced. Besides, the modified biochar is compounded with humic acid, amino acid, sodium carboxymethyl cellulose, attapulgite, corn starch and the like to prepare the biochar-based compound fertilizer, and the fertilizer can significantly improve soil acidification, improve soil fertility, promote plant growth and development and improve crop yield and quality; and the fertilizer also has the advantages of long-acting slow release and enhancement of plant stress resistance.

The invention provides a degreasing agent and a body-in-white pretreatment process. The degreasing agent comprises a compound agent, and the compound agent comprises the following components in percentage by weight: 1%-5% of hydroxide, 50%-60% of carbonate, 20%-30% of silicate, 5%-10% of sodium pyrophosphate and 13%-20% of a chelating agent. The body-in-white pretreatment process comprises the following steps: a flood water washing procedure: washing and preheating a plate of a body-in-white; a pre-degreasing step in which a pre-degreasing bath solution is sprayed onto the surface of the plate by means of spraying; a main degreasing procedure, specifically, a main degreasing bath solution containing the degreasing agent is used for conducting degreasing treatment on the plate, the free alkalinity of the main degreasing bath solution is controlled to range from 16 Pt to 19 Pt, and the oil content of the main degreasing bath solution is controlled to be smaller than 3.0 g / L; and an industrial water washing procedure: washing the plate to remove the main degreasing bath solution remaining on the surface of the plate.

The invention provides a method for preparing low-sulfate rare earth carbonate by using a mixed precipitator, and belongs to the technical field of hydrometallurgy. According to the method provided by the invention, after a sulfuric acid rare earth solution and a mixed precipitator solution are added in a parallel flow manner, a heat preservation reaction is performed. The mixed precipitant is used for precipitation, the alkalinity of the precipitant is improved, and carbon emission and wastewater amount in the precipitation process are effectively reduced. The method solves the problem of high content of sulfate radical impurities in the conversion process of rare earth chloride by a mixed sulfuric acid rare earth feed liquid ammonium bicarbonate precipitation method, and solves the problem of high cost caused by adoption of a related organic extraction agent in the conversion process of an extraction method. In the obtained rare earth carbonate, the REO content is 50-65%, and the sulfate radical content is 1t; and 0.01% of the total weight.

The present application belongs to the technical field of white carbon black preparation, and particularly relates to an industrialized preparation method for preparing high-purity low-fluorine white carbon black by taking fluorine-containing silicon slag as raw material, and through mechanical activation, composite alkali leaching, fractional impurity removal, low-temperature crystallization and surface modification. The present application can realize harmless disposal of the fluorine-containing silicon slag and high-value regeneration and utilization of fluorine and silicon resources, has good environmental protection value and economic benefits, and has wide industrialized application prospect.

The invention discloses a preparation method of a high-specific-surface-area polymer-based magnesium artificial wetland filter material. The preparation method comprises the following steps: firstly, respectively preparing a water phase containing magnesium salt and an emulsifier, and an organic phase; then slowly dropwise adding the water phase into the organic phase in a trickling filtration manner, so that the water phase forms tiny liquid drops in the organic phase, a polymerization reaction is carried out on an interface, and a magnesium ion embedded polymer matrix is formed; carrying out foaming treatment on the polymer matrix embedded with the magnesium ions, and rapidly cooling; and finally, separating a blank body through suction filtration, cleaning, drying and screening to obtain the filter material. The filter material obtained by the method disclosed by the invention can regulate the pH value of a water body and slowly release magnesium ions, enhance the nutrient supply of plants and improve the wetland function in a low-temperature environment, and has a high specific surface area.

The invention discloses an organic-inorganic hybrid antimony-based nonlinear optical crystal material as well as a preparation method and application thereof, and belongs to the technical field of optical materials. DMSO has high polarity, high boiling point, good thermal stability and good solubility, the DMSO becomes an appropriate reaction solvent in a Sb < 3 + > system due to the characteristics, meanwhile, oxygen atoms or sulfur atoms on the DMSO have nucleophilicity, so that the DMSO has alkalinity and coordination and can form coordinate bonds with metal cations, and therefore, the DMSO can also be used as a reactant, and the Sb < 3 + > system can be used for preparing the Sb < 3 + > system. The triangular pyramid structure can enrich the structure of the Sb-based compound. According to the invention, dimethyl sulfoxide (DMSO) is taken as a solvent, and a solvent evaporation method is adopted to grow the crystal, so that the problem of hydrolysis of Sb < 3 + > is effectively avoided, the research thought and method of Sb < 3 + > are broadened, and structural distortion is increased due to introduction of DMSO, so that the optical performance of the compound is improved.

The invention relates to self-excitation geopolymer concrete and a preparation method thereof, and belongs to the technical field of inorganic cementing materials, the self-excitation geopolymer concrete is composed of a powder material and a liquid material; the powder material is composed of Portland cement, fly ash, blast furnace slag, graded aggregate, modified calcium carbonate whiskers, sepiolite-loaded aluminum hydroxide, calcium tetraborate powder and polycarboxylate superplasticizer powder, and the liquid material is composed of sodium hydroxide, a tetrabutyl phosphorus hydroxide aqueous solution, a sodium water glass solution and water; according to the self-excited geopolymer concrete prepared by the invention, the 28-day compressive strength is 83.4 to 86.6 MPa, the 28-day breaking strength is 11.5 to 13.2 MPa, the 28-day dry shrinkage rate is 0.02 to 0.05 percent, the 28-day tensile bonding strength is 5.1 to 6.2 MPa, the 100-time circulating compressive strength loss rate in the aspect of freeze-thaw resistance is 0.4 to 0.8 percent, and the 100-time circulating tensile bonding strength loss rate is 0.3 to 0.6 percent.

The invention discloses a magnetized graphene-nano silicate gel and a preparation method thereof. The amount of each component is weighed according to the mass ratio, nano silicon oxide and ultrafine powder clinker are put into a planetary mixer for stirring, deionized water is added to stir a gelling component slurry, after standing, deionized water and orthosilicic acid are added while stirring the slurry to obtain an initial silicate gel; a dissolving agent is then added dropwise at a uniform speed while stirring to obtain a dissolved silicate gel, a nano cellulose solution is added to the dissolved silicate gel, a silane coupling agent is added and stirred to obtain a nano silicate gel suspension, graphene is added for magnetization, the suspension is allowed to stand, water is filtered and dried to obtain the magnetized graphene-nano silicate gel powder, which can be applied to concrete to improve the flexural and compressive strength of early concrete and improve the cohesiveness and segregation of concrete.

The present invention relates to the field of protective slag technology, and in particular to a protective slag and a granulating device thereof for solving the slag inclusion problem of 310 steel grades. The protective slag is a hollow spherical particle with a particle size of 0.2mm-0.5mm. The raw materials of the protective slag include 6%-10% soda ash, 7%-11% fluorite, 6%-10% bauxite, 5%-12% B2O3, 3%-5% MnO, 2%-4% carbon black, 1%-3% MgO, and the rest are magnesium slag, heavy calcium powder, and wollastonite. The slag basicity is 1.2-1.5 in terms of CaO / SiO2, and the viscosity is 0.12-0.15 Pa·s at 1300°C. The particle size of carbon black is 500 nanometers-5 microns, and the particle size of other raw materials is 45 microns-55 microns. The carbon black is coated on the outside of other raw materials and evenly distributed in each hollow spherical particle. The protective slag is used for 310 steel grades to reduce the occurrence of slag inclusion problems.

This invention provides a road base material based on sludge and construction waste, its preparation method, and its application. The road base material includes a base component and an admixture component. The base component includes: 45-55% recycled coarse aggregate, 20-35% recycled fine aggregate, 15-25% sludge, 4-6% cement, and 1-4% water. Both the recycled coarse and fine aggregates are derived from construction waste. The admixture component includes quicklime, sodium hydroxide, and zinc ricinoleate. The mass percentage of quicklime to sludge is 4-8%, the mass percentage of sodium hydroxide to sludge is 0.1-0.2%, and the mass percentage of zinc ricinoleate to sludge is 0.2-0.5%. This invention promotes the high-value utilization of urban solid waste such as sludge and construction waste, and yields a higher-performance road base material based on sludge and construction waste.

The invention provides a method for removing organochlorine in an oil product, belongs to the technical field of petroleum processing, and particularly relates to a method for removing organochlorine in an oil product. The method comprises the following steps: mixing a phase transfer catalyst, a nucleophilic reagent, a demulsifier, deionized water and an oil product, carrying out a reflux stirring reaction at 80-120 DEG C for 0.5-2 h, cooling, standing, and carrying out oil-water separation to obtain a dechlorinated oil product. The phase transfer catalyst is added into the reaction system, so that the oil phase and the water phase are in full contact, the reaction rate is increased, and a better dechlorination effect is achieved. The method is convenient to operate and simple in process, the chlorine content in the oil product can be obviously reduced, meanwhile, the components of the oil product cannot be changed, and the problems of equipment corrosion, catalyst poisoning, ammonium salt blockage and the like of an oil refinery are effectively solved.

The invention provides a method for improving concrete color difference by using regenerated micro-powder loaded with a chemical additive and concrete prepared by using the method. The regenerated micro-powder loaded with the chemical additive comprises regenerated micro-powder loaded with melamine and regenerated micro-powder loaded with sodium alginate. The regenerated micro powder obtained after carbonization treatment of the waste concrete is used for loading sodium alginate and melamine, the regenerated micro powder acts on different stages of plastic change / cement hydration of the concrete, early bleeding and later bleeding are reduced, uniform distribution of moisture, solid phases and the like is promoted, the appearance color difference (especially large-flow-state concrete) of the concrete after form stripping can be obviously improved, and the service life of the concrete is prolonged. The overall color consistency of the concrete structure is improved, and meanwhile, the method also has a positive effect on promoting absorption of building solid waste.

This invention relates to the field of comprehensive utilization technology of iron and steel smelting resources, specifically to a method for the direct recycling and utilization of iron-rich red mud in converter steelmaking. The method includes the following steps: Step 1: Retaining slag, including MgO, in the converter for slag splashing and furnace protection; Step 2: Adding fine-grained limestone to the converter; Step 3: Adding iron-rich red mud to the converter, and shaking the converter 2-3 times after the mud has been added; Step 4: Verticalizing the converter and blowing nitrogen into it at least once using a top-blowing method, with each blowing lasting 3-5 seconds and an interval of 10 seconds between each blowing; Step 5: Adding scrap steel to the converter, waiting 0-5 minutes, then adding molten iron and starting the blowing process. This invention directly applies iron-rich red mud to the converter steelmaking process, achieving dephosphorization of molten iron with high phosphorus content without the use of flux.

The present application belongs to the field of comprehensive utilization of solid waste resources, and relates to a calcium silicate board synthesized from industrial solid waste and a preparation method thereof. The calcium silicate board comprises oil-removed waste diatomite, fly ash, slaked lime, fiber and activator. In the present application, wood fiber is modified by hydrothermal treatment with citric acid modification, so as to reduce the water absorption of the wood fiber. The modified wood fiber is compounded with rock wool fiber to exert the tensile strength of the modified wood fiber and the heat resistance and chemical stability of the rock wool fiber. In the present application, a pre-hydration process is designed. After the oil-removed waste diatomite is mixed with the fly ash and reacts with excess calcium hydroxide, the product can provide nucleation sites as crystal nuclei, significantly accelerating the hydration kinetics process of the system. In combination with a continuous two-stage temperature-controlled steam pressure curing process, the crystal phase content of tobermorite in the calcium silicate board is increased, and the macroscopic performance of the material is comprehensively improved. Moreover, the present application can absorb a large amount of oil-containing waste diatomite and fly ash, realizing the resource utilization of industrial solid waste.

The invention discloses a modified solid base catalyst, a preparation method and application, the preparation method comprises the following steps: potassium salt, magnesium-aluminum hydrotalcite and gamma-Al2O3 are used as raw materials, the modified solid base catalyst is prepared by an impregnation method, and the potassium salt comprises at least one of alkaline potassium salt and salt capable of being decomposed to obtain potassium oxide. The potassium salt is adopted to modify the magnesium-aluminum hydrotalcite solid base catalyst, hydrotalcite is an alkaline molecular sieve and has good catalytic activity due to a unique lamellar large-framework structure and a high specific surface area, and the alkalinity of the solid base catalyst can be further enhanced by introduction of the potassium salt, so that the solid base catalyst has good catalytic activity. Therefore, the yield of monoglyceride can be improved when the catalyst is applied to preparation of monoglyceride by a transesterification method; meanwhile, gamma-Al2O3 is introduced into the catalyst, so that the repeated use capability of hydrotalcite can be improved while the excellent catalytic performance of hydrotalcite is retained, and industrial application is facilitated.

The invention relates to the technical field of concrete additive equipment, in particular to a temperature-sensitive microcapsule with internal curing and anti-corrosion functions as well as a preparation method and application thereof, and the preparation method comprises the following steps: adding an anti-corrosion curing material into deionized water to obtain an inner core solution; dissolving an initiator in deionized water to obtain an initiator solution; dissolving a monomer material and a cross-linking agent in deionized water, and stirring under the protection of nitrogen until the monomer material and the cross-linking agent are completely dissolved to obtain a shell solution; and respectively pumping the inner core solution and the shell solution into different channels of a micro-fluidic chip, dripping liquid drops obtained in the chip into an initiator solution under the protection of nitrogen, reacting in a constant-temperature water bath, cooling to room temperature, and centrifuging to obtain the temperature-sensitive microcapsule. By adopting the steps, the obtained temperature-sensitive microcapsules are uniform in morphology and high in stability, and the performance of concrete can be improved by the anti-corrosion curing material released at the phase change temperature and the dehydrated shell.

The invention relates to novel sintered ore and a preparation method thereof, and belongs to the technical field of sintering. The novel sintered ore is prepared from the following raw materials in parts by weight: 50 to 51 parts of fine powder, 6.5 to 7.5 parts of lime, 12 to 13 parts of limestone, 4 to 4.2 parts of coke powder, 10 to 11 parts of high return rate and 14 to 15 parts of self return rate. Metal materials in the raw materials are all fine powder, the proportion of lime and other components is optimized, the alkalinity of the sintered ore is improved, Ca (OH) 2 colloidal particles formed after the high-alkalinity sintered ore raw materials are subjected to water beating digestion have extremely high water absorption and are beneficial to reducing the over-wet phenomenon of a sintered material layer, lime is digested into exothermic reaction, the material temperature is increased, and the service life of the sintered ore is prolonged. The air permeability of the sintered ore is improved, the utilization coefficient of fine powder sintering reaches 2.0 t / m < 2 >. H or above, and the utilization rate of whole fine powder sintering is increased.

The invention discloses a waterproof, antifouling and antibacterial copolymer protective layer and a preparation method thereof, and relates to the technical field of antifouling coatings. The preparation method at least comprises the following steps: mixing octamethylcyclotetrasiloxane and aminopropyltrimethylsilane for reaction to obtain a side chain amino modified polysiloxane polymer; mixing the side chain amino modified polysiloxane polymer with quaternary ammonium salt-containing epoxy resin, magnetically stirring uniformly, adding tetraethoxysilane and dibutyltin diacetate, and vacuumizing and defoaming to obtain a waterproof, antifouling and antibacterial copolymer coating; the waterproof, antifouling and antibacterial copolymer coating is wiped or sprayed on the dry and clean surface of a base material, and after drying and curing, the waterproof, antifouling and antibacterial copolymer protective layer is obtained. The waterproof, antifouling and antibacterial copolymer protective layer prepared by the invention covers the surface of a base material, is odorless, nontoxic, anti-aging, waterproof, oil-proof, antibacterial, mildew-proof, antifouling and doodling-proof, and has excellent antifouling and self-cleaning functions.

The invention discloses a calcium-aluminum composite emulsion and a preparation method and application thereof, and belongs to the technical field of industrial solid waste treatment and environmental protection. The settling agent is mainly prepared from aluminum oxide and calcium oxide composite powder, and is high in settling rate and good in settling effect. The preparation method comprises the following steps: carrying out ball milling treatment on aluminum oxide and calcium oxide, adding nonionic polyoxyethylene amide and nonionic polyacrylamide, stirring, and dropwise adding ethylene glycol in the stirring process to prepare a calcium-aluminum composite emulsion; the effective calcium content, the permeability and the precipitation performance of the calcium-aluminum composite emulsion are improved by adopting aluminum oxide and subsequent ball milling treatment, then phosphorus and fluorine pollutants in phosphorus and fluorine wastewater and phosphogypsum can be rapidly and effectively precipitated, the treated phosphogypsum conforms to first-class solid waste, and the treated phosphorus and fluorine wastewater also conforms to the national standard. The technical problem that phosphorus and fluorine cannot be efficiently removed at the same time due to low effective calcium content and poor permeability of a traditional lime agent is solved.

This invention discloses a lithium slag composite admixture, low-carbon lithium slag concrete, and their preparation method, belonging to the field of concrete technology. The method includes the following steps: preparing calcium-type lithium slag synthetic zeolite using lithium slag; preparing lithium slag-based negatively charged mesoporous silica using the waste liquid generated during the preparation of the calcium-type lithium slag synthetic zeolite; and finally mixing the calcium-type lithium slag synthetic zeolite, the lithium slag-based negatively charged mesoporous silica, and the undisturbed lithium slag to obtain the composite admixture. This invention solves the problem of excessively high SO3 content in lithium slag concrete under high admixture dosage, and also addresses the technical defects of insufficient lithium slag activity and low concrete strength, effectively reducing the cracking risk of lithium slag concrete, comprehensively improving the density and workability of lithium slag concrete, and realizing the high-value-added resource utilization of lithium slag solid waste.

The invention discloses a method for promoting growth of intercropping crops based on a soil micro food web and application of the method, and belongs to the technical field of crop planting. According to the invention, it is found for the first time that by adding a specific type of bacterial-feeding nematodes into soil, synergistic improvement of growth indexes such as plant height, stem diameter and biomass of two crops can be obviously and stably promoted; the application method is simple and easy to operate, the cost is controllable, and no additional farming equipment or steps are needed; the method is high in environmental compatibility, is particularly suitable for a farmland peanut-corn intercropping system in alkaline and calcareous soil, can effectively improve the crop growth performance, farmland productivity and agricultural product yield and quality, can optimize the soil ecological function, continuously increases the economic benefits of farmers, and has wide application prospects. A brand-new, low-cost and easy-to-popularize candidate scheme is provided for agricultural green sustainable development of the alkaline soil area in North China, and the application prospect is wide.

The invention discloses a low-chlorine catalyst for preparing propylene carbonate. The low-chlorine catalyst for preparing propylene carbonate of the invention has the following chemical composition by mass: nitrogen content of 3.6-10.9%, oxygen content of 12.1-14.4%, bromine content of 6.1-9.0%, chlorine content of 0.1-0.4%, samarium content of 12.2-17.2%, Si content of 2.3-2.7%, and the remainder of carbon and hydrogen. The catalyst of the invention has the characteristics of high activity and low cost, the catalyst has significant stability, and the active component is not easy to lose during the reaction; at the same time, the catalyst has a low chlorine content, the corrosion to the equipment is small, and the propylene carbonate product has good quality.

The invention provides a preparation method of a lithium-rich manganese-based ternary precursor. The preparation method comprises the following steps: respectively preparing a nickel-cobalt-manganese mixed salt solution, a sodium carbonate solution and an ammonia water solution; adding water and ammonium bicarbonate into the preparation device, controlling the pH value of the solution in the reaction kettle to be 7-11, then adding a reducing substance, introducing protective gas into the preparation device, and keeping the solution in the preparation device to circulate; the prepared three solutions are introduced into a reaction kettle for stirring reaction, the reaction temperature is 45-65 DEG C, the pH value of the solutions is 7.0-9.0, and shielding gas is continuously introduced in the reaction; starting a cleaning function of the concentration machine after feeding for 1-6 hours, and continuously increasing the alkalinity and temperature of the solution and reducing the stirring rotating speed; and aging, alkali washing, water washing and drying the reaction product to obtain the lithium-rich manganese-based ternary precursor. The lithium-rich manganese-based ternary precursor prepared by the preparation method of the lithium-rich manganese-based ternary precursor provided by the invention can be used for preparing a lithium-rich manganese-based positive electrode material with high capacity and long cycle.

The invention discloses mortar based on a solid waste-based material and a preparation method of the mortar, and belongs to the technical field of building materials. The mortar is prepared from the following components in parts by weight: 315 to 360 parts of cement, 13.5 to 22.5 parts of metakaolin, 45 to 58.5 parts of waste clay brick powder, 13.5 to 27 parts of limestone powder, 9 to 13.5 parts of carbide slag, 9 to 13.5 parts of quick lime, 1350 parts of standard sand, 225 parts of water, 5.4 to 10.8 parts of nano C-S-H seed crystal and 0.09 to 0.225 part of alkanolamine. The bagasse ash and the carbide slag are used for preparing the nano C-S-H, so that resource utilization is realized; the used solid waste-based material particles are not only mutually filled, but also generate a chemical synergistic effect to promote generation of more hydration products, so that the performance of the mortar is improved; the selected additive has a synergistic effect in the aspect of promoting hydration, so that the performance of the mortar is further improved; various solid waste-based materials are used in the preparation process, so that the resource utilization rate is increased.

The utility model discloses a kind of total nitrogen of difficult degradation wastewater synergic treatment system, belong to sewage treatment technical field.The total nitrogen synergic treatment system includes water inlet, anoxic tank, aerobic tank, device tank body, effluent recirculation pipeline, nitrogen recovery device and water outlet;The device tank body inside is equipped with heterotrophic denitrification filler area, sulfate-reducing bacteria filler area and sulfur autotrophic denitrification filler area;Gas seal baffle and inclined baffle are equipped in the upper portion of the device tank body.The system couples heterotrophic denitrification, sulfur autotrophic denitrification and sulfate-reducing bacteria, without additional carbon source, sulfur source and alkalinity, reduce sulfate pollution and H + The system overflow in sulfur autotrophic denitrification process, total nitrogen load is high, total nitrogen treatment effect is strong, and effluent quality is good.

The present application belongs to converter steelmaking technical field, provide a kind of LF refining quick slag melting method, the present application is injected with pre-melting agent along with molten steel in the process of converter tapping, the composition of pre-melting agent is according to mass percentage respectively: calcium oxide 60-70%, lithium oxide 4-7%, silicon dioxide 3-6%, calcium fluoride 5-10%, magnesium oxide 4-8%, di-aluminum oxide 10-15%, by adding the above pre-melting agent in the process of tapping, while improving the basicity of slag, effectively reduce the melting point of slag, promote the rapid melting of slag, shorten the LF refining station furnace slag melting time, and inhibit the occurrence of phosphorus, reduce the LF refining smelting time, provide good guarantee for rolling quality.The application of the present application can provide a reliable smelting method for improving production efficiency for operators, which can effectively reduce production cost, while ensuring the purity of molten steel.