142 results about "Sodium carbonate" patented technology

The invention discloses a fluoride salt-free nitrate-free cast iron enamel semitransparent glaze as well as a preparation method and application thereof, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, potassium feldspar, zinc oxide, lithium carbonate, zirconium silicate, titanium dioxide, aluminum oxide, trisodium phosphate, antimony oxide, magnesium carbonate and barium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and low-temperature firing adaptability, and is suitable for cast iron matrixes, the firing temperature is 740-760 DEG C, and the firing time is 2-3 hours. The method can be used for producing green and environment-friendly enamel products.

The invention discloses a production method of distiller's grain fermentation liquid fertilizer specially applied to roxburgh rose. The distiller's grain fermentation liquid fertilizer is prepared bythe step of evenly mixing 50 to 80 parts of distiller's grain fermentation extracting solution, 0.5 to 1 part of microelement, 5 to 10 parts of seaweed meal, 5 to 10 parts of natural active organism,2 to 5 parts of potassium bicarbonate, 2 to 5 parts of natural active organism and 2 to 5 parts of natural surface active agent. A preparation method of the distiller's grain fermentation extracting solution comprises the steps: evenly stirring 50 to 80 parts of distiller's grain, 50 to 150 parts of rice washing water, 1 to 2 parts of EM microflora fermentation liquid and 0.5 to 1 part of sugar, performing composting fermentation at the room temperature to obtain a distiller's grain fermentation material, stirring and extracting through a sodium carbonate water solution, filtering and performing evaporation and condensation on obtained filtrate until the density is 1.1 to 1.2 to obtain distiller's grain fermentation extracting solution. The distiller's grain fermentation liquid fertilizerdisclosed by the invention has a good use effect, meanwhile can effectively prevent pest and disease damage to the roxburgh rose and is high-efficiency environment-friendly liquid fertilizer.

The invention discloses fluoride-salt-free and nitrate-free medium-temperature semitransparent glaze for steel plate enamel as well as a preparation method and application of the medium-temperature semitransparent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, potassium feldspar, anhydrous borax, sodium carbonate, titanium dioxide, monopotassium phosphate and zinc oxide according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 800-840 DEG C and the firing time of 20-30 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride-salt-free and nitrate-free high-temperature acid-resistant translucent glaze for steel plate enamel as well as a preparation method and application of the translucent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, titanium dioxide, trisodium phosphate, potassium carbonate, lithium carbonate, aluminum oxide, zinc oxide and sodium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 840-880 DEG C and the firing time of 820-830 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride salt-free and nitrate-free low-temperature matte glaze for steel plate enamel as well as a preparation method and application of the low-temperature matte glaze, and belongs to the technical field of enamel. The matte glaze is prepared from quartz, borax pentahydrate, sodium carbonate, titanium dioxide, magnesium oxide, monopotassium phosphate, calcium carbonate, zinc oxide, magnesium carbonate, lithium carbonate, aluminum oxide and zirconium silicate according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1300 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. The matte glaze completely avoids the use of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are eliminated from the source, the fluorine content of the product is not detected through detection, and the limit value requirements of European Union REACH regulations are met. Zinc oxide and ZnO / TiO2 are added, so that the liquid phase viscosity is reduced, ion diffusion is accelerated, and the opacity (opacification performance) and gloss of the porcelain glaze are enhanced.

The invention relates to a process for preparing a phosphor copper rod by using a phosphonate-amide composite purifying agent as a quenching aid, and belongs to the technical field of non-ferrous metallurgy. Phosphorus pentoxide and sodium carbonate are mixed and decocted into fused salt, the fused salt is cooled and ground and then added into a corundum crucible together with scrap copper to be rapidly heated, compressed air is blown in, and slagging-off is conducted after heat preservation and standing; blowing mixed gas into the melt for reduction refining; adding calcium boride into the melt for refining; the refined copper liquid is subjected to continuous casting and continuous rolling; rapidly immersing the phosphorus copper rod subjected to continuous casting and rolling into a quenching aid solution, and carrying out quenching treatment; and the quenched phosphor copper rod is blow-dried and dried, and the high-conductivity phosphor copper rod is obtained. The high-purity phosphorus copper rod prepared by the method is excellent in key indexes of copper content, phosphorus content and conductivity, and meets the expected requirements of high purity and high conductivity.

The invention discloses a hardness removal method and system for a sulfate-based mine water concentrated solution, and the method comprises the following steps: sequentially introducing the sulfate-based mine water concentrated solution into a coagulating basin and a flocculation basin for chemical treatment, and allowing the treated mine water concentrated solution to enter a sedimentation basin for standing to obtain softened effluent; wherein lime or sodium hydroxide and a coagulant are put into the coagulating basin, and the coagulating basin is used for carrying out coagulating treatment on the mine water concentrated solution; sodium carbonate, a coagulant aid and an inducer seed crystal are put into the flocculation basin and used for carrying out flocculation treatment and precipitation reaction on the mine water concentrated solution subjected to coagulation treatment, the standing time of the flocculation basin is 14-45 minutes, the precipitation reaction time is 6-30 minutes, and the excessive amount of sodium carbonate is 1.5-2.5 mmol / L. According to the invention, the hardness of calcium in softened water can be lower than 20mg / L.

The invention discloses a micro-fine particle gold ore normal-pressure alkaline leaching pretreatment method based on sodium percarbonate reinforcement, and belongs to the field of precious metal metallurgy. The method comprises the following steps: adding an oxidizing agent sodium percarbonate in batches under the condition that air is filled into ore pulp, starting to monitor the oxidation potential and the pH value of a reaction system after adding, judging that the reaction reaches the end point when the sudden drop amplitude of the oxidation potential of the ore pulp within one hour is greater than or equal to 30mV and the pH value is increased by 0.3-0.5 unit, and stopping aeration to finish pretreatment; in the segmented oxidation process, the oxidation potential is controlled within the range of + 520 mV to + 550 mV by dynamically adjusting the air charging rate. According to the basic technical scheme, the gold leaching rate reaches 86.01%, the gold leaching rate reaches up to 88.92% through the optimized technical scheme, and the utilization rate of gold ore resources is remarkably increased.

A method for preparing baking soda from baking soda desulfurized fly ash comprises the following preparation steps: step 1, dissolving baking soda desulfurized fly ash in water to obtain a mixed solution A; 2, filtering the mixed solution A through microporous filter paper or a filter membrane to obtain supernate B; step 3, mixing and stirring the supernate B and a precipitant C for 1-5 hours to obtain a mixed solution D; step 4, filtering the mixed solution D through microporous filter paper or a filter membrane to obtain a supernatant E; step 5, adding 1-8% of a regulator F into the supernate E, and uniformly stirring to obtain liquid G; step 6, continuously adding aeration H into the liquid G, and adjusting the pH to be alkaline to obtain a solution J; 7, the solution J is heated, evaporated and crystallized, solid crystals are obtained and fully ground, and regenerated baking soda can be obtained; the preparation method is simple, the recovery rate of baking soda is high, and large-scale batch production can be carried out.

The utility model discloses a system for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, which is characterized in that the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.

The invention relates to the technical field of soda ash chemical industry and big data, in particular to a multi-source multi-scale sample database building method and system for soda ash production, and the method comprises the steps: unifying the format of data related to soda ash production into a CSV lightweight format; identifying and correcting parameter abnormal data; automatically subtracting the flow accumulated value into an hour difference value; checking and processing the flow accumulated value re-metering condition of the instrument; on the basis of the current integral coefficient, dividing the parameter values taking 24 hours or 8 hours as the updating frequency into parameter values taking 1 hour as the updating frequency; and extracting and matching parameter description information and numerical values, forming a two-dimensional standard data format, and constructing a multi-source multi-scale sample database. According to the method, a two-dimensional standard data format is formed, a multi-source and multi-scale sample database is constructed, and multi-source and multi-scale data association is realized; and real-time updating of the sodium carbonate production sample database is realized.

The invention relates to a soda ash calcining furnace riding wheel adjustment data calculation method based on an Excel table, and belongs to the technical field of equipment maintenance. According to the method, a parameter input area is established in an Excel table, the original diameter of a rolling ring, the diameter of the turned rolling ring, the original diameter of a riding wheel, the diameter of the turned riding wheel and the included angle between the center of the rolling ring and the center of the riding wheel are set, and the thickness and the translation amount of a riding wheel base plate are obtained after calculation. The method is accurate in calculation and high in calculation efficiency, only needs to master the basic operation of Excel, reduces the use threshold, is suitable for most maintainers, can be widely popularized in equipment maintenance in the sodium carbonate industry, improves the overall maintenance efficiency, and has remarkable progress compared with the prior art.

The invention discloses an oxygen-controlled inversely-proportional alkaline slag system 2.25% Cr-1% Mo-0. 25V steel welding rod for a hydrogenation reactor and a preparation method thereof, and belongs to the technical field of welding materials. The problem that a 2.25% Cr-1% Mo-V steel welding rod is poor in low-temperature toughness is solved. The welding rod is composed of a core wire and a coating on the surface of the core wire. The coating comprises CaF2, CaCO3, iron powder, quartz, 45 # ferrosilicon, electrolytic manganese, metal chromium powder, molybdenum powder, nickel powder, magnesium powder, titanium-boron alloy and sodium carbonate. A CaF2-CaO-SiO2 type inverse-proportion low-hydrogen alkaline slag system is adopted, so that non-metallic inclusions of deposited metal can be reduced, and weld joints are purified; and magnesium powder and MgO which has a deoxidizing effect and reacts with Mg and O are added into the coating, so that the alkalinity of the slag is improved, the inclusions in the slag are further reduced, the purity of the welding seam is improved, and the low-temperature impact toughness of deposited metal is improved. The welding rod is used for hydrogenation reactor welding.

The invention relates to a comprehensive purification treatment system for bypass vent ash, which is characterized in that bypass vent ash slurry is fed into a primary washing filter press for solid-liquid separation to obtain a primary filter cake and primary filtrate; the chloride ions in the filter cake are further reduced through two times of online washing in the first-stage washing filter press; feeding the primary filtrate into a reaction tank, inputting sodium carbonate and a heavy metal capturing agent into the reaction tank, inputting the mixed solution into a secondary washing filter press for solid-liquid separation to obtain a secondary filter cake and secondary filtrate, feeding the secondary filtrate into a neutralization tank for acid-base neutralization, and outputting a neutralization solution with the pH value meeting the requirement; heating the neutralization solution to an evaporation temperature, passing through a multi-effect evaporation and crystallization device which comprises the steps of firstly entering an evaporator for evaporation and concentration, and then entering a crystallization separator to obtain a concentrated solution containing crystalline salt; the concentrated solution containing the crystal salt is sent to a thickener for concentration, the crystal salt is separated out through a centrifugal machine, and the separated mother solution is returned to the evaporative crystallization device. According to the method, a closed operation process is adopted in the whole process, full-automatic control is achieved, the bypass exhaust ash pollutant removal route is clear, and automation, harmlessness, recycling and zero emission are achieved.

The invention relates to the field of glass products, and particularly discloses a light-weight glass bottle formula and a processing technology thereof. The formula of the light-weight glass bottle comprises 17.3%-19.1% of quartz sand, 4.6%-5.0% of sodium carbonate, 2.9%-3.2% of calcite, 5.0%-5.5% of potassium feldspar, 0.70%-0.85% of a clarifying agent, 0.23%-0.28% of chromium powder, 0.39%-0.47% of mirabilite, 0.009%-0.011% of carbon powder and 63.8%-70.5% of glass particles, wherein the glass particles are particles with the particle size of 5 mm to 20 mm, and the particles are prepared by smashing recycled colorless glass waste and removing impurities. The light-weight glass bottle formula provided by the invention has the advantage of synchronously ensuring the internal pressure strength and the mechanical impact strength of the glass bottle on the premise of realizing the light weight of the glass bottle.

The invention discloses fluoride-salt-free and nitrate-free medium-temperature acid-resistant translucent glaze for steel plate enamel as well as a preparation method and application of the translucent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, titanium dioxide, trisodium phosphate, potassium carbonate, lithium carbonate, aluminum oxide, zinc oxide and sodium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 800-840 DEG C and the firing time of 20-30 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses a fluoride-salt-free and nitrate-free stainless steel enamel low-temperature cobalt-nickel ground coat as well as a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, titanium dioxide, magnesium carbonate, monopotassium phosphate, sodium carbonate, potassium carbonate, potassium feldspar, calcium carbonate, barium carbonate, ferric oxide and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The ground glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the ground glaze has good porcelain surface, luster and firing adaptability and is suitable for stainless steel substrates, the firing temperature is 760-800 DEG C, and the firing time is 2-3 hours. The method can be used for producing green and environment-friendly enamel products.

The invention provides a photovoltaic energy storage power supply electrodialysis method and equipment for preparing sodium carbonate from mirabilite, and the method comprises the following steps: in daytime, a photovoltaic array generates power to directly provide direct current for an electrodialyzer to drive the mirabilite to produce the sodium carbonate; meanwhile, surplus electric power is stored in an energy storage system; if the photovoltaic power generation is insufficient, the energy storage system supplements power supply; at night, the photovoltaic array stops generating power, and the energy storage system discharges to provide direct current for the electrodialyzer to maintain production; the energy management system monitors the photovoltaic power generation power, the state of the energy storage system and the load of the production line in real time; according to the monitoring data, the energy management system intelligently dispatches the electric power flow direction; the central controller coordinates energy supply and production processes; and the product post-treatment system is used for concentrating, crystallizing and drying the product of the electrodialyzer.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel high-temperature ground coat as well as a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, barium carbonate, potassium feldspar, magnesium carbonate, copper oxide, manganese oxide, aluminum oxide and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1290 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The application discloses a kind of fabricated prefabricated rainwater and sewage well processing technology, comprising the following steps: step one, make forming steel reinforcement frame, and install the steel reinforcement frame after forming to outer sheath;Step two, clean pouring mold, and the outer sheath with steel reinforcement frame is arranged to pouring mold;Step three, mix concrete, and pour the mixed concrete into pouring mold;Step four, make continuous rotation pouring mold, and add sodium carbonate to the rotating mold, so that pouring mold can be quickly shaped into water well prefabricated part during rotation;Step five, the water well prefabricated part after shaping carries out demolding work;Step six, the water well prefabricated part after demolding is arranged to curing room, and carries out steam curing work.The fabricated prefabricated rainwater and sewage well processing technology uses outer sheath as steel reinforcement frame as support piece, which can effectively avoid the steel reinforcement frame exposed outside the water well prefabricated part, thereby ensuring the uniformity of subsequent water well prefabricated part stress, improve the stress safety of water well prefabricated part.

The invention relates to the technical field of microcrystalline plates, in particular to an industrial microcrystalline plate manufactured from graphite tailings and a manufacturing method, the industrial microcrystalline plate is prepared from the following raw material components in percentage by mass: 62-70% of graphite tailings, 6-10% of quartz sand, 6.0-7.0% of sodium carbonate, 5-7% of limestone, 2-2.8% of dolomite, 3-4% of sodium fluosilicate, 1.5-2% of sodium nitrate and 0.1-0.2% of cerium oxide. By analyzing the components of the graphite tailings and adopting a specific formula combination, the graphite tailings are manufactured into the microcrystalline plate with excellent industrial wear resistance and corrosion resistance, so that the problems that the microcrystalline plate manufactured by the existing formula is poor in wear resistance and poor in corrosion resistance are solved. The wear-resistant lining is not applicable to gangue bins, coal storage bunkers, dumper rooms and coal preparation plant equipment in the coal industry.

The invention belongs to the technical field of wastewater treatment, and relates to a treatment method of ardealite leachate, which comprises the following steps: (1) discharging the ardealite leachate into a primary reaction tank, adding lime into the ardealite leachate in the primary reaction tank, stirring for reaction, and controlling the pH value to 9.8-10.0; (2) enabling effluent of the first-stage reaction tank to enter a second-stage reaction tank, adding a magnesium agent into the second-stage reaction tank, and stirring for reaction; (3) carrying out solid-liquid separation on effluent of the secondary reaction tank, and recycling obtained mud cakes as phosphorus and fluorine resources; (4) enabling the solid-liquid separation filtrate obtained in the step (3) to enter a third-stage reaction tank, adding sodium carbonate or NaOH into the third-stage reaction tank, stirring to remove hardness, and enabling effluent to enter a first-stage sedimentation tank to remove hardness and Fe; (5) enabling supernate of the primary sedimentation tank to enter a fourth-stage reaction tank, adding acid into the fourth-stage reaction tank, adjusting the pH value, and enabling effluent to enter a secondary sedimentation tank; and (6) enabling effluent of the secondary sedimentation tank to sequentially pass through a filtering device, an ultrafiltration device and a reverse osmosis device, and recycling reverse osmosis produced water as desalted water.

The invention discloses a method for preparing vanadium pentoxide from vanadium slag and vanadium pentoxide. The method comprises the following steps that the vanadium slag is subjected to roasting, clinker leaching and purification in sequence, and purified liquid is obtained; extracting the purified liquid by using a CO3 < 2-> and / or HCO3 <-> type extraction agent to obtain a vanadium-containing organic phase; the vanadium-containing organic phase is subjected to reverse extraction through a reverse extraction agent, and vanadium-containing reverse extraction liquid is obtained; adding ammonium salt into the vanadium-containing strip liquor, cooling and precipitating to obtain ammonium metavanadate; and calcining the ammonium metavanadate to obtain vanadium pentoxide. According to the scheme, the purification liquid is separated in an extraction mode to obtain the vanadium-containing organic phase, meanwhile, the vanadium-containing organic phase is subjected to reverse extraction of vanadium through the mixed solution of the sodium carbonate, the ammonium carbonate and the ammonia water, the stability of the vanadium-containing reverse extraction liquid is improved through introduction of the sodium carbonate, and the problem that when the vanadium is subjected to reverse extraction through the mixed solution of the ammonium salt and the ammonia water is solved. The problems of device wall scabbing, pipeline blockage and the like caused by crystallization and separation of ammonium metavanadate are solved.

The present application belongs to the field of oilfield drilling fluid, and discloses a multifunctional polymer drilling fluid mud cake modifier, a preparation method and application thereof, wherein the mud cake modifier comprises, by mass fraction, 5-95% of acicular wollastonite powder, 1-20% of sodium gluconate and 1-10% of instant sodium carbonate; the mud cake modifier is directly added into drilling fluid during use, and the addition amount is 0.5-1.5% by mass fraction. The mud cake modifier can improve the hardness, compactness and toughness of the mud cake, and improve the properties of the mud cake on the well wall; the mud cake modifier can form a thin, hard, tough and compact mud cake on the well wall, reduce the filtration loss of the drilling fluid, improve the rheological property of the drilling fluid, has no obvious influence on the density and viscosity of the drilling fluid, and has the dual functions of enhancing the affinity between the cement sheath and the mud cake and stabilizing the well wall.

The embodiment of the invention provides a preparation method of a heat storage material based on microbial corrosion and energy field regulation and a material. The method comprises the following steps: mixing distilled water, magnesium chloride, sodium carbonate and sodium hydroxide to prepare slurry; the method comprises the following steps: selecting silicophilic bacillus licheniformis as a silicate rock degradation strain, and inoculating the silicophilic bacillus licheniformis into a culture medium containing silicate rock chips for culturing; adding the obtained silicophilic bacillus licheniformis culture solution into a solution containing silicate rock debris to obtain activated silicate rock debris; mixing the activated silicate rock debris with a binder to prepare a green body, so as to obtain a pre-oxidized active material; putting the magnesium oxide active powder into a high-vacuum hot-pressing furnace, and synthesizing nano whiskers; calcining the obtained nano crystal whiskers to obtain core material nano crystal whiskers, mixing the core material nano crystal whiskers with a binder, and performing granulation, drying and compression molding to obtain a biscuit; putting the biscuit into a tubular furnace, and carrying out heating and heat preservation treatment; putting the cooled biscuit into a graphite mold, and sintering to obtain a biscuit; the biscuit is treated through an impregnation method, and the heat storage material is prepared.

The invention relates to the technical field of saline-alkali ore development, and discloses a method for processing alkali and ammonium chloride from saline-alkali ore in a short process. The method comprises the following steps: filtering saline-alkali brine extracted from saline-alkali ores, reacting with carbon dioxide to generate sodium bicarbonate, crystallizing and separating out the sodium bicarbonate to form baking soda slurry, carrying out solid-liquid preliminary separation on the baking soda slurry, washing a separated baking soda wet filter cake with water, and calcining; sodium carbonate generated by decomposition is cooled and sieved, and the sieved lower-layer product is a qualified sodium carbonate product; ammonium bicarbonate and sodium chloride are subjected to a double decomposition reaction, ammonium chloride and sodium bicarbonate crystals are generated, ammonium chloride mother liquor obtained after sodium bicarbonate is separated is pumped to a rotary precipitation machine, sodium chloride powder is added, ammonium chloride crystals are separated out, ammonium chloride slurry is formed, the separated ammonium chloride crystals are dried, screened and packaged, and qualified ammonium chloride products are produced. According to the method, all salt and alkali with economic value in the salt and alkali brine are processed and utilized, and benefit development of the high-salt-content trona ore is achieved.

The utility model belongs to the field of water treatment, and particularly relates to a wastewater hardness removal system for nanofiltration coupling induced crystallization. The wastewater hardness removal system comprises a nanofiltration unit, a gypsum reactor and an ettringite reactor. Wherein the nanofiltration unit is configured to add a scale inhibitor into the wastewater, so that calcium ions and sulfate ions are supersaturated, and divalent salt is intercepted, so that the divalent salt is enriched on a nanofiltration concentrated water side; the gypsum reactor is communicated with a nanofiltration concentrated water liquid outlet of the nanofiltration unit and is configured to add an agent for destroying a scale inhibitor, so that calcium ions and sulfate ions are combined to produce calcium sulfate crystals; the ettringite reactor is communicated with the liquid outlet of the gypsum reactor, and is configured to add alkali and aluminum salt, further remove hardness of the liquid discharged from the gypsum reactor, and produce ettringite. Therefore, the consumption of the chemical agent is low, the subsequently added sodium carbonate can be reduced, meanwhile, the increase of ion concentration caused by adding the chemical softening agent is reduced, and the treatment pressure of a subsequent water treatment system is reduced.

The invention provides a surfacing electrode for repairing a hot forging die and a preparation method thereof, and relates to the technical field of welding materials. The surfacing welding rod for repairing the hot forging die comprises a welding core and a coating wrapping the welding core, and the coating comprises, by mass, 20%-24% of marble, 15%-17% of fluorite, 4%-6% of silicon iron, 2%-3% of electrolytic manganese metal, 2%-3% of titanium dioxide, 13%-16% of chromium metal, 0.5%-1% of sodium carbonate, 4%-6% of molybdenum powder and 26%-28% of cobalt powder. When the surfacing electrode is used for repairing a hot forging die, surfacing metal has good wear resistance, impact resistance and fatigue resistance, and the service life of the die can be effectively prolonged.

The invention discloses a molybdenum alloy total molybdenum content detection method based on a lead molybdate gravimetric method. The method comprises the following steps: dissolving a ferromolybdenum alloy sample through a nitric acid-potassium chlorate saturated solution and the like, carrying out lead molybdate precipitation through ammonia water, an acetic acid-ammonium acetate buffer solution, lead acetate and the like, carrying out high-temperature gradient sintering on filter residues through a mixed solvent of anhydrous sodium carbonate and zinc oxide, and determining residual molybdenum through a potassium thiocyanate spectrophotometric method after dissolving. And performing correction calculation. According to the method, a gravimetric method and a spectrophotometric method are combined for use, the filter residues are corrected, the precipitation process technology is optimized, the problems that a traditional method is tedious in operation and large in residual molybdenum error of the filter residues are solved, and high-precision, high-efficiency and low-cost molybdenum content detection is achieved.

The invention discloses a method for preparing sodium carbonate from industrial solid waste mirabilite, which comprises the following steps: uniformly mixing mirabilite, slag and a reducing agent according to a certain proportion, adding water, carrying out wet mixing, carrying out compression molding, drying water in a sample, and carrying out reduction reaction in a reduction furnace to obtain a slag-containing sodium sulfide block material; and after crushing, the slag-containing sodium sulfide powder is placed in the atmosphere of carbon dioxide and water vapor to react to obtain slag-containing sodium carbonate which can be directly used for chromium salt production or vanadium extraction process. The method is simple in technological process, high in mirabilite reduction rate, energy-saving and consumption-reducing, free of wastewater and waste residue discharge in the whole production process and capable of meeting the environmental protection requirement.