351 results about "Sodium carbonate" patented technology

The invention belongs to the technical field of enamel glaze preparation, and particularly relates to a high-temperature-resistant compact enamel glaze preparation method, which comprises: 1, enamel frit preparation: mixing 45-65% by mass of silicon dioxide, 10-15% by mass of anhydrous borax, 5-10% by mass of sodium carbonate, 2-6% by mass of lithium carbonate, 2-6% by mass of calcium carbonate, 2-6% by mass of strontium carbonate, and 3-6% by mass of ice crystal to form a batch, melting at 1300 DEG C for 2-3 hours, carrying out water quenching to prepare an enamel material, drying, and sieving with a 200-mesh sieve to obtain enamel frit powder; step 2, preparing enamel glaze slip, namely mixing and ball-milling 40-55% of enamel frit powder, 15-30% of 316 # stainless steel powder, 5.5-10% of clay suspending agent and 25-50% of water in percentage by mass to obtain the enamel glaze slip; and step 3, enamel coating and firing. The enamel coating has excellent high temperature resistance and corrosion resistance and long service life, and the preparation process is simple in requirement, simple and convenient to operate and suitable for industrial production.

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 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 technological method for extracting lithium, rubidium and cesium through a lepidolite chlorate method. The technological method comprises the steps that lepidolite, calcium chloride, sodium chloride and calcium oxide are mixed and then roasted, and clinker is obtained; leaching the clinker under an acidic condition to obtain brine; performing impurity removal treatment on the brine to obtain purified clear liquid; performing lithium precipitation on the purified clear liquid through sodium carbonate liquid; the method comprises the following steps: extracting filtered waste liquid subjected to lithium precipitation through an extracting agent and a dispersing agent, washing a rubidium and cesium oil phase obtained by extraction by adopting two-section multi-stage cross flow of different detergents to obtain an organic phase, and carrying out reverse extraction on the obtained organic phase to reversely extract rubidium and cesium into reverse water; and preparing salt from the reverse water in an evaporation drying manner. According to the method, after the lepidolite is subjected to roasting transformation leaching, the leaching rate of lithium can reach 94% or above, the leaching rates of rubidium and cesium can reach 98% or above, the process of extracting lithium, rubidium and cesium from the lepidolite to prepare corresponding salt products is environmentally friendly, energy-saving, low in energy consumption, low in cost and high in extraction rate, and wide industrial application prospects are achieved.

The invention belongs to the technical field of environmental rock soil, and particularly relates to a preparation method of zeolite-magnetic iron oxide and application of the zeolite-magnetic iron oxide in catalyzing sodium percarbonate to repair petroleum hydrocarbon polluted soil. The specific method comprises the following steps: carrying out alkali treatment on zeolite, and then carrying out heat treatment to obtain alkali-heat combined modified zeolite; extracting an iron element in the iron-containing by-product with acid and preparing ferric hydroxide colloid; and uniformly mixing the alkali-heat combined modified zeolite with the ferric hydroxide colloid, carrying out solid-liquid separation, and then carrying out heat treatment and hydrogen reduction treatment to obtain the zeolite-magnetic iron oxide, the application specifically comprises the following steps: uniformly mixing sodium percarbonate, tween-80, silica sol and water to prepare a turbid solution A; uniformly mixing zeolite-magnetic iron oxide, organic acid, silica sol and water to prepare a turbid solution B; and uniformly mixing the turbid liquid B with the petroleum hydrocarbon polluted soil, then adding the turbid liquid A, uniformly mixing, and maintaining for 12-15 days to finish the remediation.

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 present invention belongs to the technical field of high-purity quartz processing and discloses a method for removing impurities from quartz inclusions by hydrothermal denudation combined with acid leaching. Gas-liquid inclusions on the surface of quartz sand are destroyed by hydrothermal reaction of quartz sand and calcium oxide, and xonotlite produced by the reaction is removed with dilute nitric acid and sodium carbonate solution; and then impurities dissolved in acid and excess acid solution are removed by acid leaching, cleaning and filtering to obtain pure quartz sand. The technology destroys the gas-liquid inclusions by the hydrothermal method and avoids the use of hydrofluoric acid in the acid leaching process, which can effectively reduce the environmental pollution caused by the acid leaching process, exhibiting excellent industrial application potential.

The utility model relates to the technical field of feeding devices, in particular to an intelligent sodium carbonate and acetic acid proportioning and feeding device, which comprises a feeding platform and is characterized in that a sodium carbonate feeding device is arranged on one side of the feeding platform, a sodium acetate feeding device is arranged on the other side of the feeding platform, and the sodium carbonate feeding device and the sodium acetate feeding device respectively comprise a stock bin. A feeding pipe is arranged in the center of the top of the stock bin, a filtering assembly is arranged on the top of the feeding pipe, a metering valve is arranged at the junction of one side of the bottom of the feeding pipe and the stock bin, a monitoring sensor is arranged on one side of the stock bin, the bottom of the stock bin is connected with a mixing assembly, and the bottom of the mixing assembly is connected with a reaction kettle. High efficiency and automation are achieved, the complexity of manual operation is reduced, and the production efficiency is improved; the proportioning is accurate: through the associated cooperation of a high-precision metering valve, a monitoring sensor and a control box, the adding amount and the proportioning of sodium carbonate and acetic acid can be accurately controlled, and the stability of the product quality is ensured; the operation is simple.

The invention belongs to the technical field of crystallizer casting powder, and provides crystallizer casting powder for medium carbon steel and a preparation method of the crystallizer casting powder. The crystallizer casting powder comprises the following raw materials: 20-40 parts of wollastonite, 20-40 parts of magnesium slag, 2-6 parts of quartz, 1-5 parts of bentonite, 2-6 parts of flint clay, 3-10 parts of fluorite, 1-3 parts of sodium carbonate, 1-2 parts of manganese carbonate, 3-7 parts of boron glass powder, 2-4 parts of magnesia powder, 6-10 parts of a carbon material and 2-4 parts of a modified binder. The crystallizer casting powder disclosed by the invention is reasonable in proportion of chemical components, has proper melting speed and viscosity, effectively ensures the thickness of a liquid slag layer, and can be uniformly consumed, so that the continuous casting process is ensured to be carried out smoothly, and the quality defects of corner cracks, narrow edge bulging, corner transverse cracks and the like of a medium carbon steel casting blank are avoided.

The underwater anti-dispersion additive is prepared from the following components in parts by weight: 30 to 50 parts of a water-resistant dispersing agent, 20 to 25 parts of a water reducing agent, 20 to 25 parts of a suspending agent, 5 to 10 parts of a plastic expanding agent, 25 to 30 parts of a coagulating agent, 40 to 60 parts of sodium carbonate and 25 to 30 parts of a de-foaming agent. The grouting material is composed of the following components in parts by weight: 1000 parts of PO425 ordinary Portland cement, 5-10 parts of an underwater anti-dispersion additive and 400 parts of water. The prepared anti-dispersion cement-based grouting material has the advantages of early strength, no shrinkage, slight expansion, impermeability and high durability, is suitable for the field of underground buildings, and has a wide application prospect.

The invention discloses a coal-fired power plant flue gas carbon capture and ammonium fertilizer co-production system and method based on an ammonia process, desulfurized flue gas sequentially passes through a saturation area, an absorption area and an ammonia washing area of a decarburization system, passes through a first-stage ammonia washing spraying layer and a second-stage ammonia washing spraying layer, and finally, purified flue gas is discharged to the atmosphere. After sodium hydroxide, sodium carbonate and a flocculating agent are added into desulfurization wastewater, obtained clear liquid is pumped into a first-stage ammonia washing spraying layer through a clear liquid conveying pump to spray and absorb escape ammonia gas, enters an absorption area slurry box after the pH value reaches the upper limit, and enters a saturation area after the pH value of the absorption area slurry box reaches the upper limit; slurry in the saturation area is subjected to solid-liquid separation through a cyclone and a centrifugal machine, and clear liquid returns to the saturation area again. And the slurry in the saturation area is separated twice by a cyclone and a centrifugal machine to obtain solid ammonium bicarbonate. According to the invention, part of desulfurization wastewater and carbon dioxide in desulfurized flue gas can be cooperatively treated, and the produced ammonium bicarbonate fertilizer can be used for producing ammonium fertilizer or compound fertilizer, and has high economic value.

The utility model relates to the technical field of sodium carbonate, in particular to an environment-friendly sodium carbonate drying device which comprises a crushing mechanism, the crushing mechanism comprises a feeding shell, a conveying motor is installed on one side of the feeding shell in a matched mode, a feeding roller is fixedly installed at the output end of the conveying motor, and two extrusion plates move relatively to conduct crushing treatment. Under the action of the distribution plate, the crushed and accumulated sodium carbonate is pushed aside, at the moment, operation of the telescopic cylinder is controlled, the telescopic cylinder drives the sliding rod to move in the U-shaped frame, the sliding rod drives the connecting block to move, the connecting block drives the equal division scraping plate to move, and the sodium carbonate pushed aside by the distribution plate is subjected to equal division treatment again; according to the soda ash drying device, the thickness needed by soda ash drying can be adjusted, the soda ash can be heated more evenly, under the action of the crushing mechanism, large blocks of soda ash can be crushed, the soda ash can be heated evenly in the drying process, and the working efficiency is improved.

The invention provides drilling fluid for a well wall of a fracture zone as well as a preparation method and application of the drilling fluid. The drilling fluid comprises water, bentonite, a filtrate reducer, an inhibitor, an anti-collapse agent, sodium carbonate, caustic soda, a dispersing agent and a weighting agent, the preparation method comprises the following steps: pre-hydrating the bentonite, and uniformly mixing the pre-hydrated bentonite with the filtrate reducer, the inhibitor, the anti-collapse agent, the caustic soda, the dispersing agent and the weighting agent to obtain the drilling fluid. The drilling fluid disclosed by the invention can be applied to drilling of fracture zone fractured formations of ultra-deep wells and extra-deep wells along north, can resist high temperature of 160 DEG C, can keep good rheological property in a high-density state of 1.6-2.0 g / cm < 3 >, can effectively carry rocks and quickly block formation micro-pores around wells at the same time, and can keep the stability of well walls to the greatest extent.

The invention discloses a preparation method of a soil remediation agent based on zinc slag-Zn-MOF.The preparation method comprises the steps that firstly, solid waste zinc slag is adopted for preparing zinc slag Zn-MOF, then the zinc slag Zn-MOF serves as a carrier, sodium percarbonate and acid-containing ferrous sulfate are loaded on the zinc slag Zn-MOF, finally, the zinc slag Zn-MOF loaded with the sodium percarbonate and the zinc slag Zn-MOF loaded with the acid-containing ferrous sulfate are mixed according to the mass ratio of 1: (1-7), and the soil remediation agent is obtained. The soil remediation agent is obtained. Compared with the soil remediation agent in the prior art, the solid waste zinc slag is adopted as the main preparation raw material of the carrier material, resource utilization of the solid waste is achieved, waste can be turned into wealth, the waste treatment cost can be reduced, and the environmental pressure can be relieved; the prepared soil remediation agent has the efficient adsorption capacity of MOF and the strong oxidation performance of sodium percarbonate, and has a good remediation effect on organic contaminated soil.

Provided is a method for recovering valuable metals from a positive electrode of waste lithium iron phosphate. The method includes: subjecting a waste lithium iron phosphate battery to discharging and disassembly; subjecting a lithium iron phosphate positive plate obtained by the disassembly to breaking, followed by high temperature treatment; uniformly mixing a product obtained by the high temperature treatment with a carbon material, and roasting a mixture in a high-purity Cl2 atmosphere; subjecting a gas phase product obtained by the roasting to fractional quenching and condensation to recover ferric chloride and aluminum chloride separately; and subjecting a solid phase product obtained by the roasting to water leaching and filtration to obtain a lithium chloride aqueous solution, and then adding sodium carbonate to precipitate lithium carbonate. As a one-step carbothermal chlorination method is adopted in combination with a two-stage quenching and condensation process in the present invention, the use of acidic solutions during recovery of valuable metals from the lithium iron phosphate positive electrode can be avoided, and the use of large amounts of alkaline solutions or extraction agents to separate and recover chlorides step by step is also not required. The method of the present invention has the advantages of a high metal recovery rate, a low comprehensive cost and good economic benefits, social benefits and environmental protection benefits.

The invention relates to the technical field of welding rod preparation, and discloses a steel matched welding rod for a high water head of a pumped storage power station and a production method of the steel matched welding rod. The coating is prepared from the following components in parts by weight: 25.0 to 36.0 parts of calcite, 26.0 to 35.0 parts of calcined fluorite, 3.0 to 6.7 parts of calcined natural rutile, 3.0 to 7.0 parts of quartz sand, 2.5 to 4.0 parts of spray silicon iron, 5.5 to 7.6 parts of nickel powder, 0.5 to 0.8 part of sodium carbonate, 0.3 to 0.6 part of CMC (Carboxymethyl Cellulose), 0.6 to 1.0 part of sodium alginate, 5.0 to 6.3 parts of low-carbon ferromanganese, 9.0 to 11.0 parts of atomized iron powder, 1.8 to 2.6 parts of ferrotitanium, 0.6 to 1.0 part of rare earth fluoride and 0.6 to 1.0 part of zirconium dioxide; the production method comprises the following steps: uniformly mixing the raw materials of the coating according to the ratio, adding the adhesive into the mixture, and uniformly mixing; and the mixture and the core wire are added into a plodder, the coating is prepared on the surface of the core wire, then low-temperature baking and high-temperature baking are conducted, and the welding rod is obtained.

The invention discloses a high-salt-content wastewater crystal. The high-salt-content wastewater crystallization comprises the following steps: S1, pretreatment: wastewater in a system enters a homogeneous regulation tank in S1, water is discharged from the homogeneous regulation tank to a high-density tank 1 #, PAC, PAM, lime sodium carbonate and NaOH are added into the high-density tank 1 # for reaction, water is discharged from the high-density tank 1 # to a high-density tank 2 #, PAC, PAM and sodium metaaluminate are added into the high-density tank 2 #, water is discharged from the high-density tank 2 # to a high-strength membrane tank, and water is discharged from the high-strength membrane tank to a two-stage weak acid cation bed; s2, evaporative crystallization: the concentrated water in the concentrated water feeding tank enters a triple-effect mixed salt evaporative crystallization device to separate out mixed salt of sodium chloride and sodium sulfate and part of carnallite. The high-salt-content wastewater crystal provided by the invention can achieve the purposes of salt separation and zero discharge, and recycling and reusing of produced water and saltpeter, and also realizes recycling of produced reclaimed water and resource reutilization of produced sodium sulfate and sodium chloride as industrial raw materials.

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 utility model relates to a waste heat utilization device of a sodium carbonate production system in the technical field of waste heat recovery in the sodium carbonate industry. According to the cleaning device, the motor is arranged and drives the first full gear and the second full gear to rotate, then the first half gear and the second half gear are driven to rotate, the rack is driven to move, the cleaning roller is driven to horizontally move in a reciprocating mode, the heat exchange metal pipe is cleaned, scale on the surface of the heat exchange metal pipe can be removed, the surface is kept clean, and corrosion and abrasion are prevented; and the waste heat recovery efficiency is improved, and the cleaning and maintenance time and money cost are reduced. And the water storage tank is arranged, heat energy can be stored, heat output can be balanced and stabilized, it is ensured that heat cannot be wasted, and the waste heat recovery efficiency is improved. A large amount of low-temperature waste heat of a sodium carbonate production system is used for heating calcium chloride raw material liquid, finished calcium chloride is prepared through sodium filtration, evaporation and crystallization, the quality and yield of the calcium chloride product are improved, the salt content of the calcium chloride finished product is reduced, and meanwhile steam consumption in the calcium chloride production process is reduced.

The invention discloses an application of a thiourea modified charcoal adsorbent in adsorption of ciprofloxacin. The preparation method comprises the following steps: grinding and uniformly mixing rice straw powder, thiourea and sodium carbonate, pyrolyzing in inert gas, cooling, grinding and sieving to obtain a biochar material; and washing, carrying out suction filtration and drying to obtain the thiourea modified charcoal adsorbent. The thiourea modified biochar adsorbent is used for carrying out an adsorption experiment on 50 mg / L of CIP, the maximum adsorption capacity of the thiourea modified biochar adsorbent on the CIP is 444.8 mg / g after 60 minutes, the removal rate of the CIP reaches 99.7% when adsorption is balanced, excellent adsorption performance is shown, and the thiourea modified biochar adsorbent can be used as a good adsorbent for controlling ciprofloxacin pollution.

The invention discloses pipe jacking thixotropic slurry as well as a preparation method and application thereof, and belongs to the technical field of pipe jacking engineering. The thixotropic slurry for the pipe jacking is prepared from the following raw materials in percentage by mass: 6 to 10 percent of bentonite, 0.2 to 1.2 percent of sodium carbonate, 0.3 to 0.7 percent of sodium carboxymethyl cellulose, 1 to 3 percent of fly ash microbeads, 0.5 to 1.5 percent of potassium humate, 0.4 to 0.8 percent of glass fibers and the balance of water. The fly ash microbead component can fill soil particle gaps in bad stratums such as a sand layer and a pebble bed and reduce the side friction resistance during pipe jacking construction, the glass fibers can be three-dimensionally distributed in the slurry to form a glass fiber network to improve the supporting strength of the slurry, and the potassium humate does not increase the water loss rate of the thixotropic slurry and also can improve the water loss rate of the thixotropic slurry. The apparent viscosity of the slurry can be reduced, so that the slurry is better pumped, and the stability of the slurry structure is enhanced.

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 invention belongs to the technical field of preparation of semiconductor gas-sensitive materials, and particularly relates to an in-situ preparation method of a modified graphene quantum dot / ZnO gas-sensitive material. The preparation method comprises the following steps: by taking an Al2O3 gas-sensitive ceramic tube pretreated by alkali liquor as a substrate, loading a ZnO seed crystal on the gas-sensitive ceramic tube, and then carrying out hydrothermal reaction by taking the Al2O3 gas-sensitive ceramic tube loaded with the ZnO seed crystal as the substrate and taking zinc chloride, sodium carbonate and graphene quantum dots as main raw materials, thereby obtaining the graphene quantum dot / ZnO gas-sensitive material. And modifying the graphene quantum dot / ZnO gas-sensitive material by using ammonia water through a solvothermal method. Compared with a pure ZnO gas-sensitive element, the modified graphene quantum dot / ZnO gas-sensitive element has the advantages that the optimal working temperature is reduced by about 170 DEG C, the sensitivity is obviously improved, the modified graphene quantum dot / ZnO gas-sensitive element shows excellent selectivity to ethanol in ethanol, acetone, benzene, ammonia gas and methanol gas atmospheres, and the response recovery time is also greatly shortened.

The invention provides a composite steel core ferronickel welding rod and a preparation method thereof, and particularly relates to the technical field of welding materials. The composite steel core ferronickel welding rod comprises a welding core, a steel belt and a coating, the welding core is wrapped with the steel belt, the steel belt is wrapped with the coating, and the coating comprises, by weight, 32-40 parts of marble, 18-23 parts of fluorite, 10-15 parts of barium carbonate, 5-10 parts of iron powder, 4-7 parts of graphite, 3-10 parts of nickel powder, 1-3 parts of manganese metal, 3-5 parts of atomized ferrosilicon, 2-4 parts of feldspar, 0.5-1 part of sodium carbonate, 0.3-0.5 part of CMC and 0.3-0.8 part of microcrystalline cellulose. The welding core comprises the following components in percentage by mass: more than or equal to 99 wt% of nickel and the balance of inevitable impurities. The welding rod is free of the problems of redness, heating, coating cracking and falling during welding, high-efficiency welding with ultra-large current can be achieved, and waste is reduced.

The utility model provides a sodium carbonate dissolving device which comprises a barrel body, a water inlet and a feed port are arranged on a top cover of the barrel body, a horizontally arranged partition plate is arranged inside the barrel body and divides the inside of the barrel body into an upper chamber and a lower chamber, a plurality of vertically through communicating holes are arranged on the partition plate, a liquid outlet is arranged on the side wall of the lower chamber, and the liquid outlet is communicated with the upper chamber and the lower chamber. The sodium carbonate dissolving device further comprises a stirring unit, the stirring unit comprises a motor and a stirring shaft, and an upper cavity stirring blade and a lower cavity stirring blade are arranged on the stirring shaft in the upper cavity and the stirring shaft in the lower cavity respectively. The device can realize three-dimensional circulating flow of the solution and improve the dissolving efficiency, so that the number of sodium carbonate dissolving devices is reduced, and the equipment cost is reduced; alkali blocks entering the pipeline can be reduced, pipeline blockage is prevented, and the production working condition is stabilized.