237 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 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 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.

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 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 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 a solid-waste-based mine filling material as well as a preparation method and a use method thereof, and relates to the field of mine filling. The solid waste-based mine filling material comprises the following components in percentage by weight: 20-50% of tailings, 10-30% of slag, 10-30% of modified fly ash, 5-15% of phosphogypsum, 5-10% of sodium carbonate, 5-10% of cement and 1-10% of a foaming agent. Wherein a copolymer of PVA, polyacrylate or vinyl acetate and acrylate is formed on the surface of the modified fly ash. By implementing the method disclosed by the invention, bleeding of the solid-waste-based mine filling material can be greatly reduced, free adjustment of the density of the solid-waste-based mine filling material can be realized, and the consumption of cement and other components is reduced. Meanwhile, the dry shrinkage resistance and the freezing and thawing resistance of a filling body formed by the solid waste-based mine filling material are also improved.

The utility model discloses a cooling device for high-temperature sodium carbonate powder, which comprises a cooling box, a heat exchange pipeline obliquely penetrating through the cooling box is arranged in the middle section of the cooling box, and high-temperature sodium carbonate passes through the heat exchange pipeline; the multiple heat exchange pipelines are vertically arranged, the lower end of the heat exchange pipeline on the upper layer is connected with the high end of the adjacent heat exchange pipeline on the lower layer through a transfer conveying mechanism, the high end of the heat exchange pipeline on the uppermost layer is connected with a feeding conveying mechanism, and the lower end of the heat exchange pipeline on the lowermost layer is connected with a discharging conveying mechanism. A spraying mechanism is arranged above the heat exchange pipeline on the uppermost layer, water passing holes are formed in the portions, located in the cooling box, of the heat exchange pipelines, and a water storage pool is formed in the bottom of the cooling box. On the premise that the heat exchange efficiency and sufficient cooling are guaranteed, the size of equipment is reduced.

The invention belongs to the technical field of non-ferrous metallurgy, and particularly discloses a method for removing copper from bismuth oxide ore through rough smelting of bismuth sulfide ore, which comprises the following steps of: proportioning the bismuth oxide ore, sodium carbonate and pulverized coal to obtain a rough smelting material, smelting the proportioned rough smelting material, adding the bismuth sulfide ore in batches from a feeding port after the rough smelting material is completely melted and reacted, and smelting the bismuth sulfide ore in batches to remove copper from the bismuth sulfide ore. The slag rake is immediately used for stirring for 3-15 minutes after the bismuth sulfide ore is added every time, the copper content in a reactant is detected after stirring is completed, and when the copper content in the reactant is smaller than 0.5%, discharging operation is conducted to obtain slag and crude bismuth, in this way, no new impurities are introduced during crude smelting of the bismuth oxide ore, the copper content of the produced crude bismuth is low, the bismuth content of the slag is low, and the direct recovery rate of the bismuth is high. Compared with a copper removal and slag making process by adding fluorite, silica, pyrite and other high-melting-point reagents, the method has the characteristics that furnace knotting is not easy to form, and the furnace condition is stable.

The invention belongs to the technical field of mineral product processing, and discloses a method for producing crude oil and sodium carbonate from oil-alkali paragenic ore. Comprising the steps of three-phase separation, dehydration, sedimentation, cyclone separation, filtration and purification. After being treated by the treatment method disclosed by the invention, the produced petroleum and sodium carbonate both meet the quality index requirements.

The present application discloses a method for producing sodium carbonate and high-strength gypsum by using calcium carbonate and sodium sulfate as raw materials. In the present application, two low-value-added salts, sodium sulfate and calcium carbonate, are used as raw materials, and are combined with an ammonia cycle to produce a high-value-added product, i.e., sodium bicarbonate or sodium carbonate, and high-strength gypsum; by means of a calcium-oxide-based deamination unit, full cycling of an ammonia raw material in a production process is realized; and by producing the high-strength gypsum, the economic efficiency of the process is improved. The method provided in the present application has the advantages of a simple process, stable operation, low investment and low production costs.

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.