43results about How to "Moderate alkalinity" patented technology

Disclosed is a smelting reduction iron making method by iron ore hot pressing carbon bearing lump into shaft furnace, which takes iron concentrate hot pressing carbon bearing lump as raw material and shaft furnace as smelting reduction reactor. Smelting reduction iron is done by injecting pulverized coal into the shaft furnace with industrial oxygen, hot air or high oxygen hot air agitated; the iron bearing power of iron concentrate hot pressing carbon bearing lump is iron concentrate powder; the hot pressing pulverized coal is bituminous coal powder; quicklime acts as flux; the weight percent of each group is as follow: iron concentrate powder 60 to 75 percent, bituminous coal powder 20 to 35 percent and the quicklime powder 20 to 35 percent; iron concentrate pulverized coal hot pressing lump is fed through double bell mix feeding system at the top of the shaft furnace and is preheated, reduced and smelted in the shaft furnace; the pulverized coal is injected from a tuyere of the shaft furnace to supply heat for the reduction and smelting of iron concentrate hot pressing carbon bearing lump. The process is fit for iron making condition of our country with strong adaptability raw material and low energy and oxygen consumption per ton of iron, which does not depend on coke , and is environment-friendly with short flow and low cost.

The invention relates to a desulfurization gypsum basic steel slag composite gelled material and a preparation method thereof. The desulfurization gypsum basic steel slag composite gelled material comprises the following raw materials by weight percentage: 65-95 of desulfurization gypsum, 5-35 of steel slag and an exciting agent of 0.1-5 of the total weight of the desulfurization gypsum and the steel slag, wherein the summation of the weight percentages of the desulfurization gypsum and the steel slag is 100 percent. The preparation method of the composite gelled material comprises the following steps: sifting the steel slag and the desulfurization gypsum for filtering out large grains and pouring the steel slag and the desulfurization gypsum into a material mixing pot for mixing for 20-30 minutes; gauging a standard consistency water consumption of water and pouring the water into an agitator kettle for standby; then weighing the exciting agent, adding the exciting agent to the mixture of the desulfurization gypsum and the steel slag by a first mixing method or a simultaneous mixing method and uniformly mixing the mixture; and agitating, molding and maintaining the mixed materials to obtain the composite gelled material. The method combines two industrial wastes so as to sufficiently improve the utilization rate of the steel slag and the desulfurization gypsum, change the wastes into valuables and also form the gypsum material with good heat preservation, heat insulation and sound insulation performance.

This invention provides ladle top-slag used for vacuum decarbonization and refinery in vacuum tank. The ladle top-slag comprises: CaO 30-45 wt.%, SiO2 12-18 wt.%, Al2O3 25-35 wt.%, FeO 5-15 wt.%, MgO 3-8 wt.%, and H2O 0-0.2 wt.%. This ladle top-slag is granular mixture with granule sizes of 3-10 mm. The ladle top-slag can transfer oxygen from to steel melt, promote vacuum decarbonization without air, effectively inhibit residue overflow during decarbonization, improve the adsorption of lards in the steel melt after decarbonization, and promote desulfurization and deoxidization of the steel melt.

The invention relates to a covering powder material, in particular to an anti-bonding bleed-out continuous casting covering slag. The components of the anti-bonding bleed-out continuous casting covering slag in weight percent are as follow: 2-8% of Al2O3, 2-7% of F, 4-8% of Na2O, less than 4% of Li2O, 2-15% of B2O3, 0.7-3% of C, less than 3% of impurities carried in by raw materials, and balance of CaO and SiO2 with the weight ratio of CaO / SiO2 being 0.5-0.8. The properties of the covering slag are as follows: solidification temperature is less then 980 DEG C, viscosity at 1300 DEG C is 0.2-0.5Pa.s, and no crystal is precipitated during solidification. The usabilities of the covering slag are as follows: consumption rate is larger than or equal to 0.4kg / t steel, and the thickness of melt slag layer is 10-16mm. The anti-bonding bleed-out continuous casting covering slag in the invention can prevent the phenomenon of bonding bleed-out, improve operation rate of continuous casting machine, and reduce cost and accidents.

The invention relates to low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag, and belongs to the technical field of metal smelting accessories. The low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag is prepared from, by weight, 33.5-38.25 parts of CaO, 25.4-29.6 parts of SiO2, 3-6 parts of Al2O3, larger than 0 and smaller than or equal to 4 parts of Fe2O3, 2-5 parts of MgO, 3.5-9.5 parts of Na2O, 4.5-8.5 parts of F and 3-7 parts of C. The covering slag has the appropriate alkalinity, smelting point, viscosity and carbon addition, suitable heat transfer ability and good filling performance, and can well adapt to characteristics of low-nickel high-nitrogen austenitic stainless steel continuous casting.

The invention provides a ladle covering agent prepared through utilizing blast furnace slag. The ladle covering agent is composed of 30-40 parts by weight of blast furnace slag, 26.7-40 parts by weight of limestone, 15-20 parts by weight of vermiculite and 5-15 parts by weight of fluorite, wherein the total weight part of the above raw materials is 100. The main raw materials of the ladle covering agent have the advantages of low cost, suitable melting point, short fusing time and good spreadability; and limestone decomposes at 800-1200DEG C, foams and expands, vermiculite expands at a high temperature, and the friction force among solid particles is lower than the inner friction force among powders, so the spreadability and the heat insulating property are good. The ladle covering agent can prevent the secondary oxidation and too large temperature decrease of molten steel, and has a certain impurity adsorption and inclusion capability to purify the molten steel because of the appropriate alkalinity. The ladle covering agent has no carbon, does not carburize the molten steel, and is in favor of the component control of the production process.

The invention relates to a desulfurization gypsum basic steel slag composite gelled material and a preparation method thereof. The desulfurization gypsum basic steel slag composite gelled material comprises the following raw materials by weight percentage: 65-95 of desulfurization gypsum, 5-35 of steel slag and an exciting agent of 0.1-5 of the total weight of the desulfurization gypsum and the steel slag, wherein the summation of the weight percentages of the desulfurization gypsum and the steel slag is 100 percent. The preparation method of the composite gelled material comprises the following steps: sifting the steel slag and the desulfurization gypsum for filtering out large grains and pouring the steel slag and the desulfurization gypsum into a material mixing pot for mixing for 20-30 minutes; gauging a standard consistency water consumption of water and pouring the water into an agitator kettle for standby; then weighing the exciting agent, adding the exciting agent to the mixture of the desulfurization gypsum and the steel slag by a first mixing method or a simultaneous mixing method and uniformly mixing the mixture; and agitating, molding and maintaining the mixed materials to obtain the composite gelled material. The method combines two industrial wastes so as to sufficiently improve the utilization rate of the steel slag and the desulfurization gypsum, change the wastes into valuables and also form the gypsum material with good heat preservation, heat insulation and sound insulation performance.

The present invention provides a regeneration method for a desulfurization liquid of coal-to-fuel gas wet oxidation method desulfurization, wherein a desulfurization liquid changed into a pregnant solution is introduced into a regeneration tank under a catalysis condition, oxygen gas and air are mixed according to a volume ratio of 1:(5-6), the mixed gas is introduced into the pregnant solution in the regeneration tank, and a reaction is performed to obtain the finished product. The regeneration method has characteristics of simple process, easy condition control, and low cost. During a desulfurization liquid regeneration process, a catalyst use amount is low, a secondary salt production amount is less, sulfur foam characteristics are stable, flotation is easily performed, desulfurization efficiency is high, a desulfurization liquid regeneration effect is good, and a recycling rate is high.

The invention provides a ladle covering agent prepared through utilizing blast furnace slag. The ladle covering agent is composed of 30-40 parts by weight of blast furnace slag, 26.7-40 parts by weight of limestone, 15-20 parts by weight of vermiculite and 5-15 parts by weight of fluorite, wherein the total weight part of the above raw materials is 100. The main raw materials of the ladle covering agent have the advantages of low cost, suitable melting point, short fusing time and good spreadability; and limestone decomposes at 800-1200DEG C, foams and expands, vermiculite expands at a high temperature, and the friction force among solid particles is lower than the inner friction force among powders, so the spreadability and the heat insulating property are good. The ladle covering agent can prevent the secondary oxidation and too large temperature decrease of molten steel, and has a certain impurity adsorption and inclusion capability to purify the molten steel because of the appropriate alkalinity. The ladle covering agent has no carbon, does not carburize the molten steel, and is in favor of the component control of the production process.

The application provides a method for cleaning a blast furnace before shutting down, and belongs to the technical field of shutting down an empty material line for blast furnace ironmaking. The method of washing the blast furnace before shutting down includes distributing cloth in the throat of the blast furnace, and then performing furnace washing and smelting. The standards for the furnace washing and smelting steps include: the edge temperature is 250-300°C, and the molten iron temperature is ≥1480°C. Through the step of distributing materials, in the step of furnace washing and smelting: in the slag, R is 1.05-1.16, the content of MgO is 8.0-9.0wt%, and the content of Al 2 o 3 The content of Si is ≤15.0wt%; in molten iron, the content of Si is 0.60-0.90wt%, the content of S is 0.025-0.045wt%, and the content of Mn is 0.50-0.80wt%. It can shorten the cleaning time of the furnace wall and the furnace hearth, and effectively save the shutdown time of the blast furnace.

This invention provides ladle top-slag used for vacuum decarbonization and refinery in vacuum tank. The ladle top-slag comprises: CaO 30-45 wt.%, SiO2 12-18 wt.%, Al2O3 25-35 wt.%, FeO 5-15 wt.%, MgO 3-8 wt.%, and H2O 0-0.2 wt.%. This ladle top-slag is granular mixture with granule sizes of 3-10 mm. The ladle top-slag can transfer oxygen from to steel melt, promote vacuum decarbonization without air, effectively inhibit residue overflow during decarbonization, improve the adsorption of lards in the steel melt after decarbonization, and promote desulfurization and deoxidization of the steel melt.

The invention relates to a covering powder material, in particular to an anti-bonding bleed-out continuous casting covering slag. The components of the anti-bonding bleed-out continuous casting covering slag in weight percent are as follow: 2-8% of Al2O3, 2-7% of F, 4-8% of Na2O, less than 4% of Li2O, 2-15% of B2O3, 0.7-3% of C, less than 3% of impurities carried in by raw materials, and balance of CaO and SiO2 with the weight ratio of CaO / SiO2 being 0.5-0.8. The properties of the covering slag are as follows: solidification temperature is less then 980 DEG C, viscosity at 1300 DEG C is 0.2-0.5Pa.s, and no crystal is precipitated during solidification. The usabilities of the covering slag are as follows: consumption rate is larger than or equal to 0.4kg / t steel, and the thickness of melt slag layer is 10-16mm. The anti-bonding bleed-out continuous casting covering slag in the invention can prevent the phenomenon of bonding bleed-out, improve operation rate of continuous casting machine, and reduce cost and accidents.

The invention discloses a deplating solution and a deplating process for removing glass NCVM film, and relates to the technical field of glass deplating. The deplating solution includes the following components in terms of mass percentage: soluble carbonate 10-30% , complexing agent 5-15%, penetrating agent 1-5%, and the rest is water. The stripping process uses the above-mentioned stripping solution to strip the NCVM film layer of the glass product. The invention alleviates the technical problems that the strong alkaline deplating solution traditionally used for the stripping of the NCVM film easily causes damage to the photosensitive ink after exposure and development, and the product yield is low. The stripping solution of the present invention uses soluble carbonate as the main stripping agent, and by cooperating with complexing agent and penetrant, not only can strip NCVM film cleanly, the stripping effect is good, and it will not affect the exposure and development The final photosensitive ink will cause damage, and the glass products after deplating using this deplating solution have good appearance and high yield.

The invention discloses an environment protective, high effective washing cream prepared by compounding two types of surface active agents and using 4A zeolite as the detergency promoter, the formulation comprises dodecylbenzene sulfonic acid sodium 0-15 wt%, dodecyl sodium sulfate 0-15 wt%, 4A zeolite 10-20wt%, sodium silicate 5-10wt%, sodium chloride 1-10 wt%, addition agent 0-10 wt%, water 20-50 wt%.

The present invention provides a cold heading steel, a cold heading steel ladle furnace refining process and a cold heading steel production process. The cold heading steel comprises the following chemical components by weight: 0.19-0.22% of C, less than or equal to 0.10% of Si, 0.75-0.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.030% of S, more than or equal to 0.02% of AlT, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.20% of Cu, and the balance of Fe. According to the present invention, in the cold heading steel production process, application of aluminum to carry out deep deoxidation, silicon calcium wire feeding, immersion type nozzle application and other steps are adopted, such that the internal components of the produced cold heading steel are reasonably matched, and especially the combination of the C with the content of 0.19-0.22% and the Si with the content of less than or equal to 0.10% makes the cold heading steel meet strength, toughness and other comprehensive mechanical properties, such that the workability of the cold heading steel at a room temperature is good.

The present invention provides a regeneration method for a desulfurization liquid of coal-to-fuel gas wet oxidation method desulfurization, wherein a desulfurization liquid changed into a pregnant solution is introduced into a regeneration tank under a catalysis condition, oxygen gas and air are mixed according to a volume ratio of 1:(5-6), the mixed gas is introduced into the pregnant solution in the regeneration tank, and a reaction is performed to obtain the finished product. The regeneration method has characteristics of simple process, easy condition control, and low cost. During a desulfurization liquid regeneration process, a catalyst use amount is low, a secondary salt production amount is less, sulfur foam characteristics are stable, flotation is easily performed, desulfurization efficiency is high, a desulfurization liquid regeneration effect is good, and a recycling rate is high.

The invention relates to sintered flux for nickel strip electrode electro-slag welding. The sintered flux for the nickel strip electrode electro-slag welding is characterized in that the intered flux is prepared from dry powder components and binder water glass; the dry powder components comprise, by mass, 45-75% of CaF2, 15-35% of Al2O3, 1-5% of SiO2, 1-5% of CaO, 1-5% of MgO, 1-10% of sodium fluoroaluminate, 1-5% of rare earth fluoride and 1-5% of ferroniobium alloy powder; the ratio of potassium to sodium of the binder water glass is 1 to 1, the molar ratio is 2.2-3.5, the baume degree at room temperature is 38-50, and the dosage is 15-25% of the weight of the dry powder. The sintered flux can be used through being matched with various nickel base welding strip such as EQNiCrMo-3 and EQNiCr-3, when strip electrode electro-slag surfacing is conducted through matching with the nickel base welding strip, stable electro-slag process and welding technological property can be maintained at the quick welding condition of 250 mm / min, the quality of formation of surfacing layers is good, defects do not exist in lap joint, and various indexes of the surfacing layers can meet usage requirements of users.

A high-early-strength cement-based rapid repair material is made of raw materials including the following components by mass: 500-650 parts for sulphoaluminate cement, 200-400 parts for ordinary Portland cement, and 800 parts for quartz sand ~900 parts, 4.5~9.0 parts of nano-silica, 0.25~0.6 parts of dispersant, 1.1~10.8 parts of water reducer, 0.045~0.160 parts of retarder, 0.10~0.25 parts of defoamer, 315~360 parts of water . The invention also provides a preparation method of the cement-based quick repair material with improved early strength. It is convenient and easy to prepare on site. It is compounded with sulphoaluminate cement and Portland cement to ensure the early and late strength. Nanomaterials can significantly improve the microstructure of the composite repair system and significantly improve the early mechanical properties of cement-based materials; The driving quality and driving safety of the repaired road surface; the repairing cost is low and the practicability is strong.

The invention relates to a planted concrete material prepared by wet grinding potassium feldspar and phosphorus tailings and a preparation method thereof. The planted concrete material is composed of the following components in parts by weight: 22-33 parts of coarse aggregate, 5.3-7.154 parts of cement, 1.378-1.86 parts of water, 0.0159-0.0214 parts of polycarboxylate water reducing agent, 0.795-1.323 parts of wet-milled phosphorus tailings powder, 0.795-1.323 parts of wet-milled potassium feldspar powder, and 1.1528-1.3675 parts of 3 wt% oxalic acid solution. In the present invention, phosphorus tailings and potassium feldspar are mixed into the cementitious material after wet grinding, which can improve the mechanical properties of the cementitious material in the later stage; Dissolution K + , P + , in order to play the role of slow-release fertilizer, so as to continuously provide necessary mineral elements for the growth of plants; in the later stage, the pH value of the system is effectively reduced by acid spraying and alkali reduction, which provides good growth conditions for plants, which is conducive to improving the performance of planted concrete materials. comprehensive performance.