119results about How to "Improve dephosphorization rate" patented technology

The invention relates to a stainless steel smelting method by a two-step process. The method comprises the following steps: (1) smelting dephosphorized molten iron; (2) smelting semisteel; (3) lifting the semisteel to a deslagging station for deslagging treatment; (4) adding the semisteel to a GOR refining furnace for air refining; (5) refining; (6) continuous casting and (7) finishing, thinning and then rolling. Compared with the present method for producing the stainless steel by smelting, the method has the advantages of wide application scope of raw materials, low energy and resource consumption, strong variety development capacity, high recovery rate of chromium-nickel metal, high production efficiency and the like. Sulfide, oxide, silicate and punctiform non-metallic inclusion in the steel have low grade, the dephosphorized molten iron is provided by a top-bottom combined blowing converter and smelting is performed by the two-step process in an EAF+GOR refining furnace, thus the method has relatively low production cost and relatively large cost advantage, and the performance of a rolled finished product is consistent with a user quality standard.

The invention provides a processing method of refined rice suitable for patients suffering from kidney disease. The processing method comprises the following steps: (I) carrying out pretreatment, specifically, soaking the cereal raw material, separating out soaking liquid, crushing and levigating until the particle size is 10-100 meshes; (II) carrying out protease hydrolysis deproteinization; and (III) carrying out dephosphorization: dephosphorizing the cereal raw material subjected to deproteinization in the step (II) by phytase hydrolysis, or addition of yeast for fermentation, or a composite mode of phytase hydrolysis and yeast fermentation, or a composite mode of yeast and lactic acid bacteria microbial fermentation or phytase hydrolysis, yeast and lactic acid bacteria microbial fermentation; separating, cleaning, separating again, drying and crushing; and (IV) performing sieving, mixing, hardening and tempering, preheating, gelatinization, extrusion forming and drying processing on the cereal raw material processed by the step (III) to obtain the refined rice. According to the method provided by the invention, the processes of deproteinization and dephosphorization of the cereal raw material can be finished at a time, the deproteinization rate and the dephosphorization rate are high, and food raw material and products are provided for the patients suffering from kidney disease and other diseases.

The invention relates to a converter steelmaking method through power injection dephosphorization by adopting a supersonic speed oxygen lance and a supersonic speed oxygen lance, which can be used for solving the problems that slagging is slow in the steelmaking process and the dephosphorization rate is low caused by low stirring intensity in a dephosphorization period. A slagging material used for dephosphorization is transmitted through a supersonic speed oxygen lance and is sprayed into a molten pool in a supersonic speed power gas jet flow state and is fully contacted, so that rapid slagging is realized in the steelmaking process; thermodynamic and dynamic conditions of dephosphorization reaction are improved; and the steelmaking dephosphorization rate is improved; a power feeding pipe of the supersonic speed oxygen lance is connected with a oxygen blowing central pipe; the outlet of a power supply pipe is positioned between the upper part of the oxygen lance and the outlet of a sprayer; the inner diameter is 10-150mm; the power injection flow is 30-500kg/min; the carrier gas flow is 50-3000Nm3/h and the pressure is 0.4-1.4MPa; a wear-resistant material is adopted at the damage part of a lance sprayer; and the mach number is 1.5-2.1. The converter steelmaking method is suitable for30-350 tons of a converter steelmaking dephosphorization process; compared with the traditional steelmaking process, the dephosphorization rate using the method can be improved by over 5%; the consumption amount of the slagging material is lowered by over 10%; and the metal yield is improved by over 0.5%.

The invention particularly relates to a dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction, and the technical scheme comprises the following steps: mixing 60-83wt% of high phosphorus hematite powder, 10-15wt% of carbonaceous reducing agent, 6-15wt% of quicklime and 1-10wt% of additive uniformly, pressing the mixture into blocks, drying, reducing in a high temperature furnace under 1250-1350 DEG C, and keeping the temperature for 15-30 minutes; carrying out furnace cooling until the temperature is 600-800 DEG C, taking the reduction product out, naturally cooling, grinding and performing the magnetic separation to obtain pig iron particles. The additive is sodium carbonate, or potassium carbonate, or the mixture of the sodium carbonate and the potassium carbonate; drying is carried out under the condition of 110-120 DEG C until the weight of the mixture of raw materials is constant; and the high temperature furnace is a resistance furnace, or a rotary kiln, or a rotary hearth furnace, and the atmosphere in the high temperature furnace is neutral or weak-reductive. The invention has the advantages of short reduction time, simple process, high dephosphorization rate, high iron yield, less environmental pollution, recyclable residue and the like.

A method for producing high carbon steel through double-slag high drawing carbon tapping belongs to the technical field of smelting high carbon steel through a converter. The method comprises processing steps as follows: molten iron and steel scraps are loaded in the converter according to a certain molten iron ratio; in a first stage of converter steelmaking, the converting is performed at the oxygen supplying intensity of 2.8 Nm<3>/min/t, active lime and ore fluxing mediums are added in the converter, and a larger bottom blown flow rate is adopted to stir; the converting is performed at a standard lance height in the prior period for the converting of the converter, and then the lance height rises gradually; part of furnace slag is dumped through a rocking furnace; in the second stage for the converting of the converter, the converting is performed at the oxygen supplying intensity of 3.3 Nm<3>/min/t, and active lime and the ore fluxing mediums are added in the converter; the lance height rule that the converting is performed at a higher lance height in the later period and the lance height descends stage by stage is adopted; a small quantity of ores and fluorites are added frequently within 80 to 90 percent of total converting oxygen consumption; after the converting of the converter is finished, deslagging is performed through the rocking furnace of the converter, and temperature measurement and sampling are carried out; and converter tapping is carried out. The method has the advantage of overcoming the shortages of serious rephosphoration caused during the tapping process, low production efficiency, and so on.

The invention discloses a dephosphorization agent prepared by taking slag of a decarbonization furnace as a raw material and a molten iron dephosphorization method, and belongs to the technical field of molten iron desulphurization. The dephosphorization agent is composed of, by weight, 40-60% of the slag of the decarbonization furnace, 10-30% of fly ash, 10-30% of lime powder and 5-10% of a slagging agent; after being processed by a slag processing method, the slag of the decarbonization furnace is taken as a standby material of the dephosphorization agent after magnetic separation, smashing and levigating, and a prepared material is pressed to be the dephosphorization agent by a high-pressure ball press after uniform mixing. After a converter starts blowing, the dephosphorization agent is added in 10-20kg/t of steel, 10-20kg/t of lime and 10-20kg/t of magnesium balls or light-burned dolomite to form pre-slag of molten iron desulphurization at the early stage of the converter, and more than 60% of molten iron desulphurization rate at the early stage of the converter can be obtained. A condition is created for realizing a converter clean steal smelting platform.

Disclosed is a converter high-carbon low-phosphorous end-point control metallurgy method under the condition of phosphorous molten iron in a blast furnace. The method comprises the steps that the residual slag generated after slag splashing is reserved, molten iron and scrap steel are fed into a converter, an oxygen lance is controlled in the distance of 1.3m after ignition is finished, top oxygen blowing operation is conducted, and bottom argon blowing operation is conducted in the whole process; iron ore and lime are added to the converter, the turning-down temperature in the early period ranges from 1350DEG C to 1400DEG C, and the slag basicity in the early period ranges from 1.6 to 2.0; when the oxygen blowing quantity is 10%-15% of the total oxygen quantity, the oxygen lance is located in the distance of 1.5m-1.8m; when the oxygen blowing quantity is 30%-50% of the total oxygen quantity, slag generated in the early period is poured, the oxygen lance is located in the distance of 1.5m-2.3m, top oxygen blowing operation is conducted, bottom argon blowing operation is conducted in the whole process, lime is added to the converter to enable the final slag basicity to range from 3.2 to 3.4, and addition of the iron ore and the lime is accomplished before the oxygen blowing quantity is 75% of the total oxygen quantity; and when the oxygen blowing quantity is 85%-90% of the total oxygen quantity, the oxygen lance is located in the distance of being larger than or equal to 1.5m, and turning-down operation is conducted, when the content of carbon in molten steel is larger than 0.50% and the temperature is larger than or equal to 1580DEG C, oxygen blowing operation continues, and oxygen is blown to the molten steel, when [C] is larger than or equal to 0.30%, [P] is smaller than or equal to 0.013% and the temperature ranges from 1580DEG C to 1600DEG C, hot ladle tapping is conducted, and when tapping is conducted, aluminum iron alloy is added to a ladle to conduct deoxidization. The quality of the molten steel for hot rolled plates is ensured.

The invention provides a method of microwave heating, solid-state reduction and gasification dephosphorization for manganese ore powder. The invention adopts a novel method of microwave heating, solid-state reduction and gasification dephosphorization against the characteristic of the manganese ore powder with high content of phosphorus. The method uses the manganese ore powder as a raw material, coal powder as reducing agent, and nitrogen as reduction and dephosphorization protecting gas to perform solid reduction and gasification dephosphorization in a reduction dephosphorization crucible, through raw material selecting, thinning, mixing, stirring and distributing, in an airtight microwave reduction dephosphorization furnace, in the nitrogen atmosphere, at a high temperature of 1390 DEG C, for 20 minutes to preserve heat and keep stand at constant temperature, so that the manganese ore powder can react with the coal powder and lime powder to prepare sponge ferromanganese powder; and manganese powder can be separated from phosphorus and hazardous substances via cooling, fine grinding and dry magnetic separation purifying. The yield of the sponge ferromanganese can reach 95 percent, the dephosphorization rate can reach 60 to 70 percent, and the phosphorus-containing rate is less than or equal to 0.15 percent. The manganese ore powder has the advantages of good reduction effect, high dephosphorization rate, short process flow and no environmental protection, and can be reused after phosphorus is collected.

The invention discloses a molten iron dephosphorizing agent and an application method thereof. The dephosphorizing agent comprises the following components in percentage by weight: 75 to 85 percent of calcium oxide, 10 to 21 percent of iron oxide and 4 to 5 percent of calcium fluoride. The application method of the molten iron dephosphorizing agent sequentially comprises the following steps of: 1) weighing prepared pig iron, adding into an induction furnace, and starting to heat and melt the pig iron; 2) measuring the temperature and sampling after the pig iron is melted down, blowing oxygen in a molten pool from an oxygen pipe on the top of the furnace when the temperature is raised to 1,350+/-10 DEG C, and adding the premixed dephosphorizing agent in batches simultaneously, wherein 60 to 80 percent of dephosphorizing agent is added first, and the residual dephosphorizing agent is added after 3 to 5 minutes; and 3) continuously heating for 12 to 18 minutes, and finishing dephosphorization. By adjusting a ratio of the dephosphorizing agent to the oxygen, alkalinity and an adding mode, the consumption of the solid dephosphorizing agent is effectively reduced while high dephosphorizing rate is achieved, so that advantages are provided for the pretreatment of high-phosphorus molten iron in a converter.

The invention discloses a method for separating metal iron from phosphorus containing iron ore. The method includes the following steps: (1) fine grinding the phosphorus containing iron ore to obtain iron ore powder; (2) pelletizing the iron ore powder to obtain iron ore pellets; (3) drying the iron ore pellets to obtain dried iron ore pellets; (4) roasting the dried iron ore pellets to obtain roasted iron ore pellets; (5) performing gas-based reduction on the roasted iron ore pellets in a shaft furnace at the temperature of 800-900 DEG C to obtain metallized pallets; (6) performing melt separation under the nitrogen atmosphere after the metallized pallets are mixed with a fluxing agent and a dephosphorization agent to obtain metal iron and phosphorus containing tailings. The method can be used for effectively separating phosphorus in phosphorus containing iron ore, so as to obtain the metal iron with the phosphorus content lower than 0.2 wt% after separation.

The invention relates to a dephosphorization method for molten iron in a converter by blowing dust removal ash and belongs to the technical field of steelmaking. According to the dephosphorization process for dephosphorizing molten iron in the converter by blowing lime powder and dust removal ash through a dephosphorization oxygen lance, the device used in the dephosphorization process comprises an oxygen supply system and a powder blowing system; during the method, the oxygen supply system and the powder blowing system are adopted, the lime powder and dust removal ash are blown into a molten tank through the top-blowing dephosphorization oxygen lance, since the dust removal ash contains relatively high content of iron oxides, the content of ferric oxide in slag can be rapidly increased so as to promote the dissolution of lime and rapidly form slag having relatively high dephosphorization capability, the dephosphorization reaction is accelerated and meanwhile, the efficient utilization of the dust removal ash is achieved, the environmental secondary pollution due to the wastes is avoided and the dephosphorization method has relatively high economic and social benefits.

The invention discloses a method for decreasing phosphorus of high-phosphorus iron ore by adopting microwave reduction-magnetic separation, solving the problems that the dephosphorizing speed of the high-phosphorus iron ore is low, and the iron recovery rate and the dephosphorizing rate are low. The method is characterized by comprising the following steps: material smashing, blending, microwave reduction, sponge iron smashing, magnetic separation and post-treatment. Compared with the existing dephosphorizing method for the high-phosphorus iron ore, the method in the invention has the following benefits: high-phosphorus iron ore carbon heat reduction reaction is conducted faster and more thoroughly, the embedded structure of apatite is damaged, and the dephosphorizing rate and the iron recovery rate are improved by magnetic separation. By magnetic separation, low-phosphorus iron powder containing 0.2-0.3 percent of phosphorus can be obtained, and the dephosphorizing rate and the iron recovery rate can be more than 85 percent; and the carbon heat reduction time is short, the reduction temperature is lower than that in normal heating, the energy is saved, and the pollution is less.

The invention discloses a circulation injection method and system for preparing CO2 through converter gas and belongs to the technical field of converter gas resource utilization and CO2 purification preparation. The converter gas with the low N2 content and an oxidizing agent with the main components being O2 and CO2 are burnt in a closed burning device, burning heat is utilized through a heat exchange device, CO2-rich pure gas is obtained through purification treatment of the burning gas, can be used for purification and preparation of high-purity CO2 and can also be directly used as low-purity CO2, and the low-purity CO2 and the high-purity CO2 are circularly used for converter injection, converter sealing and preparation of oxidizing agents needed by gas burning. The method and system have the advantages that the converter gas with the low N2 content can be obtained, the gas produced through converter gas burning is circularly used, production and emission of nitric oxides are reduced, the low-purity CO2 is efficiently obtained and the high-purity CO2 is efficiently prepared with low cost.

The invention discloses a method for recycling steel-ladle hot-state casting residues by means of a converter, and belongs to the technical field of ferrous metallurgy. The problem that the casting residues and self waste heat of the casting residues cannot be effectively utilized in the prior art is solved. The method comprises the following steps that the hot-state casting residues remaining inthe steel ladle after molten steel pouring are returned to the converter steelmaking process for recycling and utilization, and the alkalinity of the hot-state casting residues ranges from 6 to 8. According to the method, the liquid-state continuous casting residues are used in an energy-saving, environment-friendly, effective and stable manner for realizing the heat-state recycling of the castingresidues; and the consumption of steel materials can be reduced, the sensible heat of furnace slag can be effectively utilized, the smelting efficiency can be improved, the steelmaking production cost is reduced, the quality of molten steel is improved, and the environment-friendly benefit is obvious.

The invention belongs to the technical field of iron and steel smelting and particularly relates to a fluoride-free slagging flux for the electric-arc furnace steelmaking and a preparation method thereof. The invention aims to provide the fluoride-free slagging flux for the electric-arc furnace steelmaking and the preparation method thereof and solve various problems of low slagging speed, poor slag melting effect, fluorine pollution, high cost, serious corrosion of a furnace lining, large dust capacity and the like which are generated due to the case that currently, lime, fluorite, calcium aluminate and iron oxide are used as slags. The fluoride-free slagging flux is characterized by being prepared from the following raw materials in percentage by weight: 20 to 40 percent of spodumene, 15 to 20 percent of red bauxite, 30 to 50 percent of active lime, 5 to 10 percent of iron oxide and 5 to 10 percent of magnesia.

A low-cost efficient dephosphorization smelting process for electric arc furnace belongs to the field of electric arc furnace smelting. According to the invention, reasonable blending process is carried out in a charging stage of the electric arc furnace; accessories in a traditional electric arc furnace smelting process is moved to a charging stage; through reasonable distribution of the cold raw materials and accessories in the electric arc furnace, problems of contradiction of theoretical demands of the dephosphorization oxygen potential, alkalinity and temperature during melting process of the cold raw materials and accessories is solved; and smelting dephosphorization process of the electric arc furnace runs through the whole process from starting to the end of the melting, so as to achieve the goal of efficient dephosphorization. The invention has the following advantages: the difficulty in dephosphorization of electric arc furnace traditional smelting process is solved; dephosphorization is basically realized when the melting down of the cold materials; and the process realizes dephosphorization rate of 75%-90%, rephosphorization rate after deslagging less than 5%, and end point phosphorus lower than 0.01%.