256results about How to "Improve smelting efficiency" patented technology

The invention discloses an iron extracting and steelmaking process for treating copper ore tailing and nickel molten slag by an ore heating furnace, a shaking furnace, a steelmaking electric arc furnace and a refining furnace. The iron extracting and steelmaking process comprises the following steps of: (1) uniformly mixing copper ore tailing and a carbonaceous reducing agent and granulating into pellet lump ore; (2) charging the pellet lump ore into the ore heating furnace and smelting to obtain silicon-contained molten iron; (3) desulfurating and deslagging the silicon-contained molten iron to obtain low-sulphur-silicon molten iron or confirming whether sulphur is removed according to the sulphur content of the silicon-contained molten iron; (4) transporting the nickel molten slag to an iron extracting station in a heat preserving way; (5) charging the nickel molten slag into the shaking furnace, adding lime and low-sulphur-silicon molten iron, mixing and stirring to obtain reduced molten iron; and (6) conveying the reduced molten iron into the electric arc furnace and adding lime for desulfurating, decarbonizing and dephosphorizing to obtain molten steel. The process reasonably utilizes the components of the copper ore tailing, fully recovers valuable metals in the copper ore tailing and the nickel molten slag, achieves the aim of comprehensive utilization, has reasonable design, is convenient for mastering and construction and is suitable for industrialized application.

A rotary hearth furnace iron-making method utilizing biomass carbon-containing pellets to serve as a raw material belongs to the field of ferrous metallurgy and relates to a rotary hearth furnace iron-making process using the biomass to serve as iron-making fuel and a reducing agent. The process comprises the steps, utilizing reproducible carbon neutral biomass coke powder to replace pulverized coal, enabling the biomass coke powder and the iron ore powder to be matched with each other according to C/O=1.1-1.4, adding an appropriate binder, evenly mixing to make pellets, and enabling the pellets to enter a rotary hearth furnace to be heated and undergo reduction so that a metalized pellet is obtained. The biomass coke has carbon neutral and can fundamentally reduce discharge of pollutantssuch as CO2 caused by coal consumption. The impurity content of the biomass coke is little, the problem that sulphur content of products caused by coal using is too high is solved, and the comprehensive quality of the products is improved. The energy in the preparation process of the biomass coke can be supplied by biomass itself, and green circulating production is substantially achieved. The rotary hearth furnace iron-making method expands energy sources for rotary hearth furnace iron making, reduces production cost, improves product quality and production efficiency and reduces environmental pollution.

The invention discloses a combined carbonaceous reducing agent for smelting metal silicon and a preparation method thereof. The combined carbonaceous reducing agent comprises refined pulverized coal and petroleum coke powder, wherein the refined pulverized coal accounts for 70-80% of the total weight; the refined pulverized coal is prepared from the raw material soft coal by oil agglomeration selective flocculation de-ashing treatment; the refined pulverized coal contains 75-80% of fixed carbon, 3.5-4.5% of ash content and 16-21% of volatile content by weight; and 2-3% of binder is added into the mixture of the refined pulverized coal and the petroleum coke powder, and then a combined carbonaceous reducing agent pellet is prepared by cold press molding briquetting and drying treatment. According to the invention, the ash content and impurities in the soft coal are removed by a flotation method, the petroleum coke powder serves as supplement of the fixed carbon, and the two are combined to obtain a combined carbonaceous reducing agent with high content of fixed carbon, low ash content and low content of impurities. Through the invention, the problem that the reducing effect is unsatisfactory by using the soft coal only is solved, the smelting efficiency and the product quality are improved, and the added value of the soft coal is increased.

The present invention provides a blast furnace iron-smelting method, including: a first step, loading coke, semi-coke and other iron-contained charging stock into the blast furnace, wherein, the semi-coke has a scheduled weight ratio in the coke and semi-coke; and a second step, performing conventional iron-smelting operations after the loading. The method can use semi-coke to replace part of coke, thus can reduce the amount of coke in the blast furnace iron-smelting process.

The invention belongs to the field of ferrous metallurgy and relates to a blast furnace iron-making process using water-coal-slurry as fuel and reducer for iron-making. The process using water-coal-slurry is simple and safe, and the injecting process of water-coal-slurry provides convenience for accurate control and precise measurement. A water-coal-slurry oxygen blast furnace utilizes normal-temperature oxygen and water-coal-slurry as fuel which is injected into the blast furnace so as to partially displace coke and coal dust; the injected amount of oxygen is 200 to 500 Nmt HM, the injected amount of water-coal-slurry is 200 to 400 Nm/t HM, the required weight ratio between coal and water in the water-coal-slurry is 7:3, and the required thermal value of the water-coal-slurry is larger than 20 MJ/kg. The water-coal-slurry is decomposed and burnt to generate water-gas reaction in a circulation zone of a blast-furnace tuyere, the absorbed heat can be adopted to solve the problem of 'lower hot' caused by smelting with prior oxygen blast furnaces, and a large amount of gas generated by the decomposition and burning of the water-coal-slurry raises and can relieve the problem of 'upper cold' caused by the full-oxygen injection of the blast furnace; and the water-coal-slurry oxygen blast furnace contains rich H2 so as to enhance the penetrating power and reduction performance of blast-furnace coal gas, raise the indirect reduction degree of the blast furnace and reduce the emission amount of CO2 by 200 to 500 Nm/t HM. The process reduces both manufacturing cost and pollution to environment.

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 relates to the technical field of steelmaking, and provides a full scrap steel electric arc furnace quasi-continuous steelmaking system and process. Different media in electric arc furnace molten pools at two stations are dynamically injected in different times, melting down is accelerated through molten pool carburization, and the molten pool carbon content is increased; molten pooldephosphorization conditions are improved by changing a slag making process; two electric arc furnaces are arranged in high position and low position correspondingly, the first electric arc furnace in the high position is connected with the second electric arc furnace located in the low position through a buffer chute in the steel tapping process, molten steel is directly poured into the electricarc furnace in the low position through the buffer chute, the molten steel ladle-to-ladle efficiency is improved, after steel tapping is completed, the buffer chute returns to the home position, andthus the two electric arc furnaces are separated; and the processes of the two electric arc furnaces are dynamically matched, and high-efficient rapid quasi-continuous steelmaking is achieved. By applying the system and process, the phosphorus content of electric arc furnace smelted molten steel is lower than 0.010%, the power consumption per ton of steel is reduced by 10 kWh or above, the smelting cycle is shortened by 5 min or more, the molten steel cleanliness is obviously improved, the smelting pace is increased, and the production cost is reduced.

The invention provides a blast-furnace taphole stemming prepared from titanium-iron slag. The blast-furnace taphole stemming is characterized by being prepared from the following raw materials in percentage by weight: 30-50% of ferrotitanium slag, 5-10% of corundum, 10-20% of silicon carbide, 5-10% of ferrosilicon nitride, 10-15% of clay, 5-8% of asphalt and 10-18% of coke. According to the invention, 10-20% by weight of a binding agent is additionally added into the raw materials for preparing the blast-furnace taphole stemming. Because the ferrotitanium slag generated from the production of ferrotitanium alloy is recycled, the discharge of wastes can be reduced, the recycling of resources can be promoted, and further the consumption of mineral resources like bauxite, corundum and silicon carbide for producing the blast-furnace taphole stemming can be reduced. By using the blast-furnace taphole stemming provided by the invention, the taphole enlarging rate can be reduced effectively, the tapping time can be prolonged, the smelting efficiency of the blast furnace can be improved greatly, the consumption of refractory of the blast furnace can be decreased, and the cost can be saved. The blast-furnace taphole stemming is highly practical.

The invention relates to a method for smelting an iron-based nanocrystalline master alloy. The method comprises the following process steps of: putting raw materials in a furnace according to the process requirement; vacuumizing, transmitting power, adjusting heating power and time as well as adding residual pure iron into the furnace in the process; insulating for 15 minutes when the temperature reaches at 1520+/-10 DEG C, stopping power transmission and cooling to 1460 +/-10 DEG C, adding metallic silicon, adjusting the heating power to 100kW, smelting for 30 seconds, adding cathode copper into the furnace after the time is ended and guaranteeing the heating power of 100kW and the smelting time for 30 seconds at the same time; and stopping power transmission and cooling to 1360+/-10 DEG C, opening a furnace cover, continuously to heat to 1280+/-10 DEG C, tapping steel and pouring molten steel into a steel ingot mould. Through the reasonable material distribution and the control of heating power and time, the smelting efficiency is improved and the problems of great furnace lining damage, severe burning loss of beneficial elements, high impurity content in the master alloy and the like in the process of smelting nanocrystalline master alloy are effectively solved.

The invention discloses a control system for the blowing of a copper converter. The control system comprises a slag forming endpoint detection unit, a copper forming endpoint detection unit and a data processing unit, wherein the slag forming endpoint detection unit is used for acquiring characteristic spectrum emission intensity signals of PbO and PbS in melt in the copper converter on line in a slag forming period; the copper forming endpoint detection unit is used for acquiring a concentration signal of SO2 in the flue gas of the copper converter on line in a copper forming period; the data processing unit is used for performing analytical processing to judge whether the signals acquired by the slag forming endpoint detection unit and the copper forming endpoint detection unit reach slag and copper forming endpoints or not and whether to stop blowing or not. According to the control system, the slag and copper forming endpoints in a blowing process of the copper converter can be accurately judged, so that the phenomena of over-blowing, under-blowing and the like are avoided, the safety production of blowing of the copper converter is ensured, and the copper smelting efficiency is improved.

The invention relates to a bottom argon blowing method capable of quickly homogenizing molten steel, and belongs to the technical field of external refining. The bottom argon blowing method is characterized in that a double-hole strong-blowing and weak-blowing bottom argon blowing mode is adopted; after an alloy is added to a steel ladle, argon blowing is carried out at the bottom of the steel ladle, one hole is subjected to weak blowing, and the other hole is subjected to strong blowing; a weak blowing flow rate is 100-150L/min; a strong blowing flow rate is 500-700L/min; the two argon blowing holes are positioned at places which are 0.64-0.7R away from the center of the bottom surface of the steel ladle; R is the inner diameter of the bottom surface of the steel ladle; and an included angle between the two argon blowing holes is 120-180 degrees. Compared with the traditional double-hole identical flow rate blowing mode, a strong molten steel circulation flow and a weak molten steel circulation flow that are formed by the strong-blowing and weak-blowing mode can homogenize the temperature and components of the molten steel more quickly; the size of a dead zone in the steel ladle is reduced; the cost of a refining workshop is reduced; and the refining efficiency is improved.

The invention provides a nickel matte preparation method. The nickel matte preparation method comprises the steps of feeding laterite nickel ores and/or nickel-containing waste residues into an ore melting furnace to obtain liquid-state molten high-nickel slag; and feeding the liquid-state molten high-nickel slag and a vulcanizing agent into a matte smelting furnace to be subjected to matte smelting to obtain nickel matte and furnace slag. According to the nickel matte preparation method, the continuous melting matte smelting two-furnace series short process is adopted. The melting slag makingstage and the matte smelting vulcanization stage are separated, the smelting efficiency is improved, and energy consumption is reduced. Meanwhile, the recovery rate of nickel and cobalt in a productis high.

The invention discloses a high-manganese and high-aluminium non-magnetic steel plate manufactured through a 50t medium-frequency induction furnace and a manufacturing method thereof. The high-manganese and high-aluminium non-magnetic steel plate smelted through the 50t medium-frequency induction furnace comprises the components, by weight, of 0.08-0.25% of C, 0.25-0.40% of Si, 15-20% of Mn, no more than 0.020% of P, no more than 0.010% of S, 2-4% of Al, 0.02-0.04% of Nb, 0.015-0.030% of V, 0.014-0.018% of Ti, 0.012-0.016% of Cu, and the balance Fe and inevitable impurities. The yield strengthRp0.2 of the steel plate at the normal temperature is larger than or equal to 340 MPa, the tensile strength Rm is larger than or equal to 600 MPa, the percentage elongation after fracture A is 45%-50%, and the percentage reduction of area Z is larger than or equal to 65%. The high-manganese and high-aluminium non-magnetic steel plate is uniform in chemical component and microscopic structure, excellent in mechanical property, low in relative magnetic permeability, low in internal stress, and good in plate shape.

The invention belongs to the technical field of slag reutilization and particularly relates to a process for reusing slag of an aluminum smelting furnace. The process adopts the smelting furnace. Thesmelting furnace comprises a box body and further comprises a crushing unit, material guide units, a smelting chamber, a motor, a collecting box, a first pipe, a purifying unit and a controller. By the adoption of the process, on the one hand, in the process of mixing the aluminum slag and an aqueous solution of a sintering machine, the aluminum slag and the aqueous solution of the sintering machine are fully mixed to form blanks while being added and stirred; meanwhile, spray nozzles are used to spray water mist to the blanks during the pressurization and plasticity of the blanks, so that theblanks are tightly attached, no fracture occurs between the blanks during sintering in the sintering furnace, and thus the quality of a refractory blank is improved; and on the other hand, the formedrefractory blank is installed on the inner wall of the smelting chamber to prevent the smelting furnace from being damaged when aluminum metal is smelted, so that the service life of the smelting chamber is prolonged.

The invention discloses a copper converter converting control system which comprises a slag forming end point detection unit and a copper forming end point detection unit, wherein the slag forming end point detection unit is used for online collecting characteristic spectrum emission intensity signals of PbO and PbS of the melt in a copper converter in the slag forming period; the copper forming end point detection unit is used for online collecting gas concentration signals of SO2 in flue gas in a copper converter gas duct A in the copper smelting period; a data processing unit is used for analyzing and processing the signals collected by the slag forming end point detection unit and the copper forming end point detection unit to judge whether the converting reaches the slag forming end point and the copper forming end point, and performs regulation and control to determine whether the blowing out is performed. The control system can accurately judge the slag forming end point and the copper forming end point, so that the phenomena including over-blowing, under blowing and the like can be avoided, the safety production of copper converter converting is ensured, and the efficiency of copper smelting is improved.

The invention discloses a using method of a rotary type microwave metallurgical furnace. An inner separating layer is attached to the inner wall of a furnace body, a plurality of magnetrons are installed on the inner wall of the inner separating layer and are evenly and symmetrically distributed, a horizontal furnace pipe is arranged in the center of an inner cavity of the furnace body, the left and right ends of the furnace pipe are rotationally connected to the left and right sides of the furnace body through an external rotating shaft correspondingly, the left end of the external rotating shaft penetrates the left side of the furnace body, an internal rotating shaft transversely penetrating the furnace body and the furnace pipe can be rotationally connected to the interior of the external rotating shaft, a plurality of rotating blades are welded to the internal rotating shaft and are evenly distributed to an inner cavity of the furnace pipe, a feeding opening is formed in the top ofthe furnace pipe, and a pneumatic gate valve is arranged at the top of the feeding opening. The rotary type microwave metallurgical furnace is simple in structure, stable, reliable, safe, efficient,even in microwave transmission and capable of achieving heat isolation and heat preservation; through dual rotation of the furnace pipe, material heating is more even and sufficient, and the smeltingefficiency is improved.

The invention provides a method for preparing calcium carbide. The method comprises steps as follows: raw coal is dried so as to obtain dried raw coal; the dried raw coal and lime are smashed respectively so as to obtain raw coal powder and lime powder; excessive raw coal powder and lime powder are mixed so as to obtain a mixed material; the mixed material is pressed into pellets, so that pellet materials are obtained; the pellet materials are subjected to pyrolysis treatment, so that artificial petroleum, artificial natural gas and solid pyrolysis products are obtained, wherein the solid pyrolysis products contain semi coke and lime; the solid pyrolysis products are sent to a gas smelting furnace through hot delivery, a little air is introduced into the gas smelting furnace, and accordingly, smelting processing can be performed in the gas smelting furnace to obtain calcium carbide. The smelting energy consumption and the production cost can be obviously reduced with the method, and meanwhile, the production efficiency of the calcium carbide can be further improved.

The invention relates to a physical preparation method of high density vanadium oxide powder. Prepared high density (bulk density) vanadium oxide can be used to smelt vanadium-contained alloys and prepare metal vanadium as an additive or a main raw material. The physical preparation method is characterized in that: routine vanadium oxide powder is added to 0.1 wt% of a nonionic surfactant pulvis at a temperature of -20-120DEG C to improve the density and the stability of granulation and enhance the exhaust effect; mechanical pressurization, dry flaking, and granulation are directly carried out to prepare vanadium oxide particles with the granularity of 0.3-10mm; and in the process of flaking and granulation, the mechanical pressurization strength applied to the vanadium oxide powder is 10-125N/cm<2>, and the bulk density of granulated vanadium oxide is improved to 1.4-2.1g/cm<3> from routine 0.6-1.2g/cm<3>. High density vanadium oxide which has good airflow resistant effects and good furnace charge contact reacting performances allows the gasification and fly loss of vanadium oxide to be reduced, the smelting efficiency to be improved, and the density and the reaction efficiency of vanadium nitride products to be obviously improved in the production of vanadium nitride; and the density of the vanadium nitride products is far greater than the density of vanadium oxide products produced by chemical methods.

The invention relates to an undisturbed furnace changing control method for a hot blast stove. The undisturbed furnace changing control method comprises the following steps that 1, atmospheric pressure and temperature compensation are carried out on an air blower, and a compensated air outlet pressure value is r(t); 2, a furnace changing starting signal is obtained, and a stationary blade of the air blower is controlled to be increased to a preset opening degree; 3, the pressure value y(t) in a cold air pipe connected with the air blower is detected; 4, according to the pressure value y(t) and the air outlet pressure value r(t), PID control is adopted to adjust the static blade opening degree of the air blower, so that the pressure value y(t) is equal to the air outlet pressure value r(t); and 5, a furnace changing ending signal is obtained, and the PID control is stopped. According to the technical scheme, the problem of hot air pressure fluctuation caused by hot air furnace changing is effectively solved.

The invention relates to a control method for an argon-oxygen refining ferrochrome carbon content based on expert internal model control, and relates to the technical field of Argon oxygen decarburization (AOD) furnace refining low-carbon ferrochromium alloys. According to the method, when an internal model control model is built, a form of a given filter is defined, the filter is serially connected into the internal model control model, a building method of a filter time constant expert control system is particularly given, and the filter time constant expert control system can be used for building and evaluating a filter time constant with a best performance and is used for automatically optimizing and adjusting the filter time constant in an internal model controller in the whole smelting process. According to the control method for the argon-oxygen refining ferrochrome carbon content based on the expert internal model control provided by the invention, the influence of external unmeasured disturbance on the whole smelting process can be effectively overcome, and the steady-state zero-deflection accurate control on a terminal carbon content is realized; and a heat balance equation in an AOD furnace smelting process can be accurately built, and an accurate relationship between a molten pool temperature change rate and a gas supply speed is obtained, so that the smelting efficiency of the argon-oxygen refining low-carbon ferrochromium alloy is improved.

The invention discloses equipment for removing nonmetallic slag inclusion in a steel and iron smelting process. The equipment comprises a primary centrifugal barrel communicated with a tundish, and also comprises a box body, a secondary centrifugal barrel, a ladle and a hydraulic lifting device. A method for removing the nonmetallic slag inclusion by using the equipment comprises that: the nonmetallic slag inclusion is adsorbed through cleaning slag by two times of centrifuging and cleaned, and the passing cleaning slag is accumulated at the bottom of the ladle, so that high-cleanliness molten steel is obtained. Compared with the traditional technology, the equipment and the method overcome the defect that the slag inclusion of big granules cannot be timely adsorbed by the cleaning slag in a process of removing the nonmetallic slag inclusion in the electromagnetic driving centrifugal rotating tundish technology, improve the adsorption effect, and ensure high cleanliness of the centrifuged molten steel; and the nonmetallic slag inclusion is timely adsorbed by the cleaning slag in a two-stage centrifuging mode after the molten steel is subjected to two-time centrifugation, the working process is continuous, the centrifuging effect is good, the smelting efficiency and the quality of the high-cleanliness steel are greatly improved, and the production quantity of the high-cleanliness steel is improved.

The invention discloses an efficient and energy-saving secondary lead smelting technology. The efficient and energy-saving secondary lead smelting technology comprises the steps of waste lead storagebattery collecting and crushing, material screening after waste lead storage battery crushing, material processing and classifying treating, secondary lead preparing and smoke treating and emitting inthe preparing process. According to the efficient and energy-saving secondary lead smelting technology, collected waste lead storage batteries are taken as raw materials for secondary lead, the condition that the waste lead storage batteries are littered at will to pollute the environment is avoided, the cost is reduced for the production process of the secondary lead, and lead ore resources areeffectively saved; secondary lead smelting is conducted by adopting a blast furnace, the blast furnace has the characteristics of being high in heat efficiency, high in specific productivity, high inmetal recycling rate, low in cost and small in occupation area, therefore, the secondary lead smelting efficiency is improved, and meanwhile energy consumption in the smelting process is reduced; andthe technology is simple, easy to operate and high in recycling rate, and therefore development of the secondary lead smelting technology is facilitated.