286 results about "Iron industry" patented technology

The invention relates to a high-speed resin heavy-load grinding wheel and a preparation method thereof. In the method, special material formulas of an outer grinding layer, core material and a hole core are designed separately, wherein used materials include four parts, namely a binding agent which is special for a high-performance modified high-polymer-based phenolic resin grinding wheel and prepared from phenolic resin, new phenolic resin and polysulfone resin, grinding materials such as fused zirconia alumina, alumina sintering corundum and black silicon carbide, fillers such as pyrite, cryolite and calcium carbonate (lime), and reinforcing materials such as mixed fine-particle-size grinding material, fiber, steel rings (local reinforcement) and the like; and a two-phase reinforced compound technology and structure are used to prepare the high-speed resin heavy loading grinding wheel. In the invention, the tensile strength, the folding strength and the grinding rate of the grinding wheel are greatly improved; under heavy load, the grinding range condition has wide adaptability, the linear speed is high, and the primary grinding rate is up to 1cm in thickness, so that the difficulty that the traditional grinding wheel can not be suitable for heavy load grinding of steel billets and steel material is better solved, and the need of increasing development of the steel industry is met.

The invention discloses a preparation method for a lubricating oil composition containing ionic liquid, modified nanometer copper powder and graphene. The method comprises the following steps: compounding base oil, a detergent, a dispersant, a preservative, an extreme-pressure antiwear agent, an oiliness agent, an antioxidant, a viscosity index improver, an antirusting agent, a depressant, an antifoamer, the ionic liquid, the modified nanometer copper powder and the graphene so as to obtain the lubricating oil composition containing the ionic liquid, the modified nanometer copper powder and the graphene. The method in the invention has the advantages of simple and practicable production process, small equipment investment and low energy consumption, is pollution-free to the environment and is favorable for popularization and application. The lubricating oil composition prepared by using the method in the invention can be widely applied in the industrial fields of mechanical industry, automobile industry, precision instruments, electric power industry, metallurgy industry, die manufacturing and application industry, iron and steel industry, machine tool industry, etc., and has broad application prospects.

The invention discloses a preparation method of a lubricating oil composition containing ionic liquid, modified nano-zinc powder and graphene. According to the method, base oil, a cleaning agent, a dispersing agent, a preservative, an extreme pressure anti-wear agent, an oiliness agent, an antioxidant, a viscosity index improver, an anti-rust agent, a pour point depressant, an antifoaming agent, ionic liquid, modified nano-zinc powder and graphene are adopted for compounding to obtain the lubricating oil composition. The method has the advantages of simple and easy production process, low equipment investment, low energy consumption and no environmental pollution, and is conductive to popularization and application. The lubricating oil composition product containing the ionic liquid, modified nano-zinc powder and graphene can be widely applied in the industrial fields of mechanical industry, automobile industry, precision instruments, power industry, metallurgical industry, mold manufacturing and application industry, steel and iron industry, machine tool industry and the like, and has broad application prospects.

The invention discloses a method for making vanadium-nitrogen alloy. In the method, vanadium pentexide is ground and added with iron powders, carbon powders and binding agent and evenly mixed, making a ball; the ball is sent in a horizontal type push plate kiln which is filled with nitrogen gas, and the slightly positive pressure in the kiln is always kept; the ball undergoes carbonization and nitridation reactions in the kiln, and the temperature of the carbonization reaction is between 1350 and 1500 DEG C and the reaction time is 2 to 3.5 hours, and the temperature of the nitridation reaction is between 1000 and 1150 DEG C and the reaction time is 0.5 to 1.5 hours; the ball is gradually cooled, and the vanadium-nitrogen alloy is obtained. Due to the adoption of the technical proposal in which the vacuum equipment is unnecessary, the method lowers equipment cost and simplifies the operation flow; due to the continuous production, the method obviously improves the production efficiency; moreover, according to tests, the nitrogen content of the vanadium-nitrogen alloy made by the method is no more than 16 percent, so that the method is more suitable for steel-making requirements in the iron and steel industry.

An iron smelting process by rotating-furnace melt and reduction is carried out by mixing iron-mine powder with powdered coal to obtain self-reduction palletizing, taking it as raw material, pre-reducing by rotating-furnace to obtain metal pellet with conversion rate >80%, heating, packing it into melt gas maker, finally reducing and melting while separating out iron slag to obtain liquefied iron and gas and utilizing it for hot-air furnace and rotating-furnace gas. It has no environmental pollution, and no need for oxygen and natural gas.

The invention relates to a process for simultaneously preparing charcoal, gas, and liquid products with crop stalks and the application thereof. The process is that the crop stalks (rice husk, nut shell, branches of fruit trees, wooden and bamboo waste materials, and the like) are conveyed to a gasification furnace, the gasification furnace is provided with oxygen by the employment of controlling the height of the a batch layer and the air quantity of an air extractor, and the air achieved via gas-liquid separation is conveyed into a gas turbine for generating or directly supplied to users, vinegar fluid is achieved by condensing and reclaiming the liquid, the vinegar fluid can be processed to be antiseptic solution and deodorizer which are used in livestock places, and also can be processed to be pesticide agent or pesticide which can resist insect and disease, further can be used for foliage fertilizer which can promote the growth of crops and has perfect effect in the production of organic vegetable, fruits and agronomic crops. Straw charcoal achieved from imperfect burnt straws is rich in essential nutrients for the growth of crops, which has a long term slow releasing action for water and fertilizer, has improvement and renovation effect for the soil which is polluted and degenerated by heavy metal, and can be processed to be organic compound fertilizer or insulating material of iron and steel industry and the like.

The invention relates to a method for utilizing municipal sludge as a raw material of a steel industrial sintering ore and belongs to the technical fields of harmless treatment and high-additional-value utilization of municipal solid waste. The method comprises the following steps of: mixing the municipal sludge and quicklime according to a ratio; drying and dehydrating the mixture to obtain calcified sludge; adding the calcified sludge into sintering raw materials with correspondingly adjusted components according to a certain ratio and a certain mode, and allowing the mixture to enter the sintering process with other sintering raw materials; and producing the sintering core products serving as iron-making raw materials. The method has the advantages that: the lime calcified municipal sludge is added, so the sludge treatment cost is reduced and the secondary pollution problem during the sludge treatment is solved; the harmless treatment and the recycling utilization of municipal solid waste are realized; and the calcified sludge is added, so that the vertical sintering speed, the finished product ratio and the utilization coefficient can be effectively increased in the process of sintering the sintering core, the added amount of flux and fuel in the sintering raw materials is reduced, the raw material cost is reduced, and multiple purposes are fulfilled.

The invention relates to a technical method for denitration of sintering flue gas. The method is particularly applicable to the treatment of the flue gas generated by sintering of iron ore in the steel and iron industry. The method can be used as the supporting construction for an enterprise with an existing sintering desulfuration technique, and can also be newly established together with a selected mature desulfuration technique of the sintering flue gas. Sintered and desulfurated tail gas is subjected to dehumidification and then used for heat exchanging of high-temperature sintering ore in a ring cooling machine, a straight-line cooler and a vertical-tank type sintering ore cooling device. The heat exchanging tail gas is dedusted and kept at the temperature of 300 DEG C or over. Selective catalytic reduction (SCR) is used for denitration of the tail gas, the removal rate of Nox in the flue gas is 85% or over, and the temperature of the denitrated tail gas is higher than 250 DEG C and can be used for waste heat electricity generation or heat-air sintering of a sintering machine, ignition and combustion supporting, and sintering ore preheating. The technical method for denitration of the sintering flue gas has the advantages that treatment capacity is large, applicability is high, sensible heat of the sintering ore is adequately used, and operating cost is low.

The invention discloses a steelmaking residual heat step recycling method. The invention belongs to the technical field of steel industry iron-making residual heat and residual energy utilization. The method is adopted under a condition for further utilizing iron-making low-grade residual heat, and comprises step recycling and high-efficiency utilizations of blast furnace gas residual heat, dust removal air residual heat, water slag residual heat, hot air furnace low-temperature flue gas waste heat, and dust cover and slag ditch residual heat. According to the technical scheme, blast furnace gas residual heat and dust removal air residual heat obtained after furnace top residual pressure power generation are connected in parallel, and are supplied for domestic water, cooling, or heating. Recycled water slag residual heat and flue gas residual heat obtained after hot air furnace gas heat exchanger are connected in parallel, and are used for supplying a heat source for low-temperature seawater desalination. Recycled dust cover residual heat and slag ditch surface radiation heat are connected in parallel, and are supplied for blast furnace gas supplementary firing residual heat boiler power generation. After powder generation, high-temperature seawater desalination is realized by a steam method. Cooling water and domestic water are treated and are adopted as inlet water replenishment. Through step recycling and graded utilization of the low-grade residual heat and residual energy, steel system comprehensive energy consumption can be reduced to a maximal extent, and energy resource reasonable utilization and comprehensive optimized utilization can be realized.

The present invention provides process of preparing vanadium nitride alloy. The process includes mixing vanadium oxide, carbon powder and density reinforcer, pressing to form, setting the shaped mixture into a reaction furnace, heating to 650 deg.c while introducing nitrogen or ammonia as the reacting and protecting gas into the furnace, further heating to 1000-1250 deg.c to produce carbonizing and nitriding reaction for 3 hr, cooling to 100 deg.c, and discharging the vanadium nitride alloy. The vanadium nitride alloy contains V 73-80 %, N 12-20 %, C 3-8 % and O 0.5-2.0 %, and has apparent density of 3000-4000 kg/cu m. The process has the features of low reaction temperature, short reaction period, low cost, etc, and the prepared vanadium nitride alloy with high nitrogen content is suitable for use in steel making.

The invention discloses a lubricating oil composition and a preparation method thereof. According to the method, base oil, detergent, dispersant, preservative, extreme-pressure antiwear additive, oily agent, antioxidant, viscosity index improver, rust inhibitor, pour-point depressant, antifoaming agent and novel lubricating oil additive are compounded to obtain the lubricating oil composition. The method has the advantages of simple and feasible production technique, low equipment investment, low energy consumption and no environmental pollution, and is beneficial to popularization and application. The lubricating oil composition can be widely used in the fields of mechanical industry, automobile industry, precision instruments, power industry, metallurgical industry, die making and application industry, iron and steel industry, machine tool industry and the like, and has wide application prospects.

The invention belongs to the field of water supply and discharge in the iron and steel industry, and in particular relates to a zero-discharge treatment process for industrial wastewater of an iron and steel industry. The industrial wastewater process is characterized in that: strong brine is subjected to advanced treatment by strong brine treatment process. The strong brine treatment process comprises the following steps that: the strong brine is treated by adopting ion exchange resin to remove Ca2+, Si2+ and other ions which have great influence on film operation, and is subjected to secondary reverse osmosis treatment by adopting a seawater film or a bitter film to furthest reduce the strong brine, and is treated by adopting solidification or low-temperature multiple effect evaporation crystallization. The process saves investment, is convenient for implementation, has clear treatment effect, and can realize zero discharge of the industrial wastewater of the iron and steel plant through source control, strengthening treatment, strong brine reduction, evaporation crystallization and other technology and measures. The process can be widely applied to industrial wastewater treatment for domestic iron and steel enterprises.

The invention relates to a method for recycling metal iron resources from waste residues of the iron and steel industry, particularly relates to a method for recycling metal iron from steel slag of a converter, and belongs to the technical field of benefication and comprehensive utilization of resources. The method includes recycling the metal iron from the slag of the converter by a cascade separation technological method, a dry magnetic separation technological method for discarding tailings and a wet concentration technological method, and is characterized in that +70mm large high-grade steel slag of the steel slag of the converter is in cascade separation and recycling, -70mm large high-grade steel slag is in classification dry magnetic separation for discarding tailings, rough concentration is further in full-grain wet ore grinding for separating slag from iron, cascade screening and cascade magnetic separation, and finally the metal iron with different grain sizes and magnetic iron concentration are obtained. The method has the advantages of high recycling rate and the grade of the metal iron, simplicity in technological process, simplicity and convenience in operation, low production cost, applicability to processing different types of steel slag of converters, and the like.

The invention relates to a system and a method for the centralized classification treatment of steel metallurgic dust mud, which belong to the technical fields of the comprehensive utilization and the innocent treatment of metallurgical industry solid waste. The system comprises an impurity removing system, a homogenizing system, a granulating system and a sintering proportioning system, wherein an outlet of the impurity removing system is connected with an inlet of the homogenizing system, an outlet of the homogenizing system is connected with an inlet of the granulating system, and an outlet of the granulating system is connected with an inlet of the sintering proportioning system; the impurities in high-impurity materials are firstly removed through the impurity removing system, the materials and the rest ferruginous dust mud together enter a mixing system for homogenization treatment, the homogenized materials enter the granulating system for granulation treatment, and the granular materials made by the granulating system enter the sintering proportioning system and are used as sintering raw materials. The system has the advantages of simple and practical technology, large processing capacity, cleanness, environmental protection and lower initial investment and running cost, and fully expresses the ideas of cleaner production and cyclic economy in iron and steel industry.

The invention discloses a harmless and resource utilization method of steel industry chromium-containing wastewater. The harmless and resource utilization method of the steel industry chromium-containing wastewater comprises the following steps: 1) adding steel rolling system acid-washing waste liquid into the chromium-containing wastewater, reducing Cr<6+> in the chromium-containing wastewater into Cr<3+> by utilizing the acidic environment provided by the acid-washing waste liquid and the Fe<2+> therein, and oxidizing the Fe<2+> into Fe<3+>; 2) adding alkali into the reduced wastewater, neutralizing, enabling the Cr<3+> to generate Cr(OH)3 precipitate and the Fe<3+> to generate Fe(OH)3 precipitate, and performing mud and water separation to obtain sludge containing chromium and iron; 3)performing concentration treatment on the sludge containing chromium and iron to obtain homogenous slurry; and 4) feeding the homogenous slurry into a sintering system, mixing the homogenous slurry and the sintering raw materials according to a certain proportion and sintering to obtain a sintered ore finished product for ironmaking and steelmaking. By the method, up-to-standard discharge of the chromium-containing wastewater is realized and resource utilization of the chromium element in the wastewater is realized.

The invention discloses a self-balanced byproduct blast furnace gas dispatching system in the iron and steel industry and a method for predicting a yield and consumption. The self-balanced byproduct blast furnace gas dispatching system comprises a data acquisition subsystem, a blast furnace gas prediction subsystem and a yield-consumption-balanced blast furnace gas dispatching subsystem. The data acquisition subsystem is used for acquiring real-time production data of blast furnace gas, required prediction parameters, production planning data and the like, and the required prediction parameters, the production planning data and the like are used as original data; the blast furnace gas prediction subsystem is used for creating a corresponding prediction model and predicting the yield and the consumption of the blast furnace gas according to the collected original data; the yield-consumption-balanced blast furnace gas dispatching subsystem is used for judging a supply and demand balance condition of a gas quantity according to the yield and the consumption at a future moment and the original gas storage quantity, and producing a balanced dispatching scheme, and the yield and the consumption at the future moment are predicted by the gas prediction subsystem. The self-balanced byproduct blast furnace gas dispatching system and the method have the advantage that the self-balanced byproduct blast furnace gas dispatching system and the method are beneficial to improving the adjustment level of a byproduct blast furnace gas system in the steel and iron industry, improving the blast furnace gas yield and consumption prediction accuracy and dispatching the blast furnace gas in a balanced manner.

The production process of vanadium nitride as one kind of vanadium alloy additive including pre-treatment of mixing of ammonium vanadate powder and carbon powder in a rotary kiln at 600-800 deg.c and slight negative pressure for 2-3 hr; grinding the mixture, mixing with adhesive and pressing into block; treating the blocks inside nitrogen containing protective atmosphere in a vertical tubular kiln at 1100-1900 deg.c for 4-6 hr to produce carbonization and nitridation producing vanadium nitride; and cooling to below 100 deg.c and taking out. The vanadium nitride product contains V in 77-81 wt%, N in 9-16 wt%, C in 2-8 wt% and O in 0.2-1.0 wt% and has apparent density of 3-3.9 g/cu cm, and is suitable for use in making steel.

The invention discloses a liquid molten slag dry-type centrifugal granulation and afterheat recycle system having molten slag buffer-storage and flow control functions. The system comprises a molten slag buffer-storage and flow control unit, a granulation unit, a mobile bed unit and an afterheat utilization unit; the molten slag buffer-storage and flow control unit is arranged at the upper part ofthe granulation unit and is used for buffer-storage of the liquid molten slag and controlling the flow rate and speed of the liquid molten slag falling to the granulation unit; the granulation unit is used for granulating the falling liquid molten slag; the mobile bed unit is arranged at the lower part of the granulation unit and is used for cooling and temporarily storing the granulated molten slag; hot air inside the granulation unit and the mobile bed unit communicates with the afterheat utilization unit; and the afterheat utilization unit comprises a hot air flue, a primary dust collector, an afterheat boiler, a secondary dust collector, an exhaust fan and a chimney which are arranged in sequence. The system disclosed by the invention does not use water resources, is free of environmental pollution, can effectively recycle high-quality afterheat resources contained in the high-temperature liquid molten slag, and can meet the urgent requirements of energy conservation and emissionreduction of the present steel and iron industry.

The invention belongs to the technical field of sludge reduction for cold rolling pickling wastewater in the steel industry, and discloses a method for sludge reduction for the cold rolling pickling wastewater in the steel industry. In the method disclosed by the invention, neutral salt wastewater and wastewater mixed with acid are completely and separately treated to obtain sludge containing hazardous wastes and general sludge respectively, and the sludge output of each unit is reduced by accurately adding chemical agents at each unit; in the technology for treating the neutral salt wastewater, caustic soda liquid is respectively added in a first stage neutralizing tank and a second stage neutralizing tank; in the technology for treating the wastewater mixed with acid, the treatment is performed by using a lime and austic soda liquid combination method; and in the treatment of a neutralizing tank, the pH value is controlled between 1.5 and 3.0, and the pH value during neutralization reaction is controlled between 8.2 and 8.7; and a flocculation process is adopted after the neutralization reaction, polyaluminum chloride, polyacrylamide and other flocculants are added for reacting and are mixed so as to enlarge pollutant particles. By use of the method, the output water can stably reach the standard, and the water treatment cost per ton is reduced.

The invention relates to a method for recycling steel slag of an LF (Low Frequency) furnace. The technical scheme of the invention is as follow: the method comprises the following steps of: removing metallic iron contained in the steel slag through cooling, grinding, magnetic separation and screening processes by taking the steel slag of the LF furnace as raw materials; then mixing modifiers, i.e. sulfur-containing CaO-Al2O3-SiO2-MgO series LF steel slag, a right amount of lime, and the like, and then completely oxidizing sulfur contained in the CaO-Al2O3-SiO2-MgO series LF steel slag or oxidizing to a predetermined degree at certain temperature in an appropriate heating furnace to finally obtain premelting refining slag of the LF furnace, which has excellent property, so as to achieve the purpose of recycling the steel slag in an iron and steel industry. According to the method disclosed by the invention, the recycling of the LF steel slag is completely realized; the environmental problems caused by waste slag stacking are prevented; the consumption of the raw materials, i.e. the lime and the like, is reduced; heat in the production process of the premelting refining slag is effectively utilized; and energy consumption is reduced.

The invention relates to a device for recovering coal gas in the equalizing and relieving process of a furnace top of a blast furnace and belongs to the technical field of the iron and steel industry. The device comprises a blast furnace weighing charging bucket, a equalizing and relieving pipeline connected with the charging bucket, a plurality of types of valves, a cyclone dust collector and a cloth bag dust collector connected in series behind the cyclone dust collector and is characterized in that an ejector is connected in series behind the cloth bag dust collector; crude gas which is equalized and relieved from the blast furnace weighing charging bucket enters the cyclone dust collector to carry out primary dust removal through the equalizing and relieving pipeline and then enters the cloth bag dust collector connected in series behind the cyclone dust collector to form clean gas; and under the action of the ejector, the clean gas is rapidly ejected and enters a clean gas pipe network, so that the rapid relief and recovery of the equalized and relieved coal gas in the weighing charging bucket are realized. The process is simple, is convenient to operate and has low operation and maintenance cost. Besides the economic benefits caused by the recovery of the coal gas, the coal gas and dust discharge can also be reduced so as to generate good social benefits; a conventional process is changed less; and the process is convenient to improve the existing conventional equalized and relieved coal gas system of the blast furnace.