1235 results about "Rotary furnace" patented technology

The invention discloses a process for integrally heated continuous preparing biomass pyrolysis gasification gas and a rotary furnace utilized by the same. At a furnace tail cooling section, red charcoal at a temperature of 600-800 DEG C after pyrolyzing and destructive distilling reacts with steam generated by cooling spray water on the lower portion in the furnace so as to absorb large quantities of heat and simultaneously generate water gas and semi-water gas. Heat generated by burning recycled gas and air is used for maintaining pyrolysis temperature of biomass material layers and providesenough heat for further, pyrolysis, destructive distillation and steam decomposition reaction. By aid of the heat, biomass inside the furnace is pyrolyzed and destructively distilled to generate large quantities of volatile matters, and the biomass is gradually heated to decompose destructive gas with high heat value. The rotary furnace utilizes a three-section design: a first section is a furnace head preheating section, which is mainly used for preheating and drying raw materials, a second section is a rotary furnace body pyrolysis section, which is mainly used for pyrolysis and destructivedistillation and is a core operation portion of the furnace, and a third section is a furnace tail cooling section, which is mainly used for cooling charcoal. Prepared gas is high in heat value, and devices occupy small space.

The invention relates to a method for making mica paper by reinforcement of aramid short fiber and chemical pulping. The method comprises the following steps: cleaning mica flakes to remove impurities; putting the mica flakes to an intermittent heating rotary furnace for calcination to remove a part of crystal water in the crystal of mica and generate remarkable expansion and delamination along the vertical direction of a cleavage plane so as to make the mica loose and flexible; dipping the mica in acid or alkali solution at a certain concentration, delaminating into mica sheets, and classifying the mica sheets into chemical mica pulp with certain beating degree; and adding 3 to 15 percent of aramid fiber (based on the mass of the mica flakes) into the pulp, preparing mica aramid pulp, and making the mica aramid pulp into paper by a paper machine. The framework effect of the aramid improves the strength of the mica paper.

The invention provides a steel plate for a high-strength high-toughness low-yield easily-welding structure. The steel plate comprises the following chemical components in percentage by weight: 0.02 to 0.08 percent of C, 0.30 to 0.50 percent of Si, 1.50 to 1.80 percent of Mn, 0.02 to 0.04 percent of Nb, 0.005 to 0.030 percent of Ti, 0.008 to 0.20 percent of Mo, 0.30 to 0.90 percent of Cr, 0.30 to 0.50 percent of Cu, 0.10 to 0.40 percent of Ni, 0.010 to 0.070 percent of Als, and the balance of Fe. The method for manufacturing the steel plate comprises the steps of molten iron pretreatment, rotary furnace smelting, refining, continuous casting and rolling, wherein the steel blank heating temperature before rolling is between 1,050 and 1,220 DEG C, the rolling temperature in a recrystallization area is more than or equal to 1,000DEG C, and the rolling temperature in a non-recrystallization area is between 950 and (Ar3 plus 0 to 100) DEG C; and after rolling, the temperature is held, and the plate blank is subjected to accelerated cooling. The method has the advantages of unnecessary addition of B and V, low cost, short production period, and the obtaining of the bainite plus ferrite structure without complex thermal treatment, and can control the yield of the steel plate below 0.8 under the condition of ensuring high strength, high toughness and good welding property.

The invention discloses a method for producing high-strength low-carbon bainite steel based on thin slab continuous casting and rolling process. The method includes the following steps: melting by using a rotary furnace or an electric furnace, refining molten steel in an LF furnace after the component analysis, performing the composition adjustment, continuously casting thin slabs, directly heating the thin slabs at the temperature of 950-1100 DEG C in a roller-hearth heating (soaking) furnace at a temperature not less than 1150 DEG C, controlling the tapping temperature of heated thin slabs in a range from 1050 DEG C to1160 DEG C, rolling by using a continuous rolling mill to produce plates, finishing at a temperature of 840-860 DEG C, performing laminar cooling, and coiling with a down coiler at a temperature of 550-600 DEG C to produce the steel coil. The method can produce non-tempered high-strength steel based on thin slab continuous casting and rolling process, and has the advantages of simple metallurgical composition of steel, low cost of alloying production, and stability in high toughness and good forming and welding properties of the steel coil.

A comprehensive utilization method of high-ferrum and low-grade bauxite belongs to the technical of metallurgy and is carried out according to the steps as follows: a large proportion of aluminium oxide is extracted through a Bayer process technology that excess lime is added, produced low-alkali red mud is pre-reduced through a coal-based rotary furnace process technology, then high-temperature melting separation of aluminium slag/ferrum is realized by adopting a ferrum bath oxygen coal jetting technology, formed aluminium slag generates calcium aluminate cement after being quenched and tempered, calcium aluminate cement slag is leached with low sodium carbonate solution, a part of leached crude solution and digestion slurry by the Bayer process are mixed and enter a Bayer process system to extract aluminium oxide, and the other part is desilicated and then is resolved in a carbonation manner, aluminum hydrate, which is the decomposition product, is conveyed to the Bayer process system as seed crystal, and resolved mother liquid is used for leaching calcium aluminate cement slag after being mixed. The method provided by the invention can not only ensure efficient dissociation extraction of ferrum and aluminium, but also be practicable in technology and economic benefit, thereby comprehensively utilizing high-ferrum bauxite resource of China effectively.

The invention discloses a coil rod for a pre-stressed steel strand and a production method of the coil rod. The production method comprises the following steps: smelting in a rotary furnace; refining in an LF; continuously casting; heating; carrying out controlled rolling and controlled cooling. In the continuous casting step, a casting blank consists of the following chemical components in percentage by weight:0.78-0.82 percent of C, 0.20-0.25 percent of Si, 0.75-0.80 percent of Mn, 0.20-0.25 percent of Cr, smaller than or equal to 0.012 percent of P, smaller than or equal to 0.010 percent of S and 0.02-0.03 percent of V. The controlled rolling and controlled cooling step comprises steps of rolling, spinning, cooling and collecting and coiling; in the rolling step, the rolling temperature is 1000+/-15 DEG C; the precision rolling temperature is 920 to 950 DEG C; in the spinning step, the spinning temperature is 860 to 880 DEG C. According to the method, based on optimization and control of the chemical components, by regulating and controlling the steel rolling process, the sorbite rate of the coil rod is increased, the interlamellar spacing of the sorbite is reduced, and generation of poor tissues is avoided, so that the coil rod has the characteristics of high intensity, high plasticity and low pole difference and satisfies the use requirement that the wire is not broken at a high-pulling speed; the pulling speed is increased; the wire breaking rate is reduced; therefore the production efficiency is improved to some degree.

The invention relates to a technique method for producing lithium iron phosphate material in a vacuum rotary kiln. The invention relates to the industrial manufacturing of lithium ion battery cathode material, which is characterized in that: a continuous vacuum rotary kiln is adopted to sinter and produce lithium iron phosphate material, which realizes dynamic sintering. The invention solves the difficulties of material overburning, underburning, etc. appeared in static sintering in atmosphere protection pusher kiln, pit type furnace, etc. The rotary kiln comprises a screw-feeder, a hopper, a feeding bin, an inlet bin, a rotary barrel body, a receiving bin, a discharging bin, a furnace body, an air inlet, an air outlet and pumping port, a large gear outside the barrel body, a drive gear engaged with the large gear and a roller, etc. The material is continuously fed and discharged. Spiricle is arranged in the barrel body of the rotary kiln and the material goes forward sequentially in the barrel body. The furnace body of the outside furnace of a rotary furnace is sealed, the air is vacuumized and protection atmosphere is input. The technique line is burdening, mechanical strength grinding, mixing, milling and crushing, pressing pill, sintering in the vacuum rotary kiln, mechanical strength grinding, ball grinding, coating, conductive carbon, testing and packing. The lithium iron phosphate material produced by the invention has low energy consumption, high efficiency and good product quality.

The invention relates to a multi-tube external-heat fume reverse extraction rotary carbide furnace which is provided with an obliquely horizontal type rotary furnace body (1); the high end side of the furnace body is provided with a feed hopper; the lower end side of the furnace body is provided with a discharge hole (14) and a combustion chamber (2); tube bundles (9) which are annularly distributed along a cross section are arranged in the furnace body; carbonized materials and fume channels are isolated, wherein the tube pass is used for the carbonized materials and the shell pass is used for fume. The invention adopts a tubular carbonizing process, which separates heat generated by the carbonized materials and fuels and avoids the problem of excessive carbonization; moreover, the problem that coal tar in a volatile matter is stuck to the surfaces of the carbonized materials again to influence the appearance of the product and activating effect when the fume is reversely sucked back.

The invention discloses continuous rotary biomass pyrolytic charring and boiler heat supply integrated equipment. The equipment comprises raw material conveying equipment, a rotary drying furnace and a rotary charring furnace, and is characterized in that: the raw material conveying equipment is connected with the rotary drying furnace and connected with the rotary charring furnace through a star-like feeder; a material which is pyrolytically charred by the rotary charring furnace is discharged through a charred material outlet; the rotary charring furnace comprises a hearth and a rotary furnace; one path of high-temperature hot gas produced by combustion of an oxygen-containing combustion chamber is conveyed into the hearth of the rotary charring furnace through a flue to enter a charring section; the rotary furnace comprises a barrel, an inner heating tube and a baffle ring; one end head of the inner heating tube is fixed on the barrel wall on one side and passes through the baffle ring to be fixed on the barrel wall on the other side of the baffle ring; after the high-temperature hot gas passes through the hearth through the flue, certain high-temperature hot gas enters one end head of the inner heating tube, is discharged out of the other end head of the inner heating tube, enters a waste heat conveying pipe and is conveyed into the rotary drying furnace through an induced draught fan; and the high-temperature hot gas is conveyed into a biomass boiler through another flue. The equipment can improve the working efficiency of the rotary charring furnace.

The invention discloses a rotary furnace which is cylindrical, a charging opening which is horizontally arranged is opened on the rotary furnace; a slag hole and a copper discharge opening are opened on a furnace body; a hole for mounting a burner is opened on an end cover of the furnace body; a vent hole is radially opened on the other side of the end cover of the furnace body with the hole for the burner; an oxidation and reduction air port is opened on the furnace body; a support is arranged at the lower part of the furnace, and the furnace body can be rotated on the support. The process for processing mixed copper or block-shaped crude copper by utilizing the rotary furnace adopts heavy oil, natural gas, pulverized coal and other fuels, oxygen can also be added for combustion for providing a heat source for melting solid copper materials, compressed air is taken as an oxidant, quartz sand is taken as a flux, the impurities are removed by oxidation and slagging, then the natural gas or LPG, etc., is introduced for reduction, thereby producing anode copper; flue gas is introduced into a secondary combustion and waste heat boiler for carrying out waste heat recovery, cooling and dust collection by a smoke cover. The rotary furnace has the advantages of high thermal efficiency, energy conservation, good environmental protection effect, high degree of automation and mechanization, safe operation, relatively low investment, but no no black smoke pollution, etc., thereby being particularly applicable to large and medium-sized mixed copper refineries for use.

The invention relates to a production method of recycled aluminum. The production method comprises the steps: classifying and stacking waste aluminum or aluminum ash slag, then separating, wherein the separation is to remove dirt by washing and crushing; removing steel by a magnetic separation method, then crushing the initially purified aluminum, sieving to obtain a mixed aluminum powder, then putting into a rotary furnace for a combustion reaction, so as to decompose the aluminum slag or the waste aluminum into aluminum liquid and aluminum ash; putting the aluminum liquid in a refining furnace for further smelting, to obtain aluminum liquid with relatively high purity, outpouring to form aluminum ingots, wherein the pure aluminum content can reach 99.99%; and merging the aluminum ash unloaded from the rotary furnace with aluminum ash obtained by treating flue gas through a cyclone dust extractor, wherein the content of aluminum in the residues is 1-3%, then packaging, and providing the packaged product as a smelting additive for a steel mill.

The invention provides a method for improving quality of brown coals with an externally heated rotary furnace. The method comprises the following steps: drying and desorbing a raw material brown coals at a temperature of 100 DEG C to 300 DEG C in a rotary drying furnace; thermally cracking the dried and desorbed brown coals in a rotary carbonization furnace; heating and keeping the brown coals at a temperature of 450 to 700 DEG C through hot air from an outer jacket for thermal cracking for 40 min to 2 h; as for semi coke obtained after thermal cracking, quenching the resultant semi coke in a rotary cooling furnace and allowing the semi coke to pass through a screening device so as to obtain a finished product of semi coke with different particle sizes; as for high temperature crude coal gas containing tar obtained after thermal cracking, allowing the resultant high temperature crude coal gas containing tar to pass through a tar separating and purifying device so as to obtain a finished product of tar with high quality and a finished product of coal gas with a high calorific value, delivering one part of the finished product of coal gas and air into a combustion furnace for combustion, and delivering the combusted hot flue gas back to the jacket of the rotary carbonization furnace as a heat source. The invention enables the utilization rate of the raw material brown coals and the available value of the coal gas to be improved and treating capacity of a purifying device for coal gas to be reduced; dry quenching of coke is employed and the discharge of the coke is continuous, thereby improving the quality of semi-coke, saving energy and reducing generation of harmful gas.

The invention discloses a method for pyrolyzing coal in a regenerative rotary furnace, which is to distribute a certain amount of raw materials to be pyrolyzed into the bottom of the rotary furnace through a distributing device after being crushed, screened and dried, and adopts the method of radiation Heat to 400-700°C without air, and keep for 30-120 minutes. After the dry distillation gas from the top of the rotary furnace is separated from oil and gas, tar and crude gas are obtained. The solid product discharged from the bottom of the rotary furnace through the discharge device is cooled to obtain semi-coke. The method of the invention has simple process, high efficiency, does not need gas or solid heat carrier, and is suitable for coal types of various qualities.

The invention relates to a comprehensive recovery method of iron, vanadium and titanium for vanadium and titanium magnetite concentrated ores, in particular to the comprehensive recovery and utilization of the vanadium and titanium magnetite concentrated ore of which the vanadium content is higher. In particular, the invention is vanadium extraction through water immersion after the vanadium and titanium magnetite concentrated ore is performed with sodium activation and sintered, the vanadium product is made from leach solution, the remaining slag is performed with reduction quickly through a rotary furnace after carbon is added, the reduction product is melted through the electric furnace, to segregate the melted iron and the titanium slag, the melted iron is used to make steel, and the titanium slag is used to produce white titanium pigment through a sulfuric acid method titanium white technology. The method of the invention is applied to the refining technology of the vanadium and titanium magnetite concentrated ore, to ensure that the recovery rate of the vanadium and titanium is greatly enhanced, the recovery rate of the total vanadium in the iron concentrated ore can reach more than 80 percent, titanium is fully recovered, and the production of massive blast furnace slag is avoided.

The invention discloses high-tenacity high-strength spring steel which is characterized by comprising the following chemical components in percentage by weight: 0.35-0.50% of C, 1.50-2.50% of Si, 0.35-1.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.50-1.20% of Cr, 0.15-0.50% of Ni, 0.10-0.30% of Cu, 0.04-0.10% of V, 0.03-0.10% of Ti and the balance of Fe and other inevitable impurities. The spring steel is smelted through an electric furnace or rotary furnace, an external refining technology is adopted to control the contents of gas and impurities, the gas O in the steel is less than or equal to 12ppm, H is less than or equal to 1.5ppm, N is less than or equal to 60ppm, the fine system of each of levels A, B, C and D of non-metallic inclusions is less than or equal to 1.5, and the rough system is less than or equal to 1.0. The grain size of the material after heat treatment is more than or equal to 8.0; the reduction of area Z is more than or equal to 40% and the percentage elongation after fracture is more than or equal to 10% when the tensile strength is more than 1920MPa; a prepared spring has excellent corrosion and fatigue resistance, and the steel can be prepared into high-fatigue-strength springs of which the maximum design shear stress is 1180MPa.

The invention discloses a non-crystal low-manganese and low-sulfur pure ion and manufacturing method, which comprises the following parts: 0.03-0.07% C, 0.10-2.0% Si, 0.03-0.06% Mn, not more than 0.02% P, not more than 0.005% S, not more than 0.02% Al, not more than 0.008% Sn and not more than 0.01% Ti. The manufacturing procedure comprises the following steps: adopting melted iron to predispose; reducing S content in the melted iron; blowing in the rotary furnace; removing carbon and manganese through double-slag method or multiple slaggings; proceeding LF refining; casting in the square blank; using FeSi, Al or individual Al to predeoxidize; blowing and stirring in the whole procedure; dispersing through ferrosilicium and rankinite to deoxidize and desulfurize deeply; reducing Al; heating; feeding calcium line after stirring; casting; obtaining iron blank.

The invention discloses 35MnB steel which comprises the following components in percentage by weight: 0.33-0.36 percent of C, 0.20-0.30 percent of Si, 1.20-1.40 percent of Mn, not more than 0.30 percent of Cr, not more than 0.025 percent of S, not more than 0.025 percent of P, not more than 0.20 percent of Ni, not more than 0.20 percent of Cu, 0.015-0.035 percent of Ti, 0.005-0.0030 percent of B, 0.015-0.035 percent of Al, not more than 20*10<-6> percent of [O] and not more than 35*10<-6> percent of [N], wherein the components are smelted in a rotary furnace, subsequently smelted in an LF ladle furnace, then subjected to RH vacuum degassing and finally cast continuously to obtain an ingot blank. The energy consumption cost for producing the type of steel is lowered fundamentally; loss of an element B of the 35MnB steel is reduced; the yield of ferroboron during a steel smelting process is increased; the stability of hardenability of the 35MnB steel can be improved; in addition, by adopting low superheat degree, electromagnetic stirring and a constant-temperature and constant-speed casting process, segregation of the elements such as C and Mn is alleviated, the components are more uniform and the fluctuation of the hardenability is alleviated.

The invention provides a method for producing glass beads used for curing high-level nuclear wastes. The method comprises the following steps of: uniformly mixing raw materials, melting the raw materials into glass solution by using an all-electric glass melting furnace at the temperature of between 1,300 and 14,000 DEG C, clarifying and homogenizing the glass solution for 5 to 8 hours, cooling the glass solution to obtain glass block green bodies, and preparing glass blocks by specifications of finished products from the obtained glass block green bodies; uniformly mixing each 100 parts of the obtained glass blocks with 10 to 25 parts of charcoal powder and 1 to 3 parts of carbon black, and throwing a mixture into a glass bead electrothermal rotary furnace, of which the running speed is 20 to 30 revolution per minute, at a speed of 0.7 to 1.0 kilogram per minute at the temperature of between 850 and 940 DEG C through the glass bead electrothermal revolving furnace, and rolling the mixture to form a ball-shaped mixture; and finally annealing and cooling the ball-shaped mixture to obtain the glass beads used for curing the nuclear wastes. The glass beads used for curing the high-level nuclear wastes produced by the method has ideal high-temperature viscosity, high mechanical strength and high anti-crystallization performance.

This invention relates to a tilting rotary secondary aluminum smelting furnace. It includes roller type rotary furnace body, which is supported on the steel support. The anterior end of rotary furnace is arranged in the sleeve. The anterior end face of the rotary furnace has round furnace opening. The posterior end of rotary furnace connects to power device. The steel support corresponding to the rotary furnace posterior end parts connects to lifting cylinder. The steel support corresponding to the rotary furnace anterior end part connects to supporting shaft. There is round furnace door corresponding to the round furnace opening. There is sealing ring between the round furnace opening and door. The round furnace door is arranged on the roll-over shaft and connects to controlling oil cylinder. The round furnace door has fuel gas combustor and waste air discharging opening. The structure is simple. This invention is convenient. It has low energy dissipation and high producing efficiency.

The invention discloses a carbonization furnace for producing biomass charcoal. The carbonization furnace comprises a smoke tube, a rotary furnace body, a feeding hopper, a discharging hopper and an oil and gas discharging pipe, wherein the rotary furnace body is supported by rotary supporting rollers; the feeding hopper, the discharging hopper and the oil and gas discharging pipe are arranged on the rotary furnace body; the smoke tube is arranged in the rotary furnace body and is coaxial with the rotary furnace body; and the inner wall of the rotary furnace body is provided with helical blades or an angle which is more than 5 degrees and less than 30 degrees is formed between the coaxial line of the smoke tube and the rotary furnace body and the horizontal plane. The biomass charcoal is produced by the following steps that: a biomass material enters the carbonization furnace from the feeding hopper; a motor drives the carbonization furnace to rotate; the helical blades in the furnace stir the material and push the biomass material to move forwards or from top to bottom; the material absorbs the heat of the outer wall so as to evaporate the moisture; and the biomass material is carbonized and discharged from the discharging hopper. The carbonization furnace has the advantages of realizing continuous production, saving the energy resource, improving the production efficiency and reducing the labor intensity, along with simple production process, high efficiency, low labor consumption and low labor intensity.

The invention discloses an abundant generating system used in dry cement product line, comprising a grog cooler, a AQC abundant heat boiler, a cement rotary furnace, a head frame of cement rotary furnace, a third-stage wind tube, a cement preheating device, a cement predissociation furnace, a SP abundant heat boiler, a fan, a deaerator, a condenser, and a generator of turbine. The third-stage wind tube is between the head frame and the predissociation furnace. The head frame is communicated with the grog cooler. The invention is characterized in that third-stage wind tube is arranged with a third-stage wind abundant-heat boiler with bypass wind channels; the medium inlet of the third-stage wind abundant-heat boiler via the tube is connected with the AQC abundant-heat boiler and the SP abundant-heat boiler, while the medium outlet is connected with the turbine generator. The invention can completely absorb the abundant heat of product line, to supply overheated steam to the generator, while the electricity generation is higher than 40kwh.

Production of 20MnSi III thread reinforcing bar is carried out by adding blast-furnace iron water and waste steel into oxygen rotary furnace or electric furnace, oxygen-blowing smelting or supply smelting, adding into manganese and reducing agent, slag-excluding and tapping while reaching to 20MnSi standard, adding into defoliant, ferro-silico-manganese alloy or manganese-ferro alloy or ferro-silicon alloy into steel bag sequentially, adding into nitrogen promoter to make nitrogen content 0.008-0.035%, adding into nitride-containing alloy, blowing argon or nitrogen for steel liquid at 0.01-0.10m3/t.min for 2-9mins, rolling at 1050-1300degree, and penetration cooling at 1.5-1.5degree/second. It costs low and has excellent mechanical performance.

The invention relates to a round bland in a new type of steel and a manufacturing process. An oil bushing, in particular P110 high-steel level oil bushing, is used for deep well and environment having complicated layer conditions, and requires higher demand on quality of round tube blank for the oil bushing. At present, there mainly are C-Mn steel serial, Mo-containing steel serial, the C-Mn steel serial are more economical but relatively more inferior in intensity, toughness and metallurgical structure of the steel; the Mo-containing steel serial has good intensity, toughness and high temperature resistance but with cost thereof being increased dramatically. The invention uses a measure that control C content, higher Mn content and adds a particular amount of Cr, which meets the demand of intensity of the steel pipe, and the invention designs new type of steel and the manufacturing process thereof. The main components are (based on weight percent): C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P is not more than 0.025%, S is not more than 0.025%, Al=0.01-0.03%, and Fe in equilibrium amount, diameter of the round blank is 150 to 200 mm; the invention employs the procedures of top-bottom re-blowing rotary furnace-LF refining furnace-VD vacuum refining furnace-round blank continuous caster-turn-over cooling bed-checkup-warehousing.