104results about How to "Improve roasting efficiency" patented technology

The invention relates to the production techniques of iron ore concentrate of refractory ore, in particular to a preparation method for producing strong-magnetism magnetite through refractory weak-magnetism oxidized iron ore. The method comprises the following steps that firstly, the crushed iron ore is ground into fine ore; then the fine ore is subjected to low-temperature roasting, and during the low-temperature roasting, the fine ore is made to be in a roasting system to be preheated and roasted; the roasted ore enters a cooling system to be cooled; and then the cooled roasted ore is subjected to size mixing and sent to a magnetic separation system to be separated, and high-grade iron ore concentrate is obtained through separation. According to the method, the process is simple, the temperature and air flow are distributed uniformly, control is easy, the automation degree is high, the number of operation components of equipment is small, refractory siderite and limonite can be treated, the magnetizing roast efficiency of the refractory iron ore is high, heat is substantially recycled during roasting, the roasted ore is stable in quality and high in magnetic separation efficiency, and the technical indexes that the grade of the iron ore concentrate is larger than 60%, and the iron recycling rate is larger than 85% can be achieved.

The invention relates to a method for producing nickel carbonyl powder from nickel hydroxide, belonging to the technical field of powder metallurgy. The method comprises the following steps: adding nickel hydroxide into a rotary roasting furnace, removing water at high temperature, and roasting to obtain nickel oxide; adding the oxide into a hydrogen reducing furnace to perform reduction, thereby generating simple substance active nickel; adding the simple substance active nickel into a nickel carbonyl synthesis reactor to make counterflow contact with CO, and reacting to generate nickel carbonyl gas; delivering the nickel carbonyl gas to a nickel carbonyl decomposer by a blower, and delivering generated nickel carbonyl residues into a nickel carbonyl treater to perform passivating treatment; and decomposing the nickel carbonyl gas in the nickel carbonyl decomposer to produce the nickel carbonyl powder. The invention does not need to perform extra treatment on the raw material, and has the advantages of mild reaction conditions, simple technique, high production safety, low cost, high synthesis efficiency and the like.

The invention relates to a sintering prevention vanadium-containing stone coal microwave roasting method. According to the technical scheme, the method includes: crushing vanadium-containing stone coal into coarse-grained vanadium-containing stone coal with the grain size less than 6mm and greater than 1mm and fine-grained vanadium-containing stone coal with the grain size less than 1mm; adding water to the fine-grained vanadium-containing stone coal to be mixed according to the mass ratio of the fine-grained vanadium-containing stone coal to the water of 1:0.06-0.09 to produce small balls 3-8mm in grain size and drying the small balls; placing the dried small balls in an industrial microwave roasting device as bedding materials, placing the coarse-grained vanadium-containing stone coal on the bedding materials prior to microwave roasting, and cooling to indoor temperature to obtain vanadium-containing stone coal roasting materials, wherein the microwave roasting is characterized in that the temperature rate ranging from 25 DEG C/min to 55 DEG C/min is increased rapidly to the temperature rate ranging from 750 DEG C to 850 DEG C, 25-40 min constant-temperature microwave roasting is performed, and the industrial microwave roasting device is 2400 to 2500 MHz (megahertz) in frequency. With the method, sintering during microwave roasting of the vanadium-containing stone coal is obviously reduced, and the effect of microwave roasting is good.

The invention discloses a fluidized bed furnace device for circularly roasting molybdenum concentrates, which comprises a fluidized bed furnace, a dust collection system, a flue gas recycling system, an air supply system, a feeding system and a discharged-material packing automation system, wherein the discharged-material packing automation system is connected to a discharge outlet of the fluidized bed furnace; the dust collection system and the feeding system are both connected to a feed inlet of the fluidized bed furnace; the air supply system is connected to an air chamber of the fluidized bed furnace, and is composed of a Roots blower, a heating facility and a facility capable of indicating and controlling the pressure and air inflow volume in the air chamber; and the feeding system can uniformly and continuously feed molybdenum concentrates with sizes of 20-200 meshes into the fluidized bed furnace according to a given amount. The invention also discloses a method for using the fluidized bed furnace device for circularly roasting molybdenum concentrates, through which molybdenum concentrates are in full contact with enough oxygen, so that an effect of supplying heat without using an external heat source in the roasting process of molybdenum concentrates is achieved, and high-dissolubility molybdenum oxides of which the soluble molybdenum content is greater than 98% can be efficiently produced, therefore, the method is storing in production capacity; and the concentration of SO2 in roasting in flue gas can reach 4%.

The invention belongs to the field of firing and wet comprehensive smelting of rare earth ore and particularly relates to a method for separating and producing rare earth from iron-containing rare earth raw ore. An iron bead product and a rare earth product are obtained through steps as follows: grinding, mixing, agglomerating, distribution in a rotary hearth furnace, smelting separation in the rotary hearth furnace, roasting, water leaching and the like. Under the condition of relatively lower cost, production efficiency and rare earth leaching rate are greatly increased.

The invention discloses a method for comprehensively recovering lead, zinc and iron in gas ash of a blast furnace. Anthracites of 20-30% of the total mass of blast furnace gas mud are fed in the blastfurnace gas mud containing lead, zinc and iron, and roasting accelerants of 4.0-6.0% of the total mass of the blast furnace gas mud and compounded by Na2CO3 and CaCO3 are fed; the materials are uniformly mixed and fed in a rotary kiln or a rotary hearth furnace, with a smoke recovery system, for reduction roasting; gas is extracted to feed in the smoke recovery system for treatment; mud settlingproducts containing lead and zinc are collected; roasting ores discharged from the rotary kiln or the rotary hearth furnace are quenched by water; and the water-quenched materials are fed in an ore grinding-weak magnetic separation recovery system to obtain iron concentrate powder. The method can synchronously realize the zinc volatilization rate of above 95% and the lead volatilization rate of above 86%, obtains iron concentrates with the grade of above 65.00%, not only can effectively recover lead, zinc and iron resources in the gas ash, but also can reduce the energy consumption, and improves the productivity.

The invention relates to a method for fluidized roasting of stone coal in one step. According to the technical scheme, a fluidized-bed roaster for roasting the stone coal in one step is adopted for roasting; stone coal crushing materials are fed into a roaster body (10) from a feeding inlet (8); the feeding amount and the wind speed of an air port (7) are regulated so that the stone coal crushing materials are distributed in a first fluidized bed (1), a second fluidized bed (2) and a third fluidized bed (14) according to different size fractions; the blast volumes of a first fan (19), a second fan (20) and a third fan (21) are adjusted to regulate the height of a material layer; the coal gas volumes of a first coal gas burner (4), a second coal gas burner (5) and a third coal gas burner (13) are adjusted to regulate a roasting system; after roasting finishes, roasted materials in the first fluidized bed (1), the second fluidized bed (2) and the third fluidized bed (14) are respectively discharged from a first discharge port (19), a second discharge port (20) and a third discharge port (26) and are combined to obtain the stone coal roasted materials. The method has the characteristics of strong material adaptability, simple operation, high yield of the roasted material, high roasting efficiency and high energy utilization rate.

The invention relates to a fluidization roasting technology for processing iron ores and belongs to the technical field of mineral processing. The fluidization roasting technology for processing the iron ores is characterized in that iron ore particles are continuously fed into a reduction reactor from the lower portion of the reduction reactor, reductive mixed gas flow entering the reduction reactor from the bottom of the reduction reactor is used for carrying the iron ore particles to move upward, and roasting is conducted on the iron ore particles at 500-600 DEG C; after roasting, the obtained solid material is continuously discharged out of the reactor via a material outlet on the upper portion of the reactor, a magnetic field is exerted to the reduction reactor at the same time, the intensity of the magnetic field is 40-60 kA/m, and the direction of the magnetic field is vertically upward. According to the fluidization roasting technology for processing the iron ores, the stable magnetic field is exerted around the reduction reactor, the flowing behavior of magnetic particles in the reactor is reasonably controlled, the gaseous-solid two-phase flow in the reactor is more stable, the gas is fully reacted with the iron ores, and the roasting efficiency is improved.

The invention relates to continuous parching equipment which comprises a rack, a feeding mechanism, a parching mechanism, a discharging mechanism and an oil stain separation and collection device. The parching mechanism is mounted above the rack, the feeding mechanism and the discharging mechanism are arranged at the feeding end and the discharging end of the parching mechanism respectively and communicated with the parching mechanism, and the parching mechanism comprises a roller and a heating element. The roller comprises an inner barrel and an outer barrel arranged outside the inner barrel in a sleeving mode, a closed air channel is formed between the inner barrel and the outer barrel, and the heating element is arranged in the air channel. An air inlet of the oil stain separation and collection device is communicated with the interior of the roller, an air outlet of the oil stain separation and collection device is communicated with the air channel, and high-temperature smoke generated in the roller is purified through the oil stain separation and collection device and then is subjected to secondary heating through the air channel to be guided back to the roller. In the seed parching process, cyclic utilization of heat is achieved, it is guaranteed that the equipment is free of emissions, the production environment can be clean, and the aims of saving energy and reducing emissions are achieved.

The invention discloses a method for paving a roasting medium in an aluminum electrolysis cell and a method for roasting a lining of the aluminum electrolysis cell. The method for paving a roasting medium in an aluminum electrolysis cell comprises the following steps of: placing a fence frame in an anode orthographic projection area of the aluminum electrolysis cell; filling the fence frame with a roasting medium, wherein the roasting medium contains scorched particles and graphite; and after leveling the surface of the roasting medium, removing the fence frame. Through the invention, the roasting medium can be effectively paved in the aluminum electrolysis cell.

The invention discloses a method for producing sodium chromate and co-producing chrome cast iron by a three-stage process through un-calcium roasting, aiming at solving the problems of low roasting efficiency and high energy consumption in the existing method for producing chromic salt by un-calcium roasting. The method for producing sodium chromate by the three-stage process through un-calcium roasting comprises the following steps of: A, mixing roasting material in a first stage, mixing chromite and sodium carbonate in proportion; B, roasting in the first stage, putting the mixed material in the first stage into a rotary kiln and performing oxidizing roasting; C, leaching and filtering in the first stage; D, performing second-stage roasting technology; and E, performing third-stage roasting technology. The leaching of clinker after roasting for three times is same as the roasting leaching in the first time and the second time, the grinding leaching is performed to the clinker by a wet grinding ball mill, the clinker is filtered by a belt type filter and the filtered chromium slag by three-stage roasting is obtained by filtering of the belt type filter, the filter liquor is sodium chromate alkali solution. Compared with the traditional un-calcium roasting technology, the method in the invention adopts the three-stage process un-calcium roasting technology and effectively reduces the mine consumption and the alkali consumption and has the energy-saving and emission-reducing effect.

The invention discloses an ore continuous bake furnace, which can solve the defects of hearth-furnace and revolution furnace that short bake time and lower weight when continuously baking colorful metallic ore, as vanadic anhydride. Wherein, the hearth comprises a material feeder 12; two sides of bake furnace are distributed with burning furnace 2; the middle of bake furnace is mounted with a material mixer 5; the arc top of furnace 1 has an incline oxygen ejector 4. The invention can realize bath and automatic production, with high baking efficiency, while it can bake vanadic anhydride and other metallic ores.

The invention relates to the technical field of agricultural machinery, in particular to folium mori tea preparation equipment. The folium mori tea preparation equipment comprises a drum type stir-frying machine and an adjustable folium mori cutting machine, wherein the adjustable folium mori cutting machine comprises a stir-frying furnace, an arc-shaped heating plate, a spiral stirrer, a cuttingbox, duplex horizontal distance regulation devices, a first cutting disk component, a second cutting disk component, a reciprocating type blade cutter and a meshing transmission element, wherein the stir-frying furnace is aslant arranged on a bottom plate, is provided with an observation window and is also provided with a material outlet; the arc-shaped heating plate is coaxially arranged on the bottom side of the stir-frying furnace; the working end of the spiral stirrer is coaxially rotatably arranged in the stir-frying furnace; the upper end and the lower end of the cutting box are independent provided with a material inlet and a material falling hole, and the cutting box is arranged on the top of one end, with a horizontal plane, of the stir-frying furnace; the duplex horizontal distance regulation devices are arranged on two sides of the cutting box; the first cutting disk component and the second cutting disk component are arranged on the duplex working ends of the horizontal distance regulation devices; the incision of the reciprocating type blade cutter is horizontally arranged on the bottom of the cutting disk component; and the meshing transmission element and two ends ofthe cutting disk are coaxially fixedly connected. According to the device, Morus alba L. leaves can be automatically cut and stir-fried, and efficiency is high.

The invention discloses a rotary kiln. The rotary kiln comprises an inclined rotary kiln barrel, a kiln head arranged at the head portion of the rotary kiln barrel, a kiln tail arranged at the tail portion of the rotary kiln barrel, and a transmission device driving the rotary kiln barrel to rotate, wherein the kiln tail is higher than the kiln head, a burner is arranged inside the kiln head, anda feeding inlet and a smoke outlet are formed in the kiln tail. The rotary kiln is characterized in that refractory brick layers are piled on the inner wall of the rotary kiln barrel and at least comprise material flying structures formed by arch-shaped protrusions which protrude to the inner wall of the barrel in the axial direction of the barrel; and the arch-shaped protrusions of the material flying structures protrude out of the surfaces of the refractory brick layers on the side face. Materials inside the kiln are evenly roasted, the breakage rate of products can be reduced, the product performance is greatly improved, the heat exchange area between the products and hot airflow inside the rotary kiln barrel is increased, and the roasting efficiency of the haycite products is effectively improved.

The invention discloses a pellet roasting system based on a sintering machine. The system comprises the sintering machine, a circular cooler, a circulating air flow unit and a flue gas treatment unit. A discharge port of the sintering machine is connected with a feed port of the circular cooler. The circulating air flow unit is arranged among the sintering machine, the circular cooler and the flue gas treatment unit. A smoke hood is arranged above the sintering machine, and an air bellow is arranged below the sintering machine. According to the trend of materials, the smoke hood located above the sintering machine is sequentially divided into a preheating section, a combustion section and a roasting section. The sintering machine is adopted for pellet roasting, meanwhile, an air flow system is improved, the flue gas circulation heat utilization rate is increased, energy consumption is reduced, meanwhile, the roasting effect is improved, meanwhile, the good cooling effect can be achieved, generation of nitric oxide is reduced through gradient heat compensation, the desulfurization and denitrification cost is reduced, and the environment is protected.

The invention relates to a fluidized baking device, and belongs to the technical field of mineral processing. The fluidized baking device comprises a reduction reactor perpendicular to the ground, anda magnetic field generation device acting on the reduction reactor, wherein a magnetic field generated by the magnetic field generation device is perpendicular to an upward uniform magnetic field; the main body of the reduction reactor is a columnar cavity container; a gas inlet is formed in the bottom of the container; a gas distribution plate with the edge fixed on the side wall of the bottom of the container is arranged in a cavity; the cavity between the gas distribution plate and the gas inlet is a gas distribution chamber; a material inlet is formed in the side wall above the gas distribution plate; a gas outlet is formed in the top of the reduction reactor container; and a material outlet is formed in the side wall of the upper part of the reaction reactor container. By adding a stable magnetic field on the periphery of the reaction reactor and reasonably controlling the flow behavior of magnetic particles in the reactor, the gas-solid two-phase flow in the fluidized baking device is relatively stable, gas and iron ores are fully reacted, and the baking efficiency is improved.