136results about How to "Improve roasting effect" patented technology

The invention discloses a method for extracting vanadium from a vanadium-containing raw material. The method comprises the following steps: a, uniformly mixing the vanadium-containing raw material, sulfuric acid and/or a sulfate, and water, so as to obtain a mixed material; b, performing aerobic roasting on the mixed material, so as to obtain a roasted clinker; c, performing leaching on the roasted clinker by using a leaching agent, so as to obtain a leaching slurry; and d, performing filtration separation on the leaching slurry, so as to obtain tails and a vanadium-containing solution. The method has relatively strong adaptability on composition variation of the vanadium-containing raw material, and helps to realize economic feasible industrial production and extraction of vanadium by using steel slag, vanadium slag and other vanadium-containing raw materials with relatively high calcium and magnesium content. The method is simple, practicable, low in equipment requirement, convenient to operate, low in material consumption and energy consumption, and easy for industrialization, and has extremely good economic benefit and social benefit.

The invention discloses a production method of a bilayer structure pellet and production equipment thereof, belongs to the technical field of pellet production methods and equipment, and is used for producing a pellet having an inner-layer structure and an outer-layer structure. The technical scheme is that a mineral aggregate easy to generate an adverse effect on the pelletizing process and the roasting process is put in an inner-layer pelletizing disk to serve as a pellet core, and a mineral aggregate with good pelletizing performance and in favor of roasting is put in an outer-layer pelletizing disk to grow to a pellet, so that the pellet with the inner-layer structure and the outer-layer structure is formed, and the influence on the pellet by the adverse effect of the mineral aggregate is prevented. The method and the production equipment are simple in operation, are flexible in parameter adjustment, and can be adapted to a diversified raw material structure; under the condition of shortage of a high-quality iron ore resource at present, the novel production method and the novel production equipment are provided to realize reasonable resource utilization, to improve pellet quality and to guarantee smooth production; and the production method and the production equipment have positive and prominent effects on the sustainable development and the economic benefit improvement of iron and steel enterprises, and have strong promotion and application values.

A grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore comprises the following steps: 1, preparing a combined binder through using clay or bentonite, and industrial magnesium chloride; 2, fragmenting the powdery refractory iron oxide ore, mixing with the combined binder to prepare cold-pressed balls, and sieving; or grinding the powdery refractory iron oxide ore, grading through a strong magnetic process, dehydrating, mixing with the combined binder to prepare the cold-pressed balls, and sieving; or carrying out strong magnetic selection to produce ore tailings, enriching through an ore selection process, dehydrating, mixing with the combined binder to prepare the cold-pressed balls, and sieving; 3, drying materials which cannot pass through a sieve, sieving the dried materials, returning materials which pass through the sieve to a pelletizing operation, sending balls which cannot pass through the sieve to a double combustion chamber shaft furnace to undergo a reduction reaction, cooling, and completing ore grinding and weak magnetic grading through an ore grinding and grading system. According to the technology, a large amount of idle or abandoned low-grade powdery iron oxide ore is recycled, the particle size range of ore roasted in the shaft furnace is enlarged, the shaft furnace magnetization roasting of the powdery refractory iron oxide ore is realized, and the shaft furnace is maximally utilized to complete the ore roasting.

The invention discloses a technology for preparing a ceramic tile from high-volume municipal water supply plant sludge, and belongs to the field of solid waste recycling and building material production in environmental engineering. The technology comprises the following steps of: uniformly mixing 38 to 42 mass percent of municipal water supply plant dewatering sludge powder (dry weight) with a certain grain size, 38 to 42 mass percent of kaolin and 16 to 24 mass percent of potassium feldspar powder, adding water which is about 20 percent based on the dry weight of the total material, uniformly mixing, and storing for certain time in a constant-temperature environment; and performing compression molding under certain pressure, raising the temperature from room temperature to 1,200 DEG C by a certain method and keeping temperature for one hour, and naturally cooling to the room temperature to obtain the finished product. Through detection, the main technical indexes meet the related national standard. By the technology, the water supply plant sludge is effectively utilized, and other brick production raw materials are substituted; and the technology has good environmental benefit and certain economic benefit.

The invention relates to a roasting method for extracting vanadium from vanadium-containing shale. According to the technical scheme of the invention, the method comprises the following steps of: uniformly mixing vanadium-containing shale raw ore with a vanadium-containing shale extraction roasting additive in a ratio of 1:(0.06 to 0.1), feeding the mixture to a roasting furnace, heating to 850 to 1000 DEG C at a temperature rise rate of 400 to 500 DEG C/h, maintaining the temperature for 1 to 2 hours, then adding the roasted product to dilute sulfuric acid with volume fraction of 4 to 10% in a solid-liquid mass ratio of 1:2, and leaching at 90 to 100 DEG C for 0.5 to 1 hour under the condition of stirring. The preparation method of the vanadium-containing shale extraction roasting additive comprises the steps of: preparing Mg compounds, namely NaClO3, Na2CO3 and CaCO3 and mixing uniformly, wherein the mass ratio of NaClO3:Na2CO3:CaCO3 is 1:1:(4 to 8):(6 to 10); and grinding until the particle size is not more than 0.15 mm. The method provided by the invention increases the leaching rate up to 86% to 87% and has the characteristics of high recovery rate, short roasting period, high leaching speed and little roasting pollution.

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 flame roasting direct-on starting process of an aluminum electrolysis cell, comprising the following steps in sequence: selecting an electrolysis cell, installing the electrolysis cell, installing a gas control system, determining the position of a gas burner, debugging a gas temperature control system and setting a roasting curve of aluminum electrolysis cell temperature control equipment; controlling an ignition roasting procedure; starting the gas control system of the electrolysis cell; adopting a batch injection method to inject electrolyte in the electrolysis cell; and electrifying and starting the process. The process has the advantages that a cell chamber is heated uniformly by flame formed by reasonable arrangement of controllable gas; a better roasting effect is achieved by reducing the temperature gradient of a cathode surface along the vertical direction so as to prevent heat shock damage resulted from an overlarge heating gradient and non-uniform lining temperature; and a reasonable coking process for bottom mash is realized by setting a reasonable heating curve, thus effectively getting rid of moisture and volatile substances in a lining, reducing and effectively filling in holes produced in the roasting process of the cathode and the bottom mash, and enhancing the integrality of the cathode, the bottom mash and the lining.

The invention provides a method for recovering cobalt and lithium metals from a waste lithium cobalt oxide battery. The method is characterized by comprising the following steps: (1) carrying out discharge treatment on the waste lithium cobalt oxide battery, and carrying out disassembly, crushing, pyrolysis and screening to obtain black lithium cobalt oxide powder; (2) mixing the black lithium cobalt oxide powder obtained in the step (1) with ammonium salt according to a molar ratio of 1: (1.5-4), putting the mixture into a high-temperature ball mill for enhanced ammonia process roasting to convert the lithium cobalt oxide into sulfate, performing water leaching to obtain a leaching solution rich in Co < 2 + > and Li < + >, recycling ammonia gas generated in the process, and recycling andreusing the ammonia gas in the form of ammonium sulfate; and (3) selectively recovering cobalt and lithium components from the leaching solution rich in Co < 2 + > and Li < + > obtained in the step (2), recovering cobalt by using an organic extracting agent, recovering lithium in residual liquid by using a precipitation method, and recovering the lithium in the form of lithium carbonate. The method meets the requirements of environmental protection, low consumption, high efficiency and short-process recovery of valuable metals from the waste lithium ion battery.

The invention discloses bentonite used for pellets, and a preparation method thereof. The bentonite is composed of the components of, by weight: 90-100 parts of bentonite, 3-5 parts of industrial alkali, and 1-3 parts of cellulose ethers or cellulose sodium. When the pellet-use bentonite provided by the invention is used for coating obtained iron ore pellets, pellet bursting is reduced. The iron ore pellets can be prevented from bursting under more than 3000 Newton and 10 times of drops. Silicon content of the pellets is greatly reduced. As a result of furnace casting experiments, when the pellets are added at a temperature of 1200 DEG C, the pellets do not burst. Also, an iron tapping speed is substantially improved. Compared with a traditional method that only bentonite is used as an additive, the pellet-use bentonite provided by the invention is advantaged in high adhesive force, high pellet degree, reduced roasting time, good roasting performance, improved pellet ore grade, and reduced energy consumption.

The invention provides a method for producing a ceramic die core. The method comprises the following steps of (1) producing a ceramic die core blank; (2) pre-treating a filler for the shaping of the ceramic die core, specifically adding the filler to be treated into a nonmetal material hopper with de-ionized water, continuously stirring slurry obtained by mixing powder and de-ionized water, continuously dropwise adding analytically pure hydrochloric acid to adjust the pH value of the slurry to 4 to 6, stopping adding analytically pure hydrochloric acid when the pH value is changed by less than or equal to 0.2 within 5 minutes, continuing stirring the slurry for 10 to 60 minutes, standing and settling the slurry for 4 to 12 hours, pouring an upper-layer solution, washing settled powder for 1 to 3 times by using de-ionized water until the pH value of an obtained solution is 6 to 8, drying the powder finally sinking to the bottom at 100 to 140 DEG C, calcining the powder for 4 to 6 hours at 1200 to 1500 DEG C, and crushing and sieving the powder; (3) performing shaping calcination; (4) performing reinforcement reconditioning. The method is simple, economical and low in time consumption, manpower is saved, energy consumption is eliminated, the production efficiency of the ceramic die core is greatly improved, and the quality of the ceramic die core is improved.

The invention relates to a method for extracting molybdenum by roasting nickel-molybdenum iron alloy sodium carbonate with high impurities. The process comprising three main steps of preparation, roasting and leaching is as follows: firstly adding sodium carbonate and lime into nickel-molybdenum iron alloy powder with high impurities to evenly mix and mill to roast the sodium carbonate and the lime; and leaching calcine obtained from roasting in a dilute alkali solution into molybdenum and vanadium. The method has the advantages of a small amount of sodium carbonate, high extraction rate of molybdenum and vanadium, low production cost and environment protection and so on.

The invention provides an electric heating roasting preheating electrolytic bath and a cleaning and roasting method. The electric heating roasting preheating electrolytic bath comprises a bath body, a cathode carbon block fixed at the bottom of the bath body, artificial extending legs arranged on the periphery of the cathode carbon block and an anode for lifting in the bath body. The electric heating roasting preheating electrolytic bath is characterized in that electric heating elements are movably arranged below the anode, an intermediate clearance cavity between anodes and a side part cavity between the anode and the bath body and are used for finishing the roasting and the heating of the electrolytic bath. The invention not only has uniform roasting temperature, high energy utilization rate and low electric consumption, but also can realize the automatic control of temperature raising speed, greatly improve the roasting effect, reduce the labor intensity and the roasting cost, simplify the operation and realize the low-carbon roasting. In addition, the invention can reduce the carbon content of electrolyte, avoid a starting bath from generating carbon-containing accidents, enable a roasting bath to be turned into normal production and generate relatively profound effect on improving the roasting method of the electrolytic bath in the further and improving the utilization rate of energy sources and resources, and has broad popularization and application potentials.

Under stable supply, coal gas is fired to burn materiel on lead sinter machine. Through gas pipe, coal gas generated from gas generator is entered to cyclone dust collector. Through gas pipe, dust removed coal gas is entered to branch pipe. Through air pipe, comburant air enters into branch pipe. After branch pipe for coal gas and branch pipe for comburant air are connected to each other, and led to burner, where gas and air are mixed fully in volume ration being about 1:1. Through the burner, mixed gas burns in firebox of ignition furnace. Advantages are: lowering cost by using gas to replace heavy oil, better controlling fire behavior, and good effect for baking materiel.

The invention discloses a high-efficiency roasting shaft kiln for stone coal and aims at overcoming the defects that a flat kiln and a rotary kiln adopted in the prior art for extracting vanadium by roasting the stone coal are low in degree of automation, high in operation cost, high in dust content and serious in pollution, air distribution in a shaft kiln cannot completely meet the requirement of intermediate temperature spontaneous combustion of the stone coal and the like. According to the high-efficiency roasting shaft kiln disclosed by the invention, an air channel communicated with an air inlet is arranged in an inner cavity of a shaft kiln body and is provided with an air feeding port; and the air channel is spirally arranged on the inner cavity wall from bottom to top. The high-efficiency roasting shaft kiln disclosed by the invention is mainly used for roasting the stone coal and is uniform, complete and sufficient in combustion and favorable in roasting effect; the cost of roasting each ton of vanadium in the rotary kiln by using 5 tons of standard coal is saved; 1000 tons of stone coals are roasted each day by 24 persons; the output of the shaft kiln is equivalent to over two times that of the flat kiln; the roasting conversion rate of the shaft kiln is 10-15 percent higher than the flat kiln; during roasting, the dust discharge capacity is only one tenth of the rotary kiln; and in addition, dust and flue gas of the shaft kiln can be centrally treated and remarkable economic and environment-friendly benefits are obtained.

The invention discloses a technology for processing and making edible rice flour. The technology for processing and making edible rice flour, disclosed by the invention, comprises the following eightsteps: selecting materials, airing, shelling, removing dust, roasting, grinding, screening and packaging. The technology disclosed by the invention has the beneficial effects that attention is paid todetails when raw materials are selected, so that high quality of the raw materials can be ensured, and a guarantee is provided for the quality of the made rice flour. Meanwhile, the processing technology is simple and practical, and is suitable for mass factory production and home cooking, the process is simple, the operation is convenient, and rice flour with fragrant taste can be achieved by using simple materials. In the processing technology, hot air blowing is adopting during roasting, so that the stir-fried rice is difficult to be in long-term contact with heating machinery, the heatingis uniform, the roasting effect is excellent, the rice can emit a burnt flavor, and a fragrance guarantee is provided for making the rice flour. Meanwhile, the rice flour is easily ground, the made rice flour is excellent in shape, and the processing efficiency is high.

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 discloses a rotary kiln roasting structure and a roasting process thereof. The rotary kiln roasting structure comprises a bottom plate, wherein a rotary kiln body which is obliquely arranged is arranged above the bottom plate; a first motor is arranged at one side below the rotary kiln body; the output end of the first motor is fixedly connected with a drive gear; the middle part ofthe rotary kiln body is fixedly connected with a driven gear; one end of the rotary kiln body is connected with a coal injection mechanism; the coal injection mechanism comprises a combustor; one endof the rotary kiln body is rotatably connected with the middle part of the combustor; one end, far away from the rotary kiln body, of the combustor is fixedly connected with a connecting tube; the drive gear is engaged with the driven gear, the driven gear rotates, and the rotary kiln body fixedly connected with the driven gear rotates; the rotary kiln body is obliquely arranged, and the rotary kiln body rotates, so that materials move from the head end of the rotary kiln body to one end of the combustor while rotating; the closer the materials are to the combustor, the higher the temperatureis; and the materials are gradually roasted by flame sprayed out from a burner uniformly, so that the roasting effect is better, and roasting energy consumption is reduced.

The invention discloses a charging method for an aluminum electrolysis cell during roasting start, and relates to improvement on an aluminum electrolysis cell charging roasting start method in an aluminum electrolysis production process. A scorched particle roasting method is adopted in the roasting start process. The method is characterized in that calcined scorched particles with high and low resistance rates are charged in the charging process. The charging method for the aluminum electrolysis cell during roasting start is applied to charging operation; and after a conductive medium is selected and laid, in the roasting process, the roasting temperature of a cathode is distributed uniformly, thermal stress of the cathode is reasonably absorbed, and thermal stress concentration is avoided.

The invention relates to a dewaxing mold shell overturning and conveying device. The problems that in a fired mold precision casting process, mold shells are conveyed manually, the labor intensity is high, the work efficiency is low, and automatic and continuous production cannot be implemented are solved. The dewaxing mold shell overturning and conveying device is characterized in that a rotating central shaft (3) is arranged on a support (1); a left jaw (4) and a right jaw (5) which can slide relatively are arranged on the rotating central shaft (3); after the left jaw (4) and the right jaw (5) are combined, a mold shell (6) can be clamped; the rotating central shaft (3) is driven to rotate in a reciprocating manner at an angle of 180 degrees by a driving device (7); and the left jaw (4) and the right jaw (5) are driven by the rotating central shaft (3) to overturn at an angle of 180 degrees. The mold shell is clamped by the left jaw and the right jaw which overturn in a reciprocating manner at an angle of 180 degrees, mold shell dewaxing and mold shell roasting are sequentially carried out automatically, the labor intensity of workers is reduced, the work efficiency is improved, the mold shells are uniformly placed on a roasting conveying belt, and a roasting effect is high.