34results about How to "Improve green ball quality" patented technology

A method for preparing oxidated pellets from pure hematite concentrate includes the following steps: after the hematite concentrate is preprocessed until the specific surface area is larger than or equal to 1300cm2.g-1, compound additive which accounts for 0.5 to 1.6 percent by weight of the total amount of hematite concentrate is added, damp milling is then carried out, pelletizing, drying, preheating and roasting are sequentially carried out after damp milling, and thereby the finished oxidated pellet product is obtained. The compound additive is the mixture of humic acid, calcium peroxide and paigeite, the mixture is ground to the grain size of negative 0.074mm after mixing, and the percentage by weight is not lower than 95 percent. The method solves the problems in the preparation of oxidated pellets from the hard-to-pelletize, hard-to-roast hematite concentrate, such as poor pellet quality, high preheating and roasting temperatures, long time, low finished pellet product strength. The method is simple, the quality of the prepared hematite concentrate pellets is high, the preheating and roasting temperatures are low, the time is short, and the method is suitable for the preparation of the oxidated pellets from the hematite concentrate, particularly the preparation of the oxidated pellets from hard-to-pelletize, hard-to-roast spiegeleisen concentrate. The method can realizeindustrialized production.

A high-vanadium and high-chromium type vanadium-titanium magnetite pellet, relating to the technical field of blast-furnace smelting in a high-vanadium and high-chromium type vanadium-titanium magnetite comprehensive utilization method. The high-vanadium and high-chromium type vanadium-titanium magnetite pellet comprises, in percentage by mass, chemical components: V2O5: 0.45-0.62%, TiO2: 2.29-3.20%, Cr2O3: 0.22-0.48%, TFe: 61.88-64.22%, CaO: 0.11-0.63%, SiO2: 3.18-4.77%, MgO: 0.32-0.89%, and Al2O3: 1.62-4.0%, with the balance being inevitable impurities, wherein in TFe, Fe2O3 accounts for 87.51-91.41% of the percentage by mass of the pellet, and FeO accounts for 0.3-0.8% of the percentage by mass of the pellet. In the raw material proportion for preparing the pellet, the proportion of bentonite is decreased by 1% or more, and therefore, the grade of the pellet can be improved; the quality of the fresh pellet can be practically and effectively improved, and the yield and the quality of the pellet can be ensured.

The invention relates to a dust removing method in the production process of metallurgical pellets, in particular to a dust removing system of a chain grate machine tail part. The dust removing system comprises a chain grating machine tail part mechanism with a chain grate machine wheel and a chain grate machine tail wheel return device; the dust removing system is characterized in that a machine tail seal cover is arranged on the chain grate machine tail part mechanism; chain grate machine tail wheel return segment dust removing devices are arranged on the upper part of the machine tail seal cover; an overall chain grate machine tail dust removing device is arranged in the middle part of the machine tail seal cover; and a tail sealing wind box dust removing device of the chain grate machine is arranged at the end part of the lower return of the chain grate machine tail. According to the dust removing system provided by the invention, as the chain grate machine tail wheel return segment dust removing devices are arranged at the three main dust-raising spots of the chain grate machine tail mechanism, and are connected with external exhaust fans by pipelines, thereby forming a negative pressure environment; the three dust removing systems are compensated to one another and are linked with one another, so that the high temperature waste gas can be effectively prevented from overflowing, the tail machine environment of the chain grate machine workshop can be improved, the service life of the heat resistant parts of the equipment can be ensured; and moreover, the temperature gradients of the materials are smoothed, and the mine return quantity of the cured pellets can be reduced.

The invention relates to a high chromium-high vanadium type vanadium titanium ore pellet, in particular to a vanadium titanium ore pellet. The invention mainly solves the problems that pelletizing granularity is coarse and pelletizing performance is poor in the high chromium-high vanadium type vanadium titanium ore pellet prepared by the prior art. The high chromium-high vanadium type vanadium titanium ore pellet is prepared by 45-50 parts by weight of vanadium titanium ore, 50-55 parts by weight of iron material and 1.8-2.1 parts by weight of bentonite, wherein the iron material comprises 11-28wt% of iron powdered ore and 72-89wt% of ultrafine iron powder. The preparation method of the pellet is realized by the following steps of: burdening, drying and mixing, pelletizing, green pellet screening and shaft furnace roasting. Vanadium content of vanadium titanium powder in the vanadium titanium ore pellet provided by the invention reaches up to more than 4.5%, and blast furnace vanadium titanium smelting requirement is met. The high chromium-high vanadium type vanadium titanium ore pellet provided by the invention is applicable to furnace charge for blast furnace vanadium titanium smelting.

A preparation method for high-vanadium high-chromium type vanadium titanium magnetite pellets, comprising: performing wet-grinding on the imported high-vanadium high-chromium type vanadium titanium magnetite; compounding according to the pellet raw material ratio; drying and mixing the raw materials; adding bottom water for material mixing; braising the materials; pelletizing; screening fresh pellets to obtain 8-16 mm fresh pellets; and then drying and preoxidizing, shaft furnace roasting and cooling to prepare the high-vanadium high-chromium type vanadium titanium magnetite pellets.

The invention discloses a pelletizing raw material loosening and blanking device and method. The pelletizing raw material loosening and blanking device comprises a base plate, enclosure plates, a material loosening plate, a vibrating plate and a driving device. The enclosure plates are welded to the four sides of the base plate. The vibrating plate is fixed to the middle of the lower surface of the base plate. Material loosening holes are evenly distributed in the upper portion and the lower portion of the base plate respectively. Material loosening bars penetrate through the material loosening holes. The lower ends of the material loosening bars are welded to the material loosening plate. The driving device is connected to the lower surface of the material loosening plate. The material loosening plate is movably connected to the base plate through shaft pins. The material loosening and blanking device is obliquely arranged between a feeding belt and a disc pelletizer. The material loosening bars vibrate at a certain frequency under the driving of the driving device, and thus pelletizing raw materials fallen onto the base plate are loosened into mineral powder with the uniform granularity; meanwhile, the base plate also vibrates continuously under the action of the vibrating plate, so that the mineral powder dispersed on the base plate is evenly distributed in a pelletizing disc. By the adoption of the pelletizing raw material loosening and blanking device and method, the dispersity of the pelletizing raw materials fallen into the pelletizing disc can be improved, the contact area between a green pellet and the mineral powder is increased, the pelletizing time is sufficient, and the quality of the green pellet is improved; the quality of returned materials is reduced, and the load of a screening system is reduced.

The invention relates to an optimal control of a movable scraper for cleaning the bottom of a pelletizing disk. The technical solution is: obtain the angular velocity ω of the disc pelletizer, establish the mathematical model of the trajectory curve of the movable scraper tool, the mathematical model of the trajectory curve density of the movable scraper and the mathematical model of the coverage index, and bring the obtained coverage index ξ into the simulation program Carry out optimization, determine the optimal parameter ωi of the movable scraper after calculation and optimization, and then input the optimal parameter ωi into the programmable controller PLC[5], the programmable controller PLC[5] is connected with the frequency converter[6], and the frequency conversion Device [6] is connected with frequency conversion motor [7], and frequency conversion motor [7] drives movable scraper [8] through transmission system. The invention makes the movement track of the movable scraper reach the optimal configuration, can greatly improve the coverage of the working area of ​​the movable scraper, can make the disk surface smooth, and the rolling track distribution of the raw balls in the disk is reasonable, and the output of a single machine is improved. And the powder content rate of green balls is reduced, and the ball forming rate of green balls has increased by more than 12%.

The invention relates to a preparation method of high-chromium high-vanadium type vanadium-titanium ore pellets. The invention relates to a preparation method of vanadium-titanium ore pellets. With existing high-chromium high-vanadium type vanadium-titanium ore pellet preparation technologies, pellet superfusion is possible to occur, and pellet caking or nodulation are possible to occur, such that the quality of finished pellet product is influenced. The invention aims at solving the problem. The preparation method of the high-chromium-high vanadium type vanadium-titanium ore pellets comprises the steps of material blending, mixed drying, palletizing, green pellet screening, and shaft furnace roasting. Vanadium content of vanadium-titanium powder in the vanadium-titanium pellets is higher than 4.5%, such that a requirement by blast furnace vanadium-titanium smelting is satisfied. The high-chromium-high vanadium type vanadium-titanium ore pellet preparation method provided by the invention is used for preparing vanadium-titanium ore pellets.

The invention discloses an iron ore pellet balling device. The device comprises an ore powder bin containing ore powder, an ore powder belt arranged below the ore powder bin, a first balling disc connected with the ore powder belt and a second balling disc arranged below the first balling disc. Ore powder falls onto the ore powder belt from the interior of the ore powder bin. Ore powder is conveyed into the first balling disc under the action of the ore powder belt, and green balls with the first weight are generated under the action of the first balling disc. Ore powder, not generating greenballs, in the first balling disc and the green balls with the first weight enter the second balling disc, and green balls with the second weight are generated under the action of the second balling disc. The technical effects that the ore return rate in the pellet balling process is greatly reduced, the yield is increased, the surface quality and strength of the green balls are improved, and energy consumption is reduced are achieved.

The invention belongs to the technical field of iron ore pellets, and mainly relates to a compound additive for iron ore pellets and iron ore pellets. In terms of mass percentage, the compound additive for iron ore pellets of the present invention ranges from 30% to 30%. 50% of the tackifier, 10% to 20% of the strengthening agent, 5% to 10% of polyethylene glycol, and the rest are water, which are prepared according to the proportions of the various components, and then uniformly mixed. This additive is mixed into iron ore powder in a certain proportion, fully mixed, and pelletized in a disc pelletizer, and then the green pellet strength is tested. This additive can effectively improve the falling strength and compressive strength of green balls and improve the quality of green balls.

A pelletizing disc control system and method belong to the technical field of automation of the metallurgical industry. The pelletizing disc control system comprises a pelletizing disc controller, a feed silo meter, a feeding belt batching scale, a water supply flowmeter, a control valve, a pelletizing disc speed sensor and a scraper speed sensor, wherein the sensors acquire data of feed silo material level L, pelletizing disc feed quantity W, supply pipe water addition F, control valve opening degree V, pelletizing disc rotational speed S and scraper rotational speed S1 and send the acquired data to an upper computer and the pelletizing disc controller; the upper computer performs linkage on L and feeding belt speed; the pelletizing disc controller performs linkage on F and W; and an operator can adjust S, S1 and F according to the pelletizing quality and displayed values. As operation of pelletizing discs are centralized on site, the pelletizing quality can be improved more visually and efficiently, and the production efficiency is improved; one person can operate multiple pelletizing discs to pelletize; and frequency signals susceptible to electromagnetic interference are converted into standard current signals which are then transmitted to the upper computer, so that the signal truth and accuracy are guaranteed.

The invention discloses a preparation method of a difficult-to-make ball carbon-containing iron-containing dust pellet material and its application in the iron ore powder composite agglomeration process; Humic acid-modified bentonite is subjected to moist grinding or strong mixing, and then pelletized to obtain carbon-containing and iron-containing dust pellets; this method can make carbon-containing and iron-containing dust that is difficult to pellet into balls with high falling and compressive strength Agglomerates meet the requirements of the iron ore powder composite agglomeration process for the strength of dust green pellets; when the agglomerates are used in the iron ore powder composite agglomeration process, the ratio of iron-containing dust pellets can be significantly increased, and the composite The quality index of agglomerate products realizes efficient, reasonable and large-scale utilization of carbon-containing and iron-containing dust, achieves the purpose of saving secondary resources and protecting the environment, and meets the requirements of industrial production.