36results about How to "Meet smelting requirements" patented technology

The invention relates to a palletizing method of iron ore powder. A preparation process of an iron ore pellet comprises the following steps of: placing the iron ore powder with different iron contents into a mixing mill according to certain weight percentage (determined according to the iron contents of various powder materials and the requirements for the total iron content of the iron ore pellet), milling in a mixing manner for 1-3 minutes, and then adding organic and inorganic composite binders; then milling in the mixing manner for 5-10 minutes so as to enter a transmission belt to a pellet forming machine; and enabling the formed pellet to enter a low-temperature furnace at a temperature of 100-120 DEG C through the transmission belt for drying for 30-60 minutes and then enter a high-temperature furnace at a temperature of 480-520 DEG C for drying for 30-60 minutes, wherein the intensity of the pellet can reach more than 1800 N so as to meet the requirements for smelting. The palletizing method is easy to realize the flow line large-scale production and has low production cost and wide application value in metallurgy industry.

The invention discloses a pellet with high FeO content. The pellet comprises the following components in percentage by mass: 59-61% of TFe, 21-48% of FeO, 0.27-0.8% of metal Fe, 3.8-4.5% of CaO and 4.3-5.4% of SiO2. The pellet is prepared by the following components in percentage by mass: 91-93% of iron ore concentrate powder, 0-2.0% of inner-coal blending powder, 2-3% of bentonite, and 0-5.5% of outer-rolling coal powder containing 5%-8% of bentonite. The invention further discloses a preparation method of the pellet with high FeO content. The pellet with high FeO content is free from Fe2O3, so that abnormal crystal cracking in the reduction process of transforming Fe2O3 into Fe3O4 is avoided, and the strength is high after the reduction.

The invention discloses a multi-layer composite runner brick and a production method thereof. The multi-layer composite runner brick comprises a brick base body, wherein the brick base body is provided with a steel liquid flow passage; a combining layer and a working layer are sequentially compounded onto the surface of the steel liquid flow passage; the brick base body is prepared from main materials including flint clay, pyrophyllite, third-level alumina clinker and clay, and a small amount of added sillimanite, andalusite and potassium feldspar; the working layer is prepared from main materials including corundum, mullite and alpha-Al2O3 micropowder, and a small amount of added sillimanite, silicon micropowder, clay and andalusite; the raw materials of the working layer are compounded into slurry, the slurry is sprayed onto the surface of the steel liquid flow passage and is fired, and the working layer reacts with a base body layer to form a mullite-based combining layer, thereby forming a whole; in a steel casting process, the working layer, the combining layer and the base body layer are closely combined together, so as to avoid the separation of the working layer. The multi-layer composite runner brick has the advantages that the cost is low, the high-temperature property is good, the anti-scouring erosion capability is strong, the market competition advantage is obvious, the thickness of the working layer can be adjusted through design, and the multi-layer composite runner brick is suitable for smelting different types of special steel.

The invention discloses a machine pressing carbon-free lining brick for steel ladles, which comprises the following components (according to weight percentage): 20-24% of brown aluminium oxide particle, 28-30% of first white alundum particle, 12-16% of second white alundum particle, 15-20% of white alundum powder, 10-12% of alumina micro powder, and 3-6% of efficient binding agent, wherein the diameter of the brown aluminium oxide particle is 3-5 mm, the diameter of the first white alundum particle is 3-5 mm, and the diameter of the second white alundum particle is 0-1 mm. The invention has the benefits that (1) the machine pressing carbon-free lining brick is free from carbon, and in the steel smelting process, carbon in steel is not increased, so that the smelting requirements of low-carbon steel and ultra-low carbon steel are met; (2) an effective binding agent (aluminum sulfate) is adopted as an inorganic binding agent, has higher thermal state strength, and can ensure that the thermal state strength is higher within the range from normal temperature to high temperature, and the low smelting phase is not generated; and (3) compared with a conventional fireproof material, the machine pressing carbon-free lining brick has the characteristics of high density, high compression strength and long service life.

The invention discloses a preparation process of a low-grade laterite nickel ore oxidized pellet. The preparation method comprises the following steps: drying low-grade laterite nickel ore until the moisture content of the laterite nickel ore is 11-13%, and crushing the laterite nickel ore with a double-roll crushing mill until the grain size of the laterite nickel ore is minus 3mm; evenly mixinglaterite nickel ore, iron ore concentrate, chromite and a calcium-containing additive in a mass proportion of (45-50%):(30-35%):15%:(5.0-7.7%); carrying out high-pressure rolling pretreatment on the mixed material; pelletizing on a disk pelletizing machine, wherein the moisture content of fresh pellet is 12-12.5%, and the grain size of the fresh pellet is controlled to 12-16mm; and carrying out drying preheating and roasting on the fresh pellet in a chain gate and a rotary kiln or a belt type roasting machine so as to obtain the finished product oxidized pellet, wherein the preheating temperature is 1000-1100 DEG C, the preheating time is 12-15 minutes, the roasting temperature is 1220-1280 DEG C, and the roasting time is 12-15 minutes. The invention relates to the preparation process of the low-grade laterite nickel ore oxidized pellet with high finished product pellet compression strength and wide roasting temperature range when the laterite nickel ore is used for production of pellets.

The invention discloses a high-quality steel slag iron powder production process. Solid slag is subjected to magnetic separation, rough smashing, magnetic separation and fine smashing, then the solidslag enters a ball mill to be ground, ground products pass through a rotary screen, and particle steel and slag powder are separated out; the particle steel is a final product, the slag powder passesthrough a birotor powder concentrator, tailings and rough middlings are separated out, and the tailings are final products; the rough powder passes through a magnetic separation roller, and tailings and steel slag iron powder are separated out; low-temperature smoke introduced through a high-temperature draught fan and high-temperature smoke are mixed in a smoke furnace, then enter the ball mill and serve as a drying agent for drying the solid slag and a carrier for conveying part of the tailings; gas-solid separation is achieved in a bag dust collector, gas is exhausted to the air through a main smoke exhaust fan, and solid is tailings. According to the high-quality steel slag iron powder production process, except for a smashing procedure, the negative pressure control technology is adopted in the whole process, and the beneficial effects of generating no circulating sewage or dust, being free of weather influence on production, effectively improving the grade of steel slag iron powder, reducing steel smelting production cost and the like are achieved.

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.

The invention provides a method for the dephosphorization of phosphorized crude-nickel iron by refining; a dephosphorization agent of lime or limestone with 3 to 8 percent of the quality of the crude-nickel iron and flux fluorite with 0.5 to 3 percent of quality of the crude-nickel iron are added in the melt high sulfur crude-nickel iron in a middle-frequency induction furnace; under a high temperature, the dephosphorization agent and the flux are melt; the industrial oxygen or high pressure air with a pressure of 0.3 to 0.7MPa is blown into the flux in the furnace; top blowing and refining are carried out for 3 to 15 minutes under the condition of a temperature of 15000 to 1600 DEG C to lead the carbon thereof to be oxidized and carry out slagging after partial iron is led to be oxidizedwith the impurities like silicon and phosphor; after the refining is finished, the slag is removed to obtain the refined nickel iron; wherein, the phosphor, the carbon and the silicon are reduced to be below 0.015 percent; the quality of the nickel is improved to be above 15 percent; the direct yield of nickel is equal to or more than 95 percent. The method of the invention has a simple techniqueand low energy consumption; besides, the method of the invention is easy to realize industrial production.

The invention discloses a preparation method for vanadium-titanium-iron concentrate magnetized pellets for a shaft furnace. The method comprises the steps: a, mixing of raw materials: mixing uniformly a vanadium-titanium-iron concentrate powder and a binder according to the following weight ratio: wherein the weight ratio of the vanadium-titanium-iron concentrate powder to the binder is 100: 2-6; b, pelletizing: pelletizing the uniformly mixed material to obtain green pellets; c, drying: drying the green pellets; d, magnetization roasting: carrying out magnetization roasting of the dried green pellets at the temperature of 1000 DEG C-1200 DEG C to obtain magnetized pellets; and e, protective cooling: carrying out protective cooling of the magnetized pellets or carrying out hot delivery and hot charging into the gas-based shaft furnace for direct reduction. The preparation method has simple process steps, requires a few devices, and can meet needs of industrial production. The pellets obtained by the method can effectively eliminate catastrophic expansion of vanadium-titanium-iron concentrate pellets, play roles of restraining pulverization and bonding and improving desulfurization effect, and meet smelting requirements of the shaft furnace and a blast furnace.