38results about How to "Increase smelting strength" patented technology

The invention relates to a method for utilizing iron containing metallurgical dust, which comprises that: steel-making sludge, metallurgical dust-removing powder and iron scale are mixed; the mixed raw materials are sent into a rotary kiln and dried, and the drying temperature is determined according to moisture content of the raw materials and controlled to be between 300 and 500 DEG C; the dried materials are cooled by a cooler, the cooled materials are added with 5 to 10 percent of caking agent by weight, and the material and the caking agent are fully stirred evenly by a wheel-rolling mixer; and finally, the mixture is pressed into cooled agglomerated pellet products by a twin-roller machine, the pressure of the twin-roller machine is more than or equal to 500 Kg/cm<2>, and the cooled agglomerated pellet products are prepared into finished products after separation by a vibration sieve. The method has the advantages of low production energy consumption, high product strength, low moisture content and good quality, and can realize full effective utilization of resources; and the finished products of cooled agglomerated pellets can be directly used as a cooling agent and a slag former in steel making, can improve smelting effect and achieve functions of cooling and slag forming, and can be also used for blast furnace process.

The invention relates to a one-step copper smelting technology and a device thereof. The interior of a furnace body is divided into three zones, namely a smelting zone, a blowing zone and a refining zone, by a retaining wall; and two rows of spray guns which are arranged in a staggered manner and have an included angle with a vertical line are arranged at the bottoms of the zones; return dust is mixed and then added into mixed copper concentrate and a solvent through a charging opening of the smelting zone, oxygen-enriched air is sprayed through the spray guns to carry out self-heating smelting, to generate copper matte; the spray guns in the blowing zone spray oxygen-enriched air so as to blow copper matte into crude copper and slag; the spray guns in the refining zone supply oxygen-enriched air for oxidization, and supply natural gas as a reductant for reduction, and the generated anode copper with high purity is interruptedly discharged form a copper discharging opening, so that the low-altitude pollution problem caused by SO2 can be solved, the operation environment can be greatly improved, the utilization rate of sulfur and heat can be obviously increased, and further the economic benefits can be increased further; in addition, the invention provides a one-step copper smelting technology which is more advanced, shorter in flow, lower in investment, lower in comprehensive energy consumption, higher in recovery rate, and better in comprehensive utilization in comparison with the existing continuous copper smelting technology.

The invention provides a magnesium-rich bentonite binder for pellets. The magnesium-rich bentonite binder comprises the following raw material components: 20-30% of magnesite powder, 50-60% of bentonite and 10-20% of borax. The MgO content in the bentonite binder is 28-32%, and the SiO2 content is less than 50%; and the 200-mesh passing rate is more than 90%. The adding amount of the bentonite binder accounts for 2.0-3.0wt% of the total weight of pellet ore raw materials. According to the magnesium-rich bentonite binder disclosed by the invention, the MgO content in the pellet ore can be improved by 1-2%, the grade of sintered ore is improved, the mechanical strength of the pellet ore is simultaneously improved by 1-2%, the smelting in a blast furnace can be strengthened, the problems of material slip and material collapse caused by shutoff pressure due to poor air permeability of a charge of the blast furnace are reduced, the accidents of the blast furnace are reduced, the utilization coefficient of the blast furnace is improved, the initial softening temperature is increased by 100-150 DEG C, the yield of the blast furnace is increased by above 5%, and the ratio of putting coke into the furnace is reduced by 10kg, so that a foundation is laid for oxygen-rich, coal injection and large-ore batch operation of the blast furnace and the smooth production of the blast furnace is ensured.

The invention provides furnace-protecting anhydrous stemming which comprises the following raw material chemical components by weight: 15-25% of corundum powder; 15-20% of coke powder; 15-20% of clay powder; 9-14% of silicon carbide powder; 2-4% of asphalt powder; 15-25% of anthracene oil; and 9-11% of titanium dioxide powder. The stemming of the invention has the characteristics of high strength, low shrinkage, and good caking property, has stable high temperature resistance, can be sintered rapidly, can prolong tapping time and ensure tapping smoothness, provides an iron notch drilling-trhough rate of above 95%, avoids the iron-leaking phenomenon and accidents of iron notch fracture and channel enlargement due to a shallow iron notch, increases the smelting intensity, reduces production cost, and ensures the safe running of blast furnace production. Especially, a titanium sediment wear-resistant protection layer with a small thermal conductivity coefficient and good corrosion resistance is formed, which has the effect of protecting the hearth and the furnace wall near the iron notch, and thus prolongs the service life of the blast furnace hearth and the furnace wall.

The invention discloses a blast furnace ironmaking method. The method includes adding ironmaking raw materials to a blast furnace for smelting; and the ironmaking raw materials contain sinter and pellet, which account for more than 98% of a total weight of the ironmaking raw materials. Melting conditions include: hot-blast temperature in the blast furnace at 1200-1300 DEG C, and oxygen enrichment rate of 4-10% by volume. The blast furnace iron-making method of the present invention can effectively improve the utilization ratio and smelting intensity of the blast furnace.

The invention relates to a method for repairing a damaged cooling wall of a blast furnace and is applicable to the blast furnace ironmaking production in the metallurgical industry. The invention aims at overcoming the disadvantage that the cooling wall is completely replaced after the blast furnace is blown down for a long time in the prior art, and provides a method for boring on a ruptured cooling wall by a self-made electric drill arranged on a rack, drilling through a coiler in the cooling wall, and then connecting the coiler with a hose to pass by a ruptured part to perform a water leakage test and a pressurizing test. The cooling wall repaired by the method can achieve the cooling intensity of a normal cooling wall in operation, thus ensuring the normal production of the blast furnace.

The invention discloses a method for distributing raw materials with high zinc content in a blast furnace with a bell-less top, which comprises the following steps of: (1) controlling ore batch weight to be greater than a critical value, and ensuring that the average thickness of ore at the furnace throat is 8 to 10 percent of the diameter of the furnace throat; (2) adopting a material distribution mode from a small angle to a large angle increasingly at distributor chutes on the furnace top, and ensuring that small particle burden and powder caused by mass flow particle segregation are distributed from the center of the blast furnace to a part 1/3 away from the edge of the furnace wall when a material tank discharges materials; (3) selecting double-ring single pile top large-angle distribution for ore and coke gears, distributing outer-ring ore according to the maximum angle, ensuring that the ore and coke angular difference is -2 degrees and the angular difference of the inner and outer rings of the ore and the coke is 6 degrees, controlling the materials distributed in the inner ring to account for 50 to 60 percent of the total burden, making the ring number of the outer ring distribution at least two, and ensuring that the outer-ring distribution pipe top covers the inner-ring distribution pipe top; (4) adopting a positive packaging and ore-coke unequal line packaging method; and (5) regularly performing tank turning operation on tank-combined blast furnace with the bell-less top, and controlling 4 to 5 tank turning cycle periods in a material column.

The invention discloses a charging material for blast-furnace smelting and a blast-furnace smelting method. The charging material for blast-furnace smelting comprises components in parts by weight asfollows: 60-85 parts of alkaline sintered ore, 10-20 parts of acid pellets and 0-5 parts of geological minerals, wherein alkalinity of the alkaline sintered ore is 2.2-2.3, and alkalinity of the acidpellets is 0.2-0.4; the alkaline sintered ore is prepared from 40-50 parts by weight of vanadium bearing titanomagnetite, 5-10 parts by weight of common fine iron powder, 5-15 parts by weight of boron-bearing iron ore powder, 1-5 parts by weight of SiC powder and 6-10 parts by weight of CaO as raw materials through sintering; the acid pellets are prepared from 50-60 parts by weight of the vanadiumbearing titanomagnetite, 5-10 parts by weight of common fine iron powder, 1-2 parts by weight of magnesite, 3-5 parts by weight of dolomite and 1-2 parts by weight of bentonite as raw materials through sintering. According to the blast-furnace smelting method adopting the charging material for blast-furnace smelting, liquidity of iron slag can be guaranteed, a slag charge structure is changed, slag basicity is reduced, effective availability of the charging material for blast-furnace smelting is improved, blast-furnace smelting efficiency is improved, and smelting cost is reduced.

The invention relates to a smelting assistant for steel works, namely a low-temperature pulverization inhibitor for sintered ore. The low-temperature pulverization inhibitor is prepared by mixing carboxymethyl starch, boric acid, silicon micropowder and a permeate agent in designated proportion; compared with CaCl, Cl ion drag-in quantity is reduced more than 50%, the low-temperature pulverization inhibitor can not generate a replacement reaction with K and Na alkali metals in a furnace charge, therefore, the problem of continuous and circulating enrichment of KCl (kirchhoff's circuit laws) and NaCl in a blast furnace is solved, the reactivity of coke is restrained, the melting loss reaction is reduced, the heat intensity of the coke is ensured, low temperature reduction pulverization rate of the sintered ore is reduced, the destructive effect of the alkali metal on the coke and the blast furnace is basically solved, the furnace condition is smooth, and the output is increased.

The invention belongs to the field of blast furnace smelting, and particularly relates to a method for enhancing oxygen potential of a blast furnace hearth for making iron from vanadium titano-magnetite. The technical scheme is as follows: an iron concentrate is sprayed into a blast furnace through a blast hole. Since the iron concentrate contains FeO, oxygen is introduced into the furnace hearth so as to maintain high oxygen potential in the high temperature region, thereby inhibiting the generation of Ti(CN) and other high-melting-point substances, further being beneficial to improving the blast furnace smelting process and achieving the goal of blast furnace reinforced smelting. The invention enhances the in-furnace vanadium titano-magnetite ratio, increases the utilization coefficient of the blast furnace, and lowers the iron production cost; and the invention is convenient to operate.

The blowing-in method comprises the following steps: filling furnace charge after the furnace is dried, blowing and heating nitrogen at a tuyere for preheating, then feeding hot coal gas and oxygen at the tuyere, controlling the theoretical combustion temperature at 2350-2400 DEG C, and tapping when the theoretical iron amount in a hearth reaches 60% of the normal safe iron capacity; then, the in-furnace load is gradually increased, the in-furnace reduction gas amount and oxygen amount are increased, normal tapping and in-furnace load adjustment are organized, and the theoretical combustion temperature in the stage is 2400-2500 DEG C; according to the invention, heated nitrogen is used for purging materials, quickly and effectively drying and increasing the temperature of the materials, a blast furnace gas system is inerted, heated reducing gas and high-temperature and high-reducibility gas are injected into a tuyere, enter the furnace, immediately undergo a reduction reaction with upper furnace charge, and are combusted with injected oxygen to release a large amount of heat, so that the temperature of a hearth can be quickly increased; blow-in time is shortened, and raw fuel consumption is effectively reduced.

The invention provides a control device and method for converter smelting through CO2 and argon of a rotary kiln. The control device comprises a rotary kiln part and a converter smelting part. An inner cylinder combustion chamber used for performing combustion to generate a heat source and an outer cylinder calcining compartment used for containing to-be-calcined limestone are arranged in the rotary kiln. A heat transmission wall is arranged between an inner cylinder and an outer cylinder. After carbon dioxide generated through calcination is collected through a preheater and a gas collecting pipe, dust removing, drying and pressurizing are carried out on the carbon dioxide, then the carbon dioxide enters pressure buffering tanks, and the clean carbon dioxide is obtained. The converter smelting part comprises a composite carbon dioxide and argon blowing control system mainly composed of the carbon dioxide and argon pressure buffering tanks, pressure detecting devices, flow detecting devices, temperature detecting devices, electromagnetic valves, adjusting valves and the like. During smelting, the respective electromagnetic valves and the respective adjusting valves are used for performing controlling, carbon dioxide blowing is carried out in the earlier stage and the medium stage, argon blowing is carried out in the later stage, and the electromagnetic valves and the adjusting valves can complement one another. According to the control device and method, the steelmaking production cost is reduced, the carbon emission and greenhouse effect can be reduced, and the control device and method conform to circular economy.

The invention discloses a sintering shaft kiln of phosphate pellets, consisting of a kiln body, a hearth, a furnace door and an annular reverberatory furnace. The invention is characterized in that the annular reverberatory furnace which surrounds the kiln body and supplies a heat energy to the upper part of an inner cavity of the shaft kiln from outside to inside is manufactured on the upper part of the kiln body; the annular reverberatory furnace consists of eight combustion furnace cavities which are uniformly built by refractory bricks; a flaming opening of the annular reverberatory furnace is arranged outside the kiln body; a combustion-supporting air pipe which supplies a channel to a combustion-supporting air path and a gas pipe which supplies a gas source to the annular reverberatory furnace for burning are arranged on an outer wall of a cavity body. As the annular reverberatory furnace is manufactured on the upper part of the shaft kiln, a tail gas which is with the temperature of 200 to 300 DGR C and is generated in a sintering production process of the pellets is recovered, and a sintering operation of powdered mineral aggregates is completed by taking the tail gas as the combustion-supporting gas of the reverberatory furnace outside the shaft kiln through the combustion-supporting air pipe, and by making full use of waste heat; thus an energy source is saved, and a pollution is reduced. The sintering shaft kiln of the phosphate pellets provides a processing device for a processing depth and a utilization level of powdered mineral resources, and reduces 20% of a coke ratio of a calcium magnesium phosphate fertilizer.

The invention provides a low-grade scrap copper cleaning and smelting new process and a device thereof. A furnace body of a bottom blowing melting furnace is a cylindrical horizontal rotary smelting furnace, and is lined with refractory bricks; one end of the top of the furnace body is a scrap copper charging port, and a flue port is formed in the other end of the furnace body; a spraying gun portis formed in the bottom of the part, below the flue port, of the furnace body; the side surface of the part, at one end of the flue port, of the furnace body is connected with a copper discharge portdevice, and a slag discharge port device is arranged on the part, at the other end of the flue port, of the furnace body. A furnace body of a bottom blowing oxidation-reduction furnace is a cylindrical horizontal rotary smelting furnace, and is lined with refractory bricks; a flue connecting port and a flue port are formed in two ends of the top of the furnace body correspondingly, and an accessory unloading port and a natural gas burner are distributed at the upper part in sequence; a matte feed port is formed in one side of the natural gas burner; a copper discharge port device and a slag discharge port device are arranged on the other side of the natural gas burner; and a spraying gun port is formed in the bottom of the furnace body. The advantages of reduction of the heat loss, high production capacity and intensity, high efficiency, high smelting strength, high utilization rate of oxygen, good labor conditions, convenience in operation, high production efficiency, good economicalbenefits, energy conservation and environmental protection are achieved.

The invention discloses an immersed oxygen lance continuous converting inclined metallurgical furnace capable of singly performing converting to prepare crude copper and capable of continuously performing converting and refining to prepare anode copper. A flux port is formed in the top end of a furnace body; a hot material port is formed in an end wall, far from one side of a mounting plane, of the furnace body; a cold material port is formed in the upper side, near one side of the mounting plane, of the furnace body; a slag discharge port is formed in the lower side, near one side of the mounting plane, of the furnace body; a copper discharge port is formed in an end wall, near one side of the mounting panel, of the furnace body; a flue port is formed in the top of the furnace body, and multiple oxygen lance insertion holes are formed in the bottom; 1-25 oxygen lances are provided; and gaps of the oxygen lances are 0.5-1.5 m. The immersed oxygen lance continuous converting inclined metallurgical furnace has the following advantages: the metallurgical furnace can prepare both crude copper and anode copper, and is excellent in smelting effect, high in treatment capacity, high in oxygen utilization rate, excellent in environmental protection, excellent in labor conditions, high in automation degree, safe in operation and long service life of the furnace body.

The invention relates to a blast furnace ironmaking method for high-proportion pellets. Mineral aggregates comprising an iron-containing furnace charge, coke and limestone are fed into a blast furnacefrom the top of the furnace, and the iron-containing furnace charge comprises the pellets and sintered ore, wherein the proportion of the pellets is 65 to 75%; and the mineral aggregates comprise 75to 80 parts by mass of iron-containing furnace charge, 20 to 25 parts by mass of coke and 0 to 0.5 part by mass of limestone. By adopting the method provided by the invention, the proportion of the pellets in the iron-containing furnace charge for blast furnace ironmaking can be increased to 65% to 75%, and stable operation of a blast furnace can be guaranteed; and the method has the characteristics of low production energy consumption, low waste gas emission and capability of improving economic benefits of blast furnace ironmaking.

The invention discloses an ultrahigh oxygen-enriched low-carbon smelting method, which is mainly characterized in that the oxygen-enriched rate is increased in the operation process of a blast furnace, the oxygen-enriched rate of the blast furnace is 40-50%, the oxygen-enriched rate of a hot blast stove part reaches 15-20%, and the oxygen enters the furnace at the temperature of 900-1000 DEG C, so that the heat brought by the enriched oxygen is increased, and the carbon consumption in the blast furnace can be effectively reduced; while high oxygen enrichment is achieved, high-reducibility coal gas and coke oven gas are blown at the tuyere, the theoretical combustion temperature of the tuyere can be adjusted, a part of high-reducibility coal gas and coke oven gas can serve as heat sources, a large amount of heat is released through combustion, and the purpose of reducing coke consumption is achieved; the condition that the upper part is cold and the lower part is hot under the high oxygen enrichment condition of a traditional blast furnace is avoided, the main component of coke oven gas is hydrogen, hydrogen replaces carbon to participate in the reduction reaction in the furnace, and the carbon reduction effect is achieved; according to the method, the operation of the blast furnace can be stabilized, the productivity is improved by 20%, and the comprehensive consumption of coke is reduced by 10-15%.