123results about How to "Reduce ironmaking costs" patented technology

The invention provides an efficient separation method for low-grade and complex iron ores. The method is characterized in that the complex iron ores of different grades and species are classified, so as to obtain lump ores and mineral powder which are balled, dried and preheated; reduction roasting, cooling, ball milling, magnetic separation, ball milling and magnetic separation or reverse flotation are performed in turn, so as to obtain iron ore concentrate or reduced iron powder; classification treatment is to crush and screen the iron ores with iron-containing grade between 50 and 56 percent and then dry and preheat obtained ores; fine-grained mineral powder is ground, washed, ground, deslimed and separated so as to obtain the iron ore concentrate and slime containing 58 to 60 percent of iron; the slime which is washed, deslimed, and separated is dewatered and dried and is added to and well mixed additives, so as to be balled then; the iron ores with the iron-containing grade between 40 and 50 percent are crushed and screened so as to obtain the lump ores which are directly dried and preheated, while the fine-grained mineral powder is obtained through dry-type grinding and then is added to and well mixed the additives so as to be balled then; and the iron ores with the iron-containing grade between 25 and 40 percent are crushed and screened so as to obtain the lump ores which are dried and preheated, while the fine-grained mineral powder is subjected to grinding, gravity separation or high-gradient magnetic separation and reverse flotation, so as to obtain coarse iron concentrate powder which is added to and well mixed with the additives and then is balled.

The invention discloses an optimized ore blending method based on sintering-pelletizing-ironmaking linkage, and belongs to the technical field of optimized ore blending before ironmaking. The method comprises the steps: 1, building a model, building a molten iron cost calculation model, wherein the calculation model comprises a sintering mixture calculation module, a pelletizing mixture calculation module and a shaft furnace mixture calculation module; 2, setting a constraint condition, and setting constraint conditions of all raw materials according to the performance difference of sinteringpowder, pelletizing fine powder and lump ore; 3, calculating the cost of iron per ton: calculating the cost of the iron per ton through combining with the price and performance conditions of the resources in the iron ore market, carrying out the continuous iteration calculation through a planning solving equation, and solving the raw material ratio when the cost is minimum. Through combining withthe conditions of resources in the iron ore market and the effective chemical components, the method takes the cost of molten iron as an optimization target, performs the continuous iteration calculation through the planning solving equation, solves the optimal raw material ratio, and achieves the purpose of optimizing the ore blending.

The invention belongs to the technical field of iron and steel metallurgy, in particular relates to a blast furnace smelting method by using a vanadium-titanium two-phase sintering ore. The blast furnace smelting method by using vanadium-titanium two-phase sintering ore is characterized in that the blast furnace burden structure is as follows: 70-100wt% of vanadium-titanium two-phase sintering ore, 0-30wt% of vanadium titanium magnetite pellet and 0-10wt% of common iron ore, wherein the common iron ore is an iron ore containing no vanadium or titanium. The invention provides the blast furnace smelting method by using vanadium-titanium two-phase sintering ore, and the method is low in cost; vanadium-titanium titanic magnetite for blast furnace smelting is provided by the vanadium-titanium two-phase sintering ore, so as to optimize the blast furnace burden structure, improve the breathability of the blast furnace burden structure and perfect the technical-economic indicator of blast furnace smelting.

The invention relates to a process for blasting oxygen-enriched hot blast to a blast furnace and a device applied to the same. The process comprises the following steps: producing oxygen-enriched air, preheating the oxygen-enriched air or air mixture of the oxygen-enriched air and the air to obtain oxygen-enriched hot blast and blasting the oxygen-enriched hot blast to the blast furnace. The device comprises an enriched oxygen producing device, a blower and a hot blast furnace, wherein the inlet of the blower is communicated with the outlet of the enriched oxygen producing device and the air respectively via pipelines; the outlet of the blower is communicated with the air inlet of the hot blast furnace; and the air outlet of the hot blast furnace is communicated with the tuyere of the blast furnace. By blasting the oxygen-enriched hot blast with higher concentration to the blast furnace and improving the coal injection ratio, utilization factor and yield of the blast furnace by preheating, the invention has the advantages of reducing the coke ratio, improving the ironmaking efficiency, lowering the ironmaking cost and reducing CO2 exhaust. The invention can also compute the energyconservation effect of oxygen-enriched blast more precisely and provide a good medium for energy performance contracting.

The invention relates to a method for preparing all vanadium titanium iron ore concentrate pellet ore. The preparation method comprises the following steps that: the all vanadium titanium iron ore concentrate is added with 1.5 to 2.5 percent bentonite, evenly mixed, grinded, pelletized, dried, oxidized and roasted, thereby preparing the all vanadium titanium iron ore concentrate pellet ore; when a pellet is preheated, the temperature is between 800 and 1000 DEG C, and the time is between 10 and 15 minutes; when the pellet is roasted, the temperature is between 1200 and 1250 DEG C, and the roasting time is between 15 and 25 minutes. The all vanadium titanium iron ore concentrate pellet ore prepared by the invention comprises 10 to 14 percent of TiO2 and 0.4 to 0.7 percent of V2O5 and has the pressive strength reaching 2400 to 3800 N/each, can meet the smelting need of a large-scale blastfurnace; and the all vanadium titanium iron ore concentrate has low roasting temperature and is easy to realize industrialized production.

The invention provides a method for the leakage detecting and handling of a blast furnace soft water closed circulating cooling system. Through the liquid level difference variation of an expansion tank of a soft water system, the coal gas pressure direction in the expansion tank or a degassing tank can be detected, the phenomenon of bubbles or white turbidity is generated in water flow in a flap flowmeter on a cooling wall of the closed circulating cooling system; during the process that the pH value is continuously and slowly reduced, seepages of water stain and mirabilite can be judged to be generated on an eye plate of a blast furnace shell, so that the judgment shows that the cooling wall or an inner wall of a pipeline is damaged; the flap flowmeter is then utilized, the damage point location of a cooling wall water pipe is determined, and longitudinal treatment is carried out; and a pressure gauge installation pressing leakage detection method is utilized to determine the damage point location of the cooling water pipe, and the lateral treatment is carried out. By the method, the working efficiency is increased, the labor intensity is reduced, leakage points can be found out and treated in real time, and solid foundation is laid for the safety, success production and stable production of a blast furnace.

The invention relates to a pellet ore binder prepared by taking sludge generated in sewage treatment as a raw material. The binder comprises sludge in a preliminary sedimentation tank, sludge in a coagulation sedimentation basin or residual activated sludge, wherein the sludge in the preliminary sedimentation tank, sludge in the coagulation sedimentation basin or residual activated sludge are powdery sludge obtained by drying, crushing and treating. The invention also relates to an application and a usage method of the pellet ore binder prepared by sludge. The pellet ore binder prepared by sludge generated in sewage treatment is capable of raising the grade and the metallurgy performance of a furnace ore, reducing the iron-making cost, reducing the resource consumption and energy consumption, minimizing the pollutant discharge capacity and raising the capability of national steel material and product in the competition of international markets. The sludge generated in sewage treatment which is difficult to be treated can be obtained resource utilization with high efficiency, so that the mineral product resource such as bentonite and the like can be saved.

The invention discloses a method for re-concentrating vanadium-titanium magnetite concentrate through alkaline leaching, acid pickling and magnetic separation. The method comprises the following steps: placing the vanadium-titanium magnetite concentrate in an alkali solution of which the mass concentration is 5-52% to be subjected to alkaline leaching reaction at the temperature of 280-370 DEG C for 0.5-5 hours, and filtering to obtain a filtrate and an alkaline leached filter cake A; preparing the filter cake A into ore pulp by adding water according to the fact that the mass ratio of solid to liquid is 1:(1-10), placing the ore pulp into an H2SO4 solution of which the mass concentration is 1-10% to be subjected to acid pickling at the temperature of 50-90 DEG C for 5-60 minutes, and filtering to obtain a filtrate and an acid picked filter cake B; preparing the filter cake B into ore pulp of which the mass concentration is 30-35% by adding water to be subjected to magnetic separation, so as to obtain iron ore concentrate of which the TFe content is 64-68% and titanium concentrate of which the TiO2 content is 40-60%. The method has the advantages that the vanadium-titanium magnetite concentrate can be efficiently sorted, the alkali consumption is low, the content of impurities such as Al and Si entering a blast furnace, especially the content of detrimental impurities such as TiO2 and S, is reduced, the utilization coefficient of the blast furnace is increased, the iron-making cost is reduced, the problem of high S content in the smelting process is solved, and the comprehensive utilization ratio of a titanium resource is increased at the same time.

The invention belongs to the field of test of lump coal properties and particularly relates to a lump coal property test method for a melting gasification furnace. A lump coal pyrolysis experimental method for the melting gasification furnace comprises three steps, namely lump coal mechanical strength experiment, lump coal coking characteristic experiment and lump coal semicoking strength experiment; a coal sample with the particle size of over 6 millimeters is used as a sample and prepared into 5 to 20 kilograms of samples; and a large-sized coking experiment coke furnace is used. In the lump coal pyrolysis experimental method for the melting gasification furnace, the experiment coke furnace, the sample and the process can better simulate states of lump coals in the melting gasification furnace, so that the problem of low discrimination of the conventional heat stability experiment can be solved; furthermore, the lump coal species for the melting gasification furnace, which are suitable for a COREX process can be selected accurately and effectively, the selection range of the lump coals for the COREX is expanded, and the iron-making cost of the COREX process is reduced.

The invention discloses an iron ore well-blended powder with Sierra Leone coarse powder for reducing cost and improving efficiency. The iron ore well-blended powder includes, by weight, 8-25% of the Sierra Leone coarse powder, 15-40% of Brazilian Carajas sinter feed, 15-30% of Brazilian coarse iron ore powder, 15-25% of Australian FB powder, and 8-25% of Mauritania coarse powder. In the invention,the Sierra Leone coarse powder is successfully applied to sinter the well-blended ore; by matching proper iron ore, adverse factors, such as high content of Al2O3, high assimilation temperature and low liquid phase strength, of the Sierra Leone coarse powder, are overcome, thus guaranteeing the application effect of the Sierra Leone coarse powder.

The invention discloses a method for recleaning vanadium titanium magnetite concentrate by using alkaline leaching and desliming. The method comprises the following steps: placing vanadium titanium magnetite concentrate into an alkaline solution with the mass concentration of 5-52%, performing alkaline leaching reaction for 0.5-5 hours at the temperature of 260-370 DEG C, and filtering to obtain a filtrate and an alkaline-leached filter cake A; adding water to the A to prepare A to ore slurry with the mass concentration of 21-15 % for performing desliming operation so as to obtain a sand setting B and an overflow C, wherein the sand setting B is a final iron concentrate with the TFe content of 60-68%, and the overflow C is a final titanium concentrate with the TiO2 content of 40-50%. The method has the advantages that the efficient separating of the vanadium titanium magnetite concentrate is realized; the alkali consumption is low; the contents of impurities such as Al and entering a blast furnace can be reduced, in particular the contents of harmful impurities such as TiO2 and S; the blast furnace utilization coefficient is increased; the blast furnace slag discharge capacity is reduced; the ironmaking cost is reduced; the problems of high S content and serious pollution in the smelting process can be solved; meanwhile, the comprehensive utilization of a titanium resource is improved.

The invention discloses a powder containing lump ore conveying system, comprising a belt conveying system and a separating device. The invention is characterized in that powder containing lump ore is conveyed to a vibrating screen to be separated when moisture content is less than 4%, oversize product after screening is conveyed to a blast furnace, and screenings is subject to sintering; and powder containing lump ore is conveyed to a soaking and washing device to be separated when moisture content is more than 4. Net powder content of lump ore after being separated by the soaking and washingdevice can be reduced to about 3.5%, and screening efficiency meets the requirement of charging of blast furnace. Thus, even if in rainy season or moisture content of lump ore is high, lump ore whichcan be still used is charged, charging ratio of lump ore is improved, and blast furnace ironmaking cost is reduced.

The invention provides a high-grade vanadium-titanium pellet. The high-grade vanadium-titanium pellet is prepared from a high-grade vanadium-titanium-iron concentrate, steel slag powder, fly ash and bentonite. The invention further provides a preparation method of the high-grade vanadium-titanium pellet. According to the high-grade vanadium-titanium pellet, iron and carbon in iron-making fly ash and iron, CaO and V2O5 in steelmaking steel slag are utilized, reasonable utilization of secondary resources is achieved, a positive effect is achieved on reduction of an iron-making production cost, and actual production results show that the vanadium-titanium pellet contains 57%-60% of TFe, 8%-12% of TiO2 and 0.6%-0.9% of V2O5, and a roasted pellet compressive strength reaches 2,000-2,500 N/pellet.

The invention relates to a treatment method for dehydrating and upgrading high-moisture and high-volatile low-rank coal, and discloses a method for preparing blast furnace blowing semicoke by upgrading low-rank coal based on a high-pressure hydrothermal reaction, wherein the method comprises four steps of low-rank coal pretreatment, high-pressure hydrothermal upgrading, waste heat recycling and upgraded semicoke dehydration and drying. According to the method, low-heat-value low-rank coal is converted into high-quality blast furnace blowing upgrading semicoke by utilizing a high-pressure hydrothermal reaction upgrading technology, wherein the moisture content of the semicoke air drying base is less than 6%, the volatile component content is less than 25%, the Hardgrove grind ability indexis greater than 60, the high-order heat generation value is greater than 24000 kJ/kg, soluble potassium salt, sodium salt and sulfate components in ash are dissolved out, the organic sulfur in coal iseffectively separated out, and the upgraded semicoke can meet the performance index requirements of coal for blast furnace blowing; and the method provided by the invention effectively solves the problems of high water content, high volatile component content, low heat value and high harmful element content of blast furnace blowing of low-rank coal, and provides a clean, efficient, low-energy-consumption and high-added-value low-rank coal upgrading utilization method.