48 results about "Silicon iron" patented technology

The invention discloses a step-by-step enrichment flotation method for niobium ore, and belongs to the technical field of mineral processing. The method comprises the steps that niobium ore is subjected to crushing, ore grinding and size mixing, then weak magnetic treatment is carried out to remove strong magnetic minerals, after pH adjustment is carried out on magnetic separation tailings, a siliceous mineral inhibitor, a foaming agent and a hydroximic acid metal organic complex collecting agent are added for iron-niobium bulk flotation, and obtained iron-niobium pre-enriched concentrate is subjected to reagent removal treatment; and then an amine collecting agent and an iron mineral inhibitor are adopted for iron-niobium separation flotation, and niobium concentrate is obtained. According to the method, the collecting characteristic advantages of a hydroximic acid metal organic complex collecting agent and an amine collecting agent on siliceous minerals, iron minerals and niobium minerals are combined, efficient separation of silicon, iron and niobium is achieved by conducting flotation desiliconization firstly and then conducting flotation deferrization, the conventional desiliconization and deferrization technological process is simplified, the loss rate of the niobium minerals is reduced, and the yield of the niobium minerals is increased. The resource utilization of the niobium ore is effectively realized.

The invention discloses a method for recovering iron in tailings of copper separation from copper smelting slag through combination of microwave-assisted oxidizing roasting and magnetic separation, and belongs to the technical field of metallurgical solid waste resource utilization. The method comprises the steps that high-temperature copper smelting slag is subjected to water quenching, crushing and ore grinding, flotation and copper removal to obtain tailings containing silicon iron, after a calcium-based additive is added for ball milling and mixing, microwave oxidizing roasting is conducted under the oxygen-enriched condition, roasting products are subjected to high-gradient magnetic separation after crushing and ore grinding, and iron ore concentrate and magnetic separation tailings are obtained. According to the method, the strong wave-absorbing characteristic of fayalite is utilized, the roasting temperature and energy consumption are reduced through microwave heating, iron-silicon separation is achieved through a calcium-based additive, and iron is recycled through magnetic separation in one step. The final magnetic separation iron recovery rate reaches 85% or above, the iron ore concentrate grade exceeds 60%, magnetic separation tailings can be used as building materials, the process is simple, the cost is low, environment friendliness is achieved, the defects of a traditional process are overcome, and high-value utilization of solid waste is achieved.

The invention relates to a method for curing harmful components in hazardous wastes, which comprises the following steps: uniformly mixing high-silicon iron tailings and blast furnace fly ash, adding the mixed material into chromium-containing waste liquid, stirring, carrying out plate-frame pressure filtration, carrying out pressure filtration again to obtain a mixed material, cutting the mixed material into blocks, drying the cut mixed material, and roasting after treatment to obtain a roasted product; carrying out rapid water cooling on the roasted product, and grinding after water cooling; and performing magnetic separation on the grinding product to obtain iron ore concentrate containing ferrochrome spinel and low-chromium tailings. According to the method, solid waste high-silicon iron tailings and blast furnace fly ash generated by iron and steel enterprises are used as curing agents, curing of heavy metal chromium in the chromium-containing sludge is achieved, the leaching rate of hexavalent chromium and total chromium in the obtained product is far lower than the standard limit value, harmless treatment of the chromium-containing sludge can be achieved, and the method is suitable for industrial production. The obtained ferrochrome spinel can be recovered through magnetic separation, and the generated low-chromium tailings can be directly subjected to landfill treatment or used as building materials.

The invention discloses a high-aluminum limonite and specularite ore blending and sintering method which comprises the following steps: 1) preparing primary pre-blending powder: pre-blending high-aluminum limonite, specularite concentrate powder, iron oxide scale, limestone powder and anthracite powder to prepare the primary pre-blending powder with the water content of 6.5-7%; (2) preparing a uniformly mixed material: blending the primary pre-blended material powder obtained in the step (1) with high-silicon iron ore powder and hematite and limonite powder to prepare the uniformly mixed material; 3) sintering and burdening: burdening the uniformly mixed material obtained in the step 2) with limestone, dolomite powder, quicklime, solid fuel and return mine, and 4) controlling the components of the sintered ore as follows: 2.3-2.5% of Al2O3, 5.7-6.5% of SiO2, 8-8.5% of FeO and 1.85-2.5% of MgO. According to the invention, while 20-30% of the proportion of the discount ore silk road powder in the total uniformly mixed material is increased, the sintering cost is reduced by 20-42 yuan / ton, the drum strength of the sintered ore is greater than or equal to 78.5%, the return mine rate is less than or equal to 27%, and the RDI + 3.15 mm is greater than or equal to 63%.

The invention provides a high-added-value recycling method of silicon and iron elements in iron tailings, and relates to the technical field of high-value and resource utilization of metallurgical solid wastes. The method comprises the steps of iron tailing grinding, middle-stage magnetic separation, microwave roasting, water quenching, grinding, high-stage magnetic separation, first-stage hot-pressing acid leaching, vacuum roasting, water quenching, second-stage hot-pressing acid leaching, low-stage magnetic separation of weakly magnetic minerals, ultrasonic acid leaching for iron extraction, aging reaction, filtering, drying and roasting. And finally obtaining high-purity quartz powder of more than 4N grade and nano iron oxide of which the purity of Fe2O3 is more than 95%. According to the method, silicon and iron elements in the iron tailings are recycled in a layered and stepped manner, and the acid leaching filtrate generated in the preparation process of the high-purity quartz powder is subjected to closed treatment, so that valuable components of silicon and iron in the iron tailings are utilized at a high value to the maximum extent, and no secondary waste liquid is discharged; meanwhile, the problem of fluorine pollution in the traditional process is avoided in the process of preparing the high-purity quartz powder, and the method is low-carbon and green and has remarkable economic benefits.

The present invention provides a rare earth ferrosilicon alloy prepared based on NdFeB oil sludge and waste silicon powder from cutting and a preparation method thereof, the preparation method comprising the following steps: (1) pre-treating the NdFeB oil sludge to obtain a solid powder; (2) fully mixing dried waste silicon powder from cutting, metal calcium particles, anhydrous chloride and the solid powder obtained in step (1) in a certain proportion, and heating for a certain period of time under protective atmosphere conditions to obtain a rare earth ferrosilicon alloy and a slag phase. The method provided by the present invention is simple to operate, has a short reaction time, and has a high purity of the recycled alloy, thereby realizing the synergistic high-value utilization of NdFeB oil sludge and waste silicon powder from cutting.

The invention discloses a production method for optimizing smelting of low-silicon molten iron, and belongs to the technical field of steel smelting. The method comprises the following steps: 1) optimizing a raw material ratio: selecting high-quality iron ore, coke and a flux as main raw materials; the flux is a mixture of limestone and dolomite in a mass ratio of (0.9-1.1): (0.9-1.1); 2) smelting process parameter optimization: controlling the air volume, air pressure and air temperature of the blast furnace in the blast furnace smelting process; meanwhile, the coke load is reasonably adjusted and is kept between 2.5 and 3.0; when the low-silicon molten iron is smelted, converter slag charge is added in three batches; (3) improving an in-furnace operation technology; (4) molten iron pretreatment; and 5) quality detection and feedback control. The invention aims to realize stable production of the low-silicon molten iron, reduce the production cost and improve the smelting efficiency and the molten iron quality.

The invention belongs to the technical field of metallurgical ironmaking, and discloses a high-silicon iron ore pellet as well as a preparation method and application thereof. The preparation method of the high-silicon iron ore pellets comprises the following steps that S1, high-silicon iron ore, a binder and ferrous nitrate are mixed, hydrogen peroxide is added for pelletizing, and green pellets are obtained; and S2, the green pellets are dried, preheated and roasted, and the high-silicon iron ore pellets are obtained. The preparation method of the high-silicon iron ore pellets is high in process compatibility, the consolidation kinetics of the high-silicon iron ore under the low-temperature condition can be effectively enhanced according to the characteristics of the high-silicon iron ore, and the mechanical strength and metallurgical performance of the pellets are remarkably improved on the premise of not depending on high-temperature or long-time roasting; environment protection and efficient utilization of resources are considered, green low-carbon production of high-quality pellets is achieved, and the method is simple in process, controllable in cost and high in adaptability, has large-scale industrial popularization potential and is expected to promote transformation of the iron and steel industry to the green low-carbon direction.

The invention relates to metallurgical methods for decontaminating and utilizing aluminium production waste sludges, and more particularly to obtaining aluminium and alloys thereof from oxidized forms in combination with alumina or alumina-containing products. The technical result of the invention is an increase in the efficiency of aluminium reduction. A method for decontaminating and utilizing aluminium production waste sludges entails the thermal reduction of oxidic forms of aluminium, silicon iron and copper, which are reduced from a molten charge during treatment with carbon monoxide. A prepared charge of metal oxides is treated in a gas lift furnace, with molten charge being continuously circulated through separated melting, gas lift and settling chambers at a temperature of 1000-1100ºС.

The invention belongs to the field of steel smelting, and particularly relates to a heat treatment method of hot work die steel, which comprises the following steps: 1, preheating steel to a quenching temperature higher than AC3 + 30 DEG C; secondly, the bulk materials are cooled and placed in static air, a cooling medium is graphite or quartz sand or carborundum or silicon iron, the temperature ranges from-70 DEG C to 470 DEG C, the bulk materials are in a vibration fluidization state or a static state, and the critical temperature point of the steel materials and the stability of austenite are considered in the large-range temperature; 3, when the hot die steel is cooled to the temperature of the cooling medium; fourthly, the workpiece in the third step is subjected to follow-up tempering treatment; and vibration fluidization cooling is controlled in a bulk cooling medium, so that the specified structure morphology is obtained, and the metal performance is improved.

The invention relates to the technical field of pellet production, in particular to a method for producing high-silicon and high-reducibility alkaline pellets from tailings obtained after steel slag magnetic separation, and the method specifically comprises the following steps: S1, flux preparation: carrying out hot disintegration on converter steel slag of high-silicon iron concentrate, cooling, crushing until the particle size is less than or equal to 8mm, and finally carrying out magnetic separation treatment to obtain tailings; in the tailing metallic iron, the content of MFe is smaller than or equal to 1 wt%, the weight percentage of TFe is smaller than or equal to 1 wt%, the weight percentage of CaO is larger than or equal to 45 wt%, the weight percentage of SiO2 is smaller than or equal to 15 wt%, and the weight percentage of Al2O3 is 2-4 wt%; s2, preparation of high-silicon alkaline green pellets: taking the steel slag tailings as a pelletizing core, taking fine iron powder as adhesive powder, and spraying atomized water for pelletizing; the method has the beneficial effects that iron and calcium resources in the converter slag are fully recycled, the resource utilization rate is high, and the energy cost is saved.

The invention provides nitrogen-containing steel die casting covering slag and a preparation process thereof, and belongs to the technical field of covering slag. The invention relates to nitrogen-containing steel die casting covering slag which is prepared from the following components in parts by weight: 3 to 7 parts of iron oxide powder, 15 to 30 parts of wollastonite, 10 to 40 parts of flint clay, 8 to 18 parts of aluminum ash, 5 to 10 parts of silicon iron powder, 5 to 10 parts of quartz, 5 to 10 parts of lithium carbonate, 5 to 10 parts of sodium fluoride and 5 to 10 parts of laterite. The weight part of the silicon iron powder is 2-7 parts, the weight part of the quartz is 20-30 parts, the weight part of the lithium carbonate is 1-3 parts, the weight part of the sodium fluoride is 1-5 parts, and the weight part of the laterite is 10-25 parts. According to the nitrogen-containing steel die casting covering slag, through resource utilization of aluminum ash, the problem of nitrogen precipitation in the condensation process of a nitrogen-containing steel die casting ingot is solved, and the occurrence rate of subcutaneous pores and cracks of the nitrogen-containing steel die casting ingot is remarkably reduced.

The invention belongs to the technical field of blast furnace smelting furnace charge preparation, and particularly relates to a method for generating metallized agglomerates through high-temperature reduction of biomass prepared in high-silicon iron ore, which comprises the following steps: S1) drying biomass, bituminous coal and high-silicon iron ore, then screening, and adding into a ball mill for uniform mixing; s2) pressing the uniformly mixed material by using a briquetting machine to form a cylindrical block mass; and S3) carrying out roasting reduction treatment on the block mass. The method has the advantages that the biomass is used as a part of reducing agent to replace traditional pulverized coal, so that the use of fossil fuel is reduced, the energy consumption is reduced, and the reduction of carbon emission is facilitated. According to the method, the reduction efficiency of the high-silicon iron ore is improved by accurately controlling the carbon-oxygen ratio and the biomass ratio. And reducing gas is rapidly generated in the pyrolysis process of the biomass, biomass charcoal is deposited on the surfaces of high-silicon iron ore particles and in pores, a coupling effect is formed, and low-temperature rapid reduction of iron oxide is promoted.

This invention belongs to the field of asbestos tailings utilization technology, specifically disclosing a process for the enhanced reduction of serpentine tailings to prepare metallic magnesium. The method includes: crushing and grinding serpentine tailings to obtain mineral powder; pre-treating and activating the powder with heat; adding a dehydroxylation agent; and pressing the powder into pellets; placing the pellets in a reactor and heating them to 600-750℃ for dehydroxylation treatment to generate hydrogen gas; evacuating the reactor and heating it to 1080-1200℃ for a reduction reaction, with the generated magnesium vapor collected by a condenser; and subjecting the remaining residue to magnetic separation and acid washing to obtain iron oxides and silicon-rich amorphous powder. This invention achieves the cascade utilization and self-reduction of magnesium-silicon-iron from serpentine tailings. Through a closed-loop design of "using waste to produce hydrogen and using hydrogen to extract magnesium," the tailings are converted into high-purity metallic magnesium and multiple high-value by-products, resulting in significant environmental and economic benefits.

The invention discloses a manganese-silicon alloy powder recycling process and system, and aims to realize efficient recycling and reutilization of manganese-silicon alloy powder. The process comprises the steps that manganese-silicon alloy powder and silicon-iron powder are mixed according to a preset proportion and added into a direct-current electric arc furnace to be smelted, the mixture is melted through electric arc heat and resistance heat, and the effects of desulfurization and uniform components are achieved; voltage and current parameters are controlled, the height of the charge level in the furnace is kept unchanged by continuously adding the mixture, and stable smelting is ensured; and after smelting is completed, deslagging and discharging of the liquid ferromanganese alloy are conducted, then cooling, crushing and screening are conducted, and a qualified ferromanganese alloy finished product is obtained. The system comprises a mixing device, a direct-current electric arc furnace, a tapping device, a cooling system and a crushing and screening device, and automatic control and efficient product recovery in the smelting process are achieved. The method has the beneficial effects that the resource utilization rate is increased, the smelting process is optimized, and the method has the characteristics of high efficiency, environmental protection and low cost.

The invention discloses an impact-wear-resistant flux-cored wire for welding a high-manganese steel lining plate and a surfacing method, belongs to the technical field of surface engineering, and aims to solve the problems that a traditional high-manganese steel lining plate is embrittled, a surfacing layer is peeled off and deformed and the like. A flux core of the flux-cored wire comprises high-carbon ferrochrome powder, micro-carbon ferrochrome powder, graphite powder, ferrosilicon powder, ferromanganese powder, ferrotitanium powder, ferromolybdenum powder, ferrovanadium powder, ferroboron powder, calcium fluoride powder and nickel powder; the balance is iron powder; the outer skin is a low-carbon cold-rolled steel strip, the diameter is 2.4-3.2 mm, and the filling rate is 42-50%; the surfacing method comprises the steps that pretreatment and drying are conducted, plasma arc automatic surfacing is adopted, the current ranges from 135 A to 180 A, the welding speed ranges from 350 mm / min to 650 mm / min, the wire feeding speed ranges from 1800 mm / min to 2200 mm / min, compressed gas and protective gas are both argon, and the surface temperature of the high manganese steel lining plate is controlled; through solid solution of the nickel powder and weak self-protection of the calcium fluoride powder, the surfacing layer is high in hardness, high in wear resistance, small in matrix deformation and free of interface cracking.

This invention provides a novel method for the efficient separation and preparation of 4N quartz from high-silicon iron ore waste. This method employs an innovative multi-stage strong magnetic separation and a two-stage ternary acid washing process, increasing the iron concentrate grade to 60% while simultaneously producing 99.99% high-purity quartz. Compared to existing technologies, this invention not only optimizes the process flow but also significantly reduces environmental pollution and operating costs, improves the utilization efficiency of useful components in high-silicon iron ore waste, and effectively addresses the challenge of high-quality quartz resource shortages. Particularly in the sulfuric acid-phosphoric acid-hydrofluoric acid ternary acid washing stage, this technology demonstrates significant advantages in purification effect, environmental performance, and cost control, providing a more environmentally friendly and economical solution for the resource utilization of high-silicon iron ore waste.

The invention provides a vacuumizing seamless flux-cored wire and a filling process thereof, the vacuumizing seamless flux-cored wire comprises a seamless welding wire skin and a welding wire flux core, and the seamless welding wire skin is of an integrally formed hollow structure with the two ends open; the hollow part of the seamless welding wire skin is filled with the welding wire flux core in a vacuumizing mode; the welding wire flux core comprises, by weight, 30-35 parts of rutile, 12-16 parts of ferrosilicon powder, 4-6 parts of nickel powder, 5-8 parts of manganese-iron alloy, 2-4 parts of chromium powder, 3-6 parts of dolomite, 2-3 parts of fluorite, 0.5-1 part of niobium powder and 1-2 parts of titanium-boron alloy. The seamless welding wire outer skin can effectively block outside air and moisture, so that the welding wire flux core is not prone to being affected with damp, it is guaranteed that the flux-cored wire is reliably used and stored for a long time in various environments, the consistency and reliability of the welding quality are effectively improved, and the production cost and the maintenance difficulty are reduced.

The utility model relates to a novel wet carbide slag magnetic separator which comprises a rack, a magnetic roller, a guide chute and a material chute are arranged on the rack, the guide chute is located on one side of the magnetic roller, and the material chute is located below the magnetic roller and the guide chute; a water guide pipe is arranged on the upper portion of the side face of the material guide groove. The material chute obliquely extends downwards from the lower part of the guide chute to the lower part of the magnetic roller; and the lower part of the material chute is connected with a vibrating feeder. According to the wet-type carbide slag magnetic separator, the water guide pipe, the connecting flange and the like are combined with the vibrating feeder and applied to the wet-type carbide slag magnetic separator, and materials are uniformly spread in the inclined material chute under the dual effects of water flow and vibration, so that carbide slag mixed with silicon iron ore can be effectively separated, and the wet-type carbide slag magnetic separator is compact in equipment structure and convenient to use; moreover, flushing structures such as a water guide pipe and a connecting flange are adopted, so that the high-dust property and high-alkali corrosivity of carbide slag can be greatly reduced, and the damage to equipment parts caused by the carbide slag is reduced, so that the service life is prolonged, and the equipment reliability is high.

The invention discloses a plugging opening robot for a ferrosilicon heat furnace. The plugging opening robot comprises a transverse rail, a transversely-movable bearing vehicle, a hole opening unit and a hole plugging unit. Wherein the hole plugging unit is provided with a side-by-side double-stemming stock bin used for storing and rapidly switching feeding. The stock bin comprises a stock bin connecting box body and a built-in sliding feeding device, and two side-by-side U-shaped through grooves are machined in the sliding feeding device and used for storing pug. When the pug in one U-shaped groove is used up and needs to be supplemented for the second time, the driving mechanism can drive the sliding feeding device to transversely move in a short time, the other U-shaped groove full of the pug is rapidly aligned with the feeding channel of the hole plugging unit, and therefore rapid secondary feeding is achieved. According to the method, the whole machine does not need to be moved or a second device does not need to be used, secondary plugging can be completed only through rapid switching of the internal stock bins, the material supplementing interval is greatly shortened, the splashing risk of the furnace mouth is effectively restrained, and the continuity and safety of hole plugging operation are improved.

The invention relates to the field of ferrous metallurgy, in particular to a novel low-melting-point additive suitable for high-aluminum iron ore and a sintering method of the novel low-melting-point additive. The low-melting-point additive used in the invention is mature in preparation process, environment-friendly, low in preparation cost, free of extra equipment investment, low in addition proportion in the sintering process, free of increasing the production cost of the sintering procedure, wide in industrialization prospect, capable of being applied to iron ore resources such as high-aluminum iron ore and low-silicon iron ore, and suitable for industrial production. And the sintering temperature in the sintering process is obviously reduced. The method is different from a conventional low-carbon sintering process, high-aluminum iron ore low-carbon sintering can be achieved under the ultrahigh alkalinity, the method conforms to the structure that the high-aluminum iron ore is applied to the blast furnace slag in a full-proportion mode, meanwhile, the high-aluminum iron ore sintering product quality index is remarkably improved, and the carbon emission is greatly reduced.

The invention provides a method for controlling the nitrogen content in the oriented silicon steel smelting process, and relates to the technical field of ferrous metallurgy. Ferro-silicon nitride is added twice in the vacuum treatment stage of RH refining to adjust the nitrogen content of molten steel; the addition amount of the silicon iron nitride for the second time is calculated based on the addition amount of the silicon nitride added for the first time, the increase amount of the nitrogen content in the molten steel after the silicon nitride is added for the first time and the target increase amount of the nitrogen content in the molten steel after the silicon nitride is added for the second time through a preset calculation model; the addition amount of the silicon iron nitride for the second time is obtained on the basis of the yield of the nitrogen element after the silicon nitride is added for the first time in the same furnace, so that the influence of the difference of various process parameters of different furnaces on the yield of the nitrogen element is avoided; the difference between the content of the nitrogen element in the RH refining outbound molten steel and the target nitrogen content of the RH refining outbound molten steel is small, and accurate control over the content of the nitrogen element in the RH refining outbound molten steel is achieved.

This invention discloses an ultrasonic-enhanced selective leaching method for the resource utilization of zinc-containing baghouse dust, belonging to the field of metallurgical dust and sludge comprehensive utilization technology. The method involves low-temperature calcination to activate the zinc-iron spinel structure, combined with a weakly acidic leachate for selective leaching of zinc under mild conditions, further enhanced by ultrasonic-enhanced mass transfer, significantly improving the leaching rate and selectivity of zinc. The leachate is purified to obtain nano-zinc oxide, and the leaching residue is co-sintered with high-silicon iron tailings to form glass-ceramic materials. This invention achieves efficient zinc recovery and full-component resource utilization of the residue, avoiding the use of strong acids and the problem of iron co-dissolution. It achieves high-value comprehensive utilization of valuable metals such as zinc and iron in baghouse dust under low-energy consumption and low-pollution conditions.

The invention discloses an iron ore granulation consolidation material, a preparation method and system and a fluidized bed direct reduction method and system by using the iron ore granulation consolidation material, and aims to realize regulation and control of granularity and structure of raw materials through iron ore grinding granulation and roasting consolidation and greatly improve raw material adaptability and reduction efficiency of a fluidized bed direct reduction process. Medium-low-grade and medium-high-silicon iron ore raw materials can be used, and bonding in the reduction process is effectively inhibited; efficient reduction of the iron ore is achieved through preheating and multi-stage reduction of the hot-state consolidated material, and the metallization ratio is 95% or above; physical energy and chemical energy of flue gas are fully utilized through a flue gas circulation process, and the utilization rate of hydrogen in the system can reach 100%; dust in the production process is returned to a granulation section, so that the metal yield is high; and green hydrogen reducing gas and green electricity are adopted for heating, so that zero carbon emission can be realized. The method has the advantages of being wide in raw material adaptability, high in production efficiency, easy to scale and the like, and has popularization significance.

The invention relates to the technical field of ironmaking production, in particular to a preparation method of fluxed titanium-containing magnesian pellets, which comprises the following steps: taking pretreated titanium-containing sintered return ore as a pelletizing core, taking pretreated sea sand ore and low-silicon iron concentrate as adhesive powder, and adjusting the iron ore matching proportion in the adhesive powder and optimizing roasting parameters according to the granularity of the pretreated titanium-containing sintered return ore to prepare the fluxed titanium-containing magnesian pellets. The method for preparing the high-quality fluxed titanium-containing magnesium pellets specifically comprises the following steps that S1, marine placer pretreatment is conducted; s2, pretreatment of the titanium-containing sintered return mine; s3, preparing a pellet material; s4, preparing pellets; and S5, pellet roasting. The method has the beneficial effects that the metallurgical performance of the fluxed titanium-containing magnesium pellets is improved, and the production cost of the pellets is reduced.

The invention provides pellets produced by using low-sulfur Mongolia concentrate, the content of TFe in the pellets is 62.5%-65.5%, the content of SiO2 is 3.0%-6.0%, and the reduction expansion rate of the pellets is less than 20%. The pellet is prepared from the following raw materials in parts by mass: 40-50 parts of iron ore concentrate, 10-50 parts of low-sulfur Mongolia concentrate, 10-60 parts of high-silicon iron concentrate, 1-3 parts of bentonite and 1-5 parts of silica stone. According to the method, low-sulfur Mongolian concentrates in different proportions are used for replacing outsourced concentrates, the production operation problem that raw materials for a large belt type pellet roasting machine are insufficient is solved, and the application effect is remarkable.

The fasteners for chain-type accessories can be easily removed when needed, and the magnetic force is not transmitted to the surrounding area on the magnetic surface where it is not originally needed. This prevents magnetic clasps from attracting each other when multiple chain-type accessories are displayed side by side on display shelves, etc., and also prevents magnetic clasps from attracting to bag fittings when a hand is placed in a bag. [Solution] A fastener for a chain-like accessory is provided with a pair of magnets 2 at the fasteners at both ends of the chain 3 of the chain-like accessory, and the surfaces other than the joining surface 2a of the magnets are surrounded by a magnetic shielding material 4. The magnetic shielding material is made of iron, permalloy, sendust, or silicon copper, and a gap 5 is interposed between the magnet and the magnetic shielding material.

The invention discloses a kind of welding high manganese steel lining plate's impact wear resistant flux-cored wire and surfacing method, belong to surface engineering technical field, for the problem such as traditional high manganese steel lining plate brittle crack, surfacing layer peeling and deformation, flux-cored wire: high-carbon chromium iron powder, micro-carbon chromium iron powder, graphite powder, silicon iron powder, manganese iron powder, titanium iron powder, molybdenum iron powder, vanadium iron powder, boron iron powder, calcium fluoride powder, nickel powder, the balance is iron powder;Outer skin is low-carbon cold-rolled steel strip, diameter 2.4~3.2mm, filling rate 42~50%;Surfacing method: pretreatment, drying, adopt plasma arc automatic surfacing: current 135~180A, welding speed 350~650mm / min, wire feeding speed 1800~2200mm / min, compressed gas and protective gas are argon, control high manganese steel lining plate surface temperature;The invention realizes that surfacing layer hardness is high, wear resistance is strong, substrate deformation is small and there is no interface cracking by nickel powder solid solution, calcium fluoride powder weak self-protection.

The invention discloses a method for preparing sintered ore from India high-silicon fine ore. The sintered ore is prepared from, by mass, 5%-10% of India high-silicon iron ore powder, 30%-40% of iron ore concentrate A, 35%-45% of iron ore powder B, 10%-15% of iron ore powder C, 3.5%-8.5% of limestone, 0%-4% of light-burned dolomite, 3.0%-4.5% of quick lime and 4.5%-6.0% of coke powder. Adding water into the raw materials, mixing and granulating to obtain a mixture; and distributing, igniting and sintering the mixture to obtain the sintered ore. The invention aims to provide the method for preparing the sintered ore by utilizing the Indian high-silicon fine ore, the Indian high-silicon fine ore is mixed with other iron materials according to a certain proportion, the quality index of the sintered ore can be effectively improved under the condition that the quality index of the sintered ore meets the blast furnace smelting requirement, and meanwhile, the sintering burdening cost can be effectively reduced.