205results about How to "Good dephosphorization effect" patented technology

An oxygen-nitrogen top blowing converter process for desulfurization is carried out by blowing oxygen-nitrogen at its top while blowing nitrogen or inertial gases at its bottom to desulfurise. Its top blowpipe controls oxygen blowing to desulfurise in two modes, with mixed gases at some ratio or with pure oxygen switched with pure nitrogen, in order to inhibit sputtering and to enhance stirring in smelting pool when sputter occurs by excessive oxidation, so that balance of (P)/[P] in dynamics is improved. It desulfurises better when bottom blowing is weak, can inhibit decarbonise reaction effectively with >70% recovery of Mn in molten iron, also, strengthen blowing at top to stir strongly and shorten pre-treat time, increase rate of desulfurization, control slag elimination in procedure effectively to prevent sputtering, and increase stability and security.

The invention belongs to the technical field of convertor steelmaking, and provides a convertor steelmaking method capable of reducing slag quantity. The process flow disclosed by the invention is circular process flow starting with step of protecting a furnace by slag splashing and ending with the step of remaining slag in the furnace. The process flow specifically comprises the following eight stages: protecting a furnace by slag splashing; curing liquid slag in the furnace; adding scrap steel; adding molten iron; blowing-dephosphorizing at a first stage; deslagging in the middle; blowing-decarbonizing at a second stage; tapping; and remaining slag in the furnace. Compared with the conventional convertor steelmaking process, the convertor steelmaking provided by the invention has the beneficial effects that lime consumption is lowered by 40.5%, light-roasting dolomite consumption is lowered by 76.8%, and the total consumption of the lime and light-roasting dolomite is lowered by 55.5% on the premise that phosphorus content at the end point is not more than 0.015%.

The invention relates to the technical field f convertor steel making in metallurgy industries, in particular to a method for smelting low-phosphorous steel through combined steel-tapping slag-left and double slag process technology, which aims at providing convertor technology for producing the low-phosphorous steel. The method prolongs previous dephosphorization blowing time, thereby prolonging reaction time of steel slag in a previous blowing stage, improving reaction temperature of dephosphorization steel slag in previous blowing, improving dynamics and thermodynamics conditions of steel slag reaction, improving dephosphorization effect in previous blowing and enabling phosphorus in steel liquid to be absorbed in slag as much as possible. Slag with high P2O5 content is poured out of a convertor so as to reduce phosphorus content of the whole convertor system, providing favorable conditions for dephosphorization in a later decarburization blowing stage and achieving the purpose of producing the low-phosphorous steel. Compared with other methods for producing the low-phosphorous steel, the method for producing the low-phosphorous steel has the advantages of being simple in operation methods, low in cost, easy to obtain and the like.

The invention relates to an efficient dephosphorization method of a combined blown converter. The method comprises the steps of: subjecting molten iron to desulphurization, and adding determined scrap steel cold material to the desulfurized molten iron; adjusting the position of an oxygen lance and open blowing parameters; adding a first batch of material, thoroughly melting, lowering the position of the oxygen lance by lowering the position of the spray nozzle of oxygen lance by 40-50 mm every 20-30 s, and adding 2.14-4.44 kg / t of active lime every time before lowering the position of the spray nozzle of the oxygen lance; lowering the position of the oxygen lance to 1500-1600 mm, fixing, adding all the residual active lime and controlling the open blowing oxygen pressure of the spray nozzle of the oxygen lance at 0.83-0.85 Mpa; converting 6-8 min, adding the remaining sinter and grain steel in molten iron by batches under addition amount of the sinter and grain steel of 3.0-6.22 kg / t respectively each batch and feeding interval of 35-60 s, adding all the sinter and grain steel; continuing converting for 3-5min, using a sublance TSC probe to measure temperature of the hot metal and sampling, after measurement of carbon temperature by the sublance TSC probe, adjusting the oxygen pressure of the oxygen lance to 0.83-0.85 Mpa, continuing lowering the position of the oxygen lance to 1200mm until the end of the blowing, and hoisting the oxygen lance; and tapping.

The invention belongs to the technical field of electric arc furnace steelmaking and particularly relates to a full-steel-scrap electric arc furnace cleanness rapid smelting method which is applicable to the 30-300t full-steel-scrap electric arc furnace smelting process. According to the full-steel-scrap electric arc furnace smelting process, spray guns buried in refractory materials on the side faces of the furnace bottom of an electric arc furnace are used for blowing different types of media at different smelting stages; at the stage of recarburization and melting acceleration, melting-down of a molten pool is accelerated through carburization, and the carbon content of the molten pool is increased. At the stage of high-efficiency dephosphorization and deep denitrification, molten pool reaction is intensified to conduct high-efficiency dephosphorization and deep denitrification. Accordingly, the smelting rhythm of the full-steel-scrap electric arc furnace is accelerated, the dephosphorization and denitrification effects are improved, the cleanness of molten steel is improved, and full-steel-scrap electric arc furnace cleanness rapid smelting is realized.

The invention discloses a dephosphorization flocculating agent and a preparation method thereof. The dephosphorization flocculating agent is formed by compounding an inorganic flocculating agent and an organic flocculating agent. The raw materials of the inorganic flocculating agent comprise sodium ferrate, borax, ferrous sulfate, silicate or aluminate; the raw materials of the organic flocculating agent comprise modified chitosan or modified polyacrylamide. The preparation process comprises the following steps: firstly adding a non-oxidizing acid into the silicate or aluminate to obtain a polysilicate colloid or an aluminum hydroxide colloid, then adding a borax solution and a sodium ferrate solution sequentially while stirring, further dropping a ferrous sulfate solution, mixing to form the inorganic flocculating agent, standing, then adding the modified polyacrylamide or modified chitosan into the inorganic flocculating agent, curing and adding the acid till the pH value is less than 7 to obtain the finished dephosphorization flocculating agent. The flocculating agent is suitable for a wide range of water quality, is little affected by co-existing salts, the pH value of sewage and temperature and is particularly effective for dye wastewater, oilfield sewage and the like.

The invention particularly relates to a dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction, and the technical scheme comprises the following steps: mixing 60-83wt% of high phosphorus hematite powder, 10-15wt% of carbonaceous reducing agent, 6-15wt% of quicklime and 1-10wt% of additive uniformly, pressing the mixture into blocks, drying, reducing in a high temperature furnace under 1250-1350 DEG C, and keeping the temperature for 15-30 minutes; carrying out furnace cooling until the temperature is 600-800 DEG C, taking the reduction product out, naturally cooling, grinding and performing the magnetic separation to obtain pig iron particles. The additive is sodium carbonate, or potassium carbonate, or the mixture of the sodium carbonate and the potassium carbonate; drying is carried out under the condition of 110-120 DEG C until the weight of the mixture of raw materials is constant; and the high temperature furnace is a resistance furnace, or a rotary kiln, or a rotary hearth furnace, and the atmosphere in the high temperature furnace is neutral or weak-reductive. The invention has the advantages of short reduction time, simple process, high dephosphorization rate, high iron yield, less environmental pollution, recyclable residue and the like.

The invention relates to a domestic sewage phosphate removing agent which includes a phosphate removing agent A and a phosphate removing agent B. The phosphate removing agent A is prepared from, by weight, 6.25 parts of polymeric aluminum, 5.42 parts of attapulgite, 2.15 parts of aluminum sulfate and 2.36 parts of ferrous sulfate. The phosphate removing agent B is prepared from, by weight, 1.85 parts of polymeric aluminum, 6.4 parts of polyvinyl alcohol and 2.15 parts of ferrous sulfate. According to the domestic sewage phosphate removing agent A and domestic sewage phosphate removing agent B, raw materials contain common water treatment agents, phosphate removing effect of the phosphate removing agent is greatly improved under PH (potential of hydrogen) conditions of the phosphate removing agent after the phosphate removing agent is compounded, high-phosphorus domestic sewage is treated by the method, and the content of phosphate in the treated sewage can be reduced to 0.25mg/L and reaches or is lower than national standards.

A method for dephosphorizing from phosphor-containing iron ore is disclosed, wherein phosphor-containing iron ore is broken to the granularity of less than 0.074mm and mixed with iron pyrite prebroken to the granularity of less than 0.074mm based on mass percent of 5%-20%, the mass concentration of ore slurry is adjusted to 10%-20% by the aphosphorosis 9K culture and pH of original ore slurry is in the range of 1.5 to 3.5, then noculating ferrous and sulfur oxide bacilli lysate of 2% -10% mass percent in which bacteria is cultrued by 9K culture beforehand ro reach exponential phase of growth in ore slurry, extracting dephosphorization, solid-liquid separation after 30 -45 days, and the solid is iron ore concentrate. The invention is suitable for direct-extracting dephosphorizing from each phosphor-containing iron ore microbe, the ore dephosphorizing yield can be exceeded 80%, The content of phosphorus satisfies the requirement of blast furnace ironmaking materials, and having comprehensive utilization of iron pyrite. The process provides a reliable technical support for developing rich high phosphorus iron ore in our country with low cost and good dephosphorization.

A method for producing high carbon steel through double-slag high drawing carbon tapping belongs to the technical field of smelting high carbon steel through a converter. The method comprises processing steps as follows: molten iron and steel scraps are loaded in the converter according to a certain molten iron ratio; in a first stage of converter steelmaking, the converting is performed at the oxygen supplying intensity of 2.8 Nm<3>/min/t, active lime and ore fluxing mediums are added in the converter, and a larger bottom blown flow rate is adopted to stir; the converting is performed at a standard lance height in the prior period for the converting of the converter, and then the lance height rises gradually; part of furnace slag is dumped through a rocking furnace; in the second stage for the converting of the converter, the converting is performed at the oxygen supplying intensity of 3.3 Nm<3>/min/t, and active lime and the ore fluxing mediums are added in the converter; the lance height rule that the converting is performed at a higher lance height in the later period and the lance height descends stage by stage is adopted; a small quantity of ores and fluorites are added frequently within 80 to 90 percent of total converting oxygen consumption; after the converting of the converter is finished, deslagging is performed through the rocking furnace of the converter, and temperature measurement and sampling are carried out; and converter tapping is carried out. The method has the advantage of overcoming the shortages of serious rephosphoration caused during the tapping process, low production efficiency, and so on.

The invention relates to a high-phosphate oolitic iron ore dephosphorization method. The raw ore is roasted at the temperature of between 400 DEG C and 800 DEG C after crushing, high intensity magnetic separation is carried out after ore grinding, and acid leaching is carried out to ore powder by using industrial sulfuric acid or industrial nitric acid or industrial hydrochloric acid with the proportion being: 4 percent to 10 percent of acid:90 percent to 96 percent of water; the soaking time is 1.5 to 5 hours; phosphorus is obtained by vibration cleaning ore powder by using ultrasonic waves with the frequency being 4000 hertz to 20 000 hertz and vibration time is 15 to 20 minutes, and then concentrates and middlings are picked out by using low intensity magnetic separation. The dephosphorization method has the advantages of low dephosphorization cost, simple dephosphorization technology and equipment and good dephosphorization effects.

The invention discloses an exothermic agent for converter molten iron with a low heating value, which comprises the following components in percentage by weight: 31-44 percent of carbonaceous material, 35-48 percent of siliceous material, 6-14 percent of bauxite, 4-10 percent of iron granules or scrap iron and 4-8 percent of binder, and the bulk specific weight of the exothermic agent is 2.2-3.5ton/m<3>. The exothermic agent for the converter molten iron with the low heating value has the characteristic of raising the temperature obviously and promoting slagging for low-silicon and low-temperature molten iron, and can improve the dephosphorizing capability of converter slag.

The invention belongs to the technical field of converter steelmaking processes, and particularly relates to a method for smelting high-phosphorus molten iron to produce steel with converter end pointP less than or equal to 0.01% by adopting slagless material. The method comprises the following steps that loading low-silicon high-phosphorus molten iron and steel scrap which are not subjected to triple-removal pretreatment into a converter, a single-slag method is adopted to carry out blowing, a slagging material is added twice in a blowing process and a gun position control mode of high, low, high and low is adopted in the blowing process, and oxygen supply and nitrogen supply are carried out in the blowing process; after the blowing is completed, the steel is discharged, slag splashingis carried out after the steel is discharged, slag is reserved after the slag splashing, and is used for smelting in the next furnace. According to the method, on the premise that lime consumption ofa steel liquid is less than or equal to 30 kg/t, and the consumption of the new slag material is less than or equal to 50 kg/t, dephosphorizing of the molten iron with the following components, by weight, 0.14-0.26% and Si, 0.15-0.20% of P is carried out until P is less than or equal to 0.01%, and a dephosphorization rate is larger than or equal to 94%, so that the problem that low-phosphorus steel is smelted by a low-silicon high-phosphorus molten iron with the few slag material in the single-slag method is solved.

The invention relates to arc furnace deep dephosphorization technology and a deep dephosphorization agent thereof. The arc furnace deep dephosphorization technology comprises the following steps of: melting steel by using slag, performing deep dephosphorization and preparing foamed slag, and is characterized in that lime and the deep dephosphorization agent are added after the addition of scrap steel and before complete melting of the scrap steel in parts so as to enhance the deep dephosphorization effect. The deep dephosphorization agent consists of the following components in percentage by weight: 25 to 40 percent of lime, and 60 to 75 percent of ferric oxide powder. The method for preparing the dephosphorization agent comprises the following steps of: smashing the raw materials into 100 to 150 meshes and uniformly mixing; and premelting the materials at the high temperature of between 1,200 and 1,550 DEG C, cooling and processing into granules with the diameter of 3 to 50 mm. Compared with the prior art, the invention has the advantages that: the deep dephosphorization technology and the deep dephosphorization agent are adopted for deep dephosphorization, the lime is not added before charging, and the lime and the deep dephosphorization agent are added after charging and before complete melting of the materials in parts to enhance the deep dephosphorization effect, so that the tapping phosphorus is reduced to 0.0030 percent or even lower.

The invention relates to a plurality of assistant materials of slagging materials and a preparation method, belonging to metallurgy field, which is characterized in comprising the components in the following weight matching: steel slag of converter 8.0 to 9.5 shares and addition agent 0.5 to 2 shares; wherein, the addition agent comprises the components in the following weight percentage: Na2CO3 is 5.00 to 10.00 percent, FeO is 70.00 to 80.00 percent and BaCO3 is 10.00 to 20.00 percent. The assistant materials of slagging materials can be used in slagging and also used as slugging agent and dephosphorizing agent. The invention achieves the recycle utilization of the steel slag of converter, therefore has the advantages of lowering the amount of waste slag during steel-making, saving the dosages of current slagging material: lime and dolomite and improving the slagging performance, and also has the advantages of slagging rapid, sludging rapid and dephosphorizing effectively. The invention provides a new method to recycle the steel slag of converter for people.

The invention relates to a comprehensive utilization method of dust and mud in steelmaking process, which is specifically a spheroiditic slagging agent production process. The invention comprises the following steps: drying dust and mud in the open, adding 2-6% burnt lime and 0.5-1% adhensive to the mud to produce mixture, sending the mixture to agitator to intimate mixing, sending the mixture to roller to be pulverized fully, sending it to pelletizer to produce green-ball of phi20-phi30mm size by roll-type briquetting process in presure of 40-60KN, processing green-ball in jigging screen to get green-ball end product on sifter and sliver as return material under sifter and sending green-ball to tower furnace via charging system to be adglutinate and get end product.

The invention relates to the technical field of biochar, and especially relates to a lanthanum modified biochar, and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: pyrolyzing sheep manure to obtain sheep manure biochar; and washing the sheep manure biochar, dipping the washed sheep manure biochar in a lanthanum chloridesolution, and adjusting the pH value to 8-11 to obtain the lanthanum modified biochar. According to the record of the embodiment, the adsorption capacity of the lanthanum-modified biochar prepared bythe preparation method in the technical scheme on phosphate can reach 58.33 mg/g at most.

The invention relates to the field of bottom blowing oxygen converter steelmaking, and provides a bottom blowing oxygen converter smelting process control method based on molten steel continuous temperature measurement. A temperature measurement spraying gun is installed at the furnace bottom of a bottom blowing oxygen converter to measure the temperature of molten steel in the converter, molten steel ingredients are forecasted in real time according to the molten steel temperature and the converter blowing and feeding conditions, staged control over the smelting process of the bottom blowingoxygen converter is carried out based on the molten steel temperature, the spraying parameters of the bottom blowing spraying gun are dynamically adjusted, and optimum control and double hitting of the final molten steel temperature and the carbon content in the smelting process are achieved. A new method is provided for the process and the terminal control of the bottom blowing oxygen converter,the double hitting rate of the final molten steel temperature and the carbon content is improved by 10%, the final molten steel phosphorus content can be stably controlled within 80 ppm, and consumedsteel is reduced by 10 kg/t.

The invention relates to a method for producing molten iron by directly utilizing coal to deoxidize iron ore under smelting state, belonging to the technical field of energy source and metallurgy. The method comprises the following steps: charging iron ore, dolomite, lime and deoxidized coal are crushed, the crushed for materials are evenly mixed according to a certain proportion and added to a smelting reducing furnace from a material inlet at the top of the smelting reducing furnace; a central nitrogen pipe of a spray gun is inserted into a slag layer of a smelting pool to spray nitrogen to stir the slag layer, and one period of reaction, smelted high-temperature molten iron and slag are respectively discharged from an iron outlet and a slag outlet, wherein the oxygen jacket of the spray gun is higher than the smelting slag. In the method, raw materials do not need to be treated in advance so that a coking procedure is omitted and the environment pollution is reduced; coal of various levels can be used as fuel; the oxidizing atmosphere in the furnace is very strong so as to be very beneficial to dephophorization; and investment for the construction is low and can be recovered in a short time.

The invention discloses a vanadium-titanium nodular cast iron smelting method which comprises the steps of weighing furnace burden, smelting, spheroidizing and inoculating, wherein the smelting step comprises the sub-steps: adding oxide scale of which the addition amount is 0.5-1.5 percent of the weight of the furnace burden, and adding the oxide scale at the bottom of the furnace burden during smelting and charging; in the smelting step, after the furnace burden is molten down, adding silicon iron into molten iron for regulating the components, so as to achieve the deoxidation effect. The method has the beneficial effects that the low-price oxide scale is added into the bottom of the furnace burden during charging, and the element Ti is oxidized preferentially, so that the titanium content is reduced, the inverse spheroidizing effect of titanium is weakened, nodularizing in vanadium-titanium ductile iron is guaranteed, and a good dephosphorization effect is achieved when the oxide scale is added during smelting; the oxide scale is wide in source and low in price, the oxide scale is reasonably utilized, the production cost can be reduced, and the environment-friendly energy-saving effects are achieved. According to the method, the process is simple, the operation is convenient and the cost is low, and the comprehensive performance of the vanadium-titanium nodular cast iron is guaranteed.

The invention relates to the field of water treatment, in particular to a composite water purifying agent and a preparation method and application thereof. The composite water purifying agent is mainly prepared from polymeric ferric sulfate, dimethyl diallyl ammonium chloride, vinyl trimethoxy silane and polysilicic acid. The total amount of iron and the pH value of the composite water purifying agent are limited, the combination of organic components and inorganic components is closer, the flocculation capability of obtained flocculating constituents is greatly improved, and the composite water purifying agent has a good effect of removing phosphorus in water. According to the special preparation method, the combination of the organic components and the inorganic components forming the composite water purifying agent is closer, and the flocculation capability of the flocculating constituents is improved. The method is simple and easy to operate, does not produce harmful gas in the production process, and is safe and reliable. The composite water purifying agent is applied to treatment for phosphorus wastewater, has the advantages of being less in feeding amount, compact in flocculating constituents, high in sedimentation velocity, good in water-out effect, less in sludge quantity and low in treatment cost, and has significant social and economic benefits.

The present invention relates to super high power arc furnace smelting technology, and is especially slag regulating agent for super high power large electric furnace. The present invention features that the slag regulating agent consists of C 30-35 wt%, Al 5-7 wt%, MgO 8-10 wt%, Al2O3 10-12 wt%, CaO 20-25 wt%, SiC 9-10 wt% and impurity the rest, and has bulk density of 1.8-2.0 g/cu cm. The slag regulating agent of the present invention can form homogeneous foamed slag continuously in the furnace to reduce FeO, Fe2O3, etc. in the slag layer, raise smelting yield, raise steel alloy yield, raise the heat efficiency of the furnace, lower power consumption, raise the dephosphorization capacity of the furnace and prolong the service life of the furnace.

The invention discloses a converter smelting method for improving end molten steel remainder Mn with medium-high-Mn, high-P and low-Si molten iron (C4.20-4.60wt, Mn 0.90wt%-1.15wt%, Si 0.05-0.15wt%, P0.100-0.130wt% and S smaller than or equal to 0.040wt%). Integrated innovation is conducted on processes such as slag retention operation, continuous casting residual slag application, low-alkalinityslagging process, constant-pressure low lance position operation in the smelting process and tapping slag washing in the whole process, smelting reaction dynamics and thermodynamic conditions are optimized, the distribution concentration of MnO in slag in the smelting process is increased, better smelting slagging and dephosphorization effects are obtained under the conditions of little slag andlow-alkalinity slag systems, rephosphorization of molten steel in the later period of smelting and the tapping process is reduced to the greatest extent, the content (0.43wt%-0.55wt%) of end point molten steel residual Mn is significantly increased, the addition amount of Mn alloys in the deoxidation alloying process is reduced, the steelmaking alloy consumption and alloying cost are significantlyreduced, the economic indexes of the smelting technology is improved, and the market competitiveness of products is improved.

The invention relates to a double-slag-method smelting process, belongs to the technical field of converter steelmaking, and solves the problems of poor dephosphorization effect, high slag material consumption, slag not easy to pour out, long smelting cycle and peroxidation of molten steel in an existing smelting process. The double-slag-method smelting process specifically includes dephosphorization of molten iron, dephosphorization slag discharge, and high-strength oxygen-supplying decarburization steelmaking with less slag; the step of dephosphorization of molten iron includes top-bottom oxygen combined blowing for rapid desiliconization and demanganization, and oxygen blowing at top and inert gas blowing at bottom for dephosphorization; the step of dephosphorization slag discharge includes control on foamed dephosphorization slag, pressing of foamed dephosphorization slag, and purging of foamed dephosphorization slag; and the step of high-strength oxygen-supplying decarburization steelmaking with less slag includes high-strength top-bottom oxygen combined blowing decarburization steelmaking, low-strength top-bottom oxygen combined blowing decarbonization steelmaking, low-strength top-bottom oxygen combined blowing carbon-pulling tapping, and bottom inert-gas blowing tapping. The process disclosed by the invention realizes optimal combination of top oxygen blowing, bottom oxygen blowing and supplying technology of inert gas, realizes reasonable matching of technologies of adding blocky slag materials at top and blowing a powder at bottom, and realizes efficient dephosphorization, low slag material consumption and efficient smelting with less slag.