61results about How to "Reduce titanium content" patented technology

A process for preparing iron oxide yield pigment from ferrous sulfate as the by-product of titanium oxide includes such steps as reducing iron scale at 50-70 deg.c, hydrolyzing for 6-10 hr, flocculating, deposition, refining ferrous sulfate, neutralizing with ammonia to generate crystal seeds, and neutralizing with ammonia while oxidizing with air to obtain target product. Its by-product, solution of ammonium sulfate, can be used for preparing composite fertilizer.

The invention relates to low nitrogen, low-aluminum ferrotitanium and a manufacture method and an alloy cored wire thereof. The low nitrogen and low-aluminum ferrotitanium is 70Fe-Ti alloy, comprising the impurity elements such as nitrogen, aluminum, silicon, carbon, phosphorus, and sulfur and so on, the content of nitrogen is less than or equal to 0.08 percent and the content of aluminum is less than or equal to 0.5 percent. The content of titanium is 60 percent to 80 percent, the content of silicon is less than or equal to 0.5 percent, the content of carbon is less than or equal to 0.1 percent, the content of phosphorus is less than or equal to 0.04 percent, and the content of sulfur is less than or equal to 0.03 percent, the rest is ferrum. The manufacture method is as follows: in a common smelting method, the industrial salt is used as slagging constituents during the smelting; the sponge titanium, waste titanium, high quality steel scraps or ferroferrite comprising the impurity elements, such as nitrogen, aluminum, silicon, carbon, phosphorus, and sulfur, etc. with low content are used as alloy raw materials, the raw materials are briquetted before smelting; the smelting is carried out in an argon smelting furnace or a consumable electrode vacuum furnace. The low nitrogen and low-aluminum ferrotitanium used as the alloy raw material is applied in manufacturing the high grade steel such as stainless steel, which requires titanium to be used as stabilization alloy element or alloy strengthening element to obtain good combination property in strength, plasticity, ductility, and inoxidability, etc. and which also requires low content of the impurity elements such as nitrogen, aluminum, silicon, carbon, phosphorus, sulfur, etc.

The invention belongs to the mesopore material preparation field, concretely relates to a synthetic method for a mesopore titanium-silicon molecular sieve. The method is characterized in that a low temperature rapid crystallization method is used, an inorganic silicon source and an inorganic titanium source are taken as the raw materials, a quaternary ammonium cationic surfactant is taken as a template agent, a Ti-MCM-41 molecular sieve with an ordered mesoporous structure and high specific surface area can be obtained through product recovery. Compared with the preparation method of the traditional Ti-MCM-41 molecular sieve, the method uses the inorganic silicon source and the titanium source as the raw materials, simultaneously the auxiliary template agent is avoided to use, so that the generation of TiO2 outside of a framework is reduced, the synthetic process is simplified and the synthesis cost is reduced; The method of the invention uses the low temperature rapid crystallization method and avoids a hydrothermal synthesis method, and has the advantages of simple operation, easy repetition, short synthesis time, low equipment requirement, easy process control and the like.

The invention discloses a method for concentrating and purifying titanium dioxide waste acid by using complex acid. The method comprises the following specific steps of: titanium recovery: primarily concentrating waste acid produced in a titanium dioxide production process by using waste heat of calcining tail gas of a ring kiln to achieve the mass concentration being 25-32%, and then recovering titanium; acid mixing: uniformly mixing the waste acid subjected to titanium recovery and concentrated sulfuric acid in an acid mixing tank according to a mass proportion of (1.2-4):1 to obtain mixed acid; and crystallization: carrying out gradient cooling, crystallizing, curing and filtering on the mixed acid gradually in the acid mixing tank, and when the temperature of the mixed acid is reduced to 60-65 DEG C, pumping the mixed acid into a filter press for solid-liquid separation to obtain concentrated sulfuric acid and ferrous dregs. The method disclosed by the invention has the advantage of changing the traditional method for concentrating the titanium dioxide waste acid by depending on natural gas, steam, fire coal hot gas and other heat sources, is free from consuming a large amount of energy sources and capable of reducing the cost in waste acid concentration, and is high in recovery rate of the waste acid.

The invention discloses a method for catalyzing ammoximation of cyclohexanone. The method comprises the steps as follows: subjecting cyclohexanone, ammonia, oxygen, hydrogen, diluent gas and a solvent to coming in contact with a catalyst. The mole ratio of cyclohexanone, to ammonia, oxygen, hydrogen and diluent gas is 1:(0.1-10.0):(0.1-10.0):(0.1-10.0):(0-100). The mass ratio of the solvent to the catalyst is (20-1000):1. The catalyst is a microporous titanium-silicon material or a compound containing the microporous titanium-silicon material. The composition of the microporous titanium-silicon material is expressed as xTiO2*100SiO2*yEmOn*zE in an oxide form, wherein x ranges from 0.001 to 50.0; the sum of y plus z ranges from 0.005 to 20.0; the ratio of y to z is smaller than 1; E is one or more metal noble metals selected from Ru, Rh, Pd, Re, Os, Ir, P and Au; m and n are numbers required for meeting the oxidation state of the E; and material grains are partially or totally hollow-structured. The method has the advantages of high selectivity of cyclohexanone oxime, high product activity and stability, environment friendliness and low cost.

The invention provides a furnace-protecting material for blast furnaces and preparation and application methods thereof. The furnace-protecting material for the blast furnaces comprises the following components: 30-39% of ilmenite concentrate, 5-8% of CDQ (Coke Dry Quenching), and 51-65% of pulverized coal. The preparation method of the furnace-protecting material for the blast furnaces is implemented through uniformly mixing the CDQ powder with the pulverized coal in proportion so as to obtain a mixture, heating the mixture, dehydrating the mixture, and grinding and separating the mixture; uniformly mixing the ilmenite concentrate with the mixture so as to obtain the furnace-protecting material for the blast furnaces. When the temperatures of bottom and basque detecting couples rise or the temperature difference of cooling water rises, the furnace-protecting material for blast furnaces is injected; the furnace-protecting material is injected after roughing slags in the process of tapping, and after normal coal blending is performed for 2 hours, the furnace-protecting material is injected again; oxygen-enriched injection is performed in the process of injecting the furnace-protecting material. According to the invention, the influence of the titanium content of scrap iron in the slags on the flowability of the scrap iron in the slags can be reduced, so that while the disposal capacity of metallurgical wastes is reduced, the furnace-protecting cost and coke rate of blast furnaces are lowered, the efficiency and effect of furnace protecting are improved, and the service cycle of a furnace hearth is relatively extended.

Titanium dioxide having a ratio Dtop / D50 of 1 to 3, between the maximum particle diameter Dtop and the average particle diameter D50, as determined based on observing the primary particles by a field emission-type scanning electron microscope. A production process of the titanium dioxide comprises performing a vapor phase process of reacting a titanium tetrachloride-containing gas with an oxidative gas to produce titanium dioxide, wherein when the titanium tetrachloride-containing gas and the oxidative gas are reacted by introducing each gas into a reaction tube, the temperature in the reaction tube is from 1,050 to less than 1,300° C.

The invention provides a rotating-platform vacuum filtering machine. The rotating-platform vacuum filtering machine comprises a filtering disc, a feeding port and a discharging screw. The rotating-platform vacuum filtering machine is characterized by also comprising a scraper and a spraying pipe, wherein the scraper is arranged above the filtering disc along the radius direction of the filtering disc; the scraper is arranged between the feeding port and the discharging screw; the spraying pipe is parallel to the scraper. The rotating-platform vacuum filtering machine provided by the invention has the advantages that one or more scrapers and the spraying pipe adaptive to the scraper are additionally arranged, and filtering cakes are cleaned, filtered and discharged in a gradual-progressive and layering manner, so that the filtering effect is improved, the content of titanium entrained in ferrous sulfate is reduced, further the yield of the titanium is increased and simultaneously the treating capability is also improved.

The invention relates to a titanium silicate molecular sieve and a synthetic method thereof. The synthetic method comprises the following steps: mixing a silicon source, a titanium source, a template and water, stirring and hydrolyzing, putting the product into a hydro-thermal synthesis kettle and carrying out a pre-crystallization reaction; mixing the pre-crystallization product and a silicon source, uniformly stirring, carrying out hydro-thermal synthesis, washing and roasting to obtain the TS-1 molecular sieve. The synthesis process of the titanium silicate molecular sieve is easy to control and has good repeatability. Meanwhile, the catalyst has a higher catalytic activity, and use amount of the template is greatly reduced and synthesizing cost of the titanium silicate molecular sieve is decreased. The synthetic method of the invention is convenient for industrial production.

The invention provides a method for preparing a titanium silicon molecular sieve TS-1 with high framework titanium content. The method particularly comprises the following steps: mixing a silicon source and a titanium source according to the proportion, and adding an aqueous solution of quaternary ammonium base to obtain mixed liquid; hydrolyzing the mixed liquid to remove alcohol, adding a starch solution and performing crystallization to obtain a crystallization product; and drying and roasting the crystallization product to obtain the titanium silicon molecular sieve TS-1 with high framework titanium content. According to the method, the starch solution is added in the synthesis process, the silicon source is in bridge connection with the titanium source by utilizing a large amount of hydroxyl groups in the starch, and the silicon source and the titanium source are easy to combine, so that more titanium can enter the TS-1 framework. The titanium silicon molecular sieve prepared with the method has high titanium content and hardly contains extra-framework titanium, and mother liquid can be recycled.

The invention discloses a continuous repaid repairing device of semi-solid slurry of automobile aluminum alloy wheels. The device is composed of a continuous melting refining purification furnace, a slurry rapid stirring device, a slurry transfer crucible and an intelligent assistance arm. The material continuous refining purification furnace, the slurry rapid stirring device and die-casting machines (or die forging machines) are distributed on the circumference of the circle with the intelligent assistance arm as the center; the slurry transfer crucible is mounted on the intelligent assistance arm and inputs the motion program of the intelligent assistance arm to a computer; according to the slurry transfer crucible, in a material taking chamber, a liquid face oxide thin film is put aside, a certain amount of molten aluminum is taken, and then is transferred to the position below a graphite pipe of the slurry rapid stirring device, the graphite pipe is inserted into slurry in the center area of the slurry transfer crucible, and an electromagnetic stirrer in the graphite pipe and an electromagnetic stirrer on the periphery of the slurry transfer crucible are started to carry out electromagnetic stirring; the slurry stirred to be qualified is rapidly transferred to the die-casting machines (or die forging machines) for production. According to the technical scheme, semi-solid slurry continuous and rapid preparing and transferring can be achieved, the slurry is stable in quality, and the device is of great significance in semi-solid production of the automobile aluminum alloy wheels.

The invention discloses a method for producing molten iron under oxygen-rich top-blowing condition by taking mixed high-phosphorus iron ore and ilmenite as raw materials, coal dust as a reducing agent and lime stone or dolomite as a fluxing agent, which comprises the following process steps of: crushing charging materials which are the high-phosphorus iron ore, the ilmenite, the dolomite, lime and reduction coal; proportioning and uniformly mixing the charging materials according to process parameters comprising the alkalinity R of 1.0 to 2.0 and the inner C / O mole ratio of 0.9 to 1.3, and preheating the charging materials; and feeding the charging materials into a smelting reduction furnace from a furnace side, producing the molten iron with relatively lower phosphorus content and relatively lower titanium content under the oxygen-rich top-blowing condition, and periodically discharging the molten iron and slag from a tap hole and a bleed hole. In the invention, the high-phosphorus iron ore and the ilmenite difficult to smelt in a conventional method are treated. The mixed smelting reduces a phosphorus load in the smelting of the high-phosphorus iron ore, can obtain the molten iron with lower phosphorus content, reduces the amount of foamed slag in the smelting of the ilmenite, and is favorable for stabilizing furnace conditions. The method is favorable for developing a great number of high-phosphorus iron ore and ilmenite resources stored in China and enhancing the international competitive power of steel enterprises of China.

The invention provides a low-titanium-content double-layer covering agent for silicon steel and a use method of the low-titanium-content double-layer covering agent. The low-titanium-content double-layer covering agent comprises an upper layer covering agent part and a lower layer covering agent part; the lower layer covering agent part is contacted with molten steel; the upper layer covering agent part is located above the lower layer covering agent part; the upper layer covering agent part comprises the following raw materials, by weight percentage, 44-62% of SiO2, 2-10% of MgO, 1-10% of CaO, greater than 0 and less than or equal to 7% of Fe2O3, 20-38% of Al2O3, greater than 0 and less than or equal to 1% of C (all), greater than 0 and less than or equal to 0.5% of TiO2, and the balance ignition lost; and the lower layer covering agent part comprises the following raw materials, by weight percentage, 15-25% of SiO2, 3-8% of MgO, 48-68% of CaO, 2-10% of Fe2O3, greater than 0 and less than or equal to 1% of Al2O3, greater than 0 and less than or equal to 1% of C (all), greater than 0 and less than or equal to 0.2% of TiO2, and the balance ignition loss. With the use of the low-titanium-content double-layer covering agent, the content of titanium in molten silicon steel can be reduced effectively.

The invention relates to a smelting method of bearing steel, in particular to a preparation method of the bearing steel with the low titanium content. The bearing steel comprises, by mass, no more than 0.0018% of Ti, more than 0.4% of Si (preferably, 0.4-0.6%), and more than 0.9% of C (preferably, 0.90-1.00%). The preparation method comprises the steps of primary smelting, fine smelting, vacuum degassing, pouring and rolling. According to the preparation method, the problem that the titanium content of a bearing steel product is too high is solved under the condition that the smelting cost isnot increased.

The invention discloses low-titanium ferrophosphorus, a preparation method and application. The method comprises the following steps of adding high-titanium ferrophosphorus and adsorption slag into acontainer for melting to obtain a molten product; blowing nitrogen or ammonia gas into the melt from the bottom of the container under the condition of 1500-1650K for blowing; after blowing is finished, deslagging and tapping in a molten state to obtain low-titanium ferrophosphorus, wherein the high-titanium ferrophosphorus comprises the following components, by weight, 22-28% of P, smaller than or equal to 3% of Si, smaller than or equal to 1% of C, smaller than or equal to 0.05% of S, smaller than or equal to 2% of Mn, smaller than or equal to 1% of Cr, 0.1-4% of Ti, and the balance Fe. Theprepared low-titanium ferrophosphorus composition comprises, by weight, 23-25% of P, 1.7-2.8% of Si, 0.8-0.9% of C, 0.05-0.08% of S, 0.8-1.7% of Mn, 0. 6-0.8% of Cr, less than 0.05% of Ti, and the balance Fe. The process flow for preparing the low-titanium ferrophosphorus is short, the process operation is simple, the environmental pollution is small, and the titanium content of the prepared low-titanium ferrophosphorus is less than 0.05%.

The invention belongs to the technical field of metallurgy, and relates to a titanium alloy material and a preparation method thereof, in particular to a titanium-silicon alloy and a preparation method thereof. The titanium-silicon alloy material comprises, by weight, 37-60 parts of Ti and 40-63 parts of Si. The preparation method of the titanium-silicon alloy material comprises the following steps of a, preparing materials, b, mixing uniformly, c, roasting and d, cooling, wherein in the step a, 35.7-38.5 parts of titanium pigment, 26.9-32 parts of silicon powder and 25-34.6 parts of calcium oxide, by weight, are taken; in the step b, the materials prepared in the step a are mixed uniformly; in the step c, the raw materials mixed uniformly in the step b are roasted, the roasting temperature is 1450-1600 degrees and the roasting time is 10-30min; in the step d, the raw materials after the roasting in the step c are cooled, and effective separation between the titanium-silicon alloy and slag is realized. The titanium-silicon alloy is prepared through one-step synthesis by employing an electro-silicothermic process to reduce titanium pigment, the preparation method is simple in technology, the preparation of the titanium-silicon alloy is not required to be carried out in an inert gas or vacuum environment, the energy consumption is low, the titanium-silicon alloy can be produced and prepared in scale, and the titanium-silicon alloy and the preparation method have great application prospects.

The invention discloses a method for quick repair of blast furnace hearth local damage, and the method is used for quick repair of hearth local damage. The method includes: judging a blast furnace hearth temperature anomaly part and hearth damage, then blowing a furnace protection raw material from an air port near the blast furnace hearth temperature anomaly part, at the same time increasing the flow rate of cooling water at the blast furnace hearth temperature anomaly part and enhancing the blast furnace oxygen enrichment rate, using TiO2 containing mineral powder or its mixture as the furnace protection raw material, when slag tapping starts in the tapping process, starting blowing the furnace protection raw material from the air port near the blast furnace hearth temperature anomaly part, and stopping the process when iron slag is discharged completely. Compared with the prior art, the furnace protection raw material is conveyed from the blast furnace air port so as to be quickly sent into the blast furnace hearth, thus enhancing the blast furnace protection efficiency and effect, at the same time reducing the influence of increase of titanium content in iron slag to iron slag fluidity. Moreover, the method provided by the invention can reasonably control the dosage and timing of the furnace protection raw material used by the blast furnace, thus greatly reducing the blast furnace protection cost.

The invention relates to a manufacturing method for high-grade cold-rolled non-oriented silicon steel. The manufacturing method sequentially comprises the following: step I of adding molten steel into steel ladle, wherein carbon content of the molten steel is 0.02%-0.05%, oxygen content of the molten steel is 0.04%-0.08%, and temperature of the molten steel is not below 1590 DEG C; step II of opening the steel ladle to a slagging-off position of a ladle furnace to remove slag, wherein thickness of the slag is controlled to be smaller than 20mm; step III of slagging and heating the ladle furnace, wherein 3.8+ / -0.2Kg lime and 1.3+ / -0.2Kg fluorite are added into each ton of molten steel, and the ladle furnace is electrically heated to be not below 1630 DEG C; step IV of lifting the steel ladle into vacuum decarbonizing equipment for vacuum treatment, and extracting the vacuum degree to be below 1mbar after vacuumization is carried out for 3 minutes; step V of adding aluminum and silicon into the steel ladle, wherein 42+ / -4Kg ferrosilicon is added into each ton of molten steel, and 1+ / -0.2Kg lime and 0.67+ / -0.1Kg fluorite are added into each ton of molten steel to desulfurize 1% S; and step VI of circulating not less than 10min treatment after the lime and the fluorite are added. When the manufacturing method for the high-grade cold-rolled non-oriented silicon steel is adopted, content of carbon, sulfur and titanium in steel is reduced.

The invention discloses a treatment method of waste brine containing vanadium, chromium and titanium. During treatment, a ferric salt is firstly added into the wastewater, then vanadium, chromium, titanium and the like in the solution are precipitated by adjusting the pH value of the solution, and finally the wastewater is removed through filtration. According to the method, ferric salt is added into the waste brine, the content of vanadium, chromium and titanium in the wastewater can be remarkably reduced through precipitation reaction and flocculation, and the content of titanium, vanadium and chromium in the purified brine can be lower than 20 ppb, so that the purified brine can be used for ionic membrane caustic soda production, and the waste brine produced by production enterprises ofvanadium, titanium and the like is fully utilized; green environmental protection is achieved.

Titanium dioxide having a ratio Dtop / D50 of 1 to 3, between the maximum particle diameter Dtop and the average particle diameter D50, as determined based on observing the primary particles by a field emission-type scanning electron microscope. A production process of the titanium dioxide comprises performing a vapor phase process of reacting a titanium tetrachloride-containing gas with an oxidative gas to produce titanium dioxide, wherein when the titanium tetrachloride-containing gas and the oxidative gas are reacted by introducing each gas into a reaction tube, the temperature in the reaction tube is from 1,050 to less than 1,300° C.

The invention provides a method for smelting low-titanium steel by an electric furnace under the condition of a high melted iron ratio. The method comprises the sequentially-performed steps of (1), furnace burden condition and charging system determining; (2), melted iron pretreating; (3), electric furnace steelmaking process controlling; (4), steel tapping; (5), LF furnace refining; (6), VD furnace refining; and (7), casting. According to the method for smelting the low-titanium steel by the electric furnace under the condition of the high melted iron ratio, by analyzing the source of the titanium element in the steel, the amount of titanium brought in the steel is controlled in a targeted mode, and the low titanium content in the steel is realized by utilizing the titanium-oxygen reaction in the smelting process through appropriate increase in the slag quantity and other measures. The method for smelting the low-titanium steel by the electric furnace under the condition of the high melted iron ratio is suitable for production of all kinds of low-titanium steel, the proportion of melted iron is not lower than 60wt%, the mass percentage content of Ti in the molten steel at the electric furnace smelting end point is not larger than 0.0005%, and the titanium content in finished steel is not larger than 0.0015wt%.

The cosmetic of the present invention is a cosmetic containing at least titanium oxide having an average particle diameter of 0.2 μm or more and resin fine particles having an average particle diameter of 0.01 to 100 μm.The above cosmetic is reduced in a content of titanium oxide to decrease troubles brought about by settling thereof in various cosmetics to which whiteness and masking power are required and is endowed with the higher whiteness and the higher masking power in the solid content of the same degree as ever without affecting use feeling of the cosmetic.

The invention discloses a vacuum rotary table filter and a filtering process, and belongs to the technical field of titanium dioxide production, equipment advantages are utilized to monitor the content of residual titanium in filtered ferrous iron and the content of iron in titanium liquid, and the filtering feeding amount and the washing water flow are controlled through automatic interlocking, so that the filtering efficiency is improved. The quality fluctuation of the titanium liquid caused by manual regulation and control of water quantity is reduced, and the cost is reduced and the efficiency is improved; a three-washing process is adopted, so that the influence on the concentration of the titaniferous solution is reduced while ferrous separation is realized, and the dissolved amount of ferrous in the titaniferous solution is reduced; ferrous sulfate blocked in filter holes of the filter cloth is dredged by adopting a compressed air back flushing method, so that continuous and high-efficiency filtration is realized; by adding one or more scrapers and spray pipes matched with the scrapers, ferrous heptahydrate crystals are progressively washed, filtered and discharged one by one for multiple times in multiple layers, so that the filtering effect is improved, the content of titanium entrained in ferrous sulfate is reduced, the titanium yield is further improved, and the service life of filter cloth is prolonged.

A steel article is fabricated by providing an iron-base alloy having less than about 0.5 weight percent aluminum, melting the alloy to form a melt, adding calcium to the melt, thereafter adding aluminum to the melt to increase the aluminum content of the melt to more than about 0.5 weight percent aluminum, and casting the melt to form a casting. Other calcium additions may be made simultaneously with the adding of aluminum, and after the adding of aluminum but before casting the melt. The calcium additions deoxidize the melt to minimize the formation of clustered aluminum-oxygen-based inclusions.

The invention relates to a smelting method of bearing steel, in particular to a preparation method of the bearing steel with the low titanium content. The bearing steel comprises, by mass, no more than 0.0018% of Ti, more than 0.4% of Si (preferably, 0.4-0.6%), and more than 0.9% of C (preferably, 0.90-1.00%). The preparation method comprises the steps of primary smelting, fine smelting, vacuum degassing, pouring and rolling. According to the preparation method, the problem that the titanium content of a bearing steel product is too high is solved under the condition that the smelting cost isnot increased.

The invention discloses pre-melting slag for electroslag remelting titanium-containing steel and a method for preparing electroslag remelting low-oxygen titanium-containing steel through deoxidation. The pre-melting slag and the method aim at solving the problems that the titanium-aluminum ratio in an electroslag remelting ingot is reasonably controlled and the surface quality of the electroslag ingot and the cleanliness of the ingot are improved, and particularly the problems that titanium of the electroslag remelting titanium-containing steel is burnt out and the titanium is not uniform in the axial direction of the electroslag ingot. In order to guarantee the titanium-aluminum ratio of an electroslag remelting target steel grade in the prior art, titanium dioxide is added into the slag to form a CaF2-CaO-MgO-Al2O3-TiO2 slag system, and due to the fact that in the adding process of the titanium dioxide in the electroslag remelting slag stage, the powdery titanium dioxide is likely to volatilize and the titanium dioxide in the slag is not evenly mixed, Ti at the bottom of an electroslag ingot is not even. According to the pre-melting slag and the method, A + B titanium-containing pre-melted slag is designed, and the pre-melted slag of the group A and the group B are mixed and matched for use, the production requirements of high-temperature alloys with different titanium-aluminum ratios are met, the characteristic of the low melting point is achieved, and the surface quality of electroslag ingots is improved; and a deoxidizing agent is continuously added, and therefore the titanium is uniformly distributed in the axial direction of the electroslag ingot, and the cleanliness of the ingot is improved.

The invention relates to the technical field of metallurgy, in particular to a production method of aluminum-free bearing steel, which comprises the following specific steps of: (1) decarbonizing and dephosphorizing waste steel and desulfurized molten iron by a primary smelting furnace, keeping carbon, heating, and tapping; (2) in the tapping process, aluminum is not added for deoxidation, and a low-aluminum low-titanium alloy is added for deoxidation and alloying; (3) a sliding plate is used for stopping slag after tapping is finished; (4) 40 min before refining, the basicity of slag is controlled to be 1.5-2.0; (5) refining for 40 minutes, adding quartz sand to control the alkalinity of the slag to 1.0-1.3, and hoisting to an RH vacuum furnace for vacuum treatment after the temperature is controlled; (6) carrying out high-vacuum pressure maintaining, carrying out vacuum breaking, carrying out constant-oxygen soft blowing, and carrying out continuous casting; and (7) the molten steel is subjected to low-aluminum refractory protective casting to produce qualified continuous casting billets, the castability of the bearing steel is improved, and the yield of the bearing steel is increased.

The invention provides aluminum oxide for chemical mechanical polishing liquid and a preparation method of the aluminum oxide. Alpha-aluminum oxide particles in the polishing solution are obtained bypurification of kaolinite, wherein purity of aluminum oxide particles is greater than 99 wt%, the Moh's hardness is 9.1, the particle size is concentrated in a range of 0.5+ / -0.25 microns, and D97 isless than or equal to 1 micron. The preparation process is simple, raw material sources are wide, cost performance of products is high, and the preparation process can be widely applied to various industries and fields and can meet (chemical mechanical polishing) CMP polishing requirements.

The invention relates to a calcium-titanium composite material as well as a preparation method and application thereof. The calcium-titanium composite material with a titanium content of 0.5-5.5% is prepared through a one-step synthesis method. Compared with an existing calcium titanate photocatalyst material, the titanium content is obviously reduced, a high-temperature calcination treatment is not needed in the preparation process, the energy consumption is reduced, auxiliaries such as a guiding agent and a complexing agent do not need to be added in the preparation process, and the preparation cost is further reduced. The band gap energy of the prepared product can be effectively adjusted by the method, so that the controllability of the preparation process is improved.