121results about How to "Fast desulfurization" patented technology

The invention relates to a method for rapidly desulfurizing a slag washing and refining furnace for converter tapping, which belongs to the steelmaking technical field and is used to solve the problem that the converter tapping is rapidly refined and desulfurized. The method comprises two steps of steel ladles slag-washing and LF refining and is characterized in that pre-melted slag and white lime 3-5Kg/t are added according to the ratio of 7-12Kg/t in the step of the steel ladles slag-washing, the pre-melted slag is added according to the ratio of 3-5Kg/t in the step of LF refining, and fluxing medium is added according to the following ratio: lime 3-5Kg/t, calcium carbide 2-4Kg/t and ferrosilicon powder 2-4Kg/t, the components of the pre-melted slag is combined according to following weight units: CaO 46-52, Al2O3 38-45, CaF2 5-7, SiO2<=10, Fe2O3 <=2, H2O<= 0.5, and the pre-melted slag melting point <=1350DEG C. The invention can increase the rear furnace slug washing of a high converter under the condition that aluminum is added to deoxidize in refining and refining slag is rapidly produced under the weak oxidation condition, and the requirements for producing low sulphur steel are satisfied.

The invention discloses a rapid desulfurization refining method for a ladle furnace (LF). The method comprises the following steps of: 1) performing desulfurization refining in the LF, wherein the LF treatment starting temperature is between 1,570 and 1,605 DEG C; 2) after a ladle argon blowing device of the LF is turned on, blowing argon from the bottom of the ladle; 3) after finishing adjusting the temperature, inserting a desulfurization powder spraying gun into a molten steel liquid for spraying a desulfurizing agent; 4) after finishing spraying powder, switching the spraying gun to a functional stage of blowing the argon, blowing the argon from the top, simultaneously blowing the argon from the bottom of the ladle, and performing strong stirring desulfurization operation; 5) alloying, namely after desulfurization is finished, lifting the desulfurization powder spraying gun, adjusting a ladle bottom blowing flow, and performing alloy configuration to meet a target requirement on final components of a steel grade; and 6) after finishing adjusting components, performing soft stirring operation, measuring the temperature, sampling, and turning off the ladle argon blowing device to finish treating. The method realizes rapid desulfurization of the LF, and can shorten an overall melting cycle and improve the number of continuous casting furnaces and production efficiency.

The invention provides a method for realizing deep depletion on copper slag through multielement gas substep injection. The method fully utilizes waste heat of molten copper slag, copper matte is converted into oxide through gasification desulphurization, then selective reduction is carried out to obtain copper iron alloy with higher copper content, the problem of copper slag depletion in a smelting process is solved, and low-sulfur low-copper depletion slag is produced, so that conditions are created for a follow-up iron extracting process, and the deep depletion on the copper slag is realized; the traditional matte-producing depletion process is abandoned, but a gasification desulphurization process is firstly carried out for converting the copper matte into the oxide, then the oxide is subjected to selective reduction by virtue of a reducing agent, so that a copper-iron alloy phase is obtained. Operation is simple, adaptability is strong, the method can be realized by modifying the original electric furnace, nickel slag similar to the copper slag in properties can be treated, and metal elements such as Cu, Ni, Co and Fe can be comprehensively recycled.

The invention discloses a method for controlling carbon and deep desulphurization by a refined-smelting ladle furnace in the production of extreme low carbon steel, pertaining to the technical field of ladle refining. The technology of the invention is that the amount of roughing slag of a converter is controlled and the thickness of the slag is 30 mm to 60mm; the temperature of molten steel in an LF furnace ranges from 1590 DEG C to 1640 DEG C and the content of Al in the steel is equal to 0.05 percent to 0.09 percent; 6 to 12 kg/ton of refining slag with high basicity and 0.4 to 1.0 kg/ton of Al granules are added; the flow of bottom-blowing argon gas is controlled during the rapid deep desulphurization refining process. On the condition that no electrode is available, argon gas with mass flow of 6 to 8NL/ (min question mark t) is adopted for melting slag. After slag melting, the electrode is arranged to control the flow of argon gas to 4.8-6NL/ (min question mark t) and carbon pickup of the molten steel occurs; when the refining is completed, the oxidizability of steel slag (FeO+MnO) is required to be less than or equal to 1.0 percent and the weight percentage of alkalinity of (CaO)/(SiO2) is equal to 5.5 to 8.0. The method of the invention has the advantages of solving the problem of carbon pickup during the refining in the LF furnace and controlling the weight percentage of carbon increment within 0.015 percent, thereby realizing rapid deep desulphurization with the content of sulfur[S] which is less than or equal to 0.0010 percent after desulphurization, and shortening the smelting time of the LF furnace.

The invention relates to a method for activating high-sulfur bauxite by means of a low-temperature roasting desulfurization method. The method which carries out oxidative desulfurization roasting on bauxite with 1 to 5 wt percent of sulfur content so that the bauxite can become material applicable to the Bayer process production of alumina is characterized in that the oxidative desulfurization temperature is controlled between 500 DEG C and 600 DEG C. More specifically, in a fluidized bed roaster or a rotary kiln, hot air which is 650 DEG C to 900 DEG C is utilized to heat dry-ground mineral powder. Not only is the sulfur content in the processed mineral powder decreased to be less than 0.5 percent, but also the organic matters in the mineral are completely oxidized to be decomposed, and meanwhile, because the roasting temperature is low, activated alumina can be prevented from being transformed to become over-stable. When the roasted bauxite is used in Bayer digestion, the digestion performance is improved, and the digestion rate of alumina is higher than 93 percent. After limestone suspension is cyclically sprayed or red mud suspension is sprayed to desulfurize the tail gas containing SO2 produced by oxidative desulfurization, the SO2 content can be decreased to be less than 300mg/m3, and thereby the tail gas comes up to the emission standard.

The invention discloses high-efficiency deep desulfurization active carbon and a preparation method thereof, belonging to the field of modified active carbon materials. The high-efficiency deep desulfurization active carbon is prepared through the steps of by adopting coal or a coconut shell as raw materials, crushing, screening, then adding a coal tar adhesive for extrusion forming, and calcining at 750-950 DEG C to form primary active carbon; carrying out dipping treatment on the primary active carbon, uniformly loading a hydroxide active agent and a cyclodextrin assistant active agent, carrying out secondary high-temperature calcination in the presence of excessive heat water vapors to obtain a high-efficiency desulfurization active carbon product. The active carbon prepared through the method disclosed by the invention has the advantages of high sulphur capacity, high desulfurization speed, long usage period, high strength, good abrasion resistance, good material permeability, no dust and the like, can not only be used for the large-scale deep desulfurization and purification of petrochemical products such as fuel oil, natural gas, gas, liquid hydrocarbon and synthetic ammonia, but also be used for the fields of pharmaceutical gas sterilization, solution filtration and purification, solvent recovery, water purification, gas purification and the like.

The invention provides a method for producing an ultralow-sulfur steel under high vacuum, the sulfur content of steel discharged by a converter can be controlled below 0.010%; during the LF furnace refine treatment process, the sulfur content can be controlled at 0.005-0.007%, the slag alkalinity in the later stage can be controlled between 2.0-4.5, thereby a CaO-MgO-Al2O3-CaF slag system is formed, the total slag amount can be controlled at 8.5-10kg/ton steel, the argon flow during the whole process is 150-250N1/min; and a VD furnace high vacuum treatment is carried out by using argon with a flow of 450-550N1/min for mixing. Thereby the molten slag equivalent of slag can be enhanced, great flip of a molten steel surface can be avoided, the addition of the molten steel nitrogen absorption and impurities can be minimized, rapid operation during desulphurization process can be promoted, the sulfur content of the finished product can be controlled below 0.005%, and nitrogen content of the finished product can be controlled below 25ppm, and the qualified rate of ultralow-sulfur steel production can be increased.

An alkaline modified activated carbon desulfurizer is prepared from the following raw materials by weight: 100-120 parts of activated carbon, 4-5 parts of sodium hydroxide, 30-34 parts of diatomite, 3-4 parts of glass powder, 4-5 parts of silicon dioxide, 8-10 parts of modified attapulgite, and a proper amount of water. According to the invention, with the use of sodium hydroxide, the desulfurization speed is high, and the efficiency is high; diatomite is added as a carrier, which provides good adsorbing effect; with the desulfurizer of the invention, no harmful substance is generated after desulfurization, which is more environment-friendly and safer; the desulfurizer of the invention is easy to regenerate, and the preparation method of the invention is simple in process, suitable for industrial production, and cost-saving.

The invention discloses a rapid desulfurizing method for smelting ultrapure steel with a vacuum induction furnace, which comprises the following steps of: calculating the weights of a needed steel scrap raw material, various alloys, carbon granules used as an deoxidizing agent and rare earth wires used as a desulfurizing agent according to the component requirement of steel, and weighing the raw materials; then closing a vacuum chamber, and vacuumizing for 3-8 minutes until the vacuum degree of the vacuum chamber reaches 0.05-0.1 Pa; carrying out power transmission on the vacuum induction furnace for melting steel, and adding the carbon granules in a chute to molten steel by batches during the steel melting process; maintaining the vacuum degree of the vacuum chamber at 0.05-0.1 Pa after steel melting, and continuing vacuumizing for 15-20 minutes; stopping vacuumizing, and introducing argon gas to the vacuum chamber until the pressure in the vacuum chamber reaches 500-700 Pa; adding the various alloys to the molten steel for alloying treatment; adding the desulfurizing agent to the molten steel, stirring, oscillating and standing; and pouring to an ingot mold in a vacuum environment while retaining 2-10% of molten steel. Practice proves that the desulfurizing method provided by the invention employs a precipitation method to desulfurize without slag addition or slag generation, generated desulfurized products are removed through precipitation, rapid desulfurization can be realized, the operation is simple and feasible and the cost is low.

A vermiculite modified activated carbon desulfurization agent is prepared from the following raw materials: by weight, 100-120 parts of activated carbon, 4-5 parts of oleic acid, 13-16 parts of ethylene glycol, 20-30 parts of vermiculite, 10-15 parts of black manganese ore, 4-5 parts of stearic acid, 4-5 parts of zinc oxide, 8-10 parts of modified attapulgite and a proper amount of water. The vermiculite modified activated carbon desulfurization agent has an enhanced adsorption performance and can absorb various harmful substances due to use of the vermiculite; the black manganese ore and the zinc oxide are also added, so that the vermiculite modified activated carbon desulfurization agent can quickly desulphurize and can be recycled, and the vermiculite modified activated carbon desulfurization agent is low in raw material cost, simple in technology and suitable for industrialized production, produces no toxic substances, and is suitable for household, industry, automobile tail gas desulfurization.

The invention provides an ammonium sulphate-limestone method for desulphurization of flue gas, and specifically provides a wet desulphurization method using limestone as a raw material and ammonium sulfate as a process absorbent. The method is as below: 5-40 wt% of ammonium sulfate is used as the process absorbent, and limestone (calcium carbonate) is used as an absorbent; flue gas enters an absorbing tower from a middle part of the absorbing tower, countercurrent contacts with an absorption liquid for mass transfer and leaves from top of the tower; slurry at tower bottom circulates in the absorbing tower; part of the slurry is sent to desulfurized slag dehydration technology water recovery system. The invention has the beneficial effects that the absorbing tower desulphurization speed is accelerated, so that a same tower can process more flue gas; the absorbing tower has large operating elasticity and stable operation with low energy consumption; partial denitration can be realized while desulphurization; desulfurized slag post-treatment operations reserve larger integral utilization space and comprise a calcining operation for recovering sulfur dioxide.

The invention provides a reclaimed rubber softening agent. The reclaimed rubber softening agent is obtained by reacting a softening agent main material with a softening agent auxiliary in the presence of a catalyst; the softening agent main material comprises a natural vegetable oil ingredient, while the softening agent auxiliary comprises a natural biochemical oil ingredient, and the catalyst is a phthalate; the natural vegetable oil ingredient is a natural vegetable oil and/or natural vegetable oil foots; the natural biochemical oil ingredient is a natural biochemical oil and/or natural biochemical oil foots. The reclaimed rubber softening agent is a composite product prepared by compounding the natural vegetable oil and the biochemical oil and refining the mixed oil under the catalytic action of phthalate. The softening agent passes the PONY test of the international authoritative detection mechanism, meets the requirements of the European Union REACH environmental protection laws and regulations and passes the authentication of China Quality Certification.

The invention relates to a dolomite matrix desulfurizer based on in-situ reduction and a method for preparing the same. The invention is characterized in that: the dolomite matrix desulfurizer consists of dolime, reducer, self-propagating exothermic agent, reaction promoter and fluorite; the dolime, the reducer, aluminum powders, ferrous iron oxide powders or ferric oxide powders, the reaction promoter and the fluorite are respectively dried for 4 to 20 hours at a temperature of between 120 and 200 DEG C, mixed, grinded by a ball grinding machine till the granularity is less than 200 meshes, then made into particles in a spherical shape or other shapes by a sampling machine at a pressure of between 20 and 50 MPa, thereby preparing the dolomite matrix desulfurizer. The dolomite matrix desulfurizer is adopted for desulphurization reaction, has the advantages of low desulphurization cost, high utilization rate of desulfurizer, high desulphurization rate, no obvious temperature reduction in the desulphurization process, no need of specialized desulphurization equipment, simple operation, etc. and has the desulphurization rate of over 85 percent.

The invention discloses a rail steel refining method. The rail steel refining method includes the steps that in the converter steel tapping process, active lime is adopted for conducting slag washing, and then calcium carbide is adopted for modifying ladle top slag; a modified steel ladle is sent to an LF for conducting slag adjusting, the active lime and the calcium carbide are adopted for refining, adding is carried our two times in the adding process, and the argon flow meets the conditions that the argon flow at the earlier stage ranges from 100 Nl/min to 200 Nl/min, the argon flow at the medium stage ranges from 100 Nl/min to 200 Nl/min, and the argon flow at the later stage ranges from 100 Nl/min to 150 Nl/min. The sulphur content in molten steel obtained after LF processing is smaller than or equal to 0.006%, silica sand is added at the later LF processing stage for reducing the alkalinity of the steel ladle slag, then refining is continuously carried out for an appropriate time, and the steel ladle slag is sent for conducting vacuum processing. The rail steel refining method is suitable for producing high-quality rail steel, and the sulphur content in the steel is smaller than or equal to 0.006%.

The invention provides a smelting method of low-sulfur and low-boron steel. The steel comprises, by weight, 0.05%-0.18% of C, 0.10%-0.35% of Si, 1.10%-1.60% of Mn, no more than 0.020% of P, no more than 0.003% of S, 0.010%-0.050% of Nb, 0.008%-0.025% of Ti, no more than 0.30% of Ni, no more than 0.20% of Mo, no more than 0.25% of Cr, no more than 0.0005% of B, and 0.010%-0.050% of Als. The smelting process includes a converter, an LF furnace, an RH furnace and CC. Pretreatment for desulfuration is not needed, the carbon content of steel discharged out of the converter is slightly decreased toreduce molten steel w[B], low-B alloys such as manganese metal and mid-carbon ferromanganese are added, liquid cast waste slag is used, and the quantity of recovered liquid cast slag is controlled, sothat rapid slagging and desulfuration are guaranteed, and the quantity of B dragged into slag is reduced; the LF furnace only adopts aluminum wire deoxidation, and a large quantity of argon is blownfrom the bottom to achieve stirring, so that the probability that boric oxide in the slag is reduced and molten steel enters the slag is lowered while the sulfur content in the molten steel is decreased; and when the sulfur content in the molten steel reaches a required sulfur content, the argon blown from the bottom is regulated to be weak, stirring is conducted to reduce the quantity of added B,and an obtained finished products meets w[S]<=0.003 and w[B]<=0.0005.

The present invention provides a desulfurizing smelting method for ultra low sulfur pure iron, and the method comprises the following steps: smelting a raw material in an electric furnace, and controlling complete deslagging is performed after Si content reaches 0-0.50% and P content reaches 0-0.005% in an oxygen melting period step; after the deslagging is complete, tapping in the manner of eccentric bottom tapping, and adding an aluminum ingot into a steel ladle along a steel flow according to the dosage of 3.0-4.5kg / t; performing LF smelting, in the LF refining process, using a CaO + CaF2 + Al2O3 slag system for desulfurization; and casting after composition and temperature of molten steel meet requirements. Aluminum as a desulfurizing agent and the CaO + CaF2 + Al2O3 slag system as a refining slag system are used for the desulfurization, and special safety and protective measures are not needed in processing, transportation, storage and use processes.

The invention relates to a device and method for active carbon flue gas desulphurization and production of dilute sulphuric acid, and the device is characterized by including a device casing, a foam collecting device located at the upper part of the device casing, an active carbon absorption and elution device located at the middle of the device casing, and a flue gas inlet pipe located at the lower part of the device casing. Spherical active carbon is used as a desulfurization agent, flue gas flows in from the bottom of a the tower, the active carbon is in the fluidized state, spray liquid (dilute sulfuric acid or clear water) and the spherical active carbon are contacted, active carbon desulfurization product sulfuric acid is taken away, and active carbon surface activity is recovered, so that active carbon regeneration rate is also greatly accelerated so as to achieve the continuous operation of flue gas desulfurization. Single column continuous operation is feasible, active carbon filling amount is small, occupation area is small, primary investment is less, and the failure rate is low.

The invention discloses an efficient atomization desulfurization device, which comprises a lime powder feeding and storage system, a lime slurry preparation system, a lime slurry transfer system, a lime slurry storage system, a lime slurry injection system, a desulfurization catalyst storage system and a desulfurization catalyst injection system system; the outlet of the lime powder feeding and storage system is connected to the inlet of the lime slurry preparation system; the outlet of the lime slurry preparation system is connected to the inlet of the lime slurry storage system through the lime slurry transfer system; The outlet of the lime slurry storage system is connected to the inlet of the lime slurry injection system through the lime slurry transfer system; the outlet of the desulfurization catalyst storage system is connected to the inlet of the desulfurization catalyst injection system. In addition, the invention also discloses a high-efficiency atomization desulfurization method. The invention has the advantages of simple structure, low investment, low cost, low energy consumption, desulfurization efficiency as high as 95% or more; almost all SO3 is removed.

A preparation method and application of a Ti/MCM-41 molecular sieve with catalytic oxidation activity. The invention designs a preparation method and application of a Ti/MCM-41 molecular sieve. The invention aims to solve the problem of low catalytic oxidation desulfurization efficiency of the Ti/MCM-41 molecular sieve prepared by the existing method. Method: 1. Put MCM-41 molecular sieve in a muffle furnace for pretreatment; 2. Disperse organic titanium source evenly in ethanol, then add MCM-41 molecular sieve, perform ultrasonic treatment, then age at room temperature, and then put Stir in an oil bath until water and ethanol are completely volatilized, and finally dry to obtain a white solid; 3. Put the white solid obtained in step 2 in a muffle furnace for calcination to obtain Ti/MCM-41 molecular sieve. The Ti/MCM-41 molecular sieve of the present invention has an excellent catalytic oxidation desulfurization reaction effect at room temperature, and the conversion rate of dibenzothiophene reaches over 97% after the reaction at room temperature for ten minutes.

The invention relates to a catalyst for oxidation sweetening of diesel oil and an application thereof. The catalyst has the expression as QrBmHn[AxMyOz](r+m+n)-; in the expression, Q represents quaternary ammonium salt cations and is constituted by R1R2R3R4N+, R1, R2, R3 and R4 represent saturated alkyls of C1-C20 in which at least one carbon chain length is larger than or equal to 4 carbon atoms; B represents metal cations; H represents hydrogen atoms; A represents one of B, P, As, Si and Al elements; M represents the metal elements W and Mo; and O represents oxygen atoms, wherein r+m+n is equal to or less than 14, r is equal to or less than 10 and equal to or larger than 1, m is equal to or larger than 0 and equal to or less than 3, n is equal to or larger than 0 and equal to or less than 3, x is equal to 1 or 2, y is equal to or larger than 0 and equal to or less than 18, and z is equal to or larger than 34 and equal to or less than 62.The catalyst used for preparing low sulphur diesel mainly comprises the following steps: mixing the catalyst QrBmHn[AxMyOz] (r+m+n), aqueous hydrogen peroxide solution and diesel oil, reacting for 10min-5h under the temperature of 30-60 DEG C, standing or centrifugalizing to recovery the catalyst and obtain the oxidized diesel oil, and removing sulphone and/or sulphone sulfocompound from the oxidized diesel oil by an extracting or distilling method to obtain the low sulphur diesel of the sulphur content is less than 10ppm.

The invention relates to a preparation method and an application method of poly (tetramethylguandium acrylate) desulfurization agent. The poly (tetramethylguandium acrylate) desulfurization agent can be used for flue gas desulfurization of a thermal power plant and a metallurgic plant, and has excellent selective absorption for sulfur dioxide as well as good lasting absorption property and multi-time cycle absorption and desorption stability. The desulfurization agent is characterized by comprising the components: poly (tetramethylguandium acrylate), water, antioxidant, corrosion inhibitor and defoaming agent. The preparation method comprises the steps of: adding solvent into a polymerizing pot, then adding initiator into the solvent, slowly heating to 120-140 DEG C when stirring, and dripping acrylic acid within 2-4h at the temperature of 120-140 DEG C; then removing the solvent under pressure reduction, and grinding to obtain polyacrylic acid; adding polyacrylic acid and water into a reaction flask and stirring; controlling the temperature to be 0-5 DEG C by ice-water bath, dripping 1,1,3,3-tetramethyl guanidine, reacting for 1h and then stopping the reaction; and adding right amount of antioxidant, corrosion inhibitor and defoaming agent, and evenly stirring to obtain poly (tetramethylguandium acrylate) aqueous solution, wherein the aqueous solution is the target desulfurization agent product.