68results about How to "Reduce manganese content" patented technology

The invention discloses an Ausferrite ductile cast iron grinding ball, and relates to a spherulitic graphite-contained cast iron alloy. The Ausferrite ductile cast iron grinding ball comprises the following chemical elements in percentage by mass: 3.3-3.7% of C, 2.0-3.0% of Si, 1.0-2.5% of Mn, 0.7-3.0% of Cr, 0.1-1.0% of Mo, 0.1-1.0% of Cu, 0.04-0.08% of P, 0.01-0.020% of S, 0.03-0.05% of Mg, 0.02-0.04% of Ce, 0.03-0.07% of B, 0.06-0.12% of Ti, 0.03-0.2% of V, and the balance of Fe. The Ausferrite ductile cast iron grinding ball is prepared by the steps of preparation and smelting of raw materials, spheroidizing treatment, inoculation treatment and microalloying treatment, and isothermal quenching heat treatment. The Ausferrite ductile cast iron grinding ball overcomes the defects of low production efficiency and high consumption of electric energy of a ball mill due to easy surface stripping and crushing and shorter fatigue life of an existing grinding ball product in the service process.

A method in connection with the production of mechanical pulp from a cellulose containing material wherein the material is processed in at least one refining step to produce pulp. According to the invention, the pulp is fractionated (4), after a first refining step (1), in order to separate primary fines (5) from the pulp. The invention also relates to a mechanical pulp, produced by the method, and to a paperboard, which at least partly consists of such mechanical pulp.

The invention provides a chromium-alloyed cord steel wire rod and a production process. The chromium-alloyed cord steel wire rod comprises the following chemical components of, in percentage by weight, 0.68%-0.82% of C, 0.20%-0.40% of Mn, 0.15%-0.30% of Si, 0.30%-0.40% of Cr, less than or equal to 0.012% P, less than or equal to 0.008% of S, less than or equal to 0.05% of Ni, less than or equal to0.05% of Cu, less than or equal to 0.03% of Mo, less than or equal to 0.003% of Al, less than or equal to 0.002% of Ti, less than or equal to 0.002% of [O], less than or equal to 0.005% of [N], and the balance Fe and unavoidable impurities. The production technology comprises the following steps of smelting molten steel, and adding chromium alloy in the converter tapping process; refining to obtain molten steel; carrying out continuous casting on the molten steel obtained after refining to obtain a steel billet; and heating the steel billet to obtain a chromium-alloyed cord steel wire rod, and carrying out controlled cooling on the chromium-alloyed cord steel wire rod. According to the chromium-alloyed cord steel wire rod and the production process, microalloying is adopted, the chromiumcontent is increased, the carbon content and the manganese content are reduced to compensate for the performance of the steel wire rod and the finished steel wire, carbon segregation of the steel wirerod is improved, the net carbon forming probability is reduced, the plasticity and the machining performance of the steel wire rod can be improved at the same time, and the strand combining and wirebreaking rate in the steel wire rod cord machining process is reduced.

The invention discloses a method for producing low-manganese steel. Desulphurized molten iron is added into a first converter, 1/2-3/4 of total lime is added within 3 min after smelting starts, the left lime is added within 5 min, the lance position is 2.2-2.4 m within the first 4 min, the oxygen flow amount is 198-202 m<3>/h.t steel, and the oxygen pressure is 0.75-0.85 MPa. The tapping temperature of the first half steel is 1420-1440 DEG C, and half steel carbon is 2.8-3.2%. Slag tapping is controlled after tapping of the first half steel, and the slag thickness is smaller than 80 mm. The last half steel is subjected to blowing normally according to the internal control requirements of the converter, boiling steel tapping is conducted in a slag pushing-off mode, the slag thickness is smaller than 80 mm, and 2.5-3.5 kg/t steel of jarred lime is added during steel tapping. The last half steel is moved to an LF workstation after being hung on a jar to be subjected to heating and slagging, bottom blowing is conducted in the whole process, the bottom blowing argon flow amount is 80-100 m<3>/h, slagging lime is added in two or three times, and the total amount is 8-10 kg/t steel. The stirring time is not shorter than 25 min, and then slagging-off treatment is conducted. 1-3 kg/t steel of lime is added after slagging-off. According to the method, the final manganese content in the steel can be stably controlled to be smaller than 0.025%. The process is easy to operate, convenient and feasible.

The invention discloses a method for utilizing high-manganese molten iron to smelt ultra-low-manganese steel and belongs to the field of steel and iron metallurgy. The method for utilizing the high-manganese molten iron to smelt the ultra-low-manganese steel comprises the steps that in the converter process, the double-slag smelting technology is adopted for removing elements like manganese in most molten iron, the technology of converter low-temperature tapping and LF refining furnace deep manganese removing is adopted for further removing the manganese, on the condition that the molten ironentering the furnace is high-manganese molten iron with the manganese content higher than 0.40%, the manganese content in the molten iron is stably controlled below 0.02%, and the smelting requirementof the ultra-low manganese steel is met.

The invention belongs to the field of ferrous metallurgy materials, in particular relates to a substrate for a strapping band and a production method thereof. The substrate comprises the following chemical components in percentage by weight: 0.14-0.20 percent of C, 0.17-0.37 percent of Si, 0.55-0.75 percent of Mn, less than or equal to not more than 0.035 percent of P,0.01-0.04 percent of AL and the balance of Fe and inevitable impurities, wherein the tensile strength is not less than 7850Mpa, the elongation percentage is not less than 8 percent and the repeated bending times is not less than 8. In the production method, the smelting steps comprises the specific steps of molten iron pretreatment sulfur removal station, top and bottom combined blown converter, LF (Low Frequency) steel ladle refining and slab continuous casting,; the hot rolling steps comprises the specific steps of heating, rough rolling, hot rolling, finish rolling, laminar cooling and reeling; and the cold rolling steps comprises the specific steps of acid pickling, cold rolling and heat treatment. The steel grade has reasonable mixture ratio of chemical components and higher product strength, elongation percentage and repeated bending times compared with national standard. The production method of the substrate can ensure the chemical organization and physical performance of the steel grade.

The invention relates to a production process for extracting the manganese element by utilizing electrolytic manganese waste residues and a production process for extracting the manganese element by utilizing low-quality manganese ore, in particular to a method for extracting manganese from the electrolytic manganese waste residues or the low-quality manganese ore by utilizing a mechanochemical method and an auxiliary agent thereof. The method comprises the following steps of: adding the auxiliary agent with the weight percentage being 2.0-11.0% in the claim 1 or 2 in the electrolytic manganese waste residues or the low-quality manganese ore, fully and uniformly mixing, crushing till the diameter D 50 is 2-6mum, then carrying out heat extraction by using sulfuric acid with the weight 5-10 times that of the auxiliary agent for 2-4 times, and filtering to separate leaching liquor for producing the electrolytic manganese. The method has the advantages that the auxiliary agent is added in the treatment process of the electrolytic manganese waste residues or the low-quality manganese ore, and is crushed together with the electrolytic manganese waste residues or the low-quality manganese ore so as to generate certain-level action, then the heat extraction is carried out by using the sulfuric acid, and after solid-liquid separation, the content of the manganese in the waste residues is reduced to about 0.1%, or even lower.

A drier for oxidative polymerization-drying printing ink is provided, which does not contain cobalt capable of exerting an adverse influence on the environment and health and which is environmentally friendly. A printing ink containing the drier is also provided. The drier for oxidative polymerization-drying printing ink contains a cerium salt of a fatty acid and a manganese salt of a fatty acid.

The invention relates to the technical field of steel rolling in the steel metallurgy technology and relates to a method for improving the production efficiency of Q345B hot rolled narrow strip steel.The method includes the following steps that firstly, molten iron pretreatment is conducted; secondly, converter smelting is conducted, wherein the converter steel putting time is not shorter than 2min, when molten steel is discharged by one fifth, calcium silicon, silicon carbide, silicomanganese, vanadium nitrogen and ferroniobium are added in a batched manner for deoxygenation alloying, a carburant is added for increasing carbon, and adding is completed when molten iron is discharged by three fourths; the temperature of a steel ladle is larger than or equal to 700 DEG C, 3 kg/t to 6 kg/tof modification agents are added to the steel ladle bottom before tapping, and then online baking of the steel ladle is conducted; thirdly, bottom argon blowing stirring is conducted in the whole process, argon blowing is conducted for 13 min to 15 min totally, the argon flow is controlled to be 200 L/min to 300 L/min in 10 min before argon blowing, and the argon flow is controlled to be 50 L/minto 80 L/min before departing; fourthly, continuous casting is conducted, protective casting is conducted in the whole process, the superheat degree of tundish molten steel is controlled to range from20 DEG C to 30 DEG C; and fifthly, hot rolling is conducted. By means of the method, an alloy replacing method is used for reducing the adding amount of alloy materials, the converter tapping temperature can be reduced, and therefore the purpose of improving the production efficiency and capacity is achieved.

The invention provides a manufacturing method of a high manganese high nitrogen low nickel non-magnetic stainless steel and a product thereof. The stainless steel is single phase austenite stainless steel which comprises the following chemical components in percentages by mass: greater than 0 but less than or equal to 0.1% of C, less than or equal to 0.01% of S, less than or equal to 0.015% of P, greater than 0 but less than or equal to 1.0% of Si, greater than or equal to 16% but less than or equal to 18% of Mn, greater than 0 but less than or equal to 2% of Ni, greater than or equal to 10% but less than or equal to 14% of Cr, greater than or equal to 1% but less than or equal to 2% of N, greater than or equal to 0.3% but less than or equal to 1% of Cu, greater than or equal to 0.3% but less than or equal to 5% of Mo, greater than or equal to 0.3% but less than or equal to 1% of Nb and the balance of Fe. The manufacturing method comprises the following steps: heating and smelting raw materials, and performing decarbonization, desulfuration and deoxygenation; raising the temperature to 1600 DEG C and adding nickel; adjusting the temperature of a bath to 1550 DEG C, and adding ferromolybdenum, ferrocolumbium and a metal copper; adding a desoxidant for secondary deoxidization, introducing nitrogen, adjusting the temperature of the bath to 1610-1620 DEG C, and adding nitrogen containing ferrochromium; adjusting the temperature of the bath to 1150-1250 DEG C, introducing nitrogen, adding nitrided ferromanganese, pouring, quenching and air cooling, and machining to form a panel, heating the panel to 650-700 DEG C, keeping the temperature for 30min, and performing furnace cooling to room temperature. The stainless steel through deep punching is still non-magnetic, and needs not to be annealed and demagnetized. The manufacturing method is high in nitrogen-increasing efficiency and low in loss of equipment.

The invention discloses a preparation method of high-strength 550L automobile beam steel, which comprises the steps of enabling beam steel to comprise the following components: 0.080-0.11 wt% of C, less than or equal to 0.20 wt% of Si, 0.55-0.65 wt% of Mn, less than or equal to 0.018 wt% of P, less than or equal to 0.004 wt% of S, 0.045-0.060 wt% of Ti, 0.020-0.035 wt% of Al, 0.0030-0.0045 wt% of N and less than or equal to 0.0020 wt% of steel TO; performing converter smelting tapping control, wherein [C] is 0.06-0.08%, [P] is less than or equal to 0.015%, [S] is less than or equal to 0.008% and [O] is less than or equal to 400PPm, during converter tapping, fluorite, calcium carbide and active lime are mixed according to a mass ratio of 1:1:3, and are added in three times according to the interval of 1 minute, 2 minutes and 3 minutes in the converter tapping process, and the adding target value is 600 kg per converter; performing oxygen determination before LF refining treatment; and performing continuous casting, wherein continuous casting molten steel is cast under the protection of argon, the heating temperature of a plate blank is 1210-1230 DEG C, a hot-rolled coil with the thickness of 3.0-10 mm is obtained by adopting a hot continuous rolling mill through rolling, and the finish rolling temperature is 854-858 DEG C.

The invention discloses a method for safely planting crops on manganese contaminated soil. The method comprises the following steps that straw is soaked in an alkaline solution for 1-2 days and subjected to pyrolysis for 1-2 hours at the temperature of 200-600 DEG C under the low-oxygen or anoxic condition after being taken out of the alkaline solution, pyrolysis cooling and smashing are conducted in sequence, and improved straw charcoal is obtained. The improved straw charcoal is applied to the manganese contaminated soil, and radix phytolaccae is planted dispersedly. The next year the radix phytolaccae grows, the crops are interplanted between the plants of the radix phytolaccae. The method for safely planting the crops on the manganese contaminated soil is provided by adopting the mode of applying the improved straw charcoal, planting the manganese hyperaccumulator radix phytolaccae and then interplanting other crops, so that safety production is achieved while the manganese contaminated soil is remedied, and the high soil utility value is obtained.

The invention belongs to the field of metal materials, and relates to non-quenched and tempered steel containing Ti and N and applied to an automobile engine crankshaft. The non-quenched and temperedsteel comprises chemical components in percentage by mass as follows: 0.44%-0.48% of C, 0.25%-0.45% of Si, 0.82%-0.92% of Mn, 0.12%-0.21% of Cr, 0.07%-0.10% of V, 0.02%-0.03% of Ti, 0.010%-0.020% of N, smaller than or equal to 0.025% of P, 0.040%-0.060% of S and the balance of Fe and normal impurities. The microscopic structure of a large rolled bar (with diameter being 110 mm) containing the components is pearlite+ferrite, and the structure of the large rolled bar is thinner and has good uniformity; austenite grain size in the position of 1/2 radius of the large rolled bar can reach level 8.0, and core-surface grain size range can be as low as level 0.5. The crankshaft is made of the large rolled bar as a raw material through die forging, and the microscopic structure of the crankshaft ispearlite+grain boundary ferrite+intragranular ferrite; yield strength in the position of 1/2 radius of a main journal of the crankshaft can reach 500 MPa or higher, tensile strength can reach 800 MPaor higher, and room-temperature impact energy KU2 can reach 20 J or higher; hardness of a cross section of an output end of the crankshaft is 240-260 HB, which is suitable for drilling operation, andmachining cost can be reduced. Therefore, requirements for structure uniformity of the large rolled bar and comprehensive mechanical properties of the crankshaft can be met.

The invention discloses manganese doped inorganic halogen perovskite quantum dots and a preparation method thereof. The preparation method comprises the following steps: lead salt and manganese chloride are dissolved and heated at 80-110 DEG C, and a halogen precursor is obtained; cesium salt is dissolved, and a cesium precursor is obtained; the cesium precursor is added to the halogen precursor,the mixture is heated at 80-110 DEG C, and the manganese doped inorganic halogen perovskite quantum dots are obtained. The method for preparing the manganese doped inorganic halogen perovskite quantumdots with high yield at lower temperature needs no inert gas protection, preparation cost is reduced, preparation efficiency is improved, quantum yield is as high as 62.41% which is 12.41% higher than the current highest quantum yield of 54% with a hot injection method, and the method can be applied to mass production.

The invention discloses improved corrosion-resistant superaustenitic stainless steel and a preparation method thereof. The stainless steel comprises the following components of, by weight, 0.01 wt%-0.02 wt% of carbon, 0.4 wt%-0.6 wt% of silicon, 0 wt%-0.2 wt% of manganese, 0 wt%-0.02 wt% of phosphorus, 0 wt% to 0.01 wt% of sulfur, 21 wt%-22 wt% of chromium, 24 wt%-25.5 wt% of nickel, 6.0 wt%-7.0 wt% of molybdenum, 1 wt%-3 wt% of vanadium, 0 wt%-3 wt% of niobium, 0.20 wt%-0.25 wt% of nitrogen, 0 wt%-0.1 wt% of rare earth elements and the balance iron. The improved corrosion-resistant superaustenitic stainless steel does not add manganese or has a low manganese element content, is high in nitrogen content, good in normal-temperature resistance and high-temperature corrosion resistance, highin strength and excellent in comprehensive performance.

The invention relates to a high-hardness alloyed nodular iron die material which comprises, by weight, 3.4-3.9% of C, 2.0-2.5% of Si, 0.2-0.4% of Mn, less then 0.02% of P, less then 0.02% of S, 0.4-0.6% of Cr, 0.7-1.0% of Cu, 0.4-0.6% of Mo, 0.6-1.0% of Ni, and the balance Fe. The preparation method includes the following steps of proportioning a material according to the above chemical components, placing the material to an intermediate frequency coreless induction melting furnace for melting at a melting temperature of 1300 DEG to 1500 DEG; casting the alloyed nodular iron; carrying out a surface intermediate frequency induction quenching treatment on the alloyed nodular iron via a movable induction heating device with an output power of 20 to 28 kW and at a quenching temperature of 850DEG to 950 DEG; and air-cooling the alloyed nodular iron after quenching. Through the novel proportioning of the chemical components, the alloyed nodular iron die material becomes suitable for the manufacture of large-scale automobile panels in mass production, and is excellent in strength and hardenability.

The invention belongs to the technical field of wet metallurgy of manganese, and provides a process for preparing electronic grade manganous-manganic oxide and byproduct nano-iron oxide red from pyrolusite by means of wet reduction. The process is used for preparing an electronic grade manganous-manganic oxide product by steps of ball-mill screening, preparing (adding a reducing agent), acid pickling, ion exchanging by chelate resin, impurity removing, manganese precipitation, oxidizing, washing, baking and the like, wherein an ion exchange eluent is subjected to iron neutralizing precipitation, filtering, washing and drying, calcining and the like to produce a byproduct nano-iron oxide red; the leaching rate of manganese is over 98 percent, the comprehensive recycling rate is more than 90 percent, the content of manganese in the manganous-manganic oxide is 71 percent, the specific surface area is more than 20m<2>/g, the byproduct nano-iron oxide red product can be prepared, the purity of the nano iron red product is more than 95 percent, and the grain diameter of the nano iron red product is less than 100nm. Compared with the prior art, the purity of the manganous-manganic oxide product is increased, the product quality is more stable, and the production cost is reduced.

The invention discloses a simple, efficient and low-cost method for removing manganese from molten iron in a top and bottom combined blown convertor. The final manganese content of the convertor is controlled to be less than 0.05 weight percent. The method comprises the following specific steps of: adding steel scrap into the convertor, adding the molten iron into the convertor, adding a demanganization agent into the liquid level of the molten iron, supplying oxygen to the liquid level of the molten iron by using an oxygen lance from the top, supplying stirring gas into the molten iron from the bottom, monitoring the CO content of converter gas, and pouring initial slag out when the inhibition of the carbon oxidation is converted into intense carbon oxidation, wherein the amount of poured slag is not less than 60 percent of the total slag amount; and adding the demanganization agent into the liquid level of the molten iron. Compared with the conventional method for removing manganese by a common blowing process or a convertor duplex manganese removal process, the method has the advantages that: special manganese removal equipment is not required, a mature top and bottom combined blown convertor blowing technology is fully utilized, and the dynamical condition for removing manganese from the molten iron is fully met, the common demanganization agent used as the raw material is used, sources are wide, and price is low.

The invention discloses a method for continuously treating electrolytic manganese wastewater to recover manganese and ammonia nitrogen resources, which comprises the following steps: sending electrolytic manganese wastewater into a first-stage stirring reaction tank, regulating the pH value, and adding an ammonium bicarbonate solution at the same time; feeding the reacted wastewater into a first-stage sedimentation tank, adding a flocculating agent for flocculent precipitation, and carrying out filter pressing on underflow sediments to obtain manganese carbonate residues; sending the supernatant overflow and the filter pressing filtrate into a second-stage stirring reaction tank, adjusting the pH value to enable the residual manganese and heavy metal ions to generate hydroxide precipitate,and enabling ammonia nitrogen to generate free ammonia; feeding the reacted wastewater into a second-stage sedimentation tank; feeding the supernatant overflow into a three-stage stirring reaction tank, and adding carbonate to generate calcium carbonate precipitate; feeding the reacted wastewater into a third-stage sedimentation tank; preheating the supernatant overflow, and feeding the preheatedsupernatant overflow into a steam stripping deamination tower for deamination treatment; adjusting the pH value of the effluent of the tower kettle, and discharging the effluent. the purposes of effective treatment of electrolytic manganese comprehensive wastewater and comprehensive recycling of resources are achieved.

The invention relates to a treatment method of electrolytic manganese metal waste residues. The treatment method comprises the following steps: A, grinding gypsum or drying calcined gypsum and then grinding to obtain gypsum powder; B, slurrying the electrolytic manganese metal waste residues, leaching, and adding the gypsum powder; adjusting the pH of a solution to 6.0-6.4, removing iron, carryingout filter pressing to obtain a filter pressing block A and a filter pressing solution A, washing the filter pressing block A with water, and then carrying out filter pressing to obtain a filter pressing block B and a filter pressing solution B; adjusting the pH of the filter pressing solution A to 11.5-12, and carrying out filter pressing to obtain a filter pressing block C and a filter pressingsolution C; C, adding silicon dioxide, calcium oxide, aluminum oxide and iron oxide into the filter pressing block B, drying, pre-decomposing, and calcining to obtain cement clinker; D, slurrying thefilter pressing block C, leaching, adjusting the pH to 6.0-6.4, removing impurities, standing, and carrying out filter pressing to obtain a filter pressing block D and a filter pressing solution D, adding ammonia water into the filter pressing solution D to adjust the pH to 8.8-9, and continuously adding an ammonia water solution to adjust the pH to 11.4-11.8. The method realizes recycling of resources.