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1052results about How to "High carbon content" patented technology

Method for smelting ultra-low carbon steel

The invention provides a method for melting ultra-low carbon steel. The method adopts a desulfuration of molten iron-converter-RH-continuous casting process, wherein a sulfur content in the molten iron is 0.002%-0.006% after desulphurization; converter smelting controls oxygen blowing time, an oxygen gun flow, a bottom-blowing intensity and a smelting period, adopts slag-stopping tapping, steel tapping with a content of C being 0.06%-0.08% and with a temperature of 1650-1680 DEG C, and an oxygen content in the molten iron is 0.03%-0.05%; an RH adopts forced decarburization with a highest vacuum degree of 67-100 MPa and decarburization time of 15-27 min, and a carbon content in the molten iron is 0.0010%-0.0020% and a dissolved oxygen content in the molten iron is 0.025%-0.040% after the decarburization; the molten iron is recycled for 3-5 min after deoxidation by adding aluminium and recycled for another 3-5 min after adding other alloys; a nitrogen content in the molten iron is 0.0015%-0.0035%, and the temperature is 1590-1640 DEG C; and killed steel treatment is carried out for 10-30 min. The method adopts converter tapping with a high carbon and low oxygen content, can use less or not use slag modified agents during the tapping process, accelerates the production rhythm, makes the molten steel cleaner, and reduces the production cost.

Method for preparing biomass carbon by utilizing agricultural and forestry waste

The invention relates to a method for preparing biomass carbon by utilizing agricultural and forestry waste, belonging to the technical fields of preparation of carbon materials and utilization of biomass resources. The method comprises the following steps of: adopting agricultural and forestry waste as raw materials; under the condition of subcritical water, fully mixing dried biomass materials and deionized water according to the proportion of 1:(10-30); under the protection of inert atmosphere, carbonizing for 2-6 hours at the temperature of 220-250 DEG C; and then carrying out vacuum filtration and hot-water cleaning, and drying to obtain the biomass carbon. The biomass carbon prepared by the invention is coaly carbon material with an aromatic-ring structure, is high in carbon content and calorific value and large in specific surface area, and can be used as a soil conditioner or an absorbent. The method has the advantages that the materials are low in cost and easy to obtain, the process is simple, the operation is convenient, the manufacturing cost is low, the industrial promotion is convenient, and the application range and the application value of biomass resources are further expanded in the aspect of carbon materials.

Large-section high-performance hot work die steel for die casting and preparation technology thereof

The invention relates to large-section high-performance hot work die steel for die casting and a preparation technology thereof and belongs to the technical field of an alloy steel preparation technology. The steel is characterized in that main alloy elements in alloy chemical components comprise, by weight, 0.35-0.65% of C, 0.30-1.00% of Si, 0.30-1.00% of Mn, 3.50-5.50% of Cr, 2.00-3.00% of Mo, 0.40-0.80% of V, P being less than or equal to 0.02%, S being less than or equal to 0.01%, 1.00-2.00% of Ni, Nb being greater than or equal to 0.15%, and the balance Fe. The preparation process of the hot work die steel comprises the following steps: burdening, smelting, casting and electroslag remelting; heat treatment by high-temperature heat diffusion, hot working by multi-directional forging and controlled cooling after forging; refining and heat treatment of proeutectoid carbide and isothermal annealing treatment; and heat treatment by quenching and tempering, namely austenitizing by heating to 950-1100 DEG C, oil cooling or mist cooling, and tempering at 540-630 DEG C for two to three times. The hot work die steel provided by the invention has advantages of high hardenability, high thermal stability, high toughness and good resistance to thermal fatigue.

Poly-phosphate flame retardant containing DOPO side-chain structure and preparation method thereof

The invention discloses a poly-phosphate flame retardant containing a DOPO side-chain structure and a preparation method thereof, belonging to the technical field of polymeric organic phosphorus flame retardant structures and the preparation method thereof. The flame retardant is characterized by comprising the following repeating unit structure: wherein n=5-50. The preparation method of the poly-phosphate flame retardant comprises the following steps of: reacting an intermediate I containing the DOPO structure with phosphorus oxychloride to obtain an intermediate II containing phosphorus oxychloride, and fusing and polymerizing the intermediate II and a bisphenol compound to obtain the poly-phosphate flame retardant containing the DOPO side-chain structure. The preparation method is simple, and through adjusting Ar categories and ratios, the phosphorus content can be controlled at 11.5-15.5% and the sulfur content can be controlled at 0-5.9%. The flame retardant has the characteristics of favorable thermal stability, high decomposition temperature, favorable char-forming property, and the like, and can be used for flame retardance modification of materials, such as polyester, polyamide, polycarbonate and blends thereof, and the like, with higher processing temperature.

Process method for processing solid waste of steelworks by utilizing smelting furnace

The invention relates to a process method for processing iron-containing solid waste of steelworks by utilizing a smelting furnace. The process method comprises the following steps: with blast furnace dust containing zinc and lead, revolving furnace sludge, electric furnace fly ash, slag metal, waste metal and the like as principal raw materials, carrying out condensation agglomeration and high-temperature agglomeration, and carrying out operations such as maintaining or cooling and granulation so as to obtain finished agglomerates; after mixing the finished agglomerates with coke, sending the mixture into the smelting furnace to be subjected to high-temperature smelting, simultaneously adding the waste such as zinc-containing waste into the smelting furnace in a certain proportion to finally generate high-temperature mixed gas, separating elements such as carbon from the mixed gas by utilizing a cyclone dust collector at the top of the furnace, recycling carbon-containing dust again, further separating the residual mixed gas by utilizing a bag-type dust collector so as to obtain zinc-rich and lead-rich dust, and recycling the zinc-rich and lead-rich dust and applying the zinc-rich and lead-rich dust to the high-temperature agglomeration, the hot air preheating of the smelting furnace and a smelting furnace purification process; then purifying the collected zinc-rich and lead-rich dust, so as to obtain high-purity zinc and lead products; regularly opening a lead discharging hole in the bottom of the smelting furnace, and collecting lead liquid so as to simultaneously obtain wet lead and products such as molten iron and furnace slag.

Petroleum casing pipe with high strength and high toughness and preparing method thereof

The present invention provides a petroleum casing pipe with high strength and high toughness, wherein the weight of the component element of the casing pipe steel is characterized proportionally. The invention also provides a preparing method for preparing the petroleum casing pipe with high strength and high toughness, wherein the method comprises the following steps: 1. smelting the ingredients and casting the tube blank; 2. punching and tandem rolling of the steel tube; and 3. heat treating. The invention has the following beneficial effects: the performance of the petroleum casing pipe obtained by the method is the performance of the steel with lower content of alloy and the cost is low; a low carbon content is adopted so that the lath martensite tissue is obtained after heat treatment, the high toughness is provided after tempering and a delayed fracture resistance is provided; the complex micro-alloying processing techniques of V, Nb, Ti, B, etc. are adopted for strengthening the matrix, strengthening the grain-boundary strength, increasing the tempering resistance, reducing the content of manganese element, reducing the content of the impurity elements and improving the shape of the inclusion. The rolling ratio is optimized so that the aeolotropism of the material is remarkably reduced and the horizontal and vertical impact toughness of the material is larger than 0.8. The casing pipe of the invention far exceeds the prior highest steel grade requirement of the API standard.

Method for particulate introduction for metal furnaces

A method and an apparatus for advantageously introducing a flame, a high velocity oxidizing gas, and a high velocity particulate flow into a furnace for metal melting, refining and processing, for example, steel making in an electric arc furnace. The steel making process of an electric arc furnace is made more efficient by shortening the time of the scrap melting phase, introducing a more effective high velocity oxidizing gas stream into the process sooner to decarburize the melted metal and introducing a more effective particulate injection to reduce FeO, form or foam slag and / or recarburize. Improved efficiency is obtained by mounting a fixed burner / lance and carbon injector lower and closer to the hot face of the furnace refractory at an effective injection angle. This mounting technique shortens the distance that the flame of the burner has to melt through scrap to clear a path to the molten metal, and shortens the distance the high velocity oxygen and high velocity particulates travel to the slag-metal interface. One method includes supplying a plurality of oxidizing reaction zones with the high velocity oxidizing gas to decarburize the melted metal and a plurality of particulate reaction zones with high velocity flows of particulate carbon for reducing FeO and / or forming foamy slag. The particulate reaction zones are located on the downstream side of the oxidizing gas reaction zones so as to minimize any effect of the reduction reaction on the decarburization reaction and to recover a part of the hot FeO produced in the oxidizing gas reaction zones.

Pulverized coal decoupling combustor with low nitrogen oxide discharge and pulverized coal decoupling combustion method with low nitrogen oxide discharge

InactiveCN102620291ASeparation perimeter lengthSmall steering anglePulverulent fuel combustion burnersIndirect carbon-dioxide mitigationProcess engineeringCoal
The invention relates to a pulverized coal decoupling combustor with low nitrogen oxide discharge and a pulverized coal decoupling combustion method with low nitrogen oxide discharge. The method is implemented through the following two stages: a) stage 1, firstly separating mixed airflow of pulverized coal and air into a concentrated part and a dilute part by virtue of the pulverized coal decoupling combustor provided by the invention, igniting the concentrated pulverized coal airflow, then feeding the concentrated pulverized coal airflow into a hearth, and performing combined combustion on the concentrated pulverized coal airflow and the dilute pulverized coal airflow; and b) stage 2, mixing the mixed airflow with secondary air in the hearth, and fully combusting the pulverized coal semicoke generated in the stage 1 under conditions of rich oxygen and high temperature which is insufficient to generate thermal NOx, wherein in the stage 1, the pulverized coal is pyrolyzed, gasified and gas-fired under reducing atmosphere, volatile components are fully separated out, products of pyrolysis and gasification are utilized to convert fuel-type NOx into more stable N2. According to the invention, an integration design of pulverized coal condensation, stable combustion and low nitrogen oxide discharge can be realized, the equipment structure is compact, the pulverized coal condensation effect is good, the stable combustion capability is strong, and the potential of inhibiting NOx from generating is high.
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