34results about How to "Guaranteed carbon content" patented technology

The invention discloses a hyper-high purity extracting technology of natural graphite, which comprises the following steps: (1) putting natural graphite in the container to do oxidizing disposal with low-middle carbon content more than 98%; (2) fusing at high temperature; (3) inputting in the metal erosion-proof container; proceeding dealkalization; (4) deacidifying to wash to neutral; (5) proceeding electromagnetic black metal removing disposal in the floating pool; (6) heating in the autoclave from 118 deg, 206 deg and 220 deg separately; (7) using pure water to dispose; (8) dehydrating; (9) drying until the water content is less than 0.1%.

The invention discloses a smelting method of semisteel, which comprises steps of tapping of semisteel, and smelting in a converter when tapping is completed, wherein the semisteel is subjected to silicon increasing by adding a silicon increasing agent into the steel flow during the tapping process. The method can increase both the carbon content and the temperature of the molten steel at the end point of the converter, reduces the TFe content of converter final slag, thus effectively reduces loss of steel materials, is simple in operation, and strong in practicality, and has good application prospects.

The invention discloses a method for preparing a TZM alloy material through spray drying. The method comprises the following steps: 1, placing molybdenum powder, titanium hydride powder and zirconium hydride in a mixer, and uniformly mixing to obtain a mixture; 2, dissolving an organic binder in an organic solvent to prepare a solution; 3, adding the mixture to the solution, uniformly stirring to obtain a slurry, and carrying out spray drying of the slurry to obtain alloy powder; 4, compacting the alloy powder to form a pressed compact; and 5, placing the pressed compact in a sintering furnace, heating the sintering furnace under a vacuum condition, carrying out heat insulation when the temperature in the furnace increases to 1500-1850DEG C, letting hydrogen in the sintering furnace, continuously heating to 1950-2200DEG C, and cooling with the furnace to obtain the TZM alloy. The TZM alloy prepared through adopting the method disclosed in the invention has a guaranteed carbon content, has a controlled oxygen content of below 250ppm, and is obviously better than the TZM alloy prepared through a routine powder alloy method.

The invention discloses a process for one-step reduction of metallurgical composite slag to obtain molten iron and a matte phase, belongs to the technical fields of ferrous metallurgy and non-ferrous metallurgy, and relates to a technology for separating and recovering iron and nonferrous metals of metallurgical composite slag in a reducing melting process. The process comprises the following steps: levigating metallurgical composite slag and then feeding lime and a carbonaceous reducing agent to prepare a carbon-containing pellet; directly restoring the carbon-containing pellet and then achieving slag-matte-iron three-phase layering in a melting furnace; and respectively recovering iron and nonferrous metals. The process is capable of achieving separation of iron and nonferrous metals, and gathering the nonferrous metals into the matte phase to play a comprehensive recovery role in a plurality of metal elements; a serious environment problem is caused by stacking of the metallurgical slag, and great waste of resources is also caused, so that the current situation of utilization of the metallurgical slag is greatly changed by the process; considerable economic benefits and social benefits are generated; and the process has a wide application prospect.

The invention relates to a novel low-carbon aluminum-magnesium spinel carbon brick with high thermal shock resistance and a preparation method of the novel low-carbon aluminum-magnesium spinel carbon brick. The brick comprises 1-90 parts of a corundum spinel carbon reclaimed material, 1-50 parts of corundum particles, 1-40 parts of fused magnesite, 1-40 parts of corundum dedusting powder, 1-8 parts of active alpha-alumina micro powder, 1-10 parts of a spinel-calcium aluminate multiphase material, 0.1-3 parts of metal aluminum powder, 0.1-5 parts of nano carbon black and 1-8 parts of a binding agent. The invention aims to provide a novel high-thermal-shock-resistance low-carbon aluminum-magnesium spinel carbon brick, which solves the problem that in the prior art, materials such as tabular corundum, white corundum, fused magnesite, crystalline flake graphite, spinel micro powder, alumina micro powder and silicon carbide fine powder are used as raw materials; the steel ladle brick is obtained by high-temperature firing, great pollution is caused to the environment, and the raw material cost is high.

The invention discloses a method for smelting ductile cast iron, which comprises the following steps: adding returning iron, scrap iron and scrap steel into a long coil melting furnace layer by layerfor being melted into ductile cast iron base iron, and then adding a recarbonizer, wherein the ingredients are in the following proportion: 35-40 percent of scrap iron or scrap steel and 60-65 percentof returning iron. The scrap steel, the scrap iron and the recarbonizer are used for replacing past pig iron raw materials with higher price, thereby well saving the production cost, facilitating theproduction according to the produced products with different brands and different carbon contents, reducing the labor intensity, ensuring the strict carbon contents of the products, and improving thequality of the products.

The invention discloses an activated rubber powder and a preparation method thereof. The activated rubber powder comprises the following components: a rubber powder, waste engine oil, an essence and astrong resin. The preparation method of the activated rubber powder comprises the following steps: preparing 60-mesh rubber powder by taking waste tires as raw materials; adding waste engine oil, theessence and the strong resin into 60-mesh rubber powder, mixing, putting an obtained mixture into a desulfurization tank, introducing 0.3 Mpa of steam into the desulfurization tank, and releasing pressure and exhausting when the pressure in the desulfurization tank reaches 0.9 Mpa to obtain a modified rubber powder; and cooling the modified rubber powder to below 40 DEG C, screening out caked rubber powder by using a vibrating screen paved with a 20-mesh screen, metering, and packaging to obtain the finished product activated rubber powder. The preparation method is used for solving the problems that the existing common rubber powder has unobvious modification effect on asphalt and can discharge a large amount of carbon dioxide, hydrogen sulfide and other gases in the use process.

The invention relates to a preparation method of an HRB500E niobium-containing titanium alloy deformed steel bar, and relates to the technical field of alloy steel. The preparation method comprises the following steps: step a, controlling, by a central control module, a molten iron pouring device to add a preset volume of molten iron into a converter; step b, adding waste steel, a niobium-titanium alloy and quick lime into the converter; step c, carrying out first-time converter smelting to generate molten steel; step d, carrying out first detection on the molten steel generated by the first smelting; step e, adding the molten iron into the converter, carrying out secondary smelting, and carrying out secondary detection on molten steel obtained after secondary smelting is completed; step f, controlling, by the central control module, the molten iron pouring device to add the molten iron into the converter for third-time smelting, and detecting the molten steel obtained after third-time smelting for the third time; and step g, carrying out argon blowing, continuous casting, rolling and heat treatment sequentially on the molten steel with the carbon content meeting the requirement after third-time detection. According to the method, the quality of the produced deformed steel bar is effectively improved.

A method for smelting primary steel making liquid for a high-alloy steel casting includes the following steps that a preset amount of low-phosphorous slag-free molten steel of the last time is reserved in an electric arc furnace, and high-alloy returns are added into the electric arc furnace; high-alloy returns in an electric melting furnace are conveyed to the electric arc furnace, a power supply is cut off after 70%-80% of the high-alloy returns are melted, then high-alloy returns are added again, power is supplied, an oxygen blowing pipe extends into the furnace after the high-alloy returns become red and molten steel appears when the furnace is inclined, and oxygen is blown towards the high-alloy returns exposed out of the molten steel to complete cutting; large high-alloy return blocks are prevented from being attached to the wall of the electric arc furnace, and the large high-alloy return blocks exposed outside the molten steel are cut and smashed, fall into the molten steel and are quickly molten. After the content of phosphorus in the molten steel meets the preset technical requirements, an aluminum block, CaSi grains and aluminum grains are inserted into the molten steel, and sample analysis is carried out after 15 min; when the mass fraction of Al accounts for 0.03%-0.06% of the total mass of the molten steel and added reduction agents, steel is output.

The invention relates to a manufacturing process of steel of a chain, in particular to a manufacturing process of round pipe steel of a chain, belonging to the processing industry of steels. The manufacturing process of the round pipe steel of the chain comprises orderly processing a belt material by the following steps in sequence: de-rusting, rolling, annealing, acid cleaning, phosphating, washing with clear water, saponifying, flattening and coiling to form round pipe, wherein the rolling is four continuous rolling or five continuous rolling; the annealing is divided into three steps: the first step is heating insulating treatment, wherein the rolled belt material is fed into an annealing furnace to be heated, nitrogen is fed in the annealing furnace when the annealing furnace is heated to 450-500 DEG C, the temperature is kept for 5-7 hours after the heating temperature reaches 670-700 DEG C; the second step is furnace cooling, and the belt material treated by the heating insulating treatment is cooled to be 300-400 DEG C in the annealing furnace. The manufacturing process of the round pipe steel of the chain is simple in process and low in cost; the manufactured steel plate for the round pipe of the chain is high in strength, corrosion resistant and high in precision.

The invention provides a steelmaking method through medium-frequency electric furnaces. According to the steelmaking method, the electric furnace A and the electric furnace B both controlled by a medium-frequency cabinet are involved, raw material is proportioned according to the requirement, the proportioned steel material is equally distributed to the electric furnace A and the electric furnace B, the steel material in the electric furnace A is smelted at 100% power, after the set time is up, molten iron in the electric furnace A is covered with thermal insulation agents for thermal preservation, a power source of the electric furnace A is cut off through a control cabinet, then the steel material in the electric furnace B is smelted at 100% power, and tapping is carried out after the temperature in the electric furnace A and the temperature in the electric furnace B reach the set tapping temperature. When the temperature in the electric furnace A reaches the set tapping temperature earlier than the temperature in the electric furnace B, tapping is firstly carried out for the electric furnace A, and the electric furnace B is covered with the thermal insulation agents for thermal preservation. The steelmaking method is simple and convenient, the quality of produced products is stable, the electric furnaces do not need to be transformed, the utilization rate of the electric energy is high, the electricity is obviously saved, the production efficiency is improved, and the input-outputratio is high.

The invention provides a process for accelerating organic solid waste to generate hydrogen by iron-containing sludge, which relates to the technical field of organic solid waste treatment and comprises the following steps of: crushing and acidifying kitchen waste to obtain hydrogen-producing kitchen waste; carrying out alkaline hydrolysis treatment on the municipal sludge to obtain hydrogen production municipal sludge; mixing the hydrogen production kitchen waste, the hydrogen production municipal sludge and the hydrogen production inoculation liquid to obtain mixed solid waste; and adding themixed solid waste into an anaerobic hydrogen production reactor, adding iron-containing sludge, and carrying out anaerobic hydrogen production reaction at 35-65 DEG C to obtain hydrogen and a mixture. The invention provides a process for accelerating organic solid waste to generate hydrogen by iron-containing sludge. By organically combining the three solid wastes, namely the kitchen waste, the municipal sludge and the iron-containing sludge, the problem of environmental pollution caused by the kitchen waste and the municipal sludge is solved; meanwhile, the solid wastes are subjected to resource recovery, so that the method is green and environment-friendly and has a good application prospect.