38results about How to "Conducive to smelting" patented technology

The invention relates to a method for extraction of potassium and sodium from iron ore and synchronous preparation of ironmaking burden. The method includes: adding a reducing agent into an iron-containing raw material with high potassium and sodium content to prepare carbon-containing pellets of certain granularity, and subjecting an iron-containing raw material with low potassium and sodium content to mixing granulation so as to obtain a mixture; mixing the carbon-containing pellets with the mixture according to certain mass ratio, conducting material distribution and ignition, then circulating a low oxygen gas with a small CO content to perform sintering roasting, thus obtaining the ironmaking burden with certain reducibility and low potassium and sodium content, and gathering potassium and sodium in sintered precipitator dust; subjecting the precipitator dust rich in potassium and sodium to agglomeration and direct reduction to obtain a reduction product and volatile fume; further gathering compounds of potassium and sodium in the volatile fume, and carrying out sulfuric acid agitation leaching, filtering, impurity removing and evaporative crystallization, thus obtaining a potassium salt and a sodium salt. By means of the method provided in the invention, the high quality ironmaking burden can be prepared, the potassium and sodium content of the ironmaking burden can be reduced, the blast furnace alkali load can be alleviated, and extraction of potassium, sodium and other useful resources can be realized simultaneously.

The invention belongs to the technical field of steel smelting and particularly relates to a desulfurizing agent for an RH furnace. The desulfurizing agent comprises, by weight, 1-4.0% of SiO2, less than or equal to 2.0% of Al2O3, 57-70% of CaO, 25-35% of CaF2, less than or equal to 1.0% of FeO, less than or equal to 2.0% of MgO, less than or equal to 0.15% of TC and less than or equal to 0.03% of S. The desulfurizing agent is low in melting point, beneficial to smelting of molten steel in the RH furnace, less in use amount, remarkable in desulfurizing effect and low in cost.

The invention discloses a novel pretreatment process for converter blowing end point steel slag. The process comprises the step of immediately blowing converter gas instead to the top slag surface for40-120 seconds at the end of the oxygen blowing at the converter blowing end point. With the technical solution, the process is simple and the cost is low. Steel slag is gasified and dephosphorized to obtain lower iron oxide content, the yield of molten steel is increased, and the consumption of a deoxidizer and alloy is reduced. The process is beneficial to the whole slag-retaining operation andslagless steelmaking, is beneficial to smelting low-phosphorus steel and ultra-low-phosphorus steel, is beneficial to slag stopping and slag splashing for protection of a converter, and has great economic benefits.

The invention relates to a high-quality RH gunning mix added with a large amount of cast iron powder and a production method thereof. The high-quality RH gunning mix is prepared from the following rawmaterials by weight: 35-60 parts of sintered magnesia, 10-30 parts of magnesia spinel waste bricks, 12-22 parts of a composite binding agent, 5-20 parts of a composite sintering agent, 3-10 parts ofa composite auxiliary binding agent and 0.1-2.0 parts of composite fibers. Compared with the prior art, the RH gunning mix has the beneficial effects that: the proportion of an existing RH gunning mixis optimally designed and improved, a large amount of cast iron powder is added for the first time in the domestic range, the sintering performance of the gunning mix is improved, so that the gunningmix meets the requirement for on-site rapid gunning maintenance of an RH dip pipe, the sintering speed is fast, the sintering strength is high, the adhesiveness is good, no resilience exists, the erosion resistance is good, meanwhile, the production method is simple and the raw material cost is lowered.

The invention relates to a calcium oxide material for clean steel smelting and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: mixing 35-40 wt% of limestone particle, 30-35 wt% of limestone fine powder, 8-22 wt% of magnesium aluminum sol and 5-20 wt% of mixture, stirring uniformly, and painting or casting to form, thereby obtaining the calcium oxide material for clean steel smelting. The mixture is formed by mixing alumina micropowder, magnesite fine powder and calcium lignosulphonate in a mass ratio of 10:(3-5):(0.7-1.5); the particle size of the limestone particle is 7-0.1mm, the particle size of the limestone fine powder is 0.05-100 mu m, and the CaCO3 content of the limestone particle and limestone fine powder is greater than or equal to 92 wt%; and the mole ratio of magnesium to aluminum in the magnesium aluminum sol is 1:(0.4-2.2). The calcium oxide material has the advantages of low impurity content, proper strength and almost no influence on total oxygen content of molten steel, can adsorb oxide inclusions in the steel, and is suitable for preparing the working line of a tundish for clean steel smelting.

The invention provides a method for automatic temperature measurement and sampling of a steelmaking converter door, which includes a running mechanism that moves on the ground track in front of the converter door, a suspended furnace front fire door and a temperature measuring and sampling robot that are jointly installed on the running mechanism. Among them, when the temperature measuring and sampling robot is in the standby position, its steel slag splash protection plate and the suspended furnace front fire door form a complete slag splash and high temperature radiation protection baffle; the robot collects real-time image information of the furnace mouth to provide information for operators to maintain the converter , the robot collects the position information of molten steel and slag blocks, and can independently decide and control the extension distance and insertion position of the temperature measurement sampling probe. The invention uses a robot to replace manual temperature measurement and sampling, which can prevent operators from being scalded by steel slag spray and significantly improve the success rate of operations, and is an advanced technology with wide application prospects.

A heating agent for metal smelting comprises components including, by mass, 21-25 parts of aluminum powder, 2-8 parts of zinc silicate, 5-10 parts of quartz sand, 2-5 parts of kieselguhr, 11-13 partsof silicon carbide, 3-10 parts of an additive, 2-8 parts of water glass, 3-6 parts of pulverized coal, 11-15 parts of nitrate, 3-6 parts of a stabilizer and 8-13 parts of a binding agent. A preparingmethod of the heating agent for metal smelting comprises the following steps that firstly, solid substances in the components are added in a reaction kettle, and ball milling and uniform mixing are conducted; secondly, liquid components are added in the mixture, and uniform mixing is conducted; thirdly, and after natural cooling, the mixture is scattered into powder. The components used in the obtained heating agent do not have harmful influences on the environment, the property of the contained components is stable, the duration of the heating effect is long, the heating effect can be effectively improved, the heat efficiency of heating can be effectively improved, and metal smelting is facilitated.

The invention provides a process layout and operation flow of a temperature measuring and sampling robot for steelmaking production and refining treatment, including: a robot running track parallel to the ladle car track, a robot body, a temperature measuring and sampling gun, and a probe storage rack are arranged on the main operating platform , paper tube scraper and steel sample stripping device, the robot moves on the traveling track, and can reach multiple stations, and complete steel temperature measurement, molten steel sampling, paper tube probe insertion, and paper tube scraping at different stations probes etc. The present invention uses industrial robots to replace manual temperature measurement and sampling, avoiding operators being scalded by steel slag spray, and at the same time, using robots to automatically measure temperature and sampling, by controlling the consistency of the depth and position of the measuring point under the liquid steel surface, the accuracy of the detection data is maintained. Stability and consistency are an advanced technology to ensure the quality of steel products.

A method for preparing spherical granular iron for steelmaking, comprising the following steps: crushing and magnetically separating converter waste slag to screen out granular iron with a particle size of less than 15 mm; cleaning the surface of the granular iron; then air-drying or oven-drying; 75% to 90%, and the mass of the binder accounts for 10% to 25% for batching; put the small iron and binder into the mixer for mixing, and make a material ball of 45 to 65mm after mixing. Low-temperature baking; after the low-temperature baking, the temperature of the material ball drops to 35-45°C, and the material ball is pressed into spherical granular iron with a diameter of 40-60mm. The present invention bonds small grains of iron together, enlarges the size of small grains of iron, facilitates the coating of anti-high temperature oxidation materials on the surface of the grains of iron, and prevents the oxidation of small grains of iron in a high temperature environment of steelmaking, resulting in high loss of grain iron , and can be coerced by light and thin scrap steel in the recycling and processing process, so that small iron particles can be effectively recycled.

Provided are acid-corrosion-resistant high-strength low-nickel duplex stainless steel and a manufacturing method thereof. The duplex stainless steel comprises the chemical components by the weight percentage: 0.01-0.06% of C, 0.20-0.50% of Si, 3.0-3.8% of Mn, 21.0-22.0% of Cr, 1.0-1.5% of Ni, 0.15-0.20% of N, 0.40-0.60% of Mo, 2.0-3.0% of Cu, less than or equal to 0.05% of Co, less than or equal to 0.01% of Sn, less than or equal to 0.01% of Pb, less than or equal to 0.5% of the total amount of W, B, Nb, Ti, Co, Al and V, and the balance Fe and inevitable impurities, wherein the ratio of Cu% to Mo% is 5 to 1. The duplex stainless steel has pitting corrosion resistance equivalent to that of S32101 and has acid corrosion resistance superior to that of the S32101, the corrosion resistance in boric acid and other acidic conditions is further improved, the risk of corrosion occurrence is reduced, and the yield strength is increased by 20% or more than that of the conventional S32101; the alloy cost is equivalent to that of the S32101; and ordinary raw materials can be used for smelting products satisfying nuclear power material standards.

The invention discloses a method for removing alkali metals in a sintering process. CaCl2 powder is added in the sintering raw materials, and in the sintering process, CaCl2 powder is reacted with alkali metals existing in the form of silicate in the sintering raw materials to generate more stable NaCl and KCl; since the pressure in the furnace is in a negative pressure state during the sintering, the boiling points of NaCl and KCl are lower, so that NaCl and KCl are evaporated in the combustion layer and discharged to the outside of the reaction zone; simultaneously, the low-temperature reduction strength of the sintered ore is improved by spraying a CaCl2 solution on the cooled sintered ore; due to the adoption of the method, alkali metals contained in the metal ore are effectively removed, the alkali metal load in a smelting process is reduced, the service life of the blast furnace is prolonged and the harm of alkali metals is reduced, thereby being beneficial to the smelting of the blast furnace.

The invention relates to a green energy saving electric arc furnace controlling device, which can lead that the electric arc furnace has little influence on a power system, can increase production efficiency of the electric arc furnace and reduces unit consumption. The device has the technical proposal that the green energy saving electric arc furnace controlling device is characterized in that the device is also provided with a switch transformer, a main control unit circuit and a phase-control trigger element circuit; the beginning terminal of the primary side winding of the switch transformer is connected with a power supply by a breaker while the end is connected with the corresponding tap of an arc furnace transformer; two ends of the secondary side winding of the switch transformer are connected with thyristors which are positive and negative in parallel connection. The main control unit circuit and the signal input end of the phase-control trigger element circuit are connected with a current transformator, a pressure transformator. The given input end of the phase-control triggers element circuit is connected with the output end of the main control unit circuit output. The output end of the phase-control trigger element circuit is connected with the control end of the thyristors.