49results about How to "Improve furnace condition" patented technology

The invention relates to a melting method of the antimony blast furnace adopting oxygen-rich air. The melting method is characterized in that the oxygen produced by an air separation oxygen manufacture equipment or a liquid oxygen vaporizing device is transmitted into an air pipe at the front end or the back end of a blast fan through a pipeline, and mixed with air into oxygen-bearing oxygen-richair with volume concentration more than or equal to 22 percent according to a set proportion, and the oxygen-rich air is led into blast furnace through a blast hole. The melting method is suitable for processing various antimony bearing materials such as oxidized antimony ore, antimony sulfide ore, mixed sulfide-oxide antimony ore, jamesonite, recycled material during the antimony smelting, etc. which bear more than 15 percent of antimony; and the melting method is also suitable for processing the block or powder antimony material provided with various different appearances which is processedby balling. The bed processing ability of the melting method is enhanced by more than or equal to 50 percent, the coking rate is reduced by more than or equal to 40 percent, the iron ore rate is reduced by more than or equal to 40 percent, the comprehensive recycling rate for the antimony is up to 97 percent or more than 97 percent, the SO2 concentration in the waste gas is enhanced by 50 percentto 100 percent, and the better condition for the next waste gas desulphurization (or acid making ) processing and the standard discharging is provided.

The invention discloses a phosphorous pig iron desulfurizer used for casting a pre-roasting anode. The desulfurizer is prepared from the following raw materials by mass percentage: 2 to 4 percent of graphite, 35 to 45 percent of CaO, 3 to 5 percent of CaF2, 1 to 3 percent of Na2CO3, 40 to 50 percent of Na2SiO3, and 1 to 3 percent of FeO. By adopting the phosphorous pig iron desulfurizer used for casting the pre-roasting anode, the adding amount of the desulfurizer is 2.5 percent in each ton of phosphorous pig iron; when the desulfurizer is used in a 1.6-ton induction furnace, the produced phosphorous pig iron can meet use requirements on composition as well as performance, so that the speed of smelting the phosphorous pig iron in the induction furnace is quickened, the smelting time of thephosphorous pig iron is shortened, the electric energy is saved, and the smelting cost is saved by about 15 percent; moreover, good furnace conditions and operational conditions are kept for smelting, the working environment for workers is improved, and the labor intensity of the workers is lowered.

The invention discloses a Cr-Fe powder ore cold-hardened pellet binder comprising the following components in percentage by weight: 70-80 percent of silicon micro powder, 19.81-29.78 percent of light calcined magnesia and 0.19-0.22 percent of trimeric sodium phosphate. The invention also discloses a process for pelleting by using the binder, which comprises the following steps of: adding 6-8 percent by weight of binder in 76-84 percent by weight of Cr-Fe powder ore; then adding 4-8 percent by weight of blue carbon powder; after dryly mixing for 2-3min by an edge milling type stirring mill, adding 6-8 percent by weight of reinforcer, and wetly mixing for 5-10min; then discharging and putting into a roller type ball press for pressing to form pellets; and then drying at the temperature of 150-200 DEG C and the wind speed of 1.0-1.8m / s for 30-40min to obtain finished Cr-Fe pellets. The carbon ferrochrome produced by the invention has the advantages of increasing the yield by 15-20 percent, reducing the electricity consumption by 12-16 percent and lowering the comprehensive cost by 10-12 percent.

The present invention provides a blast furnace screw material distribution correcting method. According to the method, an inverse carrying material distribution performing mark button is arranged in a screw material distribution list image; a material distribution correcting process is additionally set in a blast furnace top material distribution process; a screw material distribution performing ring position Xj corresponding to the final material distribution ring position X1 is set in advance; during an ore material distribution process, the material distribution sluice tilting angle of the X1 is performed according to the Xj tilting angle; during the material distribution process, when the weight displayed by a weighing cabinet produces the large change, the material distribution collecting process is manually started, and the material distribution sluice automatically tilts upward according to the retrieved tilting angle of the screw material distribution performing ring position Xj; and after the batch material distribution is completed, the tilting angle of the screw material distribution recovers to perform the originally-set furnace top material distribution process. With the method of the present invention, the condition that the material at the final ring position is centralized and distributed at the center position in the furnace can be avoided, such that the center gas flow in the blast furnace is active, the distribution of the gas flow in the furnace is rational, the furnace condition is improved, and the smooth blast furnace smelting production can be ensured.

The invention provides a closed type calcium carbide furnace charging nozzle and a process for producing the same. The charging nozzle mainly comprises two groups of seamless external casings, seamless internal casings, water inlet pipes, water outlet pipes, communication pipes and bottom edge embedded flanges; the seamless internal casings are arranged in the seamless external casings; the bottom edge embedded flanges, the water inlet pipes and the water outlet pipes are arranged on the two groups of the seamless external casings respectively; and the two groups of seamless external casings are communicated with the communication pipes. The charging nozzle has the advantages of solving the problems of water leakage due to frequent breakage and frequent shut-down of the furnace for exchange, meeting the requirements on the charging production of a closed type calcium carbide furnace, effectively improving quality structure of material layers around electrodes, greatly improving furnace conditions (avoiding piling of materials on the outer side of the charging nozzle), making the materials keep a steamed bread-shaped charge surface around the electrodes, further effectively reducing thermal loss, alleviating the insufficiency of the materials in the central region of the furnace, reducing the temperature of the charge surface, reducing exposing areas of the electrodes, reducingthe thermal loss of electrode resistances, improving the quality structure of the material layers, contributing to improving the pre-heating of the furnace materials and forming a big crucible region, ensuring good furnace conditions, avoiding frequent occurrence of material stamping and material throwing, and further facilitating the technical operation and control of the furnace and high yield,high quality and low energy consumption of the furnace.

The invention provides a furnace maintenance vanadium-titanium pellet for normal blast furnace and a production method thereof. The vanadium-titanium pellet comprises the following constituents: 50%-55% of TFe, 5%-8% of SiO2, 2%-4% of MgO, 2%-3% of Al2O3, less than 1% of MnO, less than 1% of V2O5 and 5%-15% of TiO2. The method comprises the following steps of: dosing with vanadium-titanium mineral powder, vanadium extraction tailings and iron ore concentrate powder; further adding 1%-5% of adhesive, and then, mixing materials while stirring; and after mixing the materials, further adding water for pelletizing, wherein the dosage of the vanadium-titanium mineral powder, the vanadium extraction tailings and the iron ore concentrate powder is determined according the requirements on the constituents of the furnace maintenance vanadium-titanium pellet for normal blast furnace. The furnace maintenance vanadium-titanium pellet can be used for improving the slag melting point and viscosity of the blast furnace in normal iron ore smelting process on the premise of meeting the normal production of the blast furnace, and after the furnace maintenance vanadium-titanium pellet is used, the furnace condition of the blast furnace can be improved, the smooth operation of the blast furnace is guaranteed, and the furnace age of the blast furnace is prolonged.