34results about How to "Stable grade" patented technology

The invention relates iron melt improving vanadium content and controlling calcium content cooling agent and the technology, specially relates the cooling agent of adjusting the proportion of cooling agent to stabilize calcium content in vanadium slag and the technology. The technology comprises the 56-60wt% iron scale, 30-40wt% iron concentrate powder containing vanadium, and 5-10wt% anchoring agent. The method stabilizes the calcium content and iron content in vanadium slag, and effectively solves the problems of great fluctuation of vanadium slag composition and superstandard calcium and iron. By controlling the thermoregulation material to meet the requirements of the improving vanadium temperature and calcium oxide content, the method improves the vanadium slag grade and extraction rate. The invention possesses the following characteristics: 1 shortening the converting time; 2 improving the vanadium slag grade and extraction rate, and stabilizing the calcium oxide content; 3 reducing the iron loss.

The invention discloses a comprehensive treatment method of blast furnace dedusting ash, belonging to the technical field of the waste treatment. The method comprises the following steps: adding waterin blast furnace dedusting ash for mixing, performing secondary magnetic separation, performing flotation, in the tailings treatment using a spiral chute to separate iron refined powder and carbon refined powder, screening to recycle the carbon refined powder in the wastewater which is obtained in the step of spiral chute ion-removing and performing filter pressing to the obtained wastewater forrecycling. The method can greatly increase the selection yield and grade of the iron refined powder and carbon refined powder, can also avoid to produce new pollution, protect the environment and recycle waste material.

The invention provides a production method for as-cast high-performance ductile iron QT600-10 by precision-investment casting, wherein a matrix of the as-cast high-performance ductile iron QT600-10 is a mixture of ferrite and pearlite; the pearlite accounts for 35%-55%, the nodulizing grade ranges from grade I to grade II, and the size of graphite ranges from grade VI to grade VII; the material comprises the following final chemical components in percentage by mass: 3.3-3.6% of C, 2.8-3.0% of Si, 0.2-0.4% of Mn, less than or equal to 0.035% of P, less than or equal to 0.02% of S, 0.4-0.6% of Cu, 0.035-0.055% of Mg, 0.02-0.04% of RE and the balance Fe; and a dam type nodulizing treatment and three-time inoculation way is adopted. The produced as-cast high-performance ductile iron QT600-10 has tensile strength Rm greater than or equal to 600 MPa, and elongation after fracture A greater than or equal to 10%. By combining a precision-investment casting production way with a cooling way after shell casting, high-strength high-toughness ductile iron is produced by a precision-investment casting process, so that lightweight design development and production for car parts is realized by virtue of a near net-shape forming process.

The present invention provides a sheet glass laminate structure excellent in penetration resistance (bulletproof nature), crime prevention nature, heat shock resistance, translucency and airtightness. The sheet glass laminate structure (10) is produced by laminating at least three sheets of sheet glass (20) each having a sheet thickness of less than 1 mm with intermediate layers (30) interposed between them. When a central portion 20 mm in length including the middle point of a virtual line and opposite end portions respectively being 20 mm long from the opposite ends of the virtual line are set on the virtual line having a length equal to 50% of the maximum overall dimension of the translucent surface of the sheet glass (20) and extending in parallel with the direction of maximum overall dimension with the center of the translucent surface as its middle point, maximum variation DeltaHmax of the interval H between sheets of sheet glass opposing across the intermediate layer in connection with the central portion and the opposite end portions satisfies the following relation; 0[mu]m<DeltaHmax<20[mu]m.

The present invention provides a printed circuit board which forms a gold conductor of a gold wire bonding part in a thinner way to reduce the number of manufacturing processes and material cost. In the printed circuit board produced by forming a conducting pattern on an insulating substrate by using gold-containing pasty fluid, a low-purity gold layer and a high-purity hold layer used for wire bonding thereabove are stacked on the board. And the present invention also provides a thermal printing head using the printed circuit board.

The invention relates to a method for smelting ferrovanadium through iron particles and steel scraps, and belongs to the technical field of metallurgy. The method for smelting ferrovanadium through iron particles and steel scraps is adopted. The method includes the following steps of a, preparing a raw material and b, smelting. According to the step of preparing the raw material, vanadium oxide, aluminum particles, steel scraps and iron particles are mixed. According to the step of smelting, ignition smelting and standing are conducted, a furnace is removed after natural cooling is completed, and ferrovanadium is obtained. According to the method, the constitution of the ferrovanadium raw material is innovatively optimized, the consumption of steel scraps is reduced obviously, hence, the production cost of ferrovanadium is lowered, the production efficiency of enterprises can be improved, the production cost can be lowered, the alloy quality is improved, the enterprise competitiveness is enhanced, and a broad market prospect is achieved.

The invention discloses a method for improving molybdenum concentrate grade by adopting a concentration stage. The invention comprises the technological process of the ore-feeding closed-circuit regrinding of a concentration I flotation column, a concentration II flotation column, and a concentration IV flotation column. The invention is characterized in that the concentration IV ore feeding, that is, concentration III foam enables pulp to overflow so as to enter the concentration IV flotation column after being classified by a hydrocyclone; a slurry pump is added on the tailings part of the concentration IV flotation column so as to enable the concentration IV tailings to return the concentration III flotation column, thereby forming a closed circuit; and concentration IV foam enters concentration V, the tailings of the concentration V and concentration III foam enters the concentration IV after being reground, and the foam of the concentration IV flotation column is directly regarded as final products. Therefore, the enrichment ratios of the concentration III, the concentration IV, and the concentration V pulp are increased, the flotation time is prolonged, and the grade of the final concentrates is improved significantly.

The invention discloses homogenization and filtration equipment for chemical gypsum. The homogenization and filtration equipment comprises at least one kiln duct, filtration water collection devices,filter layers and vacuum pumps, wherein the kiln ducts are arranged in parallel, the filtration water collection devices are located at the bottoms of the kiln ducts and communicate with the kiln ducts, the filter layers are located in the filtration water collection devices, and the vacuum pumps are connected to the filtration water collection devices; and each filter layer comprises an upper pore plate filter layer and a lower filter cloth filter layer. The invention further discloses a homogenization and filtration method. According to the equipment and the method, large-scale production ofthe high-moisture chemical gypsum can be realized, and the production energy consumption can be effectively reduced; and after the high-moisture chemical gypsum is subjected to homogenization and filtration, the quality (grade and adsorption water) of the chemical gypsum is more stable, the adsorbed water is effectively reduced by 50-60%, the filtering is uniform, the filtering effect is good, the filtering efficiency is high, the quality of filtered gypsum products is stable, the quality is improved, and meanwhile, the quality of downstream products is ensured.

The invention discloses an MPCA (Multiway Principal Component Analysis)-based measurement method for the area of a local region of a copper flotation froth image. The method comprises the following steps: firstly, a three-dimensional RGB (Red, Green and Blue) image is expanded by MPCA to form two-dimensional image data and the two-dimensional image data is projected into an uncorrelated principal component space; then, a local black hydrated region in the image is marked in the principal component space; finally, a principal component image is reconstructed by a load vector, the relation between a principal component space score vector component value and a principal component image characteristic pixel value is used for determining the quantity and space positions of characteristic pixels in the principal component image, the marked local region is mapped to the principal component image and the size of the region is calculated and used as a spectral characteristic of the local region of the forth image. The MPCA-based measurement method for the area of the local region of the copper flotation froth image is applicable to a copper flotation production process and can be used for establishing a production working condition recognition model in a copper flotation process; the MPCA-based measurement method has important meanings of reducing the erroneous judgment rate of a working condition, improving the grade of copper concentrates and realizing the optimization of a copper flotation production and operation process.

The invention relates to a composite inhibitor for reverse flotation of carbonate-containing iron ore as well as a preparation method and application of the composite inhibitor. The preparation method is characterized by comprising the process steps of carrying out stirring and size mixing on carbonate-containing iron ore mixed magnetic concentrate, sequentially adding a composite inhibitor, an activating agent, a collecting agent and a foaming agent for stirring and size mixing, then feeding into a mechanical stirring type flotation machine, conducting reverse flotation roughing operation, and obtaining reverse flotation roughing concentrate and reverse flotation tailings; adding a certain amount of activating agent and collecting agent into the roughing concentrate, and then carrying out primary concentration to obtain reverse flotation final concentrate; and scavenging the roughing tailings twice, and obtaining final reverse flotation tailings. Compared with the prior art, the method has the advantages that by adding the composite inhibitor, the flotation effect is improved, the comprehensive iron ore concentrate grade is greater than 64%, the recovery rate is greater than 85%, and the recovery rate is increased by 3% or above under the condition that the grade is stable.

The invention discloses an efficient collecting agent for zinc separation of lead-zinc sulfide ore. The efficient collecting agent for zinc separation is ethyl thionocarbamate. The invention further discloses a method for separating zinc from the lead-zinc sulfide ore. The method comprises the following steps that in flotation of the lead-zinc sulfide ore, raw ore is ground, and then lead separation operation is conducted; a pyrite inhibitor HD52 is firstly added into tailing pulp of the last scavenging of lead flotation; then, copper sulfate is added into the slurry mixing and stirring barrel before zinc selection and roughing, and ethyl thionocarbamate is added for stirring and size mixing; and then the ore pulp enters a zinc roughing flotation machine for zinc roughing. According to the method, ethyl thionocarbamate is adopted as a zinc collecting agent in flotation of the lead-zinc sulfide ore, so that the sphalerite and the pyrite can be separated by adopting ethyl thionocarbamate with good selectivity to the sphalerite as the collecting agent of the sphalerite under the condition of a natural PH value.

The invention discloses a low frequency AC electromagnetic washing machine. The low frequency AC electromagnetic washing machine comprises a washing cylinder, a concentrated ore cone cylinder, an overflow device, an ore feed device, a water supply device, and a magnetic separator, wherein the magnetic separator comprises an ore gathering magnetic field coil sleeved at the peripheral top of the washing cylinder and a plurality of traveling wave magnetic field coils below the or gathering magnetic field coil, the ore gathering magnetic field coil is connected with single-phase low frequency AC,the traveling wave magnetic field coils are connected with a three-phase low frequency AC, a wiring manner of the traveling wave magnetic field coils is 'Y' shape or 'delta' shape, frequency of the lower frequency AC is lower than 50Hz, an induction magnetic ring is arranged in a position in the washing cylinder corresponding to the ore gathering magnetic field coil, an overflow inner cylinder andthe washing cylinder are identical in diameter, an ore outlet of the ore feed device is in the middle between the first traveling wave magnetic field coil and the second traveling wave magnetic fieldcoil and is in the middle of a distance between the inner wall of the washing cylinder and the outer wall of an ore feed tube, and the water supply device is arranged on the concentrated ore cone cylinder below the washing cylinder. The low frequency AC electromagnetic washing machine produces high quality concentrated ore, has good sorting effect and can be widely used.