37results about How to "Advanced technical indicators" patented technology

The invention relates to a smelting method of a high-iron multi-metal zinc concentrate. The method comprises the following steps: performing oxygen-enrichment oxidation melting on a zinc concentrate containing 14% to 20% of Fe, 0.03% to 0.10% of In, 0.2% to 0.6% of Cu, 0.2% to 0.6% of Cd, 0.005% to 0.02% of Ag, 0.1% to 0.2% of Sn and 40% to 50% of Zn so as to generate an oxidized flue gas and molten slags; preparing the oxidized flue gas into sulfuric acid; performing reduction smelting on the molten slags in a smelting pool so as to generate a crude zinc alloy, crude copper containing silver and slags; blowing the slags so as to obtain smoke dust and blown slags; returning the smoke dust to be subjected to reduction smelting; selling the blown slags in a market; extracting the copper and the silver from the crude copper containing silver; and performing four-stage distillation on the crude zinc alloy entering an electric-heating graphite vacuum furnace so as to generate a pyrogenic distilled zinc product, a crude cadmium product and a high-indium-tin zinc alloy which is used for extracting indium and tin. The method is reasonable in process, good in comprehensive recovery, high in production efficiency, low in production cost and clean and environmentally friendly in production process.

The invention relates to a comprehensive utilization process of zinc-containing iron dust. The process comprises the steps of: uniformly mixing iron-containing dust mud, iron-containing dust, carbon-containing sludge, pyrite residue, first reducing coal and an additive, and carrying out moist grinding, pelletizing and screening to obtain qualified raw pellets; and then uniformly mixing the raw pellets with second reducing coal, carrying out downdraught drying and reduction roasting on a pellet sinter roasting machine to finish sintering of metallized pellets, carrying out nitrogen cooling to room temperature, and discharging to obtain the metallized pellet sintered ore. According to the invention, the process method is simple and convenient for operation; aiming at the characteristics of the zinc-containing iron dust in steel mill, high-efficiency utilization of iron, zinc, carbon and other valuable elements is realized by pelletizing and metallized roasting, and at the same time, harmful elements are removed and secondary pollution is eliminated; at the same time of removing the harmful elements, the zinc-containing iron dust is prepared into metallized pellet sintered blocks, and iron has high grade and low content of zinc, sulfur and other harmful elements, and can be used as a high-quality raw material to be directly entered into a blast furnace for smelting, therefore, the comprehensive utilization process plays an effect of reducing coke and increasing yield on the blast furnace and has significant economic benefits.

The present invention is fast detection method of aflatoxin B1 in food and feed. The fast detection method includes the following steps: adding ground sample to be tested in 2-10 g in test tube, adding methanol-sodium chloride aqua of 50-80 % concentration in 10-25 ml, ultrasonic extraction in water bath at 40-60 deg.c, and suction filtering to obtain filtrate in 4-10 ml; adding re-distilled petroleum ether in 2-4 ml into the filtrate, shaking, letting stand to laminate, taking the lower layer of solution in 1-4 ml and adding pure water in 4-20 ml; adding to micro immunoaffinity column of aflatoxin B1, washing with methanol aqua of 10-40 % concentration in 5-10 ml, eluting with methanol in 0.5-2.0 ml, collecting the eluted liquid, adding test agent A in 0.2-1.0 ml; and detecting in fluorescent spectrophotometry or similar instrument. The present invention has the features of simple process, high detection precision and stability, fast detection speed and high safety.

The present invention relates to a method for preparing high strength green pellets from steel plant iron-containing dust. The method comprises the following steps: taking sludge, dry dust, sulfuric acid residue, dry coal fines, and quick lime to prepare the materials; uniformly stirring the sludge, mixing the sludge with the dry dust, the sulfuric acid residue, the dry coal fines, and the quick lime, stirring and uniformly dispersing, and carrying out piling-ripening for 8-24 hours to obtain a mixed clinker; and carrying out damp milling and balling on the mixed clinker. The method of the present invention has the following advantages that: the process is simple, the production cost is low, and the technical indicators are advanced. The prepared green pellets have characteristics of water content of 10-15%, falling strength of 4-8 times / 0.5 m, compressive strength of 10-15 Newton / per pellet, and granularity of 5-16 mm, and provide high-quality raw materials for the subsequent successful metal pellets sintered roasting dezincification. In addition, the method is suitable for industrial application.

The invention extends the connotation range required to be protected on the basis of a previously issued patent ZL200710025045.4, i.e., a nanometer microcrystalline composite filter material and a preparation method thereof, belonging to the field of a water disposal technique material. According to weight percentage, the nanometer microcrystalline composite filter material comprises 3-95 percent of attapulgite clay, 5-80 percent of sepiolite clay, 2-25 percent of kaolinite clay, 2-97 percent of tubular halloysite, 5-75 percent of diatomite, 5-75 percent of natural zeolite (clinoptilolite, mordenite and the like), 0-25 percent of pillared montmorillonite, 0-50 percent of expanded vermiculite, 0-5 percent of expanded perlite and 0-50 percent of active carbon or bamboo carbon powders. All raw materials which are powder shapes are mixed according to proportion and stirred to granulate by adding an inorganic adhesive, then sintered and activated at the temperature of 900-500 DEG C (inert gas is required for sintering and activating the filter material added with active carbon). The nanometer microcrystalline composite filter material has smooth shape, rough surface and uniform particle size, with the diameter of 1-10mm, and is used for biological filter tanks and high-class adsorption filter materials in deep purification systems of drinking water and reclaimed water sewage disposal systems.

The invention discloses a suspension centre automatic adjusting method of a leveling spreader for a spacecraft; according to the method, measured values of a tension sensor and a dip angle sensor and intrinsic parameter of the spreader are used as input, displacements respectively in the X and the Y directions of an XY worktable are calculated by using different formulae, and then iteration is carried out repeatedly until the measured values of the sensors meet the levelness lifting requirement. Compared with the prior art, the accurate adjusting method disclosed by the invention solves the difficulty of fast and automatic leveling of the suspension center of the spreader in a two-dimensional plane, has advanced technical index, achieves digitization and automation of the adjusting process, improves suspension precision and suspension efficiency, reduces labor intensity of operators, can reach the levelness within the range of 5mm / m by only three times of adjustments, and has significant value in application.

The invention discloses a manufacturing technology for a high-speed and high-temperature precision deep groove ball bearing. A complete set of bearing product is manufactured by processing a forge piece blank into a workpiece billet with an outer ring and an inner ring, then respectively performing technical processes of respective technologies of cold rolling, thermal treatment, coarse grinding, thermal stabilization, fine grinding, grinding and the like, performing inspection and then performing cleaning and assembling. In the cold rolling technique, a cold rolling machine tool is used, a main driving forming rolling wheel is used as an outer die of a mold, and a driven forming mandril is used as an inner die of the mold, so that the forming rolling wheel drives the workpiece billet to rotate, and a supporting wheel pushes the forming mandril to forwards feed and extrude the workpiece billet to roll and form a product; in the thermal stabilization technique, the workpiece subjected to coarse grinding is subjected to heat preservation in a tempering furnace at temperature of 400 DEG C for 4 hours and then is taken out for natural cooling. The limit rotating speed of the complete set of bearing is 12,000 r / min, and the limit working temperature is 160 DEG C; the working noise is less than or equal to 45 dB; the rated load is Cr41.2KN and Cor24KN. The manufacturing precision is high, and the matching performance is high.

The invention discloses a high-grade magnet concentrate preparing method of sulfuric slag composite ball, which is characterized by the following: adopting reducing sintering method; conversing hematite in the sulfuric slag into magnetic ore; dissolving harmful element (Cu, Zi, S) in the salt; rolling sulfur in the non-magnetic phase or easily soluble sulfate; using wet magnetic cobbing technology to enrich iron; removing the harmful element.

The invention discloses a two-gear big-speed-difference speed changer which mainly consists of an input shaft, a primary sun wheel, a primary planet wheel, a primary planet carrier, an inner toothed ring, a secondary planet wheel, a secondary sun wheel, a secondary planet carrier and a gear shifting control mechanism; the input shaft is connected with a motor or a hydraulic motor; the input shaft is engaged with the primary planet wheel arranged on the primary planet carrier through the fixedly connected primary sun wheel; the primary planet wheel is connected with the secondary planet wheel by sharing the inner toothed ring; the primary planet carrier is fixedly connected with the secondary sun wheel; the secondary sun wheel is engaged with the secondary planet wheel sleeving the secondary planet carrier; the secondary planet carrier is in flange connection with an output shaft; the gear shifting control mechanism comprises a control toothed shaft connected with the inner toothed ring, a toothed seat connected with a housing, a sliding toothed sleeve, a toothed seat connected with the output shaft, and an output flange; the inner toothed ring is connected with a control toothed seat; the control toothed seat is connected with the sliding toothed sleeve; and through the sliding toothed sleeve, one side of the control toothed seat is placed on the toothed seat connected with the housing, and the other side of the control toothed seat is placed on the toothed seat connected with the secondary planet carrier.

The invention discloses a method for treating high-iron and multi-metal zinc concentrate. The method comprises the following steps of: boiling and roasting zinc concentrate containing 14-20 percent of Fe, 0.03-0.10 percent of In, 0.2-0.6 percent of Cu, 0.2-0.6 percent of Cd, 0.005-0.02 percent of Ag. 0.1-0.2 percent of Sn and 40-50 percent of Zn to produce flue gas and a roasted product; preparing sulfuric acid by using the flue gas; blending the roasted product in a reducing agent to be reduced and smelted to produce a crude zinc alloy, crude silver-containing copper and furnace cinder; blowing the furnace cinder to obtain soot and blown furnace cinder, returning the soot to be reduced and smelted, and selling the blown furnace cinder; extracting copper and silver from crude silver-containing copper; enabling the crude zinc alloy to enter a conventional distillation tower for performing four stages of distillation to produce a pyrogenic process distilled zinc product, a crude cadmium product and a high-indium, tin and zinc alloy; extracting indium and tin from the high-indium, tin and zinc alloy. The method is reasonable in process, good in comprehensive recovery, high in production efficiency, low in product cost, and clean and environment-friendly in production process.

The invention discloses a white cement clinker bleaching process which comprises the following steps: 1) performing water spray quenching on high-temperature white cement clinker discharged from a kiln to 550-600 DEG C through a single-drum bleaching machine; 2) performing air cooling on the white cement clinker quenched to 550-600 DEG C to 100 DEG C or below through a grate cooler, and simultaneously introducing hot air discharged from the grate cooler into a kiln entrance cover of the rotary kiln and a decomposition furnace to respectively serve as secondary air and tertiary air for supporting the combustion of fuel. The invention also discloses equipment for realizing the white cement clinker bleaching process. According to the invention, the functions of cement clinker bleaching, cooling and heat recycling are combined; the heat of the white cement clinker can be recycled under the condition of ensuring the bleaching and cooling of the white cement clinker; and the heat loss of a firing system can be greatly reduced.

The invention relates to a method and a smelting furnace for processing a high-iron multi-metal zinc concentrate. The method comprises the following steps of: adding the zinc concentrate which contains the following components in percentage by weight: 16%-24% of Fe, 0.02-0.40% of In, 0.2%-2.0% of Cu, 0.004%-0.04% of Ag and 36%-48% of Zn to the smelting furnace, successively carrying out three processes including oxygen-enriched oxidation smelting, weak reduction smelting and strong reduction smelting to product sulfur dioxide fume, a copper-silver alloy, smelting slag and zinc-indium smoke dust, wherein the sulfur dioxide fume is used for preparing sulfuric acid, the smelting slag is externally sold, the copper-silver alloy is separated to extract copper and silver, and the zinc-indium smoke dust is subjected to neutral leaching to obtain a neutral leaching solution and neutral leaching residues; producing electrolytic zinc through the neutral leaching solution according to a conventional process; carrying out two-stage acid counter current leaching on the neutral leaching residues to obtain a low-acid leaching solution and high-acid leaching residues; returning the high-acid leaching residues to the smelting furnace for smelting, producing fine indium by using the low-acid leaching solution according to a conventional P204 extraction process, and returning extraction raffinate to neutral leaching. The method disclosed by the invention has the advantages of short process flow, high production efficiency, low production cost, good integrated recovery and clean and environment-friendly production process.