36results about How to "Change chemical composition" patented technology

The invention relates to a laser welding method of a titanium alloy-stainless steel dissimilar metal by adopting a composite intermediate layer, and belongs to the technical field of material welding (connection). According to the method, laser is adopted as a welding heat source, and a Ta/V/Fe composite layer is used as an intermediate layer material, so that formation of an omega brittle phase in a titanium alloy-vanadium welding line and an alpha brittle phase in a vanadium-stainless steel welding line can be controlled, the joint brittleness can be reduced, and the joint performance can be improved; by adopting the two welding, a high-quality high-efficiency welding joint which is made of a dissimilar metal material and contains a titanium alloy-vanadium welding line, an unmolten vanadium layer and a vanadium-stainless steel welding line can be obtained. The process comprises the steps of plate assembling and clamping, preload adjustment of a titanium alloy-intermediate layer-stainless steel contact face, and laser welding along the center line of a Ta intermediate layer and the center line of a Fe intermediate layer, so that connection of the titanium alloy-stainless steel dissimilar metal can be realized. The method has the advantages of stable welding process, attracted welding line formation, no welding defects including crack, pore, undercutting, uncomplete welding, incomplete fusion and the like, and good welding process performance.

The invention provides an efficient composite fluxing agent for improving melting characteristic of gasified pulverized coal slag. The efficient composite fluxing agent is compounded by two or more ore powders containing basic oxides. The efficient composite fluxing agent comprises the components by weight percentage of 12-30% of MgO and 3-30% of CaO. As for the coals at the mine field in the northern Anhui province, when the addition amount is 2-6%, the melting temperature of the pulverized coal can be reduced from 1500 DEG C to below 1400 DEG C, the viscosity of the pulverized coal can be ranged from 2 to 25 Pa*s, thus effectively improving the melting characteristic of the coals in the mine field in the northern Anhui province. The fluxing agent can be used for replacing lime stone fluxing agent and the addition amount is only half of that of the lime stone.

The invention discloses a method for preparing a tobacco sheet through an enzymolysis extraction-Maillard reaction composite technology. The method comprises the following specific steps: carrying out enzymolysis extraction simultaneously on tobacco powder in water, carrying out solid-liquid separation, concentrating the enzymolysis liquid, adding with reducing sugar and amino acid and carrying out Maillard reaction at 70 DEG C, uniformly coating paper base with the reaction liquid, drying, and shredding, and thus obtaining the tobacco sheet. With the adoption of the enzymolysis extraction-Maillard reaction composite technology, the advantages of the preparing process of the tobacco sheet through the paper-making process are exerted, meanwhile, the two technological means of the enzymolysis and the Maillard reaction are comprehensively utilized, so that the extraction efficiency of the tobacco aroma materials is improved, and moreover, the chemical components of tobacco are selectively changed, so that the purposes of aroma enhancement and harm reduction are achieved, and therefore, the method has the incomparable advantages.

The invention provides a method for preparing ferronickel byproduct active smelting electric furnace grain slag through red mud and nickel laterite ore. The method is characterized by comprising the following steps that 1, proportioning is carried out, specifically, raw materials include the red mud, the nickel laterite ore, coke powder and lime; and 2, reduction smelting of a smelting electric furnace is carried out, specifically, clusters formed through the raw materials prepared in the step 1 are conveyed into the smelting electric furnace for reduction smelting, slag and iron separation is completed through slag pre-making, melting and reduction, a furnace slag layer is formed, the furnace slag is discharged out of a slag opening regularly and subjected to water quenching or air-cooling pelletization, and the active smelting electric furnace grain slag is obtained. The smelting electric furnace grain slag prepared through the method can serve as a mixed material applied in the cement production process, the cement performance is improved, the variety and labels of cement products are adjusted, and the production cost is reduced; and meanwhile, the slag can be used for producing a concrete admixture independently or by being combined with other raw concrete admixture materials, and the resource utilization of the ferronickel byproduct active smelting electric furnace grain slag prepared through the red mud and the nickel laterite ore is effectively achieved.

The invention relates to a method for operating at least one precombustion chamber-fired internal combustion engine (1), in particular a stationary gas Otto cycle engine, having a pilot chamber (2) and a main combustion chamber (3) associated with the precombustion chamber (2), wherein a gas mixture is fed to the precombustion chamber (2) as flushing gas (S), wherein a synthesis gas (R) generated in a fuel reformer (4) and a fuel (B2) from a fuel source are fed to the flushing gas (S) and wherein a fuel (B1) and at least one further substance stream (D, L, A) are fed to the fuel reformer (4) for the reforming process, wherein at least one operating parameter of the at least one internal combustion engine is monitored, wherein in accordance with a change in the at least one operating parameter the chemical composition of the flushing gas (S); is modified by changing the mass stream of the at least one further substance stream (D, L, A).

The invention provides an in situ heat injection treatment device of root nematodes in soil. The in situ heat injection treatment device comprises a steam distribution chamber, a heat injection mechanism and a supporting plate, wherein the supporting plate is connected with the steam distribution chamber through an elastic mechanism, and the heat injection mechanism comprises a heat injection pipe and a protecting sleeve; the upper end of the heat injection pipe is fixedly connected to the bottom of the steam distribution chamber and is communicated with the inside of the steam distribution chamber, and the protecting sleeve is rotatably arranged on the supporting plate in situ; the protecting sleeve is sleeved on the heat injection pipe, and the two ends of the heat injection pipe extend out of the protecting sleeve; air outlets are distributed in the wall of the heat injection pipe and a pin shaft is arranged on the heat injection pipe, and air outlet slots are distributed in the wall of the protecting pipe and a spiral slot is arranged in the protecting pipe; the pin shaft in the heat injection pipe is positioned in the spiral slot, and the steam distribution chamber is a sealed container; and a steam inlet is arranged in the steam distribution chamber. The in situ heat injection treatment device provided by the invention has the advantages of simple structure, convenience in operation, low treatment cost and good effects, and effectively kills the root nematodes in soil though steam heat injection in situ.

The invention belongs to the technical field of heating cigarettes, and particularly relates to a preparation method and application of a novel heating cigarette spice with a smoke regulation and control function. The preparation method comprises the following steps: fermenting a mixed raw material of Zimbabwe flue-cured tobacco and tea leaves by using bacillus at 25-30 DEG C, taking out a fermentation substrate after 5-10 days of fermentation, and extracting the fermentation substrate by using an ethanol solution with the concentration of 60-80wt% to obtain a crude extract; and filtering the crude extract by using an ultrafiltration membrane with the molecular weight of 10,000-30,000 under the conditions of room temperature and operation pressure of 0.16-0.18 MPa to obtain the novel spice. Chemical components of tobacco leaves and tea leaves are changed by utilizing a microbial fermentation technology and a novel extraction and separation technology, and novel precursor-aroma substances are extracted and separated from the chemical components and are added into the heated cigarettes, so that the release amount of harmful substances in smoke of the heated cigarettes is effectively reduced, the smoking quality of the heated cigarettes is improved, and the smoke is rich and full; and miscellaneous gas and wood gas are covered, so that the taste is mellower.

The invention discloses a mobile laser focus-induced pulse micro arc discharge method and application thereof. According to the method, a tool electrode and a workpiece are used to form an electrode pair; laser pulse is focused on the surface of the workpiece to form a high ionization zone; the tool electrode is induced to discharge towards the high ionization zone; and meanwhile, a laser focus point moves according to the preset frequency and path and a discharge point is induced by the high ionization zone to move along with the laser focus point, so that controllable and ordered motion of the discharge point is realized. According to the method, on the premise of ensuring the setting and distribution of the discharge position, the electric arc pressure is controlled by controlling the scanning area of the laser focus point, so that the relatively-flat workpiece surface is obtained under the same input energy, the later grinding amount is reduced and the effective strengthening depth is increased.

The present invention relates to a nano compound condom, Every condom contains a solid metal cation carrier material which is formed from (NaAg)2ZrPO4 or (NaNn)2ZrPO4 or (NaCu)2ZrPO4 or their mutually-combined product and whose microparticle size is below 0.1 micrometer and whose weight is 0.01-0.8 of that of emulsion. Its released metal cation can change the chemical composition of bacterial mechanism, and can break the acid protein on which the bacteria depend for existance, can kill AIDS vines and various VD pathogens, and can prevent cross-infection.

The invention relates to the technical field of liquid processing of materials, in particular to a method for protecting an ultrasonic probe from damage and erosion while realizing indirect treatmentof a metal melt by propagating ultrasonic waves through mixed molten salt (or slag and a fluxing agent). The method comprises the following steps: A, alloy raw materials are prepared and smelted; B, molten salt powder is prepared and melted; C, the molten salt is poured; D, the ultrasonic probe is immersed in the molten salt; E, ultrasonic treatment is conducted; F, the ultrasonic probe is removed; and G, solidification forming or pouring is conducted. According to the technical scheme, the problems that in the prior art, an ordinary ultrasonic probe is very prone to cavitation thermal corrosion, the melt is polluted, the chemical compositions of the melt are changed, and the significance of ultrasonic treatment is lost; and the ultrasonic probe made of metal ceramic is excessively high incost and long in production cycle, is prone to being bumped and damaged, and needs to be fully preheated to avoid explosion due to the over-high temperature, and thus the ultrasonic probe has the requirements for care and cautiousness in operation to avoid damage are solved.

The invention discloses a slag modification reducer. The slag modification reducer is shaped like spherical particles with a particle diameter of 10-30 mm and comprises 100 parts by weight of a fusionagent, 5-24 parts by weight of a reduction agent, 8-18 parts by weight of a binder and 0-10 parts by weight of a fluxing agent. The invention also discloses a method for Fe recovery with slag waste heat. The method comprises the following steps: (a) during a course when slag is discharged from a smelting furnace and poured into a heat-preservation container, the slag modification reducer is addedinto a slag flow, and a modified reduction reaction takes place; and (b) after the slag completes the reaction with the modification reducer, solid slag in the heat-preservation container is crushed,and metal Fe particles and/or Fe ore concentrate powder are obtained through magnetic separation. The method aims at the fact that the slag contains a lot of waste heat and residual Fe resources, directly conducts high-temperature waste heat modification of the slag, adjusts chemical components and a smelting temperature of the slag, reduces reduction potential energy of Fe oxides and then uses amiddle-low temperature roasting temperature and a grinding-separation technology to realize efficiency recovery of Fe in the slag.

The invention provides a welding stick embedding vacuum electron beam welding method. A low-carbon welding stick is embedded in an initial weldment, and two continuous casting sheet billets are stacked and welded together through an electron beam in the vacuum environment and then are used for subsequent steel rolling production. The low-carbon welding stick is embedded, chemical components of a molten bath can be finely adjusted, a peritectic reaction area is avoided, and welding crack sensitivity of base metal is reduced. Compared with self-fluxing vacuum electron beam welding, the beneficial effects of high-energy density, high penetration performance, the small welding deformation area, easy control, the high production efficiency and the like of self-fluxing vacuum electron beam welding can be kept, meanwhile, the assembling precision during butt welding can be obviously improved, welding line formation is improved, and the mechanical performance of connectors is improved. By means of the method, the problem that a self-fluxing vacuum electron beam welding method is adopted in crack sensitivity steel grade welding, welding cracks happen is solved, the application range of vacuum electron beam welding is greatly enlarged, the method is suitable for mass industrial production, and obvious economical and social benefits are achieved.

The invention relates to a composite membrane material and a preparation method thereof, and belongs to the technical field of building membrane materials. The material consists of a fabric containing UHMWPE (Ultra High Molecular Weight Polyethylene) fibers subjected to surface modification treatment, a macromolecular coupling agent and a thermoplastic resin adhesive film, the surface modification treatment method is a plasma treatment method or a corona treatment method. The preparation method comprises the following steps: carrying out surface modification treatment on UHMWPE (Ultra High Molecular Weight Polyethylene) fibers or a fabric only formed by the UHMWPE fibers, immersing in a polymer coupling agent emulsion, and drying; other textile fibers and the UHMWPE fibers are jointly woven into a fabric, and the fabric and the thermoplastic resin adhesive film are subjected to hot-pressing compounding. Or the fabric only formed by the UHMWPE fibers and the thermoplastic resin adhesive film are subjected to hot-pressing compounding. According to the method, the surface inertness and hydrophobicity of the UHMWPE fiber are improved, and the UHMWPE fiber is compounded with a thermoplastic resin adhesive film.

The invention relates to a technology for reducing harmful ingredients in smoke. The technology comprises processes as follows: step one, backflow elution of tobacco: a used solvent is normal hexane or 95% ethanol, and the tobacco is subjected to backflow elution for 10-60 minutes; step two, solvent recovery: the solvent on the tobacco is removed by using superheated steam; and step three, tobacco structure repairing: glycerin or propylene glycol is mixed with water or ethyl alcohol to prepare a repairing solution, the use amount of glycerin or propylene glycol is 1%-15% of tobacco in percentage by weight, and the repairing solution is uniformly sprayed on the tobacco for repairing for 2-72 hours. According to a cigarette prepared by tobacco treated by the technology, the harmful ingredients in the smoke can be remarkably reduced, and the safety of the cigarette is guaranteed.

The invention relates to the technical field of traditional Chinese medicine and health-care products, in particular to pills capable of strengthening muscles and bones and increasing height and a preparing method and application thereof. The pills capable of strengthening muscles and bones and increasing height are prepared from prepared rhizome of rehmannia, fructus lycii, myrrh, cortex acanthopanacis, frankincense, radix morindae officinalis, cortex lycii radicis, radix dipsaci, cortex eucommiae, rhizoma drynariae, cornua cervi pantotrichum, radix achyranthis bidentatae, flowers carthami, white poria and native copper. According to the pills capable of strengthening muscles and bones and increasing height, main medicine and subsidiary medicine are combined, and child retardation of walking, dysplasia, weakness and inability, and limitation to muscle and bone stretching and other congenital diseases caused by bad factors, undernutrition or acquired susceptibility to diseases can be effectively treated.