42results about How to "No threat to health" patented technology

The invention discloses a novel process of nickel citrate for catalyzing thiosulfate to leach gold. The novel process is characterized in that the nickel citrate catalysis is used for substituting the traditional copper ammonia catalysis, namely the nickel sulfate and the citric acid (or sodium citrate) are added in the thiosulfate gold leaching pulp to substitute the adding of the copper sulfate and the ammonia. By adopting the process, the oxygenolysis effect of the Cu(NH3)4<2+> and S2O3<2-> is eliminated so that the consumption of the thiosulfate is obviously reduced; and besides, the use of the ammonia is cancelled so as to avoid the risk of the NH3 on the environment. The gold leaching rate is equal to that of the copper ammonia catalysis.

The invention relates to a municipal solid waste processing system comprising a sorting system, a pretreatment system, and an anaerobic fermentation system. The sorting system comprises a receiving hopper, a plate feeder positioned on the bottom of the receiving hopper, a uniform material-toggling bag-breaking device, and a cylinder broken bag screening machine. The pretreatment system comprises a crushing device, a sand-water separation device, and a waste receiving hopper connected with a sorting platform. The waste receiving hopper is connected with the crushing device and the sand-water separation device through a conveyor. A slag-discharge screw, a grid, a gas/water circulation device, and a rotary crushing device are arranged in the sand-water separation device. The anaerobic fermentation system comprises a homogenization tank connected with a lift pump. The homogenization tank is connected with an anaerobic digestion tank. The anaerobic digestion tank is respectively connected with a biogas purification device, a power generation system, and a sludge storage tank. The system and the method provided by the invention have the advantages that: with the sorting system, the pretreatment system, and the anaerobic fermentation system, the waste is turned harmless, and is converted into resources. Also, the amount of waste is reduced.

The invention provides lead-free tin-based solder for a solar photovoltaic module. The lead-free tin-based solder comprises, by mass, stibium 0.05 percent-0.15 percent, silver 0.01 percent-0.05 percent, copper 0.1 percent-0.4 percent, indium 0.01 percent-0.05 percent, bismuth 0.2 percent-0.5 percent, gallium 0.06 percent-0.10 percent, phosphorus 0.02 percent-0.09 percent and the balance tin and inevitable impurities. The invention further provides a manufacturing method of the lead-free tin-based solder. The manufacturing method comprises the step that stibium, silver, copper, indium, bismuth, gallium, tin and phosphorus are placed into a smelting furnace according to the mass percentage and are smelted in an inert atmosphere or a vacuum condition, and the lead-free tin-based solder for the solar photovoltaic module is obtained. According to the lead-free tin-based solder for the solar photovoltaic module, melting temperature is low, surface gloss is good, surface oxidation resistance is high, wetting performance is good, and welding quality is superior. Besides, the lead-free tin-based solder is economical, environmentally friendly and free of threat to human health, thereby being applicable to large-scale industrial production.

The invention discloses a ground disinfection robot. The ground disinfection robot comprises a shell, a moving assembly, a water supply assembly, a disinfection assembly and a mopping water absorptionassembly, wherein an equipment cavity is formed in the shell, the moving assembly is arranged at the bottom of the shell, the water supply assembly is located in the equipment cavity, the water supply assembly comprises a clear water tank and a sewage tank, a filter is arranged between the clear water tank and the sewage tank, the shell is provided with a water injection port communicated with the clear water tank, the disinfection assembly is located in the equipment cavity and comprises an ozone water generator used for electrolyzing the water to generate the ozone water and a water pump used for conveying the water from the clear water tank to the ozone water generator, a water outlet of the ozone water generator is connected with a water outlet pipe, an end of the water outlet pipe penetrates through the bottom of the shell and then faces the ground, and the mopping water absorption assembly is used for mopping the ground, absorbing the water on the ground and conveying the absorbed water to the sewage tank. The ground disinfection robot is advantaged in that the ground can be comprehensively disinfected and sterilized, a problem of chemical residues does not exist, and meanwhile disinfection cost is low.

The invention discloses a preparation method of a biological multilayer nerve conduit containing mesenchymal stem cells. The method comprises the following steps: (1) dissolving a photocurable biological hydrogel with a PBS solution containing a photoinitiator to obtain two concentrations of biological ink; (2) collecting mesenchymal stem cells with confluence degree of more than 80%, and resuspending the mesenchymal stem cells with low concentration of biological ink after treatment to obtain cell-loaded biological ink; 3) load that cell-loaded biological ink and the high-concentration biological ink into two nozzles of the biological 3D printing device respectively; (4) setting printing parameters, firstly printing the cell-carrying biological ink on the optical axis rotating uniformly to obtain a first layer of nerve conduit; And then printing high-concentration biological ink to obtain a double-layer hollow tubular nerve conduit; (5) Biological multilayer nerve conduit was obtainedby ultraviolet irradiation. The invention has the advantages of short preparation time, simplicity, mild operation conditions, simple structure, good biocompatibility and degradability of the prepared nerve conduit.

The invention provides an agricultural straw pulverizer, and belongs to the field of agricultural machinery. The pulverizer for pulverizing straws in the countryside at the present generates a lot of floating dust and is not friendly to the operation environment of a farmer, and the agricultural straw pulverize provided by the invention can be used for solving the problem. The agricultural straw pulverizer is characterized in that a movable baffle is mounted at a material inlet of the pulverizer; after straws enter a pulverizing box, blades and hammer sheets work mutually to realize the pulverizing function; a dust collection device is mounted near to the outlet; after being subjected to dust collection, pulverized materials flow into a material storage box. The agricultural straw pulverizer is simple in structure and easy to operate; the working environment of the farmer can be improved, and the agricultural straw pulverizer has a great market.

The invention provides a stress-cracking-resistant halogen-free flame-retardant TPE (thermoplastic elastomer). The stress-cracking-resistant halogen-free flame-retardant TPE comprises, by weight, 15-50 parts of SEBS (styrene-ethylene-butene-styrene) rubber resin, 20-30 parts of softening plasticizers, 15-40 parts of flame retardants, 10-20 parts of polyphenyl ether resin, 0.1-10 parts of char forming resin, 5-15 parts of polypropylene resin and 2-5 parts of polyethylene resin. The stress-cracking-resistant halogen-free flame-retardant TPE has the advantages that partial polyphenyl ether resin is replaced by the char forming resin, accordingly, risks of environmental stress cracking of formed products can be greatly reduced, the halogen-free flame-retardant TPE formed products with merits of zero halogen, good flame-retardant property, excellent stress cracking resistance, easiness in processing and the like can be quickly manufactured by the aid of a method, and can be widely applied to high-grade earphone cables and other cable products such as data cables, technological steps are simple, and the stress-cracking-resistant halogen-free flame-retardant TPE is easy to implement and high in productivity.

The invention relates to anti-crease finishing agent for acrylamido cotton fabric, and a preparation method and application thereof. The anti-crease finishing agent is structurally characterized in that a molecule comprises two or more acrylamido, and is formed by performing a series of processes to compound containing two or more amino or imido and acryloyl chloride. The anti-crease finishing agent has a good anti-crease effect on cotton fabric, and by forming finishing liquor with alkaline agent, softening agent and surfactant to perform anti-crease finishing to cotton fabric, the anti-crease finishing agent can ensure that the creasy recovery angle is increased to more than 220 degrees from 150 to 155 degrees and the breaking strength is more than 85 percent. The anti-crease finishing agent can not produce formaldehyde, can perform crosslinking with cellulosic fiber through low temperature, and is convenient to synthesize and apply, and has a broad application prospect.

The invention relates to a dielectric fluid (5) for electrical discharge machining an electrically non-conductive material, characterised in that it is of an aqueous solution or an aqueous suspension of at least one carbonaceous substance.

The invention discloses a cotton field urea application method based on soil nitrogen balance, which specifically includes the following steps: (1) determining the total amount of nitrogen application in the whole growth period of cotton according to the target yield, and calculating the total amount of urea application according to the nitrogen content of urea (2) Apply urea three times during the whole growth period of cotton; (3) Take soil samples according to the S-shaped route before each fertilization, according to the principle of equal amount, random, and multi-point mixing. The present invention is based on soil nitrate nitrogen supply, cotton nutrient demand, and fertilizer yield response, and considers the full utilization of inorganic nitrogen in cotton field soil and soil fertility maintenance. The total amount of urea application is about 30% to 40% lower than that of conventional fertilization, which can improve The utilization rate of nitrogen fertilizer is 5-10 percentage points, which greatly improves economic benefits, does not harm crops, wastes resources, pollutes soil and groundwater sources, does not threaten farmland environment and human health, and can ensure environmental friendliness and sustainable agriculture.

The invention relates to glycidyl methacrylate (GMA) graft modified polyvinyl acetate-based reverse core-shell emulsion and a preparation method thereof, belonging to the technical field of emulsion adhesive. The GMA graft modified polyvinyl acetate-based reverse core-shell emulsion is mainly prepared from a first core layer monomer, a second core layer monomer, a shell layer monomer, a graft monomer, a composite emulsifier, an initiator, a pH buffering agent, deionized water and a functional monomer, wherein the first core layer monomer is vinyl acetate, the second core layer monomer is butylacrylate, the shell layer monomer is styrene, the graft monomer is maleic anhydride, the composite emulsifier is a mixture of PCA507 and PCA078, the initiator is ammonium persulfate, the pH buffer isNaHCO3, and the functional monomer is GMA. The raw materials used in the preparation method are cheap and easy to obtain; the prepared functional monomer GMA modified core-shell composite emulsion type adhesive is non-toxic, harmless and simple in production and use process, and can be directly used as water-based adhesive.

The invention discloses an ecological environment-friendly crop organic compound fertilizer. The ecological environment-friendly crop organic compound fertilizer is prepared from, by weight, 40-60 parts of fermented sheep manure, 20-25 parts of fermented mushroom bran, 10-22 parts of biogas residues, 8-20 parts of sawdust, 10-15 parts of antibiotic residues, 2-6 parts of microelements, 8-15 partsof humic acid, 8-16 parts of fish pond mud, 8-15 parts of bauxite, 4-10 parts of potassium tripolyphosphate and 5-15 parts of chestnut shell powder. The material source is wide, nutrients are comprehensive and balanced, and the ecological environment-friendly crop organic compound fertilizer has the advantages of being safe and environmentally friendly, is free of toxic and side effects, does notpollute the environment, does not threaten the human health, does not harm the natural enemy, is simple in production technology and has a certain loosening function for soil.

The invention discloses a method and equipment for realizing denitration in a solid-gas conversion furnace, belonging to the technical field of the boiler flue gas denitration. The method comprises the following steps: converting a solid-state denitration substance such as urea into a gas-state substance by virtue of a heating gasifying system; and spraying the gas-state denitration substance intoan in-furnace denitration region in a boiler to adequately mix the gas-state substance with to-be-treated flue gas for reaction. The urea is further heated to be gasified through heat of the boiler,and a temperature adjusting protection part connected with a second draught fan is utilized for adjusting the heating temperature in a gasifying region and protecting pipelines distributed in the boiler, so that the pipelines are not damaged and deformed due to the high temperature in the boiler; and the flue gas lower than 850 DEG C is denitrated in the boiler, so that compared with the prior art, the efficiency is remarkably improved, the denitration cost is lowered, and the environmental protection is promoted.

The invention discloses a sterilization agent and a washing machine chassis containing the sterilization agent and belongs to the technical field of sterilization of washing machines. The sterilization agent is a spherical body; the spherical body is composed of a plurality of particles with thin film coatings; and each particle is composed of a sterilization and disinfection substance and a slow-release carrier. The washing machine chassis comprises a chassis main body; the chassis main body is composed of an upper sheet and a lower sheet, which are overlapped; each of the upper sheet and the lower sheet is provided with a plurality of through holes; at least one sterilization box is arranged on the lower surface of the lower sheet; the sterilization box is a groove with an opening at the bottom; the sterilization box is internally provided with the sterilization agent; a cover is arranged at the opening of the sterilization box; and the cover is provided with a plurality of through holes. The sterilization agent disclosed by the invention has efficient, wide-spectrum and relatively safe disinfection effects and has killing effects on bacteria, viruses, fungi, spores and the like, and also has a certain killing effect on coccidian oocysts; and the sterilization agent is used on the washing machine chassis, avoids secondary pollution on clothes by a washing machine and is beneficial to health.

The invention discloses a preparation method of sauced ducks with low biogenic amine and nitrite content. The method is characterized by comprising the following steps: (1) preparing a sauced duck: 1) cleaning the surface of a slaughtered cherry valley duck with sterile water, immersing the cleaned cherry valley duck in a saline solution with the mass concentration of 10%, pickling the cherry valley duck at 4 DEG C for 2 hours, blanching the cherry valley duck in boiling water for 10-20 seconds, and marinating the cherry valley duck in marinade of which the weight is 3 times that of duck meat for 1-3 hours to obtain a common sauced duck; 2) soaking with a fresh-keeping solution: preparing a grape seed extract solution with the concentration of 100-300mg/kg from the grape seed extract with a saline solution with the mass concentration of 10%, soaking the common sauced duck in the grape seed extract solution, covering the common sauced duck with a fresh-keeping film for 30-40s, performing standing, performing draining, and performing vacuum packaging with a fresh-keeping bag so as to obtain the sauced duck with low biogenic amine and nitrite content. The method has the advantages of inhibiting the generation of biogenic amines and the growth of spoilage microorganisms in the marinated duck old brine, and prolonging the shelf life of food.

The invention provides a novel triploid syndrome detection kit. The novel triploid syndrome detection kit comprises a primer combination, a probe combination, PCR reaction liquid and Taq polymerase, the kit comprises DNA ligase, terminal transferase, dNTPs (deoxyribonucleoside triphosphates) and reaction buffer solution, the sequences of the primer combination are as shown in SEQ ID NO. 1 to SEQ ID NO. 10; the probe combination is a whole genome copy number abnormal probe. According to the invention, the fetus triploid syndrome is safely, noninvasively, accurately, quickly and economically detected from maternal peripheral blood in an ultra-early stage, and a PCR technology is adopted, so that the requirement on the pregnancy time of a pregnant woman is relatively short; the method has the advantages that a pregnant woman of 8-10 weeks can carry out ultra-early screening, the quantity demanded of samples is small, only 2mL of plasma samples are needed, the operation process is simple and rapid, the detection period is short, data analysis is visual and convenient, the cost is only half of that of an NGS method, and non-invasive prenatal ultra-early screening can be completed in a short time.

The invention discloses a dental self-adaptive dental elevator with an LED lighting function, which belongs to the technical field of oral medical instruments. The dental elevator disclosed by the invention has an effective lighting function which is not easy to block, so that the use of the dental elevator by medical staff can be greatly facilitated, and when the dental elevator is rotated to cause that the edge part of the dental elevator extrudes the teeth beside, the flexible sheet can be sunken into the adaptive adjusting groove to carry out adaptive adjustment, so that the pressure on the teeth beside is obviously reduced, andfurthermore, the patient can be prevented from suffering from unnecessary trauma; after the operation is finished, the flexible sheet can be recovered under the action of the elastic force of the spring, and through the combined arrangement of the linkage adjusting ball, the lamp turn-off switch, the linkage contact tube, the elastic sealing film and the like, when the medical staff rotates the dental elevator with excessive force, the elastic sealing film can trigger the lamp turn-off switch, the LED lamp in the lightened state is turned off, so that the medical staff is reminded of overlarge force for rotating the dental elevator, and the medical staff is promoted to properly reduce the force or adjust the operation.