529results about How to "Reduce volatile loss" patented technology

The invention relates to a method for preparing solventless unsaturated polyester-imide wire coating enamel. The method comprises preparation of unsaturated polyester-imide and processing of paint mixing, wherein the unsaturated polyester-imide is prepared by the following steps: first step, adding polylol, dibasic acid or estolide into a reaction kettle according to a mol ratio of 1.05-1.5:1; stirring and heating the mixture to a temperature of between 160 and 170 DEG C; preserving the heat for 0.5 to 2 hours; and slowly heating the mixture to a temperature of between 200 and 205 DEG C until the acid value is no less than 50 mg KOH / g; and second step, cooling the mixture to a temperature of between 110 and 120 DEG C, adding trimellitic anhydride and diamine with the mol ratio of 2:1, and preserving the heat at a temperature of between 130 and 150 DEG C until the material is transparent; and after 1 hour of heat preservation, slowly heating the material to a temperature of between 200 and 205 DEG C until the acid value is no less than 30 mg KOG / g. Machine winding dipped by the solventless resin has the advantages of small volatilization loss, high filling rate, few times of paint dipping, short baking time, strong binding power, excellent performance of electrical appliance, environmental pollution reduction, and the like.

The invention discloses a coated natural plant essential oil feed additive which mainly comprises the following components: 10-40 parts of plant essential oil compound, 30-60 parts of coating core material and 10-20 parts of coating wall material, wherein the plant essential oil compound is prepared by mixing 5-10 parts of cinnamon oil, 5-10 parts of origanum oil, 3-5 parts of clove oil, 3-5 parts of lemon grass oil and 3-5 parts of sweet orange oil according to certain proportions. The plant essential oil compound and the coating core material are sufficiently mixed and adsorbed; and the coating wall material is sprayed by a bottom-spraying fluidized bed coating machine, and then screening is performed to obtain the feed additive. The feed additive disclosed by the invention consists of natural plant essential oil, has the advantages of high safety and no drug resistance, can effectively replace antibiotics, and meets the development direction of healthy culture; and since the plant essential oil is subjected to low-temperature coating treatment, the adsorption effect of the feed raw materials on the plant essential oil is avoided, the stability of the using effect is enhanced, and the shelf life is prolonged. The additive can promote the animal growth, improve the feed conversion efficiency and reduce the disease incidence.

The invention relates to a method for producing water-soluble fertilizers, in particular to a method for producing the water-soluble fertilizers with biochemical humic acid. The method is characterized by including matrix fermentation, concentrated liquor preparation and finished product preparation: firstly, weighing prepared concentrated liquor; secondly, adding modifiers, heating and stirring the liquor in the whole process, controlling the temperature to range from 40 DEG C to 60 DEG C, and cooling the liquor to be below 30 DEG C after reaction to obtain the fertilizers; and thirdly, packaging the fertilizers. The mass ratio of the concentrated liquor, the modifiers and inorganic auxiliary materials is (55-80): (0.1-2): (20-45). The method is simple in manufacture, easy in operation and high in actionability, solves the problem of water solubility of organic fertilizers, provides nutrition, improves soil, prevents diseases and insect pests, and integrates the effects of fertilizer supplementation, bacterium resistance and disease resistance. The fertilizers have balanced nutrition, stable state and persistent fertilizer effects, crop yield can be remarkably improved, the quality of agricultural products is improved, and soil fertility is enhanced.

The invention belongs to the fertilizer field and discloses an effect-increasing loss-control agent for fertilizers and a preparation method thereof. The agent is composed of a nitrogen nitrification inhibitor, a biological fermentation compound amino acid, a soil conditioner, an active-layer-shaped phyllosilicate and a compound microelement, wherein the nitrogen nitrification inhibitor can control resolution drain of ammonium nitrogen; the biological fermentation compound amino acid can absorb ammoniacal nitrogen, reduce volatilization loss, and stimulate plant root growth and absorption and utilization of nutrients; the soil conditioner can free soil, increase granular structure of the soil, form a net structure with the active-layer-shaped phyllosilicate through and bridging to reduce fertilizer nutrient loss, absorb and exchange NH4+ and K+, and improve the breathability, water-retaining property and nutrient-retaining property of the soil, therefore the nutrient utilization is improved, the nitrogen loss is reduced, and the effectiveness of the nitrogenous fertilizer is improved. Potted plants and field fertilizer efficiency tests show that the agent can improve the fertilizer nutrient utilization remarkably and increase the volume and income of crops.

The invention relates to an environment-friendly safe solvent cleaning agent which specifically comprises the following components in parts by weight: 0-97 parts of C10-C12 alkanes, 3-100 parts of alcohol ether solvent, 0.00-0.01 part of antioxidant and 0.00-0.01 part of corrosion inhibitor. The environment-friendly safe solvent cleaning agent provided by the invention is narrow in boiling range and the distillation recovery rate of the environment-friendly safe solvent cleaning agent can be above 95%; the environment-friendly safe solvent cleaning agent is also high in clearing ability, and has strong cleaning ability for polar dirt and nonpolar dirt; especially, the environment-friendly safe solvent cleaning agent can be used for thoroughly cleaning various metal working fluids, and oil-based and water-based cutting fluids without any residual and corrosion on metals; moreover, the shortcoming that the previous hydrocarbon type cleaning agents are wide in boiling range and only capable of dissolving and cleaning the nonpolar dirt are overcome. The cleaning agent is perfect in balance of cleaning ability, safety, dryness and reproducibility.

The invention discloses an opal glass suitable for full electrofusion forming and a preparation process thereof. The opal glass is prepared by composing a batch mixture by mixing a base material, an auxiliary material and an additive and adopting a full electrofusion method at the temperature of 1480-1520 DEG C; and the components of the batch mixture comprise the following components expressed as oxides in percentage by weight: 68.0-71.0% of SiO2, 6.0-7.5% of Al2O3, 1.0-1.5% of CaO, 9.0-10.5% of Na2O, 3.0-4.0% of F-, 1.5-2.5% of ZnO, 3.5-5.0% of B2O3, 1.0-2.0% of BaO and 1.0-2.0% of K2O. The opal glass prepared by the process has thermal expansion coefficient alpha less than or equal to 7.8*10-6 / DEG C, saves the energy by 50 percent as compared with the transitional method, achieves the mohs hardness of 6.8, the thermal shock resistance more than 125 DEG C and the water resistance of a primary standard, has main performance indexes all achieving or exceeding the level of similar imported products, meets the requirements for environmental protection and health and is an ideal substitute of the transitional porcelain product.

The invention provides a soil conditioner which comprises the following components by weight percentage based on the dry basis, 70-90% of ammonibacteria sludge, 0.1-10% of active ingredients and 5-25% of accessory. The invention also provides a preparation method for the soil conditioner and an application. By ammoniating the soil, the invention increases the nutrient content of the soil conditioner and simultaneously turns the sludge and organic material which pollute or harm the environment into a resource, thus not only solving the handling problem of waste, improving the environment, recycling the waste and opening up a new approach to the raw material required by the production of the soil conditioner.

The invention provides a synergistic environment-friendly fertilizer aid. The synergistic environment-friendly fertilizer aid comprises the following components in percentage by weight: 20wt%-80wt% of biomass charcoal, 1wt%-10wt% of polymerization amino acid, 1wt%-15wt% of a soil structure conditioner, 0.2wt%-2wt% of a bioactivator, 0-10wt% of a slow release agent, 0-8wt% of compound trace elements, 0-10wt% of modified starch and 0-50wt% of modified attapulgite. The invention further provides a fertilizer containing the synergistic environment-friendly fertilizer aid. By virtue of the compounding of the components, the fertilizer aid has the efficacies of reducing heavy metal pollution, increasing the utilization rate of the fertilizer and improving soil.

The invention relates to an environmental protection and safety type hydrocarbon cleaning agent belonging to the field of chemical cleaning agents. The hydrocarbon cleaning agent comprises the following components by weight percent: 50-95 percent of C10H22 and 5-35 percent of C11H24. The hydrocarbon cleaning agent has extremely strong cleaning capacity, can thoroughly clean various sewages such as oil stains, water, dust, and the like, can be completely volatilized without any residues, has an ozone rupture coefficient of 0.00 and no harm to the human body and is the optimal choice for substituting for the Freon and halogenated hydrocarbon products having extremely great harm to the environment and human beings.

The invention discloses a treatment method for a polymetallic alloy formed by arsenic-lead-antimony and noble metal. In order that the polymetallic alloy formed by arsenic-lead-antimony and noble metal is directly prepared to meet the international standard Sb20399.8, the noble metal is enriched in the noble metal alloy. The treatment method comprises the following steps of: carrying out alkalification and deep dearsenification treatment on the polymetallic alloy formed by arsenic-lead-antimony and noble metal; then converting antimony white at low temperature in a special converting furnace; and finally blasting and highly oxidizing lead slagging to obtain the noble metal alloy. According to the treatment method, the antimony directly satisfies the output requirement of antimony white; the energy consumption is low, and the direct yield rate of the noble metal is improved to more than 98%; and the converting and slagging time of residual alloy after removal of arsenic and antimony is shortened within 30 hours, which is reduced by more than 50% compared with the conventional process.

The invention relates to a new technology for refining Fischer-Tropsch synthesis light fraction oil. The new technology comprises solid-phase adsorption, extraction refining, separation and extraction agent refining and a recycling unit. In the new technology for refining Fischer-Tropsch synthesis light fraction oil provided by the invention, Fischer-Tropsch synthesis light fraction oil is used as a raw material; metal ion impurities and oxygenated compounds in the Fischer-Tropsch synthesis light fraction oil are removed by the technology unit while the recycled refined extraction agent is circularly utilized. The new technology for refining Fischer-Tropsch synthesis light fraction oil provided by the invention has the advantages of simple process, high recycling efficiency, recycling and cyclic utilization of extraction agent, low cost of extraction agent, small investment, and the like.

The invention relates to a method for recovering oil gas and a device. Oil gas exhausted from an oil product storage device is firstly condensed; condensate is recovered; uncondensed gas phase enters an adsorption device for adsorption; after being in adsorption saturation, the adsorption device is regenerated by adopting a vacuum regeneration manner; and concentrated oil generated by vacuum regeneration is recycled to the oil product storage device. According to the method and the device, provided by the invention, the oil gas is recovered by combining the mode of returning the oil gas to the oil product storage device and an oil gas recovery technology, desorbed oil gas is returned to the gas-liquid balanced system of the oil product storage device, the partial pressure of the oil gas is increased, and the loss of an oil product, caused by evaporating, is fundamentally reduced. The method and the device, provided by the invention, have the characteristics of large operating flexibility, low energy consumption, small investment, no potential safety hazard, reachability in tail gas emission standards, and the like.

The invention discloses a paddy rice cultivation method of double-season mechanized straw returning to field. The method comprises following steps: mechanized crushing of straw returning to field, returning straw to fields, field growing management after returning straw to fields and disease and pest diseases control.The paddy rice cultivation method of double-season mechanized straw returning to field has following beneficial effects: through an original-position full-amount returning mode, resources of double-season early rice and late rice can be reasonably utilized; straw is circularly utilized on the spot and workload is decreased; in addition, environmental contamination and hardened and impervious soil caused by burning of straw are avoided so that soil is improved and fertility betterment is achieved reasonably and soil fertility is improved; fertilizer applying amount is reduced and soil quality is improved; and the method is beneficial for stable and high-yield of double-season early rice and late rice.

The invention discloses a smoke solid essence and preparing method, which comprises the following steps: (1) adopting essence extract or essential oil as raw material; preparing essence or essence particle through spraying drying method; (2) condensing essence extract into grease or essential oil; adding 1-3 times 95% alcohol and fitful beta-cyclodextrin; stirring at constant temperature for 1-12h; drying to produce essence and essential particle; (3) selecting gelatin and acacia as wall material; adopting essence extract and essential oil as core material to prepare micro-capsule solid perfume or essence.

The invention relates to a solid-state fermentation method for ethanol production based on sweet sorghum stalks (including other sugar raw materials, such as, sugar beet, sugar cane, Jerusalem artichoke, etc) and a system, which pertains to the technical field of the processing of biomass liquid fuel. The method mainly includes the following key processes and core equipments: (1) smashed materials are fed into a tank with the help of the rotary motion of a cylinder body of a rotating drum type solid-state fermentation tank and the dual-function of the inclined angle of the tank body (1 to 15 degrees) and a feeding stirring board so as to be evenly mixed with the high-yield ethanol TSH-Sc-1 yeast liquid which is prayed from a sprayer; (2) the solid-state fermentation is carried out in the facultative oxygen environment, the fermentation tank is rotated at an even speed to promote the mixing of materials and the strengthening of heat transfer, thus the fermentation is always in a best condition and the fermentation time is shortened; (3) on-line monitoring is carried out: the solid-state fermentation is affected by a plurality of factors, such as, the distribution of the on-line regulation temperature of a computer, spray amount, the concentration of dissolved O2, filling factors, the mixing degree of the smashed materials and the yeast liquid, the pH value of yellow slurry, CO2 concentration, ethanol concentration, the migration of bacteria species and other parameters so as to ensure that the solid-state fermentation is carried out under a best working condition; (4) the automatic discharge of the fermentation material from the tank is realized with the help of the rotation of the tank body and the push of a discharging stirring board, and a closed tunnel belt is adopted for conveying the fermentation material to an ethanol-dreg separation unit.

The invention discloses a method for quantificationally detecting phenolic compounds in solid-state fermentation products and belongs to the technical field of analysis of solid-state fermentation products. The method is mainly suitable for determination of the content of phenolic compounds in solid-state fermentation products of liquor, wherein the phenolic compounds includes yeast for preparing hard liquor, fermented grains and cellar mud. The invention particularly relates to ultrasonic extraction, headspace solid-state-phase micro-extraction and gas chromatography-mass spectrogram combined qualitative and quantitative analysis of solid-state fermentation products. The method built by the invention can be used for quickly detecting 10 kinds of volatile phenolic compounds in the solid-state fermentation products; the phenolic compounds have a favorable linear relationship R2 is more than 0.99 within a detection range; all detection limits are less than 10microgramme / L; the relative standard deviation is less than 10%; and the recovery rate is 75%-110%. The technical scheme provided by the invention is simple, convenient and quick, can be used for achieving effective monitoring of the volatile phenolic compounds in the solid-state fermentation products, and has the great significance in improving the quality of final products.

The invention relates to a glass fiber production prescription, in particular to an environment-friendly alkaline-free glass fiber prescription emitting less toxic gas. The prescription is characterized in that the components include SiO2, Al2O3, B2O3, CaO, MgO, K2O and Na2O2. Compared with the E glass fiber widely applied presently, the glass fiber prepared with the prescription of the invention is improved as follows: the raw material containing floride which is most harmful is completely abandoned and the raw material containing volatile boron is largely reduced, but the glass fiber of the invention still remains similar electric performance and mechanical performance. The invention is characterized in that an alkaline-free glass fiber using blast furnace slag as one of the main raw materials, realizing reduction of operation difficulty and great reduction of exhaust emission is preferential and can be produced directly in large scale in a tank furnace including an electric boosting structure. The use of an industrial raw material easy for melting and clearing, namely, the blast furnace slag, ensures the glass fiber to have similar operating performance as the E glass fiber and to adapt to large-scale production under the existing E glass fiber tank furnace production technology.

The invention discloses an organic fertilizer for improving saline-alkali soil and a preparation method of the organic fertilizer. The organic fertilizer for improving the saline-alkali soil comprisesthe following ingredients in parts by weight: 30-38 parts of animal waste, 10-16 parts of plant straw, 8-12 parts of desulfurized gypsum, 6-10 parts of pulverized fuel ash, 5-7 parts of tea fluff, 4-6 parts of bagasse, 3-5 parts of waste tobacco material, 3-5 parts of seaweed meal, 2-4 parts of a pH regulator, 2-4 parts of mineral powder, and 1-3 parts of a deodorant and further comprises 1-3 parts by weight of a microbial agent and 0.01-0.03 part by weight of rooting powder. The organic fertilizer is prepared by granulating the animal waste, the plant straw, the desulfurized gypsum, the pulverized fuel ash, the tea fluff, the bagasse, the waste tobacco material, the seaweed meal, the pH regulator, the mineral powder, the deodorant, the microbial agent and the rooting powder. The organicfertilizer can effectively improve a soil structure of the saline-alkali soil and soil fertility, and reduce salinity and alkalinity; and when the organic fertilizer is matched with plant cultivation,the organic fertilizer further improves the water retaining capacity of the soil, avoids accumulation of salt in the surface soil, and can persistently and effectively improve the saline-alkali soiland change wasteland into fertile farmland after several cycles.

The invention belongs to the fertilizer field and discloses a fertilizer effect enhancement and invalidation control agent and a method for preparing the same. The fertilizer effect enhancement and invalidation control agent comprises a nitrogen stabilizer, a biosurfactant, a biological fermentation compound amino acid, a metal ion chelating agent, a soil structure modifier and water, wherein the nitrogen stabilizer can control nitration decomposition loss of ammonium nitrogen, the biological fermentation compound amino acid can absorb combination ammoniacal nitrogen and reduce volatilization loss, and the metal ion chelating agent can complex high valence metal ions in soil, reduce phosphorus immobilization, and activate phosphorus and potassium fixed in the soil, so that the phosphorus loss is reduced, and the validity of phosphate fertilizers is enhanced. The soil structure modifier can loosen the soil and increase granular structures of the soil, and the biosurfactant can promote nutrient absorption of plants and improve the nutrient utilization. Pot culture and field fertilizer effect experiments show that the fertilizer effect enhancement and invalidation control agent can improve the phosphorus utilization rate apparently, and volumes and incomes of crops are increased.

The invention discloses a technique to brew aromatic wine, based on traditional technique, which relates to reform and innovate to draw water, steam supplementary material, distill to obtain wine, and put dreg into cellar clear layered. Wherein, the said four steps are technical core; the cellar is constructed on bottom of pond near wall with inner wall fixed and cover on its head with center hole inserted hollow pipe; after putting dreg into cellar, sealing the pipe and cellar for fermentation; before putting out, stripping off the yellow mud to show pipe mouth, and taking out seal; inserting sucker to draw the yellow water in cellar by connected pump as possible as far; mixing, obtaining wine, storing in cellar; all processes with Zeng(traditional measuring tool) as unit. The method can decrease labor strength, save material, and increases wine quality.

The invention discloses a special rice fertilizer with both soil improvement and fertilizer efficiency functions for coastal saline soil and a preparation method and application of the special rice fertilizer. The special rice fertilizer comprises the following components in parts by mass: 35-40 parts of humic acid, 15-20 parts of fulvic acid, 20-25 parts of a composite fertilizer, 15-20 parts of a silicon calcium fertilizer, 1-1.5 parts of a urease inhibitor and 1-1.5 parts of a nitrification inhibitor. According to the invention, the application method combines soil culture, root system activation, crop nourishment and fertilizer efficiency improvement, so the rice fertilizer is low in cost, stable in effect, applicable to mechanical operation, not only applicable to coastal intertidal zones, but also applicable to rice planting in saline-alkali soil in north China or even northwest inland.

The invention discloses a methanol diesel fuel complex additive and a preparation method thereof. The complex additive is prepared from the following raw materials in parts by volume: 1-4 parts of diethyl phthalate, 1-8 parts of n-butylamine, 1-9 parts of isooctanol, 1-6 parts of cyclohexanone, 13-42 parts of lauryl methacrylate, 7-30 parts of mixed fatty glyceride, 1-5 parts of phenyl propargyl ether, 1-8 parts of dihexadecyl dimethyl ammonium chloride, 2-12 parts of ethyl formate, 2-14 parts of isooctyl nitrate and 1-6 parts of polyoxyethylene hexadeeylalkyl ether selies. The methanol diesel fuel complex additive can enable methanol diesel fuel to be evenly mixed and to be stably stored for more than 6 months, which effectively improves the fire behaviour of the methanol diesel fuel and inhibits the volatilization when the methanol content is higher; moreover, the production process is simple and the use is convenient, thereby being beneficial to the popularization and application of the methanol diesel fuel.

The invention relates to a method for dewatering triethylamine. The water- containing triethylamine is mixed with solution of base metal inorganic compound with its weight proportion being larger than 15% thoroughly, and gets triethylamine with water content being lower than 0.3% through separation. Said base matal inorganic compound comprises common salt compounds such as common salt or alkaline compounds such as caustic soda. The invention is characterized by simple process, good effect and suitability for industrial production. If the prepared triethylamine is treated with solid caustic soda and / or molecular screen, it can get higher- purity triethylamine with water content being 0.1%- 0.01%.

The invention relates to a method for applying fertilizer to a wheat and corn crop rotation system in dry farming saline-alkali areas and is used for improving fertilizer application benefit. The method comprises the following steps of: applying fertilizer to winter wheat, namely applying nitrogen fertilizer and phosphate fertilizer to the winter wheat according to the application amount of 6.9 to 8 kilograms of pure nitrogen (N) per acre and 5.5 to 12 kilograms of pure phosphorus pentoxide (P2O5) per acre respectively; and applying fertilizer to summer corns, namely applying nitrogen fertilizer and potassium fertilizer to the summer corns according to the application amount of 6.9 to 9 kilograms of pure N per acre and 6 to 9.5 kilograms of pure potassium oxide (K2O) per acre respectively. The method has the main advantages that: 1, fertilizer is applied according to different requirements of the winter wheat-summer corn on nutrients, so the fertilizer application pertinence is high and fertilizer application benefit is improved; 2, crops in each season are fertilized for one time, so labor of farmers and labor cost are reduced; 3, soil is prevented from being disturbed frequently, and water storage and soil moisture conservation are realized; and 4, the problems of volatilization loss in the fertilizer conversion process and pollution to atmospheric environment because the fertilizer is scattered on the ground surface are reduced.

The invention relates to a traditional medicine continuous circulate extracting concentrating method and relative device, wherein said device comprises drug extracting pot, solvent pot, and distill pot. The inventive method comprises that: adding extracting solvent into distill pot, heating, condensing via tube, flowing into extracting pot, immerging drug, reaching some level, adsorbing extracted liquid into distill pot, circulating until complete extraction; heating extracted liquid in distill pot, condensing solvent, guiding into one storage pot, entering into next process, and the solvent in storage pot can be extracted again. The invention concentrates after extraction, with high efficiency, reduced energy consumption and saved time, while the solvent can be saved more than 50%.

The invention discloses a preparation method of a hydrotreating catalyst, comprising the following steps: (1) preparing a carbon precursor and Group-VIB and / or Group-VIII active metal components into impregnation liquid; (2) dipping an inorganic refractory oxide support with the impregnation liquid obtained in step (1); and (3) carrying out thermal treatment on the porous inorganic refractory oxide support loaded with the carbon precursor and the active metal so that the carbon precursor is decomposed into carbon to obtain the carbon-containing catalyst. In the method, the carbon precursor isintroduced during the dipping process to prepare the carbon-containing catalyst, thus simplifying preparation process of the carbon-containing catalyst, improving service performances of the catalystand particularly enhancing activity and stability of the catalyst.

The invention belongs to the field of fertilizers and discloses a synergistic loss-control agent of nitrogenous fertilizers and a production method thereof. The synergistic loss-control agent is composed of a nitrogen stabilizer, a bio-surfactant, biological fermentation compound amino acid, a plant growth regulator, a soil structure modifier and water, wherein the nitrogen stabilizer can control nitration, decomposition and loss of ammonium nitrogen; the biological fermentation compound amino acid can absorb and chemically combine the ammonium nitrogen and reduce volatilization loss; plant growth regulator, the plant growth regulator can regulate plant growth and promote plants to absorb nitrogen, phosphor, potassium and microelements; the soil structure modifier can loosen soil and add granular structures of the soil; and the bio-surfactant can promote the plants to absorb nutrients and improve the utilization rate of the nutrients, therefore loss of phosphate is reduced, and effectiveness of the phosphate fertilizers is improved. Potting and field fertilizer efficiency tests show that the utilization rate of the phosphate can be improved obviously and the yield of crops and income can be increased through the synergistic loss-control agent.

The invention discloses a pollution-free paddy rice planting method. The method comprises the following steps: A, planting milk vetch as green manure in a rice field, and applying a basic manure, wherein 500-800 kg of the basic manure is applied to each mu of the rice field; B, after the rice field is subjected to exposure, performing rotary tillage, ridge separation, irrigation and rice transplanting; C, applying a compound fertilizer to seedlings after the seedlings are inserted; D, grazing 8-15 7-10-day-old ducks to each mu of the rice field after 15-20 days of rice transplanting, evicting the ducks from the rice field after 25-40 days, spraying a biological pesticide, draining for 7-10 days, topdressing 30-100 kg of the compound fertilizer used in the step C to each mu of the rice field, irrigating till the depth of water is 8-10 cm, grazing 5-10 7-10-day-old ducks to each mu of the rice field again, and evicting the ducks from the rice field before 15-20 days of rice mature. According to the pollution-free paddy rice planting method, the yield is high, pollution is avoided, produced rice tastes good, and meanwhile, high-quality duck is obtained.

The invention discloses a low-metal-loss smelting method of a copper alloy, which comprises the following steps: (1) adding all the raw materials except fusible and oxidable raw metals into a smelting furnace according to the components contained in the target alloy; after the raw materials are molten, introducing nitrogen or air into the smelting furnace, raising the pressure of the smelting furnace to 1-50 atm, and adding the low-melting raw metals into the smelting furnace; cooling the alloy melt, lowering the pressure of the hearth, and recovering valuable metals by using a micro reducing medium; using high-purity nitrogen, argon or carbon dioxide as a carrier gas, and adding a refining agent into the melt; introducing high-purity nitrogen or argon into the melt by using a rotary sprayer; adding a reducer-slag former mixture into the smelting furnace; and after removing all the furnace slag, adding a covering agent on the surface of the molten metal. The smelting method of the copper alloy can lower the metal loss, effectively remove impurity elements and gas inclusions in the alloy in the smelting process and enhance the refining effect.